Fix OAuth.deleteUserData to use filter hook

The action:user.create hook in NodeBB was recently changed to
filter.user:create, which allows the OAuth.deleteUserData method to remove
OAuth data for the user more directly.

library.js

@@ -9,6 +9,7 @@
 		path = module.parent.require('path'),
 		nconf = module.parent.require('nconf'),
 		winston = module.parent.require('winston'),
+		async = module.parent.require('async'),
 		passportOAuth;
 
 	var constants = Object.freeze({
@@ -232,25 +233,18 @@
 		});
 	};
 
-	OAuth.deleteUserData = function(uid) {
+	OAuth.deleteUserData = function(uid, callback) {
-		db.getObject('oAuthid:uid', function(err, oAuthData) {
+		async.waterfall([
+			async.apply(User.getUserField, uid, 'oAuthid'),
+			function(oAuthIdToDelete, next) {
+				db.deleteObjectField('oAuthid:uid', oAuthIdToDelete, next);
+			}
+		], function(err) {
 			if (err) {
-				winston.error('Could not fetch OAuthId data from Redis. Error: ' + err);
+				winston.error('Could not remove OAuthId data for uid ' + uid + '. Error: ' + err);
-			}
+				return callback(err);
-			var oAuthIdToDelete;
-			for (var oAuthId in oAuthData) {
-				if (oAuthData.hasOwnProperty(oAuthId) && oAuthData[oAuthId] === uid) {
-					oAuthIdToDelete = oAuthId;
-				}
-			}
-			if (typeof oAuthIdToDelete !== 'undefined') {
-				// Delete the oAuthId-to-uid mapping for the user
-				db.deleteObjectField('oAuthid:uid', oAuthIdToDelete, function(err, numDeletes) {
-					if (err) {
-						winston.error('Could not remove OAuthId data for uid ' + uid + '. Error: ' + err);
-					}
-				});
 			}
+			callback();
 		});
 	};
 

plugin.json

@@ -6,7 +6,7 @@
 	"library": "./library.js",
 	"hooks": [
 		{ "hook": "action:app.load", "method": "init" },
-		{ "hook": "action:user.delete", "method": "deleteUserData" },
+		{ "hook": "filter:user.delete", "method": "deleteUserData" },
 		{ "hook": "filter:auth.init", "method": "getStrategy" },
 		{ "hook": "filter:admin.header.build", "method": "addMenuItem" }
 	],