From c500abb021f49179b92159cb6d4891b7d76ae1b4 Mon Sep 17 00:00:00 2001
From: Sergey G <s.gaynetdinov@gmail.com>
Date: Fri, 19 Jan 2018 12:35:44 +0500
Subject: [PATCH] LIL-27 Login/registration for facebook

---
 apps/auth/urls.py   |  1 +
 apps/auth/views.py  | 46 +++++++++++++++++++++++++++++++++++++++++++--
 apps/user/models.py |  1 +
 requirements.txt    |  3 ++-
 4 files changed, 48 insertions(+), 3 deletions(-)

diff --git a/apps/auth/urls.py b/apps/auth/urls.py
index d893e6c7..e4278014 100644
--- a/apps/auth/urls.py
+++ b/apps/auth/urls.py
@@ -7,6 +7,7 @@ urlpatterns = [
     path('logout/', views.LogoutView.as_view(), name="logout"),
     path('login/', views.LoginView.as_view(), name="login"),
     path('verification-email/<slug:token>/', views.VerificationEmailView.as_view(), name="verification-email"),
+    path('facebook_login/', views.FacebookLoginOrRegistration.as_view(), name="facebook_login"),
 
     path('password_reset/', views.PasswordResetView.as_view(), name="password_reset"),
     path('password_reset_confirm/<slug:uidb64>/<slug:token>/', views.PasswordResetConfirmView.as_view(), name="password_reset_confirm"),
diff --git a/apps/auth/views.py b/apps/auth/views.py
index dee5b0d8..d1fcc322 100644
--- a/apps/auth/views.py
+++ b/apps/auth/views.py
@@ -1,13 +1,21 @@
+from uuid import uuid4
+
+from facepy import GraphAPI
+from facepy.exceptions import FacepyError
+
 from django.contrib.auth import get_user_model, logout, login, views
 from django.contrib.auth.forms import AuthenticationForm
 from django.http import JsonResponse
+from django.urls import reverse_lazy
+from django.utils.decorators import method_decorator
+from django.views.decorators.csrf import csrf_exempt
 from django.views.generic import FormView, View
 from django.views.generic.edit import BaseFormView
-from django.urls import reverse_lazy
 
+from apps.notification.utils import send_email
+from apps.user.models import LilcityUserSettings, LilcityUserProxy
 from .forms import LearnerRegistrationForm
 from .tokens import verification_email_token
-from apps.notification.utils import send_email
 
 User = get_user_model()
 
@@ -100,3 +108,37 @@ class PasswordResetConfirmView(views.PasswordResetConfirmView):
 
 class PasswordResetComplete(views.PasswordResetCompleteView):
     pass
+
+
+@method_decorator(csrf_exempt, name="dispatch")
+class FacebookLoginOrRegistration(View):
+    def post(self, requests, *args, **kwargs):
+        access_token = requests.POST.get('access_token')
+        graph = GraphAPI(access_token)
+        try:
+            data = graph.get('/me?fields=email, first_name, last_name')
+        except FacepyError:
+            return JsonResponse({"success": False})
+
+        facebook_id = data.get('id')
+
+        lilcity_user_settings = LilcityUserSettings.objects.filter(facebook_id=facebook_id)
+        if lilcity_user_settings.count():
+            login(requests, user=lilcity_user_settings[0].user)
+            return JsonResponse({"success": True})
+
+        email = requests.POST.get('email') or data.get('email')
+        if not email:
+            return JsonResponse({"success": False,
+                                 "errors": {"email": 'is field required'}
+                                 })
+        else:
+            first_name = data.get('first_name', '')
+            last_name = data.get('last_name', '')
+
+            user = LilcityUserProxy.objects.create_user(username=email, email=email, first_name=first_name, last_name=last_name, password=uuid4().hex)
+
+            user.lilcity_user_settings.is_verification_email = True
+            user.lilcity_user_settings.facebook_id = facebook_id
+            user.lilcity_user_settings.save()
+            return JsonResponse({"success": True})
diff --git a/apps/user/models.py b/apps/user/models.py
index ecfa5fa5..82ec3c6d 100644
--- a/apps/user/models.py
+++ b/apps/user/models.py
@@ -23,4 +23,5 @@ class LilcityUserProxy(User):
 class LilcityUserSettings(models.Model):
     user = models.OneToOneField(User, on_delete=models.CASCADE, related_name='lilcity_user_settings')
     is_verification_email = models.BooleanField(default=False)
+    facebook_id = models.PositiveIntegerField(null=True, blank=True, unique=True)
 
diff --git a/requirements.txt b/requirements.txt
index cd8f004f..d6d65ae2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,4 +2,5 @@ Django==2.0.1
 django-anymail[mailgun]==1.2
 paymentwall-python==1.0.7
 twilio==6.10.0
-psycopg2==2.7.3.2
\ No newline at end of file
+psycopg2==2.7.3.2
+facepy==1.0.9
\ No newline at end of file