bbende commented on a change in pull request #4968: URL: https://github.com/apache/nifi/pull/4968#discussion_r610812401
########## File path: nifi-nar-bundles/nifi-single-user-iaa-providers-bundle/nifi-single-user-iaa-providers/src/main/java/org/apache/nifi/authorization/single/user/SingleUserAuthorizer.java ########## @@ -0,0 +1,142 @@ +/* + * 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.apache.nifi.authorization.single.user; + +import org.apache.nifi.authentication.single.user.SingleUserLoginIdentityProvider; +import org.apache.nifi.authorization.AuthorizationRequest; +import org.apache.nifi.authorization.AuthorizationResult; +import org.apache.nifi.authorization.Authorizer; +import org.apache.nifi.authorization.AuthorizerConfigurationContext; +import org.apache.nifi.authorization.AuthorizerInitializationContext; +import org.apache.nifi.authorization.annotation.AuthorizerContext; +import org.apache.nifi.authorization.exception.AuthorizationAccessException; +import org.apache.nifi.authorization.exception.AuthorizerCreationException; +import org.apache.nifi.util.NiFiProperties; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import javax.xml.stream.XMLEventReader; +import javax.xml.stream.XMLInputFactory; +import javax.xml.stream.XMLStreamException; +import javax.xml.stream.events.StartElement; +import javax.xml.stream.events.XMLEvent; +import java.io.File; +import java.io.FileInputStream; +import java.io.IOException; +import java.io.InputStream; + +/** + * Single User Authorizer requires Single User Login Identity Provider to be configured and authorizes all requests + */ +public class SingleUserAuthorizer implements Authorizer { + private static final Logger LOGGER = LoggerFactory.getLogger(SingleUserAuthorizer.class); + + private static final String REQUIRED_PROVIDER = SingleUserLoginIdentityProvider.class.getName(); + + private static final String IDENTIFIER_TAG = "identifier"; + + private static final String CLASS_TAG = "class"; + + /** + * Set NiFi Properties using method injection + * + * @param niFiProperties NiFi Properties + */ + @AuthorizerContext + public void setProperties(final NiFiProperties niFiProperties) { + final File configuration = niFiProperties.getLoginIdentityProviderConfigurationFile(); + final String identifier = niFiProperties.getProperty(NiFiProperties.SECURITY_USER_LOGIN_IDENTITY_PROVIDER); + if (isSingleUserLoginIdentityProviderConfigured(identifier, configuration)) { + LOGGER.debug("Required Login Identity Provider Configured [{}]", REQUIRED_PROVIDER); + } else { + final String message = String.format("%s requires %s to be configured", getClass().getSimpleName(), REQUIRED_PROVIDER); + throw new AuthorizerCreationException(message); + } + } + + @Override + public AuthorizationResult authorize(final AuthorizationRequest request) throws AuthorizationAccessException { + return AuthorizationResult.approved(); + } + + @Override + public void initialize(final AuthorizerInitializationContext initializationContext) { + LOGGER.info("Initializing Authorizer"); + } + + @Override + public void onConfigured(final AuthorizerConfigurationContext configurationContext) { + LOGGER.info("Configuring Authorizer"); + } + + @Override + public void preDestruction() { + LOGGER.info("Destroying Authorizer"); + } + + private boolean isSingleUserLoginIdentityProviderConfigured(final String configuredIdentifier, final File configuration) { + try (final InputStream inputStream = new FileInputStream(configuration)) { + final XMLEventReader reader = getProvidersReader(inputStream); + final boolean configured = isSingleUserLoginIdentityProviderConfigured(configuredIdentifier, reader); + reader.close(); + return configured; + } catch (final XMLStreamException | IOException e) { + throw new AuthorizerCreationException("Failed to read Login Identity Providers Configuration", e); + } + } + + private boolean isSingleUserLoginIdentityProviderConfigured(final String configuredIdentifier, final XMLEventReader reader) throws XMLStreamException { + boolean providerConfigured = false; + + boolean identifierFound = false; + while (reader.hasNext()) { + final XMLEvent event = reader.nextEvent(); + if (isStartElement(event, IDENTIFIER_TAG)) { + final String providerIdentifier = reader.getElementText().trim(); + identifierFound = configuredIdentifier.equals(providerIdentifier); Review comment: I was testing to see if start up failed when using the authorizer without the identity provider, and I happened to test it by commenting out the property in nifi.properties that specifies the identity provider identifier, which then caused this line to NPE. -- This is an automated message from the Apache Git Service. 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