Fixes #176 - Add opensearch functionality

* add a new page in Router: do=opensearch which displays the opensearch plugin
 * using base64 compressed image to avoid issue encountered with HTTPS

application/Router.php

@@ -29,6 +29,8 @@ class Router
 
     public static $PAGE_IMPORT = 'import';
 
+    public static $PAGE_OPENSEARCH = 'opensearch';
+
     public static $PAGE_LINKLIST = 'linklist';
 
     /**
@@ -63,6 +65,10 @@ class Router
             return self::$PAGE_TAGCLOUD;
         }
 
+        if (startswith($query, 'do='. self::$PAGE_OPENSEARCH)) {
+            return self::$PAGE_OPENSEARCH;
+        }
+
         // At this point, only loggedin pages.
         if (!$loggedIn) {
             return self::$PAGE_LINKLIST;

index.php

@@ -1204,6 +1204,14 @@ function renderPage()
         exit;
     }
 
+    // Display openseach plugin (XML)
+    if ($targetPage == Router::$PAGE_OPENSEARCH) {
+        header('Content-Type: application/xml; charset=utf-8');
+        $PAGE->assign('serverurl', index_url($_SERVER));
+        $PAGE->renderPage('opensearch');
+        exit;
+    }
+
     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
     if (isset($_GET['addtag']))
     {

tpl/includes.html

@@ -10,4 +10,5 @@
 {if="is_file('inc/user.css')"}<link type="text/css" rel="stylesheet" href="../inc/user.css" />{/if}
 {loop="$plugins_includes.css_files"}
 <link type="text/css" rel="stylesheet" href="{$value}#"/>
-{/loop}
+{/loop}
+<link rel="search" type="application/opensearchdescription+xml" href="?do=opensearch#" title="Shaarli search - {$shaarlititle|htmlspecialchars}"/>

tpl/opensearch.html

@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/">
+    <ShortName>Shaarli search - {$pagetitle}</ShortName>
+    <Description>Shaarli search - {$pagetitle}</Description>
+    <Url type="text/html" template="{$serverurl}?searchterm={searchTerms}" />
+    <Url type="application/atom+xml" template="{$serverurl}?do=atom&amp;searchterm={searchTerms}"/>
+    <Url type="application/rss+xml" template="{$serverurl}?do=rss&amp;searchterm={searchTerms}"/>
+    <InputEncoding>UTF-8</InputEncoding>
+    <Developer>Shaarli Community - https://github.com/shaarli/Shaarli/</Developer>
+    <Image width="16" height="16">data:image/x-icon;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYCAYAAADgdz34AAAABmJLR0QA/wD/AP+gvaeTAAAHRklE
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+    </Image>
+</OpenSearchDescription>