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use std::sync::Arc;
use fetch::{self, Fetch};
use parity_reactor::Remote;
use hyper::{self, server, net, Next, Encoder, Decoder};
use hyper::status::StatusCode;
use apps;
use endpoint::{Endpoint, Handler, EndpointPath};
use handlers::{
ContentFetcherHandler, ContentHandler, ContentValidator, ValidatorResponse,
StreamingHandler, Redirection, extract_url,
};
use url::Url;
use WebProxyTokens;
pub type Embeddable = Option<(String, u16)>;
pub struct Web<F> {
embeddable_on: Embeddable,
web_proxy_tokens: Arc<WebProxyTokens>,
remote: Remote,
fetch: F,
}
impl<F: Fetch> Web<F> {
pub fn boxed(embeddable_on: Embeddable, web_proxy_tokens: Arc<WebProxyTokens>, remote: Remote, fetch: F) -> Box<Endpoint> {
Box::new(Web {
embeddable_on: embeddable_on,
web_proxy_tokens: web_proxy_tokens,
remote: remote,
fetch: fetch,
})
}
}
impl<F: Fetch> Endpoint for Web<F> {
fn to_async_handler(&self, path: EndpointPath, control: hyper::Control) -> Box<Handler> {
Box::new(WebHandler {
control: control,
state: State::Initial,
path: path,
remote: self.remote.clone(),
fetch: self.fetch.clone(),
web_proxy_tokens: self.web_proxy_tokens.clone(),
embeddable_on: self.embeddable_on.clone(),
})
}
}
struct WebInstaller {
embeddable_on: Embeddable,
referer: String,
}
impl ContentValidator for WebInstaller {
type Error = String;
fn validate_and_install(&self, response: fetch::Response) -> Result<ValidatorResponse, String> {
let status = StatusCode::from_u16(response.status().to_u16());
let is_html = response.is_html();
let mime = response.content_type().unwrap_or(mime!(Text/Html));
let mut handler = StreamingHandler::new(
response,
status,
mime,
self.embeddable_on.clone(),
);
if is_html {
handler.set_initial_content(&format!(
r#"<script src="/{}/inject.js"></script><script>history.replaceState({{}}, "", "/?{}{}")</script>"#,
apps::UTILS_PATH,
apps::URL_REFERER,
&self.referer,
));
}
Ok(ValidatorResponse::Streaming(handler))
}
}
enum State<F: Fetch> {
Initial,
Error(ContentHandler),
Redirecting(Redirection),
Fetching(ContentFetcherHandler<WebInstaller, F>),
}
struct WebHandler<F: Fetch> {
control: hyper::Control,
state: State<F>,
path: EndpointPath,
remote: Remote,
fetch: F,
web_proxy_tokens: Arc<WebProxyTokens>,
embeddable_on: Embeddable,
}
impl<F: Fetch> WebHandler<F> {
fn extract_target_url(&self, url: Option<Url>) -> Result<(String, String), State<F>> {
let (path, query) = match url {
Some(url) => (url.path, url.query),
None => {
return Err(State::Error(ContentHandler::error(
StatusCode::BadRequest, "Invalid URL", "Couldn't parse URL", None, self.embeddable_on.clone()
)));
}
};
let idx = match path.get(0).map(|m| m.as_ref()) {
Some(apps::WEB_PATH) => 1,
_ => 0,
};
match path.get(idx) {
Some(ref token) if self.web_proxy_tokens.is_web_proxy_token_valid(token) => {},
_ => {
return Err(State::Error(ContentHandler::error(
StatusCode::BadRequest, "Invalid Access Token", "Invalid or old web proxy access token supplied.", Some("Try refreshing the page."), self.embeddable_on.clone()
)));
}
}
let protocol = match path.get(idx + 1).map(|a| a.as_str()) {
Some("http") => "http",
Some("https") => "https",
_ => {
return Err(State::Error(ContentHandler::error(
StatusCode::BadRequest, "Invalid Protocol", "Invalid protocol used.", None, self.embeddable_on.clone()
)));
}
};
if let None = path.get(idx + 3) {
return Err(State::Redirecting(
Redirection::new(&format!("/{}/", path.join("/")))
));
}
let query = match query {
Some(query) => format!("?{}", query),
None => "".into(),
};
Ok((format!("{}://{}{}", protocol, path[idx + 2..].join("/"), query), path[0..].join("/")))
}
}
impl<F: Fetch> server::Handler<net::HttpStream> for WebHandler<F> {
fn on_request(&mut self, request: server::Request<net::HttpStream>) -> Next {
let url = extract_url(&request);
let (target_url, referer) = match self.extract_target_url(url) {
Ok(url) => url,
Err(error) => {
self.state = error;
return Next::write();
}
};
let mut handler = ContentFetcherHandler::new(
target_url,
self.path.clone(),
self.control.clone(),
WebInstaller {
embeddable_on: self.embeddable_on.clone(),
referer: referer,
},
self.embeddable_on.clone(),
self.remote.clone(),
self.fetch.clone(),
);
let res = handler.on_request(request);
self.state = State::Fetching(handler);
res
}
fn on_request_readable(&mut self, decoder: &mut Decoder<net::HttpStream>) -> Next {
match self.state {
State::Initial => Next::end(),
State::Error(ref mut handler) => handler.on_request_readable(decoder),
State::Redirecting(ref mut handler) => handler.on_request_readable(decoder),
State::Fetching(ref mut handler) => handler.on_request_readable(decoder),
}
}
fn on_response(&mut self, res: &mut server::Response) -> Next {
match self.state {
State::Initial => Next::end(),
State::Error(ref mut handler) => handler.on_response(res),
State::Redirecting(ref mut handler) => handler.on_response(res),
State::Fetching(ref mut handler) => handler.on_response(res),
}
}
fn on_response_writable(&mut self, encoder: &mut Encoder<net::HttpStream>) -> Next {
match self.state {
State::Initial => Next::end(),
State::Error(ref mut handler) => handler.on_response_writable(encoder),
State::Redirecting(ref mut handler) => handler.on_response_writable(encoder),
State::Fetching(ref mut handler) => handler.on_response_writable(encoder),
}
}
}