ai-gateway/controller/relay-image.go

package controller

import (
	"bytes"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"net/http"
	"one-api/common"
	"one-api/model"

	"github.com/gin-gonic/gin"
)

func relayImageHelper(c *gin.Context, relayMode int) *OpenAIErrorWithStatusCode {
	imageModel := "dall-e"

	tokenId := c.GetInt("token_id")
	channelType := c.GetInt("channel")
	userId := c.GetInt("id")
	consumeQuota := c.GetBool("consume_quota")
	group := c.GetString("group")

	var imageRequest ImageRequest
	if consumeQuota {
		err := common.UnmarshalBodyReusable(c, &imageRequest)
		if err != nil {
			return errorWrapper(err, "bind_request_body_failed", http.StatusBadRequest)
		}
	}

	// Prompt validation
	if imageRequest.Prompt == "" {
		return errorWrapper(errors.New("prompt is required"), "required_field_missing", http.StatusBadRequest)
	}

	// Not "256x256", "512x512", or "1024x1024"
	if imageRequest.Size != "" && imageRequest.Size != "256x256" && imageRequest.Size != "512x512" && imageRequest.Size != "1024x1024" {
		return errorWrapper(errors.New("size must be one of 256x256, 512x512, or 1024x1024"), "invalid_field_value", http.StatusBadRequest)
	}

	// N should between 1 and 10
	if imageRequest.N != 0 && (imageRequest.N < 1 || imageRequest.N > 10) {
		return errorWrapper(errors.New("n must be between 1 and 10"), "invalid_field_value", http.StatusBadRequest)
	}

	// map model name
	modelMapping := c.GetString("model_mapping")
	isModelMapped := false
	if modelMapping != "" {
		modelMap := make(map[string]string)
		err := json.Unmarshal([]byte(modelMapping), &modelMap)
		if err != nil {
			return errorWrapper(err, "unmarshal_model_mapping_failed", http.StatusInternalServerError)
		}
		if modelMap[imageModel] != "" {
			imageModel = modelMap[imageModel]
			isModelMapped = true
		}
	}

	baseURL := common.ChannelBaseURLs[channelType]
	requestURL := c.Request.URL.String()

	if c.GetString("base_url") != "" {
		baseURL = c.GetString("base_url")
	}

	fullRequestURL := fmt.Sprintf("%s%s", baseURL, requestURL)

	var requestBody io.Reader
	if isModelMapped {
		jsonStr, err := json.Marshal(imageRequest)
		if err != nil {
			return errorWrapper(err, "marshal_text_request_failed", http.StatusInternalServerError)
		}
		requestBody = bytes.NewBuffer(jsonStr)
	} else {
		requestBody = c.Request.Body
	}

	modelRatio := common.GetModelRatio(imageModel)
	groupRatio := common.GetGroupRatio(group)
	ratio := modelRatio * groupRatio
	userQuota, err := model.CacheGetUserQuota(userId)

	sizeRatio := 1.0
	// Size
	if imageRequest.Size == "256x256" {
		sizeRatio = 1
	} else if imageRequest.Size == "512x512" {
		sizeRatio = 1.125
	} else if imageRequest.Size == "1024x1024" {
		sizeRatio = 1.25
	}
	quota := int(ratio*sizeRatio*1000) * imageRequest.N

	if consumeQuota && userQuota-quota < 0 {
		return errorWrapper(err, "insufficient_user_quota", http.StatusForbidden)
	}

	req, err := http.NewRequest(c.Request.Method, fullRequestURL, requestBody)
	if err != nil {
		return errorWrapper(err, "new_request_failed", http.StatusInternalServerError)
	}
	req.Header.Set("Authorization", c.Request.Header.Get("Authorization"))

	req.Header.Set("Content-Type", c.Request.Header.Get("Content-Type"))
	req.Header.Set("Accept", c.Request.Header.Get("Accept"))

	resp, err := httpClient.Do(req)
	if err != nil {
		return errorWrapper(err, "do_request_failed", http.StatusInternalServerError)
	}

	err = req.Body.Close()
	if err != nil {
		return errorWrapper(err, "close_request_body_failed", http.StatusInternalServerError)
	}
	err = c.Request.Body.Close()
	if err != nil {
		return errorWrapper(err, "close_request_body_failed", http.StatusInternalServerError)
	}
	var textResponse ImageResponse

	defer func() {
		if consumeQuota {
			err := model.PostConsumeTokenQuota(tokenId, quota)
			if err != nil {
				common.SysError("error consuming token remain quota: " + err.Error())
			}
			err = model.CacheUpdateUserQuota(userId)
			if err != nil {
				common.SysError("error update user quota cache: " + err.Error())
			}
			if quota != 0 {
				tokenName := c.GetString("token_name")
				logContent := fmt.Sprintf("模型倍率 %.2f，分组倍率 %.2f", modelRatio, groupRatio)
				model.RecordConsumeLog(userId, 0, 0, imageModel, tokenName, quota, logContent)
				model.UpdateUserUsedQuotaAndRequestCount(userId, quota)
				channelId := c.GetInt("channel_id")
				model.UpdateChannelUsedQuota(channelId, quota)
			}
		}
	}()

	if consumeQuota {
		responseBody, err := io.ReadAll(resp.Body)

		if err != nil {
			return errorWrapper(err, "read_response_body_failed", http.StatusInternalServerError)
		}
		err = resp.Body.Close()
		if err != nil {
			return errorWrapper(err, "close_response_body_failed", http.StatusInternalServerError)
		}
		err = json.Unmarshal(responseBody, &textResponse)
		if err != nil {
			return errorWrapper(err, "unmarshal_response_body_failed", http.StatusInternalServerError)
		}

		resp.Body = io.NopCloser(bytes.NewBuffer(responseBody))
	}

	for k, v := range resp.Header {
		c.Writer.Header().Set(k, v[0])
	}
	c.Writer.WriteHeader(resp.StatusCode)

	_, err = io.Copy(c.Writer, resp.Body)
	if err != nil {
		return errorWrapper(err, "copy_response_body_failed", http.StatusInternalServerError)
	}
	err = resp.Body.Close()
	if err != nil {
		return errorWrapper(err, "close_response_body_failed", http.StatusInternalServerError)
	}
	return nil
}