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// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package http
import (
"fmt"
"io"
"net/textproto"
"sort"
"strings"
)
// A Header represents the key-value pairs in an HTTP header.
type Header map[string][]string
// Add adds the key, value pair to the header.
// It appends to any existing values associated with key.
func (h Header) Add(key, value string) {
textproto.MIMEHeader(h).Add(key, value)
}
// Set sets the header entries associated with key to
// the single element value. It replaces any existing
// values associated with key.
func (h Header) Set(key, value string) {
textproto.MIMEHeader(h).Set(key, value)
}
// Get gets the first value associated with the given key.
// If there are no values associated with the key, Get returns "".
// To access multiple values of a key, access the map directly
// with CanonicalHeaderKey.
func (h Header) Get(key string) string {
return textproto.MIMEHeader(h).Get(key)
}
// Del deletes the values associated with key.
func (h Header) Del(key string) {
textproto.MIMEHeader(h).Del(key)
}
// Write writes a header in wire format.
func (h Header) Write(w io.Writer) error {
return h.WriteSubset(w, nil)
}
var headerNewlineToSpace = strings.NewReplacer("\n", " ", "\r", " ")
// WriteSubset writes a header in wire format.
// If exclude is not nil, keys where exclude[key] == true are not written.
func (h Header) WriteSubset(w io.Writer, exclude map[string]bool) error {
keys := make([]string, 0, len(h))
for k := range h {
if exclude == nil || !exclude[k] {
keys = append(keys, k)
}
}
sort.Strings(keys)
for _, k := range keys {
for _, v := range h[k] {
v = headerNewlineToSpace.Replace(v)
v = strings.TrimSpace(v)
if _, err := fmt.Fprintf(w, "%s: %s\r\n", k, v); err != nil {
return err
}
}
}
return nil
}
// CanonicalHeaderKey returns the canonical format of the
// header key s. The canonicalization converts the first
// letter and any letter following a hyphen to upper case;
// the rest are converted to lowercase. For example, the
// canonical key for "accept-encoding" is "Accept-Encoding".
func CanonicalHeaderKey(s string) string { return textproto.CanonicalMIMEHeaderKey(s) }
// hasToken returns whether token appears with v, ASCII
// case-insensitive, with space or comma boundaries.
// token must be all lowercase.
// v may contain mixed cased.
func hasToken(v, token string) bool {
if len(token) > len(v) || token == "" {
return false
}
if v == token {
return true
}
for sp := 0; sp <= len(v)-len(token); sp++ {
// Check that first character is good.
// The token is ASCII, so checking only a single byte
// is sufficient. We skip this potential starting
// position if both the first byte and its potential
// ASCII uppercase equivalent (b|0x20) don't match.
// False positives ('^' => '~') are caught by EqualFold.
if b := v[sp]; b != token[0] && b|0x20 != token[0] {
continue
}
// Check that start pos is on a valid token boundary.
if sp > 0 && !isTokenBoundary(v[sp-1]) {
continue
}
// Check that end pos is on a valid token boundary.
if endPos := sp + len(token); endPos != len(v) && !isTokenBoundary(v[endPos]) {
continue
}
if strings.EqualFold(v[sp:sp+len(token)], token) {
return true
}
}
return false
}
func isTokenBoundary(b byte) bool {
return b == ' ' || b == ',' || b == '\t'
}
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