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jeremybenn |
// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package http
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import (
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"fmt"
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"io"
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"net/textproto"
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"sort"
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"strings"
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)
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// A Header represents the key-value pairs in an HTTP header.
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type Header map[string][]string
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// Add adds the key, value pair to the header.
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// It appends to any existing values associated with key.
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func (h Header) Add(key, value string) {
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textproto.MIMEHeader(h).Add(key, value)
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}
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// Set sets the header entries associated with key to
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// the single element value. It replaces any existing
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// values associated with key.
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func (h Header) Set(key, value string) {
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textproto.MIMEHeader(h).Set(key, value)
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}
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// Get gets the first value associated with the given key.
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// If there are no values associated with the key, Get returns "".
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// To access multiple values of a key, access the map directly
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// with CanonicalHeaderKey.
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func (h Header) Get(key string) string {
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return textproto.MIMEHeader(h).Get(key)
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}
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// Del deletes the values associated with key.
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func (h Header) Del(key string) {
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textproto.MIMEHeader(h).Del(key)
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}
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// Write writes a header in wire format.
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func (h Header) Write(w io.Writer) error {
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return h.WriteSubset(w, nil)
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}
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var headerNewlineToSpace = strings.NewReplacer("\n", " ", "\r", " ")
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// WriteSubset writes a header in wire format.
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// If exclude is not nil, keys where exclude[key] == true are not written.
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func (h Header) WriteSubset(w io.Writer, exclude map[string]bool) error {
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keys := make([]string, 0, len(h))
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for k := range h {
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if exclude == nil || !exclude[k] {
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keys = append(keys, k)
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}
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}
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sort.Strings(keys)
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for _, k := range keys {
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for _, v := range h[k] {
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v = headerNewlineToSpace.Replace(v)
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v = strings.TrimSpace(v)
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if _, err := fmt.Fprintf(w, "%s: %s\r\n", k, v); err != nil {
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return err
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}
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}
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}
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return nil
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}
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// CanonicalHeaderKey returns the canonical format of the
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// header key s. The canonicalization converts the first
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// letter and any letter following a hyphen to upper case;
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// the rest are converted to lowercase. For example, the
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// canonical key for "accept-encoding" is "Accept-Encoding".
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func CanonicalHeaderKey(s string) string { return textproto.CanonicalMIMEHeaderKey(s) }
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