Checks storage folder exists before creating account

Author: guillaumev

src/components/nsNextcloud.js

@@ -271,7 +271,15 @@ Nextcloud.prototype = {
 	createExistingAccount: function nsNc_createExistingAccount (aRequestObserver) {
 		// XXX: replace this with a better function
 		let successCb = function () {
-			aRequestObserver.onStopRequest(null, this, Cr.NS_OK);
+			let folderExists = function (exists) {
+        if (exists) {
+          aRequestObserver.onStopRequest(null, this, Cr.NS_OK);
+        }
+        else {
+          aRequestObserver.onStopRequest(null, this, Ci.nsIMsgCloudFileProvider.authErr);
+        }
+      }.bind(this);
+      this._checkFolderExists(folderExists);
 		}.bind(this);
 
 		let failureCb = function () {
@@ -586,6 +594,45 @@ Nextcloud.prototype = {
 		return quota && quota.length && Number(quota[0].textContent) || -1;
 	},
 
+	/**
+   * A private function that checks that the folder entered in the
+   * settings screen exists on the server.
+   *
+   * @param callback callback function called with true or false as an argument
+   */
+  _checkFolderExists: function nsOwncloud_checkFolderExists(callback) {
+    if (this._storageFolder !== '/') {
+      let body = '<propfind xmlns="DAV:">' +
+        '<prop>' +
+          '<resourcetype />' +
+        '</prop>' +
+      '</propfind>';
+
+      let req = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"]
+                  .createInstance(Ci.nsIXMLHttpRequest);
+
+      req.open("PROPFIND", this._serverUrl + kWebDavPath + ("/" + this._storageFolder + "/").replace(/\/+/g,'/'), true, this._userName, this._password);
+      req.onerror = function() {
+        this.log.info("failure checking folder");
+        callback(false);
+      }.bind(this);
+
+      req.onload = function() {
+        if (req.status === 207) {
+          return callback(true);
+        }
+        else {
+          return callback(false);
+        }
+      }.bind(this);
+
+      req.send(body);
+    }
+    else {
+      return callback(true);
+    }
+  },
+
 	/**
 	 * A private function that first ensures that the user is logged in, and then
 	 * retrieves the user's profile information.