1 // Copyright 2010 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package textproto 6 7 // A MIMEHeader represents a MIME-style header mapping 8 // keys to sets of values. 9 type MIMEHeader map[string][]string 10 11 // Add adds the key, value pair to the header. 12 // It appends to any existing values associated with key. 13 func (h MIMEHeader) Add(key, value string) { 14 key = CanonicalMIMEHeaderKey(key) 15 h[key] = append(h[key], value) 16 } 17 18 // Set sets the header entries associated with key to 19 // the single element value. It replaces any existing 20 // values associated with key. 21 func (h MIMEHeader) Set(key, value string) { 22 h[CanonicalMIMEHeaderKey(key)] = []string{value} 23 } 24 25 // Get gets the first value associated with the given key. 26 // It is case insensitive; CanonicalMIMEHeaderKey is used 27 // to canonicalize the provided key. 28 // If there are no values associated with the key, Get returns "". 29 // To use non-canonical keys, access the map directly. 30 func (h MIMEHeader) Get(key string) string { 31 if h == nil { 32 return "" 33 } 34 v := h[CanonicalMIMEHeaderKey(key)] 35 if len(v) == 0 { 36 return "" 37 } 38 return v[0] 39 } 40 41 // Values returns all values associated with the given key. 42 // It is case insensitive; CanonicalMIMEHeaderKey is 43 // used to canonicalize the provided key. To use non-canonical 44 // keys, access the map directly. 45 // The returned slice is not a copy. 46 func (h MIMEHeader) Values(key string) []string { 47 if h == nil { 48 return nil 49 } 50 return h[CanonicalMIMEHeaderKey(key)] 51 } 52 53 // Del deletes the values associated with key. 54 func (h MIMEHeader) Del(key string) { 55 delete(h, CanonicalMIMEHeaderKey(key)) 56 } 57