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use time::{self, Duration};
use hyper::header;
use hyper::server;
use hyper::uri::RequestUri;
use hyper::net::HttpStream;
use hyper::status::StatusCode;
use hyper::{Decoder, Encoder, Next};
use endpoint::EndpointPath;
use handlers::{ContentHandler, add_security_headers};
pub trait DappFile: Send {
fn content_type(&self) -> &str;
fn is_drained(&self) -> bool;
fn next_chunk(&mut self) -> &[u8];
fn bytes_written(&mut self, bytes: usize);
}
pub trait Dapp: Send + 'static {
type DappFile: DappFile;
fn file(&self, path: &str) -> Option<Self::DappFile>;
}
pub enum ServedFile<T: Dapp> {
File(T::DappFile),
Error(ContentHandler),
}
impl<T: Dapp> ServedFile<T> {
pub fn new(embeddable_on: Option<(String, u16)>) -> Self {
ServedFile::Error(ContentHandler::error(
StatusCode::NotFound,
"404 Not Found",
"Requested dapp resource was not found.",
None,
embeddable_on,
))
}
}
#[derive(Debug, Copy, Clone, PartialEq)]
pub enum PageCache {
Enabled,
Disabled,
}
impl Default for PageCache {
fn default() -> Self {
PageCache::Disabled
}
}
pub trait PageHandlerWaiting: server::Handler<HttpStream> + Send {
fn set_uri(&mut self, uri: &RequestUri);
}
pub struct PageHandler<T: Dapp> {
pub app: T,
pub file: ServedFile<T>,
pub prefix: Option<String>,
pub path: EndpointPath,
pub safe_to_embed_on: Option<(String, u16)>,
pub cache: PageCache,
}
impl<T: Dapp> PageHandlerWaiting for PageHandler<T> {
fn set_uri(&mut self, uri: &RequestUri) {
trace!(target: "dapps", "Setting URI: {:?}", uri);
self.file = match *uri {
RequestUri::AbsolutePath { ref path, .. } => {
self.app.file(&self.extract_path(path))
},
RequestUri::AbsoluteUri(ref url) => {
self.app.file(&self.extract_path(url.path()))
},
_ => None,
}.map_or_else(|| ServedFile::new(self.safe_to_embed_on.clone()), |f| ServedFile::File(f));
}
}
impl<T: Dapp> PageHandler<T> {
fn extract_path(&self, path: &str) -> String {
let app_id = &self.path.app_id;
let prefix = "/".to_owned() + self.prefix.as_ref().unwrap_or(app_id);
let prefix_with_slash = prefix.clone() + "/";
let query_pos = path.find('?').unwrap_or_else(|| path.len());
match path == "/" || path == &prefix || path == &prefix_with_slash {
true => "index.html".to_owned(),
false => if path.starts_with(&prefix_with_slash) {
path[prefix_with_slash.len()..query_pos].to_owned()
} else if path.starts_with("/") {
path[1..query_pos].to_owned()
} else {
path[0..query_pos].to_owned()
}
}
}
}
impl<T: Dapp> server::Handler<HttpStream> for PageHandler<T> {
fn on_request(&mut self, req: server::Request<HttpStream>) -> Next {
self.set_uri(req.uri());
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 {
match self.file {
ServedFile::File(ref f) => {
res.set_status(StatusCode::Ok);
if let PageCache::Enabled = self.cache {
let mut headers = res.headers_mut();
let validity = Duration::days(365);
headers.set(header::CacheControl(vec![
header::CacheDirective::Public,
header::CacheDirective::MaxAge(validity.num_seconds() as u32),
]));
headers.set(header::Expires(header::HttpDate(time::now() + validity)));
}
match f.content_type().parse() {
Ok(mime) => res.headers_mut().set(header::ContentType(mime)),
Err(()) => debug!(target: "dapps", "invalid MIME type: {}", f.content_type()),
}
add_security_headers(&mut res.headers_mut(), self.safe_to_embed_on.clone());
Next::write()
},
ServedFile::Error(ref mut handler) => {
handler.on_response(res)
}
}
}
fn on_response_writable(&mut self, encoder: &mut Encoder<HttpStream>) -> Next {
match self.file {
ServedFile::Error(ref mut handler) => handler.on_response_writable(encoder),
ServedFile::File(ref f) if f.is_drained() => Next::end(),
ServedFile::File(ref mut f) => match encoder.write(f.next_chunk()) {
Ok(bytes) => {
f.bytes_written(bytes);
Next::write()
},
Err(e) => match e.kind() {
::std::io::ErrorKind::WouldBlock => Next::write(),
_ => Next::end(),
},
}
}
}
}
#[cfg(test)]
mod test {
use super::*;
pub struct TestWebAppFile;
impl DappFile for TestWebAppFile {
fn content_type(&self) -> &str {
unimplemented!()
}
fn is_drained(&self) -> bool {
unimplemented!()
}
fn next_chunk(&mut self) -> &[u8] {
unimplemented!()
}
fn bytes_written(&mut self, _bytes: usize) {
unimplemented!()
}
}
#[derive(Default)]
pub struct TestWebapp;
impl Dapp for TestWebapp {
type DappFile = TestWebAppFile;
fn file(&self, _path: &str) -> Option<Self::DappFile> {
None
}
}
}
#[test]
fn should_extract_path_with_appid() {
let path1 = "/";
let path2= "/test.css";
let path3 = "/app/myfile.txt";
let path4 = "/app/myfile.txt?query=123";
let page_handler = PageHandler {
app: test::TestWebapp,
prefix: None,
path: EndpointPath {
app_id: "app".to_owned(),
host: "".to_owned(),
port: 8080,
using_dapps_domains: true,
},
file: ServedFile::new(None),
cache: Default::default(),
safe_to_embed_on: None,
};
let res1 = page_handler.extract_path(path1);
let res2 = page_handler.extract_path(path2);
let res3 = page_handler.extract_path(path3);
let res4 = page_handler.extract_path(path4);
assert_eq!(&res1, "index.html");
assert_eq!(&res2, "test.css");
assert_eq!(&res3, "myfile.txt");
assert_eq!(&res4, "myfile.txt");
}