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