125 lines
3.5 KiB
Go
125 lines
3.5 KiB
Go
/*
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* Copyright 2020 The Dragonfly Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package source
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import (
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"net/http"
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"net/textproto"
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)
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const (
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// Range is different with HTTP Range, it's without "bytes=" prefix
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Range = "X-Dragonfly-Range" // startIndex-endIndex
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)
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const (
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LastModifiedLayout = http.TimeFormat
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ExpireLayout = http.TimeFormat
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)
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type ExpireInfo struct {
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Expire string // Mon, 02 Jan 2006 15:04:05 GMT
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LastModified string // Mon, 02 Jan 2006 15:04:05 GMT
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ETag string
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}
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// A Header represents the key-value pairs in a Dragonfly source header.
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//
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// The keys should be in canonical form, as returned by
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// CanonicalHeaderKey.
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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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// The key is case insensitive; it is canonicalized by
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// CanonicalHeaderKey.
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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 the
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// single element value. It replaces any existing values
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// associated with key. The key is case insensitive; it is
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// canonicalized by textproto.CanonicalMIMEHeaderKey.
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// To use non-canonical keys, assign to the map directly.
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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. If
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// there are no values associated with the key, Get returns "".
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// It is case insensitive; textproto.CanonicalMIMEHeaderKey is
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// used to canonicalize the provided key. To use non-canonical keys,
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// access the map directly.
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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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// Values returns all values associated with the given key.
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// It is case insensitive; textproto.CanonicalMIMEHeaderKey is
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// used to canonicalize the provided key. To use non-canonical
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// keys, access the map directly.
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// The returned slice is not a copy.
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func (h Header) Values(key string) []string {
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return textproto.MIMEHeader(h).Values(key)
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}
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// get is like Get, but key must already be in CanonicalHeaderKey form.
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func (h Header) get(key string) string {
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if v := h[key]; len(v) > 0 {
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return v[0]
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}
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return ""
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}
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// has reports whether h has the provided key defined, even if it's
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// set to 0-length slice.
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func (h Header) has(key string) bool {
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_, ok := h[key]
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return ok
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}
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// Del deletes the values associated with key.
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// The key is case insensitive; it is canonicalized by
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// CanonicalHeaderKey.
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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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// Clone returns a copy of h or nil if h is nil.
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func (h Header) Clone() Header {
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if h == nil {
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return nil
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}
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// Find total number of values.
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nv := 0
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for _, vv := range h {
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nv += len(vv)
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}
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sv := make([]string, nv) // shared backing array for headers' values
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h2 := make(Header, len(h))
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for k, vv := range h {
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n := copy(sv, vv)
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h2[k] = sv[:n:n]
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sv = sv[n:]
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}
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return h2
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}
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func CanonicalHeaderKey(s string) string { return textproto.CanonicalMIMEHeaderKey(s) }
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