MM-17609 Add EnableSVGs setting (#11874)

* MM-17609 Add EnableSVGs setting

* MM-17609 Return SVG images in post metadata

app/diagnostics.go

@@ -299,6 +299,7 @@ func (a *App) trackConfig() {
 		"experimental_ldap_group_sync":                            *cfg.ServiceSettings.ExperimentalLdapGroupSync,
 		"disable_bots_when_owner_is_deactivated":                  *cfg.ServiceSettings.DisableBotsWhenOwnerIsDeactivated,
 		"enable_bot_account_creation":                             *cfg.ServiceSettings.EnableBotAccountCreation,
+		"enable_svgs":                                             *cfg.ServiceSettings.EnableSVGs,
 	})
 
 	a.SendDiagnostic(TRACK_CONFIG_TEAM, map[string]interface{}{

app/post_metadata.go

@@ -495,7 +495,13 @@ func cacheLinkMetadata(requestURL string, timestamp int64, og *opengraph.OpenGra
 }
 
 func (a *App) parseLinkMetadata(requestURL string, body io.Reader, contentType string) (*opengraph.OpenGraph, *model.PostImage, error) {
-	if strings.HasPrefix(contentType, "image") {
+	if contentType == "image/svg+xml" {
+		image := &model.PostImage{
+			Format: "svg",
+		}
+
+		return nil, image, nil
+	} else if strings.HasPrefix(contentType, "image") {
 		image, err := parseImages(io.LimitReader(body, MaxMetadataImageSize))
 		return nil, image, err
 	} else if strings.HasPrefix(contentType, "text/html") {

app/post_metadata_test.go

@@ -2013,6 +2013,16 @@ func TestParseLinkMetadata(t *testing.T) {
 		assert.Nil(t, og)
 		assert.Nil(t, dimensions)
 	})
+
+	t.Run("svg", func(t *testing.T) {
+		og, dimensions, err := th.App.parseLinkMetadata("http://example.com/image.svg", nil, "image/svg+xml")
+		assert.Nil(t, err)
+
+		assert.Nil(t, og)
+		assert.Equal(t, &model.PostImage{
+			Format: "svg",
+		}, dimensions)
+	})
 }
 
 func TestParseImages(t *testing.T) {