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pub mod response;
pub use crate::client::response::*;
use futures::stream::TryStreamExt;
use http::header::{AUTHORIZATION, CONTENT_LENGTH, CONTENT_TYPE, RETRY_AFTER};
use hyper::{
client::{Client as HttpClient, HttpConnector},
Body, Request, StatusCode,
};
use hyper_tls::{self, HttpsConnector};
use crate::message::Message;
use serde_json;
pub struct Client {
http_client: HttpClient<HttpsConnector<HttpConnector>>,
}
impl Client {
pub fn new() -> Result<Client, hyper_tls::Error> {
let mut http_client = HttpClient::builder();
http_client.keep_alive(true);
Ok(Client {
http_client: http_client.build(HttpsConnector::new().unwrap()),
})
}
pub async fn send(&self, message: Message<'_>) -> Result<FcmResponse, FcmError> {
let payload = serde_json::to_vec(&message.body).unwrap();
let mut builder = Request::builder();
builder.method("POST");
builder.header(CONTENT_TYPE, "application/json");
builder.header(
CONTENT_LENGTH,
format!("{}", payload.len() as u64).as_bytes(),
);
builder.header(AUTHORIZATION, format!("key={}", message.api_key).as_bytes());
builder.uri("https://fcm.googleapis.com/fcm/send");
let request = builder.body(Body::from(payload)).unwrap();
let response = self.http_client.request(request).await?;
let response_status = response.status();
let retry_after = response
.headers()
.get(RETRY_AFTER)
.and_then(|ra| ra.to_str().ok())
.and_then(|ra| RetryAfter::from_str(ra));
let body = response.into_body().try_concat().await?;
match response_status {
StatusCode::OK => {
let fcm_response: FcmResponse = serde_json::from_slice(&body).unwrap();
match fcm_response.error {
Some(ErrorReason::Unavailable) => {
Err(response::FcmError::ServerError(retry_after))
}
Some(ErrorReason::InternalServerError) => {
Err(response::FcmError::ServerError(retry_after))
}
_ => Ok(fcm_response),
}
}
StatusCode::UNAUTHORIZED => Err(response::FcmError::Unauthorized),
StatusCode::BAD_REQUEST => Err(response::FcmError::InvalidMessage(
"Bad Request".to_string(),
)),
status if status.is_server_error() => {
Err(response::FcmError::ServerError(retry_after))
}
_ => Err(response::FcmError::InvalidMessage(
"Unknown Error".to_string(),
)),
}
}
}