Download Counter
Download History Viewing Program= Download and Install PHP Code =

<?php
//***************************************************************************************************
// Download Counter and Download History Viewer PHP Program
// [Everyone's Knowledge A Little Useful Book]
// [みんなの知識 ちょっと便利帳]
// https://www.benricho.org/Tips/download_history/
// Released: January 22, 2024
//
// Overview:
// This program is a system for tracking the history of file downloads, equipped with user authentication functionality.
// It includes features such as input data sanitization, log file creation, and display of download statistics.
// You are free to use it, including modifying the code and changing the page design.
//
// Note:
// Before uploading the page containing the download links, make sure to configure the "$targetFiles = array()" section of this file,
// and upload this page before the page with the download links.
// Failure to do so may result in users being unable to download when attempting, as this page sets and references the files to be downloaded.
//
// Configuration and Notes:
// ① The password is set to "admin," but please change it to any desired string.
// ② The "log" directory for storing log files is automatically generated upon the first upload.
// However, if you encounter messages such as "directory not found," please upload it separately.
// ③ Upon the initial upload, the history display shows "date" and the number "0."
// This is because log files like "count_1.log" with the upload date are simultaneously generated in the automatically created "log" directory.
// If this is a concern, access the remote server, download files like "count_1.log," delete the data, and then upload.
// ④ When displaying multiple tables on a page in history display, you can choose whether to retain the array set in [$targetFiles = array] or display them in chronological order.
// ⑤ In the history display, you can choose whether to include the domain in 1) displaying the file or 2) showing only the file name.
//
// [Format of the Link on the Page with Download Links]
// [Example] <a href="/download_history/count.php?download=Registered Number" download="DownloadedFileName.zip" target="_blank">[Any String]</a>
// ① Adjust the number in "download=1" to the number set in "$targetFiles = array()".
// ② Adjust the path to match your page.
//
// [Code (JavaScript) for displaying history in one line on the page where the download link is placed]
// [Example] <script type="text/javascript" src="/download_history/count.php?dsp_count=1&day_dsp=on"></script>
// ① Adjust the number in "dsp_count=1" to the number set in "$targetFiles = array()".
// ② If you remove "&day_dsp=on," it will display only the "total" without "today" and "yesterday".
// ③ Adjust the path to match your page.
//***************************************************************************************************

// Configuration of files to download. If there are multiple files, add them as '2', '3', '4', etc. Also, '0' is valid.
// Use "http:" or "https:" for the protocol.
$targetFiles = array(
    '1' => 'YourURL/FileName.zip',
    '2' => 'YourURL/FileName.pdf',
    '3' => 'YourURL/FileName.pdf',
    '4' => 'YourURL/FileName.pdf',
);

// Set character encoding for HTML output
header("Content-Type: text/html; charset=utf-8");

// Character encoding on the page displaying the download history
$encodingType = 'UTF-8';

// Define user authentication information and other settings
$userid = 'admin';   // User ID (replace 'admin' with any string)
$password = 'admin'; // Password (replace 'admin' with any string)
$hashedPassword = password_hash($password, PASSWORD_DEFAULT); // Use password_hash() to generate a hash value
$dataLogDir = 'log/'; // The 'log' directory is automatically generated by this program. If not created, upload a directory named 'log' separately

// Choose whether to include the domain when displaying the file name or not
$includeDomain = 1;  // 1: Display including the domain name, 0: Display only the file name

// Choose whether to replace the original array with a new one sorted in the order of the new logs when displaying multiple tables on a page
$sortTables = 1;  // 1: Sort, 0: Do not sort

$dir = 'log'; // Directory to store log files and download history

// Get the domain of your site
$domain = $_SERVER['HTTP_HOST'];

// Session management: Prevent session hijacking and use session_set_cookie_params()
session_set_cookie_params(0, '/', $domain, true, true); // Set HttpOnly and Secure flags
session_start();
if (!isset($_SESSION['auth'])) {
    $_SESSION['auth'] = FALSE;
}

// Password hashing: Use password_needs_rehash()
if (password_needs_rehash($hashedPassword, PASSWORD_DEFAULT)) {
    $newHashedPassword = password_hash($password, PASSWORD_DEFAULT);
    // Save the new hash value in a database, etc.
}

// Create the directory if it doesn't exist
if (!is_dir($dir)) {
    if (mkdir($dir, 0755, true)) {
    } else {
        // Display if directory creation fails
        echo 'Please create the "' . $dataLogDir . '" directory and upload it separately.';
    }
}

// Check if the log directory is writable
if (!is_writable($dataLogDir)) {
    die('The "' . $dataLogDir . '" directory either does not exist or does not have write permissions. Please create the directory and set the permissions properly (e.g., 755).');
}

// Get the base date and yesterday's date
$baseDay = date("Y/m/d");
$yesterday = date("Y/m/d", strtotime("-1 day"));

// Function to get the day of the week from a date
function getDayOfWeek($date)
{
    $dayOfWeek = date('w', strtotime($date));
    $weekDays = array('Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat');
    return $weekDays[$dayOfWeek];
}

// Set the file path for each target file and create a log file if it doesn't exist
foreach ($targetFiles as $key => $val) {
    $filePath[$key] = $dataLogDir . "count_" . $key . ".log";

    // Create the log file if it doesn't exist
    if (!file_exists($filePath[$key])) {
        createLogFile($filePath[$key]);
    }
}

// Get file paths and their last update dates (sorted in descending order of date)
$filePathsAndDates = array();
foreach ($filePath as $key => $path) {
    if (file_exists($path)) {
        $filePathsAndDates[$key] = filemtime($path);
    } else {
        // Output this error to the log and decide whether to continue or abort processing
        echo "Error: File does not exist - $path<br>";
    }
}

// Descending sort by the last update date (newest date comes first)
arsort($filePathsAndDates);

// Rebuild the array of sorted file paths
$sortedFilePaths = array();
foreach ($filePathsAndDates as $key => $date) {
    $sortedFilePaths[$key] = $filePath[$key];
}

// Conditionally choose whether to use the sorted paths for sorting
$filePath = ($sortTables) ? $sortedFilePaths : $filePath;

// Return JavaScript code to the client (dynamically displaying download counts)
if (isset($_GET['dsp_count'])) {
    header("Content-type: application/x-javascript");

    // Set the header as a JavaScript file
    if (!preg_match("/^[0-9]+$/", $_GET['dsp_count'])) {
        echo "document.write(\"Parameter must be a half-width number\")";
        exit();
    }

    $dspCountNo = $_GET['dsp_count'];
    if (!file_exists($filePath[$dspCountNo])) {
        createLogFile($filePath[$dspCountNo]);
    }

    $line = file($filePath[$dspCountNo]);
    $total = 0;
    $todayCount = 0;
    $yesterdayCount = 0;

    foreach ($line as $val) {
        $valArray = explode(',', $val);
        $total += trim($valArray[1]);
        if (strpos($valArray[0], $baseDay) !== false) {
            $todayCount = trim($valArray[1]);
        }
        if (strpos($valArray[0], $yesterday) !== false) {
            $yesterdayCount = trim($valArray[1]);
        }
    }

    // If the date display option is ON, display including the date
    if (isset($_GET['day_dsp']) && $_GET['day_dsp'] == 'on') {
        $countDsp = <<<EOF
document.write('<div class="counter_inpage">Total downloads: <strong>{$total}</strong>［<span class="count_today">Today : <strong>{$todayCount}</strong></span>  <span class="count_yesterday">Yesterday : <strong>{$yesterdayCount}</strong></span>］</div>')
EOF;
    } else {
        // If the date display option is OFF, display only the total download count
        $countDsp = <<<EOF
document.write('<p class="counter_inpage">Total downloads: {$total}</p>')
EOF;
    }

    // If the character encoding is not UTF-8, convert
    if ($encodingType != 'UTF-8') $countDsp = mb_convert_encoding($countDsp, "$encodingType", 'UTF-8');
    echo $countDsp;

    exit();
}

// Processing when a file download is requested
if (isset($_GET['download'])) {
    $fileId = $_GET['download'];

    // Exit if the file ID is not a number or if the file ID does not exist
    if (!preg_match("/^[0-9]+$/", $fileId) || !isset($filePath[$fileId])) {
        exit('Incorrect numeric parameter');
    }

    // Open the file and lock it
    $fp = fopen($filePath[$fileId], "rb+");
    if (!$fp) {
        exit('Failed to open the file');
    }

    flock($fp, LOCK_EX);

    // Read the log file and store it in an array
    $line = array();
    while (($data = fgets($fp)) !== false) {
        $line[] = $data;
    }

    // Truncate the file and add a new date line at the beginning
    ftruncate($fp, 0);
    rewind($fp);

    // Add a new date line at the beginning if it doesn't exist
    if (strpos($line[0], $baseDay) === false) {
        $writeLine = $baseDay . ',1' . "\n";
        fwrite($fp, $writeLine);
    }

    // Process each line in the file
    foreach ($line as $val) {
        // Increment the download count for the current date
        if (strpos($val, $baseDay) !== false) {
            $valArray = explode(',', $val);
            $valArray[1] = rtrim($valArray[1], "\n") + 1;
            $val = $valArray[0] . ',' . $valArray[1] . "\n";
        }
        fwrite($fp, $val);
    }

    // Flush the buffer and release the lock
    fflush($fp);
    flock($fp, LOCK_UN);

    // Close the file
    fclose($fp);

    // Clear the output buffer
    ob_end_clean();

    // Perform the file download
    header("Location: {$targetFiles[$fileId]}");
    exit();
} else {
    // Start the session, destroy the session if logout is requested
    session_start();
    if (isset($_GET['logout'])) {
        $_SESSION = array();
        session_destroy();
    }

    $loginError = '';

    if (!isset($_SESSION['auth'])) {
        $_SESSION['auth'] = FALSE;
    }

    // Use the password hash function to generate a hash value
    // Login processing
    if (isset($_POST['userid']) && isset($_POST['password'])) {
        // Compare hash values for authentication
        if ($_POST['userid'] === $userid && password_verify($_POST['password'], $hashedPassword)) {
            $oldSid = session_id();
            session_regenerate_id(TRUE);

            if (version_compare(PHP_VERSION, '5.1.0', '<')) {
                $path = session_save_path() != '' ? session_save_path() : '/tmp';
                $oldSessionFile = $path . '/sess_' . $oldSid;

                if (file_exists($oldSessionFile)) {
                    unlink($oldSessionFile);
                }
            }

            $_SESSION['auth'] = TRUE;
        } else {
            // Processing for authentication failure
            $_SESSION['auth'] = FALSE;
            $loginError = '<div style="text-align: center; color: crimson;">Incorrect user ID or password.</div>';
        }
    }

  // If authentication is not successful, display the login screen
    if ($_SESSION['auth'] !== TRUE) {
        ?>
        <!DOCTYPE html>
        <html lang="en">
        <head>
            <meta charset="utf-8">
            <meta name="robots" content="NOINDEX,NOFOLLOW">
            <title>Download History Login Screen</title>
            <!-- Login screen styles (modifiable as needed)-->
            <style>
                body {
                    font-family: Arial, sans-serif;
                    background-color: #f4f4f4;
                    margin: 0px;
                    padding: 0px;
                    display: flex;
                    align-items: center;
                    justify-content: center;
                    height: 100vh;
                }
                form {
                    background-color: #fff;
                    padding: 20px;
                    border-radius: 8px;
                    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);
                }
                label {
                    display: block;
                    margin-bottom: 8px;
                }
                input {
                    font-size: 18px; 
                    width: 100%;
                    padding: 8px;
                    margin-bottom: 16px;
                    box-sizing: border-box;
                }
                button {
                    font-size: 16px;
                    background-color: #4caf50;
                    color: #fff;
                    padding: 10px;
                    border: none;
                    border-radius: 4px;
                    cursor: pointer;
                }
                .logintitle {
                    text-align: center;
                    font-size: 18px;
                    font-weight: bold;
                }
                .logininfo {
                    text-align: center;
                }
                .passwordshow {
                    font-size: 14px;
                    font-weight: bold;
                    color: darkgray;
                    text-align: center;
                }
                .center-container {
                    display: inline-block;
                    margin: 0 5px 0 0;
                }
            </style>
        </head>
        <body>
            <div id="login_form">
                <form action="<?php echo $fileName; ?>?mode=download" method="post">
                    <p class="logintitle">【View Download History】</p>
                    <?php if (isset($loginError)): ?>
                        <!-- Display an error message if the $loginError variable is set -->
                        <p style="color: crimson;"><?php echo $loginError; ?></p>
                    <?php endif; ?>
                    <label for="userid">User ID:</label>
                    <input type="text" id="userid" name="userid" required>
                    <label for="password">Password:</label>
                    <input type="password" id="password" name="password" required>
                    <?php
                        // Assuming $showPassword is a PHP variable determining whether to initially show the password
                        echo '<label class="passwordshow" for="showPassword">[Show Password]<div class="center-container"><input type="checkbox" id="showPassword" onchange="togglePasswordVisibility()" ' . ($showPassword ? 'checked' : '') . '></div></label>';
                    ?>
                    <button type="submit" name="login_submit">Login</button>
                </form>   
            </div>

<!-- Control the visibility of the password -->
<script>
  function togglePasswordVisibility() {
    var passwordInput = document.getElementById('password');
    var showPasswordCheckbox = document.getElementById('showPassword');

    if (showPasswordCheckbox.checked) {
      // If checked, the password will be displayed
      passwordInput.type = 'text';
    } else {
      // Uncheck to hide password
      passwordInput.type = 'password';
    }
  }
</script>
</body>
</html><?php
exit();
} else {
  // If logged in, display the download history page
  ?>
  <!DOCTYPE html>
  <html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="robots" content="NOINDEX,NOFOLLOW">
    <title>Download History</title>
    <!-- Download history viewing style (modifiable as needed) -->
    <style>
                 body {
                     font-family: 'Hiragino Kaku Gothic ProN', 'Hiragino Kaku Gothic ProN W3', Meiryo, Osaka, 'MS PGothic', arial, helvetica, sans-serif;
                 }
                 .log_title {
                     font-size: 16px;
                     font-weight: bold;
                     color: brown;
                     margin: 0px 0px 15px 10px;
                 }
                 .get_url {
                     font-size: 13px;
                     font-weight: bold;
                     padding: 8px 0;
                     color: brown;
                     background-color: lightgoldenrodyellow;
                 }
                 .log_table{
                     float:left;
                     width: 300px;
                     border: #CCC 1px solid;
                     border-radius: 5px;
                     margin: 0px 0px 5px 10px;
                     padding: 0px 5px 5px 5px;
                     word-break: break-all;
                 }
                 table {
                     width: 100%;
                     border-collapse: collapse;
                 }
                 td,
                 th {
                     padding: 5px 10px;
                     border: 1px solid #999;
                     text-align: right;
                     font-size: 90%;
                 }
                 th {
                     background: lavenderblush;
                     text-align: center;
                     font-weight: normal;
                 }
                 .tableheader {
                     background: lavender;
                     text-align: center;
                     font-weight: bold;
                     white-space: nowrap;
                 }
                 .total{
                     float:left;
                     margin: -25px 0px 0px 10px;
                 }
                 .counter_inpage{
                     margin: 15px 0px 8px 0px;
                 }
                 .bold{
                     font-weight: bold;
                 }
             </style>
  </head>
  <body>
    <div class="log_title">【Download History】 【<a href="?logout=true">Logout</a>】</div> 
    <?php foreach($filePath as $key => $val){ ?>                      
      <div class="log_table">         
        <div class="get_url"><?php echo $includeDomain ? $targetFiles[$key] : basename($targetFiles[$key]); ?></div>
        <table align="center">
          <tr>
            <th class="tableheader">Date</th>
            <th class="tableheader">Downloads</th>
          </tr>
          <?php	  
            $totalDownload = 0;

            // Read only if the file exists
            if (file_exists($val)) {
              $line = file($val);
              foreach ($line as $lineVal) {
                $lineArray = explode(',', $lineVal);

                // Check if $lineArray[1] is a numeric value
                $numericValue = filter_var($lineArray[1], FILTER_VALIDATE_FLOAT);
                if ($numericValue !== false) {
                  $totalDownload += $numericValue;
                  ?>
                  <tr>
                    <th nowrap><?php echo $lineArray[0] . ' (' . getDayOfWeek($lineArray[0]) . ')'; ?></th>
                    <td class="bold" nowrap><?php echo $lineArray[1]; ?></td>
                  </tr>
                  <?php
                }
              }
            }
          ?>
          <tr>
            <th colspan="2" class="bold">Total Downloads: <?php echo $totalDownload;?></th>
          </tr>
        </table>
      </div>              
    <?php
                }
              }
            }
          ?>
</body>
</html><?php
// Function to sanitize all elements in an array
function sanitize($arr)
{
  // If it's an array, apply sanitization recursively
  if (is_array($arr)) {
    return array_map('sanitize', $arr);
  }
  // Remove NULL characters from within strings
  return str_replace("\0", "", $arr);
}

// Create a new log file if it doesn't exist
function createLogFile($filePath)
{
  $baseDay = date("Y/m/d");
  $fp = fopen($filePath, "a+b");

  if ($fp) {
    flock($fp, LOCK_EX);
    ftruncate($fp, 0);
    rewind($fp);
    fwrite($fp, "$baseDay,0");
    fflush($fp);
    flock($fp, LOCK_UN);
    fclose($fp);

    // Set file permissions
    chmod($filePath, 0666);
  } else {
  }
}