Trait AccessTokenSource 

pub trait AccessTokenSource: Send + Sync {
    // Required method
    fn access_token<'life0, 'async_trait>(
        &'life0 self,
    ) -> Pin<Box<dyn Future<Output = Result<String, Error>> + Send + 'async_trait>>
       where Self: 'async_trait,
             'life0: 'async_trait;
}

Supplies bearer tokens to BearerAuth.

Implement this for workload identity systems other than Google ADC. Return the raw token without a Bearer prefix.

Required Methods

fn access_token<'life0, 'async_trait>( &'life0 self, ) -> Pin<Box<dyn Future<Output = Result<String, Error>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait,

Fetch a currently usable access token.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors