Function get_credential_from_reader 

pub fn get_credential_from_reader(
    reader: impl Read,
    server: &str,
) -> Result<DockerCredential, CredentialRetrievalError>

Retrieve a user’s docker credential from a given reader.

Example:

use std::{fs::File, io::BufReader};
use docker_credential::DockerCredential;

let file = File::open("config.json").expect("Unable to open config file");

let reader = BufReader::new(file);

let credential = docker_credential::get_credential_from_reader(reader, "https://index.docker.io/v1/").expect("Unable to retrieve credential");

match credential {
  DockerCredential::IdentityToken(token) => println!("Identity token: {}", token),
  DockerCredential::UsernamePassword(user_name, password) => println!("Username: {}, Password: {}", user_name, password),
};