[feat] install extensions from dir (#2781)

* feat: search ext dir and install
* fix: `upgrade_hash` logic
* chore: clean-up `upgrade_hash` logic
* fix: screen refresh
* fix: ignore non-ext dirs
* fix: ext migration

lnbits/core/models/extensions.py

@@ -169,11 +169,7 @@ class Extension(BaseModel):
             name=ext_info.name,
             short_description=ext_info.short_description,
             tile=ext_info.icon,
-            upgrade_hash=(
-                ext_info.hash
-                if settings.extension_has_been_activated(ext_info.id)
-                else ""
-            ),
+            upgrade_hash=ext_info.hash if ext_info.ext_upgrade_dir.is_dir() else "",
         )
 
 
@@ -551,6 +547,41 @@ class InstallableExtension(BaseModel):
             meta=meta,
         )
 
+    @classmethod
+    def from_ext_dir(cls, ext_id: str) -> Optional[InstallableExtension]:
+        try:
+            conf_path = Path(
+                settings.lnbits_extensions_path, "extensions", ext_id, "config.json"
+            )
+            if not conf_path.is_file():
+                return None
+            with open(conf_path, "r+") as json_file:
+                config_json = json.load(json_file)
+                version = config_json.get("version", "0.0")
+
+                return InstallableExtension(
+                    id=ext_id,
+                    name=config_json.get("name", ext_id),
+                    active=True,
+                    version=version,
+                    short_description=config_json.get("short_description"),
+                    icon=config_json.get("tile"),
+                    meta=ExtensionMeta(
+                        installed_release=ExtensionRelease(
+                            name=ext_id,
+                            version=version,
+                            archive=f"{conf_path}",
+                            source_repo=f"{conf_path}",
+                            min_lnbits_version=config_json.get("min_lnbits_version"),
+                        )
+                    ),
+                )
+
+        except Exception as e:
+            logger.warning(e)
+
+        return None
+
     @classmethod
     async def get_installable_extensions(
         cls,