openethereum/rpc/src/http_common.rs

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// Copyright 2015-2019 Parity Technologies (UK) Ltd.
// This file is part of Parity Ethereum.
// Parity Ethereum 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 Ethereum 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 Ethereum. If not, see <http://www.gnu.org/licenses/>.
//! Transport-specific metadata extractors.
use jsonrpc_core;
use http;
use hyper;
/// HTTP RPC server impl-independent metadata extractor
pub trait HttpMetaExtractor: Send + Sync + 'static {
/// Type of Metadata
type Metadata: jsonrpc_core::Metadata;
/// Extracts metadata from given params.
fn read_metadata(&self, origin: Option<String>, user_agent: Option<String>) -> Self::Metadata;
}
pub struct MetaExtractor<T> {
extractor: T,
}
impl<T> MetaExtractor<T> {
pub fn new(extractor: T) -> Self {
MetaExtractor { extractor }
}
}
impl<M, T> http::MetaExtractor<M> for MetaExtractor<T> where
T: HttpMetaExtractor<Metadata = M>,
M: jsonrpc_core::Metadata,
{
fn read_metadata(&self, req: &hyper::Request<hyper::Body>) -> M {
let as_string = |header: Option<&hyper::header::HeaderValue>| {
header.and_then(|val| val.to_str().ok().map(|s| s.to_owned()))
};
let origin = as_string(req.headers().get("origin"));
let user_agent = as_string(req.headers().get("user-agent"));
self.extractor.read_metadata(origin, user_agent)
}
}