149 lines
3.4 KiB
Go
149 lines
3.4 KiB
Go
package stanza
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import (
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"encoding/xml"
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"reflect"
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)
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// ============================================================================
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// Message Packet
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// Message implements RFC 6120 - A.5 Client Namespace (a part)
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type Message struct {
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XMLName xml.Name `xml:"message"`
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Attrs
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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(a Attrs) Message {
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return Message{
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XMLName: xml.Name{Local: "message"},
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Attrs: a,
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}
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}
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// Get search and extracts a specific extension on a message.
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// It receives a pointer to an MsgExtension. It will panic if the caller
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// does not pass a pointer.
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// It will return true if the passed extension is found and set the pointer
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// to the extension passed as parameter to the found extension.
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// It will return false if the extension is not found on the message.
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//
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// Example usage:
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// var oob xmpp.OOB
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// if ok := msg.Get(&oob); ok {
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// // oob extension has been found
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// }
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func (msg *Message) Get(ext MsgExtension) bool {
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target := reflect.ValueOf(ext)
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if target.Kind() != reflect.Ptr {
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panic("you must pass a pointer to the message Get method")
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}
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for _, e := range msg.Extensions {
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if reflect.TypeOf(e) == target.Type() {
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source := reflect.ValueOf(e)
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if source.Kind() != reflect.Ptr {
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source = source.Elem()
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}
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target.Elem().Set(source.Elem())
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return true
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}
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}
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return false
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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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// XMPPFormat with all Extensions
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func (msg *Message) XMPPFormat() string {
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out, err := xml.MarshalIndent(msg, "", "")
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if err != nil {
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return ""
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}
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return string(out)
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}
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// UnmarshalXML implements custom parsing for messages
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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 = StanzaType(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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if msgExt := TypeRegistry.GetMsgExtension(tt.Name); msgExt != nil {
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// Decode message extension
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err = d.DecodeElement(msgExt, &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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} else {
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// Decode standard message sub-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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