98 lines
3.3 KiB
Rust
98 lines
3.3 KiB
Rust
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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use std::sync::Arc;
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use hyper;
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use ethcore_rpc::{Metadata, Origin};
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use jsonrpc_core::{Middleware, MetaIoHandler};
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use jsonrpc_http_server::{self as http, AccessControlAllowOrigin, HttpMetaExtractor};
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use jsonrpc_http_server::tokio_core::reactor::Remote;
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use endpoint::{Endpoint, EndpointPath, Handler};
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pub fn rpc<T: Middleware<Metadata>>(
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handler: MetaIoHandler<Metadata, T>,
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remote: Remote,
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cors_domains: Vec<AccessControlAllowOrigin>,
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) -> Box<Endpoint> {
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Box::new(RpcEndpoint {
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handler: Arc::new(handler),
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remote: remote,
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meta_extractor: Arc::new(MetadataExtractor),
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cors_domain: Some(cors_domains),
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// NOTE [ToDr] We don't need to do any hosts validation here. It's already done in router.
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allowed_hosts: None,
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})
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}
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struct RpcEndpoint<T: Middleware<Metadata>> {
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handler: Arc<MetaIoHandler<Metadata, T>>,
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remote: Remote,
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meta_extractor: Arc<HttpMetaExtractor<Metadata>>,
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cors_domain: Option<Vec<AccessControlAllowOrigin>>,
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allowed_hosts: Option<Vec<http::Host>>,
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}
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impl<T: Middleware<Metadata>> Endpoint for RpcEndpoint<T> {
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fn to_async_handler(&self, _path: EndpointPath, control: hyper::Control) -> Box<Handler> {
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Box::new(http::ServerHandler::new(
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http::Rpc {
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handler: self.handler.clone(),
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remote: self.remote.clone(),
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extractor: self.meta_extractor.clone(),
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},
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self.cors_domain.clone(),
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self.allowed_hosts.clone(),
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Arc::new(NoopMiddleware),
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control,
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))
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}
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}
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#[derive(Default)]
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struct NoopMiddleware;
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impl http::RequestMiddleware for NoopMiddleware {
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fn on_request(&self, request: &http::hyper::server::Request<http::hyper::net::HttpStream>) -> http::RequestMiddlewareAction {
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http::RequestMiddlewareAction::Proceed {
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should_continue_on_invalid_cors: request.headers().get::<http::hyper::header::Origin>().is_none(),
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}
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}
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}
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struct MetadataExtractor;
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impl HttpMetaExtractor<Metadata> for MetadataExtractor {
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fn read_metadata(&self, request: &http::hyper::server::Request<http::hyper::net::HttpStream>) -> Metadata {
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let dapp_id = request.headers().get::<http::hyper::header::Origin>()
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.map(|origin| format!("{}://{}", origin.scheme, origin.host))
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.or_else(|| {
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// fallback to custom header, but only if origin is null
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request.headers().get_raw("origin")
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.and_then(|raw| raw.one())
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.and_then(|raw| if raw == "null".as_bytes() {
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request.headers().get_raw("x-parity-origin")
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.and_then(|raw| raw.one())
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.map(|raw| String::from_utf8_lossy(raw).into_owned())
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} else {
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None
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})
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});
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Metadata {
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origin: Origin::Dapps(dapp_id.map(Into::into).unwrap_or_default()),
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}
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}
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}
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