1 files changed, 240 insertions, 0 deletions
diff --git a/mailnews/base/prefs/content/accountcreation/fetchConfig.js b/mailnews/base/prefs/content/accountcreation/fetchConfig.js
new file mode 100644
index 000000000..07a9f5586
--- /dev/null
+++ b/mailnews/base/prefs/content/accountcreation/fetchConfig.js
@@ -0,0 +1,240 @@
+/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+/**
+ * Tries to find a configuration for this ISP on the local harddisk, in the
+ * application install directory's "isp" subdirectory.
+ * Params @see fetchConfigFromISP()
+ */
+
+Components.utils.import("resource:///modules/mailServices.js");
+Components.utils.import("resource://gre/modules/Services.jsm");
+Components.utils.import("resource://gre/modules/JXON.js");
+
+
+function fetchConfigFromDisk(domain, successCallback, errorCallback)
+{
+  return new TimeoutAbortable(runAsync(function()
+  {
+    try {
+      // <TB installdir>/isp/example.com.xml
+      var configLocation = Services.dirsvc.get("CurProcD", Ci.nsIFile);
+      configLocation.append("isp");
+      configLocation.append(sanitize.hostname(domain) + ".xml");
+
+      var contents =
+        readURLasUTF8(Services.io.newFileURI(configLocation));
+      let domParser = Cc["@mozilla.org/xmlextras/domparser;1"]
+                       .createInstance(Ci.nsIDOMParser);
+      successCallback(readFromXML(JXON.build(
+        domParser.parseFromString(contents, "text/xml"))));
+    } catch (e) { errorCallback(e); }
+  }));
+}
+
+/**
+ * Tries to get a configuration from the ISP / mail provider directly.
+ *
+ * Disclaimers:
+ * - To support domain hosters, we cannot use SSL. That means we
+ *   rely on insecure DNS and http, which means the results may be
+ *   forged when under attack. The same is true for guessConfig(), though.
+ *
+ * @param domain {String}   The domain part of the user's email address
+ * @param emailAddress {String}   The user's email address
+ * @param successCallback {Function(config {AccountConfig}})}   A callback that
+ *         will be called when we could retrieve a configuration.
+ *         The AccountConfig object will be passed in as first parameter.
+ * @param errorCallback {Function(ex)}   A callback that
+ *         will be called when we could not retrieve a configuration,
+ *         for whatever reason. This is expected (e.g. when there's no config
+ *         for this domain at this location),
+ *         so do not unconditionally show this to the user.
+ *         The first paramter will be an exception object or error string.
+ */
+function fetchConfigFromISP(domain, emailAddress, successCallback,
+                            errorCallback)
+{
+  if (!Services.prefs.getBoolPref(
+      "mailnews.auto_config.fetchFromISP.enabled")) {
+    errorCallback("ISP fetch disabled per user preference");
+    return;
+  }
+
+  let url1 = "http://autoconfig." + sanitize.hostname(domain) +
+             "/mail/config-v1.1.xml";
+  // .well-known/ <http://tools.ietf.org/html/draft-nottingham-site-meta-04>
+  let url2 = "http://" + sanitize.hostname(domain) +
+             "/.well-known/autoconfig/mail/config-v1.1.xml";
+  let sucAbortable = new SuccessiveAbortable();
+  var time = Date.now();
+  var urlArgs = { emailaddress: emailAddress };
+  if (!Services.prefs.getBoolPref(
+      "mailnews.auto_config.fetchFromISP.sendEmailAddress")) {
+    delete urlArgs.emailaddress;
+  }
+  let fetch1 = new FetchHTTP(url1, urlArgs, false,
+    function(result)
+    {
+      successCallback(readFromXML(result));
+    },
+    function(e1) // fetch1 failed
+    {
+      ddump("fetchisp 1 <" + url1 + "> took " + (Date.now() - time) +
+          "ms and failed with " + e1);
+      time = Date.now();
+      if (e1 instanceof CancelledException)
+      {
+        errorCallback(e1);
+        return;
+      }
+
+      let fetch2 = new FetchHTTP(url2, urlArgs, false,
+        function(result)
+        {
+          successCallback(readFromXML(result));
+        },
+        function(e2)
+        {
+          ddump("fetchisp 2 <" + url2 + "> took " + (Date.now() - time) +
+              "ms and failed with " + e2);
+          // return the error for the primary call,
+          // unless the fetch was cancelled
+          errorCallback(e2 instanceof CancelledException ? e2 : e1);
+        });
+      sucAbortable.current = fetch2;
+      fetch2.start();
+    });
+  sucAbortable.current = fetch1;
+  fetch1.start();
+  return sucAbortable;
+}
+
+/**
+ * Tries to get a configuration for this ISP from a central database at
+ * Mozilla servers.
+ * Params @see fetchConfigFromISP()
+ */
+
+function fetchConfigFromDB(domain, successCallback, errorCallback)
+{
+  let url = Services.prefs.getCharPref("mailnews.auto_config_url");
+  domain = sanitize.hostname(domain);
+
+  // If we don't specify a place to put the domain, put it at the end.
+  if (!url.includes("{{domain}}"))
+    url = url + domain;
+  else
+    url = url.replace("{{domain}}", domain);
+  url = url.replace("{{accounts}}", MailServices.accounts.accounts.length);
+
+  if (!url.length)
+    return errorCallback("no fetch url set");
+  let fetch = new FetchHTTP(url, null, false,
+                            function(result)
+                            {
+                              successCallback(readFromXML(result));
+                            },
+                            errorCallback);
+  fetch.start();
+  return fetch;
+}
+
+/**
+ * Does a lookup of DNS MX, to get the server who is responsible for
+ * recieving mail for this domain. Then it takes the domain of that
+ * server, and does another lookup (in ISPDB and possible at ISP autoconfig
+ * server) and if such a config is found, returns that.
+ *
+ * Disclaimers:
+ * - DNS is unprotected, meaning the results could be forged.
+ *   The same is true for fetchConfigFromISP() and guessConfig(), though.
+ * - DNS MX tells us the incoming server, not the mailbox (IMAP) server.
+ *   They are different. This mechnism is only an approximation
+ *   for hosted domains (yourname.com is served by mx.hoster.com and
+ *   therefore imap.hoster.com - that "therefore" is exactly the
+ *   conclusional jump we make here.) and alternative domains
+ *   (e.g. yahoo.de -> yahoo.com).
+ * - We make a look up for the base domain. E.g. if MX is
+ *   mx1.incoming.servers.hoster.com, we look up hoster.com.
+ *   Thanks to Services.eTLD, we also get bbc.co.uk right.
+ *
+ * Params @see fetchConfigFromISP()
+ */
+function fetchConfigForMX(domain, successCallback, errorCallback)
+{
+  domain = sanitize.hostname(domain);
+
+  var sucAbortable = new SuccessiveAbortable();
+  var time = Date.now();
+  sucAbortable.current = getMX(domain,
+    function(mxHostname) // success
+    {
+      ddump("getmx took " + (Date.now() - time) + "ms");
+      let sld = Services.eTLD.getBaseDomainFromHost(mxHostname);
+      ddump("base domain " + sld + " for " + mxHostname);
+      if (sld == domain)
+      {
+        errorCallback("MX lookup would be no different from domain");
+        return;
+      }
+      sucAbortable.current = fetchConfigFromDB(sld, successCallback,
+                                               errorCallback);
+    },
+    errorCallback);
+  return sucAbortable;
+}
+
+/**
+ * Queries the DNS MX for the domain
+ *
+ * The current implementation goes to a web service to do the
+ * DNS resolve for us, because Mozilla unfortunately has no implementation
+ * to do it. That's just a workaround. Once bug 545866 is fixed, we make
+ * the DNS query directly on the client. The API of this function should not
+ * change then.
+ *
+ * Returns (in successCallback) the hostname of the MX server.
+ * If there are several entires with different preference values,
+ * only the most preferred (i.e. those with the lowest value)
+ * is returned. If there are several most preferred servers (i.e.
+ * round robin), only one of them is returned.
+ *
+ * @param domain @see fetchConfigFromISP()
+ * @param successCallback {function(hostname {String})
+ *   Called when we found an MX for the domain.
+ *   For |hostname|, see description above.
+ * @param errorCallback @see fetchConfigFromISP()
+ * @returns @see fetchConfigFromISP()
+ */
+function getMX(domain, successCallback, errorCallback)
+{
+  domain = sanitize.hostname(domain);
+
+  let url = Services.prefs.getCharPref("mailnews.mx_service_url");
+  if (!url)
+    errorCallback("no URL for MX service configured");
+  url += domain;
+
+  let fetch = new FetchHTTP(url, null, false,
+    function(result)
+    {
+      // result is plain text, with one line per server.
+      // So just take the first line
+      ddump("MX query result: \n" + result + "(end)");
+      assert(typeof(result) == "string");
+      let first = result.split("\n")[0];
+      first.toLowerCase().replace(/[^a-z0-9\-_\.]*/g, "");
+      if (first.length == 0)
+      {
+        errorCallback("no MX found");
+        return;
+      }
+      successCallback(first);
+    },
+    errorCallback);
+  fetch.start();
+  return fetch;
+}