google oauth2 refresh token

[mrdotb]

Hello, thanks for the library.

I encounter a problem. I'm making a cmd line app who use googlecloudapi. I want to cache the token and refresh it each time the app is launched.
My problem is google do not send a new refresh_token or the previous one when you renew. So the lib erase the old refresh_token field. So my idea was to manually call set_refresh_token but I can't access the refresh_token field.

fn cache(token: BasicTokenResponse) -> Result<BasicTokenResponse, TokenError> {
    // Save serialized token
    let serialized_json = serde_json::to_string(&token)?;
    let mut file = File::create("token.json")?;
    file.write_all(serialized_json.as_bytes())?;
    Ok(token)
}

fn check_cache() -> Result<BasicTokenResponse, TokenError> {
    let mut file = File::open("token.json")?;
    let mut serialized_json = String::new();

    file.read_to_string(&mut serialized_json)?;
    let token: BasicTokenResponse = serde_json::from_str(&serialized_json)?;

    let refresh_token = token.refresh_token().unwrap();
    let mut fresh_token = create_client()?
        .exchange_refresh_token(refresh_token)
        .unwrap();


    if fresh_token.access_token().secret() != token.access_token().secret() {
        //Set the previous refresh_token
        fresh_token.set_refresh_token(Some(RefreshToken::new("ccc".to_string())));
        cache(fresh_token)
    } else {
        Ok(token)
    }
}

Call result

// First call
{
  "access_token": "XXXXXXX",
  "token_type": "bearer",
  "expires_in": 3600,
  "refresh_token": "XXXXXXX",
  "scope": "https://www.googleapis.com/auth/drive https://www.googleapis.com/auth/documents"
}
// Using the refresh token
{
  "access_token": "XXXXXXX",
  "token_type": "bearer",
  "expires_in": 3600,
  "scope": "https://www.googleapis.com/auth/drive https://www.googleapis.com/auth/documents"
}

[ramosbugs]

does this work?

fresh_token.set_refresh_token(Some(refresh_token));

I don't fully understand the but I can't access the refresh_token field part of your question. The (old) refresh token is already in scope above in a variable called refresh_token.

[mrdotb]

Thanks for the fast answer. This is my first project with rust.
No it does not work.
refresh_token fn give me a reference (&RefreshToken) but the set function want a RefreshToken.
Is it possible to access the string behind &RefreshToken ?
From the lib

pub fn refresh_token(&self) -> Option<&RefreshToken> {
    self.refresh_token.as_ref()
 }

 pub fn set_refresh_token(&mut self, refresh_token: Option<RefreshToken>) {
   self.refresh_token = refresh_token;
 }

[ramosbugs]

oh I see. I think what you want to do here is clone the refresh token since set_refresh_token() needs an owned value. RefreshToken implements Clone, so you should just be able to do:

fresh_token.set_refresh_token(Some(refresh_token.clone()));

[mrdotb]

Thanks for your help
I reread rust doc about references and borrowing and just find it worked with to_owned()
fresh_token.set_refresh_token(Some(refresh_token.to_owned()));