1 files changed, 38 insertions, 0 deletions
diff --git a/comm/mailnews/compose/src/MailtoProtocolHandler.jsm b/comm/mailnews/compose/src/MailtoProtocolHandler.jsm
new file mode 100644
index 0000000000..a129e7d750
--- /dev/null
+++ b/comm/mailnews/compose/src/MailtoProtocolHandler.jsm
@@ -0,0 +1,38 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const EXPORTED_SYMBOLS = ["MailtoProtocolHandler"];
+
+/**
+ * Protocol handler for mailto: url.
+ *
+ * @implements {nsIProtocolHandler}
+ */
+class MailtoProtocolHandler {
+  QueryInterface = ChromeUtils.generateQI([Ci.nsIProtocolHandler]);
+
+  scheme = "mailto";
+  allowPort = false;
+
+  newChannel(uri, loadInfo) {
+    // Create an empty pipe to get an inputStream.
+    let pipe = Cc["@mozilla.org/pipe;1"].createInstance(Ci.nsIPipe);
+    pipe.init(true, true, 0, 0);
+    pipe.outputStream.close();
+
+    // Create a channel so that we can set contentType onto it.
+    let streamChannel = Cc[
+      "@mozilla.org/network/input-stream-channel;1"
+    ].createInstance(Ci.nsIInputStreamChannel);
+    streamChannel.setURI(uri);
+    streamChannel.contentStream = pipe.inputStream;
+
+    let channel = streamChannel.QueryInterface(Ci.nsIChannel);
+    // With this set, a nsIContentHandler instance will take over to open a
+    // compose window.
+    channel.contentType = "application/x-mailto";
+    channel.loadInfo = loadInfo;
+    return channel;
+  }
+}