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202 lines
4.2 KiB
202 lines
4.2 KiB
// SIP URI Library
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//
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// We can't use net.URL because it doesn't support SIP URIs. This is because:
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// a) it doesn't support semicolon parameters; b) it doesn't extract the user
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// and host information when the "//" isn't present.
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//
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// For example:
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//
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// jtunney@bsdtelecom.net;isup-oli=29
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//
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// Roughly equates to:
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//
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// {Scheme: "sip",
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// User: "jtunney",
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// Pass: "",
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// Host: "bsdtelecom.net",
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// Port: "",
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// Params: {"isup-oli": "29"}}
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//
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package sip
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import (
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"bytes"
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"errors"
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"github.com/jart/gosip/util"
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"strconv"
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"strings"
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)
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const (
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delims = ":/@;?#<>"
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)
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var (
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URIEmpty = errors.New("empty uri")
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URISchemeNotFound = errors.New("scheme not found")
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URIMissingHost = errors.New("host missing")
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URIBadPort = errors.New("invalid port number")
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)
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type Params map[string]string
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type URI struct {
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Scheme string // sip, tel, etc. (never blank)
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User string // sip:USER@host
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Pass string // sip:user:PASS@host
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Host string // example.com, 1.2.3.4, etc.
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Port uint16 // 5060, 80, etc.
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Params Params // semicolon delimited params after uris and addrs
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}
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// Parses a SIP URI.
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func ParseURI(s string) (uri *URI, err error) {
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uri = new(URI)
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if s == "" {
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return nil, URIEmpty
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}
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// Extract scheme.
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n := strings.IndexAny(s, delims)
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if n < 0 || s[n] != ':' {
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return nil, URISchemeNotFound
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}
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uri.Scheme, s = s[0:n], s[n+1:]
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// Extract user/pass.
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n = strings.IndexAny(s, delims)
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if n > 0 && s[n] == ':' { // sip:user:pass@host
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// if next token isn't '@' then assume 'sip:host:port'
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s2 := s[n+1:]
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n2 := strings.IndexAny(s2, delims)
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if n2 > 0 && s2[n2] == '@' {
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uri.User = s[0:n]
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s, n = s2, n2
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if n < 0 || s[n] != '@' {
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return nil, URIMissingHost
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}
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uri.Pass, s = s[0:n], s[n+1:]
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}
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} else if n > 0 && s[n] == '@' { // user@host
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uri.User, s = s[0:n], s[n+1:]
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}
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// Extract host/port.
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s, uri.Host, uri.Port, err = extractHostPort(s)
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if err != nil {
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return nil, err
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}
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// Extract semicolon delimited params.
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if s != "" && s[0] == ';' {
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uri.Params = parseParams(s[1:])
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s = ""
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}
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// if s != "" {
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// fmt.Fprintf(os.Stderr, "leftover data: %v\n", s)
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// }
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uri.User, err = util.URLUnescape(uri.User, false)
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if err != nil {
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return nil, err
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}
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uri.Pass, err = util.URLUnescape(uri.Pass, false)
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if err != nil {
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return nil, err
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}
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uri.Host, err = util.URLUnescape(uri.Host, false)
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if err != nil {
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return nil, err
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}
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return uri, nil
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}
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// Deep copies a URI object.
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func (uri *URI) Copy() *URI {
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if uri == nil {
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return nil
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}
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res := new(URI)
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*res = *uri
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res.Params = uri.Params.Copy()
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return res
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}
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func (uri *URI) String() string {
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if uri == nil {
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return "<nil>"
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}
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var b bytes.Buffer
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uri.Append(&b)
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return b.String()
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}
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func (uri *URI) Append(b *bytes.Buffer) {
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if uri.Scheme == "" {
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uri.Scheme = "sip"
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}
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b.WriteString(uri.Scheme)
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b.WriteString(":")
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if uri.User != "" {
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if uri.Pass != "" {
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b.WriteString(util.URLEscape(uri.User, false))
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b.WriteString(":")
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b.WriteString(util.URLEscape(uri.Pass, false))
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} else {
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b.WriteString(util.URLEscape(uri.User, false))
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}
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b.WriteString("@")
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}
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if util.IsIPv6(uri.Host) {
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b.WriteString("[" + util.URLEscape(uri.Host, false) + "]")
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} else {
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b.WriteString(util.URLEscape(uri.Host, false))
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}
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if uri.Port > 0 && uri.Port != 5060 {
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b.WriteString(":" + strconv.FormatInt(int64(uri.Port), 10))
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}
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uri.Params.Append(b)
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}
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// Returns true if scheme, host, and port match. if a username is present in
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// `addr`, then the username is `other` must also match.
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func (uri *URI) Compare(other *URI) bool {
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if uri != nil && other != nil {
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if uri.Scheme == other.Scheme &&
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uri.Host == other.Host &&
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uri.Port == other.Port {
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if uri.User != "" {
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if uri.User == other.User {
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return true
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}
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} else {
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return true
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}
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}
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}
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return false
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}
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func (params Params) Copy() Params {
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res := make(Params, len(params))
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for k, v := range params {
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res[k] = v
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}
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return res
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}
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func (params Params) Append(b *bytes.Buffer) {
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if params != nil && len(params) > 0 {
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for k, v := range params {
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b.WriteString(";")
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b.WriteString(util.URLEscape(k, false))
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if v != "" {
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b.WriteString("=")
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b.WriteString(util.URLEscape(v, false))
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}
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}
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}
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}
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