X-Git-Url: https://git.p6c8.net/jirafeau_project.git/blobdiff_plain/48fd211cd255ea9ff05d0556eed4b6033683794a..refs/merge-requests/2/head:/lib/functions.php?ds=inline

diff --git a/lib/functions.php b/lib/functions.php
index 536bfe1..1d0241e 100644
--- a/lib/functions.php
+++ b/lib/functions.php
@@ -101,6 +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'])) {
@@ -130,8 +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;
 }
 
@@ -148,6 +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)
@@ -190,20 +209,23 @@ function jirafeau_ini_to_bytes($value)
     $modifier = substr($value, -1);
     $bytes = substr($value, 0, -1);
     switch (strtoupper($modifier)) {
-    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':
-        $bytes *= 1024;
+        default:
+            return intval($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 $bytes;
 }
@@ -235,13 +257,22 @@ function jirafeau_get_max_upload_size()
  */
 function jirafeau_get_max_upload_chunk_size_bytes($max_upload_chunk_size_bytes = 0)
 {
-    if ($max_upload_chunk_size_bytes > 0) {
-        return min(
-            jirafeau_get_max_upload_size_bytes(),
-            $max_upload_chunk_size_bytes
-        );
+    if ($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;
     }
-    return jirafeau_get_max_upload_size_bytes();
+    $size = min(
+        jirafeau_get_max_upload_size_bytes(),
+        $max_upload_chunk_size_bytes
+    );
+    if ($size == 0) {
+        return $max_upload_chunk_size_bytes;
+    }
+    return $size;
 }
 
 /**
@@ -252,19 +283,19 @@ function jirafeau_get_max_upload_chunk_size_bytes($max_upload_chunk_size_bytes =
 function jirafeau_upload_errstr($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. ');
 }
@@ -416,23 +447,62 @@ function jirafeau_upload($file, $one_time_download, $key, $time, $ip, $crypt, $l
                  'link' => '',
                  'delete_link' => ''));
     }
+    jirafeau_add_file($file, $one_time_download, $key, $time, $ip, $crypt, $link_name_length, $file_hash_method);
+}
 
-    /* array representing no error */
-    $noerr = array('has_error' => false, 'why' => '');
-
+/**
+ * 
+ * @param bool $crypt_module_enabled 
+ * @param string $file_path 
+ * @return array [bool, string]
+ */
+function jirafeau_handle_add_file_encryption($crypt_module_enabled, $file_path) {
     /* 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 ($crypt_module_enabled == true && !(extension_loaded('sodium') == true)) {
+        error_log("PHP extension sodium not loaded, won't encrypt in Jirafeau");
     }
-    if ($crypt == true && extension_loaded('mcrypt') == true) {
-        $crypt_key = jirafeau_encrypt_file($file['tmp_name'], $file['tmp_name']);
+    if ($crypt_module_enabled == true && extension_loaded('sodium') == true) {
+        $crypt_key = jirafeau_encrypt_file($file_path, $file_path.'crypt');
         if (strlen($crypt_key) > 0) {
-            $crypted = true;
+            if (rename($file_path.'crypt', $file_path) === true) {
+                $crypted = true;
+            }
         }
     }
 
+    return [$crypted, $crypt_key];
+}
+
+/**
+ * adds an uploaded or copy/linked local file
+ * @param $file the file struct given by $_FILE[]
+ * @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 $ip uploader's ip
+ * @param $crypt boolean asking to crypt or not
+ * @param $link_name_length size of the link name
+ * @param $is_upload, determines if the file is uploaded or local - it controls which file-functions are used
+ * @return array  an array containing some information
+ *   'error' => information on possible errors
+ *   'link' => the link name of the uploaded file
+ *   'delete_link' => the link code to delete file
+ */
+function jirafeau_add_file($file, $one_time_download, $key, $time, $ip, $crypt, $link_name_length, $file_hash_method, $is_upload = true)
+{
+    // TODO needs to be adapted
+    $move_operation = $is_upload ? 'move_uploaded_file' : 'symlink';
+
+    /* array representing no error */
+    $noerr = array('has_error' => false, 'why' => '');
+
+    $crypted = false;
+    $crypt_key = '';
+    list($crypted, $crypt_key) = jirafeau_handle_add_file_encryption($crypt, $file['tmp_name']);
+
+    
     /* file information */
     $hash = jirafeau_hash_file($file_hash_method, $file['tmp_name']);
     $name = str_replace(NL, '', trim($file['name']));
@@ -445,7 +515,11 @@ function jirafeau_upload($file, $one_time_download, $key, $time, $ip, $crypt, $l
     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 . $hash)) {
+            && 
+            //move_uploaded_file($file['tmp_name'], VAR_FILES . $p . $hash)) 
+            $move_operation($file['tmp_name'], VAR_FILES . $p . $hash))
+            {
+            
         $rc = true;
     }
     if (!$rc) {
@@ -516,6 +590,37 @@ function jirafeau_upload($file, $one_time_download, $key, $time, $ip, $crypt, $l
                   'crypt_key' => $crypt_key);
 }
 
+
+function jirafeau_admin_list_table ($name, $file_hash, $link_hash, $visitor_function = null) {
+    echo '<fieldset><legend>';
+    if (!empty($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>';
+    if ($visitor_function != null) {
+        $visitor_function($name, $file_hash, $link_hash);
+    }
+    echo '</table></fieldset>';
+}
+
+
+
+
+
 /**
  * Tells if a mime-type is viewable in a browser
  * @param $mime the mime type
@@ -633,103 +738,86 @@ function jirafeau_get_link($hash)
     $out['upload_date'] = trim($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;
 }
 
 /**
- * List files in admin interface.
+ * List files ii folder 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($l)) {
-                    continue;
-                }
-
-                /* Filter. */
-                if (!empty($name) && !@preg_match("/$name/i", jirafeau_escape($l['file_name']))) {
-                    continue;
-                }
-                if (!empty($file_hash) && $file_hash != $l['hash']) {
+    $function = function($name, $file_hash, $link_hash) {
+         /* 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 (!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') . ': ' . $l['ip'] . '<br/>';
+                if (is_dir($d . $node)) {
+                    /* Push new found directory. */
+                    $stack[] = $d . $node . '/';
+                } elseif (is_file($d . $node)) {
+                    /* Read link information. */
+                    $l = jirafeau_get_link($node);
+                    if (!count($l)) {
+                        continue;
+                    }
+
+                    /* Filter. */
+                    if (!empty($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 '</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 '</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 = "' . $l['hash'] . '"/>' .
-                jirafeau_admin_csrf_field() .
-                '<input type = "submit" value = "' . t('DEL_FILE_LINKS') . '" />' .
-                '</form>' .
-                '</td>';
-                echo '</tr>';
             }
         }
-    }
-    echo '</table></fieldset>';
+        };
+        jirafeau_admin_list_table($name, $file_hash, $link_hash, $function);
 }
 
 /**
@@ -839,7 +927,7 @@ function jirafeau_fileperms($path)
 function jirafeau_admin_bug_report($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 .= "If you have a problem related to Jirafeau, please <a href='https://gitlab.com/jirafeau/Jirafeau/-/issues'>open an issue</a>, explain your problem in english and copy-paste the following content:<br/><br/><code>";
 
     $out .= "# Jirafeau<br/>";
     $out .= "- version: " . JIRAFEAU_VERSION . "<br/>";
@@ -863,6 +951,7 @@ function jirafeau_admin_bug_report($cfg)
 
     $out .= "# PHP options<br/>";
     $out .= "- php version: " . phpversion() . "<br/>";
+    $out .= "- sodium version: " . phpversion('sodium') . "<br/>";
     $out .= "- mcrypt version: " . phpversion('mcrypt') . "<br/>";
     $php_options =  [
         'post_max_size',
@@ -969,8 +1058,8 @@ function jirafeau_async_delete($ref)
 function jirafeau_async_init($filename, $type, $one_time, $key, $time, $ip)
 {
     /* Create temporary folder. */
-    $ref;
-    $p;
+    $ref = '';
+    $p = '';
     $code = jirafeau_gen_random(4);
     do {
         $ref = jirafeau_gen_random(32);
@@ -1104,10 +1193,12 @@ function jirafeau_async_end($ref, $code, $crypt, $link_name_length, $file_hash_m
 
     $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;
+            }
         }
     }
 
@@ -1142,7 +1233,7 @@ function jirafeau_async_end($ref, $code, $crypt, $link_name_length, $file_hash_m
         $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 ? 'C' : 'O')
+            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, $link_name_length);
@@ -1170,51 +1261,96 @@ function jirafeau_crypt_create_iv($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);
-    $hash_key = md5($crypt_key);
-    $iv = jirafeau_crypt_create_iv($hash_key, mcrypt_enc_get_iv_size($m));
+    $crypt_key = bin2hex(random_bytes(SODIUM_CRYPTO_STREAM_XCHACHA20_KEYBYTES / 2));
     /* Init module. */
-    mcrypt_generic_init($m, $hash_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 || $fs == 0 || extension_loaded('mcrypt') == false) {
@@ -1227,6 +1363,8 @@ function jirafeau_decrypt_file($fp_src, $fp_dst, $k)
     $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');
@@ -1345,6 +1483,31 @@ function jirafeau_challenge_upload($cfg, $ip, $password)
             (jirafeau_challenge_upload_password($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()
 {
@@ -1464,7 +1627,7 @@ function jirafeau_admin_session_start()
     $_SESSION['admin_csrf'] = md5(uniqid(mt_rand(), true));
 }
 
-function jirafeau_admin_session_end()
+function jirafeau_session_end()
 {
     $_SESSION = array();
     session_destroy();
@@ -1484,6 +1647,17 @@ 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)
 {
     $size = 0;
@@ -1562,5 +1736,261 @@ function jirafeau_add_ending_slash($path)
 
 function jirafeau_default_web_root()
 {
-    return $_SERVER['HTTP_HOST'] . str_replace('install.php', '', $_SERVER['REQUEST_URI']);
+    $url_scheme = (isset($_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);
+}
+
+function jirafeau_create_upload_finished_box($preview = true) {
+    ?>
+
+    <div id="upload_finished">
+    <p><?php echo t('FILE_UP') ?></p>
+
+    <div id="upload_finished_download_page">
+    <p>
+        <a id="upload_link" href=""><?php echo t('DL_PAGE') ?></a>
+        <a id="upload_link_email" href=""><img id="upload_image_email"/></a>
+    </p><p>
+        <code id=upload_link_text></code>
+        <button id="upload_link_button">&#128203;</button>
+    </p>
+    </div>
+
+    <?php if ($preview == true) {
+    ?>
+    <div id="upload_finished_preview">
+    <p>
+        <a id="preview_link" href=""><?php echo t('VIEW_LINK') ?></a>
+    </p><p>
+        <code id=preview_link_text></code>
+        <button id="preview_link_button">&#128203;</button>
+    </p>
+    </div>
+    <?php
+} ?>
+
+    <div id="upload_direct_download">
+    <p>
+        <a id="direct_link" href=""><?php echo t('DIRECT_DL') ?></a>
+    </p><p>
+        <code id=direct_link_text></code>
+        <button id="direct_link_button">&#128203;</button>
+    </p>
+    </div>
+
+    <div id="upload_delete">
+    <p>
+        <a id="delete_link" href=""><?php echo t('DELETE_LINK') ?></a>
+    </p><p>
+        <code id=delete_link_text></code>
+        <button id="delete_link_button">&#128203;</button>
+    </p>
+    </div>
+
+    <div id="upload_validity">
+    <p><?php echo t('VALID_UNTIL'); ?>:</p>
+    <p id="date"></p>
+    </div>
+</div>
+<?php 
+}
+
+function jirafeau_get_expiration_time_options() {
+    return 
+    array(
+        array(
+          'value' => 'minute',
+          'label' => '1_MIN'
+        ),
+        array(
+          'value' => 'hour',
+          'label' => '1_H'
+        ),
+        array(
+          'value' => 'day',
+          'label' => '1_D'
+        ),
+        array(
+          'value' => 'week',
+          'label' => '1_W'
+        ),
+        array(
+            'value' => 'fortnight',
+            'label' => '2_W'
+        ),
+        array(
+          'value' => 'month',
+          'label' => '1_M'
+        ),
+        array(
+          'value' => 'quarter',
+          'label' => '1_Q'
+        ),
+        array(
+          'value' => 'year',
+          'label' => '1_Y'
+        ),
+        array(
+          'value' => 'none',
+          'label' => 'NONE'
+        )
+      );
+}
+
+
+
+ /**
+  * 
+  * creates the time selection field
+  * @param mixed $cfg 
+  * @return void 
+  */
+  function jirafeau_create_selection_array($cfg) {
+    echo 
+    '<select name="time" id="select_time">';
+        
+        
+        $expirationTimeOptions = jirafeau_get_expiration_time_options();
+
+        foreach ($expirationTimeOptions as $expirationTimeOption) {
+            $selected = ($expirationTimeOption['value'] === $cfg['availability_default'])? 'selected="selected"' : '';
+            if (true === $cfg['availabilities'][$expirationTimeOption['value']]) {
+                echo '<option value="' . $expirationTimeOption['value'] . '" ' .
+              $selected . '>' . t($expirationTimeOption['label']) . '</option>';
+            }
+        }
+        echo '</select>';
+ }
+
+ function jirafeau_datestr_to_int ($time_str) {
+    $time = time();
+    switch ($time_str) {
+        case 'minute':
+            $time += JIRAFEAU_MINUTE;
+            break;
+        case 'hour':
+            $time += JIRAFEAU_HOUR;
+            break;
+        case 'day':
+            $time += JIRAFEAU_DAY;
+            break;
+        case 'week':
+            $time += JIRAFEAU_WEEK;
+            break;
+        case 'fortnight':
+            $time += JIRAFEAU_FORTNIGHT;
+            break;
+        case 'month':
+            $time += JIRAFEAU_MONTH;
+            break;
+        case 'quarter':
+            $time += JIRAFEAU_QUARTER;
+            break;
+        case 'year':
+            $time += JIRAFEAU_YEAR;
+            break;
+       default:
+            $time = JIRAFEAU_INFINITY;
+            break;
+    }
+    return $time;
+}
+
+
+
+
+/**
+ * links or copy a local file 
+ * TODO: boolean in config for linking
+ * @param string $filepath 
+ * @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 $ip uploader's ip
+ * @param $crypt boolean asking to crypt or not
+ * @param $link_name_length size of the link name
+ * @returns an array containing some information
+ *   'error' => information on possible errors
+ *   'link' => the link name of the uploaded file
+ *   'delete_link' => the link code to delete file
+ */
+function jirafeau_copy_local_file($local_file_path, $one_time_download, $key, $time, $ip, $crypt, $link_name_length, $file_hash_method) {
+    
+    if (!file_exists($local_file_path)) {
+        return (array(
+            'error' =>
+              array('has_error' => true,
+                     'why' => t('INTERNAL_ERROR_FILE_NOT_EXIST')),
+            'link' =>'',
+            'delete_link' => ''));
+    }
+    if(
+        // sanity check if file can be opened
+        $file = fopen($local_file_path, "r")
+    )
+    {
+        // close file pointer - it's not needed here
+        fclose($file);
+        $time_in_int = jirafeau_datestr_to_int($time);
+        return jirafeau_add_file(
+            jirafeau_create_file_array($local_file_path),
+            $one_time_download,
+            $key,
+            $time_in_int,
+            $ip,
+            $crypt,
+            $link_name_length,
+            $file_hash_method,
+            false
+        );
+    }
+    else {
+        return (array(
+            'error' =>
+              array('has_error' => true,
+                     'why' => t('INTERNAL_ERROR_FP_OPEN_LOCAL')),
+            'link' =>'',
+            'delete_link' => ''));
+    }
+    
+}
+
+
+function jirafeau_create_file_array($file_path) {
+    return 
+    [
+       'type' => mime_content_type($file_path),
+       'tmp_name' => $file_path,
+       'name' => basename($file_path),
+       'size' => filesize($file_path),
+    ];
 }