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108 lines
3.4 KiB
Markdown
108 lines
3.4 KiB
Markdown
# XMPP Stanza
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XMPP `stanza` package is use to parse, marshall and and unmarshal XMPP stanzas and nonzas.
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## Stanza creation
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When creating stanzas, you can use two approaches:
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1. You can create IQ, Presence or Message structs, set the fields and manually prepare extensions struct to add to the
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stanza.
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2. You can use `stanza` build helper to be guided when creating the stanza, and have more controls performed on the
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final stanza.
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The methods are equivalent and you can use whatever suits you best. The helpers will finally generate the same type of
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struct that you can build by hand.
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### Composing stanzas manually with structs
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Here is for example how you would generate an IQ discovery result:
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iqResp := stanza.NewIQ(stanza.Attrs{Type: "result", From: iq.To, To: iq.From, Id: iq.Id, Lang: "en"})
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identity := stanza.Identity{
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Name: opts.Name,
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Category: opts.Category,
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Type: opts.Type,
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}
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payload := stanza.DiscoInfo{
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XMLName: xml.Name{
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Space: stanza.NSDiscoInfo,
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Local: "query",
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},
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Identity: []stanza.Identity{identity},
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Features: []stanza.Feature{
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{Var: stanza.NSDiscoInfo},
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{Var: stanza.NSDiscoItems},
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{Var: "jabber:iq:version"},
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{Var: "urn:xmpp:delegation:1"},
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},
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}
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iqResp.Payload = &payload
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### Using helpers
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Here is for example how you would generate an IQ discovery result using Builder:
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iq := stanza.NewIQ(stanza.Attrs{Type: "get", To: "service.localhost", Id: "disco-get-1"})
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disco := iq.DiscoInfo()
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disco.AddIdentity("Test Component", "gateway", "service")
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disco.AddFeatures(stanza.NSDiscoInfo, stanza.NSDiscoItems, "jabber:iq:version", "urn:xmpp:delegation:1")
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## Payload and extensions
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### Message
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### Presence
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### IQ
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IQ (Information Queries) contain a payload associated with the request and possibly an error. The main difference with
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Message and Presence extension is that you can only have one payload per IQ. The XMPP specification does not support
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having multiple payloads.
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Here is the list of structs implementing IQPayloads:
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- BindBind
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- Pubsub
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Finally, when the payload of the parsed stanza is unknown, the parser will provide the unknown payload as a generic
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`Node` element. You can also use the Node struct to add custom information on stanza generation. However, in both cases,
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you may also consider [adding your own custom extensions on stanzas]().
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## Adding your own custom extensions on stanzas
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Extensions are registered on launch using the `Registry`. It can be used to register you own custom payload. You may
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want to do so to support extensions we did not yet implement, or to add your own custom extensions to your XMPP stanzas.
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To create an extension you need:
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1. to create a struct for that extension. It need to have XMLName for consistency and to tagged at the struct level with
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`xml` info.
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2. It need to implement one or several extensions interface: stanza.IQPayload, stanza.MsgExtension and / or
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stanza.PresExtension
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3. Add that custom extension to the stanza.TypeRegistry during the file init.
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Here an example code showing how to create a custom IQPayload.
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```go
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package myclient
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import (
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"encoding/xml"
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"gosrc.io/xmpp/stanza"
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)
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type CustomPayload struct {
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XMLName xml.Name `xml:"my:custom:payload query"`
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Node string `xml:"node,attr,omitempty"`
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}
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func (c CustomPayload) Namespace() string {
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return c.XMLName.Space
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}
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func init() {
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stanza.TypeRegistry.MapExtension(stanza.PKTIQ, xml.Name{"my:custom:payload", "query"}, CustomPayload{})
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}
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``` |