Adds crypto decoding for payment and canceled status

.gitignore

@@ -6,6 +6,8 @@ static/
 
 myenv/
 
+tournaments/config_local.py
+
 # Byte-compiled / optimized / DLL files
 __pycache__/
 *.py[cod]

requirements.txt

@@ -3,3 +3,4 @@ djangorestframework==3.14.0
 psycopg2-binary==2.9.9
 dj-rest-auth==5.1.0
 django-qr-code==4.0.1
+pycryptodome==3.20.0

tournaments/admin.py

@@ -39,7 +39,7 @@ class TeamRegistrationAdmin(admin.ModelAdmin):
     list_display = ['player_names', 'group_stage_position', 'name', 'tournament']
 
 class TournamentAdmin(admin.ModelAdmin):
-    list_display = ['display_name', 'event', 'is_private', 'start_date']
+    list_display = ['display_name', 'event', 'is_private', 'start_date', 'payment', 'is_canceled']
 
 class TeamScoreAdmin(admin.ModelAdmin):
     list_display = ['team_registration', 'match', 'score', 'walk_out']

tournaments/models/tournament.py

@@ -7,7 +7,8 @@ from . import Event, TournamentPayment, FederalMatchCategory, FederalCategory, F
 import uuid
 from django.utils import timezone, formats
 from datetime import datetime, timedelta
-
+from .. import config_local
+from ..utils.crypto import decrypt_aes_gcm
 
 class TeamSortingType(models.IntegerChoices):
     RANK = 1, 'Rank'
@@ -61,6 +62,25 @@ class Tournament(models.Model):
         else:
             return self.display_name()
 
+    def is_canceled(self):
+        if self.local_id and config_local.CRYPTO_KEY:
+            decrypted = decrypt_aes_gcm(self.local_id, config_local.CRYPTO_KEY)
+            value = int(decrypted[18])
+            if 0 <= value <= 4:
+                return True
+            else:
+                return False
+        else:
+            return False
+
+    def payment(self):
+        if self.global_id and config_local.CRYPTO_KEY:
+            decrypted = decrypt_aes_gcm(self.global_id, config_local.CRYPTO_KEY)
+            value = int(decrypted[18])
+            return TournamentPayment(value)
+        else:
+            return None
+
     def display_name(self):
         if self.name:
             return self.base_name() + " " + self.name

tournaments/utils/crypto.py

@@ -0,0 +1,22 @@
+from Crypto.Cipher import AES
+import base64
+
+
+
+def decrypt_aes_gcm(encrypted_base64, key_base64):
+    # Decode the base64 encoded data and key
+    encrypted_data = base64.b64decode(encrypted_base64)
+    key = base64.b64decode(key_base64)
+
+    # Extract the nonce, tag, and ciphertext from the combined encrypted data
+    nonce = encrypted_data[:12]        # AES GCM nonce is 12 bytes
+    tag = encrypted_data[-16:]         # AES GCM tag is 16 bytes
+    ciphertext = encrypted_data[12:-16] # Ciphertext is everything in between
+
+    # Create the cipher object and decrypt the data
+    cipher = AES.new(key, AES.MODE_GCM, nonce=nonce)
+    decrypted_data = cipher.decrypt_and_verify(ciphertext, tag)
+
+    # Convert decrypted bytes to string (assuming UTF-8 encoding)
+    decrypted_text = decrypted_data.decode('utf-8')
+    return decrypted_text