Import code from internal repository to git

javatests/com/google/domain/registry/security/JsonHttpTestUtils.java

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+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed 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 com.google.domain.registry.security;
+
+import static com.google.common.base.Suppliers.memoize;
+import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth.assert_;
+import static com.google.domain.registry.security.JsonHttp.JSON_SAFETY_PREFIX;
+
+import com.google.common.base.Supplier;
+
+import org.json.simple.JSONValue;
+import org.json.simple.parser.ParseException;
+
+import java.io.BufferedReader;
+import java.io.StringReader;
+import java.io.StringWriter;
+import java.util.Map;
+
+/**
+ * Helper class for testing JSON RPC servlets.
+ */
+public final class JsonHttpTestUtils {
+
+  /** Returns JSON payload for mocked result of {@code rsp.getReader()}. */
+  public static BufferedReader createJsonPayload(Map<String, ?> object) {
+    return createJsonPayload(JSONValue.toJSONString(object));
+  }
+
+  /** @see #createJsonPayload(Map) */
+  public static BufferedReader createJsonPayload(String jsonText) {
+    return new BufferedReader(new StringReader(jsonText));
+  }
+
+  /**
+   * Returns JSON data parsed out of a JsonTransportServlet response stored in the given writer.
+   * If the data will be fetched multiple times, consider {@link #createJsonResponseSupplier}.
+   *
+   * <p>Example Mockito usage:<pre>  {@code
+   *
+   *   StringWriter writer = new StringWriter();
+   *   when(rsp.getWriter()).thenReturn(new PrintWriter(writer));
+   *   servlet.service(req, rsp);
+   *   assertThat(getJsonResponse(writer)).containsEntry("status", "SUCCESS");}</pre>
+   */
+  public static Map<String, Object> getJsonResponse(StringWriter writer) {
+    String jsonText = writer.toString();
+    assertThat(jsonText).startsWith(JSON_SAFETY_PREFIX);
+    jsonText = jsonText.substring(JSON_SAFETY_PREFIX.length());
+    try {
+      @SuppressWarnings("unchecked")
+      Map<String, Object> json = (Map<String, Object>) JSONValue.parseWithException(jsonText);
+      return json;
+    } catch (ClassCastException | ParseException e) {
+      assert_().fail("Bad JSON: %s\n%s", e.getMessage(), jsonText);
+      throw new AssertionError();
+    }
+  }
+
+  /**
+   * Returns a memoized supplier that'll provide the JSON response object of the tested servlet.
+   *
+   * <p>This works with Mockito as follows:<pre>   {@code
+   *
+   *   StringWriter writer = new StringWriter();
+   *   Supplier<Map<String, Object>> json = createJsonResponseSupplier(writer);
+   *   when(rsp.getWriter()).thenReturn(new PrintWriter(writer));
+   *   servlet.service(req, rsp);
+   *   assertThat(json.get()).containsEntry("status", "SUCCESS");}</pre>
+   */
+  public static Supplier<Map<String, Object>> createJsonResponseSupplier(
+      final StringWriter writer) {
+    return memoize(new Supplier<Map<String, Object>>() {
+      @Override
+      public Map<String, Object> get() {
+        return getJsonResponse(writer);
+      }});
+  }
+}