Proper dynamic config reload

A bunch of options can now be changed without a restart as the config is
now guaranteed to be reloaded on change through the use of a RELOADCONFIG environment variable.

jellyfin_accounts/config.py

@@ -0,0 +1,95 @@
+import os
+import configparser
+import secrets
+from pathlib import Path
+
+
+class Config:
+    """
+    Configuration object that can automatically reload modified settings.
+    Behaves mostly like a dictionary.
+    :param file: Path to config.ini, where parameters are set.
+    :param instance: Used to identify specific jf-accounts instances in environment variables.
+    :param data_dir: Path to directory with config, invites, templates, etc.
+    :param local_dir: Path to internally stored config base, emails, etc.
+    """
+
+    @staticmethod
+    def load_config(config_path, data_dir, local_dir, log):
+        config = configparser.RawConfigParser()
+        config.read(config_path)
+        for key in config["files"]:
+            if config["files"][key] == "":
+                if key != "custom_css":
+                    log.debug(f"Using default {key}")
+                    config["files"][key] = str(data_dir / (key + ".json"))
+
+        for key in ["user_configuration", "user_displayprefs"]:
+            if key not in config["files"]:
+                log.debug(f"Using default {key}")
+                config["files"][key] = str(data_dir / (key + ".json"))
+
+        if "no_username" not in config["email"]:
+            config["email"]["no_username"] = "false"
+            log.debug("Set no_username to false")
+        if (
+            "email_html" not in config["password_resets"]
+            or config["password_resets"]["email_html"] == ""
+        ):
+            log.debug("Using default password reset email HTML template")
+            config["password_resets"]["email_html"] = str(local_dir / "email.html")
+        if (
+            "email_text" not in config["password_resets"]
+            or config["password_resets"]["email_text"] == ""
+        ):
+            log.debug("Using default password reset email plaintext template")
+            config["password_resets"]["email_text"] = str(local_dir / "email.txt")
+
+        if (
+            "email_html" not in config["invite_emails"]
+            or config["invite_emails"]["email_html"] == ""
+        ):
+            log.debug("Using default invite email HTML template")
+            config["invite_emails"]["email_html"] = str(local_dir / "invite-email.html")
+        if (
+            "email_text" not in config["invite_emails"]
+            or config["invite_emails"]["email_text"] == ""
+        ):
+            log.debug("Using default invite email plaintext template")
+            config["invite_emails"]["email_text"] = str(local_dir / "invite-email.txt")
+        if (
+            "public_server" not in config["jellyfin"]
+            or config["jellyfin"]["public_server"] == ""
+        ):
+            config["jellyfin"]["public_server"] = config["jellyfin"]["server"]
+        if "bs5" not in config["ui"] or config["ui"]["bs5"] == "":
+            config["ui"]["bs5"] = "false"
+        return config
+
+    def __init__(self, file, instance, data_dir, local_dir, log):
+        self.config_path = Path(file)
+        self.data_dir = data_dir
+        self.local_dir = local_dir
+        self.instance = instance
+        self.log = log
+        self.varname = f"JFA_{self.instance}_RELOADCONFIG"
+        os.environ[self.varname] = "true"
+
+    def __getitem__(self, key):
+        if os.environ[self.varname] == "true":
+            self.config = Config.load_config(
+                self.config_path, self.data_dir, self.local_dir, self.log
+            )
+            os.environ[self.varname] = "false"
+        return self.config.__getitem__(key)
+
+    def getboolean(self, sect, key):
+        if os.environ[self.varname] == "true":
+            self.config = Config.load_config(
+                self.config_path, self.data_dir, self.local_dir, self.log
+            )
+            os.environ[self.varname] = "false"
+        return self.config.getboolean(sect, key)
+
+    def trigger_reload(self):
+        os.environ[self.varname] = "true"