Add OAuth.deleteUserData method

Removes the user's oAuthId-to-uid mapping from Redis upon user deletion.
This fixes an issue where OAuth services could not link to a user if a
user account was deleted and then re-created.

library.js

@@ -232,5 +232,27 @@
 		});
 	};
 
+	OAuth.deleteUserData = function(uid) {
+		db.getObject('oAuthid:uid', function(err, oAuthData) {
+			if (err) {
+				winston.error('Could not fetch OAuthId data from Redis. Error: ' + 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);
+					}
+				});
+			}
+		});
+	};
+
 	module.exports = OAuth;
 }(module));

plugin.json

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