jon/__init__.py

@@ -22,7 +22,12 @@ def create_app():
     app.config.from_file("config.json", load=json.load, silent=True)
 
     db.init_app(app)
-    auth.init_app(app)
+
+    # This function denies every request until `auth.ACCESS_TOKEN`
+    # is passed using `?token=` to authenticate the session.
+    @app.before_request
+    def before_req_fun():
+        return auth.before_request()
 
     @app.context_processor
     def utility_processor():

jon/auth.py

@@ -1,10 +1,7 @@
 import secrets
 import string
 
-from flask import Blueprint, request, redirect, render_template
-from flask_login import current_user, login_user, logout_user, LoginManager
-from typing import Any, Dict, List, Optional
-
+from flask import Blueprint, request, redirect, render_template, session
 
 bp = Blueprint("auth", __name__, url_prefix="/auth")
 
@@ -18,67 +15,27 @@ ALLOWED_PATHS = [
 ]
 
 
-# A poor man's replacement for memory-backed session solution.
-# We keep exactly one User (and the corresponding UserData) in
-# memory and use that to store session data.
-class UserData:
-    location: Optional[Dict[str, Any]]
-    orders: List[Dict[str, Any]]
-
-    def __init__(self):
-        self.location = None
-        self.orders = []
-
-
-class User:
-    is_authenticated: bool
-    is_active: bool
-    is_anonymous: bool
-
-    data: UserData
-
-    def __init__(self):
-        self.is_authenticated = True
-        self.is_active = True
-        self.is_anonymous = False
-
-        self.data = UserData()
-
-    def get_id(self) -> str:
-        return ""
-
-
-def init_app(app):
-    login_manager = LoginManager(app)
-    the_one_and_only_user = User()
-
-    @login_manager.user_loader
-    def load_user(user_id: str) -> User:
-        assert user_id == ""
-        return the_one_and_only_user
-
-    # This function denies every request until `auth.ACCESS_TOKEN`
-    # is passed using `?token=` to authenticate the user.
-    # We use this instead of @login_required because otherwise we'd have
-    # to add that annotation to all routes.
-    # See also: https://flask-login.readthedocs.io/en/latest/#flask_login.login_required
-    @app.before_request
-    def before_request():
+def before_request():
+    """
+    If the correct token query parameter is passed along with any request,
+    we mark this session authenticated by setting `session["authenticated"]`.
+    Unless the session is authenticated, all requests result in a 403 FORBIDDEN.
+    """
     if "token" in request.args:
         if request.args["token"] == ACCESS_TOKEN:
-                login_user(the_one_and_only_user)
+            session["authenticated"] = ()
         # Reload the page without query parameters
         return redirect(request.path)
 
-        # Never deny any paths in `ALLOWED_PATHS`
+    # Don't deny any paths in `ALLOWED_PATHS`
     if request.path in ALLOWED_PATHS:
         return
 
-        if not current_user.is_authenticated:
+    if not "authenticated" in session:
         return render_template("auth/denied.html"), 403
 
 
 @bp.get("/logout")
 def logout():
-    logout_user()
+    session.pop("authenticated", None)
     return redirect("/")

jon/entry.py

@@ -1,5 +1,5 @@
-from flask import Blueprint, flash, redirect, render_template, request
-from flask_login import current_user
+from flask import Blueprint, flash, redirect, render_template, request, session
+
 
 from . import db
 
@@ -9,18 +9,22 @@ bp = Blueprint("entry", __name__, url_prefix="/entry")
 
 @bp.route("/", methods=["GET", "POST"])
 def index():
+    cart = session.get("cart", default=[])
     return render_template(
-        "entry/index.html"
+        "entry/index.html",
+        cart=cart
     )
 
 
 @bp.post("/add-new-items")
 def add_new_entries():
+    print(session)
+
     i_know_what_im_doing = "i-know-what-im-doing" in request.form
     if not i_know_what_im_doing:
         return "Du weißt nicht was du tust", 400
 
-    orders = current_user.data.orders
+    orders = session.get("cart", default=[])
     if not orders:
         return "Keine Aufträge", 404
     
@@ -32,7 +36,7 @@ def add_new_entries():
     db.get_db().commit()
 
     # Reset the cart
-    current_user.data.orders = []
+    session["cart"] = []
 
     return redirect(request.referrer)
 
@@ -44,7 +48,9 @@ def delete_order():
     except:
         return "Incomplete or mistyped form", 400
 
-    del current_user.data.orders[order_index]
+    cart = session.get("cart", default=[])
+    del cart[order_index]
+    session["cart"] = cart
 
     return redirect(request.referrer)
 
@@ -70,7 +76,9 @@ def new_order():
         except:
             return f"Incomplete or mistyped form", 400
         
-        current_user.data.orders.append({
+        cart = session.get("cart", default=[])
+        print(cart)
+        cart.append({
             "barcode": barcode,
             "name": name,
             "sales_units": sales_units,
@@ -83,6 +91,7 @@ def new_order():
             "net_unit_price": net_unit_price,
             "gross_unit_price": gross_unit_price
         })
+        session["cart"] = cart
         return redirect("/entry")
 
     with db.run_query("entry/get_groups.sql") as cursor:
@@ -113,9 +122,10 @@ def api_search_items():
     except:
         return {"error": "Missing query parameter `search-term`"}, 400
 
-    location = current_user.data.location
+    location = session.get("location", None)
+
     with db.run_query("search_items.sql", {
-        "location_id": location["location_id"] if location else None,
+        "location_id": None if location is None else location["location_id"],
         "search_term": search_term
     }) as cursor:
         items = cursor.fetchall()

jon/inventory.py

@@ -1,5 +1,4 @@
-from flask import Blueprint, redirect, render_template, request
-from flask_login import current_user
+from flask import Blueprint, redirect, render_template, request, session
 
 from . import db
 
@@ -9,7 +8,7 @@ bp = Blueprint("inventory", __name__, url_prefix="/inventory")
 
 @bp.get("/")
 def index():
-    location = current_user.data.location
+    location = session.get("location", None)
     items = db.run_query("get_inventory_overview.sql", {
         "location_id": None if location is None else location["location_id"]
     }).fetchall()
@@ -21,7 +20,7 @@ def index():
 
 @bp.get("/report")
 def read_report():
-    location = current_user.data.location
+    location = session.get("location", None)
     items = db.run_query("get_inventory_report.sql", {
         "location_id": None if location is None else location["location_id"]
     }).fetchall()

jon/location.py

@@ -1,5 +1,4 @@
-from flask import Blueprint, render_template, request
-from flask_login import current_user
+from flask import Blueprint, render_template, request, session
 
 from . import db
 
@@ -12,12 +11,13 @@ def index():
     if request.method == "POST":
         location_id = request.form.get("location_id", "")
         if location_id == "":
-            current_user.data.location = None
+            session.pop("location", None)
         else:
             location = db.run_query("get_location_by_id.sql", {
-                "location_id": location_id
-            }).fetchone()
-            current_user.data.location = location
+                "location_id": location_id}
+            ).fetchone()
+            session["location"] = location
+        
 
     locations = db.run_query("get_locations.sql").fetchall()
 

jon/static/jon.css

@@ -71,6 +71,3 @@ th {
   display: block;
   width: 8em;
 }
-details {
-  font-size: 0.8em;
-}

jon/templates/base.html

@@ -15,10 +15,10 @@
           <li{{ " class=current-page" if request.path.startswith("/entry") else "" }}><a href="/entry">Eintragen</a></li>
           <li{{ " class=current-page" if request.path.startswith("/location") else "" }}>
             <a href="/location">
-            {% if not current_user.data.location %}
+            {% if "location" not in session %}
               Raum wählen
             {% else %}
-              Raum: {{ current_user.data.location.location_name }}
+              Raum: {{ session.location.location_name }}
             {% endif %}
             </a>
           </li>
@@ -30,16 +30,6 @@
       <details>
         <summary><code>config</code></summary>
         <pre>{% for key, value in config.items() %}{{ key }} = {{ value }}
-{% endfor %}</pre>
-      </details>
-      <details>
-        <summary><code>session</code></summary>
-        <pre>{% for key, value in session.items() %}{{ key }} = {{ value }}
-{% endfor %}</pre>
-      </details>
-      <details>
-        <summary><code>current_user.data</code></summary>
-        <pre>{% for key, value in current_user.data.__dict__.items() %}{{ key }} = {{ value }}
 {% endfor %}</pre>
       </details>
       {% endif %}

jon/templates/entry/index.html

@@ -15,7 +15,7 @@
     <th>VK-Preis (Brutto)</th>
     <th>Aktionen</th>
   </tr>
-  {% for cart_item in current_user.data.orders %}
+  {% for cart_item in cart %}
   <tr>
     <td><code>{{ cart_item.barcode }}</code></td>
     <td>{{ cart_item.name }}</td>

jon/templates/location/index.html

@@ -3,9 +3,9 @@
 {% block content %}
 <form method="POST">
   <select name="location_id">
-    <option value="" {{ "selected" if not current_user.data.location else ""}}>-</option>
+    <option value="" {{ "selected" if "location" not in session else ""}}>-</option>
   {% for location in locations %}
-    <option value="{{ location.location_id }}" {{ "selected" if current_user.data.location.location_id == location.location_id else "" }}>{{ location.location_name }}</option>
+    <option value="{{ location.location_id }}" {{ "selected" if "location" in session and session.location.location_id == location.location_id else "" }}>{{ location.location_name }}</option>
   {% endfor %}
   </select>
 

requirements.txt

@@ -1,7 +1,6 @@
 blinker==1.6.2
 click==8.1.3
 Flask==2.3.2
-Flask-Login==0.6.2
 itsdangerous==2.1.2
 Jinja2==3.1.2
 MarkupSafe==2.1.2