Function imageEditDecodeDataURL

initialize/handlers.go:983–1024

imageEditDecodeDataURL 解析 data:image/...;base64,XXXX 形式的 URL。

(url string)

// imageEditDecodeDataURL 解析 data:image/...;base64,XXXX 形式的 URL。
func imageEditDecodeDataURL(url string) (editImageInput, error) {
	comma := strings.Index(url, ",")
	if comma < 0 {
		return editImageInput{}, fmt.Errorf("invalid data URL")
	}
	header := url[:comma]
	payload := url[comma+1:]
	contentType := "image/png"
	if semi := strings.Index(header, ";"); semi > 5 {
		// 形如 data:image/png;base64
		contentType = header[5:semi]
		if !strings.HasPrefix(contentType, "image/") {
			return editImageInput{}, fmt.Errorf("data URL must be an image, got %q", contentType)
		}
	}
	// 简单 base64 解码;若包含 URL 编码等其他格式,退回 base64.URLEncoding
	dec := base64.StdEncoding
	if strings.Contains(header, ";base64") {
		dec = base64.StdEncoding
	} else {
		dec = base64.URLEncoding
	}
	raw, err := dec.DecodeString(payload)
	if err != nil {
		// 兜底再用 StdEncoding 试一次,容忍格式不严格的输入
		raw, err = base64.StdEncoding.DecodeString(payload)
		if err != nil {
			return editImageInput{}, err
		}
		contentType = "image/png"
	}
	ext := "png"
	switch strings.ToLower(contentType) {
	case "image/jpeg":
		ext = "jpg"
	case "image/gif":
		ext = "gif"
	case "image/webp":
		ext = "webp"
	}
	return imageEditReadJSONImage(raw, "image_url."+ext, contentType)
}

// imageEditDownloadHTTPURL 下载一个 https/http 图片并包装为 editImageInput。
func imageEditDownloadHTTPURL(client httpclient.AuroraHttpClient, url string) (editImageInput, error) {