feat: generate and validate config.ini

Signed-off-by: mctaylors <cantsendmails@mctaylors.ru>

config.py

@@ -1,10 +1,70 @@
 import configparser
+from os import path
 from typing import Optional
 
 import requests
 
+config_file = "config.ini"
+
 _c = configparser.ConfigParser()
-_c.read("config.ini", "utf-8")
+_c.optionxform = str
+
+
+def init_config() -> None:
+    _validate_config()
+    global general, app
+    general = _General()
+    app = _App()
+
+
+def _validate_config() -> None:
+    default_config = {
+        "General": {"Token": "", "SourceUrl": ""},
+        "App": {
+            "Name": "Danbooru",
+            "Host": "stashboo.ru",
+            "HostName": "",
+            "PreferSecureProtocol": True,
+        },
+    }
+
+    if not path.exists(config_file):
+        for section, options in default_config.items():
+            _c[section] = options
+        with open(config_file, "w") as cf:
+            _c.write(cf)
+        print(f"{config_file} generated successfully.")
+        return
+    else:
+        _c.read(config_file, "utf-8")
+
+    is_valid = True
+    for section, options in default_config.items():
+        if section != "DEFAULT" and not _c.has_section(section):
+            print(f"Missing section: [{section}]")
+            is_valid = False
+        for option in options:
+            if not _c.has_option(section, option):
+                print(f"Missing option: '{option}' in section [{section}]")
+                is_valid = False
+    if not is_valid:
+        print("Config is invalid.")
+        exit(1)
+
+    try:
+        response = requests.get(
+            f"http://{_c.get("App", "Host")}/status.json", timeout=10
+        )
+        if response.status_code != 200:
+            raise requests.exceptions.InvalidURL
+    except requests.exceptions.RequestException:
+        print(f"Unable to validate: 'Host' in section [App]")
+        is_valid = False
+    if not is_valid:
+        print("Config is invalid.")
+        exit(1)
+
+    return
 
 
 class _General:
@@ -12,6 +72,7 @@ class _General:
     sourceurl: Optional[str]
 
     def __init__(self):
+        _c.read(config_file, "utf-8")
         self.token = _c.get("General", "Token")
         self.sourceurl = _c.get("General", "SourceUrl")
         if not self.sourceurl.startswith("http://") and not self.sourceurl.startswith(
@@ -26,15 +87,9 @@ class _App:
     hostname: str
 
     def __init__(self):
+        _c.read(config_file, "utf-8")
         self.name = _c.get("App", "Name")
         self.host = _c.get("App", "Host")
-        try:
-            response = requests.get(f"http://{self.host}/status.json", timeout=10)
-            if response.status_code != 200:
-                raise requests.exceptions.InvalidURL
-        except requests.exceptions.RequestException:
-            print("Unable validate App.Host in config.ini.")
-            exit(1)
         self.hostname = _c.get("App", "HostName")
         if not self.hostname:
             self.hostname = self.host
@@ -43,5 +98,5 @@ class _App:
             self.protocol = "https"
 
 
-general = _General()
-app = _App()
+general = None
+app = None