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Implement spamming mitigations for comments

Message ID 20190630114527.15456-2-jelle@vdwaa.nl
State Superseded, archived
Headers show
Series Implement spamming mitigations for comments | expand

Commit Message

Jelle van der Waa June 30, 2019, 11:45 a.m. UTC 
From: Jelle van der Waa <jelle@vdwaa.nl>

Add a hidden input text field named 'website' which is hidden by CSS to
not show up for normal users. Automated bots try to fill in all text
fields, especially 'required' fields such as a 'website' when spamming a
webform. When a comment is posted with the 'website' field filled in
ignore it, so it seems that the submission is succesful.

Signed-off-by: Jelle van der Waa <jelle@vdwaa.nl>
---
 web/html/css/aurweb.css           | 4 ++++
 web/html/pkgbase.php              | 3 ++-
 web/template/pkg_comment_form.php | 1 +
 3 files changed, 7 insertions(+), 1 deletion(-)
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Patch

diff --git a/web/html/css/aurweb.css b/web/html/css/aurweb.css
index ef37bf5..d8716b7 100644
--- a/web/html/css/aurweb.css
+++ b/web/html/css/aurweb.css
@@ -195,3 +195,7 @@  label.confirmation,
 .comments .more {
 	font-weight: normal;
 }
+
+#id_website {
+	display: none;
+}
diff --git a/web/html/pkgbase.php b/web/html/pkgbase.php
index b716644..0241ae3 100644
--- a/web/html/pkgbase.php
+++ b/web/html/pkgbase.php
@@ -117,7 +117,8 @@  if (check_token()) {
 		list($ret, $output) = pkgreq_close($_POST['reqid'], $_POST['reason'], $_POST['comments']);
 	} elseif (current_action("do_EditComaintainers")) {
 		list($ret, $output) = pkgbase_set_comaintainers($base_id, explode("\n", $_POST['users']));
-	} elseif (current_action("do_AddComment")) {
+	} elseif (current_action("do_AddComment") && $_REQUEST['website'] === "") {
+		// website is a hidden field used to detect if a bot filled in all form elements
 		$uid = uid_from_sid($_COOKIE["AURSID"]);
 		list($ret, $output) = pkgbase_add_comment($base_id, $uid, $_REQUEST['comment']);
 		if ($ret && isset($_REQUEST['enable_notifications'])) {
diff --git a/web/template/pkg_comment_form.php b/web/template/pkg_comment_form.php
index 3feee8f..23322a7 100644
--- a/web/template/pkg_comment_form.php
+++ b/web/template/pkg_comment_form.php
@@ -11,6 +11,7 @@ 
 			<p>
 				<textarea id="id_comment" name="comment" cols="80" rows="10"><?= (isset($comment_id)) ? htmlspecialchars($comment) : "" ?></textarea>
 			</p>
+				<input id="id_website" type="text" name="website"/>
 			<p>
 				<input type="submit" value="<?= (isset($comment_id)) ? __("Save") : __("Add Comment") ?>" />
 				<?php if (!isset($comment_id) && !pkgbase_user_notify($uid, $base_id)): ?>