Update matterbridge/go-xmpp to add xmpp avatar support (#1070)

5 files changed, 178 insertions, 9 deletions

diff --git a/go.mod b/go.mod
index 3da58716..184514b3 100644
--- a/go.mod
+++ b/go.mod
@@ -24,7 +24,7 @@ require (
 	github.com/matterbridge/Rocket.Chat.Go.SDK v0.0.0-20190210153444-cc9d05784d5d
 	github.com/matterbridge/discordgo v0.18.1-0.20200308151012-aa40f01cbcc3
 	github.com/matterbridge/emoji v2.1.1-0.20191117213217-af507f6b02db+incompatible
-	github.com/matterbridge/go-xmpp v0.0.0-20200328215643-8d36ff2c85d1
+	github.com/matterbridge/go-xmpp v0.0.0-20200329150250-5812999b292b
 	github.com/matterbridge/gomatrix v0.0.0-20200209224845-c2104d7936a6
 	github.com/matterbridge/gozulipbot v0.0.0-20190212232658-7aa251978a18
 	github.com/matterbridge/logrus-prefixed-formatter v0.0.0-20180806162718-01618749af61
diff --git a/go.sum b/go.sum
index e3e07622..3d16f1fc 100644
--- a/go.sum
+++ b/go.sum
@@ -130,8 +130,8 @@ github.com/matterbridge/discordgo v0.18.1-0.20200308151012-aa40f01cbcc3 h1:VP/DN
 github.com/matterbridge/discordgo v0.18.1-0.20200308151012-aa40f01cbcc3/go.mod h1:5a1bHtG/38ofcx9cgwM5eTW/Pl4SpbQksNDnTRcGA2Y=
 github.com/matterbridge/emoji v2.1.1-0.20191117213217-af507f6b02db+incompatible h1:oaOqwbg5HxHRxvAbd84ks0Okwoc1ISyUZ87EiVJFhGI=
 github.com/matterbridge/emoji v2.1.1-0.20191117213217-af507f6b02db+incompatible/go.mod h1:igE6rUAn3jai2wCdsjFHfhUoekjrFthoEjFObKKwSb4=
-github.com/matterbridge/go-xmpp v0.0.0-20200328215643-8d36ff2c85d1 h1:1GBtdv3HbYTPbGP3y/QpJ7S4ogB5gs/+gGKhj4ri2CM=
-github.com/matterbridge/go-xmpp v0.0.0-20200328215643-8d36ff2c85d1/go.mod h1:ECDRehsR9TYTKCAsRS8/wLeOk6UUqDydw47ln7wG41Q=
+github.com/matterbridge/go-xmpp v0.0.0-20200329150250-5812999b292b h1:ZYI2HCj9zPzI4Si1ouSOi/ImA2xSQLUCJPQsLWr8FE0=
+github.com/matterbridge/go-xmpp v0.0.0-20200329150250-5812999b292b/go.mod h1:ECDRehsR9TYTKCAsRS8/wLeOk6UUqDydw47ln7wG41Q=
 github.com/matterbridge/gomatrix v0.0.0-20200209224845-c2104d7936a6 h1:Kl65VJv38HjYFnnwH+MP6Z8hcJT5UHuSpHVU5vW1HH0=
 github.com/matterbridge/gomatrix v0.0.0-20200209224845-c2104d7936a6/go.mod h1:+jWeaaUtXQbBRdKYWfjW6JDDYiI2XXE+3NnTjW5kg8g=
 github.com/matterbridge/gozulipbot v0.0.0-20190212232658-7aa251978a18 h1:fLhwXtWGtfTgZVxHG1lcKjv+re7dRwyyuYFNu69xdho=
diff --git a/vendor/github.com/matterbridge/go-xmpp/xmpp.go b/vendor/github.com/matterbridge/go-xmpp/xmpp.go
index cc13218e..bb1438e9 100644
--- a/vendor/github.com/matterbridge/go-xmpp/xmpp.go
+++ b/vendor/github.com/matterbridge/go-xmpp/xmpp.go
@@ -644,7 +644,20 @@ func (c *Client) Recv() (stanza interface{}, err error) {
 		case *clientMessage:
 			if v.Event.XMLNS == XMPPNS_PUBSUB_EVENT {
 				// Handle Pubsub notifications
-				return pubsubClientToReturn(v.Event), nil
+				switch v.Event.Items.Node {
+				case XMPPNS_AVATAR_PEP_METADATA:
+					return handleAvatarMetadata(v.Event.Items.Items[0].Body,
+						v.From)
+				// I am not sure whether this can even happen.
+				// XEP-0084 only specifies a subscription to
+				// the metadata node.
+				/*case XMPPNS_AVATAR_PEP_DATA:
+				return handleAvatarData(v.Event.Items.Items[0].Body,
+					v.From,
+					v.Event.Items.Items[0].ID)*/
+				default:
+					return pubsubClientToReturn(v.Event), nil
+				}
 			}
 
 			stamp, _ := time.Parse(
@@ -745,10 +758,41 @@ func (c *Client) Recv() (stanza interface{}, err error) {
 						return PubsubItems{}, err
 					}
 
-					return PubsubItems{
-						p.Node,
-						pubsubItemsToReturn(p.Items),
-					}, nil
+					switch p.Node {
+					case XMPPNS_AVATAR_PEP_DATA:
+						return handleAvatarData(p.Items[0].Body,
+							v.From,
+							p.Items[0].ID)
+					case XMPPNS_AVATAR_PEP_METADATA:
+						return handleAvatarMetadata(p.Items[0].Body,
+							v.From)
+					default:
+						return PubsubItems{
+							p.Node,
+							pubsubItemsToReturn(p.Items),
+						}, nil
+					}
+					// Note: XEP-0084 states that metadata and data
+					// should be fetched with an id of retrieve1.
+					// Since we already have PubSub implemented, we
+					// can just use items1 and items3 to do the same
+					// as an Avatar node is just a PEP (PubSub) node.
+					/*case "retrieve1":
+					var p clientPubsubItems
+					err := xml.Unmarshal([]byte(v.Query.InnerXML), &p)
+					if err != nil {
+						return PubsubItems{}, err
+					}
+
+					switch p.Node {
+					case XMPPNS_AVATAR_PEP_DATA:
+						return handleAvatarData(p.Items[0].Body,
+							v.From,
+							p.Items[0].ID)
+					case XMPPNS_AVATAR_PEP_METADATA:
+						return handleAvatarMetadata(p.Items[0].Body,
+							v
+					}*/
 				}
 			case v.Query.XMLName.Local == "":
 				return IQ{ID: v.ID, From: v.From, To: v.To, Type: v.Type}, nil
diff --git a/vendor/github.com/matterbridge/go-xmpp/xmpp_avatar.go b/vendor/github.com/matterbridge/go-xmpp/xmpp_avatar.go
new file mode 100644
index 00000000..7303dba5
--- /dev/null
+++ b/vendor/github.com/matterbridge/go-xmpp/xmpp_avatar.go
@@ -0,0 +1,125 @@
+package xmpp
+
+import (
+	"crypto/sha1"
+	"encoding/base64"
+	"encoding/hex"
+	"encoding/xml"
+	"errors"
+	"strconv"
+)
+
+const (
+	XMPPNS_AVATAR_PEP_DATA     = "urn:xmpp:avatar:data"
+	XMPPNS_AVATAR_PEP_METADATA = "urn:xmpp:avatar:metadata"
+)
+
+type clientAvatarData struct {
+	XMLName xml.Name `xml:"data"`
+	Data    []byte   `xml:",innerxml"`
+}
+
+type clientAvatarInfo struct {
+	XMLName xml.Name `xml:"info"`
+	Bytes   string   `xml:"bytes,attr"`
+	Width   string   `xml:"width,attr"`
+	Height  string   `xml:"height,attr"`
+	ID      string   `xml:"id,attr"`
+	Type    string   `xml:"type,attr"`
+	URL     string   `xml:"url,attr"`
+}
+
+type clientAvatarMetadata struct {
+	XMLName xml.Name         `xml:"metadata"`
+	XMLNS   string           `xml:"xmlns,attr"`
+	Info    clientAvatarInfo `xml:"info"`
+}
+
+type AvatarData struct {
+	Data []byte
+	From string
+}
+
+type AvatarMetadata struct {
+	From   string
+	Bytes  int
+	Width  int
+	Height int
+	ID     string
+	Type   string
+	URL    string
+}
+
+func handleAvatarData(itemsBody []byte, from, id string) (AvatarData, error) {
+	var data clientAvatarData
+	err := xml.Unmarshal(itemsBody, &data)
+	if err != nil {
+		return AvatarData{}, err
+	}
+
+	// Base64-decode the avatar data to check its SHA1 hash
+	dataRaw, err := base64.StdEncoding.DecodeString(
+		string(data.Data))
+	if err != nil {
+		return AvatarData{}, err
+	}
+
+	hash := sha1.Sum(dataRaw)
+	hashStr := hex.EncodeToString(hash[:])
+	if hashStr != id {
+		return AvatarData{}, errors.New("SHA1 hashes do not match")
+	}
+
+	return AvatarData{
+		Data: dataRaw,
+		From: from,
+	}, nil
+}
+
+func handleAvatarMetadata(body []byte, from string) (AvatarMetadata, error) {
+	var meta clientAvatarMetadata
+	err := xml.Unmarshal(body, &meta)
+	if err != nil {
+		return AvatarMetadata{}, err
+	}
+
+	return AvatarMetadata{
+		From:   from,
+		Bytes:  atoiw(meta.Info.Bytes),
+		Width:  atoiw(meta.Info.Width),
+		Height: atoiw(meta.Info.Height),
+		ID:     meta.Info.ID,
+		Type:   meta.Info.Type,
+		URL:    meta.Info.URL,
+	}, nil
+}
+
+// A wrapper for atoi which just returns -1 if an error occurs
+func atoiw(str string) int {
+	i, err := strconv.Atoi(str)
+	if err != nil {
+		return -1
+	}
+
+	return i
+}
+
+func (c *Client) AvatarSubscribeMetadata(jid string) {
+	c.PubsubSubscribeNode(XMPPNS_AVATAR_PEP_METADATA, jid)
+}
+
+func (c *Client) AvatarUnsubscribeMetadata(jid string) {
+	c.PubsubUnsubscribeNode(XMPPNS_AVATAR_PEP_METADATA, jid)
+}
+
+func (c *Client) AvatarRequestData(jid string) {
+	c.PubsubRequestLastItems(XMPPNS_AVATAR_PEP_DATA, jid)
+}
+
+func (c *Client) AvatarRequestDataByID(jid, id string) {
+	c.PubsubRequestItem(XMPPNS_AVATAR_PEP_DATA, jid, id)
+}
+
+func (c *Client) AvatarRequestMetadata(jid string) {
+	c.PubsubRequestLastItems(XMPPNS_AVATAR_PEP_METADATA, jid)
+}
diff --git a/vendor/modules.txt b/vendor/modules.txt
index b63c1861..54b6eab9 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -103,7 +103,7 @@ github.com/matterbridge/Rocket.Chat.Go.SDK/rest
 github.com/matterbridge/discordgo
 # github.com/matterbridge/emoji v2.1.1-0.20191117213217-af507f6b02db+incompatible
 github.com/matterbridge/emoji
-# github.com/matterbridge/go-xmpp v0.0.0-20200328215643-8d36ff2c85d1
+# github.com/matterbridge/go-xmpp v0.0.0-20200329150250-5812999b292b
 github.com/matterbridge/go-xmpp
 # github.com/matterbridge/gomatrix v0.0.0-20200209224845-c2104d7936a6
 github.com/matterbridge/gomatrix