openethereum/dapps/src/handlers/content.rs

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// Copyright 2015-2017 Parity Technologies (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
//! Simple Content Handler
use hyper::{header, server, Decoder, Encoder, Next};
use hyper::net::HttpStream;
use hyper::mime::Mime;
use hyper::status::StatusCode;
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use util::version;
use handlers::add_security_headers;
#[derive(Clone)]
pub struct ContentHandler {
code: StatusCode,
content: String,
mimetype: Mime,
write_pos: usize,
safe_to_embed_on: Option<(String, u16)>,
}
impl ContentHandler {
pub fn ok(content: String, mimetype: Mime) -> Self {
Self::new(StatusCode::Ok, content, mimetype)
}
pub fn not_found(content: String, mimetype: Mime) -> Self {
Self::new(StatusCode::NotFound, content, mimetype)
}
pub fn html(code: StatusCode, content: String, embeddable_on: Option<(String, u16)>) -> Self {
Self::new_embeddable(code, content, mime!(Text/Html), embeddable_on)
}
pub fn error(code: StatusCode, title: &str, message: &str, details: Option<&str>, embeddable_on: Option<(String, u16)>) -> Self {
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Self::html(code, format!(
include_str!("../error_tpl.html"),
title=title,
message=message,
details=details.unwrap_or_else(|| ""),
version=version(),
), embeddable_on)
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}
pub fn new(code: StatusCode, content: String, mimetype: Mime) -> Self {
Self::new_embeddable(code, content, mimetype, None)
}
pub fn new_embeddable(code: StatusCode, content: String, mimetype: Mime, embeddable_on: Option<(String, u16)>) -> Self {
ContentHandler {
code: code,
content: content,
mimetype: mimetype,
write_pos: 0,
safe_to_embed_on: embeddable_on,
}
}
}
impl server::Handler<HttpStream> for ContentHandler {
fn on_request(&mut self, _request: server::Request<HttpStream>) -> Next {
Next::write()
}
fn on_request_readable(&mut self, _decoder: &mut Decoder<HttpStream>) -> Next {
Next::write()
}
fn on_response(&mut self, res: &mut server::Response) -> Next {
res.set_status(self.code);
res.headers_mut().set(header::ContentType(self.mimetype.clone()));
add_security_headers(&mut res.headers_mut(), self.safe_to_embed_on.clone());
Next::write()
}
fn on_response_writable(&mut self, encoder: &mut Encoder<HttpStream>) -> Next {
let bytes = self.content.as_bytes();
if self.write_pos == bytes.len() {
return Next::end();
}
match encoder.write(&bytes[self.write_pos..]) {
Ok(bytes) => {
self.write_pos += bytes;
Next::write()
},
Err(e) => match e.kind() {
::std::io::ErrorKind::WouldBlock => Next::write(),
_ => Next::end()
},
}
}
}