Import contact.php for simple mostly static websites

1 files changed, 57 insertions, 0 deletions

diff --git a/contact.php b/contact.php
new file mode 100644
index 0000000..7bfe852
--- /dev/null
+++ b/contact.php
@@ -0,0 +1,57 @@
+<?php
+# This file is part of contact.php.
+
+# contact.php is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# contact.php is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with contact.php.  If not, see <https://www.gnu.org/licenses/>.
+
+# Copyright © 2020 Ludovic Pouzenc <ludovic@pouzenc.fr>
+
+$config['from_email'] = 'www-data@intarnet.fr';
+$config['from_user']  = 'No Reply';
+$config['contact_to'] = 'intarnet@framalistes.org';
+$config['subject_prefix'] = '[contact] ';
+
+
+# Utility fonction to wrap PHP mail() function, with some UTF-8 considerations
+function mail_utf8($to, $subject, $message, $from_email, $from_user, $original_email='', $original_user='')
+{
+    $from_user64     = (iconv('UTF-8', 'ASCII//IGNORE', $from_user    )===$from_user    )?$from_user    :"=?UTF-8?B?".base64_encode($from_user    )."?=";
+    $original_user64 = (iconv('UTF-8', 'ASCII//IGNORE', $original_user)===$original_user)?$original_user:"=?UTF-8?B?".base64_encode($original_user)."?=";
+    $subject64       = (iconv('UTF-8', 'ASCII//IGNORE', $subject      )===$subject      )?$subject      :"=?UTF-8?B?".base64_encode($subject      )."?=";
+    $message70       = wordwrap($message, 70, "\n");
+    $additional_headers =
+        "From: $from_user64 <$from_email>\r\n".
+        ((strlen($original_email)>0)?"Reply-To: $original_user64 <$original_email>\r\n":"").
+        "MIME-Version: 1.0" . "\r\n" .
+        "Content-type: text/plain; charset=UTF-8" . "\r\n";
+    return mail($to, $subject64, $message70, $additional_headers);
+}
+
+# Query parameter checking (assuming form encoding is UTF-8)
+$name = filter_var($_POST['name'], FILTER_SANITIZE_STRING);
+$email = filter_var($_POST['email'], FILTER_SANITIZE_EMAIL);
+$message = filter_var($_POST['message'], FILTER_SANITIZE_STRING);
+$valid_parameters = (strlen($name)>0) && (strlen($email)>0) && (strlen($message)>0) && (strlen($name)<100) && (strlen($email)<100) && (strlen($message)<100000);
+if ($valid_parameters !== TRUE) {
+    echo "Invalid parameters\n";
+    exit();
+}
+
+# Try to actually send an email
+if ( !mail_utf8($config['contact_to'], $config['subject_prefix'] . $name, $message, $config['from_email'], $config['from_user'], $email, $name) ) {
+    echo "Error sending mail\n";
+    exit();
+}
+
+# If we are here, mail has been sent (or queued) successfully
+header('Location: /');