116 lines
3.0 KiB
Go
116 lines
3.0 KiB
Go
package util
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import (
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"encoding/json"
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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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// SaveTempFileByType
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// 根据传入的数据自动判断:
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// 若是 []byte 且后缀为 .mp3 → 保存二进制音频
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// 若是任意结构体/map → 自动转 JSON 保存
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// 返回:新临时文件路径、错误
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func SaveTempFileByType(taskID string, data any, oldTmpFile string) (string, error) {
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// 1. 先清理旧临时文件(统一逻辑)
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if oldTmpFile != "" {
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_ = os.Remove(oldTmpFile)
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}
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var tmpPath string
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var tmpErr error
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// 2. 判断是否是二进制音频([]byte + .mp3)
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if audioData, ok := data.([]byte); ok {
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tmpPath, tmpErr = saveTmpResult(taskID, audioData, ".mp3")
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} else {
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// 3. 其他类型 → 序列化为 JSON 保存
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mappedBytes, err := json.Marshal(data)
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if err != nil {
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return "", err
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}
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if len(mappedBytes) == 0 {
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return "", nil
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}
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tmpPath, tmpErr = saveTmpResult(taskID, mappedBytes, ".json")
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}
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if tmpErr != nil || tmpPath == "" {
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return "", tmpErr
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}
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return tmpPath, nil
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}
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// saveTmpResult 你原有的底层保存文件方法(保留不动)
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func saveTmpResult(taskID string, data []byte, ext string) (string, error) {
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// 你原来实现,比如:
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filename := taskID + ext
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tmpPath := filepath.Join(os.TempDir(), filename)
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err := os.WriteFile(tmpPath, data, 0644)
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return tmpPath, err
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}
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