support to login with github enterprise

Signed-off-by: kamijin_fanta <kamijin@live.jp>

Author: kamijin-fanta

config.json.example

@@ -50,6 +50,7 @@
             "consumerSecret": "change this"
         },
         "github": {
+            "enterpriseURL": "if you use github.com, not need to specify",
             "clientID": "change this",
             "clientSecret": "change this"
         },

lib/models/user.js

@@ -103,7 +103,8 @@ module.exports = function (sequelize, DataTypes) {
         else photo += '?size=bigger'
         break
       case 'github':
-        photo = 'https://avatars.githubusercontent.com/u/' + profile.id
+        if (profile.photos && profile.photos[0]) photo = profile.photos[0].value.replace('?', '')
+        else photo = 'https://avatars.githubusercontent.com/u/' + profile.id
         if (bigger) photo += '?s=400'
         else photo += '?s=96'
         break

lib/web/auth/github/index.js

@@ -6,13 +6,21 @@ const GithubStrategy = require('passport-github').Strategy
 const config = require('../../../config')
 const response = require('../../../response')
 const { setReturnToFromReferer, passportGeneralCallback } = require('../utils')
+const { URL } = require('url')
 
 const githubAuth = module.exports = Router()
 
+function githubUrl (path) {
+  return config.github.enterpriseURL && new URL(path, config.github.enterpriseURL).toString()
+}
+
 passport.use(new GithubStrategy({
   clientID: config.github.clientID,
   clientSecret: config.github.clientSecret,
-  callbackURL: config.serverURL + '/auth/github/callback'
+  callbackURL: config.serverURL + '/auth/github/callback',
+  authorizationURL: githubUrl('login/oauth/authorize'),
+  tokenURL: githubUrl('login/oauth/access_token'),
+  userProfileURL: githubUrl('api/v3/user')
 }, passportGeneralCallback))
 
 githubAuth.get('/auth/github', function (req, res, next) {