rdblue commented on a change in pull request #1573:
URL: https://github.com/apache/iceberg/pull/1573#discussion_r517029315



##########
File path: aws/src/main/java/org/apache/iceberg/aws/s3/S3URI.java
##########
@@ -0,0 +1,47 @@
+/*
+ * 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.iceberg.aws.s3;
+
+import java.net.URI;
+
+public class S3URI {
+  private final URI uri;
+
+  public S3URI(URI uri) {
+    this.uri = uri;
+  }
+
+  public S3URI(String uri) {
+    this(URI.create(uri));
+  }
+
+  public String bucket() {
+    return uri.getAuthority();
+  }
+
+  public String key() {
+    return uri.getPath().startsWith("/") ? uri.getPath().replaceFirst("/", "") 
: uri.getPath();

Review comment:
       Unfortunately, Java's `URI` has a lot of problems with character 
escaping. and it's really hard to reconstruct some or all of a URI from the 
getter methods that it exposes. The `uriToString` method that we use actually 
avoids calling `URI#toString` and instead uses `new Path(uri).toString()`.
   
   I think it would be better to parse the URI without it. Since we expect a 
bucket in the URI authority, we can be fairly strict with parsing rules:
   * Split by `://` to get scheme and bucket/key
   * Split bucket/key by the first `/` to get bucket and key
   * Validate scheme is s3 or equivalent (s3n, s3a)




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