Functions to create and manipulate x-callback-url URLs.

ios/chrome/common/x_callback_url.h

Index: ios/chrome/common/x_callback_url.h
diff --git a/ios/chrome/common/x_callback_url.h b/ios/chrome/common/x_callback_url.h
new file mode 100644
index 0000000000000000000000000000000000000000..5d7d53edc6845d50a988f986afb632bbab03eb3f
--- /dev/null
+++ b/ios/chrome/common/x_callback_url.h
@@ -0,0 +1,38 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef IOS_CHROME_COMMON_X_CALLBACK_URL_H_
+#define IOS_CHROME_COMMON_X_CALLBACK_URL_H_
+
+#include <map>
+#include <string>
+
+#include "base/strings/string_piece.h"
+#include "url/gurl.h"
+
+// Returns true if |url| is compliant with the x-callback-url specs.
+bool IsXCallbackURL(const GURL& url);
+
+// Returns a GURL compliant with the x-callback-url specs (simple version with
+// no parameters set, see XCallbackURLWithParameters for constructing complex
+// URLs).
+GURL CreateXCallbackURL(base::StringPiece scheme, base::StringPiece action);
+
+// Returns a GURL compliant with the x-callback-url specs.
+// See http://x-callback-url.com/specifications/ for specifications.
+// |scheme| must not be empty, all other parameters may be.
+GURL CreateXCallbackURLWithParameters(
+    base::StringPiece scheme,
+    base::StringPiece action,
+    const GURL& success_url,
+    const GURL& error_url,
+    const GURL& cancel_url,
+    const std::map<std::string, std::string>& parameters);
+
+// Extract query parameters from an x-callback-url URL. |x_callback_url| must
+// be compliant with the x-callback-url specs.
+std::map<std::string, std::string> ExtractQueryParametersFromXCallbackURL(
+    const GURL& x_callback_url);
+
+#endif  // IOS_CHROME_COMMON_X_CALLBACK_URL_H_