/
header.go
97 lines (87 loc) · 2.26 KB
/
header.go
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package rtsp
import (
"bufio"
"fmt"
"io"
"strings"
)
// Header is a collection of key/value pairs belonging to
// a request or response.
type Header map[string][]string
// Set sets the header value
func (h Header) Set(name, value string) {
h[name] = []string{value}
}
// Add adds the header value
func (h Header) Add(name, value string) {
h[name] = append(h[name], value)
}
// Get returns the first header value with the provided name.
// If not found, an empty string is returned.
func (h Header) Get(name string) string {
if len(h[name]) == 0 {
return ""
}
return h[name][0]
}
// Param looks up the header by name and returns the corresponding value for
// the provided key. The expected format is key1=value1;key2=value2 ...
func (h Header) Param(name, key string) (string, bool) {
for _, p := range strings.Split(h.Get(name), ";") {
param := strings.SplitN(p, "=", 2)
if len(param) == 2 && strings.TrimSpace(param[0]) == key {
return strings.TrimSpace(param[1]), true
}
}
return "", false
}
// Field looks up the header by name and returns the field for the provided
// index. The expected format is field1;field2;field3 ...
func (h Header) Field(name string, index int) (string, bool) {
fields := strings.Split(h.Get(name), ";")
if index < 0 || index >= len(fields) {
return "", false
}
return strings.TrimSpace(fields[index]), true
}
// Write the header key/values to the provided writer
func (h Header) Write(w io.Writer) error {
for key, values := range h {
for _, value := range values {
line := key + ": " + value + "\r\n"
if _, err := w.Write([]byte(line)); err != nil {
return err
}
}
}
return nil
}
// ReadHeader reads headers from the provided reader
func ReadHeader(r *bufio.Reader) (Header, error) {
h := Header{}
for {
line, err := readLine(r)
if err != nil {
return nil, err
}
if len(line) == 0 {
return h, nil
}
index := strings.IndexByte(line, ':')
if index == -1 {
return nil, fmt.Errorf("invalid header: %q", line)
}
key := strings.TrimSpace(line[:index])
h.Add(key, strings.TrimSpace(line[index+1:]))
}
}
// Clone returns a copy of the headers
func (h Header) Clone() Header {
h2 := make(Header, len(h))
for k, v := range h {
v2 := make([]string, len(v))
copy(v2, v)
h2[k] = v2
}
return h2
}