How to save the signin state

[alex-user-go]

Hello! I need some help in saving signin state. I could not figure out how not to auth every time I start my app. Is it possible? Could you provide me with a code example?

[quenbyako]

Hey @alex-user-go! Telegram config has SessionFile parameter, in this path mtproto client saves your session. telegram authorization is too unintuitive but here is the simplest explaination: when you connect to tg servers, mtproto client must store specific session credentials, so when you send auth.signIn request, you authorize from specific session, not in your app. (yeah, pretty strange but it is). after your session was authorized, you can send other requests from this session. Hope that i explained you as simple as i can.

Also, telegram doesn't like this way, when you signin'ing many times per short duration, telegram block you for 24+ hours due to spamming. soooo, probably you don't need to authorize this way. I agree that authorization system in tg api is not perfect, but we have what we have.

[alex-user-go]

Thank you for such a quick answer, but still I can't figure it out. After signing in (AuthSignIn) evertything works fine. Then I restart my app, call telegram.NewClient (the same sessionFile) and call, say, AccountInitTakeoutSession I have The key is not registered in the system (code 401). Also I don't get the meaning of this line

mtproto/examples/auth/main.go

Line 49 in c025fd4

if !dry.FileExists(sessionFile) {

as telegram.NewClient always creates a sessionFile (if it didn't exist). Am I right?

[quenbyako]

this is super stupid bug, i'll fix it right now, lol 🤣

[alex-user-go]

And now it will never reach AuthSignIn, cause after telegram.NewClient there is always a sessionFile, right?

[quenbyako]

when you have session.json file (see how utils.PrepareAppStorageForExamples() works), then yes, mtproto object will see that session is exist and will not recreate new session.

[alex-user-go]

Any ideas about error 401?

Thank you for such a quick answer, but still I can't figure it out. After signing in (AuthSignIn) evertything works fine. Then I restart my app, call telegram.NewClient (the same sessionFile) and call, say, AccountInitTakeoutSession I have The key is not registered in the system (code 401). Also I don't get the meaning of this line

mtproto/examples/auth/main.go

Line 49 in c025fd4

if !dry.FileExists(sessionFile) {

as telegram.NewClient always creates a sessionFile (if it didn't exist). Am I right?

[alex-user-go]

If anyone is struggling with this - it turned out that the testhost requires registration even though your phone is registered with a serverhost.

[quenbyako]

no way... 😱😱😱