X-Git-Url: https://git.ao2.it/tweeper.git/blobdiff_plain/7f80e1efb56d6ac3186962cbe658d129b84a33cd..b187bb677361d17a468abf749332d081a194b4bd:/src/rss_converter_facebook.com.xsl

diff --git a/src/rss_converter_facebook.com.xsl b/src/rss_converter_facebook.com.xsl
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+<!--
+  Stylesheet to convert a Facebook public page to RSS.
+
+  Copyright (C) 2015  Antonio Ospite <ao2@ao2.it>
+
+  This file is part of tweeper.
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+-->
+
+<!--
+  Since June 23rd, 2015 facebook.com deprecated the RSS feed endpoint for public pages:
+  https://developers.facebook.com/docs/apps/changelog#v2_3_90_day_deprecations
+
+  They suggest to use the Graph API but they fail to mention that it does not
+  work anymore without authentication, so it cannot be considered an
+  _equivalent_ solution.
+
+  Luckily we've got Tweeper!
+-->
+
+<xsl:stylesheet version="1.0"
+    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+    xmlns:php="http://php.net/xsl"
+    xsl:extension-element-prefixes="php"
+    exclude-result-prefixes="php">
+
+    <xsl:output method="xml" indent="yes"/>
+
+    <xsl:variable name="BaseURL">
+        <xsl:text>https://facebook.com</xsl:text>
+    </xsl:variable>
+
+    <!--
+         Extract the page id from an element like:
+        <meta property="al:android:url" content="fb://page/793837197390834">
+
+        The page id will be used to build the permalink.
+    -->
+    <xsl:variable
+        name="page-id"
+        select="substring-after(//meta[@property='al:android:url']/@content, 'fb://page/')"/>
+
+    <xsl:template match="//div[contains(@class, 'userContentWrapper')]">
+        <xsl:variable name="story-id" select=".//input[@name='ft_ent_identifier']/@value"/>
+        <xsl:variable
+            name="item-permalink"
+            select="concat($BaseURL, '/permalink.php?id=', $page-id, '&amp;story_fbid=', $story-id)"/>
+
+        <!-- Get only the first child in order to skip the footer of the content -->
+        <xsl:variable name="item-content" select="div[1]"/>
+
+        <item>
+            <title>
+                <xsl:variable name="item-title" select="$item-content//p"/>
+                <xsl:variable name="title-length" select="140"/>
+                <!-- ellipsize, inspired from http://stackoverflow.com/questions/13622338 -->
+                <xsl:choose>
+                    <xsl:when test="string-length($item-title) > $title-length">
+                        <xsl:variable name="truncated-length" select="$title-length - 3"/>
+                        <xsl:value-of select="substring($item-title, 1, $truncated-length)"/>
+                        <xsl:text>...</xsl:text>
+                    </xsl:when>
+                    <xsl:otherwise>
+                        <xsl:value-of select="$item-title"/>
+                    </xsl:otherwise>
+                </xsl:choose>
+            </title>
+            <link>
+                <xsl:value-of select="$item-permalink"/>
+            </link>
+            <guid>
+                <xsl:value-of select="$item-permalink"/>
+            </guid>
+            <pubDate>
+                <xsl:variable name="timestamp" select=".//abbr[@data-shorten]/@data-utime"/>
+                <xsl:value-of select="php:functionString('Tweeper::epochToRssDate', $timestamp)"/>
+            </pubDate>
+            <description>
+
+                <!--
+                     Get only the children starting from the one with class="userContent",
+                     this way the content header is skipped
+                -->
+                <xsl:variable
+                    name="usercontent-position"
+                    select="count($item-content/div[contains(@class, 'userContent')]/preceding-sibling::*) + 1"/>
+
+                <xsl:text disable-output-escaping="yes">&lt;![CDATA[</xsl:text>
+                <xsl:copy-of select="$item-content/div[position() >= $usercontent-position]"/>
+                <xsl:text disable-output-escaping="yes">]]&gt;</xsl:text>
+            </description>
+        </item>
+    </xsl:template>
+
+    <xsl:template match="/">
+        <xsl:variable name="channel-title" select="//title"/>
+        <xsl:variable name="channel-link" select="//div[contains(@class, 'userContentWrapper')][1]//a[1]/@href"/>
+
+        <rss version="2.0">
+            <xsl:attribute name="xml:base"><xsl:value-of select="$BaseURL" /></xsl:attribute>
+            <channel>
+                <generator>Tweeper</generator>
+                <title>
+                    <xsl:value-of select="$channel-title"/>
+                </title>
+                <link>
+                    <xsl:value-of select="$channel-link"/>
+                </link>
+                <description>
+                    <xsl:text disable-output-escaping="yes">&lt;![CDATA[</xsl:text>
+                    <xsl:copy-of select="//div[@data-id='1']/node()"/>
+                    <xsl:text disable-output-escaping="yes">]]&gt;</xsl:text>
+                </description>
+                <image>
+                    <title>
+                        <xsl:value-of select="$channel-title"/>
+                    </title>
+                    <link>
+                        <xsl:value-of select="$channel-link"/>
+                    </link>
+                    <url>
+                        <xsl:value-of select="//img[@class='profilePic img']/@src"/>
+                    </url>
+                </image>
+                <xsl:apply-templates select="//div[contains(@class, 'userContentWrapper')]"/>
+            </channel>
+        </rss>
+    </xsl:template>
+</xsl:stylesheet>