Fix download methods

chat.go

@@ -583,26 +583,52 @@ func (k *Keybase) UploadToConversation(conv chat1.ConvIDStr, title string, filen
 	return k.SendMessage("attach", opts)
 }
 
+// Download downloads a file
+func (k *Keybase) Download(options DownloadOptions) error {
+	type res struct {
+		Error *Error `json:"error"`
+	}
+	var r res
+
+	arg := newDownloadArg(options)
+
+	jsonBytes, _ := json.Marshal(arg)
+
+	cmdOut, err := k.Exec("chat", "api", "-m", string(jsonBytes))
+	if err != nil {
+		return err
+	}
+
+	err = json.Unmarshal(cmdOut, &r)
+	if err != nil {
+		return err
+	}
+
+	if r.Error != nil {
+		return fmt.Errorf("%v", r.Error.Message)
+	}
+
+	return nil
+}
+
 // DownloadFromChannel downloads a file from a channel
-func (k *Keybase) DownloadFromChannel(channel chat1.ChatChannel, msgID chat1.MessageID, filename string) (chat1.SendRes, error) {
+func (k *Keybase) DownloadFromChannel(channel chat1.ChatChannel, msgID chat1.MessageID, output string) error {
-	opts := SendMessageOptions{
+	opts := DownloadOptions{
 		Channel:   channel,
 		MessageID: msgID,
-		Filename:  filename,
+		Output:    output,
 	}
-
+	return k.Download(opts)
-	return k.SendMessage("download", opts)
 }
 
 // DownloadFromConversation downloads a file from a conversation
-func (k *Keybase) DownloadFromConversation(conv chat1.ConvIDStr, msgID chat1.MessageID, filename string) (chat1.SendRes, error) {
+func (k *Keybase) DownloadFromConversation(conv chat1.ConvIDStr, msgID chat1.MessageID, output string) error {
-	opts := SendMessageOptions{
+	opts := DownloadOptions{
 		ConversationID: conv,
 		MessageID:      msgID,
-		Filename:       filename,
+		Output:         output,
 	}
-
+	return k.Download(opts)
-	return k.SendMessage("download", opts)
 }
 
 // LoadFlip returns the results of a flip

types.go

@@ -149,6 +149,34 @@ func newAdvertiseCommandsArg(options AdvertiseCommandsOptions) advertiseCommands
 	}
 }
 
+// DownloadOptions holds a set of options to be passed to Download
+type DownloadOptions struct {
+	Channel        chat1.ChatChannel
+	ConversationID chat1.ConvIDStr `json:"conversation_id"`
+	MessageID      chat1.MessageID `json:"message_id"`
+	Output         string
+	Preview        bool
+	NoStream       bool
+}
+
+type downloadParams struct {
+	Options DownloadOptions
+}
+
+type downloadArg struct {
+	Method string
+	Params downloadParams
+}
+
+func newDownloadArg(options DownloadOptions) downloadArg {
+	return downloadArg{
+		Method: "download",
+		Params: downloadParams{
+			Options: options,
+		},
+	}
+}
+
 // KVOptions holds a set of options to be passed to the KV methods
 type KVOptions struct {
 	Team       *string `json:"team"`