1 files changed, 115 insertions, 0 deletions
diff --git a/xmpp/gateway/gateway.go b/xmpp/gateway/gateway.go
index 0c22677..11f68c1 100644
--- a/xmpp/gateway/gateway.go
+++ b/xmpp/gateway/gateway.go
@@ -2,12 +2,19 @@ package gateway
 
 import (
 	"encoding/xml"
+	"github.com/pkg/errors"
+
+	"dev.narayana.im/narayana/telegabber/xmpp/extensions"
 
 	log "github.com/sirupsen/logrus"
+	"github.com/soheilhy/args"
 	"gosrc.io/xmpp"
 	"gosrc.io/xmpp/stanza"
 )
 
+// Queue stores presences to send later
+type Queue map[string]*stanza.Presence
+
 // Jid stores the component's JID object
 var Jid *xmpp.Jid
 
@@ -51,3 +58,111 @@ func SendMessage(to string, from string, body string, component *xmpp.Component)
 
 	_ = component.Send(message)
 }
+
+// LogBadPresence verbosely logs a presence
+func LogBadPresence(err error, presence *stanza.Presence) {
+	log.WithFields(log.Fields{
+		"presence": *presence,
+	}).Error(errors.Wrap(err, "Couldn't send presence"))
+}
+
+// SPFrom is a Telegram user id
+var SPFrom = args.NewString()
+
+// SPType is a presence type
+var SPType = args.NewString()
+
+// SPShow is a availability status
+var SPShow = args.NewString()
+
+// SPStatus is a verbose status
+var SPStatus = args.NewString()
+
+// SPNickname is a XEP-0172 nickname
+var SPNickname = args.NewString()
+
+// SPPhoto is a XEP-0153 hash of avatar in vCard
+var SPPhoto = args.NewString()
+
+// SPImmed skips queueing
+var SPImmed = args.NewBool(args.Default(true))
+
+func newPresence(bareJid string, to string, args ...args.V) stanza.Presence {
+	var presenceFrom string
+	if SPFrom.IsSet(args) {
+		presenceFrom = SPFrom.Get(args) + "@" + bareJid
+	} else {
+		presenceFrom = bareJid
+	}
+
+	presence := stanza.Presence{Attrs: stanza.Attrs{
+		From: presenceFrom,
+		To:   to,
+	}}
+
+	if SPType.IsSet(args) {
+		presence.Attrs.Type = stanza.StanzaType(SPType.Get(args))
+	}
+	if SPShow.IsSet(args) {
+		presence.Show = stanza.PresenceShow(SPShow.Get(args))
+	}
+	if SPStatus.IsSet(args) {
+		presence.Status = SPStatus.Get(args)
+	}
+	if SPNickname.IsSet(args) {
+		presence.Extensions = append(presence.Extensions, extensions.PresenceNickExtension{
+			Text: SPNickname.Get(args),
+		})
+	}
+	if SPPhoto.IsSet(args) {
+		presence.Extensions = append(presence.Extensions, extensions.PresenceXVCardUpdateExtension{
+			Photo: extensions.PresenceXVCardUpdatePhoto{
+				Text: SPPhoto.Get(args),
+			},
+		})
+	}
+
+	return presence
+}
+
+// SendPresence creates and sends a presence stanza
+func SendPresence(component *xmpp.Component, queue Queue, to string, args ...args.V) error {
+	var logFrom string
+	bareJid := Jid.Bare()
+	if SPFrom.IsSet(args) {
+		logFrom = SPFrom.Get(args)
+	} else {
+		logFrom = bareJid
+	}
+
+	log.WithFields(log.Fields{
+		"type": SPType.Get(args),
+		"from": logFrom,
+		"to":   to,
+	}).Info("Got presence")
+
+	presence := newPresence(bareJid, to, args...)
+
+	// explicit check, as marshalling is expensive
+	if log.GetLevel() == log.DebugLevel {
+		xmlPresence, err := xml.Marshal(presence)
+		if err == nil {
+			log.Debug(string(xmlPresence))
+		} else {
+			log.Debugf("%#v", presence)
+		}
+	}
+
+	immed := SPImmed.Get(args)
+	if immed {
+		err := component.Send(presence)
+		if err != nil {
+			LogBadPresence(err, &presence)
+			return err
+		}
+	} else {
+		queue[presence.From+presence.To] = &presence
+	}
+
+	return nil
+}