mv com/google/domain/registry google/registry

This change renames directories in preparation for the great package
rename. The repository is now in a broken state because the code
itself hasn't been updated. However this should ensure that git
correctly preserves history for each file.

java/google/registry/util/Idn.java

@@ -0,0 +1,78 @@
+// Copyright 2016 The Domain Registry Authors. 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.util;
+
+import com.google.common.base.Joiner;
+
+import com.ibm.icu.text.IDNA;
+import com.ibm.icu.text.IDNA.Info;
+
+/**
+ * A partial API-compatible replacement for {@link java.net.IDN} that replaces <a
+ * href="http://www.ietf.org/rfc/rfc3490.txt">IDNA2003</a> processing with <a
+ * href="http://unicode.org/reports/tr46/">UTS46 transitional processing</a>, with differences as
+ * described in the <a href="http://www.unicode.org/reports/tr46/#IDNAComparison">UTS46
+ * documentation</a>/
+ *
+ * <p>This class provides methods to convert internationalized domain names (IDNs) between Unicode
+ * and ASCII-only <a href="http://www.ietf.org/rfc/rfc3492.txt">Punycode</a> form. It implements the
+ * parts of the API from {@link java.net.IDN} that we care about, but will return different results
+ * as defined by the differences between IDNA2003 and transitional UTS46.
+ */
+public final class Idn {
+
+  /** Cached UTS46 with the flags we want. */
+  private static final IDNA UTS46_INSTANCE = IDNA.getUTS46Instance(IDNA.CHECK_BIDI);
+
+  /**
+   * Translates a string from Unicode to ASCII Compatible Encoding (ACE), as defined by the ToASCII
+   * operation of <a href="http://www.ietf.org/rfc/rfc3490.txt">RFC 3490</a>.
+   *
+   * <p>This method always uses <a href="http://unicode.org/reports/tr46/">UTS46 transitional
+   * processing</a>.
+   *
+   * @param name a domain name, which may include multiple labels separated by dots
+   * @throws IllegalArgumentException if the input string doesn't conform to RFC 3490 specification
+   * @see java.net.IDN#toASCII(String)
+   */
+  public static String toASCII(String name) {
+    Info info = new Info();
+    StringBuilder result = new StringBuilder();
+    UTS46_INSTANCE.nameToASCII(name, result, info);
+    if (info.hasErrors()) {
+      throw new IllegalArgumentException("Errors: " + Joiner.on(',').join(info.getErrors()));
+    }
+    return result.toString();
+  }
+
+  /**
+   * Translates a string from Unicode to ASCII Compatible Encoding (ACE), as defined by the ToASCII
+   * operation of <a href="http://www.ietf.org/rfc/rfc3490.txt">RFC 3490</a>.
+   *
+   * <p>This method always uses <a href="http://unicode.org/reports/tr46/">UTS46 transitional
+   * processing</a>.
+   *
+   * <p>ToUnicode never fails. In case of any error, the input string is returned unmodified.
+   *
+   * @param name a domain name, which may include multiple labels separated by dots
+   * @see java.net.IDN#toUnicode(String)
+   */
+  public static String toUnicode(String name) {
+    Info info = new Info();
+    StringBuilder result = new StringBuilder();
+    UTS46_INSTANCE.nameToUnicode(name, result, info);
+    return info.hasErrors() ? name : result.toString();
+  }
+}