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<title>[38058] trunk: Mail: Improve handling of UTF-8 address headers.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/38058">38058</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/38058","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>boonebgorges</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2016-07-13 18:03:52 +0000 (Wed, 13 Jul 2016)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Mail: Improve handling of UTF-8 address headers.

Previously, `wp_mail()` implemented Reply-To as a generic header, using
PHPMailer's `addCustomHeader()`. As such, the email address portion of
the header was being incorrectly encoded when the name portion
contained UTF-8 characters. Switching to PHPMailer's more specific
`addReplyTo()` method fixes the issue.

For greater readability, the handling of all address-related headers
(To, CC, BCC, Reply-To) has been standardized.

Props szepe.viktor, iandunn, bpetty, stephenharris.
Fixes <a href="https://core.trac.wordpress.org/ticket/21659">#21659</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludespluggablephp">trunk/src/wp-includes/pluggable.php</a></li>
<li><a href="#trunktestsphpunitincludesmockmailerphp">trunk/tests/phpunit/includes/mock-mailer.php</a></li>
<li><a href="#trunktestsphpunittestsmailphp">trunk/tests/phpunit/tests/mail.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludespluggablephp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/pluggable.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/pluggable.php       2016-07-13 17:31:15 UTC (rev 38057)
+++ trunk/src/wp-includes/pluggable.php 2016-07-13 18:03:52 UTC (rev 38058)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -216,6 +216,8 @@
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        // Headers
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+        $cc = $bcc = $reply_to = array();
+
</ins><span class="cx" style="display: block; padding: 0 10px">         if ( empty( $headers ) ) {
</span><span class="cx" style="display: block; padding: 0 10px">                $headers = array();
</span><span class="cx" style="display: block; padding: 0 10px">        } else {
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -227,8 +229,6 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        $tempheaders = $headers;
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px">                $headers = array();
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                $cc = array();
-               $bcc = array();
</del><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                // If it's actually got contents
</span><span class="cx" style="display: block; padding: 0 10px">                if ( !empty( $tempheaders ) ) {
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -291,6 +291,9 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                        case 'bcc':
</span><span class="cx" style="display: block; padding: 0 10px">                                                $bcc = array_merge( (array) $bcc, explode( ',', $content ) );
</span><span class="cx" style="display: block; padding: 0 10px">                                                break;
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                        case 'reply-to':
+                                               $reply_to = array_merge( (array) $reply_to, explode( ',', $content ) );
+                                               break;
</ins><span class="cx" style="display: block; padding: 0 10px">                                         default:
</span><span class="cx" style="display: block; padding: 0 10px">                                                // Add it to our grand headers array
</span><span class="cx" style="display: block; padding: 0 10px">                                                $headers[trim( $name )] = trim( $content );
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -335,7 +338,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><span class="cx" style="display: block; padding: 0 10px">         * @param string $from_email Email address to send from.
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        $phpmailer->From = apply_filters( 'wp_mail_from', $from_email );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $from_email = apply_filters( 'wp_mail_from', $from_email );
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        /**
</span><span class="cx" style="display: block; padding: 0 10px">         * Filters the name to associate with the "from" email address.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -344,63 +347,52 @@
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><span class="cx" style="display: block; padding: 0 10px">         * @param string $from_name Name associated with the "from" email address.
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        $phpmailer->FromName = apply_filters( 'wp_mail_from_name', $from_name );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $from_name = apply_filters( 'wp_mail_from_name', $from_name );
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+        $phpmailer->setFrom( $from_email, $from_name );
+
</ins><span class="cx" style="display: block; padding: 0 10px">         // Set destination addresses
</span><span class="cx" style="display: block; padding: 0 10px">        if ( !is_array( $to ) )
</span><span class="cx" style="display: block; padding: 0 10px">                $to = explode( ',', $to );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        foreach ( (array) $to as $recipient ) {
-               try {
-                       // Break $recipient into name and address parts if in the format "Foo <bar@baz.com>"
-                       $recipient_name = '';
-                       if ( preg_match( '/(.*)<(.+)>/', $recipient, $matches ) ) {
-                               if ( count( $matches ) == 3 ) {
-                                       $recipient_name = $matches[1];
-                                       $recipient = $matches[2];
-                               }
-                       }
-                       $phpmailer->AddAddress( $recipient, $recipient_name);
-               } catch ( phpmailerException $e ) {
-                       continue;
-               }
-       }
-
</del><span class="cx" style="display: block; padding: 0 10px">         // Set mail's subject and body
</span><span class="cx" style="display: block; padding: 0 10px">        $phpmailer->Subject = $subject;
</span><span class="cx" style="display: block; padding: 0 10px">        $phpmailer->Body    = $message;
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        // Add any CC and BCC recipients
-       if ( !empty( $cc ) ) {
-               foreach ( (array) $cc as $recipient ) {
-                       try {
-                               // Break $recipient into name and address parts if in the format "Foo <bar@baz.com>"
-                               $recipient_name = '';
-                               if ( preg_match( '/(.*)<(.+)>/', $recipient, $matches ) ) {
-                                       if ( count( $matches ) == 3 ) {
-                                               $recipient_name = $matches[1];
-                                               $recipient = $matches[2];
-                                       }
-                               }
-                               $phpmailer->AddCc( $recipient, $recipient_name );
-                       } catch ( phpmailerException $e ) {
-                               continue;
-                       }
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // Use appropriate methods for handling addresses, rather than treating them as generic headers
+       $address_headers = compact( 'to', 'cc', 'bcc', 'reply_to' );
+
+       foreach ( $address_headers as $address_header => $addresses ) {
+               if ( empty( $addresses ) ) {
+                       continue;
</ins><span class="cx" style="display: block; padding: 0 10px">                 }
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        }
</del><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        if ( !empty( $bcc ) ) {
-               foreach ( (array) $bcc as $recipient) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         foreach ( (array) $addresses as $address ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                         try {
</span><span class="cx" style="display: block; padding: 0 10px">                                // Break $recipient into name and address parts if in the format "Foo <bar@baz.com>"
</span><span class="cx" style="display: block; padding: 0 10px">                                $recipient_name = '';
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                if ( preg_match( '/(.*)<(.+)>/', $recipient, $matches ) ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+                               if ( preg_match( '/(.*)<(.+)>/', $address, $matches ) ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                                         if ( count( $matches ) == 3 ) {
</span><span class="cx" style="display: block; padding: 0 10px">                                                $recipient_name = $matches[1];
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                                $recipient = $matches[2];
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                         $address        = $matches[2];
</ins><span class="cx" style="display: block; padding: 0 10px">                                         }
</span><span class="cx" style="display: block; padding: 0 10px">                                }
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                $phpmailer->AddBcc( $recipient, $recipient_name );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+                               switch ( $address_header ) {
+                                       case 'to':
+                                               $phpmailer->addAddress( $address, $recipient_name );
+                                               break;
+                                       case 'cc':
+                                               $phpmailer->addCc( $address, $recipient_name );
+                                               break;
+                                       case 'bcc':
+                                               $phpmailer->addBcc( $address, $recipient_name );
+                                               break;
+                                       case 'reply_to':
+                                               $phpmailer->addReplyTo( $address, $recipient_name );
+                                               break;
+                               }
</ins><span class="cx" style="display: block; padding: 0 10px">                         } catch ( phpmailerException $e ) {
</span><span class="cx" style="display: block; padding: 0 10px">                                continue;
</span><span class="cx" style="display: block; padding: 0 10px">                        }
</span></span></pre></div>
<a id="trunktestsphpunitincludesmockmailerphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/includes/mock-mailer.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/includes/mock-mailer.php      2016-07-13 17:31:15 UTC (rev 38057)
+++ trunk/tests/phpunit/includes/mock-mailer.php        2016-07-13 18:03:52 UTC (rev 38058)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -17,7 +17,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        'to'      => $this->to,
</span><span class="cx" style="display: block; padding: 0 10px">                        'cc'      => $this->cc,
</span><span class="cx" style="display: block; padding: 0 10px">                        'bcc'     => $this->bcc,
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        'header'  => $this->MIMEHeader,
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 'header'  => $this->MIMEHeader . $this->mailHeader,
</ins><span class="cx" style="display: block; padding: 0 10px">                         'subject' => $this->Subject,
</span><span class="cx" style="display: block; padding: 0 10px">                        'body'    => $this->MIMEBody,
</span><span class="cx" style="display: block; padding: 0 10px">                );
</span></span></pre></div>
<a id="trunktestsphpunittestsmailphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/tests/mail.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/mail.php        2016-07-13 17:31:15 UTC (rev 38057)
+++ trunk/tests/phpunit/tests/mail.php  2016-07-13 18:03:52 UTC (rev 38058)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -307,4 +307,39 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertNotContains( 'quoted-printable', $GLOBALS['phpmailer']->mock_sent[0]['header'] );
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+       /**
+        * @ticket 21659
+        */
+       public function test_wp_mail_addresses_arent_encoded() {
+               $to      = 'Lukáš To <to@example.org>';
+               $subject = 'Testing #21659';
+               $message = 'Only the name should be encoded, not the address.';
+
+               $headers = array(
+                       'From'     => 'From: Lukáš From <from@example.org>',
+                       'Cc'       => 'Cc: Lukáš CC <cc@example.org>',
+                       'Bcc'      => 'Bcc: Lukáš BCC <bcc@example.org>',
+                       'Reply-To' => 'Reply-To: Lukáš Reply-To <reply_to@example.org>',
+               );
+
+               $expected = array(
+                       'To'       => 'To: =?UTF-8?B?THVrw6HFoSBUbw==?= <to@example.org>',
+                       'From'     => 'From: =?UTF-8?Q?Luk=C3=A1=C5=A1_From?= <from@example.org>',
+                       'Cc'       => 'Cc: =?UTF-8?B?THVrw6HFoSBDQw==?= <cc@example.org>',
+                       'Bcc'      => 'Bcc: =?UTF-8?B?THVrw6HFoSBCQ0M=?= <bcc@example.org>',
+                       'Reply-To' => 'Reply-To: =?UTF-8?Q?Luk=C3=A1=C5=A1_Reply-To?= <reply_to@example.org>',
+               );
+
+               wp_mail( $to, $subject, $message, array_values( $headers ) );
+
+               $mailer        = tests_retrieve_phpmailer_instance();
+               $sent_headers  = preg_split( "/\r\n|\n|\r/", $mailer->get_sent()->header );
+               $headers['To'] = "To: $to";
+
+               foreach ( $headers as $header => $value ) {
+                       $target_headers = preg_grep( "/^$header:/", $sent_headers );
+                       $this->assertEquals( $expected[ $header ], array_pop( $target_headers ) );
+               }
+       }
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span></span></pre>
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