X-Git-Url: https://git.p6c8.net/jirafeau_project.git/blobdiff_plain/cbef2b93dfeb51484956c960d58af8c4557c25f5..93d87c13b5169a0a61e3906af13cf07ec8ae2a58:/lib/functions.php?ds=sidebyside

diff --git a/lib/functions.php b/lib/functions.php
index 48bdefd..b6672fb 100644
--- a/lib/functions.php
+++ b/lib/functions.php
@@ -2,7 +2,8 @@
 /*
  *  Jirafeau, your web file repository
  *  Copyright (C) 2008  Julien "axolotl" BERNARD <axolotl@magieeternelle.org>
- *  Copyright (C) 2012  Jerome Jutteau <j.jutteau@gmail.com>
+ *  Copyright (C) 2015  Jerome Jutteau <jerome@jutteau.fr>
+ *  Copyright (C) 2015  Nicola Spanti (RyDroid) <dev@nicola-spanti.info>
  *
  *  This program is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU Affero General Public License as
@@ -15,64 +16,263 @@
  *  GNU Affero General Public License for more details.
  *
  *  You should have received a copy of the GNU Affero General Public License
- *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
+/**
+ * Transform a string in a path by separating each letters by a '/'.
+ * @return path finishing with a '/'
+ */
+function s2p($s)
+{
+    $block_size = 8;
+    $p = '';
+    for ($i = 0; $i < strlen($s); $i++) {
+        $p .= $s[$i];
+        if (($i + 1) % $block_size == 0) {
+            $p .= '/';
+        }
+    }
+    if (strlen($s) % $block_size != 0) {
+        $p .= '/';
+    }
+    return $p;
+}
+
+/**
+ * Convert base 16 to base 64
+ * @returns A string based on 64 characters (0-9, a-z, A-Z, "-" and "_")
+ */
+function base_16_to_64($num)
+{
+    $m = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_';
+    $hex2bin = array('0000',  # 0
+                      '0001',  # 1
+                      '0010',  # 2
+                      '0011',  # 3
+                      '0100',  # 4
+                      '0101',  # 5
+                      '0110',  # 6
+                      '0111',  # 7
+                      '1000',  # 8
+                      '1001',  # 9
+                      '1010',  # a
+                      '1011',  # b
+                      '1100',  # c
+                      '1101',  # d
+                      '1110',  # e
+                      '1111'); # f
+    $o = '';
+    $b = '';
+    $i = 0;
+    # Convert long hex string to bin.
+    $size = strlen($num);
+    for ($i = 0; $i < $size; $i++) {
+        $b .= $hex2bin[hexdec($num[$i])];
+    }
+    # Convert long bin to base 64.
+    $size *= 4;
+    for ($i = $size - 6; $i >= 0; $i -= 6) {
+        $o = $m[bindec(substr($b, $i, 6))] . $o;
+    }
+    # Some few bits remaining ?
+    if ($i < 0 && $i > -6) {
+        $o = $m[bindec(substr($b, 0, $i + 6))] . $o;
+    }
+    return $o;
+}
+
+/**
+  * Generate a random code.
+  * @param $l code length
+  * @return  random code.
+  */
+function jirafeau_gen_random($l)
+{
+    if ($l <= 0) {
+        return 42;
+    }
+
+    $code="";
+    for ($i = 0; $i < $l; $i++) {
+        $code .= dechex(rand(0, 15));
+    }
+
+    return $code;
+}
+
+function jirafeau_gen_download_pass($length, $allowed_chars)
+{
+    if ($length <= 0) {
+        return false;
+    }
+    $pass="";
+    for ($i = 0; $i < $length; $i++) {
+        $pass .= $allowed_chars[rand(0, strlen($allowed_chars) - 1)];
+    }
+
+    return $pass;
+}
+
+function is_ssl()
+{
+    if (isset($_SERVER['HTTPS'])) {
+        if ('on' == strtolower($_SERVER['HTTPS']) ||
+             '1' == $_SERVER['HTTPS']) {
+            return true;
+        }
+    } elseif (isset($_SERVER['SERVER_PORT']) && ('443' == $_SERVER['SERVER_PORT'])) {
+        return true;
+    } elseif (isset($_SERVER['HTTP_X_FORWARDED_PROTO'])) {
+        if ($_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https') {
+            return true;
+        }
+    }
+    return false;
+}
+
+function jirafeau_human_size($octets)
+{
+    $u = array('B', 'KB', 'MB', 'GB', 'TB');
+    $o = max($octets, 0);
+    $p = min(floor(($o ? log($o) : 0) / log(1024)), count($u) - 1);
+    $o /= pow(1024, $p);
+    return round($o, 1) . $u[$p];
+}
+
+// Convert UTC timestamp to a datetime field
+function jirafeau_get_datetimefield($timestamp)
+{
+
+    $ts = date_create("@" . $timestamp);
+    $content = '<span class="datetime" data-datetime="' . date_format($ts, 'Y-m-d H:i') . '">'
+        . date_format($ts, 'Y-m-d H:i') . ' (GMT)</span>';
+    
+    return $content;
+}
+
+function jirafeau_fatal_error($errorText, $cfg = array())
+{
+    echo '<div class="error"><h2>Error</h2><p>' . $errorText . '</p></div>';
+    require(JIRAFEAU_ROOT . 'lib/template/footer.php');
+    exit;
+}
+
+function jirafeau_clean_rm_link($link)
+{
+    $p = s2p("$link");
+    if (file_exists(VAR_LINKS . $p . $link)) {
+        unlink(VAR_LINKS . $p . $link);
+    }
+    if (file_exists(VAR_LINKS . $p . $link . '_download')) {
+        unlink(VAR_LINKS . $p . $link . '_download');
+    }
+    $parse = VAR_LINKS . $p;
+    $scan = array();
+    while (file_exists($parse)
+           && ($scan = scandir($parse))
+           && count($scan) == 2 // '.' and '..' folders => empty.
+           && basename($parse) != basename(VAR_LINKS)) {
+        rmdir($parse);
+        $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
+    }
+}
+
+function jirafeau_clean_rm_file($hash)
+{
+    $p = s2p("$hash");
+    $f = VAR_FILES . $p . $hash;
+    if (file_exists($f) && is_file($f)) {
+        unlink($f);
+    }
+    if (file_exists($f . '_count') && is_file($f . '_count')) {
+        unlink($f . '_count');
+    }
+    $parse = VAR_FILES . $p;
+    $scan = array();
+    while (file_exists($parse)
+           && ($scan = scandir($parse))
+           && count($scan) == 2 // '.' and '..' folders => empty.
+           && basename($parse) != basename(VAR_FILES)) {
+        rmdir($parse);
+        $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
+    }
+}
+
 /**
  * transforms a php.ini string representing a value in an integer
  * @param $value the value from php.ini
  * @returns an integer for this value
  */
-function jirafeau_ini_to_bytes($value) {
-  $modifier = substr($value, -1);
-  $bytes = substr($value, 0, -1);
-  switch(strtoupper($modifier)) {
-  case 'P':
-    $bytes *= 1024;
-  case 'T':
-    $bytes *= 1024;
-  case 'G':
-    $bytes *= 1024;
-  case 'M':
-    $bytes *= 1024;
-  case 'K':
-    $bytes *= 1024;
-  default:
-    break;
-  }
-  return $bytes;
+function jirafeau_ini_to_bytes($value)
+{
+    $modifier = substr($value, -1);
+    $bytes = substr($value, 0, -1);
+    switch (strtoupper($modifier)) {
+        default:
+            return intval($value);
+            break;
+        case 'P':
+            $bytes *= 1024;
+            // no break
+        case 'T':
+            $bytes *= 1024;
+            // no break
+        case 'G':
+            $bytes *= 1024;
+            // no break
+        case 'M':
+            $bytes *= 1024;
+            // no break
+        case 'K':
+            $bytes *= 1024;
+    }
+    return $bytes;
 }
 
 /**
  * gets the maximum upload size according to php.ini
- * @returns the maximum upload size
+ * @returns the maximum upload size in bytes
  */
-function jirafeau_get_max_upload_size() {
-  return min(jirafeau_ini_to_bytes(ini_get('post_max_size')), jirafeau_ini_to_bytes(ini_get('upload_max_filesize')));
+function jirafeau_get_max_upload_size_bytes()
+{
+    return min(
+        jirafeau_ini_to_bytes(ini_get('post_max_size')),
+        jirafeau_ini_to_bytes(ini_get('upload_max_filesize'))
+    );
 }
 
 /**
- * detects if a given filename is present in a directory and find an alternate filename
- * @param $name the initial filename
- * @param $dir the directory to explore (finishing with a '/')
- * @returns an alternate filename, possibly the initial filename
+ * gets the maximum upload size according to php.ini
+ * @returns the maximum upload size string
  */
-function jirafeau_detect_collision($name, $dir) {
-  if(!file_exists($dir . $name)) {
-    return $name;
-  }
-
-  $dot = strpos($name, '.');
-  $dot = ($dot === false) ? strlen($name) : $dot;
-  $first = substr($name, 0, $dot);
-  $second = substr($name, $dot);
-  $i = 1;
-  do {
-    $new_name = $first . '-' . $i . $second;
-    $i++;
-  } while(file_exists($dir . $new_name));
+function jirafeau_get_max_upload_size()
+{
+    return jirafeau_human_size(jirafeau_get_max_upload_size_bytes());
+}
 
-  return $new_name;
+/**
+ * get the maximal upload size for a data chunk in async uploads
+ * @param max_upload_chunk_size_bytes
+ */
+function jirafeau_get_max_upload_chunk_size_bytes($max_upload_chunk_size_bytes = 0)
+{
+    if ($max_upload_chunk_size_bytes == 0) {
+        $size = jirafeau_get_max_upload_size_bytes();
+        // Jirafeau must choose an arbitrary number as PHP config does not give any limit nor $max_upload_chunk_size_bytes
+        if ($size == 0) {
+            return 10000000; // 10MB
+        }
+        return $size;
+    }
+    $size = min(
+        jirafeau_get_max_upload_size_bytes(),
+        $max_upload_chunk_size_bytes
+    );
+    if ($size == 0) {
+        return $max_upload_chunk_size_bytes;
+    }
+    return $size;
 }
 
 /**
@@ -80,28 +280,147 @@ function jirafeau_detect_collision($name, $dir) {
  * @param $code the error code
  * @returns a string explaining the error
  */
-function jirafeau_upload_errstr($code) {
-  switch($code) {
-  case UPLOAD_ERR_INI_SIZE:
-  case UPLOAD_ERR_FORM_SIZE:
-    return _('Your file exceeds the maximum authorized file size.');
-    break;
+function jirafeau_upload_errstr($code)
+{
+    switch ($code) {
+        case UPLOAD_ERR_INI_SIZE:
+        case UPLOAD_ERR_FORM_SIZE:
+            return t('Your file exceeds the maximum authorized file size. ');
+
+        case UPLOAD_ERR_PARTIAL:
+        case UPLOAD_ERR_NO_FILE:
+            return
+                t('Your file was not uploaded correctly. You may succeed in retrying. ');
+
+        case UPLOAD_ERR_NO_TMP_DIR:
+        case UPLOAD_ERR_CANT_WRITE:
+        case UPLOAD_ERR_EXTENSION:
+            return t('Internal error. You may not succeed in retrying. ');
+    }
+    return t('Unknown error. ');
+}
+
+/** Remove link and it's file
+ * @param $link the link's name (hash)
+ */
 
-  case UPLOAD_ERR_PARTIAL:
-  case UPLOAD_ERR_NO_FILE:
-    return _('Your file was not uploaded correctly. You may succeed in retrying.');
-    break;
+function jirafeau_delete_link($link)
+{
+    $l = jirafeau_get_link($link);
+    if (!count($l)) {
+        return;
+    }
+
+    jirafeau_clean_rm_link($link);
 
-  case UPLOAD_ERR_NO_TMP_DIR:
-  case UPLOAD_ERR_CANT_WRITE:
-  case UPLOAD_ERR_EXTENSION:
-    return _('Internal error. You may not succeed in retrying.');
-    break;
+    $hash = $l['hash'];
+    $p = s2p("$hash");
 
-  default:
-    break;
-  }
-  return _('Unknown error.');
+    $counter = 1;
+    if (file_exists(VAR_FILES . $p . $hash. '_count')) {
+        $content = file(VAR_FILES . $p . $hash. '_count');
+        $counter = trim($content[0]);
+    }
+    $counter--;
+
+    if ($counter >= 1) {
+        $handle = fopen(VAR_FILES . $p . $hash. '_count', 'w');
+        fwrite($handle, $counter);
+        fclose($handle);
+    }
+
+    if ($counter == 0) {
+        jirafeau_clean_rm_file($hash);
+    }
+}
+
+/**
+ * Delete a file and it's links.
+ */
+function jirafeau_delete_file($hash)
+{
+    $count = 0;
+    /* Get all links files. */
+    $stack = array(VAR_LINKS);
+    while (($d = array_shift($stack)) && $d != null) {
+        $dir = scandir($d);
+
+        foreach ($dir as $node) {
+            if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
+                preg_match('/\.tmp/i', "$node")) {
+                continue;
+            }
+
+            if (is_dir($d . $node)) {
+                /* Push new found directory. */
+                $stack[] = $d . $node . '/';
+            } elseif (is_file($d . $node)) {
+                /* Read link informations. */
+                $l = jirafeau_get_link(basename($node));
+                if (!count($l)) {
+                    continue;
+                }
+                if ($l['hash'] == $hash) {
+                    $count++;
+                    jirafeau_delete_link($node);
+                }
+            }
+        }
+    }
+    jirafeau_clean_rm_file($hash);
+    return $count;
+}
+
+
+/** hash file's content
+ * @param $method hash method, see 'file_hash' option. Valid methods are 'md5', 'md5_outside' or 'random'
+ * @param $file_path file to hash
+ * @returns hash string
+ */
+function jirafeau_hash_file($method, $file_path)
+{
+    switch ($method) {
+        case 'md5_outside':
+            return jirafeau_md5_outside($file_path);
+        case 'md5':
+            return md5_file($file_path);
+        case 'random':
+            return jirafeau_gen_random(32);
+    }
+    return md5_file($file_path);
+}
+
+/** hash part of file: start, end and size.
+ * This is a partial file hash, faster but weaker.
+ * @param $file_path file to hash
+ * @returns hash string
+ */
+function jirafeau_md5_outside($file_path)
+{
+    $out = false;
+    $handle = fopen($file_path, "r");
+    if ($handle === false) {
+        return false;
+    }
+    $size = filesize($file_path);
+    if ($size === false) {
+        goto err;
+    }
+    $first = fread($handle, 64);
+    if ($first === false) {
+        goto err;
+    }
+    if (fseek($handle, $size < 64 ? 0 : $size - 64) == -1) {
+        goto err;
+    }
+    $last = fread($handle, 64);
+    if ($last === false) {
+        goto err;
+    }
+    $out = md5($first . $last . $size);
+    err:
+    fclose($handle);
+    return $out;
 }
 
 /**
@@ -110,127 +429,178 @@ function jirafeau_upload_errstr($code) {
  * @param $one_time_download is the file a one time download ?
  * @param $key if not empty, protect the file with this key
  * @param $time the time of validity of the file
- * @param $cfg the current configuration
  * @param $ip uploader's ip
+ * @param $crypt boolean asking to crypt or not
+ * @param $link_name_length size of the link name
  * @returns an array containing some information
  *   'error' => information on possible errors
  *   'link' => the link name of the uploaded file
+ *   'delete_link' => the link code to delete file
  */
-function jirafeau_upload($file, $one_time_download, $key, $time, $cfg, $ip) {
-  if(empty($file['tmp_name']) || !is_uploaded_file($file['tmp_name'])) {
-    return(array('error' => array('has_error' => true, 'why' => jirafeau_upload_errstr($file['error'])), 'link' => ''));
-  }
-
-  /* array representing no error */
-  $noerr = array('has_error' => false, 'why' => '');
-
-  /* file informations */
-  $md5 = md5_file($file['tmp_name']);
-  $name = trim($file['name']);
-  $mime_type = $file['type'];
-  $size = $file['size'];
-
-  /* does file already exist ? */
-  $rc = false;
-  if(file_exists(VAR_FILES . $md5)) {
-    $rc = unlink($file['tmp_name']);
-  }
-  elseif(move_uploaded_file($file['tmp_name'], VAR_FILES . $md5)) {
-    $rc = true;
-  }
-  if(!$rc)
-  {
-    return(array(
-      'error' => array(
-        'has_error' => true,
-        'why' => _('Internal error during file creation.')),
-      'link' => '')
-    );
-  }
-
-  /* increment or create count file */
-  $counter=0;
-  if(file_exists(VAR_FILES . $md5 . '_count')) {
-    $content = file(VAR_FILES . $md5 . '_count');
-    $counter = trim($content[0]);
-  }
-  $counter++;
-  $handle = fopen(VAR_FILES . $md5 . '_count', 'w');
-  fwrite($handle, $counter);
-  fclose($handle);
-
-  /* create link file */
-  $link_tmp_name = VAR_LINKS . $md5 . rand(0, 10000) . '.tmp';
-  $handle = fopen($link_tmp_name, 'w');
-  fwrite($handle, $name . NL . $mime_type . NL . $size . NL . $key . NL . $time . NL . $md5 . NL . ($one_time_download ? 'O' : 'R') . NL . date('U') . NL . $ip . NL);
-  fclose($handle);
-  $md5_link = md5_file($link_tmp_name);
-  if(!rename($link_tmp_name, VAR_LINKS . $md5_link)) {
-    if ($counter > 1) {
-      $counter--;
-      $handle = fopen(VAR_FILES . $md5 . '_count', 'w');
-      fwrite($handle, $counter);
-      fclose($handle);
-    }
-    else {
-      unlink($link_tmp_name);
-      unlink(VAR_FILE . $md5 . '_count');
-      unlink(VAR_FILE . $md5);
-    }
-    return(array(
-      'error' => array(
-        'has_error' => true,
-        'why' => _('Internal error during file creation.')),
-      'link' => '')
+function jirafeau_upload($file, $one_time_download, $key, $time, $ip, $crypt, $link_name_length, $file_hash_method)
+{
+    if (empty($file['tmp_name']) || !is_uploaded_file($file['tmp_name'])) {
+        return (array(
+                 'error' =>
+                   array('has_error' => true,
+                          'why' => jirafeau_upload_errstr($file['error'])),
+                 'link' => '',
+                 'delete_link' => ''));
+    }
+
+    /* array representing no error */
+    $noerr = array('has_error' => false, 'why' => '');
+
+    /* Crypt file if option is enabled. */
+    $crypted = false;
+    $crypt_key = '';
+    if ($crypt == true && !(extension_loaded('sodium') == true)) {
+        error_log("PHP extension sodium not loaded, won't encrypt in Jirafeau");
+    }
+    if ($crypt == true && extension_loaded('sodium') == true) {
+        $crypt_key = jirafeau_encrypt_file($file['tmp_name'], $file['tmp_name'].'crypt');
+        if (strlen($crypt_key) > 0) {
+            if (rename($file['tmp_name'].'crypt', $file['tmp_name']) === true) {
+                $crypted = true;
+            }
+        }
+    }
+
+    /* file information */
+    $hash = jirafeau_hash_file($file_hash_method, $file['tmp_name']);
+    $name = str_replace(NL, '', trim($file['name']));
+    $mime_type = $file['type'];
+    $size = $file['size'];
+
+    /* does file already exist ? */
+    $rc = false;
+    $p = s2p("$hash");
+    if (file_exists(VAR_FILES . $p .  $hash)) {
+        $rc = unlink($file['tmp_name']);
+    } elseif ((file_exists(VAR_FILES . $p) || @mkdir(VAR_FILES . $p, 0755, true))
+            && move_uploaded_file($file['tmp_name'], VAR_FILES . $p . $hash)) {
+        $rc = true;
+    }
+    if (!$rc) {
+        return (array(
+                 'error' =>
+                   array('has_error' => true,
+                          'why' => t('INTERNAL_ERROR_DEL')),
+                 'link' =>'',
+                 'delete_link' => ''));
+    }
+
+    /* Increment or create count file. */
+    $counter = 0;
+    if (file_exists(VAR_FILES . $p . $hash . '_count')) {
+        $content = file(VAR_FILES . $p . $hash. '_count');
+        $counter = trim($content[0]);
+    }
+    $counter++;
+    $handle = fopen(VAR_FILES . $p . $hash. '_count', 'w');
+    fwrite($handle, $counter);
+    fclose($handle);
+
+    /* Create delete code. */
+    $delete_link_code = jirafeau_gen_random(5);
+
+    /* hash password or empty. */
+    $password = '';
+    if (!empty($key)) {
+        $password = md5($key);
+    }
+
+    /* create link file */
+    $link_tmp_name =  VAR_LINKS . $hash . rand(0, 10000) . '.tmp';
+    $handle = fopen($link_tmp_name, 'w');
+    fwrite(
+        $handle,
+        $name . NL. $mime_type . NL. $size . NL. $password . NL. $time .
+            NL . $hash. NL . ($one_time_download ? 'O' : 'R') . NL . time() .
+            NL . $ip . NL. $delete_link_code . NL . ($crypted ? 'C2' : 'O')
     );
-  }
-  return(array('error' => $noerr, 'link' => $md5_link));
+    fclose($handle);
+    $hash_link = substr(base_16_to_64(md5_file($link_tmp_name)), 0, $link_name_length);
+    $l = s2p("$hash_link");
+    if (!@mkdir(VAR_LINKS . $l, 0755, true) ||
+        !rename($link_tmp_name, VAR_LINKS . $l . $hash_link)) {
+        if (file_exists($link_tmp_name)) {
+            unlink($link_tmp_name);
+        }
+
+        $counter--;
+        if ($counter >= 1) {
+            $handle = fopen(VAR_FILES . $p . $hash. '_count', 'w');
+            fwrite($handle, $counter);
+            fclose($handle);
+        } else {
+            jirafeau_clean_rm_file($hash_link);
+        }
+        return array(
+                 'error' =>
+                   array('has_error' => true,
+                          'why' => t('Internal error during file creation. ')),
+                 'link' =>'',
+                 'delete_link' => '');
+    }
+    return array( 'error' => $noerr,
+                  'link' => $hash_link,
+                  'delete_link' => $delete_link_code,
+                  'crypt_key' => $crypt_key);
 }
 
 /**
- * tells if a mime-type is viewable in a browser
+ * Tells if a mime-type is viewable in a browser
  * @param $mime the mime type
  * @returns a boolean telling if a mime type is viewable
  */
-function jirafeau_is_viewable($mime) {
-  if(!empty($mime)) {
-    // actually, verify if mime-type is an image or a text
-    $viewable = array('image', 'text');
-    $decomposed = explode('/', $mime);
-    return in_array($decomposed[0], $viewable);
-  }
-  return false;
+function jirafeau_is_viewable($mime)
+{
+    if (!empty($mime)) {
+        $viewable = array('image', 'video', 'audio');
+        $decomposed = explode('/', $mime);
+        if (in_array($decomposed[0], $viewable) && strpos($mime, 'image/svg+xml') === false) {
+            return true;
+        }
+        $viewable = array('text/plain');
+        if (in_array($mime, $viewable)) {
+            return true;
+        }
+    }
+    return false;
 }
 
-
 // Error handling functions.
 //! Global array that contains all registered errors.
-$error_list = array ();
+$error_list = array();
 
 /**
  * Adds an error to the list of errors.
  * @param $title the error's title
  * @param $description is a human-friendly description of the problem.
  */
-function add_error ($title, $description) {
+function add_error($title, $description)
+{
     global $error_list;
-    $error_list[] = '<p>' . $title . '<br />' . $description . '</p>';
+    $error_list[] = '<p>' . $title. '<br />' . $description. '</p>';
 }
 
 /**
  * Informs whether any error has been registered yet.
  * @return true if there are errors.
  */
-function has_error () {
+function has_error()
+{
     global $error_list;
-    return !empty ($error_list);
+    return !empty($error_list);
 }
 
 /**
  * Displays all the errors.
  */
-function show_errors () {
-    if (has_error ()) {
+function show_errors()
+{
+    if (has_error()) {
         global $error_list;
         echo '<div class="error">';
         foreach ($error_list as $error) {
@@ -240,4 +610,1113 @@ function show_errors () {
     }
 }
 
-?>
+function check_errors($cfg)
+{
+    if (!($cfg['installation_done'] === true)) {
+        if (file_exists(JIRAFEAU_ROOT . 'install.php')) {
+            header('Location: install.php');
+            exit;
+        } else {
+            add_error(t('INSTALL_FILE_NOT_FOUND_TITLE'), t('INSTALL_FILE_NOT_FOUND_DESC'));
+        }
+    }
+
+    if (!is_writable(VAR_FILES)) {
+        add_error(t('FILE_DIR_W'), VAR_FILES);
+    }
+
+    if (!is_writable(VAR_LINKS)) {
+        add_error(t('LINK_DIR_W'), VAR_LINKS);
+    }
+
+    if (!is_writable(VAR_ASYNC)) {
+        add_error(t('ASYNC_DIR_W'), VAR_ASYNC);
+    }
+
+    if ($cfg['enable_crypt'] && $cfg['litespeed_workaround']) {
+        add_error(t('INCOMPATIBLE_OPTIONS_W'), 'enable_crypt=true<br>litespeed_workaround=true');
+    }
+
+    if ($cfg['one_time_download'] && $cfg['litespeed_workaround']) {
+        add_error(t('INCOMPATIBLE_OPTIONS_W'), 'one_time_download=true<br>litespeed_workaround=true');
+    }
+}
+
+/**
+ * Read link information
+ * @return array containing information.
+ */
+function jirafeau_get_link($hash)
+{
+    $out = array();
+    $link = VAR_LINKS . s2p("$hash") . $hash;
+
+    if (!file_exists($link)) {
+        return $out;
+    }
+
+    $c = file($link);
+    $out['file_name'] = trim($c[0]);
+    $out['mime_type'] = trim($c[1]);
+    $out['file_size'] = trim($c[2]);
+    $out['key'] = trim($c[3], NL);
+    $out['time'] = trim($c[4]);
+    $out['hash'] = trim($c[5]);
+    $out['onetime'] = trim($c[6]);
+    $out['upload_date'] = trim($c[7]);
+    $out['ip'] = trim($c[8]);
+    $out['link_code'] = trim($c[9]);
+    $out['crypted'] = trim($c[10]) == 'C2';
+    $out['crypted_legacy'] = trim($c[10]) == 'C';
+
+    return $out;
+}
+
+/**
+ * List files in admin interface.
+ */
+function jirafeau_admin_list($name, $file_hash, $link_hash)
+{
+    echo '<fieldset><legend>';
+    if (!empty($name)) {
+        echo t('FILENAME') . ": " . jirafeau_escape($name);
+    }
+    if (!empty($file_hash)) {
+        echo t('FILE') . ": " . jirafeau_escape($file_hash);
+    }
+    if (!empty($link_hash)) {
+        echo t('LINK') . ": " . jirafeau_escape($link_hash);
+    }
+    if (empty($name) && empty($file_hash) && empty($link_hash)) {
+        echo t('LS_FILES');
+    }
+    echo '</legend>';
+    echo '<table>';
+    echo '<tr>';
+    echo '<th></th>';
+    echo '<th>' . t('ACTION') . '</th>';
+    echo '</tr>';
+
+    /* Get all links files. */
+    $stack = array(VAR_LINKS);
+    while (($d = array_shift($stack)) && $d != null) {
+        $dir = scandir($d);
+        foreach ($dir as $node) {
+            if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
+                preg_match('/\.tmp/i', "$node")) {
+                continue;
+            }
+            if (is_dir($d . $node)) {
+                /* Push new found directory. */
+                $stack[] = $d . $node . '/';
+            } elseif (is_file($d . $node)) {
+                /* Read link information. */
+                $l = jirafeau_get_link($node);
+                if (!count($l)) {
+                    continue;
+                }
+                $ld = jirafeau_get_download_stats($node);
+
+                /* Filter. */
+                if (!empty($name) && !@preg_match("/$name/i", jirafeau_escape($l['file_name']))) {
+                    continue;
+                }
+                if (!empty($file_hash) && $file_hash != $l['hash']) {
+                    continue;
+                }
+                if (!empty($link_hash) && $link_hash != $node) {
+                    continue;
+                }
+                /* Print link information. */
+                echo '<tr>';
+                echo '<td>' .
+                '<strong><a id="upload_link" href="f.php?h='. jirafeau_escape($node) .'" title="' .
+                    t('DL_PAGE') . '">' . jirafeau_escape($l['file_name']) . '</a></strong><br/>';
+                echo t('TYPE') . ': ' . jirafeau_escape($l['mime_type']) . '<br/>';
+                echo t('SIZE') . ': ' . jirafeau_human_size($l['file_size']) . '<br>';
+                echo t('EXPIRE') . ': ' . ($l['time'] == -1 ? '∞' : jirafeau_get_datetimefield($l['time'])) . '<br/>';
+                echo t('ONETIME') . ': ' . ($l['onetime'] == 'O' ? 'Yes' : 'No') . '<br/>';
+                echo t('UPLOAD_DATE') . ': ' . jirafeau_get_datetimefield($l['upload_date']) . '<br/>';
+                if (strlen($l['ip']) > 0) {
+                    echo t('ORIGIN') . ': ' . $l['ip'] . '<br/>';
+                }
+                echo t('DOWNLOAD_COUNT') . ': ' . $ld['count'] . '<br/>';
+                if ($ld['count'] > 0) {
+                    echo t('DOWNLOAD_DATE') . ': ' . jirafeau_get_datetimefield($ld['date']) . '<br/>';
+                    echo t('DOWNLOAD_IP') . ': ' . $ld['ip'] . '<br/>';
+                }
+                echo '</td><td>';
+                echo '<form method="post">' .
+                '<input type = "hidden" name = "action" value = "download"/>' .
+                '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
+                jirafeau_admin_csrf_field() .
+                '<input type = "submit" value = "' . t('DL') . '" />' .
+                '</form>' .
+                '<form method="post">' .
+                '<input type = "hidden" name = "action" value = "delete_link"/>' .
+                '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
+                jirafeau_admin_csrf_field() .
+                '<input type = "submit" value = "' . t('DEL_LINK') . '" />' .
+                '</form>' .
+                '<form method="post">' .
+                '<input type = "hidden" name = "action" value = "delete_file"/>' .
+                '<input type = "hidden" name = "hash" value = "' . $l['hash'] . '"/>' .
+                jirafeau_admin_csrf_field() .
+                '<input type = "submit" value = "' . t('DEL_FILE_LINKS') . '" />' .
+                '</form>' .
+                '</td>';
+                echo '</tr>';
+            }
+        }
+    }
+    echo '</table></fieldset>';
+}
+
+/**
+ * Clean expired files.
+ * @return number of cleaned files.
+ */
+function jirafeau_admin_clean()
+{
+    $count = 0;
+    /* Get all links files. */
+    $stack = array(VAR_LINKS);
+    while (($d = array_shift($stack)) && $d != null) {
+        $dir = scandir($d);
+
+        foreach ($dir as $node) {
+            if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
+                preg_match('/\.tmp/i', "$node")) {
+                continue;
+            }
+
+            if (is_dir($d . $node)) {
+                /* Push new found directory. */
+                $stack[] = $d . $node . '/';
+            } elseif (is_file($d . $node)) {
+                /* Read link information. */
+                $l = jirafeau_get_link(basename($node));
+                if (!count($l)) {
+                    continue;
+                }
+                $p = s2p($l['hash']);
+                if ($l['time'] > 0 && $l['time'] < time() || // expired
+                    !file_exists(VAR_FILES . $p . $l['hash']) || // invalid
+                    !file_exists(VAR_FILES . $p . $l['hash'] . '_count')) { // invalid
+                    jirafeau_delete_link($node);
+                    $count++;
+                }
+            }
+        }
+    }
+    return $count;
+}
+
+
+/**
+ * Clean old async transfers.
+ * @return number of cleaned files.
+ */
+function jirafeau_admin_clean_async()
+{
+    $count = 0;
+    /* Get all links files. */
+    $stack = array(VAR_ASYNC);
+    while (($d = array_shift($stack)) && $d != null) {
+        $dir = scandir($d);
+
+        foreach ($dir as $node) {
+            if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
+                preg_match('/\.tmp/i', "$node")) {
+                continue;
+            }
+
+            if (is_dir($d . $node)) {
+                /* Push new found directory. */
+                $stack[] = $d . $node . '/';
+            } elseif (is_file($d . $node)) {
+                /* Read async information. */
+                $a = jirafeau_get_async_ref(basename($node));
+                if (!count($a)) {
+                    continue;
+                }
+                /* Delete transfers older than 1 hour. */
+                if (time() - $a['last_edited'] > 3600) {
+                    jirafeau_async_delete(basename($node));
+                    $count++;
+                }
+            }
+        }
+    }
+    return $count;
+}
+
+/**
+ * Better strval function for debug purposes
+ */
+function jirafeau_strval($value)
+{
+    if (gettype($value) == "boolean") {
+        return $value ? 'true' : 'false';
+    }
+    return strval($value);
+}
+
+/**
+ * Show file/folder permissions
+ */
+function jirafeau_fileperms($path)
+{
+    $out = substr(sprintf("%o", @fileperms($path)), -4) . ", ";
+    $out .= "read " . (is_readable($path) ? "OK" : "KO") . ", ";
+    $out .= "write " . (is_writable($path) ? "OK" : "KO");
+    return $out;
+}
+
+/**
+ * Show some useful informations for bug reporting.
+ */
+function jirafeau_admin_bug_report($cfg)
+{
+    $out = "<fieldset><legend>" . t('REPORTING_AN_ISSUE') . "</legend>";
+    $out .= "If you have a problem related to Jirafeau, please <a href='https://gitlab.com/mojo42/Jirafeau/-/issues'>open an issue</a>, explain your problem in english and copy-paste the following content:<br/><br/><code>";
+
+    $out .= "# Jirafeau<br/>";
+    $out .= "- version: " . JIRAFEAU_VERSION . "<br/>";
+    $jirafeau_options = [
+        'debug',
+        'file_hash',
+        'litespeed_workaround',
+        'store_uploader_ip',
+        'installation_done',
+        'enable_crypt',
+        'preview',
+        'maximal_upload_size',
+        'store_uploader_ip',
+        'max_upload_chunk_size_bytes'
+    ];
+    foreach ($jirafeau_options as &$o) {
+        $v = $cfg[$o];
+        $out .= "- $o: " . jirafeau_strval($v) . " (" . gettype($v) . ")<br/>";
+    }
+    $out .= "<br/>";
+
+    $out .= "# PHP options<br/>";
+    $out .= "- php version: " . phpversion() . "<br/>";
+    $out .= "- sodium version: " . phpversion('sodium') . "<br/>";
+    $out .= "- mcrypt version: " . phpversion('mcrypt') . "<br/>";
+    $php_options =  [
+        'post_max_size',
+        'upload_max_filesize',
+        'safe_mode',
+        'max_execution_time',
+        'max_input_time'
+    ];
+    foreach ($php_options as &$o) {
+        $v = ini_get($o);
+        $out .= "- $o: " . jirafeau_strval($v) . " (" . gettype($v). ")<br/>";
+    }
+    $out .= "- can set_time_limit: " . (set_time_limit(0) ? "yes" : "no") . "<br/>";
+    $out .= "<br/>";
+
+    $out .= "# File permissions<br/>";
+    $out .= "- 'var' folder permissions: " . jirafeau_fileperms($cfg['var_root']) . "<br/>";
+    $out .= "- 'file' folder permissions: " . jirafeau_fileperms(VAR_FILES) . "<br/>";
+    $out .= "- 'links' folder permissions: " . jirafeau_fileperms(VAR_LINKS) . "<br/>";
+    $out .= "- 'async' folder permissions: " . jirafeau_fileperms(VAR_ASYNC) . "<br/>";
+    $out .= "<br/>";
+
+    $out .= "# Server details<br/>";
+    $out .= "- server software: " . $_SERVER["SERVER_SOFTWARE"] . "<br/>";
+    $out .= "<br/>";
+
+    $out .= "# OS details<br/>";
+    $out .= "- OS: " . php_uname() . "<br/>";
+    $out .= "<br/>";
+
+    $out .= "# Browser details<br/>";
+    $out .= "<script type='text/javascript' lang='Javascript'>
+        // @license magnet:?xt=urn:btih:0b31508aeb0634b347b8270c7bee4d411b5d4109&dn=agpl-3.0.txt AGPL-v3-or-Later
+        document.write('- html5 support: ' + (check_html5_file_api() ? 'yes' : 'no') + '<br/>');
+        document.write('- user agent: ' + navigator.userAgent + '<br/>');
+        // @license-end
+        </script>";
+    $out .= "<br/>";
+
+    $out .= "# Memory<br/>";
+    $out .= "- memory_get_peak_usage: " . jirafeau_human_size(memory_get_peak_usage()) . "<br/>";
+
+    $out .= "</code></fieldset>";
+    return $out;
+}
+
+/**
+ * Read async transfer information
+ * @return array containing information.
+ */
+function jirafeau_get_async_ref($ref)
+{
+    $out = array();
+    $refinfos = VAR_ASYNC . s2p("$ref") . "$ref";
+
+    if (!file_exists($refinfos)) {
+        return $out;
+    }
+
+    $c = file($refinfos);
+    $out['file_name'] = trim($c[0]);
+    $out['mime_type'] = trim($c[1]);
+    $out['key'] = trim($c[2], NL);
+    $out['time'] = trim($c[3]);
+    $out['onetime'] = trim($c[4]);
+    $out['ip'] = trim($c[5]);
+    $out['last_edited'] = trim($c[6]);
+    $out['next_code'] = trim($c[7]);
+    return $out;
+}
+
+/**
+ * Delete async transfer information
+ */
+function jirafeau_async_delete($ref)
+{
+    $p = s2p("$ref");
+    if (file_exists(VAR_ASYNC . $p . $ref)) {
+        unlink(VAR_ASYNC . $p . $ref);
+    }
+    if (file_exists(VAR_ASYNC . $p . $ref . '_data')) {
+        unlink(VAR_ASYNC . $p . $ref . '_data');
+    }
+    $parse = VAR_ASYNC . $p;
+    $scan = array();
+    while (file_exists($parse)
+           && ($scan = scandir($parse))
+           && count($scan) == 2 // '.' and '..' folders => empty.
+           && basename($parse) != basename(VAR_ASYNC)) {
+        rmdir($parse);
+        $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
+    }
+}
+
+/**
+  * Init a new asynchronous upload.
+  * @param $filename Name of the file to send
+  * @param $one_time One time upload parameter
+  * @param $key eventual password (or blank)
+  * @param $time time limit
+  * @param $ip ip address of the client
+  * @return a string containing a temporary reference followed by a code or a string starting with 'Error'
+  */
+function jirafeau_async_init($filename, $type, $one_time, $key, $time, $ip)
+{
+    /* Create temporary folder. */
+    $ref;
+    $p;
+    $code = jirafeau_gen_random(4);
+    do {
+        $ref = jirafeau_gen_random(32);
+        $p = VAR_ASYNC . s2p($ref);
+    } while (file_exists($p));
+    @mkdir($p, 0755, true);
+    if (!file_exists($p)) {
+        return 'Error: cannot create async folder.';
+    }
+
+    /* touch empty data file */
+    $w_path = $p . $ref . '_data';
+    touch($w_path);
+
+    /* md5 password or empty */
+    $password = '';
+    if (!empty($key)) {
+        $password = md5($key);
+    }
+
+    /* Store information. */
+    $p .= $ref;
+    $handle = fopen($p, 'w');
+    fwrite(
+        $handle,
+        str_replace(NL, '', trim($filename)) . NL .
+            str_replace(NL, '', trim($type)) . NL . $password . NL .
+            $time . NL . ($one_time ? 'O' : 'R') . NL . $ip . NL .
+            time() . NL . $code . NL
+    );
+    fclose($handle);
+
+    return $ref . NL . $code ;
+}
+
+/**
+  * Append a piece of file on the asynchronous upload.
+  * @param $ref asynchronous upload reference
+  * @param $file piece of data
+  * @param $code client code for this operation
+  * @param $max_file_size maximum allowed file size
+  * @return a string containing a next code to use or a string starting with 'Error'
+  */
+function jirafeau_async_push($ref, $data, $code, $max_file_size)
+{
+    /* Get async infos. */
+    $a = jirafeau_get_async_ref($ref);
+
+    /* Check some errors. */
+    if (count($a) == 0) {
+        return "Error: cannot find transfer";
+    }
+    if ($a['next_code'] != "$code") {
+        return "Error: bad transfer code";
+    }
+    if ($data['error'] != UPLOAD_ERR_OK) {
+        // Check error code in https://www.php.net/manual/en/features.file-upload.errors.php
+        $data_details = print_r($data, true);
+        return "Error: upload error: {$data_details}";
+    }
+    if (empty($data['tmp_name'])) {
+        return "Error: missing tmp_name";
+    }
+    if (!is_uploaded_file($data['tmp_name'])) {
+        return "Error: tmp_name may not be uploaded";
+    }
+
+    $p = s2p($ref);
+
+    /* File path. */
+    $r_path = $data['tmp_name'];
+    $w_path = VAR_ASYNC . $p . $ref . '_data';
+
+    /* Check that file size is not above upload limit. */
+    if ($max_file_size > 0 &&
+        filesize($r_path) + filesize($w_path) > $max_file_size * 1024 * 1024) {
+        jirafeau_async_delete($ref);
+        return "Error: file size is above upload limit";
+    }
+
+    /* Concatenate data. */
+    $r = fopen($r_path, 'r');
+    $w = fopen($w_path, 'a');
+    while (!feof($r)) {
+        if (fwrite($w, fread($r, 1024)) === false) {
+            fclose($r);
+            fclose($w);
+            jirafeau_async_delete($ref);
+            return "Error: cannot write file";
+        }
+    }
+    fclose($r);
+    fclose($w);
+    unlink($r_path);
+
+    /* Update async file. */
+    $code = jirafeau_gen_random(4);
+    $handle = fopen(VAR_ASYNC . $p . $ref, 'w');
+    fwrite(
+        $handle,
+        $a['file_name'] . NL. $a['mime_type'] . NL. $a['key'] . NL .
+            $a['time'] . NL . $a['onetime'] . NL . $a['ip'] . NL .
+            time() . NL . $code . NL
+    );
+    fclose($handle);
+    return $code;
+}
+
+/**
+  * Finalize an asynchronous upload.
+  * @param $ref asynchronous upload reference
+  * @param $code client code for this operation
+  * @param $crypt boolean asking to crypt or not
+  * @param $link_name_length link name length
+  * @return a string containing the download reference followed by a delete code or a string starting with 'Error'
+  */
+function jirafeau_async_end($ref, $code, $crypt, $link_name_length, $file_hash_method)
+{
+    /* Get async infos. */
+    $a = jirafeau_get_async_ref($ref);
+    if (count($a) == 0
+        || $a['next_code'] != "$code") {
+        return "Error: bad code for ending transfer";
+    }
+
+    /* Generate link infos. */
+    $p = VAR_ASYNC . s2p($ref) . $ref . "_data";
+    if (!file_exists($p)) {
+        return "Error: referenced file does not exist";
+    }
+
+    $crypted = false;
+    $crypt_key = '';
+    if ($crypt == true && extension_loaded('sodium') == true) {
+        $crypt_key = jirafeau_encrypt_file($p, $p.'.crypt');
+        if (strlen($crypt_key) > 0) {
+            if (rename($p.'.crypt', $p) === true) {
+                $crypted = true;
+            }
+        }
+    }
+
+    $hash = jirafeau_hash_file($file_hash_method, $p);
+    $size = filesize($p);
+    $np = s2p($hash);
+    $delete_link_code = jirafeau_gen_random(5);
+
+    /* File already exist ? */
+    if (!file_exists(VAR_FILES . $np)) {
+        @mkdir(VAR_FILES . $np, 0755, true);
+    }
+    if (!file_exists(VAR_FILES . $np . $hash)) {
+        rename($p, VAR_FILES . $np . $hash);
+    }
+
+    /* Increment or create count file. */
+    $counter = 0;
+    if (file_exists(VAR_FILES . $np . $hash . '_count')) {
+        $content = file(VAR_FILES . $np . $hash. '_count');
+        $counter = trim($content[0]);
+    }
+    $counter++;
+    $handle = fopen(VAR_FILES . $np . $hash. '_count', 'w');
+    fwrite($handle, $counter);
+    fclose($handle);
+
+    /* Create link. */
+    $link_tmp_name =  VAR_LINKS . $hash . rand(0, 10000) . '.tmp';
+    $handle = fopen($link_tmp_name, 'w');
+    fwrite(
+        $handle,
+        $a['file_name'] . NL . $a['mime_type'] . NL . $size . NL .
+            $a['key'] . NL . $a['time'] . NL . $hash . NL . $a['onetime'] . NL .
+            time() . NL . $a['ip'] . NL . $delete_link_code . NL . ($crypted ? 'C2' : 'O')
+    );
+    fclose($handle);
+    $hash_link = substr(base_16_to_64(md5_file($link_tmp_name)), 0, $link_name_length);
+    $l = s2p("$hash_link");
+    if (!@mkdir(VAR_LINKS . $l, 0755, true)) {
+        return "Error: cannot create folder in LINKS";
+    }
+    if (!rename($link_tmp_name, VAR_LINKS . $l . $hash_link)) {
+        return "Error: cannot rename file in LINKS";
+    }
+
+    /* Clean async upload. */
+    jirafeau_async_delete($ref);
+    return $hash_link . NL . $delete_link_code . NL . urlencode($crypt_key);
+}
+
+function jirafeau_crypt_create_iv($base, $size)
+{
+    $iv = '';
+    while (strlen($iv) < $size) {
+        $iv = $iv . $base;
+    }
+    $iv = substr($iv, 0, $size);
+    return $iv;
+}
+
+/**
+ * Crypt file using Sodium and returns decrypt key.
+ * @param $fp_src file path to the file to crypt.
+ * @param $fp_dst file path to the file to write crypted file (must not be the same).
+ * @return key used to encrypt the file
+ */
+function jirafeau_encrypt_file($fp_src, $fp_dst)
+{
+    $fs = filesize($fp_src);
+    if ($fs === false || $fs == 0 || extension_loaded('sodium') == false || $fp_src == $fp_dst) {
+        return '';
+    }
+
+    /* Generate key. */
+    $crypt_key = bin2hex(random_bytes(SODIUM_CRYPTO_STREAM_XCHACHA20_KEYBYTES / 2));
+    /* Init module. */
+    [$crypt_state, $crypt_header] = sodium_crypto_secretstream_xchacha20poly1305_init_push($crypt_key);
+    /* Crypt file. */
+    $r = fopen($fp_src, 'rb');
+    $w = fopen($fp_dst, 'wb');
+    fwrite($w, $crypt_header);
+
+    for ($i = 0; $i < $fs; $i += JIRAFEAU_SODIUM_CHUNKSIZE) {
+        $to_enc = fread($r, JIRAFEAU_SODIUM_CHUNKSIZE);
+        $enc = sodium_crypto_secretstream_xchacha20poly1305_push($crypt_state, $to_enc);
+
+        if (fwrite($w, $enc) === false) {
+           return '';
+        }
+    }
+
+    fclose($r);
+    fclose($w);
+
+    /* Cleanup. */
+    sodium_memzero($crypt_state);
+
+    return $crypt_key;
+}
+
+/**
+ * Decrypt file using Sodium.
+ * @param $fp_src file path to the file to decrypt.
+ * @param $fp_dst file path to the file to write decrypted file (must not be the same).
+ * @param $k decryption key
+ * @return true if decryption succeeded, false otherwise
+ */
+function jirafeau_decrypt_file($fp_src, $fp_dst, $k)
+{
+    $fs = filesize($fp_src);
+    if ($fs === false || $fs == 0 || extension_loaded('sodium') == false || $fp_src == $fp_dst) {
+        return false;
+    }
+
+    /* Decrypt file. */
+    $r = fopen($fp_src, 'rb');
+    $w = fopen($fp_dst, 'wb');
+
+    $crypt_header = fread($r, SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_HEADERBYTES);
+
+    /* Init module. */
+    $crypt_state = sodium_crypto_secretstream_xchacha20poly1305_init_pull($crypt_header, $k);
+
+    /* Decrypt file. */
+
+    for ($i = SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_HEADERBYTES; $i < $fs; $i += JIRAFEAU_SODIUM_CHUNKSIZE + SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_ABYTES) {
+        $to_dec = fread($r, JIRAFEAU_SODIUM_CHUNKSIZE + SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_ABYTES);
+        [$dec, $crypt_tag] = sodium_crypto_secretstream_xchacha20poly1305_pull($crypt_state, $to_dec);
+        
+        if (fwrite($w, $dec) === false) {
+            return false;
+        }
+    }
+
+    fclose($r);
+    fclose($w);
+
+    /* Cleanup. */
+    sodium_memzero($crypt_state);
+
+    return true;
+}
+
+/**
+ * Decrypt file using mcrypt.
+ * @param $fp_src file path to the file to decrypt.
+ * @param $fp_dst file path to the file to write decrypted file (could be the same).
+ * @param $k string composed of the key and the iv separated by a point ('.')
+ * @return true if decryption succeeded, false otherwise
+ */
+function jirafeau_decrypt_file_legacy($fp_src, $fp_dst, $k)
+{
+    $fs = filesize($fp_src);
+    if ($fs === false || $fs == 0 || extension_loaded('mcrypt') == false) {
+        return false;
+    }
+
+    /* Init module */
+    $m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
+    /* Extract key and iv. */
+    $crypt_key = $k;
+    $hash_key = md5($crypt_key);
+    $iv = jirafeau_crypt_create_iv($hash_key, mcrypt_enc_get_iv_size($m));
+    /* Init module. */
+    mcrypt_generic_init($m, $hash_key, $iv);
+    /* Decrypt file. */
+    $r = fopen($fp_src, 'r');
+    $w = fopen($fp_dst, 'c');
+    while (!feof($r)) {
+        $dec = mdecrypt_generic($m, fread($r, 1024));
+        if (fwrite($w, $dec) === false) {
+            return false;
+        }
+    }
+    fclose($r);
+    fclose($w);
+    /* Cleanup. */
+    mcrypt_generic_deinit($m);
+    mcrypt_module_close($m);
+    return true;
+}
+
+/**
+ * Check if Jirafeau is password protected for visitors.
+ * @return true if Jirafeau is password protected, false otherwise.
+ */
+function jirafeau_has_upload_password($cfg)
+{
+    return count($cfg['upload_password']) > 0;
+}
+
+/**
+ * Challenge password for a visitor.
+ * @param $password password to be challenged
+ * @return true if password is valid, false otherwise.
+ */
+function jirafeau_challenge_upload_password($cfg, $password)
+{
+    if (!jirafeau_has_upload_password($cfg)) {
+        return false;
+    }
+    foreach ($cfg['upload_password'] as $p) {
+        if ($password == $p) {
+            return true;
+        }
+    }
+    return false;
+}
+
+/**
+ * Test if the given IP is whitelisted by the given list.
+ *
+ * @param $allowedIpList array of allowed IPs
+ * @param $challengedIp IP to be challenged
+ * @return true if IP is authorized, false otherwise.
+ */
+function jirafeau_challenge_ip($allowedIpList, $challengedIp)
+{
+    foreach ($allowedIpList as $i) {
+        if ($i == $challengedIp) {
+            return true;
+        }
+        // CIDR test for IPv4 only.
+        if (strpos($i, '/') !== false) {
+            list($subnet, $mask) = explode('/', $i);
+            if ((ip2long($challengedIp) & ~((1 << (32 - $mask)) - 1)) == ip2long($subnet)) {
+                return true;
+            }
+        }
+    }
+    return false;
+}
+
+/**
+ * Check if Jirafeau has a restriction on the IP address for uploading.
+ * @return true if uploading is IP restricted, false otherwise.
+ */
+function jirafeau_upload_has_ip_restriction($cfg)
+{
+    return count($cfg['upload_ip']) > 0;
+}
+
+/**
+ * Test if visitor's IP is authorized to upload at all.
+ *
+ * @param $cfg configuration
+ * @param $challengedIp IP to be challenged
+ * @return true if IP is authorized, false otherwise.
+ */
+function jirafeau_challenge_upload_ip($cfg, $challengedIp)
+{
+    // If no IP address have been listed, allow upload from any IP
+    if (!jirafeau_upload_has_ip_restriction($cfg)) {
+        return true;
+    }
+    return jirafeau_challenge_ip($cfg['upload_ip'], $challengedIp);
+}
+
+/**
+ * Test if visitor's IP is authorized to upload without a password.
+ *
+ * @param $cfg configuration
+ * @param $challengedIp IP to be challenged
+ * @return true if IP is authorized, false otherwise.
+ */
+function jirafeau_challenge_upload_ip_without_password($cfg, $challengedIp)
+{
+    return jirafeau_challenge_ip($cfg['upload_ip_nopassword'], $challengedIp);
+}
+
+/**
+ * Test if visitor's IP is authorized or password is supplied and authorized
+ * @param $ip IP to be challenged
+ * @param $password password to be challenged
+ * @return true if access is valid, false otherwise.
+ */
+function jirafeau_challenge_upload($cfg, $ip, $password)
+{
+    return jirafeau_challenge_upload_ip_without_password($cfg, $ip) ||
+            (!jirafeau_has_upload_password($cfg) && !jirafeau_upload_has_ip_restriction($cfg)) ||
+            (jirafeau_challenge_upload_password($cfg, $password) && jirafeau_challenge_upload_ip($cfg, $ip));
+}
+
+/**
+ * Check if Jirafeau has a restriction on the IP address for accessing the admin interface.
+ * @return true if admin interface is IP restricted, false otherwise.
+ */
+function jirafeau_admin_has_ip_restriction($cfg)
+{
+    return count($cfg['admin_ip']) > 0;
+}
+
+/**
+ * Test if visitor's IP is authorized to access the admin interface.
+ *
+ * @param $cfg configuration
+ * @param $challengedIp IP to be challenged
+ * @return true if IP is authorized, false otherwise.
+ */
+function jirafeau_challenge_admin_ip($cfg, $challengedIp)
+{
+    // If no IP address have been listed, allow upload from any IP
+    if (!jirafeau_admin_has_ip_restriction($cfg)) {
+        return true;
+    }
+    return jirafeau_challenge_ip($cfg['admin_ip'], $challengedIp);
+}
+
+/** Tell if we have some HTTP headers generated by a proxy */
+function has_http_forwarded()
+{
+    return
+        !empty($_SERVER['HTTP_X_FORWARDED_FOR']) ||
+        !empty($_SERVER['http_X_forwarded_for']);
+}
+
+/**
+ * Generate IP list from HTTP headers generated by a proxy
+ * @return  array of IP strings
+ */
+function get_ip_list_http_forwarded()
+{
+    $ip_list = array();
+    if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
+        $l = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
+        if ($l === false) {
+            return array();
+        }
+        foreach ($l as $ip) {
+            array_push($ip_list, preg_replace('/\s+/', '', $ip));
+        }
+    }
+    if (!empty($_SERVER['http_X_forwarded_for'])) {
+        $l = explode(',', $_SERVER['http_X_forwarded_for']);
+        foreach ($l as $ip) {
+            // Separate IP from port
+            $ipa = explode(':', $ip);
+            if ($ipa === false) {
+                continue;
+            }
+            $ip = $ipa[0];
+            array_push($ip_list, preg_replace('/\s+/', '', $ip));
+        }
+    }
+    return $ip_list;
+}
+
+/**
+ * Get the ip address of the client from REMOTE_ADDR
+ * or from HTTP_X_FORWARDED_FOR if behind a proxy
+ * @returns the client ip address
+ */
+function get_ip_address($cfg)
+{
+    $remote = $_SERVER['REMOTE_ADDR'];
+    if (count($cfg['proxy_ip']) == 0 || !has_http_forwarded()) {
+        return $remote;
+    }
+
+    $ip_list = get_ip_list_http_forwarded();
+    if (count($ip_list) == 0) {
+        return $remote;
+    }
+
+    foreach ($cfg['proxy_ip'] as $proxy_ip) {
+        if ($remote != $proxy_ip) {
+            continue;
+        }
+        // Take the last IP (the one which has been set by the defined proxy).
+        return end($ip_list);
+    }
+    return $remote;
+}
+
+/**
+ * Convert hexadecimal string to base64
+ */
+function hex_to_base64($hex)
+{
+    $b = '';
+    foreach (str_split($hex, 2) as $pair) {
+        $b .= chr(hexdec($pair));
+    }
+    return base64_encode($b);
+}
+
+/**
+ * Replace markers in templates.
+ *
+ * Available markers have the scheme "###MARKERNAME###".
+ *
+ * @param $content string Template text with markers
+ * @param $htmllinebreaks boolean Convert linebreaks to BR-Tags
+ * @return Template with replaced markers
+ */
+function jirafeau_replace_markers($content, $htmllinebreaks = false)
+{
+    $patterns = array(
+        '/###ORGANISATION###/',
+        '/###CONTACTPERSON###/',
+        '/###WEBROOT###/'
+    );
+    $replacements = array(
+        $GLOBALS['cfg']['organisation'],
+        $GLOBALS['cfg']['contactperson'],
+        $GLOBALS['cfg']['web_root']
+    );
+    $content = preg_replace($patterns, $replacements, $content);
+
+    if (true === $htmllinebreaks) {
+        $content = nl2br($content);
+    }
+
+    return $content;
+}
+
+function jirafeau_escape($string)
+{
+    return htmlspecialchars($string, ENT_QUOTES);
+}
+
+function jirafeau_admin_session_start()
+{
+    $_SESSION['admin_auth'] = true;
+    $_SESSION['admin_csrf'] = md5(uniqid(mt_rand(), true));
+}
+
+function jirafeau_session_end()
+{
+    $_SESSION = array();
+    session_destroy();
+}
+
+function jirafeau_admin_session_logged()
+{
+    return isset($_SESSION['admin_auth']) &&
+           isset($_SESSION['admin_csrf']) &&
+           isset($_POST['admin_csrf']) &&
+           $_SESSION['admin_auth'] === true &&
+           $_SESSION['admin_csrf'] === $_POST['admin_csrf'];
+}
+
+function jirafeau_admin_csrf_field()
+{
+    return "<input type='hidden' name='admin_csrf' value='". $_SESSION['admin_csrf'] . "'/>";
+}
+
+function jirafeau_user_session_start()
+{
+    $_SESSION['user_auth'] = true;
+}
+
+function jirafeau_user_session_logged()
+{
+    return isset($_SESSION['user_auth']) &&
+        $_SESSION['user_auth'] === true;
+}
+
+function jirafeau_dir_size($dir)
+{
+    $size = 0;
+    foreach (glob(rtrim($dir, '/').'/*', GLOB_NOSORT) as $entry) {
+        $size += is_file($entry) ? filesize($entry) : jirafeau_dir_size($entry);
+    }
+    return $size;
+}
+
+function jirafeau_export_cfg($cfg)
+{
+    $content = '<?php' . NL;
+    $content .= '/* This file was generated by the install process. ' .
+               'You can edit it. Please see config.original.php to understand the ' .
+               'configuration items. */' . NL;
+    $content .= '$cfg = ' . var_export($cfg, true) . ';';
+
+    $fileWrite = file_put_contents(JIRAFEAU_CFG, $content);
+
+    if (false === $fileWrite) {
+        jirafeau_fatal_error(t('Can not write local configuration file'));
+    }
+}
+
+function jirafeau_mkdir($path)
+{
+    return !(!file_exists($path) && !@mkdir($path, 0755));
+}
+
+/**
+ * Returns true whether the path is writable or we manage to make it
+ * so, which essentially is the same thing.
+ * @param $path is the file or directory to be tested.
+ * @return true if $path is writable.
+ */
+function jirafeau_is_writable($path)
+{
+    /* "@" gets rid of error messages. */
+    return is_writable($path) || @chmod($path, 0777);
+}
+
+function jirafeau_check_var_dir($path)
+{
+    $mkdir_str1 = t('CANNOT_CREATE_DIR') . ':';
+    $mkdir_str2 = t('MANUAL_CREATE');
+    $write_str1 = t('DIR_NOT_W') . ':';
+    $write_str2 = t('You should give the write permission to the web server on ' .
+                    'this directory.');
+    $solution_str = t('HERE_SOLUTION') . ':';
+
+    if (!jirafeau_mkdir($path) || !jirafeau_is_writable($path)) {
+        return array('has_error' => true,
+                      'why' => $mkdir_str1 . '<br /><code>' .
+                               $path . '</code><br />' . $solution_str .
+                               '<br />' . $mkdir_str2);
+    }
+
+    foreach (array('files', 'links', 'async') as $subdir) {
+        $subpath = $path.$subdir;
+
+        if (!jirafeau_mkdir($subpath) || !jirafeau_is_writable($subpath)) {
+            return array('has_error' => true,
+                          'why' => $mkdir_str1 . '<br /><code>' .
+                                   $subpath . '</code><br />' . $solution_str .
+                                   '<br />' . $mkdir_str2);
+        }
+    }
+
+    return array('has_error' => false, 'why' => '');
+}
+
+function jirafeau_add_ending_slash($path)
+{
+    return $path . ((substr($path, -1) == '/') ? '' : '/');
+}
+
+function jirafeau_default_web_root()
+{
+    $url_scheme = (isset($_SERVER['HTTPS'])) ? 'https://' : 'http://';
+    return $url_scheme . $_SERVER['HTTP_HOST'] . str_replace('install.php', '', $_SERVER['REQUEST_URI']);
+}
+
+function jirafeau_get_download_stats($hash)
+{
+    $filename = VAR_LINKS . s2p("$hash") . $hash . '_download';
+
+    if (!file_exists($filename)) {
+        return array('count'=>0);
+    }
+
+    $c = file($filename);
+    $data['count'] = trim($c[0]);
+    $data['date'] = trim($c[1]);
+    $data['ip'] = trim($c[2]);
+
+    return $data;
+}
+
+function jirafeau_write_download_stats($hash, $ip)
+{
+    $data = jirafeau_get_download_stats($hash);
+    $count = $data['count'];
+    $count++;
+
+    $filename = VAR_LINKS . s2p("$hash") . $hash . '_download';
+
+    $handle = fopen($filename, 'w');
+    fwrite($handle, $count . NL . time() . NL . $ip);
+    fclose($handle);
+}