athrog commented on a change in pull request #120:
URL: https://github.com/apache/solr/pull/120#discussion_r666586850



##########
File path: 
solr/contrib/blob-repository/src/java/org/apache/solr/s3/AdobeMockS3StorageClient.java
##########
@@ -0,0 +1,79 @@
+/*
+ * 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.solr.s3;
+
+import com.amazonaws.client.builder.AwsClientBuilder;
+import com.amazonaws.regions.Regions;
+import com.amazonaws.services.s3.AmazonS3;
+import com.amazonaws.services.s3.AmazonS3ClientBuilder;
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Preconditions;
+import com.google.common.base.Strings;
+
+/**
+ * This storage client exists to work around some of the incongruencies Adobe 
S3Mock has with the S3 API.
+ * The main difference is that S3Mock does not support paths with a leading 
'/', but S3 does, and our code
+ * in {@link S3StorageClient} requires all paths to have a leading '/'.
+ */
+class AdobeMockS3StorageClient extends S3StorageClient {
+
+    static final int DEFAULT_MOCK_S3_PORT = 9090;
+    private static final String DEFAULT_MOCK_S3_ENDPOINT = "http://localhost:"; 
+ DEFAULT_MOCK_S3_PORT;
+
+    AdobeMockS3StorageClient(String bucketName) {
+        super(createInternalClient(), bucketName);
+    }
+
+    @VisibleForTesting
+    AdobeMockS3StorageClient(AmazonS3 s3client, String bucketName) {
+        super(s3client, bucketName);
+    }
+
+    private static AmazonS3 createInternalClient() {
+        String s3MockEndpoint = 
System.getenv().getOrDefault("MOCK_S3_ENDPOINT", DEFAULT_MOCK_S3_ENDPOINT);
+
+        return AmazonS3ClientBuilder.standard()
+            .enablePathStyleAccess()
+            .withEndpointConfiguration(new 
AwsClientBuilder.EndpointConfiguration(s3MockEndpoint, 
Regions.US_EAST_1.name()))
+            .build();
+    }
+
+    /**
+     * Ensures path adheres to some rules (different than the rules that S3 
cares about):
+     * -Trims leading slash, if given
+     * -If it's a file, throw an error if it ends with a trailing slash
+     */
+    @Override
+    String sanitizedPath(String path, boolean isFile) throws S3Exception {
+        Preconditions.checkArgument(!Strings.isNullOrEmpty(path));

Review comment:
       > pulling in Guava just for Preconditions
   
   Do you mean in this particular class? Or in general? I would definitely 
agree if we pulled Guava newly into Solr for just a few convenience functions, 
but as-is, it's already there on the classpath (same as Apache StringUtils)




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