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191 lines
3.8 KiB
191 lines
3.8 KiB
// SIP Address Library
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//
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// For example:
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//
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// "J.A. Roberts Tunney" <sip:jtunney@bsdtelecom.net;isup-oli=29>;tag=deadbeef
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//
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// Roughly equates to:
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//
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// {Display: "J.A. Roberts Tunney",
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// Params: {"tag": "deadbeef"},
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// Uri: {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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"log"
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"strings"
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)
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// Represents a SIP Address Linked List
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type Addr struct {
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Uri *URI // never nil
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Display string // blank if not specified
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Params Params // these look like ;key=lol;rport;key=wut
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Next *Addr // for comma separated lists of addresses
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}
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// Parses a SIP address.
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func ParseAddr(s string) (addr *Addr, err error) {
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addr = new(Addr)
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l := len(s)
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if l == 0 {
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return nil, errors.New("empty addr")
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}
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// Extract display.
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switch n := strings.IndexAny(s, "\"<"); {
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case n < 0:
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return nil, errors.New("invalid address")
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case s[n] == '<': // Display is not quoted.
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addr.Display, s = strings.Trim(s[0:n], " "), s[n+1:]
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case s[n] == '"': // We found an opening quote.
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s = s[n+1:]
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LOL:
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for s != "" {
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switch s[0] {
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case '"': // Closing quote.
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s = s[1:]
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break LOL
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case '\\': // Escape sequence.
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if len(s) < 2 {
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return nil, errors.New("evil quote escape")
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}
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switch s[1] {
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case '"':
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addr.Display += "\""
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case '\\':
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addr.Display += "\\"
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}
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s = s[2:]
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default: // Generic character.
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addr.Display += string(s[0])
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s = s[1:]
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}
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}
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if s == "" {
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return nil, errors.New("no closing quote in display")
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}
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for s != "" {
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c := s[0]
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s = s[1:]
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if c == '<' {
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break
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}
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}
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}
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if n := strings.Index(s, ">"); n > 0 {
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addr.Uri, err = ParseURI(s[0:n])
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if err != nil {
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return nil, err
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}
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s = s[n+1:]
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} else {
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addr.Uri, err = ParseURI(s)
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if err != nil {
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return nil, err
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}
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s = ""
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}
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// Extract semicolon delimited params.
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if s != "" && s[0] == ';' {
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addr.Params = parseParams(s[1:])
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s = ""
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}
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// Is there another address?
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s = strings.TrimLeft(s, " \t")
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if s != "" && s[0] == ',' {
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s = strings.TrimLeft(s[1:], " \t")
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if s != "" {
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addr.Next, err = ParseAddr(s)
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if err != nil {
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log.Println("[NOTICE]", "dropping invalid bonus addr:", s, err)
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}
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}
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}
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return addr, nil
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}
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func (addr *Addr) String() string {
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if addr == nil {
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return "<nil>"
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}
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var b bytes.Buffer
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addr.Append(&b)
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return b.String()
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}
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// Returns self if non-nil, otherwise other.
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func (addr *Addr) Or(other *Addr) *Addr {
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if addr == nil {
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return other
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}
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return addr
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}
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// Sets newly generated tag ID and returns self.
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func (addr *Addr) Tag() *Addr {
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addr = addr.Copy()
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addr.Params["tag"] = util.GenerateTag()
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return addr
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}
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// Reassembles a SIP address into a buffer.
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func (addr *Addr) Append(b *bytes.Buffer) {
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if addr.Display != "" {
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b.WriteString("\"")
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b.WriteString(util.EscapeDisplay(addr.Display))
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b.WriteString("\" ")
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}
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b.WriteString("<")
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addr.Uri.Append(b)
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b.WriteString(">")
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addr.Params.Append(b)
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if addr.Next != nil {
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b.WriteString(", ")
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addr.Next.Append(b)
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}
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}
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// Deep copies a new Addr object.
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func (addr *Addr) Copy() *Addr {
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if addr == nil {
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return nil
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}
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res := new(Addr)
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res.Uri = addr.Uri.Copy()
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res.Params = addr.Params.Copy()
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res.Next = addr.Next.Copy()
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return res
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}
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// Returns true if the 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 (addr *Addr) Compare(other *Addr) bool {
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if addr != nil && other != nil {
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return addr.Uri.Compare(other.Uri)
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}
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return false
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}
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// Returns pointer to last addr in linked list.
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func (addr *Addr) Last() *Addr {
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if addr != nil {
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for ; addr.Next != nil; addr = addr.Next {
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}
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}
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return addr
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}
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