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use std::sync::Arc;
use unicase::UniCase;
use hyper::{server, net, Decoder, Encoder, Next, Control};
use hyper::header;
use hyper::method::Method;
use hyper::header::AccessControlAllowOrigin;
use api::types::{App, ApiError};
use api::response;
use apps::fetcher::Fetcher;
use handlers::extract_url;
use endpoint::{Endpoint, Endpoints, Handler, EndpointPath};
use jsonrpc_http_server::cors;
#[derive(Clone)]
pub struct RestApi {
cors_domains: Option<Vec<AccessControlAllowOrigin>>,
endpoints: Arc<Endpoints>,
fetcher: Arc<Fetcher>,
}
impl RestApi {
pub fn new(cors_domains: Vec<String>, endpoints: Arc<Endpoints>, fetcher: Arc<Fetcher>) -> Box<Endpoint> {
Box::new(RestApi {
cors_domains: Some(cors_domains.into_iter().map(AccessControlAllowOrigin::Value).collect()),
endpoints: endpoints,
fetcher: fetcher,
})
}
fn list_apps(&self) -> Vec<App> {
self.endpoints.iter().filter_map(|(ref k, ref e)| {
e.info().map(|ref info| App::from_info(k, info))
}).collect()
}
}
impl Endpoint for RestApi {
fn to_async_handler(&self, path: EndpointPath, control: Control) -> Box<Handler> {
Box::new(RestApiRouter::new(self.clone(), path, control))
}
}
struct RestApiRouter {
api: RestApi,
origin: Option<String>,
path: Option<EndpointPath>,
control: Option<Control>,
handler: Box<Handler>,
}
impl RestApiRouter {
fn new(api: RestApi, path: EndpointPath, control: Control) -> Self {
RestApiRouter {
path: Some(path),
origin: None,
control: Some(control),
api: api,
handler: response::as_json_error(&ApiError {
code: "404".into(),
title: "Not Found".into(),
detail: "Resource you requested has not been found.".into(),
}),
}
}
fn resolve_content(&self, hash: Option<&str>, path: EndpointPath, control: Control) -> Option<Box<Handler>> {
match hash {
Some(hash) if self.api.fetcher.contains(hash) => {
Some(self.api.fetcher.to_async_handler(path, control))
},
_ => None
}
}
fn response_headers(&self) -> header::Headers {
let mut headers = header::Headers::new();
headers.set(header::AccessControlAllowCredentials);
headers.set(header::AccessControlAllowMethods(vec![
Method::Options,
Method::Post,
Method::Get,
]));
headers.set(header::AccessControlAllowHeaders(vec![
UniCase("origin".to_owned()),
UniCase("content-type".to_owned()),
UniCase("accept".to_owned()),
]));
if let Some(cors_header) = cors::get_cors_header(&self.api.cors_domains, &self.origin) {
headers.set(cors_header);
}
headers
}
}
impl server::Handler<net::HttpStream> for RestApiRouter {
fn on_request(&mut self, request: server::Request<net::HttpStream>) -> Next {
self.origin = cors::read_origin(&request);
if let Method::Options = *request.method() {
self.handler = response::empty();
return Next::write();
}
let url = extract_url(&request);
if url.is_none() {
return Next::write();
}
let url = url.expect("Check for None early-exists above; qed");
let mut path = self.path.take().expect("on_request called only once, and path is always defined in new; qed");
let control = self.control.take().expect("on_request called only once, and control is always defined in new; qed");
let endpoint = url.path.get(1).map(|v| v.as_str());
let hash = url.path.get(2).map(|v| v.as_str());
if let Some(ref hash) = hash { path.app_id = hash.clone().to_owned() }
let handler = endpoint.and_then(|v| match v {
"apps" => Some(response::as_json(&self.api.list_apps())),
"ping" => Some(response::ping()),
"content" => self.resolve_content(hash, path, control),
_ => None
});
if let Some(h) = handler {
self.handler = h;
}
self.handler.on_request(request)
}
fn on_request_readable(&mut self, decoder: &mut Decoder<net::HttpStream>) -> Next {
self.handler.on_request_readable(decoder)
}
fn on_response(&mut self, res: &mut server::Response) -> Next {
*res.headers_mut() = self.response_headers();
self.handler.on_response(res)
}
fn on_response_writable(&mut self, encoder: &mut Encoder<net::HttpStream>) -> Next {
self.handler.on_response_writable(encoder)
}
}