feat: support set system prompt for channel (close #1920)

common/ctxkey/key.go

@@ -20,4 +20,5 @@ const (
 	BaseURL           = "base_url"
 	AvailableModels   = "available_models"
 	KeyRequestBody    = "key_request_body"
+	SystemPrompt      = "system_prompt"
 )

middleware/distributor.go

@@ -61,6 +61,9 @@ func SetupContextForSelectedChannel(c *gin.Context, channel *model.Channel, mode
 	c.Set(ctxkey.Channel, channel.Type)
 	c.Set(ctxkey.ChannelId, channel.Id)
 	c.Set(ctxkey.ChannelName, channel.Name)
+	if channel.SystemPrompt != nil && *channel.SystemPrompt != "" {
+		c.Set(ctxkey.SystemPrompt, *channel.SystemPrompt)
+	}
 	c.Set(ctxkey.ModelMapping, channel.GetModelMapping())
 	c.Set(ctxkey.OriginalModel, modelName) // for retry
 	c.Request.Header.Set("Authorization", fmt.Sprintf("Bearer %s", channel.Key))

model/channel.go

@@ -37,6 +37,7 @@ type Channel struct {
 	ModelMapping       *string `json:"model_mapping" gorm:"type:varchar(1024);default:''"`
 	Priority           *int64  `json:"priority" gorm:"bigint;default:0"`
 	Config             string  `json:"config"`
+	SystemPrompt       *string `json:"system_prompt" gorm:"type:text"`
 }
 
 type ChannelConfig struct {

relay/constant/role/define.go

@@ -1,5 +1,6 @@
 package role
 
 const (
+	System    = "system"
 	Assistant = "assistant"
 )

relay/controller/helper.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"github.com/songquanpeng/one-api/relay/constant/role"
 	"math"
 	"net/http"
 	"strings"
@@ -154,3 +155,22 @@ func isErrorHappened(meta *meta.Meta, resp *http.Response) bool {
 	}
 	return false
 }
+
+func setSystemPrompt(ctx context.Context, request *relaymodel.GeneralOpenAIRequest, prompt string) {
+	if prompt == "" {
+		return
+	}
+	if len(request.Messages) == 0 {
+		return
+	}
+	if request.Messages[0].Role == role.System {
+		request.Messages[0].Content = prompt
+		logger.Infof(ctx, "rewrite system prompt")
+		return
+	}
+	request.Messages = append([]relaymodel.Message{{
+		Role:    role.System,
+		Content: prompt,
+	}}, request.Messages...)
+	logger.Infof(ctx, "add system prompt")
+}

relay/controller/text.go

@@ -36,6 +36,8 @@ func RelayTextHelper(c *gin.Context) *model.ErrorWithStatusCode {
 	meta.OriginModelName = textRequest.Model
 	textRequest.Model, _ = getMappedModelName(textRequest.Model, meta.ModelMapping)
 	meta.ActualModelName = textRequest.Model
+	// set system prompt if not empty
+	setSystemPrompt(ctx, textRequest, meta.SystemPrompt)
 	// get model ratio & group ratio
 	modelRatio := billingratio.GetModelRatio(textRequest.Model, meta.ChannelType)
 	groupRatio := billingratio.GetGroupRatio(meta.Group)

relay/meta/relay_meta.go

@@ -30,6 +30,7 @@ type Meta struct {
 	ActualModelName string
 	RequestURLPath  string
 	PromptTokens    int // only for DoResponse
+	SystemPrompt    string
 }
 
 func GetByContext(c *gin.Context) *Meta {
@@ -46,6 +47,7 @@ func GetByContext(c *gin.Context) *Meta {
 		BaseURL:         c.GetString(ctxkey.BaseURL),
 		APIKey:          strings.TrimPrefix(c.Request.Header.Get("Authorization"), "Bearer "),
 		RequestURLPath:  c.Request.URL.String(),
+		SystemPrompt:    c.GetString(ctxkey.SystemPrompt),
 	}
 	cfg, ok := c.Get(ctxkey.Config)
 	if ok {

web/default/src/pages/Channel/EditChannel.js

@@ -43,6 +43,7 @@ const EditChannel = () => {
     base_url: '',
     other: '',
     model_mapping: '',
+    system_prompt: '',
     models: [],
     groups: ['default']
   };
@@ -425,7 +426,7 @@ const EditChannel = () => {
             )
           }
           {
-          inputs.type !== 43 && (
+          inputs.type !== 43 && (<>
               <Form.Field>
                 <Form.TextArea
                   label='模型重定向'
@@ -437,6 +438,18 @@ const EditChannel = () => {
                   autoComplete='new-password'
                 />
               </Form.Field>
+            <Form.Field>
+                <Form.TextArea
+                  label='系统提示词'
+                  placeholder={`此项可选，用于强制设置给定的系统提示词，请配合自定义模型 & 模型重定向使用，首先创建一个唯一的自定义模型名称并在上面填入，之后将该自定义模型重定向映射到该渠道一个原生支持的模型`}
+                  name='system_prompt'
+                  onChange={handleInputChange}
+                  value={inputs.system_prompt}
+                  style={{ minHeight: 150, fontFamily: 'JetBrains Mono, Consolas' }}
+                  autoComplete='new-password'
+                />
+              </Form.Field>
+              </>
             )
           }
           {