feat: Add file preview functionality and enhance file handling

- Added `FilePreviewer` component to handle different file types (images, markdown, PDFs, and text).
- Integrated `react-easy-crop` for image cropping in `ImagePreview`.
- Implemented PDF viewing with pagination using `react-pdf`.
- Updated `FilesComponent` to support file previews and downloads.
- Refactored API calls to use a centralized `apiCall` function for better token management.
- Enhanced `Login` and `Register` components to utilize the new API client.
- Removed unused theme toggle functionality from `SettingsComponent`.
- Improved shared files display in `ShareComponent` with a table layout.
- Added error handling and loading states for file operations.
- Updated dependencies in `package.json` for new features.

.gitignore

@@ -11,27 +11,22 @@ Cargo.lock
 # See https://www.dartlang.org/guides/libraries/private-files
 
 # Files and directories created by pub
-lightcloud_app/dart_tool/
-lightcloud_app/packages
-lightcloud_app/build/
-# If you're building an application, you may want to check-in your pubspec.lock
-lightcloud_app/pubspec.lock
+frontend/node_modules/
 
-# Directory created by dartdoc
-# If you don't generate documentation locally you can remove this line.
-lightcloud_app/doc/api/
-
-# dotenv environment variables file
-lightcloud_app/.env*
-
-# Avoid committing generated Javascript files:
-lightcloud_app/*.dart.js
-lightcloud_app/*.info.json      # Produced by the --dump-info flag.
-lightcloud_app/*.js             # When generated by dart2js. Don't specify *.js if your
-                 # project includes source files written in JavaScript.
-lightcloud_app/.js_
-lightcloud_app/*.js.deps
-lightcloud_app/*.js.map
-
-lightcloud_app/.flutter-plugins
-lightcloud_app/.flutter-plugins-dependencies
+# Ignora file e cartelle Node.js nella sottocartella frontend
+/frontend/node_modules/
+/frontend/dist/
+/frontend/build/
+/frontend/.next/
+/frontend/.turbo/
+/frontend/.cache/
+/frontend/.eslintcache
+/frontend/npm-debug.log*
+/frontend/yarn-debug.log*
+/frontend/yarn-error.log*
+/frontend/pnpm-debug.log*
+/frontend/package-lock.json
+/frontend/yarn.lock
+/frontend/pnpm-lock.yaml
+/frontend/.env
+/frontend/.env.*

api/src/file.rs

@@ -36,7 +36,7 @@ pub async fn upload_file(
 
     let file_id = Uuid::new_v4().to_string();
     let user_id = user.user_id.ok_or(Status::BadRequest)?;
-    let user_dir = format!("./data/{}", user_id);
+    let user_dir = format!("/wdblue/litecloud-store/{}", user_id);
     let storage_path = format!("{}/{}", &user_dir, file_id);
 
     fs::create_dir_all(&user_dir).await.map_err(|_| Status::InternalServerError)?;
@@ -327,4 +327,4 @@ pub async fn list_user_shares(pool: &State<PgPool>, user: AuthenticatedUser) ->
         .collect();
     
     Json(share_infos)
-}
+}

api/src/main.rs

@@ -1,27 +1,21 @@
 #[macro_use]
 extern crate rocket;
-
-use rocket::{fs::FileServer, Request};
+use rocket::fs::{FileServer, Options, relative};
+use rocket::Request;
 use rocket::serde::json::Json;
 use rocket::http::Status;
 use rocket::response::status::Custom;
 use rocket::data::ByteUnit;
-
-
 use sqlx::postgres::PgPoolOptions;
-
 use std::env;
 use dotenv::dotenv;
-
 use rocket_cors::{CorsOptions};
-
 mod auth;
 mod encryption;
 mod file;
 mod user;
 mod admin;
 mod models;
-
 use crate::file::*;
 use crate::user::*;
 use crate::admin::*;
@@ -39,14 +33,13 @@ fn all_options() -> &'static str {
 #[rocket::main]
 async fn main() -> Result<(), rocket::Error> {
     dotenv().ok();
-
     let db_url = env::var("DATABASE_URL").expect("DATABASE_URL not set");
     let pool = PgPoolOptions::new()
         .max_connections(5)
         .connect(&db_url)
         .await
         .expect("Failed to connect to database");
-
+    
     let figment = rocket::Config::figment()
         .merge(("port", 8082))
         .merge(("address", "0.0.0.0"))
@@ -54,10 +47,14 @@ async fn main() -> Result<(), rocket::Error> {
             .limit("form", ByteUnit::Gigabyte(5))   // 5 GB
             .limit("file", ByteUnit::Gigabyte(1))   // 1 GB
             .limit("data-form", ByteUnit::Gigabyte(5))  // 5 GB for multipart/form-data
-    ));
-    
+        ));
+   
+    let cors = CorsOptions::default()
+        .to_cors()
+        .expect("Failed to create CORS fairing");
     
     rocket::custom(figment)
+        .attach(cors)
         .manage(pool)
         .mount("/api", routes![
             register,
@@ -76,10 +73,10 @@ async fn main() -> Result<(), rocket::Error> {
             update_quota,
             all_options,
         ])
-        .mount("/", FileServer::from("./static").rank(10))
+        .mount("/", FileServer::new("./static", Options::Index | Options::DotFiles | Options::Missing))
         .register("/", catchers![not_found])
         .launch()
         .await?;
-
+    
     Ok(())
-}
+}

api/src/models.rs

@@ -25,7 +25,7 @@ pub struct File {
 #[derive(Debug, Serialize, Deserialize, sqlx::FromRow)]
 pub struct Share {
     pub id: Uuid,
-    pub file_id: Option<i32>,
+    pub file_id: Option<i32>,  // Changed to Option<i32>
     pub shared_by: i32,
     pub created_at: DateTime<Utc>,
     pub expires_at: Option<chrono::NaiveDateTime>,

frontend/package.json

@@ -12,8 +12,12 @@
   "dependencies": {
     "@tailwindcss/postcss": "^4.1.8",
     "lucide-react": "^0.513.0",
+    "pdfjs-dist": "^5.3.31",
     "react": "^19.1.0",
-    "react-dom": "^19.1.0"
+    "react-dom": "^19.1.0",
+    "react-easy-crop": "^5.4.2",
+    "react-markdown": "^10.1.0",
+    "react-pdf": "^9.2.1"
   },
   "devDependencies": {
     "@eslint/js": "^9.25.0",

frontend/src/App.tsx

@@ -76,7 +76,7 @@ export const App: React.FC = () => {
   return (
     <>
       <ThemeToggle isDarkMode={isDarkMode} onToggle={toggleTheme} />
-      <MainPage isDarkMode={isDarkMode} onLogout={handleLogout} />
+      <MainPage isDarkMode={isDarkMode} onLogout={handleLogout} onThemeToggle={toggleTheme} />
     </>
   );
 };

frontend/src/api/apiClient.ts

@@ -0,0 +1,23 @@
+// src/api/apiClient.ts
+
+export const getAuthToken = () => {
+  return localStorage.getItem('litecloud_token') || '';
+};
+
+export const apiCall = async (url: string, options: RequestInit = {}) => {
+  const token = getAuthToken();
+  const response = await fetch(url, {
+    ...options,
+    headers: {
+      'Authorization': `Bearer ${token}`,
+      'Content-Type': 'application/json',
+      ...options.headers,
+    },
+  });
+
+  if (!response.ok) {
+    throw new Error(`HTTP error! status: ${response.status}`);
+  }
+
+  return response;
+};

frontend/src/components/FileComponent.tsx

@@ -1,5 +1,7 @@
 import React, { useState, useEffect, useRef } from "react";
-import { ChevronDown, Upload, Share, Trash2 } from "lucide-react";
+import { Upload, Share, Trash2 } from "lucide-react";
+import { apiCall } from "../api/apiClient";
+import FilePreviewer from "./preview/FilePreviewer";
 
 interface File {
   id: number;
@@ -22,6 +24,8 @@ export const FilesComponent: React.FC<FilesComponentProps> = ({ isDarkMode }) =>
   const [openDropdown, setOpenDropdown] = useState<number | null>(null);
   const [token, setToken] = useState<string | null>(null);
   const [shareDuration, setShareDuration] = useState(7); // durata di default 7 giorni
+  const [previewFile, setPreviewFile] = useState<{ url: string; name: string } | null>(null);
+  const [previewBlobUrl, setPreviewBlobUrl] = useState<string | null>(null);
 
   const fileInputRef = useRef<HTMLInputElement>(null);
   const dropdownRef = useRef<HTMLTableDataCellElement | null>(null);
@@ -32,24 +36,6 @@ export const FilesComponent: React.FC<FilesComponentProps> = ({ isDarkMode }) =>
     setToken(storedToken);
   }, []);
 
-  const apiCall = async (url: string, options: RequestInit = {}) => {
-    if (!token) throw new Error('No auth token found');
-    const response = await fetch(url, {
-      ...options,
-      headers: {
-        'Authorization': `Bearer ${token}`,
-        'Content-Type': 'application/json',
-        ...options.headers,
-      },
-    });
-
-    if (!response.ok) {
-      throw new Error(`HTTP error! status: ${response.status}`);
-    }
-
-    return response;
-  };
-
   const fetchFiles = async () => {
     if (!token) return; // Non chiamare se il token non è pronto
     try {
@@ -149,27 +135,87 @@ export const FilesComponent: React.FC<FilesComponentProps> = ({ isDarkMode }) =>
     }
   };
 
-const formatDate = (dateString: string) => {
-  const now = new Date();
-  const date = new Date(dateString);
-  const diff = (now.getTime() - date.getTime()) / 1000;
+  const handleDownload = async (file: File) => {
+    try {
+      setLoading(true);
+      setError(null);
+      if (!token) throw new Error('No auth token found');
+      const response = await fetch(`/api/files/${file.id}`, {
+        headers: {
+          'Authorization': `Bearer ${token}`,
+        },
+      });
+      if (!response.ok) throw new Error('Download failed');
+      const blob = await response.blob();
+      const url = window.URL.createObjectURL(blob);
+      const a = document.createElement('a');
+      a.href = url;
+      a.download = file.original_name;
+      document.body.appendChild(a);
+      a.click();
+      a.remove();
+      window.URL.revokeObjectURL(url);
+    } catch (err) {
+      setError('Failed to download file');
+    } finally {
+      setLoading(false);
+      setOpenDropdown(null);
+    }
+  };
 
-  const isSameDay = (d1: Date, d2: Date) =>
-    d1.getFullYear() === d2.getFullYear() &&
-    d1.getMonth() === d2.getMonth() &&
-    d1.getDate() === d2.getDate();
+  // Funzione per ottenere e decriptare il file dal server
+  const handlePreviewFile = async (file: File) => {
+    try {
+      setLoading(true);
+      setError(null);
+      if (!token) throw new Error('No auth token found');
+      const response = await fetch(`/api/files/${file.id}`, {
+        headers: {
+          'Authorization': `Bearer ${token}`,
+        },
+      });
+      if (!response.ok) throw new Error('Impossibile scaricare il file');
+      const blob = await response.blob();
+      const blobUrl = URL.createObjectURL(blob);
+      setPreviewBlobUrl(blobUrl);
+      setPreviewFile({ url: blobUrl, name: file.original_name });
+    } catch (err) {
+      setError('Errore durante il download per anteprima');
+    } finally {
+      setLoading(false);
+    }
+  };
 
-  const yesterday = new Date();
-  yesterday.setDate(now.getDate() - 1);
+  // Pulisci la URL temporanea quando chiudi la preview
+  const handleClosePreview = () => {
+    if (previewBlobUrl) {
+      URL.revokeObjectURL(previewBlobUrl);
+      setPreviewBlobUrl(null);
+    }
+    setPreviewFile(null);
+  };
 
-  if (diff < 10) return "now";
+  const formatDate = (dateString: string) => {
+    const now = new Date();
+    const date = new Date(dateString);
+    const diff = (now.getTime() - date.getTime()) / 1000;
 
-  if (isSameDay(date, yesterday)) {
-    return `yesterday at ${date.toLocaleTimeString()}`;
-  }
+    const isSameDay = (d1: Date, d2: Date) =>
+      d1.getFullYear() === d2.getFullYear() &&
+      d1.getMonth() === d2.getMonth() &&
+      d1.getDate() === d2.getDate();
 
-  return date.toLocaleString();
-};
+    const yesterday = new Date();
+    yesterday.setDate(now.getDate() - 1);
+
+    if (diff < 10) return "now";
+
+    if (isSameDay(date, yesterday)) {
+      return `yesterday at ${date.toLocaleTimeString()}`;
+    }
+
+    return date.toLocaleString();
+  };
 
 
   const formatFileSize = (bytes: number) => {
@@ -179,6 +225,8 @@ const formatDate = (dateString: string) => {
     return Math.round(bytes / Math.pow(1024, i) * 100) / 100 + ' ' + sizes[i];
   };
 
+  // Funzione per ottenere la URL del file (puoi adattare se serve fetch protetto)
+
   return (
     <div className="component-container">
       {/* Success/Error Messages */}
@@ -195,6 +243,18 @@ const formatDate = (dateString: string) => {
         </div>
       )}
 
+      {/* Modal anteprima file */}
+      {previewFile && (
+        <div className="modal-overlay" style={{ position: 'fixed', top:0, left:0, right:0, bottom:0, background: 'rgba(0,0,0,0.85)', zIndex: 1000, display: 'flex', alignItems: 'stretch', justifyContent: 'center' }}>
+          <div className="modal-content" style={{ background: isDarkMode ? '#222' : '#fff', padding: 0, borderRadius: 0, width: '100vw', height: '100vh', maxWidth: '100vw', maxHeight: '100vh', overflow: 'auto', position: 'relative', display: 'flex', flexDirection: 'column' }}>
+            <button onClick={handleClosePreview} style={{ position: 'absolute', top: 16, right: 24, fontSize: 36, background: 'none', border: 'none', color: isDarkMode ? '#fff' : '#222', cursor: 'pointer', zIndex: 10 }}>×</button>
+            <div style={{ flex: 1, display: 'flex', alignItems: 'center', justifyContent: 'center', minHeight: 0, minWidth: 0 }}>
+              <FilePreviewer fileUrl={previewFile.url} fileName={previewFile.name} fullscreen />
+            </div>
+          </div>
+        </div>
+      )}
+
       <div className="component-header">
         <h1 className={`component-title ${isDarkMode ? 'text-white' : 'text-gray-800'}`}>
           My Files
@@ -237,7 +297,13 @@ const formatDate = (dateString: string) => {
           <tbody className={`table-body ${isDarkMode ? 'table-body-dark' : 'table-body-light'}`}> 
             {files.map((file) => (
               <tr key={file.id} className={isDarkMode ? 'table-row-dark' : 'table-row-light'}>
-                <td className={`table-cell ${isDarkMode ? 'text-white' : 'text-gray-900'}`}>{file.original_name}</td>
+                <td className={`table-cell ${isDarkMode ? 'text-white' : 'text-gray-900'}`}
+                  style={{ cursor: 'pointer', textDecoration: 'underline' }}
+                  onClick={() => handlePreviewFile(file)}
+                  title="Anteprima file"
+                >
+                  {file.original_name}
+                </td>
                 <td className={`table-cell ${isDarkMode ? 'text-gray-300' : 'text-gray-500'}`}>{formatFileSize(file.size)}</td>
                 <td className={`table-cell ${isDarkMode ? 'text-gray-300' : 'text-gray-500'}`}>{formatDate(file.uploaded_at)}</td>
                 <td className="table-cell relative actions-cell" ref={dropdownRef}>
@@ -280,6 +346,12 @@ const formatDate = (dateString: string) => {
                         <Trash2 size={16} />
                         Delete
                       </button>
+                      <button
+                        onClick={() => handleDownload(file)}
+                        className={`dropdown-item ${isDarkMode ? 'dropdown-item-dark' : 'dropdown-item-light'}`}
+                      >
+                        Download
+                      </button>
                     </div>
                   )}
                 </td>

frontend/src/components/Login.tsx

@@ -1,4 +1,5 @@
 import React, { useState } from "react";
+import { apiCall } from "../api/apiClient";
 
 interface LoginProps {
   onLoginSuccess: (token: string) => void;
@@ -22,7 +23,7 @@ export const Login: React.FC<LoginProps> = ({
     setError(null);
 
     try {
-      const res = await fetch("/api/login", {
+      const res = await apiCall("/api/login", {
         method: "POST",
         headers: { "Content-Type": "application/json" },
         body: JSON.stringify({ username, password }),

frontend/src/components/Register.tsx

@@ -1,4 +1,5 @@
 import React, { useState } from "react";
+import { apiCall } from "../api/apiClient";
 
 interface RegisterProps {
   onSwitchToLogin: () => void;
@@ -22,7 +23,7 @@ export const Register: React.FC<RegisterProps> = ({
     setSuccess(false);
 
     try {
-      const res = await fetch("/api/register", {
+      const res = await apiCall("/api/register", {
         method: "POST",
         headers: { "Content-Type": "application/json" },
         body: JSON.stringify({ username, password }),

frontend/src/components/Settings.tsx

@@ -1,5 +1,5 @@
 import React from "react";
-import { Sun, Moon, Palette } from "lucide-react";
+import {Palette} from "lucide-react";
 
 interface GradientColors {
   dark: { from: string; to: string };
@@ -15,7 +15,6 @@ interface SettingsComponentProps {
 
 export const SettingsComponent: React.FC<SettingsComponentProps> = ({
   isDarkMode,
-  onThemeToggle,
   gradientColors,
   setGradientColors
 }) => {
@@ -46,24 +45,6 @@ export const SettingsComponent: React.FC<SettingsComponentProps> = ({
       </div>
 
       <div className="settings-content">
-        {/* Theme Toggle */}
-        <div className="setting-item">
-          <span className={`setting-label ${isDarkMode ? 'text-white' : 'text-gray-800'}`}>
-            Dark Mode
-          </span>
-          <button
-            onClick={onThemeToggle}
-            className={`theme-toggle-button ${
-              isDarkMode 
-                ? 'theme-toggle-button-dark' 
-                : 'theme-toggle-button-light'
-            }`}
-          >
-            {isDarkMode ? <Sun size={18} /> : <Moon size={18} />}
-            {isDarkMode ? 'Light' : 'Dark'}
-          </button>
-        </div>
-
         {/* Gradient Colors */}
         <div className={`gradient-settings ${
           isDarkMode ? 'gradient-settings-dark' : 'gradient-settings-light'

frontend/src/components/ShareComponent.tsx

@@ -1,5 +1,6 @@
 import React, { useState, useEffect } from "react";
 import { Trash2 } from "lucide-react";
+import { apiCall } from "../api/apiClient";
 
 interface ShareInfo {
   id: string;
@@ -20,28 +21,6 @@ export const SharesComponent: React.FC<SharesComponentProps> = ({ isDarkMode })
   const [error, setError] = useState<string | null>(null);
   const [success, setSuccess] = useState<string | null>(null);
 
-  const getAuthToken = () => {
-    return localStorage.getItem('litecloud_token') || '';
-  };
-
-  const apiCall = async (url: string, options: RequestInit = {}) => {
-    const token = getAuthToken();
-    const response = await fetch(url, {
-      ...options,
-      headers: {
-        'Authorization': `Bearer ${token}`,
-        'Content-Type': 'application/json',
-        ...options.headers,
-      },
-    });
-    
-    if (!response.ok) {
-      throw new Error(`HTTP error! status: ${response.status}`);
-    }
-    
-    return response;
-  };
-
   const fetchShares = async () => {
     try {
       setLoading(true);
@@ -76,7 +55,30 @@ export const SharesComponent: React.FC<SharesComponentProps> = ({ isDarkMode })
     }
   };
 
-  const formatDate = (dateString: string) => {
+  const handleDownload = async (share: ShareInfo) => {
+    try {
+      setLoading(true);
+      setError(null);
+      const response = await fetch(`/api/shared/${share.id}`);
+      if (!response.ok) throw new Error('Download failed');
+      const blob = await response.blob();
+      const url = window.URL.createObjectURL(blob);
+      const a = document.createElement('a');
+      a.href = url;
+      a.download = share.file_name;
+      document.body.appendChild(a);
+      a.click();
+      a.remove();
+      window.URL.revokeObjectURL(url);
+    } catch (err) {
+      setError('Failed to download file');
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  const formatDate = (dateString: string | null) => {
+    if (!dateString) return '-';
     return new Date(dateString).toLocaleString();
   };
 
@@ -107,9 +109,7 @@ export const SharesComponent: React.FC<SharesComponentProps> = ({ isDarkMode })
       )}
 
       <div className="component-header">
-        <h1 className={`component-title ${isDarkMode ? 'text-white' : 'text-gray-800'}`}>
-          Shared Files
-        </h1>
+        <h1 className={`component-title ${isDarkMode ? 'text-white' : 'text-gray-800'}`}>Shared Files</h1>
       </div>
 
       {loading && (
@@ -118,49 +118,54 @@ export const SharesComponent: React.FC<SharesComponentProps> = ({ isDarkMode })
         </div>
       )}
 
-      <div className="shares-grid">
-        {shares.map((share) => (
-          <div key={share.id} className={`share-card ${
-            isDarkMode ? 'share-card-dark' : 'share-card-light'
-          }`}>
-            <div className="share-card-content">
-              <div className="share-info">
-                <h3 className={`share-title ${isDarkMode ? 'text-white' : 'text-gray-900'}`}>
-                  {share.file_name}
-                </h3>
-                <p className={`share-detail ${isDarkMode ? 'text-gray-400' : 'text-gray-500'}`}>
-                  Created: {formatDate(share.created_at)}
-                </p>
-                {share.expires_at && (
-                  <p className={`share-detail ${
-                    share.is_expired ? 'text-red-500' : isDarkMode ? 'text-gray-400' : 'text-gray-500'
-                  }`}>
-                    {share.is_expired ? 'Expired' : 'Expires'}: {formatDate(share.expires_at)}
-                  </p>
-                )}
-                <button
-                  onClick={() => copyToClipboard(share.id)}
-                  className={`share-link ${isDarkMode ? 'share-link-dark' : 'share-link-light'}`}
-                  title="Click to copy link"
+      <div className={`table-container ${isDarkMode ? 'table-container-dark' : 'table-container-light'}`}> 
+        <table className="data-table full-width-table">
+          <thead className={isDarkMode ? 'table-header-dark' : 'table-header-light'}>
+            <tr>
+              <th className="table-header-cell">Name</th>
+              <th className="table-header-cell">Created</th>
+              <th className="table-header-cell">Expires</th>
+              <th className="table-header-cell">Link</th>
+              <th className="table-header-cell actions-header-cell"></th>
+            </tr>
+          </thead>
+          <tbody className={`table-body ${isDarkMode ? 'table-body-dark' : 'table-body-light'}`}> 
+            {shares.map((share) => (
+              <tr key={share.id} className={isDarkMode ? 'table-row-dark' : 'table-row-light'}>
+                <td
+                  className={`table-cell ${isDarkMode ? 'text-white' : 'text-gray-900'}`}
+                  style={{ cursor: share.is_expired ? 'not-allowed' : 'pointer', textDecoration: 'underline' }}
+                  onClick={() => !share.is_expired && handleDownload(share)}
+                  title={share.is_expired ? 'Expired' : 'Download shared file'}
                 >
-                  /shared/{share.id.substring(0, 8)}...
-                </button>
-              </div>
-              <button
-                onClick={() => handleDeleteShare(share.id)}
-                className="delete-share-button"
-                title="Delete share"
-              >
-                <Trash2 size={16} />
-              </button>
-            </div>
-          </div>
-        ))}
-        
+                  {share.file_name}
+                </td>
+                <td className={`table-cell ${isDarkMode ? 'text-gray-300' : 'text-gray-500'}`}>{formatDate(share.created_at)}</td>
+                <td className={`table-cell ${share.is_expired ? 'text-red-500' : isDarkMode ? 'text-gray-300' : 'text-gray-500'}`}>{share.expires_at ? (share.is_expired ? 'Expired' : formatDate(share.expires_at)) : '-'}</td>
+                <td className={`table-cell ${isDarkMode ? 'text-gray-300' : 'text-gray-500'}`}> 
+                  <button
+                    onClick={() => copyToClipboard(share.id)}
+                    className={`share-link ${isDarkMode ? 'share-link-dark' : 'share-link-light'}`}
+                    title="Copy share link"
+                  >
+                    /api/shared/{share.id.substring(0, 8)}...
+                  </button>
+                </td>
+                <td className="table-cell actions-cell">
+                  <button
+                    onClick={() => handleDeleteShare(share.id)}
+                    className="dropdown-item dropdown-item-danger"
+                    title="Delete share"
+                  >
+                    <Trash2 size={16} />
+                  </button>
+                </td>
+              </tr>
+            ))}
+          </tbody>
+        </table>
         {shares.length === 0 && !loading && (
-          <div className={`empty-state ${isDarkMode ? 'text-gray-400' : 'text-gray-500'}`}>
-            No shared files yet
-          </div>
+          <div className={`empty-state ${isDarkMode ? 'text-gray-400' : 'text-gray-500'}`}>No shared files yet</div>
         )}
       </div>
     </div>

frontend/src/components/preview/FilePreviewer.tsx

@@ -0,0 +1,36 @@
+import React from "react";
+import ImagePreview from "./ImagePreview";
+import MarkdownPreview from "./MarkdownPreview";
+import PdfPreview from "./PdfPreview";
+import TxtPreview from "./TxtPreview";
+
+export interface FilePreviewerProps {
+  fileUrl: string;
+  fileName: string;
+  fullscreen?: boolean;
+}
+
+const getExtension = (fileName: string) => {
+  const parts = fileName.split(".");
+  return parts.length > 1 ? parts.pop()!.toLowerCase() : "";
+};
+
+const FilePreviewer: React.FC<FilePreviewerProps> = ({ fileUrl, fileName, fullscreen }) => {
+  const ext = getExtension(fileName);
+
+  if (["png", "jpg", "jpeg", "gif"].includes(ext)) {
+    return <ImagePreview fileUrl={fileUrl} fileName={fileName} fullscreen={fullscreen} />;
+  }
+  if (ext === "md") {
+    return <MarkdownPreview fileUrl={fileUrl} />;
+  }
+  if (ext === "pdf") {
+    return <PdfPreview fileUrl={fileUrl} />;
+  }
+  if (ext === "txt") {
+    return <TxtPreview fileUrl={fileUrl} />;
+  }
+  return <div>Anteprima non disponibile per questo tipo di file.</div>;
+};
+
+export default FilePreviewer;

frontend/src/components/preview/ImagePreview.tsx

@@ -0,0 +1,60 @@
+import React, { useState } from "react";
+import Cropper from "react-easy-crop";
+
+interface ImagePreviewProps {
+  fileUrl: string;
+  fileName: string;
+  fullscreen?: boolean;
+}
+
+const ImagePreview: React.FC<ImagePreviewProps> = ({ fileUrl, fileName, fullscreen }) => {
+  const [rotation, setRotation] = useState(0);
+  const [zoom, setZoom] = useState(1);
+  const [crop, setCrop] = useState({ x: 0, y: 0 });
+  const [showCrop, setShowCrop] = useState(false);
+
+  return (
+    <div style={{ width: fullscreen ? '100vw' : 500, height: fullscreen ? '100vh' : 400, background: "#222", position: 'relative', display: 'flex', flexDirection: 'column', alignItems: 'center', justifyContent: 'center' }}>
+      <div style={{ position: "relative", width: fullscreen ? '80vw' : 400, height: fullscreen ? '80vh' : 300, background: "#222", margin: '0 auto' }}>
+        {showCrop ? (
+          <Cropper
+            image={fileUrl}
+            crop={crop}
+            zoom={zoom}
+            rotation={rotation}
+            aspect={4 / 3}
+            onCropChange={setCrop}
+            onZoomChange={setZoom}
+            onRotationChange={setRotation}
+          />
+        ) : (
+          <img
+            src={fileUrl}
+            alt={fileName}
+            style={{
+              maxWidth: '100%',
+              maxHeight: '100%',
+              transform: `rotate(${rotation}deg) scale(${zoom})`,
+              display: 'block',
+              margin: '0 auto',
+              background: '#222',
+            }}
+            draggable={false}
+          />
+        )}
+      </div>
+      <div style={{ marginTop: 16, display: "flex", gap: 10, flexWrap: 'wrap', justifyContent: 'center' }}>
+        <button onClick={() => setRotation((r) => r - 90)}>Ruota -90°</button>
+        <button onClick={() => setRotation((r) => r + 90)}>Ruota +90°</button>
+        <button onClick={() => setZoom((z) => Math.max(0.1, z - 0.1))}>- Zoom</button>
+        <button onClick={() => setZoom((z) => Math.min(5, z + 0.1))}>+ Zoom</button>
+        <button onClick={() => setShowCrop((v) => !v)}>{showCrop ? 'Disabilita crop' : 'Abilita crop'}</button>
+        <a href={fileUrl} download={fileName}>
+          <button>Download</button>
+        </a>
+      </div>
+    </div>
+  );
+};
+
+export default ImagePreview;

frontend/src/components/preview/MarkdownPreview.tsx

@@ -0,0 +1,24 @@
+import React, { useEffect, useState } from "react";
+import ReactMarkdown from "react-markdown";
+
+interface MarkdownPreviewProps {
+  fileUrl: string;
+}
+
+const MarkdownPreview: React.FC<MarkdownPreviewProps> = ({ fileUrl }) => {
+  const [content, setContent] = useState("");
+
+  useEffect(() => {
+    fetch(fileUrl)
+      .then((res) => res.text())
+      .then(setContent);
+  }, [fileUrl]);
+
+  return (
+    <div style={{ maxWidth: 600, margin: "0 auto", background: "#fff", padding: 16, borderRadius: 8 }}>
+      <ReactMarkdown>{content}</ReactMarkdown>
+    </div>
+  );
+};
+
+export default MarkdownPreview;

frontend/src/components/preview/PdfPreview.tsx

@@ -0,0 +1,35 @@
+import React, { useState } from "react";
+import { Document, Page, pdfjs } from "react-pdf";
+import pdfjsWorker from 'pdfjs-dist/build/pdf.worker?url';
+
+pdfjs.GlobalWorkerOptions.workerSrc = pdfjsWorker;
+
+interface PdfPreviewProps {
+  fileUrl: string;
+}
+
+const PdfPreview: React.FC<PdfPreviewProps> = ({ fileUrl }) => {
+  const [numPages, setNumPages] = useState<number>(0);
+  const [pageNumber, setPageNumber] = useState<number>(1);
+
+  return (
+    <div style={{ textAlign: "center" }}>
+      <Document file={fileUrl} onLoadSuccess={({ numPages }) => setNumPages(numPages)}>
+        <Page pageNumber={pageNumber} />
+      </Document>
+      <div style={{ marginTop: 8 }}>
+        <button onClick={() => setPageNumber((p) => Math.max(1, p - 1))} disabled={pageNumber <= 1}>
+          Pagina precedente
+        </button>
+        <span style={{ margin: "0 8px" }}>
+          Pagina {pageNumber} di {numPages}
+        </span>
+        <button onClick={() => setPageNumber((p) => Math.min(numPages, p + 1))} disabled={pageNumber >= numPages}>
+          Pagina successiva
+        </button>
+      </div>
+    </div>
+  );
+};
+
+export default PdfPreview;

frontend/src/components/preview/TxtPreview.tsx

@@ -0,0 +1,23 @@
+import React, { useEffect, useState } from "react";
+
+interface TxtPreviewProps {
+  fileUrl: string;
+}
+
+const TxtPreview: React.FC<TxtPreviewProps> = ({ fileUrl }) => {
+  const [content, setContent] = useState("");
+
+  useEffect(() => {
+    fetch(fileUrl)
+      .then((res) => res.text())
+      .then(setContent);
+  }, [fileUrl]);
+
+  return (
+    <pre style={{ maxWidth: 600, margin: "0 auto", background: "#f5f5f5", padding: 16, borderRadius: 8, whiteSpace: "pre-wrap" }}>
+      {content}
+    </pre>
+  );
+};
+
+export default TxtPreview;