[bugfix] Fix `error extracting status content: no content found` (#598)

* don't return error if no content found in Activity

* add test for content extraction

* go fmt

4 files changed, 59 insertions, 11 deletions

diff --git a/internal/ap/extract.go b/internal/ap/extract.go
index 6f08aeef6..7d980f486 100644
--- a/internal/ap/extract.go
+++ b/internal/ap/extract.go
@@ -335,18 +335,24 @@ func ExtractPublicKeyForOwner(i WithPublicKey, forOwner *url.URL) (*rsa.PublicKe
 	return nil, nil, errors.New("couldn't find public key")
 }
 
-// ExtractContent returns a string representation of the interface's Content property.
-func ExtractContent(i WithContent) (string, error) {
+// ExtractContent returns a string representation of the interface's Content property,
+// or an empty string if no Content is found.
+func ExtractContent(i WithContent) string {
 	contentProperty := i.GetActivityStreamsContent()
 	if contentProperty == nil {
-		return "", nil
+		return ""
 	}
+
 	for iter := contentProperty.Begin(); iter != contentProperty.End(); iter = iter.Next() {
-		if iter.IsXMLSchemaString() && iter.GetXMLSchemaString() != "" {
-			return iter.GetXMLSchemaString(), nil
+		if iter.IsXMLSchemaString() {
+			return iter.GetXMLSchemaString()
+		}
+		if iter.IsIRI() && iter.GetIRI() != nil {
+			return iter.GetIRI().String()
 		}
 	}
-	return "", errors.New("no content found")
+
+	return ""
 }
 
 // ExtractAttachments returns a slice of attachments on the interface.
diff --git a/internal/ap/extract_test.go b/internal/ap/extract_test.go
index 0d4e57337..b76717068 100644
--- a/internal/ap/extract_test.go
+++ b/internal/ap/extract_test.go
@@ -92,6 +92,10 @@ func noteWithMentions1() vocab.ActivityStreamsNote {
 
 	note.SetActivityStreamsTag(tags)
 
+	content := streams.NewActivityStreamsContentProperty()
+	content.AppendXMLSchemaString("hey @f0x and @dumpsterqueer")
+	note.SetActivityStreamsContent(content)
+
 	return note
 }
 
diff --git a/internal/ap/extractcontent_test.go b/internal/ap/extractcontent_test.go
new file mode 100644
index 000000000..9f2b1c706
--- /dev/null
+++ b/internal/ap/extractcontent_test.go
@@ -0,0 +1,42 @@
+/*
+   GoToSocial
+   Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package ap_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/superseriousbusiness/gotosocial/internal/ap"
+)
+
+type ExtractContentTestSuite struct {
+	ExtractTestSuite
+}
+
+func (suite *ExtractContentTestSuite) TestExtractContent1() {
+	note := suite.noteWithMentions1
+
+	content := ap.ExtractContent(note)
+
+	suite.Equal("hey @f0x and @dumpsterqueer", content)
+}
+
+func TestExtractContentTestSuite(t *testing.T) {
+	suite.Run(t, &ExtractContentTestSuite{})
+}
diff --git a/internal/typeutils/astointernal.go b/internal/typeutils/astointernal.go
index e8b585f5f..d0c0e51fa 100644
--- a/internal/typeutils/astointernal.go
+++ b/internal/typeutils/astointernal.go
@@ -192,11 +192,7 @@ func (c *converter) ASStatusToStatus(ctx context.Context, statusable ap.Statusab
 	}
 
 	// the html-formatted content of this status
-	if content, err := ap.ExtractContent(statusable); err != nil {
-		l.Infof("ASStatusToStatus: error extracting status content: %s", err)
-	} else {
-		status.Content = content
-	}
+	status.Content = ap.ExtractContent(statusable)
 
 	// attachments to dereference and fetch later on (we don't do that here)
 	if attachments, err := ap.ExtractAttachments(statusable); err != nil {