一年一度的蘋果新品剛發佈後的幾天，9月12號就正式上市了，按照慣例，果農們又得在網上拼個你死我活了，香港蘋果店在12號下午3點後正式開放購買，還沒來得及寫好腳本，經過不斷的按F5和enter，不懈努力之下，搶到了1臺!
搶收過後，特意寫下這個腳本，監控蘋果網上商店是否有貨，有貨第一時間發出郵件通知我
，網上有類似的訂閱服務，留個郵件地址也能收到相關的提醒，也有chrom或者firefox的插件能夠在瀏覽器定時監控，有貨第一時間發出窗口通知或者播放警告聲。
此類服務的原理大多使用同一原理，就是發送get請求，獲取蘋果服務器的迴應json字符串，判斷裏面的值,比如這次有isBuyable:true/false.獲取方法有很多，比如我這次寫的php，運行在服務器端，也能用javascript寫，在瀏覽器定時運行，也能做成瀏覽器插件，接收來自服務器的返回信息並根據對應的迴應進行相關的觸發提醒。
至於怎麼獲取或者怎麼知道蘋果服務器的get url，有開發經驗的童鞋肯定用過firefox 的firebug, 打開http://store.apple.com/hk-zh/buy-iphone/iphone6/ 購買的網頁後，打開firebug，然後按照正常購買的流程，比如選擇"iphone 6 plus"->"金色"->"64GB",留意這些選項都選中之後，在firebug的網絡模塊裏可以看到瀏覽器發出了"http://store.apple.com/hk-zh/buyFlowSelectionSummary/IPHONE6P?node=home/shop_iphone/family/iphone6&step=select&option.dimensionScreensize=5_5inch&option.dimensionColor=gold&option.dimensionCapacity=128gb&option.carrierModel=UNLOCKED%2FWW&carrierPolicyType=UNLOCKED" 這樣的請求，然後打開該請求的響應信息，內容很長，基本如下：
{"head":{"status":"200","data":{}},
"body":{"content":{"pageURL":"5.5-吋螢幕-128gb-金色-已解鎖",
"selected":{"productImage":"<img src=\"http://store.storep_w_picpaths.cdn-apple.com/7872/as-p_w_picpaths.apple.com/is/p_w_picpath/AppleInc/aos/published/p_w_picpaths/i/ph/iphone6p/gold/iphone6p-gold-select-2014_GEO_HK_LANG_ZH?wid=110&hei=78&fmt=jpeg&qlt=95&op_sharpen=0&resMode=bicub&op_usm=0.5,1.5,0,0&iccEmbed=0&layer=comp&.v=1410265171755\" alt=\"\" width=\"110\" height=\"78\" data-scale-params-2=\"wid=220&hei=156&fmt=jpeg&qlt=95&op_sharpen=0&resMode=bicub&op_usm=0.5,1.5,0,0&iccEmbed=0&layer=comp&.v=1410265171755\" itemprop=\"p_w_picpath\"/>",
"productTitle":"iPhone 6 Plus 128GB 金色 已解鎖",
"purchaseOptions":{"financing":"\n\n\n\n\n\n",
"promotions":"\n\n<span class=\"gift-card\">\n\n</span>\n",
"shippingPrice":"\n<span class=\"freeshipping promo-text\">免費運送</span>",
"shippingLead":"\n預計出貨時間<b>:</b><br/>\n<span class=\"customer_commit_display\">暫時無法提供</span>\n\n",
"price":"\n<span class=\"current_price\">\n<span itemscope=\"itemscope\" itemprop=\"offers\" itemtype=\"http://schema.org/Offer\">\n\n<meta itemprop=\"priceCurrency\" content=\"HKD\"/>\n<span itemprop=\"price\">\nHK$8,088\n</span>\n</span>\n</span>\n\n\n",
"isBuyable":false},
"partNumber":"MGAF2ZP/A"},
"pageTitle":"iPhone 6 Plus 128GB 金色 已解鎖 - Apple Store (香港)"}}}返回的json裏面，包含了isBuyable的參數，估計蘋果就是利用這個響應來判斷是否有存貨，並且來控制頁面的操作。
知道這個原理後，就可以着手寫腳本了，主要是用curl的api來發送請求，將返回的json轉換爲array，並判斷該字段的值，false爲無貨，true爲有貨，代碼已完成，摘錄如下：
<?php $recipient="[email protected],[email protected],[email protected]"; $from="From: [email protected]\r\n"; $subject="iPhone6 available"; $headers = $from."Content-type: text/html\r\n"; $user_agent="Mozilla/5.0 (Windows NT 6.1; rv:32.0) Gecko/20100101 Firefox/32.0"; $iphone6=array( 0=>array('screensize'=>'4_7inch','color'=>'silver','capacity'=>'16gb'), 1=>array('screensize'=>'4_7inch','color'=>'space_gray','capacity'=>'16gb'), 2=>array('screensize'=>'4_7inch','color'=>'gold','capacity'=>'16gb'), 3=>array('screensize'=>'4_7inch','color'=>'silver','capacity'=>'64gb'), 4=>array('screensize'=>'4_7inch','color'=>'space_gray','capacity'=>'64gb'), 5=>array('screensize'=>'4_7inch','color'=>'gold','capacity'=>'64gb'), 6=>array('screensize'=>'4_7inch','color'=>'silver','capacity'=>'128gb'), 7=>array('screensize'=>'4_7inch','color'=>'space_gray','capacity'=>'128gb'), 8=>array('screensize'=>'4_7inch','color'=>'gold','capacity'=>'128gb'), ); $iphone6plus=array( 0=>array('screensize'=>'5_5inch','color'=>'silver','capacity'=>'16gb'), 1=>array('screensize'=>'5_5inch','color'=>'space_gray','capacity'=>'16gb'), 2=>array('screensize'=>'5_5inch','color'=>'gold','capacity'=>'16gb'), 3=>array('screensize'=>'5_5inch','color'=>'silver','capacity'=>'64gb'), 4=>array('screensize'=>'5_5inch','color'=>'space_gray','capacity'=>'64gb'), 5=>array('screensize'=>'5_5inch','color'=>'gold','capacity'=>'64gb'), 6=>array('screensize'=>'5_5inch','color'=>'silver','capacity'=>'128gb'), 7=>array('screensize'=>'5_5inch','color'=>'space_gray','capacity'=>'128gb'), 8=>array('screensize'=>'5_5inch','color'=>'gold','capacity'=>'128gb'), ); // iphone 6 foreach ($iphone6 as $model) { $screensize=$model['screensize']; $color=$model['color']; $capacity=$model['capacity']; $json_url="http://store.apple.com/hk/buyFlowSelectionSummary/IPHONE6?node=home/shop_iphone/family/iphone6&step=select&option.dimensionScreensize=".$screensize."&option.dimensionColor=".$color."&option.dimensionCapacity=".$capacity."&option.carrierModel=UNLOCKED%2FWW&carrierPolicyType=UNLOCKED"; $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $json_url); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); curl_setopt($ch, CURLOPT_USERAGENT, $user_agent);//僞裝成瀏覽器 $str=curl_exec($ch); $str_array=json_decode($str,true); curl_close($ch); $available=$str_array['body']['content']['selected']['purchaseOptions']['isBuyable']; $partnumber=$str_array['body']['content']['selected']['partNumber']; if ($available!==false) { echo $screensize."-".$color."-".$capacity.": is available, please go to http://store.apple.com/hk-zh/buy-iphone/iphone6?cppart=UNLOCKED/WW&product=".$partnumber."&step=accessories"."\n"; $iphone6msg.="<p>".$screensize." ".$color." ".$capacity." is available, <a target=_blank href=\"http://store.apple.com/hk-zh/buy-iphone/iphone6?cppart=UNLOCKED/WW&product=".$partnumber."&step=accessories\">http://store.apple.com/hk-zh/buy-iphone/iphone6?cppart=UNLOCKED/WW&product=".$partnumber."&step=accessories</a></p>"; } } // iphone 6 plus foreach ($iphone6plus as $model) { $screensize=$model['screensize']; $color=$model['color']; $capacity=$model['capacity']; $json_url="http://store.apple.com/hk/buyFlowSelectionSummary/IPHONE6P?node=home/shop_iphone/family/iphone6&step=select&option.dimensionScreensize=".$screensize."&option.dimensionColor=".$color."&option.dimensionCapacity=".$capacity."&option.carrierModel=UNLOCKED%2FWW&carrierPolicyType=UNLOCKED"; $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $json_url); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); curl_setopt($ch, CURLOPT_USERAGENT, $user_agent); $str=curl_exec($ch); $str_array=json_decode($str,true); curl_close($ch); $available=$str_array['body']['content']['selected']['purchaseOptions']['isBuyable']; $partnumber=$str_array['body']['content']['selected']['partNumber']; if ($available!==false) { echo $screensize."-".$color."-".$capacity.": is available, please go to http://store.apple.com/hk-zh/buy-iphone/iphone6?cppart=UNLOCKED/WW&product=".$partnumber."&step=accessories"."\n"; $iphone6msg.="<p>".$screensize." ".$color." ".$capacity." is available, <a target=_blank href=\"http://store.apple.com/hk-zh/buy-iphone/iphone6?cppart=UNLOCKED/WW&product=".$partnumber."&step=accessories\">http://store.apple.com/hk-zh/buy-iphone/iphone6?cppart=UNLOCKED/WW&product=".$partnumber."&step=accessories</a></p>"; } } if (!empty($iphone6msg)) { mail($recipient,$subject,$iphone6msg,$headers); } //$json_url="http://store.apple.com/hk/buyFlowSelectionSummary/IPHONE6P?node=home/shop_iphone/family/iphone6&step=select&option.dimensionScreensize=".$screensize."&option.dimensionColor=".$color."&option.dimensionCapacity=".$capacity."&option.carrierModel=UNLOCKED%2FWW&carrierPolicyType=UNLOCKED"; //var_dump($i6); ?>
至於該監控是否準確，有待驗證，只能坐等蘋果有好消息了，希望延遲不會超過10分鐘（假如郵件能夠正常發送成功的話）。