1 files changed, 67 insertions, 0 deletions
diff --git a/java/com/google/gerrit/extensions/restapi/Url.java b/java/com/google/gerrit/extensions/restapi/Url.java
new file mode 100644
index 0000000000..9c69376eae
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+++ b/java/com/google/gerrit/extensions/restapi/Url.java
@@ -0,0 +1,67 @@
+// Copyright (C) 2012 The Android Open Source Project
+//
+// 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.gerrit.extensions.restapi;
+
+import static java.nio.charset.StandardCharsets.UTF_8;
+
+import java.io.UnsupportedEncodingException;
+import java.net.URLDecoder;
+import java.net.URLEncoder;
+
+/** URL related utility functions. */
+public final class Url {
+  /**
+   * Encode a path segment, escaping characters not valid for a URL.
+   *
+   * <p>The following characters are not escaped:
+   *
+   * <ul>
+   *   <li>{@code a..z, A..Z, 0..9}
+   *   <li>{@code . - * _}
+   * </ul>
+   *
+   * <p>' ' (space) is encoded as '+'.
+   *
+   * <p>All other characters (including '/') are converted to the triplet "%xy" where "xy" is the
+   * hex representation of the character in UTF-8.
+   *
+   * @param component a string containing text to encode.
+   * @return a string with all invalid URL characters escaped.
+   */
+  public static String encode(String component) {
+    if (component != null) {
+      try {
+        return URLEncoder.encode(component, UTF_8.name());
+      } catch (UnsupportedEncodingException e) {
+        throw new RuntimeException("JVM must support UTF-8", e);
+      }
+    }
+    return null;
+  }
+
+  /** Decode a URL encoded string, e.g. from {@code "%2F"} to {@code "/"}. */
+  public static String decode(String str) {
+    if (str != null) {
+      try {
+        return URLDecoder.decode(str, UTF_8.name());
+      } catch (UnsupportedEncodingException e) {
+        throw new RuntimeException("JVM must support UTF-8", e);
+      }
+    }
+    return null;
+  }
+
+  private Url() {}
+}