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// Copyright 2021 Northern.tech AS
//
// 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 httpheader
import (
"context"
"net/http"
"net/textproto"
)
type headerKeyType string
func makeKeyName(hdr string) headerKeyType {
key := textproto.CanonicalMIMEHeaderKey(hdr)
return headerKeyType(key)
}
// WithContext stores HTTP headers from `hdrs` which listed in `which` in a
// context and returns the new context (ctx becomes the parent of newly created
// context). Headers care provided as http.Header. Headers that are unset in
// `hdrs` are skipped. Empty header names are skipped as well. Headers are
// stored using httpheader package specific key namespace.
func WithContext(ctx context.Context, hdrs http.Header, which ...string) context.Context {
if hdrs == nil || len(hdrs) == 0 {
return ctx
}
if len(which) == 0 {
return ctx
}
for _, h := range which {
if h == "" {
continue
}
hv := hdrs.Get(h)
if hv == "" {
continue
}
ctx = context.WithValue(ctx, makeKeyName(h), hdrs.Get(h))
}
return ctx
}
// FromContext extracts httpheader header and returns a string. If header was
// not set in the context, an empty string is returned.
func FromContext(ctx context.Context, hdr string) string {
v, ok := ctx.Value(makeKeyName(hdr)).(string)
if !ok {
return ""
}
return v
}
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