添加 RSS 聯(lián)合供稿

勇生 2007-01-16

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RSS 聯(lián)合供稿使用 <feed> 元素。以下是 CNN 新聞聯(lián)合供稿的示例：

<feed refresh-interval="1800">http://rss./rss/cnn_topstories.rss</feed>

獲取這些更新聯(lián)合供稿的協(xié)議為 Atom 1.0、Atom 0.3、RSS 2.0 或 RSS 1.0。標(biāo)準(zhǔn)聯(lián)合供稿通常都會(huì)正常運(yùn)行。

使用聯(lián)合供稿更新按鈕圖標(biāo)/工具提示

要通過(guò)聯(lián)合供稿更新工具欄上的圖標(biāo)或工具提示說(shuō)明，您需要將特定工具欄擴(kuò)展件添加到使用名稱(chēng)空間的 RSS 或 ATOM。下面是從聯(lián)合供稿中提取的心情圈圈按鈕的示例：

<?xml version="1.0" encoding="utf-8"?>
<custombuttons xmlns="http://toolbar.google.com/custombuttons/">
<button>
<title>Mood ring</title>
<description>Your virtual mood ring</description>
<site>http://www.google.com/search?q=mood+ring</site>
<feed menu="false" refresh-interval="900">
http://www./custombuttons/samples/feeds/mood</feed>
</button>
</custombuttons>

注意，它指定 menu="false" 表示此聯(lián)合供稿僅用于更新圖標(biāo)和工具提示，而不能填充子項(xiàng)目的下拉菜單。

如果在實(shí)際的服務(wù)器上安裝了它，聯(lián)合供稿輸出則如下所示：

<?xml version=‘1.0‘?>
<feed xmlns=‘http://www./2005/Atom‘
xmlns:gtb=‘http://toolbar.google.com/custombuttons/‘>
<id>http://www./custombuttons/samples/feeds/mood</id>
<title>Mood</title>
<link href=‘http://www.google.com/search?q=+ring‘ />
<link rel=‘self‘
href=‘http://www./custombuttons/samples/feeds/mood‘ />
<gtb:description>Bluegreen:
Inner emotions charged, somewhat relaxed</gtb:description>
<gtb:icon mode="base64" type="image/x-icon">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</gtb:icon>
</feed>

以上示例是 Atom 1.0 聯(lián)合供稿，包含的 Google 自定義按鈕名稱(chēng)空間指定為：

xmlns:gtb=‘http://toolbar.google.com/custombuttons/‘

要覆蓋隨按鈕出現(xiàn)的工具提示，請(qǐng)指定：

<gtb:description> new-description </gtb:description>

要覆蓋隨按鈕出現(xiàn)的圖標(biāo)，請(qǐng)指定：

<gtb:icon> icon-base64-code </gtb:icon>

控制這種復(fù)雜的“心情”分析系統(tǒng)的 PHP 腳本如下所示：

<?php
header(‘Content-type: text/xml‘);
switch(rand(1, 7)) {
case 1:
$icon = "amber.ico";
$desc = "Amber:\nNervous, on edge, uncertain";
break;
case 2:
$icon = "black.ico";
$desc = "Black:\nTense, stressed, working too hard";
break;
case 3:
$icon = "blue.ico";
$desc = "Blue:\nComfortable, breeze, at rest, loveable";
break;
case 4:
$icon = "bluegreen.ico";
$desc = "Bluegreen:\nHeightened inner emotional state, moderately relaxed";
break;
case 5:
$icon = "gray.ico";
$desc = "Gray:\nAnxious, ill at ease, strained";
break;
case 6:
$icon = "green.ico";
$desc = "Green:\nSteady, stable, no emotional turmoil";
brea;
case 7:
$icon = "purple.ico";
$desc = "Dark Blue:\nImpassioned, delighted, whiff of romance";
break;
}
$icon = base64_encode(file_get_contents($icon));
echo "<?xml version=‘1.0‘?>";
echo "\n<feed xmlns=‘http://www./2005/Atom‘ xmlns:gtb=‘http://toolbar.google.com/custombuttons/‘>";
echo "\n<id>http://www./custombuttons/samples/feeds/mood</id>";
echo "\n<title>Mood</title>";
echo "\n<link href=‘http://www.google.com/search?q=$mood+ring‘ />";
echo "\n<link rel=‘self‘ href=‘http://www./custombuttons/samples/feeds/mood‘ />";
echo "\n<gtb:description>$desc</gtb:description>";
echo "\n<gtb:icon mode=‘base64‘ type=‘image/x-icon‘>$icon</gtb:icon>";
echo "\n</feed>";
?>

圖標(biāo)應(yīng)該和腳本位于同一文件夾中。

使用聯(lián)合供稿更新按鈕和下拉菜單圖標(biāo)

您還可以將自定義服務(wù)器圖標(biāo)添加到聯(lián)合供稿下拉菜單上的單個(gè)項(xiàng)目上。下面是天氣按鈕示例，它具有包含下拉菜單（默認(rèn)值）的聯(lián)合供稿，但是還可以指定 refresh-menuitem="false" 隱藏隨時(shí)連接到服務(wù)器的刷新菜單項(xiàng)目。這樣可以提供更加簡(jiǎn)潔的外觀。

<?xml version="1.0" encoding="utf-8"?>
<custombuttons xmlns="http://toolbar.google.com/custombuttons/">
<button>
<title>Weather 94043</title>
<description>Weather updates for Mountain View, CA</description>
<site>http://www.google.com/search?q=weather+94043&num=1</site>
<feed refresh-interval="3600" refresh-menuitem="false">
http://www./custombuttons/samples/feeds/weather?zip=94043</feed>
</button>
</custombuttons>

下面是天氣聯(lián)合供稿外觀的示例，在下拉菜單中各個(gè)菜單項(xiàng)目旁邊都有自定義圖標(biāo)（為簡(jiǎn)潔起見(jiàn)，大多數(shù)圖標(biāo)已經(jīng)刪除 base64 編碼的資料）?；谝陨鲜纠?，它可見(jiàn)于：http://www./custombuttons/samples/feeds/weather/?zip=94043

<?xml version=‘1.0‘?>
<feed xmlns=‘http://www./2005/Atom‘
xmlns:gtb=‘http://toolbar.google.com/custombuttons/‘>
<id>http://www./custombuttons/samples/feeds/weather</id>
<title>Weather Mountain View, CA</title>
<link href=‘http://www.google.com/search?q=weather+94043/‘ />
<link rel=‘self‘
href=‘http://www./custombuttons/samples/feeds/weather‘ />
<gtb:description>Mountain View, CA
63F Mostly Cloudy
Humidity: 48%
Wind: NW at 8 mph</gtb:description>
<gtb:icon mode=‘base64‘ type=‘image/x-icon‘>
R0lGODlhKAAoANUAAEuc/Pz8/Fik/Ii00k9daZGPivLy8tbW1k2R0uvr6wZj3HSq0f/QMMfHx7a2
tj2F0fu0EePj4yx81neUp4J/eKanphJq3IJtOGB3iI3C5BFt5B5XnWis7H2346jO5/6+IWKo8923
... and so on...
</gtb:icon>
<entry>
<title>Today: Mostly Cloudy 65 | 50</title>
<link href=‘http://www.google.com/search?q=weather+94043/‘ />
<id>http://www./custombuttons/samples/feeds/weather/0</id>
<gtb:icon mode=‘base64‘ type=‘image/x-icon‘>
R0lGODlhKAAoANUAAEuc/Pz8/Fik/Ii00k9daZGPivLy8tbW1k2R0uvr6wZj3HSq0f/QMMfHx7a2
tj2F0fu0EePj4yx81neUp4J/eKanphJq3IJtOGB3iI3C5BFt5B5XnWis7H2346jO5/6+IWKo8923
... and so on...
</entry>
<entry>
<title>Thu:  66 | 51</title>
<link href=‘http://www.google.com/search?q=weather+94043/‘ />
<id>http://www./custombuttons/samples/feeds/weather/1</id>
<gtb:icon mode=‘base64‘ type=‘image/x-icon‘>
R0lGODlhKAAoAPcAAAAAAP///4WOwPT1+tDT3unr8sHG1ff5/6Wy0mZ8rGqAr3mJrJakxa+zvHSK
tcDBw1R2slBql110njBXjztmqS9OfjtekTZWhGeJuoqctklLTgJYyQJQtQ9hzhRr3BZlzBVRoS1S
... and so on...
</gtb:icon>
</entry>
<entry>
<title>Fri:  67 | 51</title>
<link href=‘http://www.google.com/search?q=weather+94043/‘ />
<id>http://www./custombuttons/samples/feeds/weather/2</id>
<gtb:icon mode=‘base64‘ type=‘image/x-icon‘>
R0lGODlhKAAoANUAAObm52ms7k2Q0Uuc/Fmk+v2zDoS01HOp0avP5tvb26CPXQZj3DqG14yLh05Y
Yf/IKv/VN3mCiMPDw6SkpCt82GhxePz8/JG+2pd5NRZu3hBq3fb29rCAFrm5uSN549OWE4WltqHI
... and so on...
</gtb:icon>
</entry>
<entry>
<title>Sat:  67 | 50</title>
<link href=‘http://www.google.com/search?q=weather+94043/‘ />
<id>http://www./custombuttons/samples/feeds/weather/3</id>
<gtb:icon mode=‘base64‘ type=‘image/x-icon‘>
R0lGODlhKAAoANUAAObm52ms7k2Q0Uuc/Fmk+v2zDoS01HOp0avP5tvb26CPXQZj3DqG14yLh05Y
Yf/IKv/VN3mCiMPDw6SkpCt82GhxePz8/JG+2pd5NRZu3hBq3fb29rCAFrm5uSN549OWE4WltqHI
... and so on...
</gtb:icon>
</entry>
</feed>

為此，PHP 代碼使用天氣預(yù)報(bào)回復(fù)格式。

<?php
// Script to convert Google xml weather interface to custom buttons AtomFeed 1.0
// Sample input at http://www.google.com/ig/api?weather=94043
// To see sample output, run this script with ?zip=94043
$zip = $_GET[‘zip‘];
header(‘Content-type: text/xml‘);
// http://www.google.com/ig/api?weather=94043
$dom= domxml_open_file("http://www.google.com/ig/api?weather=$zip");
$xpath = xpath_new_context($dom);
// $params = $dom->documentElement->firstChild->getElementsByTagName(‘param‘);
$temp = $xpath->xpath_eval(‘//city/@data‘);
$city = $temp->nodeset[0]->value;
$icons = $xpath->xpath_eval(‘//current_conditions/icon/@data‘);
$icon_url = $icons->nodeset[0]->value;
$icon = base64_encode(file_get_contents("http://www.google.com$icon_url"));
$conditions = $xpath->xpath_eval(‘//current_conditions/condition/@data‘);
$condition = $conditions->nodeset[0]->value;
$temp = $xpath->xpath_eval(‘//current_conditions/temp_f/@data‘);
$tempf = $temp->nodeset[0]->value;
$temp = $xpath->xpath_eval(‘//current_conditions/humidity/@data‘);
$humidity = $temp->nodeset[0]->value;
$temp = $xpath->xpath_eval(‘//current_conditions/wind_condition/@data‘);
$wind = $temp->nodeset[0]->value;
echo "<?xml version=‘1.0‘?>";
echo "\n<feed xmlns=‘http://www./2005/Atom‘ ";
echo     "xmlns:gtb=‘http://toolbar.google.com/custombuttons/‘>";
echo "\n<id>http://www./custombuttons/samples/feeds/weather</id>";
echo "\n<title>Weather $city</title>";
echo "\n<link href=‘http://www.google.com/search?q=weather+$zip/‘ />";
echo "\n<link rel=‘self‘ href=‘http://www./custombuttons/";
echo     "samples/feeds/weather‘ />";
echo "\n<gtb:description>$city\n$tempfF $condition\n$humidity\n$wind";
echo   "</gtb:description>";
echo "\n<gtb:icon mode=‘base64‘ type=‘image/x-icon‘>$icon</gtb:icon>";
$days = $xpath->xpath_eval(‘//forecast_conditions/day_of_week/@data‘);
$conditions = $xpath->xpath_eval(‘//forecast_conditions/condition/@data‘);
$icons = $xpath->xpath_eval(‘//forecast_conditions/icon/@data‘);
$highs = $xpath->xpath_eval(‘//forecast_conditions/high/@data‘);
$lows = $xpath->xpath_eval(‘//forecast_conditions/low/@data‘);
for ($i = 0; $i < count($conditions->nodeset); $i++) {
$day_of_week = $days->nodeset[$i]->value;
$condition = $conditions->nodeset[$i]->value;
$high = $highs->nodeset[$i]->value;
$low = $lows->nodeset[$i]->value;
echo "\n<entry>";
echo "\n<title>$day_of_week: $condition $high | $low</title>";
echo "\n<link href=‘http://www.google.com/search?q=weather+$zip/‘ />";
echo "\n<id>http://www./custombuttons/samples/feeds/weather/$i</id>";
$icon_url = $icons->nodeset[$i]->value;
$icon = base64_encode(file_get_contents("http://www.google.com$icon_url"));
echo "\n<gtb:icon mode=‘base64‘ type=‘image/x-icon‘>$icon</gtb:icon>";
echo "\n</entry>";
}
echo "\n</feed>";
?>

您還可以使用相同的 http://toolbar.google.com/custombuttons/ 名稱(chēng)空間和說(shuō)明或者 RSS 1.0、RSS 2.0、Atom 1.0 及 Atom 0.3 聯(lián)合供稿中的圖標(biāo)標(biāo)記用于工具欄聯(lián)合供稿。

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