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diff --git a/mailnews/base/util/OAuth2Providers.jsm b/mailnews/base/util/OAuth2Providers.jsm
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+++ b/mailnews/base/util/OAuth2Providers.jsm
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+/* 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/. */
+
+/**
+ * Details of supported OAuth2 Providers.
+ */
+var EXPORTED_SYMBOLS = ["OAuth2Providers"];
+
+var {classes: Cc, interfaces: Ci, results: Cr, utils: Cu} = Components;
+
+// map of hostnames to [issuer, scope]
+var kHostnames = new Map([
+  ["imap.googlemail.com", ["accounts.google.com", "https://mail.google.com/"]],
+  ["smtp.googlemail.com", ["accounts.google.com", "https://mail.google.com/"]],
+  ["imap.gmail.com", ["accounts.google.com", "https://mail.google.com/"]],
+  ["smtp.gmail.com", ["accounts.google.com", "https://mail.google.com/"]],
+
+  ["imap.mail.ru", ["o2.mail.ru", "mail.imap"]],
+  ["smtp.mail.ru", ["o2.mail.ru", "mail.imap"]],
+]);
+
+// map of issuers to appKey, appSecret, authURI, tokenURI
+
+// For the moment, these details are hard-coded, since Google does not
+// provide dynamic client registration. Don't copy these values for your
+// own application--register it yourself. This code (and possibly even the
+// registration itself) will disappear when this is switched to dynamic
+// client registration.
+var kIssuers = new Map ([
+  ["accounts.google.com", [
+    '406964657835-aq8lmia8j95dhl1a2bvharmfk3t1hgqj.apps.googleusercontent.com',
+    'kSmqreRr0qwBWJgbf5Y-PjSU',
+    'https://accounts.google.com/o/oauth2/auth',
+    'https://www.googleapis.com/oauth2/v3/token'
+  ]],
+  ["o2.mail.ru", [
+    'thunderbird',
+    'I0dCAXrcaNFujaaY',
+    'https://o2.mail.ru/login',
+    'https://o2.mail.ru/token'
+  ]],
+]);
+
+/**
+ *  OAuth2Providers: Methods to lookup OAuth2 parameters for supported
+ *                   email providers.
+ */
+var OAuth2Providers = {
+
+  /**
+   * Map a hostname to the relevant issuer and scope.
+   *
+   * @param aHostname  String representing the url for an imap or smtp
+   *                   server (example "imap.googlemail.com").
+   *
+   * @returns          Array with [issuer, scope] for the hostname if found,
+   *                   else undefined. issuer is a string representing the
+   *                   organization, scope is an oauth parameter describing\
+   *                   the required access level.
+   */
+  getHostnameDetails: function (aHostname) { return kHostnames.get(aHostname);},
+
+  /**
+   * Map an issuer to OAuth2 account details.
+   *
+   * @param aIssuer    The organization issuing oauth2 parameters, example
+   *                   "accounts.google.com".
+   *
+   * @return           Array containing [appKey, appSecret, authURI, tokenURI]
+   *                   where appKey and appDetails are strings representing the
+   *                   account registered for Thunderbird with the organization,
+   *                   authURI and tokenURI are url strings representing
+   *                   endpoints to access OAuth2 authentication.
+   */
+  getIssuerDetails: function (aIssuer) { return kIssuers.get(aIssuer);}
+}