社交登录验证规则

Question

I was trying to implement social login with laravel. Everything seems OK. User can login . But problem is same email with facebook & google + also logged in. So i don't want to let login with same email. How do i implement validation rule for social login? Here is the code ii was trying for validation but it throws in $validator

 public function redirectToProvider($provider)
     {
         return Socialite::driver($provider)->redirect();
     }

    public function handleProviderCallback($provider,Request $request)
    {
        if (!$request->has('code') || $request->has('denied'))
        {
            return redirect('/');
        }
        $user = Socialite::driver($provider)->user();     
        $authUser = $this->findOrCreateUser($user, $provider);
        Auth::login($authUser, true);      
    }

    public function findOrCreateUser($user, $provider)
    {
        $authUser = User::where('provider_id', $user->id)->first();
        if ($authUser) 
        {
            return $authUser;
        }

    $validator = Validator::make($user->toArray(), [
            'email' => 'max:255|unique:users',

        ]);
    if ($validator->passes())
    {

    return  User::create([
            'name'     => $user->name,
            'email'    => $user->email,
            'provider' => $provider,
            'provider_id' => $user->id,
            ]);
    }
        return Redirect::to('login')->with('errors',$validator->errors()); 
    }

Answer 1

I didn't really understand your question but i tried to refactor your function

public function findOrCreateUser($user, $provider)
{
    $authUser = User::where('provider_id', $user->getId())->first();
    if ($authUser) 
    {
        return $authUser;
    }

   $email = User::where('email', $user->getEmail())->first();

   if (! $email)
   {

    return  User::create([
        'name'     => $user-> getName(),
        'email'    => $user-> getEmail(),
        'provider' => $provider,
        'provider_id' => $user->getId(),
        ]);
    }
    return Redirect::to('login')->with('errors',"Sorry ! This email Already Exists"); 
}

Answer 2

I didn't understand the question but here's my guess on what you need.

My Guess: You want to keep email in users table unique.

You can create an additional table to keep records of social login methods named Connected Accounts. Keep basic user info in users table and link the social accounts to the same email record in users table. You give login on the basis of users table and add different social login accounts to connected accounts table.

Users Table

    Schema::create('users', function (Blueprint $table) {
            $table->increments('id');
            $table->string('username');
            $table->string('firstname');
            $table->string('lastname')->nullable();
            $table->string('email')->unique();
            $table->string('password')->nullable();
            $table->rememberToken();
            $table->timestamps(); 
});

Connected Accounts Table

Schema::create('connected_accounts', function(Blueprint $table){
            $table->increments('id');
            $table->integer('user_id')->unsigned();
            $table->string('account_type');
            $table->string('provider')->nullable();
            $table->string('provider_id');
            $table->text('token')->nullable();
            $table->timestamps();

            $table->foreign('user_id')->references('id')->on('users');
        });

Find or Create user code (if user exists add social login information to connected accounts else create user and add social login information to connected accounts):

public function findOrCreateUser($user, $provider) {
        $userExists = User::where('email', $user->email)->first();
        if($userExists) {
            $connectedAccount = ConnectedAccount::where('provider_id', $user->id)->first();
            if ($connectedAccount) {
                return $connectedAccount->user;
            }
            else{
                $connectedAccount = new ConnectedAccount();
                $connectedAccount->user_id = $userExists->id;
                $connectedAccount->account_type = 'social';
                $connectedAccount->provider = $provider;
                $connectedAccount->token = $user->token;
                $connectedAccount->provider_id = $user->id;
                $connectedAccount->save();

                return $userExists;
            }
        }
        else{
            $firstName = '';
            $lastName = '';

            if($provider == 'facebook'){
                $name = explode(' ',$user->name);
                $firstName = $name[0];
                $lastName = $name[1];
                $profile_pic = $user->avatar_original;
            }
            else if($provider == 'google'){
                $firstName = $user->user['name']['givenName'];
                $lastName = $user->user['name']['familyName'];
                $profile_pic = $user->avatar_original;
            }
            else if($provider == 'linkedin'){
                $firstName = $user->user['firstName'];
                $lastName = $user->user['lastName'];
                $profile_pic = $user->avatar_original;
            }
            else if($provider == 'github'){
                $name = explode(' ',$user->name);
                $firstName = $name[0];
                if(isset($name[1])){
                    $lastName = $name[1];
                }
                $profile_pic = $user->avatar;
            }

            $uploadedPic = $this->transferProfilePicture($profile_pic);

            $userNew =  User::create([
                'firstname' => $firstName,
                'lastname' => $lastName,
                'username' => md5($user->email),
                'email'    => $user->email,
                'profile_pic' => $uploadedPic,
                'is_verified' => 1
            ]);

            $connectedAccount = new ConnectedAccount();
            $connectedAccount->user_id = $userNew->id;
            $connectedAccount->account_type = 'social';
            $connectedAccount->provider = $provider;
            $connectedAccount->token = $user->token;
            $connectedAccount->provider_id = $user->id;
            $connectedAccount->save();

            return $userNew;
        }
    }