publiccode.si/site/static/cgi/sign.php

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<?php
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require '/var/www/html/vendor/phpmailer/phpmailer/PHPMailerAutoload.php';
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$timer_start = microtime(true); // Start counter for PHP execution time tracking
$codemod = 2138367; // modificator with which the confirmation ID will be obfuscated
$output = "";
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$selfurl = "https://publiccode.eu/sign"; // absolute URL of this PHP script
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$db = "/usr/share/blog/data/signatures/signatures.json"; // Signature database path
$ipdb = "/usr/share/blog/data/signatures/ips.json"; // IP database path
$spamdb = "/usr/share/blog/data/signatures/spammer_" . date('Y-m-d') . ".json"; // This day's potential spammer database
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///////////////////
/// SPAM CHECKS ///
///////////////////
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// Test whether visitor fell for honeypot
$honeypot = isset($_POST['url']) ? $_POST['url'] : false;
if (! empty($honeypot)) { // honeypot input field isn't empty
$output .= "Invalid input. Error code: 5|°4m";
show_page($output, 1);
}
// Check whether IP submitted too often
$limit_hits = 5; // Max. X hits...
$limit_time = 180; // in X seconds
$limit_spam = 15; // More than X hits in $limit_time will get this IP to a special DB
$limit_exceeded = FALSE; // Will be set TRUE if more hits with this IP in $limit_time than $limit_hits
$now = time(); // Current UNIX time
$ip = sha1(php_uname() . $_SERVER['REMOTE_ADDR']); // Hashed IP of visitor
read_ips($ipdb);
$ip_unknown = TRUE;
foreach ($ips as $key => &$entry) {
if ($now - $limit_time > $entry['time']) { // Delete entries that are older than $limit_time
unset($ips[$key]);
} else if ($entry['ip'] === $ip) { // IP matches, and entry under $limit_time
$ip_unknown = FALSE;
if ($entry['hits'] >= $limit_hits) { // Try limit exceeded, iterate and set abort variable
$entry['hits'] = $entry['hits'] + 1;
$limit_exceeded = TRUE;
if ($entry['hits'] > $limit_spam) { // IP exceeds spam limit
if (! file_exists($spamdb)) { touch($spamdb); }
$realip = $_SERVER['REMOTE_ADDR'];
$spammer = file_get_contents($spamdb);
$pattern = preg_quote($realip);
if (! preg_match("/$pattern/", $spammer, $match)) {
file_put_contents($spamdb, $realip . "\n", FILE_APPEND | LOCK_EX);
}
}
} else { // Try limit not exceeded, just iterate
$entry['hits'] = $entry['hits'] + 1;
}
}
}
// Extend IP database if this IP was unknown
if ($ip_unknown) {
$ips[] = array("time" => $now, "ip" => $ip, "hits" => 1);
}
// Write IP database back to file
file_put_contents($ipdb, json_encode($ips, JSON_PRETTY_PRINT), LOCK_EX);
unset($ips);
// Abort if IP limit is exceeded
if ($limit_exceeded) {
$output .= "Too many submits with your IP. Please try again in a few minutes.";
show_page($output, 1);
}
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///////////////////////
/// FORM EVALUATION ///
///////////////////////
// Get basic info from form
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
$action = isset($_POST['action']) ? $_POST['action'] : false;
} else {
$action = isset($_GET['action']) ? $_GET['action'] : false;
}
// Continue only if action = sign/confirmation
// Depending on action, get important variables
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if(empty($action)) {
$output .= "No action defined.";
show_page($output, 1);
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} else if ($action === "sign") { // sign
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$name = isset($_POST['name']) ? $_POST['name'] : false;
$email = isset($_POST['email']) ? $_POST['email'] : false;
$country = isset($_POST['country']) ? $_POST['country'] : false;
$zip = isset($_POST['zip']) ? $_POST['zip'] : false;
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$comment = isset($_POST['comment']) ? $_POST['comment'] : false;
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$permPriv = isset($_POST['permissionPriv']) ? $_POST['permissionPriv'] : false;
$permNews = isset($_POST['permissionNews']) ? $_POST['permissionNews'] : false;
$permPub = isset($_POST['permissionPub']) ? $_POST['permissionPub'] : false;
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// Check for missing required fields
if(empty($name) || empty($email) || empty($permPriv)) {
$output .= "At least one required variable is empty.";
show_page($output, 1);
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}
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} else if ($action === "confirm") { // confirm
$confirmcode = isset($_GET['code']) ? $_GET['code'] : false;
$confirmid = isset($_GET['id']) ? $_GET['id'] : false;
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// Check for missing required fields
if(empty($confirmcode) || empty($confirmid)) {
$output .= "Confirmation code or ID is missing.";
show_page($output, 1);
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}
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} else { // invalid
$output .= "Invalid action.";
show_page($output, 1);
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}
// Validate input
//TODO
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///////////////
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/// SIGNING ///
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///////////////
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if ($action === "sign") {
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read_db($db);
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// Test whether email is a duplicate
$total = count($data);
for ($row = 0; $row < $total; $row++) {
if ($email === $data[$row]['email']) {
$output .= "We already received a signature with this email address.";
show_page($output, 1);
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}
}
// Take sequential ID
$id = $total;
// Create a random string for email verification
$code = rand(1000000000,9999999999) . uniqid();
$codeid = $id + $codemod; // this is to obfuscate the real ID of the user if we don't want to publish this number
// Append new signature to array
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$data[] = array("id" => $id,
"name" => $name,
"email" => $email,
"country" => $country,
"zip" => $zip,
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"comment" => $comment,
"permPriv" => $permPriv,
"permNews" => $permNews,
"permPub" => $permPub,
"code" => $code,
"confirmed" => "no");
// Encode to JSON again and write to file
$allsig = json_encode($data, JSON_PRETTY_PRINT);
file_put_contents($db, $allsig, LOCK_EX);
unset($allsig);
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$mail = new PHPMailer;
$mail->isSMTP();
$mail->Host = "mail.fsfe.org";
$mail->setFrom('noreply@fsfe.org', 'Public Money, Public Code');
// Send email asking for confirmation
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$mail->addAddress($email);
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$mail->Subject = "One step left to sign the \"Public Money - Public Code\" letter";
$mail->Body = "Dear $name, \r\n\r\n" .
"Thank you for signing the open \"Public Money - Public Code\" letter! \r\n\r\n" .
"In order to confirm your signature, please visit following link:\r\n" .
"$selfurl?action=confirm&id=$codeid&code=$code \r\n\r\n" .
"If your confirmation succeeds, your signature will appear on the website within the next few hours.";
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$mail->Send();
$output .= "Thank you for signing our open letter! <br /><br />";
$output .= "We just sent an email to your address ($email) for you to confirm your signature.";
show_page($output, 0);
} else if ($action === "confirm") {
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////////////////////
/// CONFIRMATION ///
////////////////////
$id = $confirmid - $codemod; // substract the obfuscation number from the given ID
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if ($id < 0) { // $confirmid is less than $codemod
$output .= "Invalid signature ID.";
show_page($output, 1);
}
read_db($db);
if (empty($data[$id])) { // there is no array element with this ID
$output .= "The signature ID does not exist.";
show_page($output, 1);
}
$email = $data[$id]['email']; // Get the user's email in case we need it
$code = $data[$id]['code']; // The confirmation code according to the DB
$confirmed = $data[$id]['confirmed']; // The current confirmation status
// Check whether the confirmation code is what we saved in the DB
if ($confirmed === "no") {
if ($confirmcode === $code) {
// Set the user's confirmation key to "yes"
$data[$id]['confirmed'] = "yes";
// Encode to JSON again and write to file
$allsig = json_encode($data, JSON_PRETTY_PRINT); // TODO: JSON_PRETTY_PRINT could be turned off to make file smaller
file_put_contents($db, $allsig, LOCK_EX);
unset($allsig);
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$output .= "Your email address has been confirmed. <br /><br />";
$output .= "Thank you for signing the open letter! Your signature will appear <a href='/signatures/'>in the signature list</a> within the next hours.";
show_page($output, 0);
} else {
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$output .= "The provided confirmation code is incorrect.";
show_page($output, 1);
}
} else if ($confirmed === "yes") {
$output .= "This email address is already confirmed. It can take a few hours until your signature appears <a href='/signatures/'>in the signature list</a>.";
show_page($output, 1);
} else {
$output .= "This signature ID does not exist or the confirmation status is broken.";
show_page($output, 1);
}
} // END confirm
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////////////////
// FUNCTIONS ///
////////////////
// Read signatures database (should only be called if really needed)
function read_db($db) {
global $data; // declare $data a global variable to access it outside this function
if (! file_exists($db)) {
touch($db);
}
$file = file_get_contents($db, true);
$data = json_decode($file, true);
unset($file);
}
// Read IP database
function read_ips($ipdb) {
global $ips; // declare $data a global variable to access it outside this function
if (! file_exists($ipdb)) {
touch($ipdb);
}
$file = file_get_contents($ipdb, true);
$ips = json_decode($file, true);
unset($file);
}
// Replace a given placeholder in a template HTML page with given content
function replace_page($template, $placeholder, $content){
$vars = array($placeholder=>$content);
return str_replace(array_keys($vars), $vars, $template);
}
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// Show the filled template page, depending on exit code
function show_page($output, $exit) {
if ($exit === 0) {
$headline = "Success";
$notice = "";
} else if ($exit === 1) {
$headline = "Error";
$notice = "<p>This error could have happened because one or more fields contained invalid information. Please try again. If you think that you see this error by mistake, please contact us.</p>";
} else {
$headline = "Thank you";
}
$template = file_get_contents('../template/index.html', true);
$page = replace_page($template, ':HEADLINE:', $headline);
$page = replace_page($page, ':BODY1:', $output);
$page = replace_page($page, ':BODY2:', $notice);
echo $page;
unset($data);
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// PHP execution time tracking
global $timer_start;
echo "<!-- PHP execution time: " . (microtime(true) - $timer_start)*1000 . " ms -->\n";
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exit($exit);
}
?>