use crate::json_schema::*; use crate::api_info::*; use crate::api_config::*; use std::fmt; use std::path::{PathBuf}; use std::sync::Arc; use failure::*; use serde_json::{json, Value}; use futures::future::{self, Either}; //use tokio::prelude::*; //use tokio::timer::Delay; use tokio::fs::File; use tokio_codec; //use bytes::{BytesMut, BufMut}; //use hyper::body::Payload; use hyper::http::request::Parts; use hyper::{Body, Request, Response, StatusCode}; use hyper::service::{Service, NewService}; use hyper::rt::{Future, Stream}; use hyper::header; pub struct RestServer { pub api_config: Arc, } impl RestServer { pub fn new(api_config: ApiConfig) -> Self { Self { api_config: Arc::new(api_config) } } } impl NewService for RestServer { type ReqBody = Body; type ResBody = Body; type Error = hyper::Error; type InitError = hyper::Error; type Service = ApiService; type Future = Box + Send>; fn new_service(&self) -> Self::Future { Box::new(future::ok(ApiService { api_config: self.api_config.clone() })) } } pub struct ApiService { pub api_config: Arc, } impl Service for ApiService { type ReqBody = Body; type ResBody = Body; type Error = hyper::Error; type Future = Box, Error = Self::Error> + Send>; fn call(&mut self, req: Request) -> Self::Future { Box::new(handle_request(self.api_config.clone(), req).then(|result| { match result { Ok(res) => Ok::<_, hyper::Error>(res), Err(err) => { if let Some(apierr) = err.downcast_ref::() { let mut resp = Response::new(Body::from(apierr.message.clone())); *resp.status_mut() = apierr.code; Ok(resp) } else { let mut resp = Response::new(Body::from(err.to_string())); *resp.status_mut() = StatusCode::BAD_REQUEST; Ok(resp) } } } })) } } type BoxFut = Box, Error = failure::Error> + Send>; #[derive(Debug, Fail)] pub struct HttpError { pub code: StatusCode, pub message: String, } impl HttpError { pub fn new(code: StatusCode, message: String) -> Self { HttpError { code, message } } } impl fmt::Display for HttpError { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "Error {}: {}", self.code, self.message) } } macro_rules! http_err { ($status:ident, $msg:expr) => {{ Error::from(HttpError::new(StatusCode::$status, $msg)) }} } fn get_request_parameters_async( info: &'static ApiMethod, parts: Parts, req_body: Body, ) -> Box + Send> { let resp = req_body .map_err(|err| http_err!(BAD_REQUEST, format!("Promlems reading request body: {}", err))) .fold(Vec::new(), |mut acc, chunk| { if acc.len() + chunk.len() < 64*1024 { //fimxe: max request body size? acc.extend_from_slice(&*chunk); Ok(acc) } else { Err(http_err!(BAD_REQUEST, format!("Request body too large"))) } }) .and_then(move |body| { let bytes = String::from_utf8(body.to_vec())?; // why copy?? println!("GOT BODY {:?}", bytes); let mut test_required = true; let mut params = json!({}); if bytes.len() > 0 { params = parse_query_string(&bytes, &info.parameters, true)?; test_required = false; } if let Some(query_str) = parts.uri.query() { let query_params = parse_query_string(query_str, &info.parameters, test_required)?; for (k, v) in query_params.as_object().unwrap() { params[k] = v.clone(); // fixme: why clone()?? } } println!("GOT PARAMS {}", params); Ok(params) }); Box::new(resp) } fn handle_sync_api_request( info: &'static ApiMethod, parts: Parts, req_body: Body, ) -> BoxFut { let params = get_request_parameters_async(info, parts, req_body); let resp = params .and_then(move |params| { println!("GOT PARAMS {}", params); /* let when = Instant::now() + Duration::from_millis(3000); let task = Delay::new(when).then(|_| { println!("A LAZY TASK"); ok(()) }); tokio::spawn(task); */ let res = (info.handler)(params, info)?; Ok(res) }).then(|result| { match result { Ok(ref value) => { let json_str = value.to_string(); Ok(Response::builder() .status(StatusCode::OK) .header(header::CONTENT_TYPE, "application/json") .body(Body::from(json_str))?) } Err(err) => Err(http_err!(BAD_REQUEST, err.to_string())) } }); Box::new(resp) } fn simple_static_file_download(filename: PathBuf) -> BoxFut { Box::new(File::open(filename) .map_err(|err| http_err!(BAD_REQUEST, format!("File open failed: {}", err))) .and_then(|file| { let buf: Vec = Vec::new(); tokio::io::read_to_end(file, buf) .map_err(|err| http_err!(BAD_REQUEST, format!("File read failed: {}", err))) .and_then(|data| Ok(Response::new(data.1.into()))) })) } fn chuncked_static_file_download(filename: PathBuf) -> BoxFut { Box::new(File::open(filename) .map_err(|err| http_err!(BAD_REQUEST, format!("File open failed: {}", err))) .and_then(|file| { let payload = tokio_codec::FramedRead::new(file, tokio_codec::BytesCodec::new()). map(|bytes| { //sigh - howto avoid copy here? or the whole map() ?? hyper::Chunk::from(bytes.to_vec()) }); let body = Body::wrap_stream(payload); // fixme: set content type and other headers Ok(Response::builder() .status(StatusCode::OK) .body(body) .unwrap()) })) } fn handle_static_file_download(filename: PathBuf) -> BoxFut { let response = tokio::fs::metadata(filename.clone()) .map_err(|err| http_err!(BAD_REQUEST, format!("File access problems: {}", err))) .and_then(|metadata| { if metadata.len() < 1024*32 { Either::A(simple_static_file_download(filename)) } else { Either::B(chuncked_static_file_download(filename)) } }); return Box::new(response); } pub fn handle_request(api: Arc, req: Request) -> BoxFut { let (parts, body) = req.into_parts(); let method = parts.method.clone(); let path = parts.uri.path(); // normalize path // do not allow ".", "..", or hidden files ".XXXX" // also remove empty path components let items = path.split('/'); let mut path = String::new(); let mut components = vec![]; for name in items { if name.is_empty() { continue; } if name.starts_with(".") { return Box::new(future::err(http_err!(BAD_REQUEST, "Path contains illegal components.".to_string()))); } path.push('/'); path.push_str(name); components.push(name); } let comp_len = components.len(); println!("REQUEST {} {}", method, path); println!("COMPO {:?}", components); if comp_len >= 1 && components[0] == "api3" { println!("GOT API REQUEST"); if comp_len >= 2 { let format = components[1]; if format != "json" { return Box::new(future::err(http_err!(BAD_REQUEST, format!("Unsupported output format '{}'.", format)))) } if let Some(api_method) = api.find_method(&components[2..], method) { // fixme: handle auth return handle_sync_api_request(api_method, parts, body); } } } else { // not Auth for accessing files! let filename = api.find_alias(&components); return handle_static_file_download(filename); } Box::new(future::err(http_err!(NOT_FOUND, "Path not found.".to_string()))) }