octocrate 0.1.6

A library of github API
Documentation 
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use chrono::{DateTime, Utc};
use jsonwebtoken::{encode, Algorithm, EncodingKey, Header};
use octocrate_infra::{ExpirableToken, GithubError};
use serde::{Deserialize, Serialize};

#[derive(Serialize, Deserialize, Debug)]
pub struct GithubTokenPayload {
  iat: i64,
  exp: i64,
  iss: String,
}

#[derive(Debug, Clone)]
pub struct GithubInstallationToken {
  token: String,
  #[allow(dead_code)]
  expires_at: DateTime<Utc>,
}

#[derive(Debug, Clone)]
pub struct GithubInstallationExpirableToken {
  github_app_id: String,
  github_app_private_key: String,
}

impl GithubInstallationExpirableToken {
  pub fn new(github_app_id: String, github_app_private_key: String) -> Self {
    Self {
      github_app_id,
      github_app_private_key,
    }
  }

  fn generate_token(&self) -> Result<GithubInstallationToken, GithubError> {
    let now = chrono::Utc::now().timestamp();
    let expires_at = chrono::Utc::now() + chrono::Duration::seconds(60);
    let payload = GithubTokenPayload {
      iat: now,
      exp: expires_at.timestamp(),
      iss: self.github_app_id.clone(),
    };
    let token = encode(
      &Header::new(Algorithm::RS256),
      &payload,
      &EncodingKey::from_rsa_pem(self.github_app_private_key.as_bytes()).unwrap(),
    )?;

    Ok(GithubInstallationToken { token, expires_at })
  }
}

impl ExpirableToken for GithubInstallationExpirableToken {
  fn is_expired(&self) -> bool {
    true
  }

  fn get_token(&self) -> Option<String> {
    match self.generate_token() {
      Ok(token) => Some(token.token),
      Err(_) => None,
    }
  }
}