Add google sign-in

Also, try to be a bit more correct with CSRF and CORS.
It works on my machine.

Dockerfile

@@ -1,7 +1,7 @@
 FROM alpine:3.18
 
-RUN apk --no-cache add python3 inkscape bash imagemagick ghostscript font-noto
-RUN apk --no-cache add py3-pip && pip3 install --break-system-packages django tzdata gunicorn
+RUN apk --no-cache add python3 inkscape bash imagemagick ghostscript font-noto py3-pip
+RUN pip3 install --break-system-packages django tzdata gunicorn google-api-python-client
 
 ADD backend /zetikettes
 

backend/zetikettes/tikette/middleware.py

@@ -0,0 +1,15 @@
+from django.http import HttpResponse
+
+
+def cors_everywhere(get_response):
+    def middleware(request):
+        if request.method == 'OPTIONS':
+            response = HttpResponse()
+        else:
+            response = get_response(request)
+        response["Access-Control-Allow-Origin"] = request.headers.get("Origin", "*")
+        response["Access-Control-Allow-Credentials"] = "true"
+        response["Access-Control-Allow-Headers"] = "x-csrftoken"
+        return response
+
+    return middleware

backend/zetikettes/tikette/views.py

@@ -1,14 +1,44 @@
 import json
+import sys
 
 from django.conf import settings
+from django.core.exceptions import PermissionDenied
 from django.http import JsonResponse
 from django.shortcuts import render
 from django.views.decorators.csrf import csrf_exempt
+from google.auth.transport import requests
+from google.oauth2 import id_token
 
 from .planche import generate as stickersheet
-from .models import Tikette, Tikategory
+from .models import Tikette, Tikategory, Tizer
 
-CORS={'access-control-allow-origin': '*'}
+
+def ok(payload=None):
+    return JsonResponse({'status': 'ok', **(payload or {})})
+
+
+def post_please(f):
+    def __f(request):
+        if request.method != "POST":
+            return JsonResponse({'status': 'notok', 'message': 'this isn\'t the way'},
+                                status=405, headers={'Allow': 'POST'})
+        return f(request)
+    return __f
+
+
+def auth_only(f):
+    def __f(request):
+        # check that email is valid
+        # exp?
+        print(request.META, file=sys.stderr)
+        if 'user_data' not in request.session:
+            raise PermissionDenied('Not logged in')
+        email = request.session['user_data']['email']
+        resp = Tizer.objects.filter(email=email)
+        if not resp:
+            raise PermissionDenied('User not found')
+        return f(request)
+    return __f
 
 
 def quirk_bold_allergens(ingredients):
@@ -21,6 +51,7 @@ def quirk_bold_allergens(ingredients):
     return ", ".join(out)
 
 
+@auth_only
 def get_list(request):
     tikettes = [{
         'id': x.id,
@@ -35,22 +66,21 @@ def get_list(request):
         'color': x.color,
         'subs': {x.name: x.default for x in x.category.subs.all()},
         } for x in Tikette.objects.all()]
-    return JsonResponse({'status': 'ok', 'tikettes': tikettes}, headers=CORS)
+    return ok({'tikettes': tikettes})
 
 
+@auth_only
 def get_categories(request):
     tikats = [{
         'id': x.id,
         'name': x.name,
         } for x in Tikategory.objects.all()]
-    return JsonResponse({'status': 'ok', 'tikats': tikats}, headers=CORS)
+    return ok({'tikats': tikats})
 
 
-@csrf_exempt
+@auth_only
+@post_please
 def generate(request):
-    if request.method != "POST":
-        return JsonResponse({'status': 'notok', 'message': 'this isn\'t the way'})
-
     payload = json.loads(request.body)
 
     subs = dict(payload['subs'])
@@ -61,27 +91,47 @@ def generate(request):
                                     out_dir=settings.TIKETTE_OUT_DIR,
                                     landscape=payload['landscape'])
 
-    return JsonResponse({'status': 'ok', 'file': pdfpath}, headers=CORS)
+    return ok({'file': pdfpath})
 
 
-@csrf_exempt
+@auth_only
+@post_please
 def newtikette(request):
-    if request.method != "POST":
-        return JsonResponse({'status': 'notok', 'message': 'this isn\'t the way'})
-
     payload = json.loads(request.body)
     tikette = Tikette(**payload)
     tikette.save()
 
-    return JsonResponse({'status': 'ok'}, headers=CORS)
+    return ok()
 
 
-@csrf_exempt
+@auth_only
+@post_please
 def deletetikette(request):
-    if request.method != "POST":
-        return JsonResponse({'status': 'notok', 'message': 'this isn\'t the way'})
-
     payload = json.loads(request.body)
     Tikette.objects.get(id=payload["id"]).delete()
 
-    return JsonResponse({'status': 'ok'}, headers=CORS)
+    return ok()
+
+
+@csrf_exempt
+@post_please
+def signin(request):
+    payload = json.loads(request.body)
+    token = payload['token']
+
+    try:
+        user_data = id_token.verify_oauth2_token(
+            token, requests.Request(), settings.GOOGLE_OAUTH_CLIENT_ID
+        )
+    except ValueError:
+        raise
+        return JsonResponse({'status': 'notok'}, status=403)
+
+    request.session['user_data'] = user_data
+
+    return ok(user_data)
+
+
+def signout(request):
+    del request.session['user_data']
+    return ok()

backend/zetikettes/zetikettes/settings.py

@@ -53,6 +53,7 @@ MIDDLEWARE = [
     'django.contrib.auth.middleware.AuthenticationMiddleware',
     'django.contrib.messages.middleware.MessageMiddleware',
     'django.middleware.clickjacking.XFrameOptionsMiddleware',
+    'tikette.middleware.cors_everywhere',
 ]
 
 ROOT_URLCONF = 'zetikettes.urls'
@@ -129,3 +130,6 @@ STATIC_ROOT = 'www_static'
 # https://docs.djangoproject.com/en/4.2/ref/settings/#default-auto-field
 
 DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'
+
+# not a secret
+GOOGLE_OAUTH_CLIENT_ID = '634510965520-c5l7f15fn4koraqhpqfe01ssn8v0q2qk.apps.googleusercontent.com'

backend/zetikettes/zetikettes/urls.py

@@ -29,4 +29,6 @@ urlpatterns = [
     path('generate', tikette.views.generate),
     path('newtikette', tikette.views.newtikette),
     path('deletetikette', tikette.views.deletetikette),
+    path('signin', tikette.views.signin),
+    path('signout', tikette.views.signout),
 ] + static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)

frontend/config.js

@@ -1 +1,2 @@
 const backend_api = '/zetikettes/srv/'
+const google_oauth_client_id = '634510965520-c5l7f15fn4koraqhpqfe01ssn8v0q2qk.apps.googleusercontent.com';

frontend/index.html

@@ -14,6 +14,7 @@
 
         <!-- Compiled and minified JavaScript -->
         <script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/js/materialize.min.js"></script>
+        <script src="https://accounts.google.com/gsi/client"></script>
 
         <script src="jscolor.min.js"></script>
         <script src="config.js"></script>
@@ -46,6 +47,7 @@ main {
         </nav>
         <main class="container row">
             <p></p>
+            <div class="col s4 offset-s4" id="signin-prompt" style="display: none"></div>
             <div class="col m6 offset-m3 s12">
                 <a class="modal-trigger btn orange hide-on-large-only" href="#newproduct"><i class="material-icons left">add</i>Nouveau produit</a>
                 <ul class="collapsible" id="appbody">

frontend/zetikettes.js

@@ -8,6 +8,28 @@ const params = {
 
 var tikats;
 
+function getCookie(name) {
+    const cookies = document.cookie.split(';');
+    for (let cookie of cookies) {
+        cookie = cookie.trim();
+        if (cookie.startsWith(name + '=')) {
+            return cookie.substring(name.length + 1);
+        }
+    }
+    return null;
+}
+
+function post(url, data) {
+    const csrf_token = getCookie('csrftoken');
+    return $.ajax({
+        url,
+        data: JSON.stringify(data),
+        method: 'POST',
+        xhrFields: { withCredentials: true },
+        headers: { 'X-CSRFToken': csrf_token },
+    });
+}
+
 function addProduct(tikette) {
     const zett = tikette;
     const appbody = $("#appbody");
@@ -38,7 +60,7 @@ function addProduct(tikette) {
                 loader.show();
                 $('.btn').addClass("disabled");
 
-                $.post(backend_api + 'generate', JSON.stringify(req))
+                post(backend_api + 'generate', req)
                     .then(data => {
                         const pdfbtn = $(`<a class="btn" href="${backend_api}data/${data.file}" target="_blank">open pdf</a>`);
                         action.append(pdfbtn);
@@ -58,7 +80,7 @@ function addProduct(tikette) {
         const req = {
             id: zett.id,
         };
-        $.post(backend_api + 'deletetikette', JSON.stringify(req)).then(reload);
+        post(backend_api + 'deletetikette', req).then(reload);
 
         return false;
     });
@@ -115,7 +137,7 @@ function loadAll(zetikettes) {
             color,
             ab,
         };
-        $.post(backend_api + 'newtikette', JSON.stringify(req)).then(reload);
+        post(backend_api + 'newtikette', req).then(reload);
     });
 }
 
@@ -134,22 +156,45 @@ function konami() {
     });
 }
 
+async function googleCred(creds) {
+    const token = creds.credential;
+    await post(backend_api + 'signin', {token});
+    $('#signin-prompt').hide();
+    reload();
+}
+
 async function reload() {
     try {
         const resp = await $.ajax({
             url: backend_api + 'list',
             timeout: 1000,
+            xhrFields: { withCredentials: true },
         });
         tikats = (await $.ajax({
             url: backend_api + 'categories',
             timeout: 1000,
+            xhrFields: { withCredentials: true },
         })).tikats.sort((a, b) => a.name > b.name ? 1 : -1);
         loadAll(resp.tikettes.sort((a, b) => (a.title < b.title) ? -1 : 1));
     } catch(e) {
+        if (e.status === 403) {
+            $("#signin-prompt").show();
+            google.accounts.id.prompt(); // also display the One Tap dialog
+            return;
+        }
         const appbody = $("#appbody");
         appbody.append(`<li>Could not reach backend server`);
-        throw e;
     }
 }
 
-$(document).ready(reload);
+$(document).ready(() => {
+    google.accounts.id.initialize({
+        client_id: google_oauth_client_id,
+        callback: googleCred,
+    });
+    google.accounts.id.renderButton(
+        document.getElementById("signin-prompt"),
+        { theme: "outline", size: "large" }  // customization attributes
+    );
+    reload();
+});