Fix/pylint cleanup (#8)

* Fix pylint warnings across all 24 Python files in web_server

- Add module, class, and function docstrings (C0114, C0115, C0116)
- Fix import ordering: stdlib before third-party before local (C0411)
- Replace wildcard imports with explicit named imports (W0401)
- Remove trailing whitespace and add missing final newlines (C0303, C0304)
- Replace dict() with dict literals (R1735)
- Remove unused imports and variables (W0611, W0612)
- Narrow broad Exception catches to specific exceptions (W0718)
- Replace f-string logging with lazy % formatting (W1203)
- Fix variable naming: UPPER_CASE for constants, snake_case for locals (C0103)
- Add pylint disable comments for necessary global statements (W0603)
- Fix no-else-return, simplifiable-if-expression, singleton-comparison
- Fix bad indentation in stripe.py (W0311)
- Add encoding="utf-8" to open() calls (W1514)
- Add check=True to subprocess.run() calls (W1510)
- Register Celery task modules via conf.include

* Update `package-lock.json` add peer dependencies

web_server/blueprints/stripe.py

@@ -1,7 +1,11 @@
+"""Stripe payment integration blueprint."""
+
+import os
+
 from flask import Blueprint, request, jsonify, session as s
 from blueprints.middleware import login_required
 from utils.user_utils import subscribe
-import os, stripe
+import stripe
 
 stripe_bp = Blueprint("stripe", __name__)
 
@@ -20,7 +24,7 @@ def create_checkout_session():
         # Checks to see who is subscribing to who
         user_id = s.get("user_id")
         streamer_id = request.args.get("streamer_id")
-        session = stripe.checkout.Session.create(
+        checkout_session = stripe.checkout.Session.create(
             ui_mode = 'embedded',
             payment_method_types=['card'],
             line_items=[
@@ -33,19 +37,24 @@ def create_checkout_session():
             redirect_on_completion = 'never',
             client_reference_id = f"{user_id}-{streamer_id}"
         )
-    except Exception as e:
+    except (ValueError, TypeError, KeyError) as e:
         return str(e), 500
 
-    return jsonify(clientSecret=session.client_secret)
+    return jsonify(clientSecret=checkout_session.client_secret)
 
-@stripe_bp.route('/session-status') # check for payment status
+@stripe_bp.route('/session-status')  # check for payment status
 def session_status():
-  """
-  Used to query payment status
-  """
-  session = stripe.checkout.Session.retrieve(request.args.get('session_id'))
+    """
+    Used to query payment status
+    """
+    checkout_session = stripe.checkout.Session.retrieve(
+        request.args.get('session_id')
+    )
 
-  return jsonify(status=session.status, customer_email=session.customer_details.email)
+    return jsonify(
+        status=checkout_session.status,
+        customer_email=checkout_session.customer_details.email
+    )
 
 @stripe_bp.route('/stripe/webhook', methods=['POST'])
 def stripe_webhook():
@@ -65,13 +74,20 @@ def stripe_webhook():
         raise e
     except stripe.error.SignatureVerificationError as e:
         raise e
-    
-    if event['type'] == "checkout.session.completed": # Handles payment success webhook
-        session = event['data']['object']
-        product_id = stripe.checkout.Session.list_line_items(session['id'])['data'][0]['price']['product']
+
+    # Handles payment success webhook
+    if event['type'] == "checkout.session.completed":
+        checkout_session = event['data']['object']
+        product_id = stripe.checkout.Session.list_line_items(
+            checkout_session['id']
+        )['data'][0]['price']['product']
         if product_id == subscription:
-            client_reference_id = session.get("client_reference_id")
-            user_id, streamer_id = map(int, client_reference_id.split("-"))
+            client_reference_id = checkout_session.get(
+                "client_reference_id"
+            )
+            user_id, streamer_id = map(
+                int, client_reference_id.split("-")
+            )
             subscribe(user_id, streamer_id)
 
-    return "Success", 200
+    return "Success", 200