zero4rs 2.0.0

zero4rs is a powerful, pragmatic, and extremely fast web framework for Rust
Documentation 
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use lazy_static::lazy_static;

use crate::commons;

use reqwest::header::AUTHORIZATION;

lazy_static! {
    static ref MAILGUN_FROM_EMAIL: &'static str = "something@gmail.com";
    static ref MAILGUN_BASE_URL: &'static str = "https://api.mailgun.net";
    static ref MAILGUN_DOMAIN: &'static str = "mg.snnmo.com";
    static ref MAILGUN_API_KEY: &'static str = "056ddf7685c99845daf57a341bb0dcae-1111-2182470a";
}

use crate::services::newsletter_service::SubscriberEmail;

#[derive(Clone)]
pub struct EmailClient {
    http_client: reqwest::Client,
    sender: &'static str,
}

#[derive(serde::Serialize, Debug)]
// Lifetime parameters always start with an apostrophe, `'`
struct SendEmailRequest<'a> {
    from: &'a str,
    to: &'a str,
    subject: &'a str,
    html: &'a str,
}

impl Default for EmailClient {
    fn default() -> Self {
        Self {
            http_client: reqwest::Client::new(),
            sender: &MAILGUN_FROM_EMAIL,
        }
    }
}

// curl -v -s --user 'api:YOUR_API_KEY' \
//     https://api.mailgun.net/v3/mg.snnmo.com/messages \
//     -F from='keesh.zhang <keesh.zhang@mg.snnmo.com>' \
//     -F to=chunhui2001@gmail.com \
//     -F to=76920104@qq.com \
//     -F subject='Hello' \
//     -F html='Testing some Mailgun awesomeness!'
impl EmailClient {
    pub fn new() -> Self {
        Self::default()
    }

    pub async fn send_email(
        &self,
        recipient: &SubscriberEmail,
        subject: &str,
        email_body: &str,
    ) -> Result<(), reqwest::Error> {
        let url = format!("{}/v3/{}/messages", *MAILGUN_BASE_URL, *MAILGUN_DOMAIN,);

        // Refactoring: Avoid Unnecessary Memory Allocations
        let request_body = SendEmailRequest {
            from: self.sender,
            to: recipient.as_ref(),
            subject,
            html: email_body,
        };

        let user_basic = commons::base64encode(&format!("api:{}", *MAILGUN_API_KEY));
        // let post_data = commons::urlencoded::<SendEmailRequest>(&request_body);

        self.http_client
            .post(&url)
            .header(AUTHORIZATION, format!("Basic {}", user_basic))
            .form(&request_body)
            .send()
            .await?
            .error_for_status()?;

        Ok(())
    }
}