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Fix: Extract closure to allow using early returns #666

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localheinz wants to merge 1 commit into from
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Fix: Extract closure to allow using early returns #666

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65 changes: 34 additions & 31 deletions manual/add-note.php
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Original file line number Diff line number Diff line change
Expand Up @@ -44,48 +44,49 @@
$user = "Anonymous";
}

// We don't know of any error now
$error = false;

// No note specified
if (strlen($note) == 0) {
$error = "You have not specified the note text.";
}

// SPAM challenge failed
elseif (!test_answer($_POST['func'], $_POST['arga'], $_POST['argb'], $_POST['answer'])) {
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@localheinz localheinz Jul 16, 2022

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This expression here is a bit difficult to refactor in the light of #664:

As @kamil-tekiela pointed out, it makes sense to fail early, and in order to fail early, I would need to add at least one condition here and a try-catch block, to attempt creating a challenge from

  • $_POST['func']
  • $_POST['arga']
  • $_POST['argb']

and if creating a challenge succeeded, compare the expected with the actual answer.

$error = 'SPAM challenge failed.';
}
$error = (static function (string $note, string $user, array $post): ?string {
// No note specified
if (strlen($note) == 0) {
return "You have not specified the note text.";
}

// The user name contains a malicious character
elseif (stristr($user, "|")) {
$error = "You have included bad characters within your username. We appreciate you may want to obfuscate your email further, but we have a system in place to do this for you.";
}
// SPAM challenge failed
if (!test_answer($post['func'], $post['arga'], $post['argb'], $post['answer'])) {
return 'SPAM challenge failed.';
}

// Check if the note is too long
elseif (strlen($note) >= 4096) {
$error = "Your note is too long. You'll have to make it shorter before you can post it. Keep in mind that this is not the place for long code examples!";
}
// The user name contains a malicious character
if (stristr($user, "|")) {
return "You have included bad characters within your username. We appreciate you may want to obfuscate your email further, but we have a system in place to do this for you.";
}

// Check if the note is not too short
elseif (strlen($note) < 32) {
$error = "Your note is too short. Trying to test the notes system? Save us the trouble of deleting your test, and don't. It works.";
}
// Check if the note is too long
if (strlen($note) >= 4096) {
return "Your note is too long. You'll have to make it shorter before you can post it. Keep in mind that this is not the place for long code examples!";
}

// Check if any line is too long
else {
// Check if the note is not too short
if (strlen($note) < 32) {
return "Your note is too short. Trying to test the notes system? Save us the trouble of deleting your test, and don't. It works.";
}

// Check if any line is too long
// Split the note by whitespace, and check length
foreach (preg_split("/\\s+/", $note) as $chunk) {
if (strlen($chunk) > 120) {
$error = "Your note contains a bit of text that will result in a line that is too long, even after using wordwrap().";
break;
return "Your note contains a bit of text that will result in a line that is too long, even after using wordwrap().";
}
}
}

return null;
})(
$note,
$user,
$_POST
);

// No error was found, and the submit action is required
if (!$error && strtolower($_POST['action']) !== "preview") {
if (!is_string($error) && strtolower($_POST['action']) !== "preview") {

$redirip = $_SERVER['HTTP_X_FORWARDED_FOR'] ??
($_SERVER['HTTP_VIA'] ?? '');
Expand Down Expand Up @@ -135,7 +136,9 @@

// There was an error, or a preview is needed
// If there was an error, print out
if ($error) { echo "<p class=\"formerror\">$error</p>\n"; }
if (is_string($error)) {
echo "<p class=\"formerror\">$error</p>\n";
}

// Print out preview of note
echo '<p>This is what your entry will look like, roughly:</p>';
Expand Down