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upload.php
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<?php
// Check if user is logged in
if (!isset($_SESSION['user_id'])) {
// Store the current page as the redirect URL
$_SESSION['redirect_after_login'] = 'index.php?page=upload';
header('Location: index.php?page=login');
exit;
}
// Get user information
$user_id = $_SESSION['user_id'];
$user_query = "SELECT * FROM users WHERE id = $user_id";
$user_result = mysqli_query($conn, $user_query);
$user = mysqli_fetch_assoc($user_result);
// Get user's uploaded files
$files_query = "SELECT * FROM files WHERE user_id = $user_id ORDER BY upload_date DESC";
$files_result = mysqli_query($conn, $files_query);
// Process file upload
$success_message = '';
$error_message = '';
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_FILES['file'])) {
$file = $_FILES['file'];
// Vulnerable: No proper file validation
if ($file['error'] === UPLOAD_ERR_OK) {
$filename = $file['name'];
$tmp_name = $file['tmp_name'];
$file_type = $file['type'];
// Vulnerable: Using original filename without sanitization
$upload_dir = 'uploads/';
// Vulnerable: Not checking file extension properly
// Vulnerable: Not validating file content
// Create uploads directory if it doesn't exist
if (!file_exists($upload_dir)) {
mkdir($upload_dir, 0777, true);
}
// Vulnerable: Using predictable filename
$new_filename = time() . '_' . $filename;
$destination = $upload_dir . $new_filename;
// Vulnerable: No file type restriction
if (move_uploaded_file($tmp_name, $destination)) {
// Record file upload in database
$insert_query = "INSERT INTO files (user_id, filename, original_filename, file_type)
VALUES ($user_id, '$new_filename', '$filename', '$file_type')";
mysqli_query($conn, $insert_query);
$success_message = "File uploaded successfully!";
// Refresh files list
$files_result = mysqli_query($conn, $files_query);
} else {
$error_message = "Failed to upload file.";
}
} else {
$error_message = "Error uploading file: " . $file['error'];
}
}
// Process file deletion
if (isset($_GET['delete_file'])) {
$file_id = intval($_GET['delete_file']);
// Vulnerable: No CSRF protection
// Get file information
$file_query = "SELECT * FROM files WHERE id = $file_id AND user_id = $user_id";
$file_result = mysqli_query($conn, $file_query);
if ($file_result && mysqli_num_rows($file_result) > 0) {
$file = mysqli_fetch_assoc($file_result);
$file_path = 'uploads/' . $file['filename'];
// Delete file from filesystem
if (file_exists($file_path)) {
unlink($file_path);
}
// Delete file record from database
$delete_query = "DELETE FROM files WHERE id = $file_id AND user_id = $user_id";
mysqli_query($conn, $delete_query);
// Redirect to refresh the page
header('Location: index.php?page=upload');
exit;
}
}
?>
<div class="container-fluid">
<div class="d-flex justify-content-between flex-wrap flex-md-nowrap align-items-center pt-3 pb-2 mb-3 border-bottom">
<h1 class="h2">Upload Documents</h1>
</div>
<div class="row">
<div class="col-md-6">
<div class="card shadow mb-4">
<div class="card-header">
<h5 class="mb-0">Upload New Document</h5>
</div>
<div class="card-body">
<?php if ($success_message): ?>
<div class="alert alert-success"><?php echo $success_message; ?></div>
<?php endif; ?>
<?php if ($error_message): ?>
<div class="alert alert-danger"><?php echo $error_message; ?></div>
<?php endif; ?>
<form method="POST" action="index.php?page=upload" enctype="multipart/form-data">
<div class="mb-3">
<label for="file" class="form-label">Select File</label>
<input type="file" class="form-control" id="file" name="file" required>
<div class="form-text">
Upload documents such as receipts, statements, or identification.
</div>
</div>
<div class="mb-3">
<label for="description" class="form-label">Description (Optional)</label>
<textarea class="form-control" id="description" name="description" rows="2"></textarea>
</div>
<div class="d-grid gap-2">
<button type="submit" class="btn btn-primary">Upload Document</button>
</div>
</form>
</div>
<div class="card-footer text-muted">
<small>Supported file types: All file types are supported.</small>
</div>
</div>
<div class="card shadow">
<div class="card-header">
<h5 class="mb-0">Upload Tips</h5>
</div>
<div class="card-body">
<ul class="list-group list-group-flush">
<li class="list-group-item">
<i class="fas fa-info-circle text-primary me-2"></i>
Files are stored securely on our servers.
</li>
<li class="list-group-item">
<i class="fas fa-info-circle text-primary me-2"></i>
You can upload any type of file.
</li>
<li class="list-group-item">
<i class="fas fa-info-circle text-primary me-2"></i>
Maximum file size: 10MB.
</li>
<li class="list-group-item">
<i class="fas fa-info-circle text-primary me-2"></i>
Uploaded files can be viewed or deleted at any time.
</li>
</ul>
</div>
</div>
</div>
<div class="col-md-6">
<div class="card shadow">
<div class="card-header d-flex justify-content-between align-items-center">
<h5 class="mb-0">Your Uploaded Documents</h5>
</div>
<div class="card-body">
<?php if ($files_result && mysqli_num_rows($files_result) > 0): ?>
<div class="table-responsive">
<table class="table table-hover">
<thead>
<tr>
<th>Filename</th>
<th>Type</th>
<th>Upload Date</th>
<th>Actions</th>
</tr>
</thead>
<tbody>
<?php while ($file = mysqli_fetch_assoc($files_result)): ?>
<tr>
<td><?php echo htmlspecialchars($file['original_filename']); ?></td>
<td><?php echo htmlspecialchars($file['file_type']); ?></td>
<td><?php echo date('M d, Y', strtotime($file['upload_date'])); ?></td>
<td>
<a href="uploads/<?php echo $file['filename']; ?>" class="btn btn-sm btn-outline-primary" target="_blank">
<i class="fas fa-eye"></i>
</a>
<a href="index.php?page=upload&delete_file=<?php echo $file['id']; ?>" class="btn btn-sm btn-outline-danger"
onclick="return confirm('Are you sure you want to delete this file?');">
<i class="fas fa-trash"></i>
</a>
</td>
</tr>
<?php endwhile; ?>
</tbody>
</table>
</div>
<?php else: ?>
<div class="alert alert-info">You haven't uploaded any documents yet.</div>
<?php endif; ?>
</div>
</div>
</div>
</div>
</div>