1 files changed, 105 insertions, 0 deletions
diff --git a/toolkit/modules/Http.jsm b/toolkit/modules/Http.jsm
new file mode 100644
index 0000000000..812da61baf
--- /dev/null
+++ b/toolkit/modules/Http.jsm
@@ -0,0 +1,105 @@
+/* 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 = ["httpRequest", "percentEncode"];
+
+// Strictly follow RFC 3986 when encoding URI components.
+// Accepts a unescaped string and returns the URI encoded string for use in
+// an HTTP request.
+function percentEncode(aString) {
+  return encodeURIComponent(aString)
+    .replace(/[!'()]/g, escape)
+    .replace(/\*/g, "%2A");
+}
+
+/*
+ * aOptions can have a variety of fields:
+ *  headers, an array of headers
+ *  postData, this can be:
+ *    a string: send it as is
+ *    an array of parameters: encode as form values
+ *    null/undefined: no POST data.
+ *  method, GET, POST or PUT (this is set automatically if postData exists).
+ *  onLoad, a function handle to call when the load is complete, it takes two
+ *          parameters: the responseText and the XHR object.
+ *  onError, a function handle to call when an error occcurs, it takes three
+ *          parameters: the error, the responseText and the XHR object.
+ *  logger, an object that implements the debug and log methods (e.g. log.jsm).
+ *
+ * Headers or post data are given as an array of arrays, for each each inner
+ * array the first value is the key and the second is the value, e.g.
+ *  [["key1", "value1"], ["key2", "value2"]].
+ */
+function httpRequest(aUrl, aOptions) {
+  let xhr = new XMLHttpRequest();
+  xhr.mozBackgroundRequest = true; // no error dialogs
+  xhr.open(aOptions.method || (aOptions.postData ? "POST" : "GET"), aUrl);
+  xhr.channel.loadFlags =
+    Ci.nsIChannel.LOAD_ANONYMOUS | // don't send cookies
+    Ci.nsIChannel.LOAD_BYPASS_CACHE |
+    Ci.nsIChannel.INHIBIT_CACHING;
+  xhr.onerror = function(aProgressEvent) {
+    if (aOptions.onError) {
+      // adapted from toolkit/mozapps/extensions/nsBlocklistService.js
+      let request = aProgressEvent.target;
+      let status;
+      try {
+        // may throw (local file or timeout)
+        status = request.status;
+      } catch (e) {
+        request = request.channel.QueryInterface(Ci.nsIRequest);
+        status = request.status;
+      }
+      // When status is 0 we don't have a valid channel.
+      let statusText = status ? request.statusText : "offline";
+      aOptions.onError(statusText, null, this);
+    }
+  };
+  xhr.onload = function(aRequest) {
+    try {
+      let target = aRequest.target;
+      if (aOptions.logger) {
+        aOptions.logger.debug("Received response: " + target.responseText);
+      }
+      if (target.status < 200 || target.status >= 300) {
+        let errorText = target.responseText;
+        if (!errorText || /<(ht|\?x)ml\b/i.test(errorText)) {
+          errorText = target.statusText;
+        }
+        throw new Error(target.status + " - " + errorText);
+      }
+      if (aOptions.onLoad) {
+        aOptions.onLoad(target.responseText, this);
+      }
+    } catch (e) {
+      if (aOptions.onError) {
+        aOptions.onError(e, aRequest.target.responseText, this);
+      }
+    }
+  };
+
+  if (aOptions.headers) {
+    aOptions.headers.forEach(function(header) {
+      xhr.setRequestHeader(header[0], header[1]);
+    });
+  }
+
+  // Handle adding postData as defined above.
+  let POSTData = aOptions.postData || null;
+  if (POSTData && Array.isArray(POSTData)) {
+    xhr.setRequestHeader(
+      "Content-Type",
+      "application/x-www-form-urlencoded; charset=utf-8"
+    );
+    POSTData = POSTData.map(p => p[0] + "=" + percentEncode(p[1])).join("&");
+  }
+
+  if (aOptions.logger) {
+    aOptions.logger.log(
+      "sending request to " + aUrl + " (POSTData = " + POSTData + ")"
+    );
+  }
+  xhr.send(POSTData);
+  return xhr;
+}