the first version

file.go

@@ -0,0 +1,108 @@
+package main
+
+import (
+	"net/http"
+	"os"
+	"path/filepath"
+)
+
+// ListFiles function: Traverse all files in the specified directory and return a slice of the file path
+func ListFiles(dir string) ([]string, error) {
+	var files []string
+	err := filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if !info.IsDir() {
+			files = append(files, path)
+		}
+		return nil
+	})
+	return files, err
+}
+
+// Get Content function: Read the content of a specified file and return it
+func GetFileContent(filePath string) ([]byte, error) {
+	file, err := os.Open(filePath)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	// Get File Size
+	fileInfo, err := file.Stat()
+	if err != nil {
+		return nil, err
+	}
+	fileSize := fileInfo.Size()
+
+	// Read File Content
+	fileContent := make([]byte, fileSize)
+	_, err = file.Read(fileContent)
+	if err != nil {
+		return nil, err
+	}
+
+	return fileContent, nil
+}
+
+// fileHandler function: Handle file requests
+func fileHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Server", "MeowMusicEmbeddedServer")
+	// Obtain the path of the request
+	filePath := r.URL.Path
+
+	// Construct the complete file path
+	fullFilePath := filepath.Join("./files", filePath)
+
+	// Get file content
+	fileContent, err := GetFileContent(fullFilePath)
+	if err != nil {
+		NotFoundHandler(w, r)
+		return
+	}
+
+	// Set appropriate Content-Type based on file extension
+	ext := filepath.Ext(filePath)
+	switch ext {
+	case ".mp3":
+		w.Header().Set("Content-Type", "audio/mpeg")
+	case ".wav":
+		w.Header().Set("Content-Type", "audio/wav")
+	case ".flac":
+		w.Header().Set("Content-Type", "audio/flac")
+	case ".aac":
+		w.Header().Set("Content-Type", "audio/aac")
+	case ".ogg":
+		w.Header().Set("Content-Type", "audio/ogg")
+	case ".m4a":
+		w.Header().Set("Content-Type", "audio/mp4")
+	case ".amr":
+		w.Header().Set("Content-Type", "audio/amr")
+	case ".jpg", ".jpeg":
+		w.Header().Set("Content-Type", "image/jpeg")
+	case ".png":
+		w.Header().Set("Content-Type", "image/png")
+	case ".gif":
+		w.Header().Set("Content-Type", "image/gif")
+	case ".bmp":
+		w.Header().Set("Content-Type", "image/bmp")
+	case ".svg":
+		w.Header().Set("Content-Type", "image/svg+xml")
+	case ".webp":
+		w.Header().Set("Content-Type", "image/webp")
+	case ".txt":
+		w.Header().Set("Content-Type", "text/plain")
+	case ".lrc":
+		w.Header().Set("Content-Type", "text/plain")
+	case ".mrc":
+		w.Header().Set("Content-Type", "text/plain")
+	case ".json":
+		w.Header().Set("Content-Type", "application/json")
+	default:
+		w.Header().Set("Content-Type", "application/octet-stream")
+	}
+
+	// Write file content to response
+	w.Write(fileContent)
+}