diff --git a/actions/auth0.js b/actions/auth0.js
new file mode 100644
index 000000000..a3aec90d5
--- /dev/null
+++ b/actions/auth0.js
@@ -0,0 +1,365 @@
+/*
+ * Copyright (C) 2014 TopCoder Inc., All Rights Reserved.
+ *
+ * @version 1.0
+ * @author TCSASSEMBLER
+ */
+"use strict";
+
+var async = require('async');
+var _ = require('underscore');
+var request = require('request');
+
+var IllegalArgumentError = require('../errors/IllegalArgumentError');
+var NotFoundError = require('../errors/NotFoundError');
+
+/**
+ * The login page.
+ */
+var LOGIN = "login";
+
+/**
+ * The register page.
+ */
+var REGISTER = "register";
+
+/**
+ * Set the name by provider id.
+ *
+ * @param resp - the json String
+ * @param socialAccount - the socialAccount instance
+ * @param helper - the helper instance
+ * @returns socialAccount - the socialAccount instance
+ */
+function setName(resp, socialAccount, helper) {
+    var providerId = socialAccount.providerId;
+
+    if (providerId === helper.socialProviders.twitter) {
+        socialAccount.name = resp.screen_name;
+    } else if (providerId === helper.socialProviders.github) {
+        socialAccount.name = resp.nickname;
+    } else if (providerId === helper.socialProviders.ad) {
+        socialAccount.name = resp.nickname;
+        socialAccount.enterpriseLogin = true;
+    } else {
+        socialAccount.name = '';
+    }
+
+    return socialAccount;
+}
+
+/**
+ * Parse the response json String to entity.
+ *
+ * @param resp - the response json String.
+ * @param helper - the helper instance
+ * @returns socialAccount - the parsed socialAccount instance.
+ */
+function parseUserInfo(resp, helper) {
+    //set the default value
+    var socialAccount = {
+        "name": '',
+        "email": '',
+        "givenName": '',
+        "familyName": '',
+        "emailVerified": false,
+        "providerId": 0,
+        "enterpriseLogin": false,
+        "socialUserId": '',
+        "jsonWebToken": '',
+        "accessToken": ''
+    };
+
+    if (_.isDefined(resp.identities) && resp.identities.length > 0) {
+        socialAccount.socialUserId = resp.identities[0].user_id;
+    }
+
+    helper.getProviderId(resp.user_id, function (tmp, providerId) {
+        socialAccount.providerId = providerId;
+    });
+    socialAccount = setName(resp, socialAccount, helper);
+
+    if (_.isDefined(resp.email)) {
+        socialAccount.email = resp.email;
+    }
+
+    if (_.isDefined(resp.email_verified)) {
+        socialAccount.emailVerified = resp.email_verified;
+    }
+
+    if (_.isDefined(resp.family_name)) {
+        socialAccount.familyName = resp.family_name;
+    }
+
+    if (_.isDefined(resp.given_name)) {
+        socialAccount.givenName = resp.given_name;
+    }
+
+    return socialAccount;
+}
+
+/**
+ * The method that exposes the auth0 Callback API.
+ */
+exports.action = {
+    name: 'auth0Callback',
+    description: 'The Auth0 Callback Method',
+    inputs : {
+        required : ['code'],
+        optional : ['state']
+    },
+    blockedConnectionTypes: [],
+    outputExample: {},
+    version: 'v2',
+    transaction: 'write',
+    databases: ["common_oltp"],
+    run: function (api, connection, next) {
+        var helper = api.helper, code = connection.params.code, state = connection.params.state,
+            dbConnectionMap = connection.dbConnectionMap, sqlParams = {}, accessToken, idToken, responseResult = {},
+            socialAccount, foundUserId = '', nextPage = '';
+
+        api.log("Executing auth0Callback#run", 'debug');
+        api.log("code: " + code, 'debug');
+        api.log("state: " + state, 'debug');
+
+        if (!connection.dbConnectionMap) {
+            api.helper.handleNoConnection(api, connection, next);
+            return;
+        }
+
+        async.waterfall([
+            function (cb) {
+                if (_.isDefined(state)) {
+                    var urls = state.split("?"), np, params;
+                    if (urls.length > 1) {
+                        np = decodeURI(urls[0]);
+                        params = urls[1].split("&");
+                        if (params.length > 1) {
+                            nextPage = np;
+                        } else {
+                            nextPage = decodeURI(state);
+                        }
+                    } else {
+                        nextPage = decodeURI(state);
+                    }
+                    responseResult.state = state;
+                }
+                responseResult.code = code;
+
+                cb();
+            }, function (cb) {
+                //get access token from auth0
+                request.post("https://" + api.config.general.oauthDomain + ".auth0.com/oauth/token", function (err, res, body) {
+                    api.log("response body: " + body, 'debug');
+                    api.log("err: " + err, 'debug');
+                    if (err || (res.statusCode !== 200 && res.statusCode !== 201)) {
+                        cb(new IllegalArgumentError("Fails to get access token from auth0."));
+                        return;
+                    }
+                    var resp = JSON.parse(body);
+                    accessToken = resp.access_token;
+                    idToken = resp.id_token;
+                    cb();
+                }).form({
+                    "client_id" : api.config.general.oauthClientId,
+                    "client_secret" : api.config.auth0.clientSecret,
+                    "redirect_uri": api.config.auth0.serverName + api.config.auth0.redirectUrl,
+                    "grant_type": "authorization_code",
+                    "code" : code,
+                    "scope" : "openid"
+                });
+            }, function (cb) {
+                //get user info from auth0
+                request("https://" + api.config.general.oauthDomain + ".auth0.com/userinfo?access_token=" + accessToken,
+                    function (err, res, body) {
+                        api.log("response body: " + body, 'debug');
+                        if (err || (res.statusCode !== 200 && res.statusCode !== 201)) {
+                            cb(new IllegalArgumentError("Fails to get user info from auth0."));
+                            return;
+                        }
+
+                        var resp = JSON.parse(body);
+                        socialAccount = parseUserInfo(resp, helper);
+                        socialAccount.accessToken = accessToken;
+                        socialAccount.jsonWebToken = idToken;
+
+                        cb();
+                    });
+            }, function (cb) {
+                if (socialAccount.enterpriseLogin === true) {
+                    api.log("ldap login - get user", "debug");
+                    sqlParams.handle = socialAccount.name;
+                    api.dataAccess.executeQuery('get_user_by_handle', sqlParams, dbConnectionMap, cb);
+                } else {
+                    cb(null, null);
+                }
+            }, function (data, cb) {
+                if (socialAccount.enterpriseLogin === true) {
+                    api.log("ldap login - get password", "debug");
+                    if (data.length !== 0) {
+                        responseResult.handle = data[0].handle;
+                        responseResult.userId = data[0].id;
+                        sqlParams.userId = data[0].id;
+                    } else {
+                        responseResult.handle = '';
+                        responseResult.userId = 0;
+                        sqlParams.userId = 0;
+                    }
+
+                    api.dataAccess.executeQuery('get_password_by_user_id', sqlParams, dbConnectionMap, cb);
+                } else {
+                    cb(null, null);
+                }
+            }, function (data, cb) {
+                if (socialAccount.enterpriseLogin === true) {
+                    api.log("ldap login - forward", "debug");
+                    if (data.length !== 0) {
+                        responseResult.password = data[0].password;
+                    } else {
+                        responseResult.password = '';
+                    }
+
+                    responseResult.result = LOGIN;
+                    responseResult.nextPage = nextPage;
+                    responseResult.socialAccount = socialAccount;
+                    connection.response = responseResult;
+                    next(connection, true);
+                    return;
+                }
+
+                if (socialAccount.socialUserId !== '') {
+                    api.log("social login", "debug");
+                    sqlParams.socialUserId = socialAccount.socialUserId;
+                    sqlParams.providerId = socialAccount.providerId;
+                    api.dataAccess.executeQuery('get_user_id_by_social_user_id_and_provider_id', sqlParams,
+                        dbConnectionMap, cb);
+                } else {
+                    cb(null, null);
+                }
+            },
+            function (data, cb) {
+                if (data !== null && data.length > 0) {
+                    foundUserId = data[0].user_id;
+                }
+                api.log("foundUserId:" + foundUserId, "debug");
+
+                if (foundUserId === null || foundUserId === '') {
+                    if (socialAccount.email === '' && socialAccount.name === '') {
+                        cb(new NotFoundError("The social account should have at least one valid email or one valid username."));
+                        return;
+                    }
+
+                    async.parallel({
+                        getUserIdByEmail: function (cbx) {
+                            if (socialAccount.email !== '') {
+                                sqlParams.email = socialAccount.email;
+                                if (socialAccount.emailVerified === true) {
+                                    sqlParams.emailVerified = 't';
+                                } else {
+                                    sqlParams.emailVerified = 'f';
+                                }
+                                sqlParams.providerId = socialAccount.providerId;
+                                api.dataAccess.executeQuery('get_user_id_by_social_account_email', sqlParams,
+                                    dbConnectionMap, cbx);
+                            } else {
+                                cbx();
+                            }
+                        },
+                        getUserIdByName: function (cbx) {
+                            if (socialAccount.name !== '') {
+                                sqlParams.userName = socialAccount.name;
+                                sqlParams.providerId = socialAccount.providerId;
+                                api.dataAccess.executeQuery('get_user_id_by_social_account_name', sqlParams,
+                                    dbConnectionMap, cbx);
+                            } else {
+                                cbx();
+                            }
+                        }
+                    }, cb);
+                } else {
+                    cb(null, null);
+                }
+            }, function (data, cb) {
+                api.log("foundUserId:" + foundUserId, "debug");
+                if (foundUserId === null || foundUserId === '') {
+                    if (data !== null && data.getUserIdByEmail !== null && data.getUserIdByEmail !== undefined
+                            && data.getUserIdByEmail.length > 0) {
+                        foundUserId = data.getUserIdByEmail[0].user_id;
+                    } else if (data !== null && data.getUserIdByName !== null && data.getUserIdByName !== undefined
+                            && data.getUserIdByName.length > 0) {
+                        foundUserId = data.getUserIdByName[0].user_id;
+                    }
+
+                    if (foundUserId !== null && foundUserId !== '') {
+                        sqlParams.socialUserId = socialAccount.socialUserId;
+                        sqlParams.userId = foundUserId;
+                        api.dataAccess.executeQuery('update_social_user_id', sqlParams, dbConnectionMap, cb);
+                    } else {
+                        cb(null);
+                    }
+                } else {
+                    cb(null);
+                }
+            }, function (cb) {
+                if (foundUserId !== null && foundUserId !== '') {
+                    sqlParams.userId = foundUserId;
+                    api.dataAccess.executeQuery('get_user_by_user_id', sqlParams, dbConnectionMap, cb);
+                } else {
+                    cb(null, null);
+                }
+            }, function (data, cb) {
+                if (foundUserId !== null && foundUserId !== '') {
+                    if (data.length !== 0) {
+                        responseResult.handle = data[0].handle;
+                        responseResult.userId = data[0].id;
+                        sqlParams.userId = data[0].id;
+                    } else {
+                        responseResult.handle = '';
+                        responseResult.userId = 0;
+                        sqlParams.userId = 0;
+                    }
+
+                    api.dataAccess.executeQuery('get_password_by_user_id', sqlParams, dbConnectionMap, cb);
+                } else {
+                    cb(null, null);
+                }
+            }, function (data, cb) {
+                //found user, redirect to next page
+                if (foundUserId !== null && foundUserId !== '') {
+                    if (data.length !== 0) {
+                        responseResult.password = data[0].password;
+                    } else {
+                        responseResult.password = '';
+                    }
+
+                    responseResult.result = LOGIN;
+                    responseResult.nextPage = nextPage;
+                    responseResult.socialAccount = socialAccount;
+
+                    connection.response = responseResult;
+                    next(connection, true);
+                    return;
+                }
+
+                //did not find the user, redirect to register page
+                responseResult.regUrl = "http://www.topcoder.com/?action=callback#access_token="
+                    + socialAccount.accessToken + "&id_token="
+                    + socialAccount.jsonWebToken
+                    + "&token_type=bearer&state=http%3A%2F%2Fwww.topcoder.com";
+
+                responseResult.nextPage = nextPage;
+                responseResult.result = REGISTER;
+                responseResult.socialAccount = socialAccount;
+                connection.response = responseResult;
+                cb();
+            }
+
+        ], function (err) {
+            if (err) {
+                helper.handleError(api, connection, err);
+            }
+
+            next(connection, true);
+        });
+    }
+};
\ No newline at end of file
diff --git a/apiary.apib b/apiary.apib
index d98561495..ec1d60079 100644
--- a/apiary.apib
+++ b/apiary.apib
@@ -7898,3 +7898,104 @@ Payments APIs
             "value":"503",
             "description":"Servers are up but overloaded. Try again later."
         }
+
+## Auth0 Callback API [/auth0/callback]
+### Auth0 Callback API [GET]
+
++ Parameters
+    + code (required, string, `drztXEojbzIYF5mg`) ... The access code.
+    + state (optional, string, `http%3A%2F%2Ftc.cloud.topcoder.com`) ... The redirect url.
+
++ Response 200 (application/json)
+
+        {
+                "code": "kHmqAt0e99pSfAKx",
+                "state": "http://tc.cloud.topcoder.com",
+                "handle": "heffan",
+                "userId": 132456,
+                "password": "4EjPjy6o+/C+dqNPnxIy9A==",
+                "result": "login",
+                "nextPage": "http://tc.cloud.topcoder.com",
+                "socialAccount": {
+                  "name": "tc123bk",
+                  "email": "",
+                  "givenName": "",
+                  "familyName": "",
+                  "emailVerified": false,
+                  "providerId": 4,
+                  "enterpriseLogin": false,
+                  "socialUserId": 5644427,
+                  "jsonWebToken": "eyJ0eXAiOi...",
+                  "accessToken": "STjDXB7tfK2sFgQWIgKuuVUVv0ubZB9k3JBnuCKvkpIl5H4fhOSabOScMxAnhaeW"
+
+        }
+
++ Response 200 (application/json)
+
+        {
+                "code": "GE4U7TEzsB4NMe7e",
+                "state": "http://tc.cloud.topcoder.com",
+                "regUrl": "http://www.topcoder.com/?action=callback#access_token=wu9tZmWRnLJQ8pq0jVjxTEo3PSxnFGOEVyyWjMvudepwxRL1R5yILKSWmuvWX2J6&id_token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.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.0p9nsPLaFtJsnW5W7_Rd7MqH5EEAiALxXwxup4mRxdQ&token_type=bearer&state=http%3A%2F%2Fwww.topcoder.com",
+                "nextPage": "http://tc.cloud.topcoder.com",
+                "result": "register",
+                "socialAccount": {
+                  "name": "",
+                  "email": "email@gmail.com",
+                  "givenName": "name",
+                  "familyName": "name",
+                  "emailVerified": true,
+                  "providerId": 2,
+                  "enterpriseLogin": false,
+                  "socialUserId": "106352201087014578018",
+                  "jsonWebToken": "eyJ0eXAiOi...",
+                  "accessToken": "wu9tZmWRnLJQ8pq0jVjxTEo3PSxnFGOEVyyWjMvudepwxRL1R5yILKSWmuvWX2J6"
+                }
+        }
+
++ Response 200 (application/json)
+
+        {
+                "code": "STSYzhWDjVBqjAIN",
+                "state": "http://tc.cloud.topcoder.com",
+                "handle": "heffan",
+                "userId": 132456,
+                "password": "4EjPjy6o+/C+dqNPnxIy9A==",
+                "result": "login",
+                "nextPage": "http://tc.cloud.topcoder.com",
+                "socialAccount": {
+                  "name": "heffan",
+                  "email": "",
+                  "givenName": "",
+                  "familyName": "",
+                  "emailVerified": false,
+                  "providerId": 50,
+                  "enterpriseLogin": true,
+                  "socialUserId": "132456",
+                  "jsonWebToken": "eyJ0eXAiOi...",
+                  "accessToken": "C6Ayl5Hy2MeMvTIzK7fvsu5I8xhT943UGn9aJRfTPFvikQbPWowVcZW5krwcuDDc"
+                }
+        }
+
++ Response 401 (application/json)
+
+        {
+            "name":"Internal Server Error",
+            "value":"500",
+            "description":"The social account should have at least one valid email or one valid username."
+        }
+
++ Response 400 (application/json)
+
+        {
+            "name":"Internal Server Error",
+            "value":"500",
+            "description":"Fails to get access token from auth0."
+        }
+
++ Response 400 (application/json)
+
+        {
+            "name":"Internal Server Error",
+            "value":"500",
+            "description":"Fails to get user info from auth0."
+        }
\ No newline at end of file
diff --git a/config.js b/config.js
index 667c99660..97d245920 100644
--- a/config.js
+++ b/config.js
@@ -1,8 +1,8 @@
 /*
  * Copyright (C) 2013 - 2014 TopCoder Inc., All Rights Reserved.
  *
- * @author vangavroche, Ghost_141, kurtrips, Sky_, isv, bugbuka
- * @version 1.21
+ * @author vangavroche, Ghost_141, kurtrips, Sky_, isv, bugbuka, flytoj2ee
+ * @version 1.22
  * changes in 1.1:
  * - add defaultCacheLifetime parameter
  * changes in 1.2:
@@ -51,6 +51,8 @@
  * Changes in 1.21:
  * - add minPasswordLength and maxPasswordLength
  * - add resetTokenSuffix
+ * Changes in 1.22:
+ * - add auth0 configuration.
  */
 "use strict";
 
@@ -348,4 +350,10 @@ config.welcomeEmail = {
     senderName: '[topcoder] API'
 };
 
+config.auth0 = {
+    serverName: process.env.AUTH0_SERVER_NAME || 'http://agile-crag-5056.herokuapp.com',
+    clientSecret: process.env.AUTH0_CLIENT_SECRET || '80LhxpoArWfAbgiIekJnDOpRVQcIrjBZ8DGnjDLUFdswwkCOI8zaUhGUZ5dr_2fg',
+    redirectUrl: process.env.AUTH0_REDIRECT_URL || '/v2/auth0/callback'
+};
+
 exports.config = config;
diff --git a/docs/Module Assembly - TopCoder NodeJS Auth0 Callback API v1.0.doc b/docs/Module Assembly - TopCoder NodeJS Auth0 Callback API v1.0.doc
new file mode 100644
index 000000000..64b0ee374
Binary files /dev/null and b/docs/Module Assembly - TopCoder NodeJS Auth0 Callback API v1.0.doc differ
diff --git a/queries/get_password_by_user_id b/queries/get_password_by_user_id
new file mode 100644
index 000000000..59e925364
--- /dev/null
+++ b/queries/get_password_by_user_id
@@ -0,0 +1 @@
+SELECT password FROM security_user WHERE login_id = @userId@
\ No newline at end of file
diff --git a/queries/get_password_by_user_id.json b/queries/get_password_by_user_id.json
new file mode 100644
index 000000000..459452653
--- /dev/null
+++ b/queries/get_password_by_user_id.json
@@ -0,0 +1,5 @@
+{
+  "name"    : "get_password_by_user_id",
+  "db"      : "common_oltp",
+  "sqlfile" : "get_password_by_user_id"
+}
\ No newline at end of file
diff --git a/queries/get_user_by_handle b/queries/get_user_by_handle
new file mode 100644
index 000000000..090f914bd
--- /dev/null
+++ b/queries/get_user_by_handle
@@ -0,0 +1 @@
+SELECT u.user_id as id, u.first_name, u.last_name, u.handle as handle, u.status, u.reg_source AS source, c.comp_country_code AS country, (SELECT e.address FROM user AS u JOIN email AS e ON e.user_id = u.user_id JOIN 'informixoltp':coder AS c ON c.coder_id = u.user_id WHERE u.handle_lower = LOWER('@handle@') AND e.email_type_id = 1 AND e.primary_ind = 1) AS email, (SELECT e.address FROM user AS u JOIN email AS e ON e.user_id = u.user_id JOIN 'informixoltp':coder AS c ON c.coder_id = u.user_id WHERE u.handle_lower = LOWER('@handle@') AND e.email_type_id = 2 AND e.primary_ind = 1) AS second_email FROM user AS u JOIN 'informixoltp':coder AS c ON c.coder_id = u.user_id WHERE u.handle_lower = LOWER('@handle@')
\ No newline at end of file
diff --git a/queries/get_user_by_handle.json b/queries/get_user_by_handle.json
new file mode 100644
index 000000000..431a7daa1
--- /dev/null
+++ b/queries/get_user_by_handle.json
@@ -0,0 +1,5 @@
+{
+  "name"    : "get_user_by_handle",
+  "db"      : "common_oltp",
+  "sqlfile" : "get_user_by_handle"
+}
\ No newline at end of file
diff --git a/queries/get_user_by_user_id b/queries/get_user_by_user_id
new file mode 100644
index 000000000..f24c6fab7
--- /dev/null
+++ b/queries/get_user_by_user_id
@@ -0,0 +1 @@
+SELECT u.user_id as id, u.first_name, u.last_name, u.handle as handle, u.status, u.reg_source AS source, c.comp_country_code AS country, (SELECT e.address FROM email AS e WHERE e.user_id = '@userId@' AND e.email_type_id = 1 AND e.primary_ind = 1) AS email,  (SELECT e.address FROM email AS e WHERE e.user_id = '@userId@' AND e.email_type_id = 2 AND e.primary_ind = 1) AS second_email FROM user AS u JOIN 'informixoltp':coder AS c ON c.coder_id = u.user_id WHERE u.user_id = '@userId@'
\ No newline at end of file
diff --git a/queries/get_user_by_user_id.json b/queries/get_user_by_user_id.json
new file mode 100644
index 000000000..d7066de38
--- /dev/null
+++ b/queries/get_user_by_user_id.json
@@ -0,0 +1,5 @@
+{
+  "name"    : "get_user_by_user_id",
+  "db"      : "common_oltp",
+  "sqlfile" : "get_user_by_user_id"
+}
\ No newline at end of file
diff --git a/queries/get_user_id_by_social_account_email b/queries/get_user_id_by_social_account_email
new file mode 100644
index 000000000..65a55e12b
--- /dev/null
+++ b/queries/get_user_id_by_social_account_email
@@ -0,0 +1 @@
+SELECT user_id FROM user_social_login WHERE social_login_provider_id = @providerId@ AND social_email = '@email@' AND social_email_verified = '@emailVerified@'
\ No newline at end of file
diff --git a/queries/get_user_id_by_social_account_email.json b/queries/get_user_id_by_social_account_email.json
new file mode 100644
index 000000000..dd8a8b515
--- /dev/null
+++ b/queries/get_user_id_by_social_account_email.json
@@ -0,0 +1,5 @@
+{
+  "name"    : "get_user_id_by_social_account_email",
+  "db"      : "common_oltp",
+  "sqlfile" : "get_user_id_by_social_account_email"
+}
\ No newline at end of file
diff --git a/queries/get_user_id_by_social_account_name b/queries/get_user_id_by_social_account_name
new file mode 100644
index 000000000..2484ee6c2
--- /dev/null
+++ b/queries/get_user_id_by_social_account_name
@@ -0,0 +1 @@
+SELECT user_id FROM user_social_login WHERE social_login_provider_id = @providerId@ AND social_user_name = '@userName@'
\ No newline at end of file
diff --git a/queries/get_user_id_by_social_account_name.json b/queries/get_user_id_by_social_account_name.json
new file mode 100644
index 000000000..0010c783c
--- /dev/null
+++ b/queries/get_user_id_by_social_account_name.json
@@ -0,0 +1,5 @@
+{
+  "name"    : "get_user_id_by_social_account_name",
+  "db"      : "common_oltp",
+  "sqlfile" : "get_user_id_by_social_account_name"
+}
\ No newline at end of file
diff --git a/queries/get_user_id_by_social_user_id_and_provider_id b/queries/get_user_id_by_social_user_id_and_provider_id
new file mode 100644
index 000000000..7fec0ff0d
--- /dev/null
+++ b/queries/get_user_id_by_social_user_id_and_provider_id
@@ -0,0 +1 @@
+SELECT user_id FROM user_social_login WHERE social_user_id = '@socialUserId@' AND social_login_provider_id = @providerId@
\ No newline at end of file
diff --git a/queries/get_user_id_by_social_user_id_and_provider_id.json b/queries/get_user_id_by_social_user_id_and_provider_id.json
new file mode 100644
index 000000000..acb9a042d
--- /dev/null
+++ b/queries/get_user_id_by_social_user_id_and_provider_id.json
@@ -0,0 +1,5 @@
+{
+  "name"    : "get_user_id_by_social_user_id_and_provider_id",
+  "db"      : "common_oltp",
+  "sqlfile" : "get_user_id_by_social_user_id_and_provider_id"
+}
\ No newline at end of file
diff --git a/queries/update_social_user_id b/queries/update_social_user_id
new file mode 100644
index 000000000..18194cb15
--- /dev/null
+++ b/queries/update_social_user_id
@@ -0,0 +1 @@
+UPDATE user_social_login set social_user_id = '@socialUserId@' WHERE user_id = '@userId@'
\ No newline at end of file
diff --git a/queries/update_social_user_id.json b/queries/update_social_user_id.json
new file mode 100644
index 000000000..b5d6c3596
--- /dev/null
+++ b/queries/update_social_user_id.json
@@ -0,0 +1,5 @@
+{
+  "name"    : "update_social_user_id",
+  "db"      : "common_oltp",
+  "sqlfile" : "update_social_user_id"
+}
\ No newline at end of file
diff --git a/routes.js b/routes.js
index 1927a1554..7144d9c26 100755
--- a/routes.js
+++ b/routes.js
@@ -1,8 +1,8 @@
 /*
  * Copyright (C) 2013 - 2014 TopCoder Inc., All Rights Reserved.
  *
- * @version 1.34
- * @author vangavroche, Sky_, muzehyun, kurtrips, Ghost_141, ecnu_haozi, hesibo, LazyChild, bugbuka, isv
+ * @version 1.35
+ * @author vangavroche, Sky_, muzehyun, kurtrips, Ghost_141, ecnu_haozi, hesibo, LazyChild, bugbuka, isv, flytoj2ee
  * Changes in 1.1:
  * - add routes for search challenges
  * Changes in 1.2:
@@ -80,6 +80,8 @@
  * - add route for apply develop review opportunities api.
  * changes in 1.34:
  * - added route for client active challenge costs
+ * changes in 1.35:
+ * - added route for auth0 callback api
  */
 
 /* ---------------------
@@ -227,7 +229,9 @@ exports.routes = {
         { path: "/:apiVersion/data/reviewOpportunities", action: "getAlgorithmsReviewOpportunities" },
         { path: "/:apiVersion/software/reviewers/:contestType", action: "getChallengeReviewers" },
         { path: "/:apiVersion/design/statistics/tops/:challengeType", action: "getStudioTops" },
-        { path: "/:apiVersion/data/challengetypes", action: "algorithmsChallengeTypes" }
+        { path: "/:apiVersion/data/challengetypes", action: "algorithmsChallengeTypes" },
+
+        { path: "/:apiVersion/auth0/callback", action: "auth0Callback" }
     ].concat(testMethods.get),
     post: [
         // Stub API
diff --git a/test/test.auth0ViewUrl.js b/test/test.auth0ViewUrl.js
new file mode 100644
index 000000000..444c092ed
--- /dev/null
+++ b/test/test.auth0ViewUrl.js
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2014 TopCoder Inc., All Rights Reserved.
+ *
+ * @version 1.0
+ * @author TCSASSEMBLER
+ */
+"use strict";
+/*global describe, it, before, beforeEach, after, afterEach */
+/*jslint node: true, vars: true, unparam: true */
+
+var request = require('supertest');
+var assert = require('chai').assert;
+
+/**
+ * The api end point.
+ */
+var API_ENDPOINT = process.env.API_ENDPOINT || 'http://localhost:8080';
+
+/**
+ * The test cases for auth0Callback get action.
+ * It only contains fail test cases here.
+ * It cannot auto test the cases which get the correct result. Because it needs to use 3 legs login,
+ * it says, it needs a link to call auth0 widget, forward to auth0 widget, forward to 3rd party
+ * (git/google/facebook...) login page, input username / password, forward to this callback function.
+ * Please refer to deployment guide about how to manually test.
+ */
+describe('Test auth0 Callback View Url', function () {
+    /**
+     * Test empty code. Should return error message.
+     */
+    it('should return error when requesting without code parameter', function (done) {
+        var req = request(API_ENDPOINT)
+            .get('/v2/auth0/callback')
+            .expect('Content-Type', /json/)
+            .expect(200);
+
+        req.end(function (err, resp) {
+            assert.equal(resp.body.error, 'Error: code is a required parameter for this action');
+            done();
+        });
+    });
+
+    this.timeout(120000); //it'll call auth0 server, it maybe slow.
+
+    /**
+     * Test invalid code and state. Should return error message.
+     */
+    it('should return error when requesting with wrong state parameter or state parameter', function (done) {
+        var req = request(API_ENDPOINT)
+            .get('/v2/auth0/callback?code=a&state=b')
+            .expect('Content-Type', /json/)
+            .expect(400);
+
+        req.end(function (err, resp) {
+            assert.equal(resp.body.error.details, 'Fails to get access token from auth0.');
+            done();
+        });
+    });
+});
\ No newline at end of file
diff --git a/test_file/js/jquery-1.4.1.min.js b/test_file/js/jquery-1.4.1.min.js
new file mode 100644
index 000000000..0c7294c90
--- /dev/null
+++ b/test_file/js/jquery-1.4.1.min.js
@@ -0,0 +1,152 @@
+/*!
+ * jQuery JavaScript Library v1.4.1
+ * http://jquery.com/
+ *
+ * Copyright 2010, John Resig
+ * Dual licensed under the MIT or GPL Version 2 licenses.
+ * http://jquery.org/license
+ *
+ * Includes Sizzle.js
+ * http://sizzlejs.com/
+ * Copyright 2010, The Dojo Foundation
+ * Released under the MIT, BSD, and GPL Licenses.
+ *
+ * Date: Mon Jan 25 19:43:33 2010 -0500
+ */
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+null))return this.elem[this.prop];return(a=parseFloat(c.css(this.elem,this.prop,a)))&&a>-10000?a:parseFloat(c.curCSS(this.elem,this.prop))||0},custom:function(a,b,d){function f(i){return e.step(i)}this.startTime=J();this.start=a;this.end=b;this.unit=d||this.unit||"px";this.now=this.start;this.pos=this.state=0;var e=this;f.elem=this.elem;if(f()&&c.timers.push(f)&&!W)W=setInterval(c.fx.tick,13)},show:function(){this.options.orig[this.prop]=c.style(this.elem,this.prop);this.options.show=true;this.custom(this.prop===
+"width"||this.prop==="height"?1:0,this.cur());c(this.elem).show()},hide:function(){this.options.orig[this.prop]=c.style(this.elem,this.prop);this.options.hide=true;this.custom(this.cur(),0)},step:function(a){var b=J(),d=true;if(a||b>=this.options.duration+this.startTime){this.now=this.end;this.pos=this.state=1;this.update();this.options.curAnim[this.prop]=true;for(var f in this.options.curAnim)if(this.options.curAnim[f]!==true)d=false;if(d){if(this.options.display!=null){this.elem.style.overflow=
+this.options.overflow;a=c.data(this.elem,"olddisplay");this.elem.style.display=a?a:this.options.display;if(c.css(this.elem,"display")==="none")this.elem.style.display="block"}this.options.hide&&c(this.elem).hide();if(this.options.hide||this.options.show)for(var e in this.options.curAnim)c.style(this.elem,e,this.options.orig[e]);this.options.complete.call(this.elem)}return false}else{e=b-this.startTime;this.state=e/this.options.duration;a=this.options.easing||(c.easing.swing?"swing":"linear");this.pos=
+c.easing[this.options.specialEasing&&this.options.specialEasing[this.prop]||a](this.state,e,0,1,this.options.duration);this.now=this.start+(this.end-this.start)*this.pos;this.update()}return true}};c.extend(c.fx,{tick:function(){for(var a=c.timers,b=0;b<a.length;b++)a[b]()||a.splice(b--,1);a.length||c.fx.stop()},stop:function(){clearInterval(W);W=null},speeds:{slow:600,fast:200,_default:400},step:{opacity:function(a){c.style(a.elem,"opacity",a.now)},_default:function(a){if(a.elem.style&&a.elem.style[a.prop]!=
+null)a.elem.style[a.prop]=(a.prop==="width"||a.prop==="height"?Math.max(0,a.now):a.now)+a.unit;else a.elem[a.prop]=a.now}}});if(c.expr&&c.expr.filters)c.expr.filters.animated=function(a){return c.grep(c.timers,function(b){return a===b.elem}).length};c.fn.offset="getBoundingClientRect"in r.documentElement?function(a){var b=this[0];if(a)return this.each(function(e){c.offset.setOffset(this,a,e)});if(!b||!b.ownerDocument)return null;if(b===b.ownerDocument.body)return c.offset.bodyOffset(b);var d=b.getBoundingClientRect(),
+f=b.ownerDocument;b=f.body;f=f.documentElement;return{top:d.top+(self.pageYOffset||c.support.boxModel&&f.scrollTop||b.scrollTop)-(f.clientTop||b.clientTop||0),left:d.left+(self.pageXOffset||c.support.boxModel&&f.scrollLeft||b.scrollLeft)-(f.clientLeft||b.clientLeft||0)}}:function(a){var b=this[0];if(a)return this.each(function(s){c.offset.setOffset(this,a,s)});if(!b||!b.ownerDocument)return null;if(b===b.ownerDocument.body)return c.offset.bodyOffset(b);c.offset.initialize();var d=b.offsetParent,f=
+b,e=b.ownerDocument,i,j=e.documentElement,n=e.body;f=(e=e.defaultView)?e.getComputedStyle(b,null):b.currentStyle;for(var o=b.offsetTop,m=b.offsetLeft;(b=b.parentNode)&&b!==n&&b!==j;){if(c.offset.supportsFixedPosition&&f.position==="fixed")break;i=e?e.getComputedStyle(b,null):b.currentStyle;o-=b.scrollTop;m-=b.scrollLeft;if(b===d){o+=b.offsetTop;m+=b.offsetLeft;if(c.offset.doesNotAddBorder&&!(c.offset.doesAddBorderForTableAndCells&&/^t(able|d|h)$/i.test(b.nodeName))){o+=parseFloat(i.borderTopWidth)||
+0;m+=parseFloat(i.borderLeftWidth)||0}f=d;d=b.offsetParent}if(c.offset.subtractsBorderForOverflowNotVisible&&i.overflow!=="visible"){o+=parseFloat(i.borderTopWidth)||0;m+=parseFloat(i.borderLeftWidth)||0}f=i}if(f.position==="relative"||f.position==="static"){o+=n.offsetTop;m+=n.offsetLeft}if(c.offset.supportsFixedPosition&&f.position==="fixed"){o+=Math.max(j.scrollTop,n.scrollTop);m+=Math.max(j.scrollLeft,n.scrollLeft)}return{top:o,left:m}};c.offset={initialize:function(){var a=r.body,b=r.createElement("div"),
+d,f,e,i=parseFloat(c.curCSS(a,"marginTop",true))||0;c.extend(b.style,{position:"absolute",top:0,left:0,margin:0,border:0,width:"1px",height:"1px",visibility:"hidden"});b.innerHTML="<div style='position:absolute;top:0;left:0;margin:0;border:5px solid #000;padding:0;width:1px;height:1px;'><div></div></div><table style='position:absolute;top:0;left:0;margin:0;border:5px solid #000;padding:0;width:1px;height:1px;' cellpadding='0' cellspacing='0'><tr><td></td></tr></table>";a.insertBefore(b,a.firstChild);
+d=b.firstChild;f=d.firstChild;e=d.nextSibling.firstChild.firstChild;this.doesNotAddBorder=f.offsetTop!==5;this.doesAddBorderForTableAndCells=e.offsetTop===5;f.style.position="fixed";f.style.top="20px";this.supportsFixedPosition=f.offsetTop===20||f.offsetTop===15;f.style.position=f.style.top="";d.style.overflow="hidden";d.style.position="relative";this.subtractsBorderForOverflowNotVisible=f.offsetTop===-5;this.doesNotIncludeMarginInBodyOffset=a.offsetTop!==i;a.removeChild(b);c.offset.initialize=c.noop},
+bodyOffset:function(a){var b=a.offsetTop,d=a.offsetLeft;c.offset.initialize();if(c.offset.doesNotIncludeMarginInBodyOffset){b+=parseFloat(c.curCSS(a,"marginTop",true))||0;d+=parseFloat(c.curCSS(a,"marginLeft",true))||0}return{top:b,left:d}},setOffset:function(a,b,d){if(/static/.test(c.curCSS(a,"position")))a.style.position="relative";var f=c(a),e=f.offset(),i=parseInt(c.curCSS(a,"top",true),10)||0,j=parseInt(c.curCSS(a,"left",true),10)||0;if(c.isFunction(b))b=b.call(a,d,e);d={top:b.top-e.top+i,left:b.left-
+e.left+j};"using"in b?b.using.call(a,d):f.css(d)}};c.fn.extend({position:function(){if(!this[0])return null;var a=this[0],b=this.offsetParent(),d=this.offset(),f=/^body|html$/i.test(b[0].nodeName)?{top:0,left:0}:b.offset();d.top-=parseFloat(c.curCSS(a,"marginTop",true))||0;d.left-=parseFloat(c.curCSS(a,"marginLeft",true))||0;f.top+=parseFloat(c.curCSS(b[0],"borderTopWidth",true))||0;f.left+=parseFloat(c.curCSS(b[0],"borderLeftWidth",true))||0;return{top:d.top-f.top,left:d.left-f.left}},offsetParent:function(){return this.map(function(){for(var a=
+this.offsetParent||r.body;a&&!/^body|html$/i.test(a.nodeName)&&c.css(a,"position")==="static";)a=a.offsetParent;return a})}});c.each(["Left","Top"],function(a,b){var d="scroll"+b;c.fn[d]=function(f){var e=this[0],i;if(!e)return null;if(f!==v)return this.each(function(){if(i=ua(this))i.scrollTo(!a?f:c(i).scrollLeft(),a?f:c(i).scrollTop());else this[d]=f});else return(i=ua(e))?"pageXOffset"in i?i[a?"pageYOffset":"pageXOffset"]:c.support.boxModel&&i.document.documentElement[d]||i.document.body[d]:e[d]}});
+c.each(["Height","Width"],function(a,b){var d=b.toLowerCase();c.fn["inner"+b]=function(){return this[0]?c.css(this[0],d,false,"padding"):null};c.fn["outer"+b]=function(f){return this[0]?c.css(this[0],d,false,f?"margin":"border"):null};c.fn[d]=function(f){var e=this[0];if(!e)return f==null?null:this;if(c.isFunction(f))return this.each(function(i){var j=c(this);j[d](f.call(this,i,j[d]()))});return"scrollTo"in e&&e.document?e.document.compatMode==="CSS1Compat"&&e.document.documentElement["client"+b]||
+e.document.body["client"+b]:e.nodeType===9?Math.max(e.documentElement["client"+b],e.body["scroll"+b],e.documentElement["scroll"+b],e.body["offset"+b],e.documentElement["offset"+b]):f===v?c.css(e,d):this.css(d,typeof f==="string"?f:f+"px")}});z.jQuery=z.$=c})(window);
diff --git a/test_file/test.html b/test_file/test.html
new file mode 100644
index 000000000..33725535e
--- /dev/null
+++ b/test_file/test.html
@@ -0,0 +1,42 @@
+<html>
+<head>
+				<script language="JavaScript" type="text/javascript" src="js/jquery-1.4.1.min.js"></script>
+        <script src="//d19p4zemcycm7a.cloudfront.net/w2/auth0-widget-2.3.6.min.js"></script>
+        <script>
+            var widget = new Auth0Widget({
+                domain: 'tc-123-bk.auth0.com',
+                clientID: '3Exj9vFxjckSQ7OMEmUZv3AiykE0K5Oa',
+                callbackURL: 'http://agile-crag-5056.herokuapp.com/v2/auth0/callback'
+            });
+
+            function showAuth0Widget(){
+                widget.signin({
+                    state: 'http://tc.cloud.topcoder.com',
+                    icon: 'http://www.topcoder.com/i/24x24_brackets.png', 
+                    showIcon: true}).on('signin_ready', function() {
+                    $('.a0-email input').each(function() {
+                        $(this)
+                        .clone()
+                        .attr('type','text')
+                        .attr('placeholder', 'Username')
+                        .attr('title', 'Username')
+                        .insertAfter($(this)).prev().remove();
+                    });
+                });  
+            }            
+            
+            $(function () {
+                $('.social-login').click(function () {
+                    showAuth0Widget();
+                });
+            });
+            
+        </script>    
+        
+        
+      </head>
+      
+      <body>
+      	<a class="gMetal social-login" href="javascript:;">Social Login</a>
+      	</body>
+    </html>