feat: improve configuration loader

config/config.json.example

@@ -1,3 +1,4 @@
 {
-  "key" : "INSERTKEYHERE"
+  "directus_base_url" : "https://fragenkatalog.darc.de/",
+  "no_latex": true
 }

src/config.py

@@ -3,28 +3,28 @@ import os
 
 
 class Config:
+    env_prefix = "OHM"
+    access_token: str
+    base_url: str
+    no_latex: bool
 
     def __init__(self):
+        if os.path.isfile("config/config.json"):
+            with open("config/config.json") as file:
+                self.config = json.load(file)
 
-        self.access_token = None
+        self.access_token = self.get_config_value("directus_api_key")
+        self.base_url = self.get_config_value("directus_api_url", "https://fragenkatalog.darc.de/")
+        self.no_latex = self.get_config_value("no_latex", False)
 
-        if os.path.isfile("config/config.json") :
-            with open ("config/config.json") as fh:
-                config_doc = json.load(fh)
-                self.access_token = config_doc["key"]
-        elif 'DIRECTUS_API_KEY' in os.environ.keys():
-            self.access_token = os.environ['DIRECTUS_API_KEY']
+    def get_config_value(self, key: str, default=None):
+        if key in self.config:
+            return self.config[key]
+        elif f"{self.env_prefix}_{key.upper()}" in os.environ.keys():
+            return os.environ[f"{self.env_prefix}_{key.upper()}"]
+        elif default is not None:
+            return default
         else:
-            raise Exception("ERROR: Cannot find API key in config or environment!")
-
-        if 'DIRECTUS_BASEURL' in os.environ.keys():
-            self.base_url = os.environ['DIRECTUS_BASEURL']
-        else:
-            self.base_url = "https://fragenkatalog.darc.de/"
-
-        if not self.access_token:
-            raise Exception("ERROR: Cannot find API key in config or environment!")
-            
-  
-
-
+            raise Exception(
+                f"ERROR: Required value for '{key}' not found. Add to config.json or env as '${self.env_prefix}_{key.upper()}'"
+            )