1.4.5_1

[pukiwiki/pukiwiki.git] / plugin / amazon.inc.php

<?php
// PukiWiki - Yet another WikiWikiWeb clone.
// $Id: amazon.inc.php,v 1.14 2005/02/12 03:04:06 henoheno Exp $
// Id: amazon.inc.php,v 1.1 2003/07/24 13:00:00 ´×¼Ë
//
// Amazon plugin: Book-review maker via amazon.com/amazon.jp
//
// Copyright:
//      2004 PukiWiki Developer Team
//      2003 ´×¼Ë <raku@rakunet.org> (Original author)
//
// License: GNU/GPL
//
// ChangeLog:
// * 2004/04/03 PukiWiki Developer Team (arino <arino@users.sourceforge.jp>)
//        - replace plugin_amazon_get_page().
//        - PLUGIN_AMAZON_XML 'xml.amazon.com' -> 'xml.amazon.co.jp'
// * 0.6  URL ¤¬Â¸ºß¤·¤Ê¤¤¾ì¹ç¡¢No image ¤òɽ¼¨¡¢²èÁüÇÛÃ֤ʤɽ¤Àµ¡£
//        ¥¤¥ó¥é¥¤¥ó¥×¥é¥°¥¤¥ó¤Î¸Æ¤Ó½Ð¤·Êý¤ò½¤Àµ¡£
//        ASIN ÈÖ¹æÉôʬ¤ò¥Á¥§¥Ã¥¯¤¹¤ë¡£
//        ²èÁü¡¢¥¿¥¤¥È¥ë¤Î¥­¥ã¥Ã¥·¥å¤Ë¤è¤ë®ÅÙ¤ÎÂçÉý¥¢¥Ã¥×¡£
// * 0.7  ¥Ö¥Ã¥¯¥ì¥Ó¥å¡¼À¸À®¤Î¥Ç¥Ð¥Ã¥°¡¢Ç§¾ÚÌäÂê¤Î°ì±þ¤Î¥¯¥ê¥¢¡£
// * 0.8  amazon Á´¾¦ÉʤβèÁü¤òɽ¼¨¡£
//        ¥¢¥½¥·¥¨¥¤¥È ID ¤ËÂбþ¡£
// * 0.9  RedHat9+php4.3.2+apache2.0.46 ¤Ç²èÁü¤¬ÅÓÃæ¤Þ¤Ç¤·¤«Æɤ߹þ¤Þ¤ì¤Ê¤¤ÌäÂê¤ËÂн衣
//        ÆüËܸì¥Ú¡¼¥¸¤Î²¼¤Ë¥Ö¥Ã¥¯¥ì¥Ó¥å¡¼¤òºî¤í¤¦¤È¤¹¤ë¤Èʸ»ú²½¤±¤·¤Æºî¤ì¤Ê¤¤ÌäÂê¤Î²ò·è¡£
//        ½ñÀҤǤʤ¯ CD ¤Ê¤É¡¢ASIN Éôʬ¤¬Ä¹¤¯¤Æ¤â¥¿¥¤¥È¥ë¤ò¤¦¤Þ¤¯½¦¤¦¤è¤¦¤Ë¤¹¤ë¡£
//        ¼Ì±Æ¤Î¤ß¼è¤ê¹þ¤à¤Î¤Ç¤Ê¤±¤ì¤Ð¡¢B000002G6J.01 ¤È½ñ¤«¤º B000002G6J ¤È½ñ¤¤¤Æ¤â¼Ì±Æ¤¬½Ð¤ë¤è¤¦¤Ë¤¹¤ë¡£
//        ASIN ¤ËÂбþ¤¹¤ë¥­¥ã¥Ã¥·¥å²èÁü/¥­¥ã¥Ã¥·¥å¥¿¥¤¥È¥ë¤ò¤½¤ì¤¾¤ìºï½ü¤¹¤ëµ¡Ç½Äɲá£
//        proxy Âбþ(»î¸³Åª)¡£
//        proxy ¼ÂÁõ¤Î²áÄø¤Ç°ìÈ̥桼¥¶¤Î¤¿¤á¤Î AID ¤Ï¤Ê¤¯¤È¤â¼«Æ°À¸À®¤µ¤ì¤ë¤³¤È¤¬¤ï¤«¤ê¡¢ºï½ü¤·¤¿¡£
// * 1.0  ¥Ö¥Ã¥¯¥ì¥Ó¥å¡¼¤Ç¤Ê¤¯¡¢¥ì¥Ó¥å¡¼¤È¤¹¤ë¡£
//        ²èÁü¤Î¥­¥ã¥Ã¥·¥å¤òºï½ü¤¹¤ë´ü¸Â¤òÀߤ±¤ë¡£
//        ¥¿¥¤¥È¥ë¡¢¼Ì±Æ¤ò Web Services ¤Î XML ¥¢¥¯¥»¥¹¤ÎÊýË¡¤Ë¤è¤Ã¤Æ get ¤¹¤ë¤³¤È¤Ç»þ´Ö¤òû½Ì¤¹¤ë¡£
//        ¥ì¥Ó¥å¡¼¥Ú¡¼¥¸À¸À®¤Î¥¿¥¤¥ß¥ó¥°¤Ë¤Ä¤¤¤ÆÃí¤òÆþ¤ì¤ë¡£
// * 1.1  ÊÔ½¸À©¸Â¤ò¤«¤±¤Æ¤¤¤ë¾ì¹ç¡¢Éô³°¼Ô¤¬¥ì¥Ó¥å¡¼¤òºî¤í¤¦¤È¤·¤Æ¡¢¥Ú¡¼¥¸¤Ï¤Ç¤­¤Ê¤¤¤¬ ASIN4774110655.tit ¤Ê¤É¤Î¥­¥ã¥Ã¥·¥å¤¬¤Ç¤­¤ë¤Î¤ò²ò·è¡£
//        ²èÁü¤ÎºÇ¸å¤¬ 01 ¤Î¾ì¹ç¡¢image ¤òºï½ü¤¹¤ë¤È noimage.jpg ¤È¤Ê¤Ã¤Æ¤·¤Þ¤¦¥Ð¥°¤ò½¤Àµ¡£
//        1.0 ¤ÇƳÆþ¤·¤¿ XML ¥¢¥¯¥»¥¹¤Ï¹â®¤À¤¬¡¢ÊÖ¤¹²èÁü¾ðÊ󤬥¦¥½¤Ê¤Î¤Ç¡¢09 ¤¬¤À¤á¤Ê¤é 01 ¤ò¥È¥é¥¤¤¹¤ë¡¢¤Ç»ÃÄêŪ¤Ë²ò·è¡£
//
// Caution!:
// * Ãøºî¸¢¤¬´ØÏ¢¤¹¤ë°Ù¡¢www.amazon.co.jp ¤Î¥¢¥½¥·¥¨¥¤¥È¥×¥í¥°¥é¥à¤ò³Îǧ¤Î¾å¤´ÍøÍѲ¼¤µ¤¤¡£
// * ¥ì¥Ó¥å¡¼¤Ï¡¢amazon ¥×¥é¥°¥¤¥ó¤¬¸Æ¤Ó½Ð¤¹ÊÔ½¸²èÌ̤Ϥ⤦½ÐÍè¤Æ PukiWiki ¤ËÅÐÏ¿¤µ¤ì¤Æ¤¤¤ë¤Î¤Ç¡¢
//   Ãæ»ß¤¹¤ë¤Ê¤éÁ´Ê¸¤òºï½ü¤·¤Æ¥Ú¡¼¥¸¤Î¹¹¿·¥Ü¥¿¥ó¤ò²¡¤¹¤³¤È¡£
// * ²¼¤Î PLUGIN_AMAZON_AID¡¢PROXY ¥µ¡¼¥Ð¤ÎÉôʬ¡¢expire ¤ÎÉôʬ¤òŬÅö¤ËÊÔ½¸¤·¤Æ»ÈÍѤ·¤Æ¤¯¤À¤µ¤¤(¾¤Ï¤½¤Î¤Þ¤Þ¤Ç¤â Ok)¡£
//
// Thanks to: Reimy and PukiWiki Developers Team
//

/////////////////////////////////////////////////
// Settings

// Amazon associate ID
//define('PLUGIN_AMAZON_AID',''); // None
define('PLUGIN_AMAZON_AID','');

// Expire caches per ? days
define('PLUGIN_AMAZON_EXPIRE_IMAGECACHE',   1);
define('PLUGIN_AMAZON_EXPIRE_TITLECACHE', 356);

// Alternative image for 'Image not found'
define('PLUGIN_AMAZON_NO_IMAGE', IMAGE_DIR . 'noimage.png');

// URI prefixes
switch(LANG){
case 'ja':
        // Amazon shop
        define('PLUGIN_AMAZON_SHOP_URI', 'http://www.amazon.co.jp/exec/obidos/ASIN/');

        // Amazon information inquiry (dev-t = default value in the manual)
        define('PLUGIN_AMAZON_XML', 'http://xml.amazon.co.jp/onca/xml3?t=webservices-20&' .
                'dev-t=GTYDRES564THU&type=lite&page=1&f=xml&locale=jp&AsinSearch=');
        break;
default:
        // Amazon shop
        define('PLUGIN_AMAZON_SHOP_URI', 'http://www.amazon.com/exec/obidos/ASIN/');

        // Amazon information inquiry (dev-t = default value in the manual)
        define('PLUGIN_AMAZON_XML', 'http://xml.amazon.com/onca/xml3?t=webservices-20&' .
                'dev-t=GTYDRES564THU&type=lite&page=1&f=xml&locale=us&AsinSearch=');
        break;
}

/////////////////////////////////////////////////

function plugin_amazon_init()
{
        global $amazon_aid, $amazon_body;

        if (PLUGIN_AMAZON_AID == '') {
                $amazon_aid = '';
        } else {
                $amazon_aid = PLUGIN_AMAZON_AID . '/';
        }
        $amazon_body = <<<EOD
-ºî¼Ô: [[¤³¤³ÊÔ½¸¤Î¤³¤È]]
-ɾ¼Ô: ¤ªÌ¾Á°
-ÆüÉÕ: &date;
**¤ªÁ¦¤áÂоÝ
[[¤³¤³ÊÔ½¸¤Î¤³¤È]]

#amazon(,clear)
**´¶ÁÛ
[[¤³¤³ÊÔ½¸¤Î¤³¤È]]

// ¤Þ¤º¡¢¤³¤Î¥ì¥Ó¥å¡¼¤ò»ß¤á¤ë¾ì¹ç¡¢Á´Ê¸¤òºï½ü¤·¡¢¥Ú¡¼¥¸¤Î[¹¹¿·¥Ü¥¿¥ó]¤ò²¡¤·¤Æ¤¯¤À¤µ¤¤¡ª(PukiWiki ¤Ë¤Ï¤â¤¦ÅÐÏ¿¤µ¤ì¤Æ¤¤¤Þ¤¹)
// ³¤±¤ë¤Ê¤é¡¢¾å¤Î¡¢[[¤³¤³ÊÔ½¸¤Î¤³¤È]]Éôʬ¤ò³ç¸Ì¤ò´Þ¤á¤Æºï½ü¤·¡¢½ñ¤­Ä¾¤·¤Æ¤¯¤À¤µ¤¤¡£
// ¤ªÌ¾Á°¡¢Éôʬ¤Ï¤´¼«Ê¬¤Î̾Á°¤ËÊѹ¹¤·¤Æ¤¯¤À¤µ¤¤¡£»ä¤À¤È¡¢´×¼Ë¡¢¤Ç¤¹¡£
// **¤ªÁ¦¤áÂоݡ¢¤è¤ê¾å¤Ï¡¢¿·¤·¤¤¹Ô¤òÄɲ䷤ʤ¤¤Ç¤¯¤À¤µ¤¤¡£Ìܼ¡ºîÀ®¤Ë»ÈÍѤ¹¤ë¤Î¤Ç¡£
// //¤Ç»Ï¤Þ¤ë¥³¥á¥ó¥È¹Ô¤Ï¡¢ºÇ½ªÅª¤ËÁ´Éô¥«¥Ã¥È¤·¤Æ¤¯¤À¤µ¤¤¡£Ìܼ¡¤¬Àµ¾ï¤ËºîÀ®¤Ç¤­¤Ê¤¤²ÄǽÀ­¤¬¤¢¤ê¤Þ¤¹¡£
#comment
EOD;
}

function plugin_amazon_convert()
{
        global $script, $vars, $asin, $asin_all;

        if (func_num_args() > 3) {
                if (PKWK_READONLY) return ''; // Show nothing

                return '#amazon([ASIN-number][,left|,right]' .
                        '[,book-title|,image|,delimage|,deltitle|,delete])';

        } else if (func_num_args() == 0) {
                // ¥ì¥Ó¥å¡¼ºîÀ®
                if (PKWK_READONLY) return ''; // Show nothing

                $s_page = htmlspecialchars($vars['page']);
                if ($s_page == '') $s_page = isset($vars['refer']) ? $vars['refer'] : '';
                $ret = <<<EOD
<form action="$script" method="post">
 <div>
  <input type="hidden" name="plugin" value="amazon" />
  <input type="hidden" name="refer" value="$s_page" />
  ASIN:
  <input type="text" name="asin" size="30" value="" />
  <input type="submit" value="¥ì¥Ó¥å¡¼ÊÔ½¸" /> (ISBN 10 ·å or ASIN 12 ·å)
 </div>
</form>
EOD;
                return $ret;
        }

        $aryargs = func_get_args();

        $align = strtolower($aryargs[1]);
        if ($align == 'clear') return '<div style="clear:both"></div>'; // ²þ¹ÔÁÞÆþ
        if ($align != 'left') $align = 'right'; // ÇÛÃÖ·èÄê

        $asin_all = htmlspecialchars($aryargs[0]);  // for XSS
        if (is_asin() == FALSE && $align != 'clear') return FALSE;

        if ($aryargs[2] != '') {
                // ¥¿¥¤¥È¥ë»ØÄê
                $title = $alt = htmlspecialchars($aryargs[2]); // for XSS
                if ($alt == 'image') {
                        $alt = plugin_amazon_get_asin_title();
                        if ($alt == '') return FALSE;
                        $title = '';
                } else if ($alt == 'delimage') {
                        if (unlink(CACHE_DIR . 'ASIN' . $asin . '.jpg')) {
                                return 'Image of ' . $asin . ' deleted...';
                        } else {
                                return 'Image of ' . $asin . ' NOT DELETED...';
                        }
                } elseif ($alt == 'deltitle') {
                        if (unlink(CACHE_DIR . 'ASIN' . $asin . '.tit')) {
                                return 'Title of ' . $asin . ' deleted...';
                        } else {
                                return 'Title of ' . $asin . ' NOT DELETED...';
                        }
                } elseif ($alt == 'delete') {
                        if ((unlink(CACHE_DIR . 'ASIN' . $asin . '.jpg') &&
                             unlink(CACHE_DIR . 'ASIN' . $asin . '.tit'))) {
                                return 'Title and Image of ' . $asin . ' deleted...';
                        } else {
                                return 'Title and Image of ' . $asin . ' NOT DELETED...';
                        }
                }
        } else {
                // ¥¿¥¤¥È¥ë¼«Æ°¼èÆÀ
                $alt = $title = plugin_amazon_get_asin_title();
                if ($alt == '') return FALSE;
        }

        return plugin_amazon_print_object($align, $alt, $title);
}

function plugin_amazon_action()
{
        global $vars, $script, $edit_auth, $edit_auth_users;
        global $amazon_body, $asin, $asin_all;

        if (PKWK_READONLY) die_message('PKWK_READONLY prohibits editing');

        $s_page   = isset($vars['refer']) ? $vars['refer'] : '';
        $asin_all = isset($vars['asin']) ?
                htmlspecialchars(rawurlencode(strip_bracket($vars['asin']))) : '';

        if (! is_asin()) {
                $retvars['msg']   = '¥Ö¥Ã¥¯¥ì¥Ó¥å¡¼ÊÔ½¸';
                $retvars['refer'] = & $s_page;
                $retvars['body']  = plugin_amazon_convert();
                return $retvars;

        } else {
                $r_page     = $s_page . '/' . $asin;
                $r_page_url = rawurlencode($r_page);
                $auth_user = isset($_SERVER['PHP_AUTH_USER']) ? $_SERVER['PHP_AUTH_USER'] : '';

                pkwk_headers_sent();
                if ($edit_auth && ($auth_user == '' || ! isset($edit_auth_users[$auth_user]) ||
                    $edit_auth_users[$auth_user] != $_SERVER['PHP_AUTH_PW'])) {
                        // Edit-auth failed. Just look the page
                        header('Location: ' . get_script_uri() . '?' . $r_page_url);
                } else {
                        $title = plugin_amazon_get_asin_title();
                        if ($title == '' || preg_match('#^/#', $s_page)) {
                                // Invalid page name
                                header('Location: ' . get_script_uri() . '?' . rawurlencode($s_page));
                        } else {
                                $body = '#amazon(' . $asin_all . ',,image)' . "\n" .
                                        '*' . $title . "\n" . $amazon_body;
                                plugin_amazon_review_save($r_page, $body);
                                header('Location: ' . get_script_uri() .
                                        '?cmd=edit&page=' . $r_page_url);
                        }
                }
                exit;
        }
}

function plugin_amazon_inline()
{
        global $amazon_aid, $asin, $asin_all;

        list($asin_all) = func_get_args();

        $asin_all = htmlspecialchars($asin_all); // for XSS
        if (! is_asin()) return FALSE;

        $title = plugin_amazon_get_asin_title();
        if ($title == '') {
                return FALSE;
        } else {
                return '<a href="' . PLUGIN_AMAZON_SHOP_URI .
                        $asin . '/' . $amazon_aid . 'ref=nosim">' . $title . '</a>' . "\n";
        }
}

function plugin_amazon_print_object($align, $alt, $title)
{
        global $amazon_aid;
        global $asin, $asin_ext, $asin_all;

        $url      = plugin_amazon_cache_image_fetch(CACHE_DIR);
        $url_shop = PLUGIN_AMAZON_SHOP_URI . $asin . '/' . $amazon_aid . 'ref=nosim';
        $center   = 'text-align:center';

        if ($title == '') {
                // Show image only
                $div  = '<div style="float:' . $align . ';margin:16px 16px 16px 16px;' . $center . '">' . "\n";
                $div .= ' <a href="' . $url_shop . '"><img src="' . $url . '" alt="' . $alt . '" /></a>' . "\n";
                $div .= '</div>' . "\n";

        } else {
                // Show image and title
                $div  = '<div style="float:' . $align . ';padding:.5em 1.5em .5em 1.5em;' . $center . '">' . "\n";
                $div .= ' <table style="width:110px;border:0;' . $center . '">' . "\n";
                $div .= '  <tr><td style="' . $center . '">' . "\n";
                $div .= '   <a href="' . $url_shop . '"><img src="' . $url . '" alt="' . $alt  .'" /></a></td></tr>' . "\n";
                $div .= '  <tr><td style="' . $center . '"><a href="' . $url_shop . '">' . $title . '</a></td></tr>' . "\n";
                $div .= ' </table>' . "\n";
                $div .= '</div>' . "\n";
        }
        return $div;
}

function plugin_amazon_get_asin_title()
{
        global $asin, $asin_ext, $asin_all;

        if ($asin_all == '') return '';

        $nocache = $nocachable = 0;

        $url = PLUGIN_AMAZON_XML . $asin;

        if (file_exists(CACHE_DIR) === FALSE || is_writable(CACHE_DIR) === FALSE) $nocachable = 1; // ¥­¥ã¥Ã¥·¥åÉԲĤξì¹ç

        if (($title = plugin_amazon_cache_title_fetch(CACHE_DIR)) == FALSE) {
                $nocache = 1; // ¥­¥ã¥Ã¥·¥å¸«¤Ä¤«¤é¤º
                $body    = plugin_amazon_get_page($url); // ¤·¤«¤¿¤Ê¤¤¤Î¤Ç¼è¤ê¤Ë¤¤¤¯
                $tmpary  = array();
                $body    = mb_convert_encoding($body, SOURCE_ENCODING, 'UTF-8');
                preg_match('/<ProductName>([^<]*)</', $body, $tmpary);
                $title     = trim($tmpary[1]);
//              $tmpary[1] = '';
//              preg_match('#<ImageUrlMedium>http://images-jp.amazon.com/images/P/[^.]+\.(..)\.#',
//                      $body, $tmpary);
//              if ($tmpary[1] != '') {
//                      $asin_ext = $tmpary[1];
//                      $asin_all = $asin . $asin_ext;
//              }
        }

        if ($title == '') {
                return '';
        } else {
                if ($nocache == 1 && $nocachable != 1)
                        plugin_amazon_cache_title_save($title, CACHE_DIR);
                return $title;
        }
}

// ¥¿¥¤¥È¥ë¥­¥ã¥Ã¥·¥å¤¬¤¢¤ë¤«Ä´¤Ù¤ë
function plugin_amazon_cache_title_fetch($dir)
{
        global $asin, $asin_ext, $asin_all;

        $filename = $dir . 'ASIN' . $asin . '.tit';

        $get_tit = 0;
        if (! is_readable($filename)) {
                $get_tit = 1;
        } elseif (PLUGIN_AMAZON_EXPIRE_TITLECACHE * 3600 * 24 < time() - filemtime($filename)) {
                $get_tit = 1;
        }

        if ($get_tit) return FALSE;

        if (($fp = @fopen($filename, 'r')) === FALSE) return FALSE;
        $title = fgets($fp, 4096);
//      $tmp_ext = fgets($fp, 4096);
//      if ($tmp_ext != '') $asin_ext = $tmp_ext;
        fclose($fp);

        if (strlen($title) > 0) {
                return $title;
        } else {
                return FALSE;
        }
}

// ²èÁü¥­¥ã¥Ã¥·¥å¤¬¤¢¤ë¤«Ä´¤Ù¤ë
function plugin_amazon_cache_image_fetch($dir)
{
        global $asin, $asin_ext, $asin_all;

        $filename = $dir . 'ASIN' . $asin . '.jpg';

        $get_img = 0;
        if (! is_readable($filename)) {
                $get_img = 1;
        } elseif (PLUGIN_AMAZON_EXPIRE_IMAGECACHE * 3600 * 24 < time() - filemtime($filename)) {
                $get_img = 1;
        }

        if ($get_img) {
                $url = 'http://images-jp.amazon.com/images/P/' . $asin . '.' . $asin_ext . '.MZZZZZZZ.jpg';
                if (! is_url($url)) return FALSE;

                $body = plugin_amazon_get_page($url);
                if ($body != '') {
                        $tmpfile = $dir . 'ASIN' . $asin . '.jpg.0';
                        $fp = fopen($tmpfile, 'wb');
                        fwrite($fp, $body);
                        fclose($fp);
                        $size = getimagesize($tmpfile);
                        unlink($tmpfile);
                }
                if ($body == '' || $size[1] <= 1) { // Ä̾ï¤Ï1¤¬Ê֤뤬ǰ¤Î¤¿¤á0¤Î¾ì¹ç¤â(reimy)
                        // ¥­¥ã¥Ã¥·¥å¤ò PLUGIN_AMAZON_NO_IMAGE ¤Î¥³¥Ô¡¼¤È¤¹¤ë
                        if ($asin_ext == '09') {
                                $url = 'http://images-jp.amazon.com/images/P/' . $asin . '.01.MZZZZZZZ.jpg';
                                $body = plugin_amazon_get_page($url);
                                if ($body != '') {
                                        $tmpfile = $dir . 'ASIN' . $asin . '.jpg.0';
                                        $fp = fopen($tmpfile, 'wb');
                                        fwrite($fp, $body);
                                        fclose($fp);
                                        $size = getimagesize($tmpfile);
                                        unlink($tmpfile);
                                }
                        }
                        if ($body == '' || $size[1] <= 1) {
                                $fp = fopen(PLUGIN_AMAZON_NO_IMAGE, 'rb');
                                if (! $fp) return FALSE;
                                
                                $body = '';
                                while (! feof($fp)) $body .= fread($fp, 4096);
                                fclose ($fp);
                        }
                }
                plugin_amazon_cache_image_save($body, CACHE_DIR);
        }
        return $filename;
}

// Save title cache
function plugin_amazon_cache_title_save($data, $dir)
{
        global $asin, $asin_ext, $asin_all;

        $filename = $dir . 'ASIN' . $asin . '.tit';
        $fp = fopen($filename, 'w');
        fwrite($fp, $data);
        fclose($fp);

        return $filename;
}

// Save image cache
function plugin_amazon_cache_image_save($data, $dir)
{
        global $asin, $asin_ext, $asin_all;

        $filename = $dir . 'ASIN' . $asin . '.jpg';
        $fp = fopen($filename, 'wb');
        fwrite($fp, $data);
        fclose($fp);

        return $filename;
}

// Save book data
function plugin_amazon_review_save($page, $data)
{
        global $asin, $asin_ext, $asin_all;

        $filename = DATA_DIR . encode($page) . '.txt';
        if (! is_readable($filename)) {
                $fp = fopen($filename, 'w');
                fwrite($fp, $data);
                fclose($fp);
                return TRUE;
        } else {
                return FALSE;
        }
}

function plugin_amazon_get_page($url)
{
        $data = http_request($url);
        return ($data['rc'] == 200) ? $data['data'] : '';
}

// is ASIN?
function is_asin()
{
        global $asin, $asin_ext, $asin_all;

        $tmpary = array();
        if (preg_match('/^([A-Z0-9]{10}).?([0-9][0-9])?$/', $asin_all, $tmpary) == FALSE) {
                return FALSE;
        } else {
                $asin     = $tmpary[1];
                $asin_ext = isset($tmpary[2]) ? $tmpary[2] : '';
                if ($asin_ext == '') $asin_ext = '09';
                $asin_all = $asin . $asin_ext;
                return TRUE;
        }
}
?>