Anleitung: Captcha als eingebettetes Base64-Bild

[hpzeller]

Hallo Community

Da es immer wieder Probleme mit dem laden des Captcha’s via ‘display_vvcodes.php’ gibt habe ich eine kleine Umbauanleitung geschrieben, mit der das Captcha hart codiert als eingebettetes Base64-Bild der Seite vor dessen Auslieferung übergeben wird.

Die folgende Anleitung richtet sich an diejenigen Shopbetreiber die Probleme mit dem Captcha haben, es aber trotzdem beibehalten möchten, wer aber auf das Captcha verzichten möchte, dem empfehle ich das MODUL: Kontaktformular mit neuem Spamschutz ohne Captcha von GTB.

In den Dateien ‘inc/xtc_render_vvcode.inc.php’, ‘includes/contact_us.php’, ‘newsletter.php’ ab und ‘password_double_opt.php’ sind folgende Änderungen vorzunehmen.

In inc/xtc_render_vvcode.inc.php ab ca. Zeile 98

Code: PHP  [Auswählen]

    header('Content-Type: image/jpeg');
    imagejpeg($imgh);
    imagedestroy($imgh);
 

ersetzen mit

Code: PHP  [Auswählen]

    // BOF - hpzeller - 2015-01-21 - change xtc_href_link -> base64 encoded image
    // header('Content-Type: image/jpeg');
    // imagejpeg($imgh);
    // imagedestroy($imgh);
    imagejpeg($imgh, DIR_WS_IMAGES . 'captcha_tmp.jpeg');
    imagedestroy($imgh);  
    $img_data = base64_encode(file_get_contents(DIR_WS_IMAGES . 'captcha_tmp.jpeg'));  
    @unlink(DIR_WS_IMAGES . 'captcha_tmp.jpeg');
    return  'data:image/jpeg;base64,' . $img_data;
    // EOF - hpzeller - 2015-01-21 - change xtc_href_link -> base64 encoded image
 

In includes/contact_us.php ab ca. Zeile 182

Code: PHP  [Auswählen]

    //BOF - web28 - 2009-07-28 - FIX SSL captcha image path
    $smarty->assign('VVIMG', '<img src="'.xtc_href_link(FILENAME_DISPLAY_VVCODES,'','SSL').'" alt="Captcha" />');
    //EOF - web28 - 2009-07-28 - FIX SSL captcha image path
 

ersetzen mit

Code: PHP  [Auswählen]

    //BOF - hpzeller - 2015-01-21 - change xtc_href_link -> base64 encoded image    
    //BOF - web28 - 2009-07-28 - FIX SSL captcha image path
    //$smarty->assign('VVIMG', '<img src="'.xtc_href_link(FILENAME_DISPLAY_VVCODES,'','SSL').'" alt="Captcha" />');
    //EOF - web28 - 2009-07-28 - FIX SSL captcha image path
    require_once (DIR_FS_INC.'xtc_render_vvcode.inc.php');
    require_once (DIR_FS_INC.'xtc_random_charcode.inc.php');    
    $smarty->assign('VVIMG', '<img src="'.vvcode_render_code($_SESSION['vvcode'] = xtc_random_charcode(6)).'" alt="Captcha" />');
    //EOF - hpzeller - 2015-01-21 - change xtc_href_link -> base64 encoded image

 

In newsletter.php ab ca. Zeile 195

Code: PHP  [Auswählen]

//BOF - Dokuman - 2009-11-02 - Fix lost session on newsletter subscription
//$smarty->assign('VVIMG', '<img src="'.DIR_WS_CATALOG.FILENAME_DISPLAY_VVCODES.'" alt="Captcha" />');
$smarty->assign('VVIMG', '<img src="'.xtc_href_link(FILENAME_DISPLAY_VVCODES, 't='. time(), 'SSL') .'" alt="Captcha" />'); // web28 - 2010-09-21 - change NONSSL -> SSL
//EOF - Dokuman - 2009-11-02 - Fix lost session on newsletter subscription
 

ersetzen mit

Code: PHP  [Auswählen]

// BOF - hpzeller - 2015-01-21 - change xtc_href_link -> base64 encoded image
// BOF - Dokuman - 2009-11-02 - Fix lost session on newsletter subscription
// $smarty->assign('VVIMG', '<img src="'.DIR_WS_CATALOG.FILENAME_DISPLAY_VVCODES.'" alt="Captcha" />');
// $smarty->assign('VVIMG', '<img src="'.vvcode_render_code($_SESSION['vvcode'] = xtc_random_charcode(6)).'" alt="Captcha" />'); // web28 - 2010-09-21 - change NONSSL -> SSL
$smarty->assign('VVIMG', '<img src="'.vvcode_render_code($_SESSION['vvcode'] = xtc_random_charcode(6)).'" alt="Captcha" />'); // hpzeller - 2015-01-21 - change xtc_href_link -> base64 encoded image  
// EOF - Dokuman - 2009-11-02 - Fix lost session on newsletter subscription
// EOF - hpzeller - 2015-01-21 - change xtc_href_link -> base64 encoded image
 

In password_double_opt.php ab ca. Zeile 137

Code: PHP  [Auswählen]

    //BOF - Dokuman - 2009-08-13: fix not displaying Captcha on SSL(Proxy) connections
    //$smarty->assign('VVIMG', '<img src="'.xtc_href_link(FILENAME_DISPLAY_VVCODES).'" alt="Captcha" />');
    $smarty->assign('VVIMG', '<img src="'.xtc_href_link(FILENAME_DISPLAY_VVCODES, '', 'SSL').'" alt="Captcha" />');
    //EOF - Dokuman - 2009-08-13: fix not displaying Captcha on SSL(Proxy) connections
 

ersetzen mit

Code: PHP  [Auswählen]

    //BOF - Dokuman - 2009-08-13: fix not displaying Captcha on SSL(Proxy) connections
    //$smarty->assign('VVIMG', '<img src="'.xtc_href_link(FILENAME_DISPLAY_VVCODES).'" alt="Captcha" />');
    //$smarty->assign('VVIMG', '<img src="'.xtc_href_link(FILENAME_DISPLAY_VVCODES, '', 'SSL').'" alt="Captcha" />');
    $smarty->assign('VVIMG', '<img src="'.vvcode_render_code($_SESSION['vvcode'] = xtc_random_charcode(6)).'" alt="Captcha" />'); // hpzeller - 2015-01-21 - change xtc_href_link -> base64 encoded image
    //EOF - Dokuman - 2009-08-13: fix not displaying Captcha on SSL(Proxy) connections
 

In password_double_opt.php ab ca. Zeile 160

Code: PHP  [Auswählen]

    //BOF - Dokuman - 2009-08-13: fix not displaying Captcha on SSL(Proxy) connections
    //$smarty->assign('VVIMG', '<img src="'.xtc_href_link(FILENAME_DISPLAY_VVCODES).'" alt="Captcha" />');
    $smarty->assign('VVIMG', '<img src="'.xtc_href_link(FILENAME_DISPLAY_VVCODES, '', 'SSL').'" alt="Captcha" />');
    //EOF - Dokuman - 2009-08-13: fix not displaying Captcha on SSL(Proxy) connections
 

ersetzen mit

Code: PHP  [Auswählen]

    //BOF - Dokuman - 2009-08-13: fix not displaying Captcha on SSL(Proxy) connections
    //$smarty->assign('VVIMG', '<img src="'.xtc_href_link(FILENAME_DISPLAY_VVCODES).'" alt="Captcha" />');
    //$smarty->assign('VVIMG', '<img src="'.xtc_href_link(FILENAME_DISPLAY_VVCODES, '', 'SSL').'" alt="Captcha" />');
    $smarty->assign('VVIMG', '<img src="'.vvcode_render_code($_SESSION['vvcode'] = xtc_random_charcode(6)).'" alt="Captcha" />'); // hpzeller - 2015-01-21 - change xtc_href_link -> base64 encoded image
    //EOF - Dokuman - 2009-08-13: fix not displaying Captcha on SSL(Proxy) connections
 

In password_double_opt.php ab ca. Zeile 191

Code: PHP  [Auswählen]

    //BOF - Dokuman - 2009-08-13: fix not displaying Captcha on SSL(Proxy) connections
    //$smarty->assign('VVIMG', '<img src="'.xtc_href_link(FILENAME_DISPLAY_VVCODES).'" alt="Captcha" />');
    $smarty->assign('VVIMG', '<img src="'.xtc_href_link(FILENAME_DISPLAY_VVCODES, '', 'SSL').'" alt="Captcha" />');
    //EOF - Dokuman - 2009-08-13: fix not displaying Captcha on SSL(Proxy) connections
 

ersetzen mit

Code: PHP  [Auswählen]

    //BOF - Dokuman - 2009-08-13: fix not displaying Captcha on SSL(Proxy) connections
    //$smarty->assign('VVIMG', '<img src="'.xtc_href_link(FILENAME_DISPLAY_VVCODES).'" alt="Captcha" />');
    //$smarty->assign('VVIMG', '<img src="'.xtc_href_link(FILENAME_DISPLAY_VVCODES, '', 'SSL').'" alt="Captcha" />');
    $smarty->assign('VVIMG', '<img src="'.vvcode_render_code($_SESSION['vvcode'] = xtc_random_charcode(6)).'" alt="Captcha" />'); // hpzeller - 2015-01-21 - change xtc_href_link -> base64 encoded image
    //EOF - Dokuman - 2009-08-13: fix not displaying Captcha on SSL(Proxy) connections
 

Ende!

Gruss
Hanspeter

Linkback: https://www.modified-shop.org/forum/index.php?topic=32043.0

[jannemann]

Hallo Hanspeter,

herzlichen Dank fürs Teilen deiner Lösung

 

Das können sicher viele User gebrauchen.

Schöne Grüße,
Jan