70 lines
1.7 KiB
Go
70 lines
1.7 KiB
Go
package util
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import (
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"fmt"
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"net/http"
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"os"
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"path/filepath"
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"strings"
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)
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// DetectFileType 根据返回的二进制内容推断 contentType + 扩展名（尽量稳定）
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func DetectFileType(data []byte) (contentType string, ext string) {
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if len(data) == 0 {
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return "application/octet-stream", ""
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}
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ct := http.DetectContentType(data)
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// gateway.DetectContentType 可能带 charset 等参数：text/plain; charset=utf-8
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if idx := strings.Index(ct, ";"); idx > 0 {
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ct = strings.TrimSpace(ct[:idx])
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}
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switch ct {
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case "audio/mpeg":
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return ct, ".mp3"
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case "audio/wave", "audio/wav", "audio/x-wav":
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return ct, ".wav"
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case "video/mp4":
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return ct, ".mp4"
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case "image/png":
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return ct, ".png"
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case "image/jpeg":
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return ct, ".jpg"
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case "application/pdf":
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return ct, ".pdf"
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case "text/plain":
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return ct, ".txt"
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case "application/json":
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return ct, ".json"
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default:
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// 兜底：尝试从 ct 截取 subtype 作为后缀（例如 application/json）
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if parts := strings.Split(ct, "/"); len(parts) == 2 {
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sub := parts[1]
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// 避免出现 "plain; charset=utf-8" 之类的后缀
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if idx := strings.Index(sub, ";"); idx > 0 {
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sub = strings.TrimSpace(sub[:idx])
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}
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return ct, "." + sub
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}
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return ct, ""
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}
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}
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// SaveTmpResult 将模型输出写入临时文件，用于 OSS 上传失败后的“仅重试 OSS”。
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func SaveTmpResult(taskID string, data []byte, ext string) (string, error) {
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dir := filepath.Join(os.TempDir(), "model-asynch")
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if err := os.MkdirAll(dir, 0o755); err != nil {
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return "", err
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}
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if ext == "" {
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ext = ".bin"
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}
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if ext[0] != '.' {
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ext = "." + ext
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}
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path := filepath.Join(dir, fmt.Sprintf("%s%s", taskID, ext))
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if err := os.WriteFile(path, data, 0o644); err != nil {
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return "", err
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}
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return path, nil
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}
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