Added Authentication for Minecraft Server

In this commit, a beautiful authentication method was added! It can be
uses to authenticate SECURLY!!!! with the McFet Plugin! This is pretty
USEFULL!!!

fet2020/fet2020/settings.py

@@ -17,6 +17,7 @@ env = environ.Env(
     ETHERPAD_HOST=(str, ""),
     ETHERPAD_GROUP=(str, ""),
     GALLERY_PATH=(str, "uploads/gallery"),
+    MC_MASTERPASSWORD=(str, ""),
 )
 
 # Build paths inside the project like this: os.path.join(BASE_DIR, ...)
@@ -396,3 +397,6 @@ THUMBNAIL_ALIASES = {
         "portrait": {"size": (200, 300), "crop": False},
     },
 }
+
+# Minecraft Auth
+MC_MASTERPASSWORD = env("MC_MASTERPASSWORD")

fet2020/fet2020/urls.py

@@ -40,6 +40,7 @@ urlpatterns = [
     path("posts/", include("posts.urls")),
     path("rental/", include("rental.urls")),
     path("search/", include("search.urls")),
+    path("minecraft/", include("minecraft.urls")),
     path(
         "discord/",
         RedirectView.as_view(url="https://discord.com/invite/7qRuuMA"),

fet2020/minecraft/urls.py

@@ -0,0 +1,9 @@
+from django.urls import path
+
+from . import views
+
+app_name = "Minecraft"
+
+urlpatterns = [
+    path("", views.index, name="index"),
+]

fet2020/minecraft/views.py

@@ -0,0 +1,42 @@
+import logging
+from django.shortcuts import render
+from authentications.decorators import authenticated_user
+from django.conf import settings
+
+
+logger = logging.getLogger(__name__)
+
+
+# Function that generates a token depending on unsername and masterpassword
+# The masterpassword must be 32 characters long!
+def create_token(username, masterpassword):
+
+    padded_username = username.ljust(32, ':')
+
+    token = bytearray()
+    # xor connect with masterpassword to create token
+    for i in range(32):
+        token.append(ord(padded_username[i]) ^ ord(masterpassword[i]))
+
+    str_token = token.hex()
+    return str_token
+
+
+@authenticated_user
+def index(request):
+    username = request.user
+    context = {
+        "mctoken": "",
+        "valid_master_pwd": True
+    }
+
+    masterpassword = settings.MC_MASTERPASSWORD
+
+    if len(masterpassword) != 32:
+        context["valid_master_pwd"] = False
+        logger.error("Masterpassword must be 32 characters long")
+    else:
+        token = create_token(str(username), masterpassword)
+        context["mctoken"] = token
+
+    return render(request, "minecraft/index.html", context)

fet2020/templates/minecraft/index.html

@@ -0,0 +1,21 @@
+{% extends 'base.html' %}
+
+{% load static %}
+
+{% block title %}Minecraft{% endblock %}
+
+{% block content %}
+<main>
+  <div class="container mx-auto w-full px-4 my-8 flex-1">
+	  <h1 class="page-title">Minecraft</h1>
+
+	  {% if valid_master_pwd %}
+	  <h2>Dein persömlicher Token für den Minecraft-Server:</h2>
+	  <p>{{ mctoken }}</p>
+	  {% else %}
+	  <h2>Ups... Das hat nicht geklappt!</h2>
+	  <p>Bitte informiere einen Admin!</p>
+	  {% endif %}
+  </div>
+</main>
+{% endblock %}