refactor: improve createMessage and sendMessage interface. (#734)

* add .gitignore content.

* refactor: improve createMessage and sendMessage interface.

* fix interface args.

* fix nil pointer error.

* fix test error.

.gitignore

@@ -4,6 +4,7 @@ components
 logs
 out-test
 *.db
+open-im-sdk-core.*
 
 ### Backup ###
 *.bak

internal/conversation_msg/api.go

@@ -278,6 +278,14 @@ func (c *Conversation) GetConversationIDBySessionType(_ context.Context, sourceI
 }
 
 func (c *Conversation) SendMessage(ctx context.Context, s *sdk_struct.MsgStruct, recvID, groupID string, p *sdkws.OfflinePushInfo, isOnlineOnly bool) (*sdk_struct.MsgStruct, error) {
+	// Message is created by URL
+	if (s.FileElem != nil && s.FileElem.SourceURL != "") ||
+		(s.SoundElem != nil && s.SoundElem.SourceURL != "") ||
+		(s.VideoElem != nil && s.VideoElem.VideoURL != "") ||
+		(s.PictureElem != nil && (s.PictureElem.SourcePicture.Url != "" || s.PictureElem.BigPicture.Url != "" || s.PictureElem.SnapshotPicture.Url != "")) {
+		return c.sendMessageNotOss(ctx, s, recvID, groupID, p, isOnlineOnly)
+	}
+
 	filepathExt := func(name ...string) string {
 		for _, path := range name {
 			if ext := filepath.Ext(path); ext != "" {
@@ -531,7 +539,7 @@ func (c *Conversation) SendMessage(ctx context.Context, s *sdk_struct.MsgStruct,
 	return c.sendMessageToServer(ctx, s, lc, callback, delFile, p, options, isOnlineOnly)
 }
 
-func (c *Conversation) SendMessageNotOss(ctx context.Context, s *sdk_struct.MsgStruct, recvID, groupID string,
+func (c *Conversation) sendMessageNotOss(ctx context.Context, s *sdk_struct.MsgStruct, recvID, groupID string,
 	p *sdkws.OfflinePushInfo, isOnlineOnly bool) (*sdk_struct.MsgStruct, error) {
 	options := make(map[string]bool, 2)
 	lc, err := c.checkID(ctx, s, recvID, groupID, options)