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package main
import (
_ "embed"
"io"
"log"
"net/http"
"os"
"path/filepath"
"strings"
)
//go:embed README
var readme string
var uploadDir = "."
func handleRoot(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodGet {
http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
return
}
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
w.Write([]byte(readme))
}
func handleUpload(w http.ResponseWriter, r *http.Request) {
// Show README on GET /
if r.Method == http.MethodGet && r.URL.Path == "/" {
handleRoot(w, r)
return
}
if r.Method != http.MethodPut {
http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
return
}
// Extract filename from URL path, preventing path traversal
filename := strings.TrimPrefix(r.URL.Path, "/")
if filename == "" {
http.Error(w, "filename required", http.StatusBadRequest)
return
}
// Prevent path traversal
filename = filepath.Clean(filename)
if strings.HasPrefix(filename, "..") {
http.Error(w, "invalid filename", http.StatusBadRequest)
return
}
fullPath := filepath.Join(uploadDir, filename)
// Ensure the directory exists
dir := filepath.Dir(fullPath)
if err := os.MkdirAll(dir, 0755); err != nil {
log.Printf("failed to create directory: %v", err)
http.Error(w, "internal server error", http.StatusInternalServerError)
return
}
// Create the file
f, err := os.Create(fullPath)
if err != nil {
log.Printf("failed to create file: %v", err)
http.Error(w, "internal server error", http.StatusInternalServerError)
return
}
defer f.Close()
// Copy request body to file
written, err := io.Copy(f, r.Body)
if err != nil {
log.Printf("failed to write file: %v", err)
http.Error(w, "internal server error", http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
w.WriteHeader(http.StatusCreated)
w.Write([]byte("ok\n"))
log.Printf("uploaded %s (%d bytes)", filename, written)
}
func main() {
if envUploadDir := os.Getenv("UPLOAD_DIR"); envUploadDir != "" {
uploadDir = envUploadDir
}
port := os.Getenv("PORT")
if port == "" {
port = "8080"
}
http.HandleFunc("/", handleUpload)
log.Printf("starting ganyupload on port %s, upload directory: %s", port, uploadDir)
if err := http.ListenAndServe(":"+port, nil); err != nil {
log.Fatalf("server error: %v", err)
}
}
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