feat: enforce tenant content moderation

server/datamodel.go

@@ -10,11 +10,13 @@ package main
 
 import (
 	"encoding/json"
+	"errors"
 	"net/http"
 	"strconv"
 	"strings"
 	"time"
 
+	"github.com/tinode/chat/server/moderation"
 	"github.com/tinode/chat/server/store/types"
 )
 
@@ -1619,6 +1621,20 @@ func ErrPolicyReply(msg *ClientComMessage, ts time.Time) *ServerComMessage {
 	return ErrPolicyExplicitTs(msg.Id, msg.Original, ts, msg.Timestamp)
 }
 
+func ErrContentModerationReply(msg *ClientComMessage, ts time.Time, err error, result *moderation.Result) *ServerComMessage {
+	reply := ErrPolicyReply(msg, ts)
+	reason := "CONTENT_REJECTED"
+	if errors.Is(err, moderation.ErrUnavailable) {
+		reason = "CONTENT_REVIEW_UNAVAILABLE"
+	}
+	reply.Ctrl.Text = "content rejected"
+	reply.Ctrl.Params = map[string]any{"reason": reason}
+	if result != nil && strings.TrimSpace(result.BlockMessage) != "" {
+		reply.Ctrl.Params.(map[string]any)["message"] = result.BlockMessage
+	}
+	return reply
+}
+
 // ErrCallBusyExplicitTs indicates a "busy" reply to a video call request (486).
 func ErrCallBusyExplicitTs(id, topic string, serverTs, incomingReqTs time.Time) *ServerComMessage {
 	return &ServerComMessage{