1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126

pub mod response;

pub use client::response::*;
pub use tokio_service::Service;

use std::{
    fmt,
};
use hyper::{
    Request,
    StatusCode,
    Body,
    client::{Client as HttpClient, HttpConnector},
};
use http::{
    header::{AUTHORIZATION, CONTENT_TYPE, CONTENT_LENGTH, RETRY_AFTER},
};
use futures::{
    Future,
    Poll,
    future::{ok, err},
    stream::Stream,
};

use message::Message;
use hyper_tls::{self, HttpsConnector};
use serde_json;

pub struct Client {
    http_client: HttpClient<HttpsConnector<HttpConnector>>,
}

pub struct FutureResponse(Box<Future<Item=FcmResponse, Error=FcmError> + 'static + Send>);

impl fmt::Debug for FutureResponse {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.pad("Future<FcmResponse>")
    }
}

impl Future for FutureResponse {
    type Item = FcmResponse;
    type Error = FcmError;

    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
        self.0.poll()
    }
}

impl Client {
    /// Get a new instance of 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(4).unwrap()),
        })
    }

    pub fn send(&self, message: Message) -> FutureResponse {
        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 send_request = self
            .http_client
            .request(request)
            .map_err(|_| {
                response::FcmError::ServerError(None)
            });

        let fcm_f = send_request.and_then(move |response| {
            let response_status = response.status().clone();
            let retry_after = response.headers()
                .get(RETRY_AFTER)
                .and_then(|ra| ra.to_str().ok())
                .and_then(|ra| RetryAfter::from_str(ra));

            response
                .into_body()
                .map_err(|_| {
                    response::FcmError::ServerError(None)
                })
                .concat2()
                .and_then(move |body_chunk| {
                    if let Ok(body) = String::from_utf8(body_chunk.to_vec()) {
                        match response_status {
                            StatusCode::OK => {
                                let fcm_response: FcmResponse = serde_json::from_str(&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()))
                        }
                    } else {
                        err(response::FcmError::InvalidMessage("Unknown Error".to_string()))
                    }
                })
        });

        FutureResponse(Box::new(fcm_f))
    }
}