twapi 0.5.2

A simple Twitter library. This is easy for customize.
Documentation 
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//! Application Only Authentication OAuth2
use self::reqwest::header::{HeaderMap, AUTHORIZATION, CONTENT_TYPE};
use super::TwapiError;
use base64;
use reqwest;
use serde_json;

pub fn get_bearer_token(consumer_key: &str, consumer_secret: &str) -> Result<String, TwapiError> {
    let key = base64::encode(&format!("{}:{}", consumer_key, consumer_secret));
    let mut headers = HeaderMap::new();
    headers.insert(AUTHORIZATION, format!("Basic {}", key).parse().unwrap());
    headers.insert(
        CONTENT_TYPE,
        "application/x-www-form-urlencoded;charset=UTF-8"
            .parse()
            .unwrap(),
    );
    let client = reqwest::Client::new();
    let res: serde_json::Value = client
        .post("https://api.twitter.com/oauth2/token")
        .query(&vec![("grant_type", "client_credentials")])
        .headers(headers)
        .send()?
        .json()?;
    Ok(String::from(res["access_token"].as_str().unwrap()))
}