http://git-wip-us.apache.org/repos/asf/stratos/blob/b45ae00e/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/config/OAuthProperties.java
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a/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/config/OAuthProperties.java
 
b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/config/OAuthProperties.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jclouds.oauth.v2.config;
+
+/**
+ * Configurable properties for jclouds OAuth
+ */
+public class OAuthProperties {
+
+   /**
+    * The selected signature algorithm to use to sign the requests.
+    * <p/>
+    * This refers to the name the oauth provider expects, i.e., "RSA
+    */
+   public static final String SIGNATURE_OR_MAC_ALGORITHM = 
"jclouds.oauth.signature-or-mac-algorithm";
+
+   /**
+    * The oauth audience, who this token is intended for. For instance in JWT 
and for
+    * google API's this property maps to: 
{"aud","https://accounts.google.com/o/oauth2/token"}
+    *
+    * @see <a 
href="http://tools.ietf.org/html/draft-jones-json-web-token-04";>doc</a>
+    */
+   public static final String AUDIENCE = "jclouds.oauth.audience";
+
+   /**
+    * Optional list of comma-separated scopes to use when no OAuthScopes 
annotation is present.
+    */
+   public static final String SCOPES = "jclouds.oauth.scopes";
+
+   /**
+    * Specify if credentials are id + private key or if you are reusing an 
oauth2 token.
+    *
+    * @see org.jclouds.oauth.v2.config.CredentialType
+    */
+   public static final String CREDENTIAL_TYPE = 
"jclouds.oauth.credential-type";
+
+}

http://git-wip-us.apache.org/repos/asf/stratos/blob/b45ae00e/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/config/OAuthScopes.java
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b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/config/OAuthScopes.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jclouds.oauth.v2.config;
+
+import javax.inject.Qualifier;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Used to annotate REST methods/ifaces that use OAuthAuthentication.
+ * <p/>
+ * Sets the scopes for the token request for that particular method.
+ */
+@Retention(value = RetentionPolicy.RUNTIME)
+@Target(value = {ElementType.TYPE, ElementType.METHOD})
+@Qualifier
+public @interface OAuthScopes {
+
+   /**
+    * @return the OAuth scopes required to access the resource.
+    */
+   String[] value();
+
+}

http://git-wip-us.apache.org/repos/asf/stratos/blob/b45ae00e/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/domain/ClaimSet.java
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a/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/domain/ClaimSet.java
 
b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/domain/ClaimSet.java
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b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/domain/ClaimSet.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jclouds.oauth.v2.domain;
+
+import com.google.common.base.Objects;
+import com.google.common.base.Splitter;
+import com.google.common.collect.ForwardingMap;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Sets;
+
+import java.util.Map;
+import java.util.Set;
+
+import static com.google.common.base.Objects.ToStringHelper;
+import static com.google.common.base.Objects.equal;
+import static com.google.common.base.Objects.toStringHelper;
+import static com.google.common.base.Preconditions.checkNotNull;
+import static com.google.common.base.Preconditions.checkState;
+
+/**
+ * The claimset for the token.
+ *
+ * @see <a
+ *      href="https://developers.google.com/accounts/docs/OAuth2ServiceAccount";
+ *      >doc</a>
+ */
+public class ClaimSet extends ForwardingMap<String, String> {
+
+   public static Builder builder() {
+      return new Builder();
+   }
+
+   public Builder toBuilder() {
+      return builder().fromClaimSet(this);
+   }
+
+   public static class Builder {
+
+      private Set<String> requiredClaims;
+      private ImmutableMap.Builder<String, String> claims = new 
ImmutableMap.Builder<String, String>();
+      private long emissionTime;
+      private long expirationTime;
+
+      public Builder() {
+         this(ImmutableSet.<String>of());
+      }
+
+      /**
+       * Constructor that allows to predefine a mandatory set of claims as a 
comma-separated string, e.g, "iss,iat".
+       */
+      public Builder(String commaSeparatedRequiredClaims) {
+         
this(ImmutableSet.copyOf(Splitter.on(",").split(checkNotNull(commaSeparatedRequiredClaims))));
+      }
+
+      /**
+       * Constructor that allows to predefine a mandatory set of claims as a 
set of strings.
+       */
+      public Builder(Set<String> requiredClaims) {
+         this.requiredClaims = 
ImmutableSet.copyOf(checkNotNull(requiredClaims));
+      }
+
+      /**
+       * Adds a Claim, i.e. key/value pair, e.g., "scope":"all_permissions".
+       */
+      public Builder addClaim(String name, String value) {
+         claims.put(checkNotNull(name), checkNotNull(value, "value of %s", 
name));
+         return this;
+      }
+
+      /**
+       * @see ClaimSet#getEmissionTime()
+       */
+      public Builder emissionTime(long emmissionTime) {
+         this.emissionTime = emmissionTime;
+         return this;
+      }
+
+      /**
+       * @see ClaimSet#getExpirationTime()
+       */
+      public Builder expirationTime(long expirationTime) {
+         this.expirationTime = expirationTime;
+         return this;
+      }
+
+      /**
+       * Adds a map containing multiple claims
+       */
+      public Builder addAllClaims(Map<String, String> claims) {
+         this.claims.putAll(checkNotNull(claims));
+         return this;
+      }
+
+      public ClaimSet build() {
+         Map<String, String> claimsMap = claims.build();
+         checkState(Sets.intersection(claimsMap.keySet(), 
requiredClaims).size() == requiredClaims.size(),
+                 "not all required claims were present");
+         if (expirationTime == 0) {
+            expirationTime = emissionTime + 3600;
+         }
+         return new ClaimSet(claimsMap, emissionTime, expirationTime);
+      }
+
+      public Builder fromClaimSet(ClaimSet claimSet) {
+         return new 
Builder().addAllClaims(claimSet.claims).expirationTime(expirationTime).emissionTime(emissionTime);
+      }
+   }
+
+   private final Map<String, String> claims;
+   private final long emissionTime;
+   private final long expirationTime;
+
+   private ClaimSet(Map<String, String> claims, long emissionTime, long 
expirationTime) {
+      this.claims = claims;
+      this.emissionTime = emissionTime;
+      this.expirationTime = expirationTime;
+   }
+
+   /**
+    * The emission time, in seconds since the epoch.
+    */
+   public long getEmissionTime() {
+      return emissionTime;
+   }
+
+   /**
+    * The expiration time, in seconds since the emission time.
+    */
+   public long getExpirationTime() {
+      return expirationTime;
+   }
+
+   /**
+    * @returns the claims.
+    */
+   @Override
+   protected Map<String, String> delegate() {
+      return claims;
+   }
+
+   /**
+    * {@inheritDoc}
+    */
+   @Override
+   public int hashCode() {
+      return Objects.hashCode(claims);
+   }
+
+   /**
+    * {@inheritDoc}
+    */
+   @Override
+   public boolean equals(Object obj) {
+      if (this == obj)
+         return true;
+      if (obj == null)
+         return false;
+      if (getClass() != obj.getClass())
+         return false;
+      ClaimSet other = (ClaimSet) obj;
+      return equal(claims, other.claims);
+   }
+
+   /**
+    * {@inheritDoc}
+    */
+   @Override
+   public String toString() {
+      return string().toString();
+   }
+
+   protected ToStringHelper string() {
+      return toStringHelper(this).omitNullValues().add("claims", claims)
+              .add("emissionTime", emissionTime).add("expirationTIme", 
expirationTime);
+   }
+}

http://git-wip-us.apache.org/repos/asf/stratos/blob/b45ae00e/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/domain/Header.java
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a/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/domain/Header.java
 
b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/domain/Header.java
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b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/domain/Header.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jclouds.oauth.v2.domain;
+
+import com.google.common.base.Objects;
+
+import static com.google.common.base.Objects.equal;
+import static com.google.common.base.Objects.toStringHelper;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * The header for the OAuth token, contains the signer algorithm's name and 
the type of the token
+ *
+ * @see <a 
href="https://developers.google.com/accounts/docs/OAuth2ServiceAccount";>doc</a>
+ */
+public class Header {
+
+   public static Builder builder() {
+      return new Builder();
+   }
+
+   public Builder toBuilder() {
+      return builder().fromHeader(this);
+   }
+
+   public static class Builder {
+
+      private String signerAlgorithm;
+      private String type;
+
+      /**
+       * @see Header#getSignerAlgorithm()
+       */
+      public Builder signerAlgorithm(String signerAlgorithm) {
+         this.signerAlgorithm = checkNotNull(signerAlgorithm);
+         return this;
+      }
+
+      /**
+       * @see Header#getType()
+       */
+      public Builder type(String type) {
+         this.type = checkNotNull(type);
+         return this;
+      }
+
+      public Header build() {
+         return new Header(signerAlgorithm, type);
+      }
+
+      public Builder fromHeader(Header header) {
+         return new 
Builder().signerAlgorithm(header.signerAlgorithm).type(header.type);
+      }
+   }
+
+   private final String signerAlgorithm;
+   private final String type;
+
+   protected Header(String signerAlgorithm, String type) {
+      this.signerAlgorithm = checkNotNull(signerAlgorithm);
+      this.type = checkNotNull(type);
+   }
+
+   /**
+    * The name of the algorithm used to compute the signature, e.g., "RS256"
+    */
+   public String getSignerAlgorithm() {
+      return signerAlgorithm;
+   }
+
+   /**
+    * The type of the token, e.g., "JWT"
+    */
+   public String getType() {
+      return type;
+   }
+
+   /**
+    * {@inheritDoc}
+    */
+   @Override
+   public boolean equals(Object obj) {
+      if (this == obj)
+         return true;
+      if (obj == null)
+         return false;
+      if (getClass() != obj.getClass())
+         return false;
+      Header other = (Header) obj;
+      return equal(this.signerAlgorithm, other.signerAlgorithm) && 
equal(this.type,
+              other.type);
+   }
+
+   /**
+    * {@inheritDoc}
+    */
+   @Override
+   public int hashCode() {
+      return Objects.hashCode(signerAlgorithm, type);
+   }
+
+   /**
+    * {@inheritDoc}
+    */
+   @Override
+   public String toString() {
+      return string().toString();
+   }
+
+   protected Objects.ToStringHelper string() {
+      return toStringHelper(this).omitNullValues().add("signerAlgorithm", 
signerAlgorithm)
+              .add("type", type);
+   }
+}

http://git-wip-us.apache.org/repos/asf/stratos/blob/b45ae00e/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/domain/OAuthCredentials.java
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b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/domain/OAuthCredentials.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jclouds.oauth.v2.domain;
+
+import com.google.common.base.Objects;
+import org.jclouds.domain.Credentials;
+
+import java.security.PrivateKey;
+
+import static com.google.common.base.Objects.equal;
+import static com.google.common.base.Objects.toStringHelper;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * Special kind credentials for oauth authentication that includes {@link 
java.security.PrivateKey} to sign
+ * requests.
+ */
+public class OAuthCredentials extends Credentials {
+
+   public static Builder builder() {
+      return new Builder();
+   }
+
+   public Builder toBuilder() {
+      return builder().fromOauthCredentials(this);
+   }
+
+   public static class Builder extends Credentials.Builder<OAuthCredentials> {
+
+      protected PrivateKey privateKey;
+
+      /**
+       * @see OAuthCredentials#privateKey
+       */
+      public Builder privateKey(PrivateKey privateKey) {
+         this.privateKey = checkNotNull(privateKey);
+         return this;
+      }
+
+      /**
+       * @see Credentials#identity
+       */
+      public Builder identity(String identity) {
+         this.identity = checkNotNull(identity);
+         return this;
+      }
+
+      /**
+       * @see Credentials#credential
+       */
+      public Builder credential(String credential) {
+         this.credential = credential;
+         return this;
+      }
+
+      public OAuthCredentials build() {
+         return new OAuthCredentials(checkNotNull(identity), credential, 
privateKey);
+      }
+
+      public Builder fromOauthCredentials(OAuthCredentials credentials) {
+         return new 
Builder().privateKey(credentials.privateKey).identity(credentials.identity)
+                 .credential(credentials.credential);
+      }
+   }
+
+   /**
+    * The private key associated with Credentials#identity.
+    * Used to sign token requests.
+    */
+   public final PrivateKey privateKey;
+
+   public OAuthCredentials(String identity, String credential, PrivateKey 
privateKey) {
+      super(identity, credential);
+      this.privateKey = privateKey;
+   }
+
+   /**
+    * {@inheritDoc}
+    */
+   @Override
+   public boolean equals(Object obj) {
+      if (this == obj)
+         return true;
+      if (obj == null)
+         return false;
+      if (getClass() != obj.getClass())
+         return false;
+      OAuthCredentials other = (OAuthCredentials) obj;
+      return equal(this.identity, other.identity) && equal(this.credential,
+              other.credential) && equal(this.privateKey,
+              other.privateKey);
+   }
+
+   /**
+    * {@inheritDoc}
+    */
+   @Override
+   public int hashCode() {
+      return Objects.hashCode(identity, credential, privateKey);
+   }
+
+   /**
+    * {@inheritDoc}
+    */
+   @Override
+   public String toString() {
+      return string().toString();
+   }
+
+   protected Objects.ToStringHelper string() {
+      return toStringHelper(this).omitNullValues().add("identity", identity)
+              .add("credential", credential != null ? credential.hashCode() : 
null).add("privateKey",
+                      privateKey.hashCode());
+   }
+}

http://git-wip-us.apache.org/repos/asf/stratos/blob/b45ae00e/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/domain/Token.java
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a/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/domain/Token.java
 
b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/domain/Token.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jclouds.oauth.v2.domain;
+
+import com.google.common.base.Objects;
+
+import java.beans.ConstructorProperties;
+
+import static com.google.common.base.Objects.equal;
+import static com.google.common.base.Objects.toStringHelper;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * The oauth token, obtained upon a successful token request and ready to 
embed in requests.
+ */
+public class Token {
+
+   public static Builder builder() {
+      return new Builder();
+   }
+
+   public Builder toBuilder() {
+      return builder().fromToken(this);
+   }
+
+   public static class Builder {
+
+      private String accessToken;
+      private String tokenType;
+      private long expiresIn;
+
+      /**
+       * @see Token#getAccessToken()
+       */
+      public Builder accessToken(String accessToken) {
+         this.accessToken = checkNotNull(accessToken);
+         return this;
+      }
+
+      /**
+       * @see Token#getTokenType()
+       */
+      public Builder tokenType(String tokenType) {
+         this.tokenType = checkNotNull(tokenType);
+         return this;
+      }
+
+      /**
+       * @see Token#getExpiresIn()
+       */
+      public Builder expiresIn(long expiresIn) {
+         this.expiresIn = expiresIn;
+         return this;
+      }
+
+      public Token build() {
+         return new Token(accessToken, tokenType, expiresIn);
+      }
+
+      public Builder fromToken(Token token) {
+         return new 
Builder().accessToken(token.accessToken).tokenType(token.tokenType).expiresIn(token.expiresIn);
+      }
+   }
+
+   private final String accessToken;
+   private final String tokenType;
+   private final long expiresIn;
+
+   @ConstructorProperties({"access_token", "token_type", "expires_in"})
+   protected Token(String accessToken, String tokenType, long expiresIn) {
+      this.accessToken = accessToken;
+      this.tokenType = tokenType;
+      this.expiresIn = expiresIn;
+   }
+
+   /**
+    * The access token obtained from the OAuth server.
+    */
+   public String getAccessToken() {
+      return accessToken;
+   }
+
+   /**
+    * The type of the token, e.g., "Bearer"
+    */
+   public String getTokenType() {
+      return tokenType;
+   }
+
+   /**
+    * In how many seconds this token expires.
+    */
+   public long getExpiresIn() {
+      return expiresIn;
+   }
+
+   /**
+    * {@inheritDoc}
+    */
+   @Override
+   public boolean equals(Object obj) {
+      if (this == obj)
+         return true;
+      if (obj == null)
+         return false;
+      if (getClass() != obj.getClass())
+         return false;
+      Token other = (Token) obj;
+      return equal(this.accessToken, other.accessToken) && 
equal(this.tokenType,
+              other.tokenType) && equal(this.expiresIn,
+              other.expiresIn);
+   }
+
+   /**
+    * {@inheritDoc}
+    */
+   @Override
+   public int hashCode() {
+      return Objects.hashCode(accessToken, tokenType, expiresIn);
+   }
+
+   /**
+    * {@inheritDoc}
+    */
+   @Override
+   public String toString() {
+      return string().toString();
+   }
+
+   protected Objects.ToStringHelper string() {
+      return toStringHelper(this).omitNullValues().add("accessToken", 
accessToken)
+              .add("tokenType", tokenType).add("expiresIn", expiresIn);
+   }
+
+}

http://git-wip-us.apache.org/repos/asf/stratos/blob/b45ae00e/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/domain/TokenRequest.java
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a/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/domain/TokenRequest.java
 
b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/domain/TokenRequest.java
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b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/domain/TokenRequest.java
@@ -0,0 +1,131 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jclouds.oauth.v2.domain;
+
+import com.google.common.base.Objects;
+
+import static com.google.common.base.Objects.equal;
+import static com.google.common.base.Objects.toStringHelper;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * A complete token request.
+ */
+public class TokenRequest {
+
+   public static Builder builder() {
+      return new Builder();
+   }
+
+   public Builder toBuilder() {
+      return builder().fromTokenRequest(this);
+   }
+
+   public static class Builder {
+      private Header header;
+      private ClaimSet claimSet;
+
+      /**
+       * @see TokenRequest#getClaimSet()
+       */
+      public Builder header(Header header) {
+         this.header = header;
+         return this;
+      }
+
+      /**
+       * @see TokenRequest#getHeader()
+       */
+      public Builder claimSet(ClaimSet claimSet) {
+         this.claimSet = claimSet;
+         return this;
+      }
+
+      public TokenRequest build() {
+         return new TokenRequest(header, claimSet);
+      }
+
+      public Builder fromTokenRequest(TokenRequest tokeRequest) {
+         return new 
Builder().header(tokeRequest.header).claimSet(tokeRequest.claimSet);
+      }
+   }
+
+   private final Header header;
+   private final ClaimSet claimSet;
+
+   public TokenRequest(Header header, ClaimSet claimSet) {
+      this.header = checkNotNull(header);
+      this.claimSet = checkNotNull(claimSet);
+   }
+
+   /**
+    * The header of this token request.
+    *
+    * @see Header
+    */
+   public Header getHeader() {
+      return header;
+   }
+
+   /**
+    * The claim set of this token request.
+    *
+    * @see ClaimSet
+    */
+   public ClaimSet getClaimSet() {
+      return claimSet;
+   }
+
+   /**
+    * {@inheritDoc}
+    */
+   @Override
+   public boolean equals(Object obj) {
+      if (this == obj)
+         return true;
+      if (obj == null)
+         return false;
+      if (getClass() != obj.getClass())
+         return false;
+      TokenRequest other = (TokenRequest) obj;
+      return equal(this.header, other.header) && equal(this.claimSet,
+              other.claimSet);
+   }
+
+   /**
+    * {@inheritDoc}
+    */
+   @Override
+   public int hashCode() {
+      return Objects.hashCode(header, claimSet);
+   }
+
+   /**
+    * {@inheritDoc}
+    */
+   @Override
+   public String toString() {
+      return string().toString();
+   }
+
+   protected Objects.ToStringHelper string() {
+      return toStringHelper(this).omitNullValues().add("header", header)
+              .add("claimSet", claimSet);
+   }
+
+
+}

http://git-wip-us.apache.org/repos/asf/stratos/blob/b45ae00e/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/domain/TokenRequestFormat.java
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b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/domain/TokenRequestFormat.java
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b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/domain/TokenRequestFormat.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jclouds.oauth.v2.domain;
+
+import com.google.inject.ImplementedBy;
+import org.jclouds.http.HttpRequest;
+import org.jclouds.oauth.v2.json.JWTTokenRequestFormat;
+
+import java.util.Set;
+
+/**
+ * Transforms a TokenRequest into a specific format (e.g. JWT token)
+ */
+@ImplementedBy(JWTTokenRequestFormat.class)
+public interface TokenRequestFormat {
+
+   /**
+    * Transforms the provided HttpRequest into a particular token request with 
a specific format.
+    */
+   <R extends HttpRequest> R formatRequest(R httpRequest, TokenRequest 
tokenRequest);
+
+   /**
+    * The name of the type of the token request, e.g., "JWT"
+    */
+   String getTypeName();
+
+   /**
+    * The claims that must be present in the token request for it to be valid.
+    */
+   Set<String> requiredClaims();
+}

http://git-wip-us.apache.org/repos/asf/stratos/blob/b45ae00e/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/filters/BearerTokenAuthenticator.java
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b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/filters/BearerTokenAuthenticator.java
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@@ -0,0 +1,41 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jclouds.oauth.v2.filters;
+
+import com.google.common.base.Supplier;
+import org.jclouds.http.HttpException;
+import org.jclouds.http.HttpRequest;
+import org.jclouds.oauth.v2.domain.OAuthCredentials;
+
+import javax.inject.Inject;
+import javax.inject.Singleton;
+
+@Singleton
+public class BearerTokenAuthenticator implements OAuthAuthenticationFilter {
+   private final Supplier<OAuthCredentials> creds;
+
+   @Inject
+   BearerTokenAuthenticator(final Supplier<OAuthCredentials> creds) {
+      this.creds = creds;
+   }
+
+   @Override
+   public HttpRequest filter(HttpRequest request) throws HttpException {
+      return request.toBuilder().addHeader("Authorization", String.format("%s 
%s",
+            "Bearer ", creds.get().credential)).build();
+   }
+}

http://git-wip-us.apache.org/repos/asf/stratos/blob/b45ae00e/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/filters/OAuthAuthenticationFilter.java
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diff --git 
a/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/filters/OAuthAuthenticationFilter.java
 
b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/filters/OAuthAuthenticationFilter.java
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b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/filters/OAuthAuthenticationFilter.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jclouds.oauth.v2.filters;
+
+import org.jclouds.http.HttpRequestFilter;
+
+/**
+ * Marker interface to specify auth mechanism (credentials or bearer token)
+ *
+ */
+public interface OAuthAuthenticationFilter extends HttpRequestFilter {
+
+}

http://git-wip-us.apache.org/repos/asf/stratos/blob/b45ae00e/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/filters/OAuthAuthenticator.java
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b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/filters/OAuthAuthenticator.java
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b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/filters/OAuthAuthenticator.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jclouds.oauth.v2.filters;
+
+import com.google.common.base.Function;
+import com.google.common.cache.LoadingCache;
+import org.jclouds.http.HttpException;
+import org.jclouds.http.HttpRequest;
+import org.jclouds.oauth.v2.domain.Token;
+import org.jclouds.oauth.v2.domain.TokenRequest;
+import org.jclouds.rest.internal.GeneratedHttpRequest;
+
+import javax.inject.Inject;
+import javax.inject.Singleton;
+
+import static com.google.common.base.Preconditions.checkState;
+
+/**
+ * To be used by client applications to embed an OAuth authentication in their 
REST requests.
+ * <p/>
+ * TODO when we're able to use the OAuthAuthentication an this should be used 
automatically
+ */
+@Singleton
+public class OAuthAuthenticator implements OAuthAuthenticationFilter {
+
+   private Function<GeneratedHttpRequest, TokenRequest> tokenRequestBuilder;
+   private Function<TokenRequest, Token> tokenFetcher;
+
+   @Inject
+   OAuthAuthenticator(Function<GeneratedHttpRequest, TokenRequest> 
tokenRequestBuilder, LoadingCache<TokenRequest,
+           Token> tokenFetcher) {
+      this.tokenRequestBuilder = tokenRequestBuilder;
+      this.tokenFetcher = tokenFetcher;
+   }
+
+   @Override
+   public HttpRequest filter(HttpRequest request) throws HttpException {
+      checkState(request instanceof GeneratedHttpRequest, "request must be an 
instance of GeneratedHttpRequest");
+      GeneratedHttpRequest generatedHttpRequest = 
GeneratedHttpRequest.class.cast(request);
+      TokenRequest tokenRequest = 
tokenRequestBuilder.apply(generatedHttpRequest);
+      Token token = tokenFetcher.apply(tokenRequest);
+      return request.toBuilder().addHeader("Authorization", String.format("%s 
%s",
+              token.getTokenType(), token.getAccessToken())).build();
+
+   }
+
+
+}

http://git-wip-us.apache.org/repos/asf/stratos/blob/b45ae00e/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/functions/BuildTokenRequest.java
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a/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/functions/BuildTokenRequest.java
 
b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/functions/BuildTokenRequest.java
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b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/functions/BuildTokenRequest.java
@@ -0,0 +1,135 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jclouds.oauth.v2.functions;
+
+import static com.google.common.base.Preconditions.checkState;
+import static org.jclouds.oauth.v2.OAuthConstants.ADDITIONAL_CLAIMS;
+import static org.jclouds.oauth.v2.config.OAuthProperties.AUDIENCE;
+import static org.jclouds.oauth.v2.config.OAuthProperties.SCOPES;
+import static 
org.jclouds.oauth.v2.config.OAuthProperties.SIGNATURE_OR_MAC_ALGORITHM;
+
+import java.util.Map;
+
+import javax.inject.Singleton;
+
+import org.jclouds.Constants;
+import org.jclouds.oauth.v2.config.OAuthScopes;
+import org.jclouds.oauth.v2.domain.ClaimSet;
+import org.jclouds.oauth.v2.domain.Header;
+import org.jclouds.oauth.v2.domain.OAuthCredentials;
+import org.jclouds.oauth.v2.domain.TokenRequest;
+import org.jclouds.oauth.v2.domain.TokenRequestFormat;
+import org.jclouds.rest.internal.GeneratedHttpRequest;
+
+import com.google.common.base.Function;
+import com.google.common.base.Joiner;
+import com.google.common.base.Supplier;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.reflect.Invokable;
+import com.google.inject.Inject;
+import com.google.inject.name.Named;
+
+/**
+ * The default authenticator.
+ * <p/>
+ * Builds the default token request with the following claims: 
iss,scope,aud,iat,exp.
+ * <p/>
+ * TODO scopes etc should come from the REST method and not from a global 
property
+ */
+@Singleton
+public class BuildTokenRequest implements Function<GeneratedHttpRequest, 
TokenRequest> {
+
+   private final String assertionTargetDescription;
+   private final String signatureAlgorithm;
+   private final TokenRequestFormat tokenRequestFormat;
+   private final Supplier<OAuthCredentials> credentialsSupplier;
+   private final long tokenDuration;
+
+   @Inject(optional = true)
+   @Named(ADDITIONAL_CLAIMS)
+   protected Map<String, String> additionalClaims = ImmutableMap.of();
+
+   @Inject(optional = true)
+   @Named(SCOPES)
+   protected String globalScopes = null;
+
+   // injectable so expect tests can override with a predictable value
+   @Inject(optional = true)
+   protected Supplier<Long> timeSourceMillisSinceEpoch = new Supplier<Long>() {
+      @Override
+      public Long get() {
+         return System.currentTimeMillis();
+      }
+   };
+   
+   @Inject
+   public BuildTokenRequest(@Named(AUDIENCE) String assertionTargetDescription,
+                            @Named(SIGNATURE_OR_MAC_ALGORITHM) String 
signatureAlgorithm,
+                            TokenRequestFormat tokenRequestFormat, 
Supplier<OAuthCredentials> credentialsSupplier,
+                            @Named(Constants.PROPERTY_SESSION_INTERVAL) long 
tokenDuration) {
+      this.assertionTargetDescription = assertionTargetDescription;
+      this.signatureAlgorithm = signatureAlgorithm;
+      this.tokenRequestFormat = tokenRequestFormat;
+      this.credentialsSupplier = credentialsSupplier;
+      this.tokenDuration = tokenDuration;
+   }
+
+   @Override
+   public TokenRequest apply(GeneratedHttpRequest request) {
+      long now = timeSourceMillisSinceEpoch.get() / 1000;
+
+      // fetch the token
+      Header header = new Header.Builder()
+              .signerAlgorithm(signatureAlgorithm)
+              .type(tokenRequestFormat.getTypeName())
+              .build();
+
+      ClaimSet claimSet = new 
ClaimSet.Builder(this.tokenRequestFormat.requiredClaims())
+              .addClaim("iss", credentialsSupplier.get().identity)
+              .addClaim("scope", getOAuthScopes(request))
+              .addClaim("aud", assertionTargetDescription)
+              .emissionTime(now)
+              .expirationTime(now + tokenDuration)
+              .addAllClaims(additionalClaims)
+              .build();
+
+      return new TokenRequest.Builder()
+              .header(header)
+              .claimSet(claimSet)
+              .build();
+   }
+
+   protected String getOAuthScopes(GeneratedHttpRequest request) {
+      Invokable<?, ?> invokable = request.getInvocation().getInvokable();
+      
+      OAuthScopes classScopes = 
invokable.getOwnerType().getRawType().getAnnotation(OAuthScopes.class);
+      OAuthScopes methodScopes = invokable.getAnnotation(OAuthScopes.class);
+
+      // if no annotations are present the rely on globally set scopes
+      if (classScopes == null && methodScopes == null) {
+         checkState(globalScopes != null, String.format("REST class or method 
should be annotated " +
+                 "with OAuthScopes specifying required permissions. 
Alternatively a global property " +
+                 "\"oauth.scopes\" may be set to define scopes globally. REST 
Class: %s, Method: %s",
+                 invokable.getOwnerType(),
+                 invokable.getName()));
+         return globalScopes;
+      }
+
+      OAuthScopes scopes = methodScopes != null ? methodScopes : classScopes;
+      return Joiner.on(",").join(scopes.value());
+   }
+}

http://git-wip-us.apache.org/repos/asf/stratos/blob/b45ae00e/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/functions/FetchToken.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jclouds.oauth.v2.functions;
+
+import com.google.common.base.Function;
+import org.jclouds.oauth.v2.OAuthApi;
+import org.jclouds.oauth.v2.domain.Token;
+import org.jclouds.oauth.v2.domain.TokenRequest;
+
+import javax.inject.Inject;
+import javax.inject.Singleton;
+
+@Singleton
+public class FetchToken implements Function<TokenRequest, Token> {
+
+   private OAuthApi oAuthApi;
+
+   @Inject
+   public FetchToken(OAuthApi oAuthApi) {
+      this.oAuthApi = oAuthApi;
+   }
+
+   @Override
+   public Token apply(TokenRequest input) {
+      return this.oAuthApi.authenticate(input);
+   }
+}

http://git-wip-us.apache.org/repos/asf/stratos/blob/b45ae00e/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/functions/OAuthCredentialsSupplier.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jclouds.oauth.v2.functions;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Charsets;
+import com.google.common.base.Supplier;
+import com.google.common.cache.CacheBuilder;
+import com.google.common.cache.CacheLoader;
+import com.google.common.cache.LoadingCache;
+import com.google.common.io.ByteSource;
+import com.google.common.util.concurrent.UncheckedExecutionException;
+import org.jclouds.domain.Credentials;
+import org.jclouds.location.Provider;
+import org.jclouds.oauth.v2.domain.OAuthCredentials;
+import org.jclouds.rest.AuthorizationException;
+
+import javax.inject.Inject;
+import javax.inject.Named;
+import javax.inject.Singleton;
+import java.io.IOException;
+import java.security.GeneralSecurityException;
+import java.security.KeyFactory;
+import java.security.PrivateKey;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+import static com.google.common.base.Throwables.propagate;
+import static java.lang.String.format;
+import static org.jclouds.crypto.Pems.privateKeySpec;
+import static org.jclouds.oauth.v2.OAuthConstants.NO_ALGORITHM;
+import static 
org.jclouds.oauth.v2.OAuthConstants.OAUTH_ALGORITHM_NAMES_TO_KEYFACTORY_ALGORITHM_NAMES;
+import static 
org.jclouds.oauth.v2.config.OAuthProperties.SIGNATURE_OR_MAC_ALGORITHM;
+import static org.jclouds.util.Throwables2.getFirstThrowableOfType;
+
+/**
+ * Loads {@link OAuthCredentials} from a pem private key using the KeyFactory 
obtained from the JWT Algorithm
+ * Name<->KeyFactory name mapping in OAuthConstants. The pem pk algorithm must 
match the KeyFactory algorithm.
+ *
+ * @see 
org.jclouds.oauth.v2.OAuthConstants#OAUTH_ALGORITHM_NAMES_TO_KEYFACTORY_ALGORITHM_NAMES
+ */
+@Singleton
+public class OAuthCredentialsSupplier implements Supplier<OAuthCredentials> {
+
+   private final Supplier<Credentials> creds;
+   private final LoadingCache<Credentials, OAuthCredentials> keyCache;
+
+   @Inject
+   public OAuthCredentialsSupplier(@Provider Supplier<Credentials> creds, 
OAuthCredentialsForCredentials loader,
+                                   @Named(SIGNATURE_OR_MAC_ALGORITHM) String 
signatureOrMacAlgorithm) {
+      this.creds = creds;
+      
checkArgument(OAUTH_ALGORITHM_NAMES_TO_KEYFACTORY_ALGORITHM_NAMES.containsKey(signatureOrMacAlgorithm),
+              format("No mapping for key factory for algorithm: %s", 
signatureOrMacAlgorithm));
+      // throw out the private key related to old credentials
+      this.keyCache = 
CacheBuilder.newBuilder().maximumSize(2).build(checkNotNull(loader, "loader"));
+   }
+
+   /**
+    * it is relatively expensive to extract a private key from a PEM. cache 
the relationship between current credentials
+    * so that the private key is only recalculated once.
+    */
+   @VisibleForTesting
+   static class OAuthCredentialsForCredentials extends 
CacheLoader<Credentials, OAuthCredentials> {
+      private final String keyFactoryAlgorithm;
+
+      @Inject
+      public OAuthCredentialsForCredentials(@Named(SIGNATURE_OR_MAC_ALGORITHM) 
String signatureOrMacAlgorithm) {
+         this.keyFactoryAlgorithm = 
OAUTH_ALGORITHM_NAMES_TO_KEYFACTORY_ALGORITHM_NAMES.get(checkNotNull(
+                 signatureOrMacAlgorithm, "signatureOrMacAlgorithm"));
+      }
+
+      @Override
+      public OAuthCredentials load(Credentials in) {
+         try {
+            String identity = in.identity;
+            String privateKeyInPemFormat = in.credential;
+            if (keyFactoryAlgorithm.equals(NO_ALGORITHM)) {
+               return new 
OAuthCredentials.Builder().identity(identity).credential(privateKeyInPemFormat).build();
+            }
+            KeyFactory keyFactory = 
KeyFactory.getInstance(keyFactoryAlgorithm);
+            PrivateKey privateKey = 
keyFactory.generatePrivate(privateKeySpec(ByteSource.wrap(
+               privateKeyInPemFormat.getBytes(Charsets.UTF_8))));
+            return new 
OAuthCredentials.Builder().identity(identity).credential(privateKeyInPemFormat)
+                    .privateKey(privateKey).build();
+         } catch (IOException e) {
+            throw propagate(e);
+            // catch security exceptions InvalidKeySpecException and 
NoSuchAlgorithmException as GSE
+         } catch (GeneralSecurityException e) {
+            throw new AuthorizationException("security exception loading 
credentials. " + e.getMessage(), e);
+            // catch IAE that is thrown when parsing the pk fails
+         } catch (IllegalArgumentException e) {
+            throw new AuthorizationException("cannot parse pk. " + 
e.getMessage(), e);
+         }
+      }
+   }
+
+   @Override
+   public OAuthCredentials get() {
+      try {
+         // loader always throws UncheckedExecutionException so no point in 
using get()
+         return keyCache.getUnchecked(checkNotNull(creds.get(), "credential 
supplier returned null"));
+      } catch (UncheckedExecutionException e) {
+         Throwable authorizationException = getFirstThrowableOfType(e, 
AuthorizationException.class);
+         if (authorizationException != null) {
+            throw (AuthorizationException) authorizationException;
+         }
+         throw propagate(e);
+      }
+   }
+
+}

http://git-wip-us.apache.org/repos/asf/stratos/blob/b45ae00e/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/functions/SignOrProduceMacForToken.java
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diff --git 
a/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/functions/SignOrProduceMacForToken.java
 
b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/functions/SignOrProduceMacForToken.java
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b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/functions/SignOrProduceMacForToken.java
@@ -0,0 +1,119 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jclouds.oauth.v2.functions;
+
+import com.google.common.base.Function;
+import com.google.common.base.Supplier;
+import com.google.common.base.Throwables;
+import org.jclouds.oauth.v2.domain.OAuthCredentials;
+
+import javax.annotation.PostConstruct;
+import javax.crypto.Mac;
+import javax.inject.Inject;
+import javax.inject.Named;
+import java.security.InvalidKeyException;
+import java.security.NoSuchAlgorithmException;
+import java.security.PrivateKey;
+import java.security.Signature;
+import java.security.SignatureException;
+
+import static com.google.common.base.Preconditions.checkState;
+import static java.lang.String.format;
+import static org.jclouds.oauth.v2.OAuthConstants.NO_ALGORITHM;
+import static 
org.jclouds.oauth.v2.OAuthConstants.OAUTH_ALGORITHM_NAMES_TO_SIGNATURE_ALGORITHM_NAMES;
+import static 
org.jclouds.oauth.v2.config.OAuthProperties.SIGNATURE_OR_MAC_ALGORITHM;
+
+/**
+ * Function that signs/produces mac's for  OAuth tokens, provided a {@link 
Signature} or a {@link Mac} algorithm and
+ * {@link PrivateKey}
+ */
+public class SignOrProduceMacForToken implements Function<byte[], byte[]> {
+
+   private final Supplier<OAuthCredentials> credentials;
+   private final String signatureOrMacAlgorithm;
+   private Function<byte[], byte[]> signatureOrMacFunction;
+
+
+   @Inject
+   public SignOrProduceMacForToken(@Named(SIGNATURE_OR_MAC_ALGORITHM) String 
signatureOrMacAlgorithm,
+                                   Supplier<OAuthCredentials> credentials) {
+      
checkState(OAUTH_ALGORITHM_NAMES_TO_SIGNATURE_ALGORITHM_NAMES.containsKey(signatureOrMacAlgorithm),
+              format("the signature algorithm %s is not supported", 
signatureOrMacAlgorithm));
+      this.signatureOrMacAlgorithm = 
OAUTH_ALGORITHM_NAMES_TO_SIGNATURE_ALGORITHM_NAMES.get(signatureOrMacAlgorithm);
+      this.credentials = credentials;
+   }
+
+   @PostConstruct
+   public void loadSignatureOrMacOrNone() throws InvalidKeyException, 
NoSuchAlgorithmException {
+      if (signatureOrMacAlgorithm.equals(NO_ALGORITHM)) {
+         this.signatureOrMacFunction = new Function<byte[], byte[]>() {
+            @Override
+            public byte[] apply(byte[] input) {
+               return null;
+            }
+         };
+      } else if (signatureOrMacAlgorithm.startsWith("SHA")) {
+         this.signatureOrMacFunction = new 
SignatureGenerator(signatureOrMacAlgorithm, credentials.get().privateKey);
+      } else {
+         this.signatureOrMacFunction = new 
MessageAuthenticationCodeGenerator(signatureOrMacAlgorithm,
+                 credentials.get().privateKey);
+      }
+   }
+
+   @Override
+   public byte[] apply(byte[] input) {
+      return signatureOrMacFunction.apply(input);
+   }
+
+   private static class MessageAuthenticationCodeGenerator implements 
Function<byte[], byte[]> {
+
+      private Mac mac;
+
+      private MessageAuthenticationCodeGenerator(String macAlgorithm, 
PrivateKey privateKey) throws
+              NoSuchAlgorithmException, InvalidKeyException {
+         this.mac = Mac.getInstance(macAlgorithm);
+         this.mac.init(privateKey);
+      }
+
+      @Override
+      public byte[] apply(byte[] input) {
+         this.mac.update(input);
+         return this.mac.doFinal();
+      }
+   }
+
+   private static class SignatureGenerator implements Function<byte[], byte[]> 
{
+
+      private Signature signature;
+
+      private SignatureGenerator(String signatureAlgorithm, PrivateKey 
privateKey) throws NoSuchAlgorithmException,
+              InvalidKeyException {
+         this.signature = Signature.getInstance(signatureAlgorithm);
+         this.signature.initSign(privateKey);
+      }
+
+      @Override
+      public byte[] apply(byte[] input) {
+         try {
+            signature.update(input);
+            return signature.sign();
+         } catch (SignatureException e) {
+            throw Throwables.propagate(e);
+         }
+      }
+   }
+}

http://git-wip-us.apache.org/repos/asf/stratos/blob/b45ae00e/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/handlers/OAuthErrorHandler.java
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b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/handlers/OAuthErrorHandler.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jclouds.oauth.v2.handlers;
+
+import org.jclouds.http.HttpCommand;
+import org.jclouds.http.HttpErrorHandler;
+import org.jclouds.http.HttpResponse;
+import org.jclouds.http.HttpResponseException;
+import org.jclouds.rest.AuthorizationException;
+import org.jclouds.rest.ResourceNotFoundException;
+
+import javax.inject.Singleton;
+
+import static javax.ws.rs.core.Response.Status;
+import static org.jclouds.http.HttpUtils.closeClientButKeepContentStream;
+
+/**
+ * This will parse and set an appropriate exception on the command object.
+ */
+@Singleton
+public class OAuthErrorHandler implements HttpErrorHandler {
+   public void handleError(HttpCommand command, HttpResponse response) {
+      // it is important to always read fully and close streams
+      byte[] data = closeClientButKeepContentStream(response);
+      String message = data != null ? new String(data) : null;
+
+      Exception exception = message != null ? new 
HttpResponseException(command, response, message)
+              : new HttpResponseException(command, response);
+      message = message != null ? message : String.format("%s -> %s", 
command.getCurrentRequest().getRequestLine(),
+              response.getStatusLine());
+      Status status = Status.fromStatusCode(response.getStatusCode());
+      switch (status) {
+         case BAD_REQUEST:
+            break;
+         case UNAUTHORIZED:
+         case FORBIDDEN:
+            exception = new AuthorizationException(message, exception);
+            break;
+         case NOT_FOUND:
+            if (!command.getCurrentRequest().getMethod().equals("DELETE")) {
+               exception = new ResourceNotFoundException(message, exception);
+            }
+            break;
+         case CONFLICT:
+            exception = new IllegalStateException(message, exception);
+            break;
+      }
+      command.setException(exception);
+   }
+}

http://git-wip-us.apache.org/repos/asf/stratos/blob/b45ae00e/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/handlers/OAuthTokenBinder.java
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b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/handlers/OAuthTokenBinder.java
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b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/handlers/OAuthTokenBinder.java
@@ -0,0 +1,45 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jclouds.oauth.v2.handlers;
+
+import org.jclouds.http.HttpRequest;
+import org.jclouds.oauth.v2.domain.TokenRequest;
+import org.jclouds.oauth.v2.domain.TokenRequestFormat;
+import org.jclouds.rest.Binder;
+
+import javax.inject.Inject;
+import javax.inject.Singleton;
+
+/**
+ * Generic implementation of a token binder. Uses a provided {@link 
TokenRequestFormat} to actually bind tokens to
+ * requests.
+ */
+@Singleton
+public class OAuthTokenBinder implements Binder {
+
+   private final TokenRequestFormat tokenRequestFormat;
+
+   @Inject
+   OAuthTokenBinder(TokenRequestFormat tokenRequestFormat) {
+      this.tokenRequestFormat = tokenRequestFormat;
+   }
+
+   @Override
+   public <R extends HttpRequest> R bindToRequest(R request, Object input) {
+      return tokenRequestFormat.formatRequest(request, (TokenRequest) input);
+   }
+}

http://git-wip-us.apache.org/repos/asf/stratos/blob/b45ae00e/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/json/ClaimSetTypeAdapter.java
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a/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/json/ClaimSetTypeAdapter.java
 
b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/json/ClaimSetTypeAdapter.java
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b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/json/ClaimSetTypeAdapter.java
@@ -0,0 +1,59 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jclouds.oauth.v2.json;
+
+import com.google.gson.TypeAdapter;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonWriter;
+import org.jclouds.oauth.v2.domain.ClaimSet;
+
+import java.io.IOException;
+import java.util.Map;
+
+/**
+ * JSON TypeAdapter for the ClaimSet type. Pull the claims maps to the root 
level and adds two properties for the
+ * expiration time and issuing time.
+ */
+public class ClaimSetTypeAdapter extends TypeAdapter<ClaimSet> {
+
+   @Override
+   public void write(JsonWriter out, ClaimSet value) throws IOException {
+      out.beginObject();
+      for (Map.Entry<String, String> entry : value.entrySet()) {
+         out.name(entry.getKey());
+         out.value(entry.getValue());
+      }
+      out.name("exp");
+      out.value(value.getExpirationTime());
+      out.name("iat");
+      out.value(value.getEmissionTime());
+      out.endObject();
+   }
+
+   @Override
+   public ClaimSet read(JsonReader in) throws IOException {
+      ClaimSet.Builder builder = new ClaimSet.Builder();
+      in.beginObject();
+      while (in.hasNext()) {
+         String claimName = in.nextName();
+         String claimValue = in.nextString();
+         builder.addClaim(claimName, claimValue);
+      }
+      in.endObject();
+      return builder.build();
+   }
+}

http://git-wip-us.apache.org/repos/asf/stratos/blob/b45ae00e/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/json/HeaderTypeAdapter.java
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a/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/json/HeaderTypeAdapter.java
 
b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/json/HeaderTypeAdapter.java
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b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/json/HeaderTypeAdapter.java
@@ -0,0 +1,52 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jclouds.oauth.v2.json;
+
+import com.google.gson.TypeAdapter;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonWriter;
+import org.jclouds.oauth.v2.domain.Header;
+
+import java.io.IOException;
+
+/**
+ * JSON TypeAdapter for the Header type. Simply transforms the field names.
+ */
+public class HeaderTypeAdapter extends TypeAdapter<Header> {
+
+   @Override
+   public void write(JsonWriter out, Header value) throws IOException {
+      out.beginObject();
+      out.name("alg");
+      out.value(value.getSignerAlgorithm());
+      out.name("typ");
+      out.value(value.getType());
+      out.endObject();
+   }
+
+   @Override
+   public Header read(JsonReader in) throws IOException {
+      Header.Builder builder = new Header.Builder();
+      in.beginObject();
+      in.nextName();
+      builder.signerAlgorithm(in.nextString());
+      in.nextName();
+      builder.type(in.nextString());
+      in.endObject();
+      return builder.build();
+   }
+}

http://git-wip-us.apache.org/repos/asf/stratos/blob/b45ae00e/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/json/JWTTokenRequestFormat.java
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b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/java/org/jclouds/oauth/v2/json/JWTTokenRequestFormat.java
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@@ -0,0 +1,96 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jclouds.oauth.v2.json;
+
+import static com.google.common.base.Charsets.UTF_8;
+import static com.google.common.base.Joiner.on;
+import static com.google.common.io.BaseEncoding.base64Url;
+import static org.jclouds.io.Payloads.newUrlEncodedFormPayload;
+
+import java.util.Set;
+
+import javax.inject.Inject;
+import javax.inject.Singleton;
+
+import org.jclouds.http.HttpRequest;
+import org.jclouds.io.Payload;
+import org.jclouds.json.Json;
+import org.jclouds.oauth.v2.domain.TokenRequest;
+import org.jclouds.oauth.v2.domain.TokenRequestFormat;
+
+import com.google.common.base.Function;
+import com.google.common.collect.ImmutableMultimap;
+import com.google.common.collect.ImmutableSet;
+
+/**
+ * Formats a token request into JWT format namely:
+ * - transforms the token request to json
+ * - creates the base64 header.claimset portions of the payload.
+ * - uses the provided signer function to create a signature
+ * - creates the full url encoded payload as described in:
+ * https://developers.google.com/accounts/docs/OAuth2ServiceAccount
+ * <p/>
+ */
+@Singleton
+public class JWTTokenRequestFormat implements TokenRequestFormat {
+
+   private static final String ASSERTION_FORM_PARAM = "assertion";
+   private static final String GRANT_TYPE_FORM_PARAM = "grant_type";
+   private static final String GRANT_TYPE_JWT_BEARER = 
"urn:ietf:params:oauth:grant-type:jwt-bearer";
+
+   private final Function<byte[], byte[]> signer;
+   private final Json json;
+
+   @Inject
+   public JWTTokenRequestFormat(Function<byte[], byte[]> signer, Json json) {
+      this.signer = signer;
+      this.json = json;
+   }
+
+   @SuppressWarnings("unchecked")
+   @Override
+   public <R extends HttpRequest> R formatRequest(R request, TokenRequest 
tokenRequest) {
+
+      String encodedHeader = json.toJson(tokenRequest.getHeader());
+      String encodedClaimSet = json.toJson(tokenRequest.getClaimSet());
+
+      encodedHeader = 
base64Url().omitPadding().encode(encodedHeader.getBytes(UTF_8));
+      encodedClaimSet = 
base64Url().omitPadding().encode(encodedClaimSet.getBytes(UTF_8));
+
+      byte[] signature = signer.apply(on(".").join(encodedHeader, 
encodedClaimSet).getBytes(UTF_8));
+      String encodedSignature = signature != null ?  
base64Url().omitPadding().encode(signature) : "";
+
+      // the final assertion in base 64 encoded 
{header}.{claimSet}.{signature} format
+      String assertion = on(".").join(encodedHeader, encodedClaimSet, 
encodedSignature);
+      Payload payload = newUrlEncodedFormPayload(ImmutableMultimap.<String, 
String> builder()
+                           .put(GRANT_TYPE_FORM_PARAM, GRANT_TYPE_JWT_BEARER)
+                           .put(ASSERTION_FORM_PARAM, assertion).build());
+
+      return (R) request.toBuilder().payload(payload).build();
+   }
+
+   @Override
+   public String getTypeName() {
+      return "JWT";
+   }
+
+   @Override
+   public Set<String> requiredClaims() {
+      // exp and ist (expiration and emission times) are assumed mandatory 
already
+      return ImmutableSet.of("iss", "scope", "aud");
+   }
+}

http://git-wip-us.apache.org/repos/asf/stratos/blob/b45ae00e/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/resources/META-INF/services/org.jclouds.apis.ApiMetadata
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diff --git 
a/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/resources/META-INF/services/org.jclouds.apis.ApiMetadata
 
b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/resources/META-INF/services/org.jclouds.apis.ApiMetadata
new file mode 100644
index 0000000..ab2c67d
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b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/main/resources/META-INF/services/org.jclouds.apis.ApiMetadata
@@ -0,0 +1,19 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+org.jclouds.googlecomputeengine.GoogleComputeEngineApiMetadata
+org.jclouds.oauth.v2.OAuthApiMetadata

http://git-wip-us.apache.org/repos/asf/stratos/blob/b45ae00e/dependencies/jclouds/apis/gce/1.8.1-stratos/src/test/java/org/jclouds/googlecomputeengine/GoogleComputeEngineApiMetadataTest.java
----------------------------------------------------------------------
diff --git 
a/dependencies/jclouds/apis/gce/1.8.1-stratos/src/test/java/org/jclouds/googlecomputeengine/GoogleComputeEngineApiMetadataTest.java
 
b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/test/java/org/jclouds/googlecomputeengine/GoogleComputeEngineApiMetadataTest.java
new file mode 100644
index 0000000..5cb8a99
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b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/test/java/org/jclouds/googlecomputeengine/GoogleComputeEngineApiMetadataTest.java
@@ -0,0 +1,38 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jclouds.googlecomputeengine;
+
+import org.jclouds.View;
+import org.jclouds.apis.internal.BaseApiMetadataTest;
+import org.testng.annotations.Test;
+
+import com.google.common.collect.ImmutableSet;
+import com.google.common.reflect.TypeToken;
+
+/**
+ * Tests that GoogleComputeApiMetadata is properly registered in ServiceLoader
+ * <p/>
+ * <pre>
+ * META-INF/services/org.jclouds.apis.ApiMetadata
+ * </pre>
+ */
+@Test(groups = "unit", testName = "GoogleComputeApiMetadataTest")
+public class GoogleComputeEngineApiMetadataTest extends BaseApiMetadataTest {
+   public GoogleComputeEngineApiMetadataTest() {
+      super(new GoogleComputeEngineApiMetadata(), ImmutableSet.<TypeToken<? 
extends View>>of());
+   }
+}

http://git-wip-us.apache.org/repos/asf/stratos/blob/b45ae00e/dependencies/jclouds/apis/gce/1.8.1-stratos/src/test/java/org/jclouds/googlecomputeengine/GoogleComputeEngineAuthenticatedRestContextLiveTest.java
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diff --git 
a/dependencies/jclouds/apis/gce/1.8.1-stratos/src/test/java/org/jclouds/googlecomputeengine/GoogleComputeEngineAuthenticatedRestContextLiveTest.java
 
b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/test/java/org/jclouds/googlecomputeengine/GoogleComputeEngineAuthenticatedRestContextLiveTest.java
new file mode 100644
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b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/test/java/org/jclouds/googlecomputeengine/GoogleComputeEngineAuthenticatedRestContextLiveTest.java
@@ -0,0 +1,33 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jclouds.googlecomputeengine;
+
+import org.jclouds.oauth.v2.internal.BaseOAuthAuthenticatedApiLiveTest;
+import org.testng.annotations.Test;
+
+@Test(groups = "live")
+public class GoogleComputeEngineAuthenticatedRestContextLiveTest extends 
BaseOAuthAuthenticatedApiLiveTest<GoogleComputeEngineApi> {
+
+   public GoogleComputeEngineAuthenticatedRestContextLiveTest() {
+      provider = "google-compute-engine";
+   }
+
+   @Override
+   public String getScopes() {
+      return GoogleComputeEngineConstants.COMPUTE_SCOPE;
+   }
+}

http://git-wip-us.apache.org/repos/asf/stratos/blob/b45ae00e/dependencies/jclouds/apis/gce/1.8.1-stratos/src/test/java/org/jclouds/googlecomputeengine/PageSystemExpectTest.java
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diff --git 
a/dependencies/jclouds/apis/gce/1.8.1-stratos/src/test/java/org/jclouds/googlecomputeengine/PageSystemExpectTest.java
 
b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/test/java/org/jclouds/googlecomputeengine/PageSystemExpectTest.java
new file mode 100644
index 0000000..8fa44b9
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+++ 
b/dependencies/jclouds/apis/gce/1.8.1-stratos/src/test/java/org/jclouds/googlecomputeengine/PageSystemExpectTest.java
@@ -0,0 +1,114 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jclouds.googlecomputeengine;
+
+import static 
org.jclouds.googlecomputeengine.GoogleComputeEngineConstants.COMPUTE_READONLY_SCOPE;
+import static org.testng.Assert.assertSame;
+
+import org.jclouds.collect.IterableWithMarker;
+import org.jclouds.collect.PagedIterable;
+import org.jclouds.googlecomputeengine.domain.Image;
+import org.jclouds.googlecomputeengine.features.ImageApi;
+import 
org.jclouds.googlecomputeengine.internal.BaseGoogleComputeEngineApiExpectTest;
+import org.jclouds.googlecomputeengine.options.ListOptions;
+import org.jclouds.http.HttpRequest;
+import org.jclouds.http.HttpResponse;
+import org.testng.annotations.Test;
+
+/**
+ * A test specifically for the paging system. The code used is common to all 
list() methods so we're using Images
+ * but it could be anything else.
+ */
+@Test(groups = "unit")
+public class PageSystemExpectTest extends BaseGoogleComputeEngineApiExpectTest 
{
+
+   public void testGetSinglePage() {
+      HttpRequest list = HttpRequest
+              .builder()
+              .method("GET")
+              .endpoint("https://www.googleapis"; +
+                      ".com/compute/v1/projects/myproject/global/images")
+              .addHeader("Accept", "application/json")
+              .addHeader("Authorization", "Bearer " + TOKEN).build();
+
+      HttpResponse operationResponse = HttpResponse.builder().statusCode(200)
+              
.payload(payloadFromResource("/image_list_single_page.json")).build();
+
+      ImageApi imageApi = 
requestsSendResponses(requestForScopes(COMPUTE_READONLY_SCOPE),
+              TOKEN_RESPONSE, list, 
operationResponse).getImageApiForProject("myproject");
+
+      PagedIterable<Image> images = imageApi.list();
+
+      // expect one page
+      assertSame(images.size(), 1);
+      // with three images
+      assertSame(images.concat().size(), 3);
+   }
+
+   public void testGetMultiplePages() {
+      HttpRequest list1 = HttpRequest
+              .builder()
+              .method("GET")
+              .endpoint("https://www.googleapis"; +
+                      
".com/compute/v1/projects/myproject/global/images?maxResults=3")
+              .addHeader("Accept", "application/json")
+              .addHeader("Authorization", "Bearer " + TOKEN).build();
+
+      HttpRequest list2 = HttpRequest
+              .builder()
+              .method("GET")
+              .endpoint("https://www.googleapis"; +
+                      
".com/compute/v1/projects/myproject/global/images?pageToken" +
+                      
"=CgVJTUFHRRIbZ29vZ2xlLmNlbnRvcy02LTItdjIwMTIwNjIx&maxResults=3")
+              .addHeader("Accept", "application/json")
+              .addHeader("Authorization", "Bearer " + TOKEN).build();
+
+      HttpRequest list3 = HttpRequest
+              .builder()
+              .method("GET")
+              .endpoint("https://www.googleapis"; +
+                      
".com/compute/v1/projects/myproject/global/images?pageToken" +
+                      
"=CgVJTUFHRRIbZ29vZ2xlLmdjZWwtMTAtMDQtdjIwMTIxMTA2&maxResults=3")
+              .addHeader("Accept", "application/json")
+              .addHeader("Authorization", "Bearer " + TOKEN).build();
+
+      HttpResponse list1response = HttpResponse.builder().statusCode(200)
+              
.payload(payloadFromResource("/image_list_multiple_page_1.json")).build();
+
+      HttpResponse list2Response = HttpResponse.builder().statusCode(200)
+              
.payload(payloadFromResource("/image_list_multiple_page_2.json")).build();
+
+      HttpResponse list3Response = HttpResponse.builder().statusCode(200)
+              
.payload(payloadFromResource("/image_list_single_page.json")).build();
+
+
+      ImageApi imageApi = 
orderedRequestsSendResponses(requestForScopes(COMPUTE_READONLY_SCOPE),
+              TOKEN_RESPONSE, list1, list1response, list2, list2Response, 
list3, list3Response)
+              .getImageApiForProject("myproject");
+
+      PagedIterable<Image> images = imageApi.list(new 
ListOptions.Builder().maxResults(3));
+
+      int imageCounter = 0;
+      for (IterableWithMarker<Image> page : images) {
+         for (Image image : page) {
+            imageCounter++;
+         }
+      }
+      assertSame(imageCounter, 9);
+   }
+
+}

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