Initial support for offline google oauth token

packages/accounts-google/google_client.js

@@ -19,18 +19,22 @@
     var scope = ['https://www.googleapis.com/auth/userinfo.email'];
     if (options && options.requestPermissions)
       scope = options.requestPermissions;
-    // Might be good to have a way to set access_type=offline. Need to
-    // both set it here and store the refresh token on the server.
     scope = _.union(scope, requiredScope);
     var flatScope = _.map(scope, encodeURIComponent).join('+');
 
+    var accessType = config.accessType;
+    if (!accessType) {
+      accessType = 'online';
+    }
+
     var loginUrl =
           'https://accounts.google.com/o/oauth2/auth' +
           '?response_type=code' +
           '&client_id=' + config.clientId +
           '&scope=' + flatScope +
           '&redirect_uri=' + Meteor.absoluteUrl('_oauth/google?close') +
-          '&state=' + state;
+          '&state=' + state +
+          '&access_type=' + accessType;
 
     Accounts.oauth.initiateLogin(state, loginUrl, callback);
   };

packages/accounts-google/google_configure.js

@@ -5,6 +5,7 @@ Template.configureLoginServiceDialogForGoogle.siteUrl = function () {
 Template.configureLoginServiceDialogForGoogle.fields = function () {
   return [
     {property: 'clientId', label: 'Client ID'},
-    {property: 'secret', label: 'Client secret'}
+    {property: 'secret', label: 'Client secret'},
+    {property: 'accessType', label: 'Access type (online or offline)'}
   ];
-};
+};

packages/accounts-google/google_server.js

@@ -2,17 +2,27 @@
 
   Accounts.oauth.registerService('google', 2, function(query) {
 
-    var accessToken = getAccessToken(query);
+    var response = getAccessToken(query);
+    var accessToken = response.access_token;
+    var refreshToken = response.refresh_token;
     var identity = getIdentity(accessToken);
 
+    if (!refreshToken) {
+
+        // Not all responses will include a refresh token, and we don't want to override an existing one with a null
+        // value if we actually already have one.
+        refreshToken = getRefreshToken(identity.id);
+    }
+
     return {
-      serviceData: {
-        id: identity.id,
-        accessToken: accessToken,
-        email: identity.email
-      },
-      options: {profile: {name: identity.name}}
-    };
+                serviceData: {
+                  id: identity.id,
+                  accessToken: accessToken,
+                  refreshToken: refreshToken,
+                  email: identity.email
+                },
+                options: {profile: {name: identity.name}}
+           };
   });
 
   var getAccessToken = function (query) {
@@ -33,9 +43,17 @@
       throw result.error;
     if (result.data.error) // if the http response was a json object with an error attribute
       throw result.data;
-    return result.data.access_token;
+    return result.data;
   };
 
+  var getRefreshToken = function (id) {
+      var user = Meteor.users.findOne({'services.google.id': id});
+      if (!user)
+        return null;
+
+      return user.services.google.refreshToken;
+    };
+
   var getIdentity = function (accessToken) {
     var result = Meteor.http.get(
       "https://www.googleapis.com/oauth2/v1/userinfo",