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package xmpp // import "gosrc.io/xmpp"
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import (
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"encoding/xml"
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"fmt"
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"reflect"
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)
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// ============================================================================
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// Message Packet
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type Message struct {
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XMLName xml.Name `xml:"message"`
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PacketAttrs
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Subject string `xml:"subject,omitempty"`
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Body string `xml:"body,omitempty"`
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Thread string `xml:"thread,omitempty"`
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Error Err `xml:"error,omitempty"`
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Extensions []MsgExtension `xml:",omitempty"`
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}
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func (Message) Name() string {
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return "message"
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}
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func NewMessage(msgtype, from, to, id, lang string) Message {
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return Message{
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XMLName: xml.Name{Local: "message"},
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PacketAttrs: PacketAttrs{
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Id: id,
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From: from,
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To: to,
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Type: msgtype,
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Lang: lang,
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},
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}
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}
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type messageDecoder struct{}
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var message messageDecoder
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func (messageDecoder) decode(p *xml.Decoder, se xml.StartElement) (Message, error) {
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var packet Message
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err := p.DecodeElement(&packet, &se)
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return packet, err
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}
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// TODO: Support missing element (thread, extensions) by using proper marshaller
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func (msg *Message) XMPPFormat() string {
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return fmt.Sprintf("<message to='%s' type='chat' xml:lang='en'>"+
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"<body>%s</body></message>",
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msg.To,
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xmlEscape(msg.Body))
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}
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// UnmarshalXML implements custom parsing for IQs
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func (msg *Message) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
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msg.XMLName = start.Name
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// Extract packet attributes
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for _, attr := range start.Attr {
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if attr.Name.Local == "id" {
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msg.Id = attr.Value
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}
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if attr.Name.Local == "type" {
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msg.Type = attr.Value
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}
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if attr.Name.Local == "to" {
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msg.To = attr.Value
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}
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if attr.Name.Local == "from" {
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msg.From = attr.Value
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}
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if attr.Name.Local == "lang" {
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msg.Lang = attr.Value
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}
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}
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// decode inner elements
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for {
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t, err := d.Token()
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if err != nil {
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return err
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}
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switch tt := t.(type) {
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case xml.StartElement:
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var elt interface{}
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elementType := tt.Name.Space
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if extensionType := msgTypeRegistry[elementType]; extensionType != nil {
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val := reflect.New(extensionType)
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elt = val.Interface()
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if msgExt, ok := elt.(MsgExtension); ok {
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err = d.DecodeElement(elt, &tt)
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if err != nil {
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return err
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}
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msg.Extensions = append(msg.Extensions, msgExt)
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}
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} else {
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// Decode default message elements
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var err error
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switch tt.Name.Local {
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case "body":
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err = d.DecodeElement(&msg.Body, &tt)
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case "thread":
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err = d.DecodeElement(&msg.Thread, &tt)
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case "subject":
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err = d.DecodeElement(&msg.Subject, &tt)
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case "error":
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err = d.DecodeElement(&msg.Error, &tt)
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}
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if err != nil {
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return err
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}
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}
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case xml.EndElement:
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if tt == start.End() {
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return nil
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}
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}
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}
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}
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// ============================================================================
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// Message extensions
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// Provide ability to add support to XMPP extension tags on messages
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type MsgExtension interface {
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IsMsgExtension()
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}
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// XEP-0184
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type Receipt struct {
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// xmlns: urn:xmpp:receipts
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XMLName xml.Name
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Id string
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}
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func (*Receipt) IsMsgExtension() {}
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// ============================================================================
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// TODO: Make it configurable at to be able to easily add new XMPP extensions
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// in separate modules
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var msgTypeRegistry = make(map[string]reflect.Type)
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func init() {
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msgTypeRegistry["urn:xmpp:receipts"] = reflect.TypeOf(Receipt{})
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}
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