feat: install wizard on first launch (#1977)

* Login form loading

* add first install middleware and settings

* updates

* Login form loading

* add first install middleware and settings

* updates

* only set first install when superuser is created

* refactor first install

* only show if first install

* cleanup

* set password

* update calls

* login superuser on first install

* fix

* fixup!

* fixup!

* fixup!

* fixup!

* fixup!

* last fixup!

* fix mypy and prettier CI errors

* disable first install

* add random super user

* set first install after startup

* remove user id from form

* Update lnbits/core/views/auth_api.py

Co-authored-by: Vlad Stan <stan.v.vlad@gmail.com>

* Update lnbits/core/views/auth_api.py

Co-authored-by: Vlad Stan <stan.v.vlad@gmail.com>

* Update lnbits/middleware.py

Co-authored-by: dni ⚡ <office@dnilabs.com>

* addressing Vlad's comments

* remove super user

* move to transient settings

* fix: show `first_install` page even after a server restart

* fix: do not add `user_id` in the auth token

* fix: `make check` errors

* fix: `username` is not optional for `UpdateSuperuserPassword`

* feat: nicer error message

---------

Co-authored-by: dni ⚡ <office@dnilabs.com>
Co-authored-by: Tiago Vasconcelos <talvasconcelos@gmail.com>
Co-authored-by: Vlad Stan <stan.v.vlad@gmail.com>

lnbits/core/views/auth_api.py

@@ -38,6 +38,7 @@ from ..models import (
     CreateUser,
     LoginUsernamePassword,
     LoginUsr,
+    UpdateSuperuserPassword,
     UpdateUser,
     UpdateUserPassword,
     User,
@@ -250,6 +251,34 @@ async def update(
         raise HTTPException(HTTP_500_INTERNAL_SERVER_ERROR, "Cannot update user.")
 
 
+@auth_router.put("/api/v1/auth/first_install")
+async def first_install(data: UpdateSuperuserPassword) -> JSONResponse:
+    if not settings.first_install:
+        raise HTTPException(HTTP_401_UNAUTHORIZED, "This is not your first install")
+    try:
+        await update_account(
+            user_id=settings.super_user,
+            username=data.username,
+            user_config=UserConfig(provider="lnbits"),
+        )
+        super_user = UpdateUserPassword(
+            user_id=settings.super_user,
+            password=data.password,
+            password_repeat=data.password_repeat,
+            username=data.username,
+        )
+        await update_user_password(super_user)
+        settings.first_install = False
+        return _auth_success_response(username=super_user.username)
+    except AssertionError as e:
+        raise HTTPException(HTTP_403_FORBIDDEN, str(e))
+    except Exception as e:
+        logger.debug(e)
+        raise HTTPException(
+            HTTP_500_INTERNAL_SERVER_ERROR, "Cannot update user password."
+        )
+
+
 async def _handle_sso_login(userinfo: OpenID, verified_user_id: Optional[str] = None):
     email = userinfo.email
     if not email or not is_valid_email_address(email):