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header.go
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// Copyright 2021-2024 The Connect Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package connect
import (
"encoding/base64"
"net/http"
)
// EncodeBinaryHeader base64-encodes the data. It always emits unpadded values.
//
// In the Connect, gRPC, and gRPC-Web protocols, binary headers must have keys
// ending in "-Bin".
func EncodeBinaryHeader(data []byte) string {
// gRPC specification says that implementations should emit unpadded values.
return base64.RawStdEncoding.EncodeToString(data)
}
// DecodeBinaryHeader base64-decodes the data. It can decode padded or unpadded
// values. Following usual HTTP semantics, multiple base64-encoded values may
// be joined with a comma. When receiving such comma-separated values, split
// them with [strings.Split] before calling DecodeBinaryHeader.
//
// Binary headers sent using the Connect, gRPC, and gRPC-Web protocols have
// keys ending in "-Bin".
func DecodeBinaryHeader(data string) ([]byte, error) {
if len(data)%4 != 0 {
// Data definitely isn't padded.
return base64.RawStdEncoding.DecodeString(data)
}
// Either the data was padded, or padding wasn't necessary. In both cases,
// the padding-aware decoder works.
return base64.StdEncoding.DecodeString(data)
}
func mergeHeaders(into, from http.Header) {
for key, vals := range from {
if len(vals) == 0 {
// For response trailers, net/http will pre-populate entries
// with nil values based on the "Trailer" header. But if there
// are no actual values for those keys, we skip them.
continue
}
into[key] = append(into[key], vals...)
}
}
// mergeMetdataHeaders merges the metadata headers from the "from" header into
// the "into" header. It skips over non metadata headers that should not be
// propagated from the server to the client.
func mergeMetadataHeaders(into, from http.Header) {
for key, vals := range from {
if len(vals) == 0 {
// For response trailers, net/http will pre-populate entries
// with nil values based on the "Trailer" header. But if there
// are no actual values for those keys, we skip them.
continue
}
switch http.CanonicalHeaderKey(key) {
case headerContentType,
headerContentLength,
headerContentEncoding,
headerHost,
headerUserAgent,
headerTrailer,
headerDate:
// HTTP headers.
case connectUnaryHeaderAcceptCompression,
connectUnaryTrailerPrefix,
connectStreamingHeaderCompression,
connectStreamingHeaderAcceptCompression,
connectHeaderTimeout,
connectHeaderProtocolVersion:
// Connect headers.
case grpcHeaderCompression,
grpcHeaderAcceptCompression,
grpcHeaderTimeout,
grpcHeaderStatus,
grpcHeaderMessage,
grpcHeaderDetails:
// gRPC headers.
default:
into[key] = append(into[key], vals...)
}
}
}
// getHeaderCanonical is a shortcut for Header.Get() which
// bypasses the CanonicalMIMEHeaderKey operation when we
// know the key is already in canonical form.
func getHeaderCanonical(h http.Header, key string) string {
if h == nil {
return ""
}
v := h[key]
if len(v) == 0 {
return ""
}
return v[0]
}
// setHeaderCanonical is a shortcut for Header.Set() which
// bypasses the CanonicalMIMEHeaderKey operation when we
// know the key is already in canonical form.
func setHeaderCanonical(h http.Header, key, value string) {
h[key] = []string{value}
}
// delHeaderCanonical is a shortcut for Header.Del() which
// bypasses the CanonicalMIMEHeaderKey operation when we
// know the key is already in canonical form.
func delHeaderCanonical(h http.Header, key string) {
delete(h, key)
}