处理存在的用户，但尝试通过Facebook OAuth / etc登录 [英] Handling users that exist, but try to login through Facebook OAuth / etc
问题描述
我在我的网站上有一套体面的现有用户，通过他们的电子邮件地址作为用户名登录。
I've got a decent set of existing users on my website who login via their emailaddress as their username.
我正在设置Facebook OAuth机制，以允许新用户更方便地注册，但是当用户已经在我们的系统上注册了一个电子邮件地址，现在尝试通过Facebook登录时，我不知道如何处理这种情况。
I'm setting up Facebook OAuth mechanism to allow new users to sign up more conveniently, but I'm not sure how to handle the scenario when a user who already has an email address registered with our system and now tries to login via Facebook.
- 我应该认为他是同一个用户吗？
- 我应该像新用户一样对待他吗？
由于我没有验证他们的电子邮件地址（当他们直接登录到我的系统）时，情况更复杂，所以我不能假定他们是同一个用户。
The situation is more complicated by the fact that I dont validate their email addresses (when they login directly into my system), so i cant assume they are the same user.
其他人如何解决这个冲突，还是别的人只是把这个用户通过FB连接起来作为一个新的实体？
How do others resolve this conflict, or do other folks simply treat this user connecting via FB as a new entity?
推荐答案
在您的登录屏幕上，用户可以选择：您可以将
On your login screen, users can have a choice: you may put
- 新用户：使用Facebook注册
由于这是一个全新的用户帐户，那么您只需要
since this is a totally new user account, then you just need to do your facebook connect + request for email permission, etc.
- 现有用户：通过电子邮件登录
一旦他们这样做，让他们使用老式的方式登录。然后登录后，提示他们将此电子邮件地址连接到他们的Facebook帐户。所以流程是通过电子邮件登录，然后可选的Facebook连接。
Once they do this, let them login using the old-fashioned way. Then once signed in, prompt them to connect this email address to their facebook account. So the flow is login via email then optional facebook connect.
为此，我假设您已经在user_accounts的数据库表中添加了一个字段，即 facebook_user_id 或 fb_id 或 user_id 等。然后在Facebook连接上，获取登录电子邮件， UPDATE表SET fb_id = xxx WHERE email = xx
To do this, I assume you've added a field on your database table for user_accounts, that is facebook_user_id or fb_id or user_id, etc. Then on facebook connect, get the logged-in-email, UPDATE table SET fb_id = xxx WHERE email = xx
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