fix: improve error handling for image URL fetching and validation

common/image/image.go

@@ -3,7 +3,6 @@ package image
 import (
 	"bytes"
 	"encoding/base64"
-	"github.com/songquanpeng/one-api/common/client"
 	"image"
 	_ "image/gif"
 	_ "image/jpeg"
@@ -13,6 +12,9 @@ import (
 	"strings"
 	"sync"
 
+	"github.com/pkg/errors"
+	"github.com/songquanpeng/one-api/common/client"
+
 	_ "golang.org/x/image/webp"
 )
 
@@ -22,27 +24,36 @@ var dataURLPattern = regexp.MustCompile(`data:image/([^;]+);base64,(.*)`)
 func IsImageUrl(url string) (bool, error) {
 	resp, err := client.UserContentRequestHTTPClient.Head(url)
 	if err != nil {
-		return false, err
+		return false, errors.Wrapf(err, "failed to fetch image URL: %s", url)
 	}
-	if !strings.HasPrefix(resp.Header.Get("Content-Type"), "image/") {
-		return false, nil
+
+	if resp.StatusCode != http.StatusOK {
+		return false, errors.Errorf("failed to fetch image URL: %s, status code: %d", url, resp.StatusCode)
 	}
+
+	if resp.ContentLength > 10*1024*1024 {
+		return false, errors.Errorf("image size should not exceed 10MB: %s, size: %d", url, resp.ContentLength)
+	}
+
 	return true, nil
 }
 
 func GetImageSizeFromUrl(url string) (width int, height int, err error) {
 	isImage, err := IsImageUrl(url)
+	if err != nil {
+		return 0, 0, errors.Wrap(err, "failed to fetch image URL")
+	}
 	if !isImage {
-		return
+		return 0, 0, errors.New("not an image URL")
 	}
 	resp, err := client.UserContentRequestHTTPClient.Get(url)
 	if err != nil {
-		return
+		return 0, 0, errors.Wrap(err, "failed to get image from URL")
 	}
 	defer resp.Body.Close()
 	img, _, err := image.DecodeConfig(resp.Body)
 	if err != nil {
-		return
+		return 0, 0, errors.Wrap(err, "failed to decode image")
 	}
 	return img.Width, img.Height, nil
 }
@@ -58,22 +69,26 @@ func GetImageFromUrl(url string) (mimeType string, data string, err error) {
 	}
 
 	isImage, err := IsImageUrl(url)
-	if !isImage {
-		return
+	if err != nil {
+		return mimeType, data, errors.Wrap(err, "failed to fetch image URL")
 	}
+	if !isImage {
+		return mimeType, data, errors.New("not an image URL")
+	}
+
 	resp, err := http.Get(url)
 	if err != nil {
-		return
+		return mimeType, data, errors.Wrap(err, "failed to get image from URL")
 	}
 	defer resp.Body.Close()
 	buffer := bytes.NewBuffer(nil)
 	_, err = buffer.ReadFrom(resp.Body)
 	if err != nil {
-		return
+		return mimeType, data, errors.Wrap(err, "failed to read image data from response")
 	}
 	mimeType = resp.Header.Get("Content-Type")
 	data = base64.StdEncoding.EncodeToString(buffer.Bytes())
-	return
+	return mimeType, data, nil
 }
 
 var (