diff --git a/core/group_chat.go b/core/group_chat.go
index 26ab557..5b08c57 100644
--- a/core/group_chat.go
+++ b/core/group_chat.go
@@ -2,6 +2,7 @@ package core
 
 import (
 	"encoding/json"
+	"io"
 	"net/http"
 	"reflect"
 
@@ -97,6 +98,7 @@ func (gc *groupChat) Initialize(sub *subTavern, cfg configDocument) error {
 
 	sub.apiFuncs.registApiFunction("CreateChattingChannel", gc.CreateChattingChannel)
 	sub.apiFuncs.registApiFunction("FetchChattingChannels", gc.FetchChattingChannels)
+	sub.apiFuncs.registApiFunction("BroadcastMessageOnChannel", gc.BroadcastMessageOnChannel)
 
 	for name, cfg := range gc.chatConfig.Channels {
 		if _, ok := cfg["capacity"]; !ok {
@@ -224,3 +226,15 @@ func (gc *groupChat) FetchChattingChannels(w http.ResponseWriter, r *http.Reques
 	enc := json.NewEncoder(w)
 	enc.Encode(channels)
 }
+
+func (gc *groupChat) BroadcastMessageOnChannel(w http.ResponseWriter, r *http.Request) {
+	nickname, _ := gocommon.ReadStringFormValue(r.Form, "nickname")
+	channel, _ := gocommon.ReadStringFormValue(r.Form, "channel")
+	text, _ := io.ReadAll(r.Body)
+
+	gc.sendUpstreamMessage(&wshandler.UpstreamMessage{
+		Target: "#" + channel,
+		Body:   map[string]any{"sender": nickname, "msg": string(text)},
+		Tag:    []string{"TextMessage"},
+	})
+}
diff --git a/go.mod b/go.mod
index 98bf38b..5c381e0 100644
--- a/go.mod
+++ b/go.mod
@@ -5,7 +5,7 @@ go 1.20
 require (
 	github.com/go-redis/redis/v8 v8.11.5
 	go.mongodb.org/mongo-driver v1.11.7
-	repositories.action2quare.com/ayo/gocommon v0.0.0-20230801051747-b501160efc3b
+	repositories.action2quare.com/ayo/gocommon v0.0.0-20230802072134-f6441a9b4c53
 )
 
 require (
diff --git a/go.sum b/go.sum
index e1e51f1..2c36f45 100644
--- a/go.sum
+++ b/go.sum
@@ -106,3 +106,5 @@ gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 repositories.action2quare.com/ayo/gocommon v0.0.0-20230801051747-b501160efc3b h1:yV1cBeu0GFxkDD6TDxzKv/rM3OMtyt1JXpeqDF5IO3Y=
 repositories.action2quare.com/ayo/gocommon v0.0.0-20230801051747-b501160efc3b/go.mod h1:PdpZ16O1czKKxCxn+0AFNaEX/0kssYwC3G8jR0V7ybw=
+repositories.action2quare.com/ayo/gocommon v0.0.0-20230802072134-f6441a9b4c53 h1:E3wNjCk4ztgrkSiU6NUvn0Ss7CN0bpkAKKINfpIniS4=
+repositories.action2quare.com/ayo/gocommon v0.0.0-20230802072134-f6441a9b4c53/go.mod h1:PdpZ16O1czKKxCxn+0AFNaEX/0kssYwC3G8jR0V7ybw=