mirror of https://github.com/ethereum/go-ethereum
rpc: support injecting HTTP headers through context (#26023)
This adds a way to specify HTTP headers per request. Co-authored-by: Martin Holst Swende <martin@swende.se> Co-authored-by: Felix Lange <fjl@twurst.com>pull/26196/head
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// Copyright 2022 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser 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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//
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// The go-ethereum library 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 Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package rpc |
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import ( |
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"context" |
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"net/http" |
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) |
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type mdHeaderKey struct{} |
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// NewContextWithHeaders wraps the given context, adding HTTP headers. These headers will
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// be applied by Client when making a request using the returned context.
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func NewContextWithHeaders(ctx context.Context, h http.Header) context.Context { |
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if len(h) == 0 { |
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// This check ensures the header map set in context will never be nil.
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return ctx |
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} |
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var ctxh http.Header |
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prev, ok := ctx.Value(mdHeaderKey{}).(http.Header) |
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if ok { |
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ctxh = setHeaders(prev.Clone(), h) |
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} else { |
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ctxh = h.Clone() |
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} |
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return context.WithValue(ctx, mdHeaderKey{}, ctxh) |
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} |
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// headersFromContext is used to extract http.Header from context.
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func headersFromContext(ctx context.Context) http.Header { |
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source, _ := ctx.Value(mdHeaderKey{}).(http.Header) |
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return source |
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} |
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// setHeaders sets all headers from src in dst.
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func setHeaders(dst http.Header, src http.Header) http.Header { |
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for key, values := range src { |
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dst[http.CanonicalHeaderKey(key)] = values |
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} |
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return dst |
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} |
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