feat: add system prompt override functionality in channel settings and request handling #1468

relay/relay-text.go

@@ -201,6 +201,26 @@ func TextHelper(c *gin.Context) (newAPIError *types.NewAPIError) {
 					Content: relayInfo.ChannelSetting.SystemPrompt,
 				}
 				request.Messages = append([]dto.Message{systemMessage}, request.Messages...)
+			} else if relayInfo.ChannelSetting.SystemPromptOverride {
+				common.SetContextKey(c, constant.ContextKeySystemPromptOverride, true)
+				// 如果有系统提示，且允许覆盖，则拼接到前面
+				for i, message := range request.Messages {
+					if message.Role == request.GetSystemRoleName() {
+						if message.IsStringContent() {
+							request.Messages[i].SetStringContent(relayInfo.ChannelSetting.SystemPrompt + "\n" + message.StringContent())
+						} else {
+							contents := message.ParseContent()
+							contents = append([]dto.MediaContent{
+								{
+									Type: dto.ContentTypeText,
+									Text: relayInfo.ChannelSetting.SystemPrompt,
+								},
+							}, contents...)
+							request.Messages[i].Content = contents
+						}
+						break
+					}
+				}
 			}
 		}