X-Git-Url: https://git.p6c8.net/jirafeau_project.git/blobdiff_plain/db2c9c7773cd5d14b732689b2e844e62d2773be5..45ca48c235e1ac4634799231dff0962fce2e3fbf:/lib/functions.php

diff --git a/lib/functions.php b/lib/functions.php
index 3a50eac..b6672fb 100644
--- a/lib/functions.php
+++ b/lib/functions.php
@@ -2,7 +2,7 @@
 /*
  *  Jirafeau, your web file repository
  *  Copyright (C) 2008  Julien "axolotl" BERNARD <axolotl@magieeternelle.org>
- *  Copyright (C) 2015  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
@@ -20,14 +20,21 @@
  */
 
 /**
- * Transform a string in a path by seperating each letters by a '/'.
+ * 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} . '/';
+        $p .= $s[$i];
+        if (($i + 1) % $block_size == 0) {
+            $p .= '/';
+        }
+    }
+    if (strlen($s) % $block_size != 0) {
+        $p .= '/';
     }
     return $p;
 }
@@ -61,16 +68,16 @@ function base_16_to_64($num)
     # Convert long hex string to bin.
     $size = strlen($num);
     for ($i = 0; $i < $size; $i++) {
-        $b .= $hex2bin{hexdec($num{$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;
+        $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;
+        $o = $m[bindec(substr($b, 0, $i + 6))] . $o;
     }
     return $o;
 }
@@ -94,6 +101,19 @@ function jirafeau_gen_random($l)
     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'])) {
@@ -123,8 +143,11 @@ function jirafeau_human_size($octets)
 // Convert UTC timestamp to a datetime field
 function jirafeau_get_datetimefield($timestamp)
 {
-    $content = '<span class="datetime" data-datetime="' . strftime('%Y-%m-%d %H:%M', $timestamp) . '">'
-        . strftime('%Y-%m-%d %H:%M', $timestamp) . ' (GMT)</span>';
+
+    $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;
 }
 
@@ -141,6 +164,9 @@ function jirafeau_clean_rm_link($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)
@@ -152,10 +178,10 @@ function jirafeau_clean_rm_link($link)
     }
 }
 
-function jirafeau_clean_rm_file($md5)
+function jirafeau_clean_rm_file($hash)
 {
-    $p = s2p("$md5");
-    $f = VAR_FILES . $p . $md5;
+    $p = s2p("$hash");
+    $f = VAR_FILES . $p . $hash;
     if (file_exists($f) && is_file($f)) {
         unlink($f);
     }
@@ -183,16 +209,23 @@ 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':
-        $bytes *= 1024;
+        default:
+            return intval($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 $bytes;
 }
@@ -203,8 +236,10 @@ function jirafeau_ini_to_bytes($value)
  */
 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')));
+    return min(
+        jirafeau_ini_to_bytes(ini_get('post_max_size')),
+        jirafeau_ini_to_bytes(ini_get('upload_max_filesize'))
+    );
 }
 
 /**
@@ -213,9 +248,31 @@ function jirafeau_get_max_upload_size_bytes()
  */
 function jirafeau_get_max_upload_size()
 {
-    return jirafeau_human_size(
-            min(jirafeau_ini_to_bytes(ini_get('post_max_size')),
-                 jirafeau_ini_to_bytes(ini_get('upload_max_filesize'))));
+    return jirafeau_human_size(jirafeau_get_max_upload_size_bytes());
+}
+
+/**
+ * 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;
 }
 
 /**
@@ -226,19 +283,19 @@ function jirafeau_get_max_upload_size()
 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_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_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. ');
+        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. ');
 }
@@ -256,31 +313,31 @@ function jirafeau_delete_link($link)
 
     jirafeau_clean_rm_link($link);
 
-    $md5 = $l['md5'];
-    $p = s2p("$md5");
+    $hash = $l['hash'];
+    $p = s2p("$hash");
 
     $counter = 1;
-    if (file_exists(VAR_FILES . $p . $md5. '_count')) {
-        $content = file(VAR_FILES . $p . $md5. '_count');
+    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 . $md5. '_count', 'w');
+        $handle = fopen(VAR_FILES . $p . $hash. '_count', 'w');
         fwrite($handle, $counter);
         fclose($handle);
     }
 
     if ($counter == 0) {
-        jirafeau_clean_rm_file($md5);
+        jirafeau_clean_rm_file($hash);
     }
 }
 
 /**
  * Delete a file and it's links.
  */
-function jirafeau_delete_file($md5)
+function jirafeau_delete_file($hash)
 {
     $count = 0;
     /* Get all links files. */
@@ -303,17 +360,69 @@ function jirafeau_delete_file($md5)
                 if (!count($l)) {
                     continue;
                 }
-                if ($l['md5'] == $md5) {
+                if ($l['hash'] == $hash) {
                     $count++;
                     jirafeau_delete_link($node);
                 }
             }
         }
     }
-    jirafeau_clean_rm_file($md5);
+    jirafeau_clean_rm_file($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;
+}
+
 /**
  * handles an uploaded file
  * @param $file the file struct given by $_FILE[]
@@ -328,7 +437,7 @@ function jirafeau_delete_file($md5)
  *   '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, $ip, $crypt, $link_name_length)
+function jirafeau_upload($file, $one_time_download, $key, $time, $ip, $crypt, $link_name_length, $file_hash_method)
 {
     if (empty($file['tmp_name']) || !is_uploaded_file($file['tmp_name'])) {
         return (array(
@@ -345,29 +454,31 @@ function jirafeau_upload($file, $one_time_download, $key, $time, $ip, $crypt, $l
     /* Crypt file if option is enabled. */
     $crypted = false;
     $crypt_key = '';
-    if ($crypt == true && !(extension_loaded('mcrypt') == true)) {
-        error_log("PHP extension mcrypt not loaded, won't encrypt in Jirafeau");
+    if ($crypt == true && !(extension_loaded('sodium') == true)) {
+        error_log("PHP extension sodium not loaded, won't encrypt in Jirafeau");
     }
-    if ($crypt == true && extension_loaded('mcrypt') == true) {
-        $crypt_key = jirafeau_encrypt_file($file['tmp_name'], $file['tmp_name']);
+    if ($crypt == true && extension_loaded('sodium') == true) {
+        $crypt_key = jirafeau_encrypt_file($file['tmp_name'], $file['tmp_name'].'crypt');
         if (strlen($crypt_key) > 0) {
-            $crypted = true;
+            if (rename($file['tmp_name'].'crypt', $file['tmp_name']) === true) {
+                $crypted = true;
+            }
         }
     }
 
-    /* file informations */
-    $md5 = md5_file($file['tmp_name']);
+    /* 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;
-    $p = s2p("$md5");
-    if (file_exists(VAR_FILES . $p .  $md5)) {
+    $p = s2p("$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 . $md5)) {
+            && move_uploaded_file($file['tmp_name'], VAR_FILES . $p . $hash)) {
         $rc = true;
     }
     if (!$rc) {
@@ -381,47 +492,49 @@ function jirafeau_upload($file, $one_time_download, $key, $time, $ip, $crypt, $l
 
     /* Increment or create count file. */
     $counter = 0;
-    if (file_exists(VAR_FILES . $p . $md5 . '_count')) {
-        $content = file(VAR_FILES . $p . $md5. '_count');
+    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 . $md5. '_count', 'w');
+    $handle = fopen(VAR_FILES . $p . $hash. '_count', 'w');
     fwrite($handle, $counter);
     fclose($handle);
 
     /* Create delete code. */
     $delete_link_code = jirafeau_gen_random(5);
 
-    /* md5 password or empty. */
+    /* hash password or empty. */
     $password = '';
     if (!empty($key)) {
         $password = md5($key);
     }
 
     /* create link file */
-    $link_tmp_name =  VAR_LINKS . $md5 . rand(0, 10000) . '.tmp';
+    $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 . $md5. NL . ($one_time_download ? 'O' : 'R') . NL . time() .
-            NL . $ip . NL. $delete_link_code . NL . ($crypted ? 'C' : 'O'));
+    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')
+    );
     fclose($handle);
-    $md5_link = substr(base_16_to_64(md5_file($link_tmp_name)), 0, $link_name_length);
-    $l = s2p("$md5_link");
+    $hash_link = substr(base_16_to_64(md5_file($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 . $md5_link)) {
+        !rename($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 . $md5. '_count', 'w');
+            $handle = fopen(VAR_FILES . $p . $hash. '_count', 'w');
             fwrite($handle, $counter);
             fclose($handle);
         } else {
-            jirafeau_clean_rm_file($md5_link);
+            jirafeau_clean_rm_file($hash_link);
         }
         return array(
                  'error' =>
@@ -431,7 +544,7 @@ function jirafeau_upload($file, $one_time_download, $key, $time, $ip, $crypt, $l
                  'delete_link' => '');
     }
     return array( 'error' => $noerr,
-                  'link' => $md5_link,
+                  'link' => $hash_link,
                   'delete_link' => $delete_link_code,
                   'crypt_key' => $crypt_key);
 }
@@ -444,10 +557,15 @@ function jirafeau_upload($file, $one_time_download, $key, $time, $ip, $crypt, $l
 function jirafeau_is_viewable($mime)
 {
     if (!empty($mime)) {
-        /* Actually, verify if mime-type is an image or a text. */
-        $viewable = array('image', 'text', 'video', 'audio');
+        $viewable = array('image', 'video', 'audio');
         $decomposed = explode('/', $mime);
-        return in_array($decomposed[0], $viewable);
+        if (in_array($decomposed[0], $viewable) && strpos($mime, 'image/svg+xml') === false) {
+            return true;
+        }
+        $viewable = array('text/plain');
+        if (in_array($mime, $viewable)) {
+            return true;
+        }
     }
     return false;
 }
@@ -494,32 +612,39 @@ function show_errors()
 
 function check_errors($cfg)
 {
-    if (file_exists(JIRAFEAU_ROOT . 'install.php')
-        && !($cfg['installation_done'] === true)) {
-        header('Location: install.php');
-        exit;
+    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'));
+        }
     }
 
-    /* check if the destination dirs are writable */
-    $writable = is_writable(VAR_FILES) && is_writable(VAR_LINKS);
-
-    /* Checking for errors. */
     if (!is_writable(VAR_FILES)) {
-        add_error(t('The file directory is not writable!'), VAR_FILES);
+        add_error(t('FILE_DIR_W'), VAR_FILES);
     }
 
     if (!is_writable(VAR_LINKS)) {
-        add_error(t('The link directory is not 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 informations
- * @return array containing informations.
+ * Read link information
+ * @return array containing information.
  */
 function jirafeau_get_link($hash)
 {
@@ -536,12 +661,13 @@ function jirafeau_get_link($hash)
     $out['file_size'] = trim($c[2]);
     $out['key'] = trim($c[3], NL);
     $out['time'] = trim($c[4]);
-    $out['md5'] = trim($c[5]);
+    $out['hash'] = trim($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]) == 'C';
+    $out['crypted'] = trim($c[10]) == 'C2';
+    $out['crypted_legacy'] = trim($c[10]) == 'C';
 
     return $out;
 }
@@ -553,13 +679,13 @@ function jirafeau_admin_list($name, $file_hash, $link_hash)
 {
     echo '<fieldset><legend>';
     if (!empty($name)) {
-        echo t('FILENAME') . ": $name ";
+        echo t('FILENAME') . ": " . jirafeau_escape($name);
     }
     if (!empty($file_hash)) {
-        echo t('FILE') . ": $file_hash ";
+        echo t('FILE') . ": " . jirafeau_escape($file_hash);
     }
     if (!empty($link_hash)) {
-        echo t('LINK') . ": $link_hash ";
+        echo t('LINK') . ": " . jirafeau_escape($link_hash);
     }
     if (empty($name) && empty($file_hash) && empty($link_hash)) {
         echo t('LS_FILES');
@@ -567,14 +693,8 @@ function jirafeau_admin_list($name, $file_hash, $link_hash)
     echo '</legend>';
     echo '<table>';
     echo '<tr>';
-    echo '<td>' . t('FILENAME') . '</td>';
-    echo '<td>' . t('TYPE') . '</td>';
-    echo '<td>' . t('SIZE') . '</td>';
-    echo '<td>' . t('EXPIRE') . '</td>';
-    echo '<td>' . t('ONETIME') . '</td>';
-    echo '<td>' . t('UPLOAD_DATE') . '</td>';
-    echo '<td>' . t('ORIGIN') . '</td>';
-    echo '<td>' . t('ACTION') . '</td>';
+    echo '<th></th>';
+    echo '<th>' . t('ACTION') . '</th>';
     echo '</tr>';
 
     /* Get all links files. */
@@ -590,54 +710,58 @@ function jirafeau_admin_list($name, $file_hash, $link_hash)
                 /* Push new found directory. */
                 $stack[] = $d . $node . '/';
             } elseif (is_file($d . $node)) {
-                /* Read link informations. */
+                /* 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($l['file_name']))) {
+                if (!empty($name) && !@preg_match("/$name/i", jirafeau_escape($l['file_name']))) {
                     continue;
                 }
-                if (!empty($file_hash) && $file_hash != $l['md5']) {
+                if (!empty($file_hash) && $file_hash != $l['hash']) {
                     continue;
                 }
                 if (!empty($link_hash) && $link_hash != $node) {
                     continue;
                 }
-                /* Print link informations. */
+                /* Print link information. */
                 echo '<tr>';
                 echo '<td>' .
                 '<strong><a id="upload_link" href="f.php?h='. jirafeau_escape($node) .'" title="' .
-                    t('DL_PAGE') . '">' . jirafeau_escape($l['file_name']) . '</a></strong>';
-                echo '</td>';
-                echo '<td>' . jirafeau_escape($l['mime_type']) . '</td>';
-                echo '<td>' . jirafeau_human_size($l['file_size']) . '</td>';
-                echo '<td>' . ($l['time'] == -1 ? '∞' : jirafeau_get_datetimefield($l['time'])) . '</td>';
-                echo '<td>';
-                if ($l['onetime'] == 'O') {
-                    echo 'Y';
-                } else {
-                    echo 'N';
+                    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') . ': ' . $l['ip'] . '<br/>';
                 }
-                echo '</td>';
-                echo '<td>' . jirafeau_get_datetimefield($l['upload_date']) . '</td>';
-                echo '<td>' . $l['ip'] . '</td>';
-                echo '<td>' .
-                '<form method="post">' .
+                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 = "md5" value = "' . $l['md5'] . '"/>' .
+                '<input type = "hidden" name = "hash" value = "' . $l['hash'] . '"/>' .
+                jirafeau_admin_csrf_field() .
                 '<input type = "submit" value = "' . t('DEL_FILE_LINKS') . '" />' .
                 '</form>' .
                 '</td>';
@@ -670,15 +794,15 @@ function jirafeau_admin_clean()
                 /* Push new found directory. */
                 $stack[] = $d . $node . '/';
             } elseif (is_file($d . $node)) {
-                /* Read link informations. */
+                /* Read link information. */
                 $l = jirafeau_get_link(basename($node));
                 if (!count($l)) {
                     continue;
                 }
-                $p = s2p($l['md5']);
+                $p = s2p($l['hash']);
                 if ($l['time'] > 0 && $l['time'] < time() || // expired
-                    !file_exists(VAR_FILES . $p . $l['md5']) || // invalid
-                    !file_exists(VAR_FILES . $p . $l['md5'] . '_count')) { // invalid
+                    !file_exists(VAR_FILES . $p . $l['hash']) || // invalid
+                    !file_exists(VAR_FILES . $p . $l['hash'] . '_count')) { // invalid
                     jirafeau_delete_link($node);
                     $count++;
                 }
@@ -690,7 +814,7 @@ function jirafeau_admin_clean()
 
 
 /**
- * Clean old async transferts.
+ * Clean old async transfers.
  * @return number of cleaned files.
  */
 function jirafeau_admin_clean_async()
@@ -711,12 +835,12 @@ function jirafeau_admin_clean_async()
                 /* Push new found directory. */
                 $stack[] = $d . $node . '/';
             } elseif (is_file($d . $node)) {
-                /* Read async informations. */
+                /* Read async information. */
                 $a = jirafeau_get_async_ref(basename($node));
                 if (!count($a)) {
                     continue;
                 }
-                /* Delete transferts older than 1 hour. */
+                /* Delete transfers older than 1 hour. */
                 if (time() - $a['last_edited'] > 3600) {
                     jirafeau_async_delete(basename($node));
                     $count++;
@@ -726,9 +850,109 @@ function jirafeau_admin_clean_async()
     }
     return $count;
 }
+
 /**
- * Read async transfert informations
- * @return array containing informations.
+ * Better strval function for debug purposes
+ */
+function jirafeau_strval($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)
 {
@@ -752,7 +976,7 @@ function jirafeau_get_async_ref($ref)
 }
 
 /**
- * Delete async transfert informations
+ * Delete async transfer information
  */
 function jirafeau_async_delete($ref)
 {
@@ -776,17 +1000,15 @@ function jirafeau_async_delete($ref)
 
 /**
   * Init a new asynchronous upload.
-  * @param $finename Name of the file to send
+  * @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 $ip ip address of the client
-  * @return a string containing a temporary reference followed by a code or the string 'Error'
+  * @return a string containing a temporary reference followed by a code or a string starting with 'Error'
   */
 function jirafeau_async_init($filename, $type, $one_time, $key, $time, $ip)
 {
-    $res = 'Error';
-
     /* Create temporary folder. */
     $ref;
     $p;
@@ -797,24 +1019,29 @@ function jirafeau_async_init($filename, $type, $one_time, $key, $time, $ip)
     } while (file_exists($p));
     @mkdir($p, 0755, true);
     if (!file_exists($p)) {
-        echo 'Error';
-        return;
+        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 informations. */
+    /* Store information. */
     $p .= $ref;
     $handle = fopen($p, 'w');
-    fwrite($handle,
-            str_replace(NL, '', trim($filename)) . NL .
+    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);
+            time() . NL . $code . NL
+    );
     fclose($handle);
 
     return $ref . NL . $code ;
@@ -826,7 +1053,7 @@ function jirafeau_async_init($filename, $type, $one_time, $key, $time, $ip)
   * @param $file piece of data
   * @param $code client code for this operation
   * @param $max_file_size maximum allowed file size
-  * @return a string containing a next code to use or the string "Error"
+  * @return a string containing a next code to use or a string starting with 'Error'
   */
 function jirafeau_async_push($ref, $data, $code, $max_file_size)
 {
@@ -834,11 +1061,22 @@ function jirafeau_async_push($ref, $data, $code, $max_file_size)
     $a = jirafeau_get_async_ref($ref);
 
     /* Check some errors. */
-    if (count($a) == 0
-        || $a['next_code'] != "$code"
-        || empty($data['tmp_name'])
-        || !is_uploaded_file($data['tmp_name'])) {
-        return 'Error';
+    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);
@@ -851,7 +1089,7 @@ function jirafeau_async_push($ref, $data, $code, $max_file_size)
     if ($max_file_size > 0 &&
         filesize($r_path) + filesize($w_path) > $max_file_size * 1024 * 1024) {
         jirafeau_async_delete($ref);
-        return 'Error';
+        return "Error: file size is above upload limit";
     }
 
     /* Concatenate data. */
@@ -862,7 +1100,7 @@ function jirafeau_async_push($ref, $data, $code, $max_file_size)
             fclose($r);
             fclose($w);
             jirafeau_async_delete($ref);
-            return 'Error';
+            return "Error: cannot write file";
         }
     }
     fclose($r);
@@ -872,88 +1110,96 @@ function jirafeau_async_push($ref, $data, $code, $max_file_size)
     /* 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 .
+    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);
+            time() . NL . $code . NL
+    );
     fclose($handle);
     return $code;
 }
 
 /**
-  * Finalyze an asynchronous upload.
+  * 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 $link_name_length link name length
-  * @return a string containing the download reference followed by a delete code or the string 'Error'
+  * @return a string containing the download reference followed by a delete code or a string starting with 'Error'
   */
-function jirafeau_async_end($ref, $code, $crypt, $link_name_length)
+function jirafeau_async_end($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";
+        return "Error: bad code for ending transfer";
     }
 
     /* Generate link infos. */
     $p = VAR_ASYNC . s2p($ref) . $ref . "_data";
     if (!file_exists($p)) {
-        return 'Error';
+        return "Error: referenced file does not exist";
     }
 
     $crypted = false;
     $crypt_key = '';
-    if ($crypt == true && extension_loaded('mcrypt') == true) {
-        $crypt_key = jirafeau_encrypt_file($p, $p);
+    if ($crypt == true && extension_loaded('sodium') == true) {
+        $crypt_key = jirafeau_encrypt_file($p, $p.'.crypt');
         if (strlen($crypt_key) > 0) {
-            $crypted = true;
+            if (rename($p.'.crypt', $p) === true) {
+                $crypted = true;
+            }
         }
     }
 
-    $md5 = md5_file($p);
+    $hash = jirafeau_hash_file($file_hash_method, $p);
     $size = filesize($p);
-    $np = s2p($md5);
+    $np = s2p($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 . $md5)) {
-        rename($p, VAR_FILES . $np . $md5);
+    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 . $md5 . '_count')) {
-        $content = file(VAR_FILES . $np . $md5. '_count');
+    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 . $md5. '_count', 'w');
+    $handle = fopen(VAR_FILES . $np . $hash. '_count', 'w');
     fwrite($handle, $counter);
     fclose($handle);
 
     /* Create link. */
-    $link_tmp_name =  VAR_LINKS . $md5 . rand(0, 10000) . '.tmp';
+    $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 . $md5 . NL . $a['onetime'] . NL .
-            time() . NL . $a['ip'] . NL . $delete_link_code . NL . ($crypted ? 'C' : 'O'));
+    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);
-    $md5_link = substr(base_16_to_64(md5_file($link_tmp_name)), 0, $link_name_length);
-    $l = s2p("$md5_link");
-    if (!@mkdir(VAR_LINKS . $l, 0755, true) ||
-        !rename($link_tmp_name, VAR_LINKS . $l . $md5_link)) {
-        echo "Error";
+    $hash_link = substr(base_16_to_64(md5_file($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 $md5_link . NL . $delete_link_code . NL . urlencode($crypt_key);
+    return $hash_link . NL . $delete_link_code . NL . urlencode($crypt_key);
 }
 
 function jirafeau_crypt_create_iv($base, $size)
@@ -967,51 +1213,96 @@ function jirafeau_crypt_create_iv($base, $size)
 }
 
 /**
- * Crypt file and returns decrypt key.
+ * 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 (could be the same).
- * @return decrypt key composed of the key and the iv separated by a point ('.')
+ * @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 || $fs == 0 || !(extension_loaded('mcrypt') == true)) {
+    if ($fs === false || $fs == 0 || extension_loaded('sodium') == false || $fp_src == $fp_dst) {
         return '';
     }
 
-    /* Prepare module. */
-    $m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
     /* Generate key. */
-    $crypt_key = jirafeau_gen_random(10);
-    $md5_key = md5($crypt_key);
-    $iv = jirafeau_crypt_create_iv($md5_key, mcrypt_enc_get_iv_size($m));
+    $crypt_key = bin2hex(random_bytes(SODIUM_CRYPTO_STREAM_XCHACHA20_KEYBYTES / 2));
     /* Init module. */
-    mcrypt_generic_init($m, $md5_key, $iv);
+    [$crypt_state, $crypt_header] = sodium_crypto_secretstream_xchacha20poly1305_init_push($crypt_key);
     /* Crypt file. */
-    $r = fopen($fp_src, 'r');
-    $w = fopen($fp_dst, 'c');
-    while (!feof($r)) {
-        $enc = mcrypt_generic($m, fread($r, 1024));
+    $r = fopen($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, $enc) === false) {
-            return '';
+           return '';
         }
     }
+
     fclose($r);
     fclose($w);
+
     /* Cleanup. */
-    mcrypt_generic_deinit($m);
-    mcrypt_module_close($m);
+    sodium_memzero($crypt_state);
+
     return $crypt_key;
 }
 
 /**
- * Decrypt file.
+ * 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 $k string composed of the key and the iv separated by a point ('.')
- * @return key used to decrypt. a string of length 0 is returned if failed.
+ * @return true if decryption succeeded, false otherwise
  */
-function jirafeau_decrypt_file($fp_src, $fp_dst, $k)
+function jirafeau_decrypt_file_legacy($fp_src, $fp_dst, $k)
 {
     $fs = filesize($fp_src);
     if ($fs === false || $fs == 0 || extension_loaded('mcrypt') == false) {
@@ -1022,8 +1313,10 @@ function jirafeau_decrypt_file($fp_src, $fp_dst, $k)
     $m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
     /* Extract key and iv. */
     $crypt_key = $k;
-    $md5_key = md5($crypt_key);
-    $iv = jirafeau_crypt_create_iv($md5_key, mcrypt_enc_get_iv_size($m));
+    $hash_key = md5($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');
@@ -1069,19 +1362,14 @@ function jirafeau_challenge_upload_password($cfg, $password)
 }
 
 /**
- * Test if visitor's IP is authorized to upload.
+ * Test if the given IP is whitelisted by the given list.
  *
  * @param $allowedIpList array of allowed IPs
  * @param $challengedIp IP to be challenged
  * @return true if IP is authorized, false otherwise.
  */
-function jirafeau_challenge_upload_ip($allowedIpList, $challengedIp)
+function jirafeau_challenge_ip($allowedIpList, $challengedIp)
 {
-    // skip if list is empty = all IPs allowed
-    if (count($allowedIpList) == 0) {
-        return true;
-    }
-    // test given IP against each allowed IP
     foreach ($allowedIpList as $i) {
         if ($i == $challengedIp) {
             return true;
@@ -1097,43 +1385,79 @@ function jirafeau_challenge_upload_ip($allowedIpList, $challengedIp)
     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, $password)
+function jirafeau_challenge_upload($cfg, $ip, $password)
 {
-    // Allow if no ip restrictaion and no password restriction
-    if ((count ($cfg['upload_ip']) == 0) and (count ($cfg['upload_password']) == 0)) {
-        return true;
-    }
+    return jirafeau_challenge_upload_ip_without_password($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));
+}
 
-    // Allow if ip is in array
-    foreach ($cfg['upload_ip'] as $i) {
-        if ($i == $ip) {
-            return true;
-        }
-        // CIDR test for IPv4 only.
-        if (strpos ($i, '/') !== false)
-        {
-            list ($subnet, $mask) = explode('/', $i);
-            if ((ip2long ($ip) & ~((1 << (32 - $mask)) - 1) ) == ip2long ($subnet)) {
-                return true;
-            }
-        }
-    }
-    if (!jirafeau_has_upload_password($cfg)) {
-        return false;
-    }
+/**
+ * Check if Jirafeau has a restriction on the IP address for accessing the admin interface.
+ * @return true if admin interface is IP restricted, false otherwise.
+ */
+function jirafeau_admin_has_ip_restriction($cfg)
+{
+    return count($cfg['admin_ip']) > 0;
+}
 
-    foreach ($cfg['upload_password'] as $p) {
-        if ($password == $p) {
-            return true;
-        }
+/**
+ * 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 false;
+    return jirafeau_challenge_ip($cfg['admin_ip'], $challengedIp);
 }
 
 /** Tell if we have some HTTP headers generated by a proxy */
@@ -1248,3 +1572,151 @@ 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);
+}