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April 14, 2019 22:09
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Create single-use links for files. Code from 2012-10-08. There are probably more robust solutions than this: it is okay to read, it is less okay to use.
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| <?php | |
| /* Result of some quick night-coding, so don't expect much. | |
| There should be a show.db sqlite3 database with a schema like | |
| in line 22. | |
| If there isn't a new one is created with helloworld as a default password. | |
| New passwords can be created, they are stored as sha1() hashes. | |
| One can create a new link on show.php?mode=admin; the file names are paths on the web server. | |
| The links are going to look like this: show.php?session=SESSION | |
| Please keep in mind, that using an sqlite database isn't very secure. Using GET variables instead of POSTed sessions, either. | |
| */ | |
| $database_init = false; | |
| if (!file_exists('show.db')) { | |
| touch('show.db'); | |
| $database_init = true; | |
| } | |
| $db = new PDO('sqlite:show.db'); | |
| if ($database_init) { | |
| $db->exec(sprintf("CREATE TABLE files (filename varchar, hash varchar, unique(hash)); CREATE TABLE passwords (hash varchar); INSERT INTO passwords VALUES ('%s')", sha1(isset($_GET['defaultpassword']) ? $_GET['defaultpassword'] : 'helloworld' ))); | |
| } | |
| if (isset($_GET['session']) && ($session = $_GET['session'])) { | |
| $hash = sha1($_GET['session']); | |
| $q = $db->query(sprintf("SELECT filename FROM files WHERE hash='%s'", $hash)); | |
| if ($filename = $q->fetch()) { | |
| $q = $db->query(sprintf("DELETE FROM files WHERE hash='%s'", $hash)); | |
| if ($q->rowCount() > 0) { | |
| header('Content-type: ' . finfo_file(finfo_open(FILEINFO_MIME_TYPE), $filename['filename'])); | |
| echo file_get_contents($filename['filename']); | |
| } else { | |
| "Error: cannot delete session. You won't see this file until someone smart fixes this."; | |
| } | |
| } else { | |
| die("Error: No such file."); | |
| } | |
| } elseif ((isset($_GET['mode'])) && ('admin' == $_GET['mode'])) { | |
| ?> | |
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Add your file name and get your hash...</title> | |
| </head> | |
| <body> | |
| <form action="show.php" method="post" id="pwdform"> | |
| <div> | |
| <label for="filename">File Name</label><input type="text" id="filename" name="filename"> | |
| <label for="password">Password</label><input type="password" id="password" name="password"> | |
| <input type="submit"> | |
| </div> | |
| </form> | |
| </body> | |
| </html> | |
| <?php | |
| } elseif ((isset($_POST['password'])) && ($password = $_POST['password']) && ((isset($_POST['filename'])) && ($filenam = $_POST['filename']))) { | |
| $q = $db->query(sprintf("SELECT * FROM passwords WHERE hash='%s'", sha1($password))); | |
| if ($q->fetch()) { | |
| if (!$db->quote('dummy')) { die("DB Error: String quoting not supported."); } | |
| $hash = sha1($id = uniqid("", true)); | |
| $q = $db->query(sprintf("INSERT INTO files VALUES(%s, %s)", $db->quote($_POST['filename']), $db->quote($hash))); | |
| if ($q->rowCount()) { | |
| printf('Your file is available once on the <a href="show.php?session=%s">following link</a>.', $id); | |
| } else { | |
| die("DB error happened."); | |
| print_r($db->errorInfo()); | |
| } | |
| } else { | |
| die("Auth error."); | |
| } | |
| } else { | |
| die("There was an error in your request."); | |
| } |
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