feat: added endpoint to return filename and size

server/main.go

@@ -6,6 +6,7 @@ import (
 	"crypto/rand"
 	"database/sql"
 	"encoding/hex"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
@@ -31,6 +32,7 @@ func main() {
 	router := mux.NewRouter()
 	router.HandleFunc("/upload", handleUpload).Methods("POST")
 	router.HandleFunc("/download/{id}", handleDownload).Methods("GET")
+	router.HandleFunc("/get/{id}", handleGetFileInfo).Methods("GET")
 
 	handler := cors.New(cors.Options{
 		AllowedOrigins: []string{"*"},
@@ -129,6 +131,49 @@ func handleDownload(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+func handleGetFileInfo(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	id := vars["id"]
+
+	keyHex := r.URL.Query().Get("key")
+	key, err := hex.DecodeString(keyHex)
+	if err != nil {
+		handleError(w, errors.New("invalid key"), http.StatusBadRequest)
+		return
+	}
+
+	fileName, encryptedData, err := getFileFromDB(id)
+	if err != nil {
+		handleError(w, err, http.StatusInternalServerError)
+		return
+	}
+
+	plaintext, err := decryptFile(encryptedData, key)
+	if err != nil {
+		handleError(w, errors.New("error decrypting file"), http.StatusInternalServerError)
+		return
+	}
+
+	fileSizeBytes := len(plaintext)
+	var fileSize string
+	if fileSizeBytes >= 1024*1024 {
+		fileSize = fmt.Sprintf("%.2f MB", float64(fileSizeBytes)/(1024*1024))
+	} else {
+		fileSize = fmt.Sprintf("%.2f KB", float64(fileSizeBytes)/1024)
+	}
+
+	fileInfo := struct {
+		FileName string `json:"fileName"`
+		FileSize string `json:"fileSize"`
+	}{
+		FileName: fileName,
+		FileSize: fileSize,
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(fileInfo)
+}
+
 func storeFileInDB(id, fileName string, encryptedData []byte) error {
 	tx, err := db.Begin()
 	if err != nil {