first commit: one-api base code + SAAS plan document

common/image/image.go

@@ -0,0 +1,112 @@
+package image
+
+import (
+	"bytes"
+	"encoding/base64"
+	"github.com/songquanpeng/one-api/common/client"
+	"image"
+	_ "image/gif"
+	_ "image/jpeg"
+	_ "image/png"
+	"net/http"
+	"regexp"
+	"strings"
+	"sync"
+
+	_ "golang.org/x/image/webp"
+)
+
+// Regex to match data URL pattern
+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
+	}
+	if !strings.HasPrefix(resp.Header.Get("Content-Type"), "image/") {
+		return false, nil
+	}
+	return true, nil
+}
+
+func GetImageSizeFromUrl(url string) (width int, height int, err error) {
+	isImage, err := IsImageUrl(url)
+	if !isImage {
+		return
+	}
+	resp, err := client.UserContentRequestHTTPClient.Get(url)
+	if err != nil {
+		return
+	}
+	defer resp.Body.Close()
+	img, _, err := image.DecodeConfig(resp.Body)
+	if err != nil {
+		return
+	}
+	return img.Width, img.Height, nil
+}
+
+func GetImageFromUrl(url string) (mimeType string, data string, err error) {
+	// Check if the URL is a data URL
+	matches := dataURLPattern.FindStringSubmatch(url)
+	if len(matches) == 3 {
+		// URL is a data URL
+		mimeType = "image/" + matches[1]
+		data = matches[2]
+		return
+	}
+
+	isImage, err := IsImageUrl(url)
+	if !isImage {
+		return
+	}
+	resp, err := http.Get(url)
+	if err != nil {
+		return
+	}
+	defer resp.Body.Close()
+	buffer := bytes.NewBuffer(nil)
+	_, err = buffer.ReadFrom(resp.Body)
+	if err != nil {
+		return
+	}
+	mimeType = resp.Header.Get("Content-Type")
+	data = base64.StdEncoding.EncodeToString(buffer.Bytes())
+	return
+}
+
+var (
+	reg = regexp.MustCompile(`data:image/([^;]+);base64,`)
+)
+
+var readerPool = sync.Pool{
+	New: func() interface{} {
+		return &bytes.Reader{}
+	},
+}
+
+func GetImageSizeFromBase64(encoded string) (width int, height int, err error) {
+	decoded, err := base64.StdEncoding.DecodeString(reg.ReplaceAllString(encoded, ""))
+	if err != nil {
+		return 0, 0, err
+	}
+
+	reader := readerPool.Get().(*bytes.Reader)
+	defer readerPool.Put(reader)
+	reader.Reset(decoded)
+
+	img, _, err := image.DecodeConfig(reader)
+	if err != nil {
+		return 0, 0, err
+	}
+
+	return img.Width, img.Height, nil
+}
+
+func GetImageSize(image string) (width int, height int, err error) {
+	if strings.HasPrefix(image, "data:image/") {
+		return GetImageSizeFromBase64(image)
+	}
+	return GetImageSizeFromUrl(image)
+}