feat: support openai images edits api

relay/adaptor/common.go

@@ -5,6 +5,7 @@ import (
 	"net/http"
 
 	"github.com/Laisky/errors/v2"
+	"github.com/Laisky/one-api/common/ctxkey"
 	"github.com/Laisky/one-api/relay/client"
 	"github.com/Laisky/one-api/relay/meta"
 	"github.com/gin-gonic/gin"
@@ -30,7 +31,7 @@ func DoRequestHelper(a Adaptor, c *gin.Context, meta *meta.Meta, requestBody io.
 		return nil, errors.Wrap(err, "new request failed")
 	}
 
-	req.Header.Add("Content-Type", "application/json")
+	req.Header.Set("Content-Type", c.GetString(ctxkey.ContentType))
 
 	err = a.SetupRequestHeader(c, req, meta)
 	if err != nil {

relay/adaptor/openai/adaptor.go

@@ -93,10 +93,13 @@ func (a *Adaptor) DoResponse(c *gin.Context, resp *http.Response, meta *meta.Met
 		switch meta.Mode {
 		case relaymode.ImagesGenerations:
 			err, _ = ImageHandler(c, resp)
+		case relaymode.ImagesEdits:
+			err, _ = ImagesEditsHandler(c, resp)
 		default:
 			err, usage = Handler(c, resp, meta.PromptTokens, meta.ActualModelName)
 		}
 	}
+
 	return
 }
 

relay/adaptor/openai/image.go

@@ -3,12 +3,30 @@ package openai
 import (
 	"bytes"
 	"encoding/json"
-	"github.com/Laisky/one-api/relay/model"
-	"github.com/gin-gonic/gin"
 	"io"
 	"net/http"
+
+	"github.com/Laisky/one-api/relay/model"
+	"github.com/gin-gonic/gin"
 )
 
+// ImagesEditsHandler just copy response body to client
+//
+// https://platform.openai.com/docs/api-reference/images/createEdit
+func ImagesEditsHandler(c *gin.Context, resp *http.Response) (*model.ErrorWithStatusCode, *model.Usage) {
+	c.Writer.WriteHeader(resp.StatusCode)
+	for k, v := range resp.Header {
+		c.Writer.Header().Set(k, v[0])
+	}
+
+	if _, err := io.Copy(c.Writer, resp.Body); err != nil {
+		return ErrorWrapper(err, "copy_response_body_failed", http.StatusInternalServerError), nil
+	}
+	defer resp.Body.Close()
+
+	return nil, nil
+}
+
 func ImageHandler(c *gin.Context, resp *http.Response) (*model.ErrorWithStatusCode, *model.Usage) {
 	var imageResponse ImageResponse
 	responseBody, err := io.ReadAll(resp.Body)