login with 42 works, fix crash when session is deleted from database

docker-compose/requirements/djangoserver/file/server/server/views.py

@@ -1,9 +1,26 @@
 from django.http import HttpResponse
-from django.shortcuts import render
+from django.shortcuts import render, redirect
 from .models import User 
+import requests
+import json
+import os
+
+UID42 = None
+SECRET42 = None
+with open("/var/www/djangoserver/42_credentials", 'r') as f:
+	creds = f.read().split(':')
+	UID42=creds[0]
+	SECRET42=creds[1]
+TOKENURL = 'https://api.intra.42.fr/oauth/token'
+INFOURL = 'https://api.intra.42.fr/v2/me'
+REDIRECT = 'https://localhost:8000/login42'
 
 def index(request):
-	request.session.save()
+	try:
+		request.session.save()
+	except Exception:
+		request.session.flush()
+		request.session.save()
 	return render(request, "index.html", {})
 
 def homePage(request):
@@ -12,4 +29,49 @@ def homePage(request):
 
 def lobbyPage(request):
 	request.session.save()
-	return render(request, "lobbyPage.html", {})
+	return render(request, "lobbyPage.html", {})
+
+def login42(request):
+	#url = https://api.intra.42.fr/oauth/authorize?client_id=<CLIENT_ID>&redirect_uri=https://localhost:8000/login42&response_type=code&scope=public'
+	if(request.session.get("logged_in", False)):
+		return HttpResponse("you're already logged in")
+	code = request.GET.get('code', None)
+	if(code == None):
+		return(HttpResponse("code param not found"))
+
+	data = {
+		'grant_type': 'authorization_code',
+		'client_id': UID42,
+		'client_secret': SECRET42,
+		'code': code,
+		'redirect_uri': REDIRECT
+	}
+	print("\033[31m",data)
+	response = requests.post(TOKENURL, data=data)
+	if (response.status_code != 200):
+		print(response.json())
+		return HttpResponse("couln't get authorization token, likely invalid code")
+	response = response.json()
+	headers = {
+		'Authorization': f'Bearer {response["access_token"]}',
+	}
+	response = requests.get(INFOURL, headers=headers)
+	if (response.status_code != 200):
+		return HttpResponse("couln't get user info... what, why ?")
+	response = response.json()
+	id42 = response['id']
+	login42 = response['login']
+	db_user = User.objects.filter(id42=id42)
+	if(not db_user.exists()):
+		while(User.objects.filter(username=login42).exists()):
+			login42 += "_"
+		db_user = [User.objects.create(username=login42, id42=id42)]
+		db_user[0].save()
+	request.session["logged_in"] = True
+	request.session["username"] = db_user[0].username
+	request.session["id"] = db_user[0].id
+	return redirect("/")
+
+def logout(request):
+	request.session.delete()
+	return redirect("/")