Add account manager and the account page is now fully functional.

Fix "Missing javaVersion" error when launching legacy Minecraft.

Add settings page. (But is not fully implemented yet)

core_lib/common/common.py

@@ -1,4 +1,6 @@
 from __future__ import annotations
+
+import base64
 import hashlib
 import logging
 import platform
@@ -304,4 +306,24 @@ def is_valid_zipfile(path: Path) -> bool:
     try:
         return zipfile.is_zipfile(path)
     except OSError:
-        return False
+        return False
+
+def bytes_to_data_url(image_data: bytes,  mime_type: str = "image/png",) -> str:
+    """
+    Convert raw image bytes to a Base64 Data URL.
+    :param image_data:
+    :param mime_type:
+    :return:
+        data_url: str
+    """
+    if not isinstance(image_data, bytes):
+        raise TypeError("image_data must be bytes")
+
+    if not image_data:
+        raise ValueError("image_data cannot be empty")
+
+    if not isinstance(mime_type, str) or not mime_type.startswith("image/"):
+        raise ValueError("mime_type must be a valid image MIME type")
+
+    encoded = base64.b64encode(image_data).decode("ascii")
+    return f"data:{mime_type};base64,{encoded}"

core_lib/common/exception.py

@@ -86,4 +86,28 @@ class ProfileLoadException(LauncherException):
     user_message = "Unable to load profile. Profile may corrupted"
 
 class ProfileKeyNotFoundException(LauncherException):
-    user_message = "Specified profile key not found. Profile may corrupted."
+    user_message = "Specified profile key not found. Profile may corrupted."
+
+class AccountException(LauncherException):
+    user_message = "An error occurred while processing account data."
+
+class AccountSaveException(AccountException):
+    user_message = "Unable to save account data. Try again later."
+
+class AccountLoadException(AccountException):
+    user_message = "Unable to load account data. The account file may be corrupted."
+
+class AccountKeyNotFoundException(AccountException):
+    user_message = "Specified account was not found."
+
+class AuthenticationException(LauncherException):
+    user_message = "Authentication failed."
+
+class AuthenticationConnectException(LauncherException):
+    user_message = "An error occurred while connecting to authentication server."
+
+class AuthenticationSessionException(LauncherException):
+    user_message = "Authentication failed. Session may expire."
+
+class ThirdPartyAPIException(LauncherException):
+    user_message = "An error occurred while fetching third party API."