Add the language parameter in the xml result.

As `language` is a declared argument for the search query, we need it in
`openSearch::Query` tag.

We are assuming that user follow the query described in
`searchdescription.xml` and that if `language` is specified, it is the
only book request argument provided.

include/search_renderer.h

@@ -80,6 +80,11 @@ class SearchRenderer
    */
   void setSearchPattern(const std::string& pattern);
 
+  /**
+   * Set the search lang used to do the search
+   */
+  void setSearchLang(const std::string& lang);
+
   /**
    * Set the book names used to do the search.
    */
@@ -122,6 +127,7 @@ class SearchRenderer
   Library* mp_library;
   std::set<std::string> searchBookIds;
   std::string searchPattern;
+  std::string searchLang;
   std::string protocolPrefix;
   std::string searchProtocolPrefix;
   unsigned int pageLength;

src/search_renderer.cpp

@@ -71,6 +71,11 @@ void SearchRenderer::setSearchPattern(const std::string& pattern)
   searchPattern = pattern;
 }
 
+void SearchRenderer::setSearchLang(const std::string& lang)
+{
+  searchLang = lang;
+}
+
 void SearchRenderer::setSearchBookIds(const std::set<std::string>& bookIds)
 {
   searchBookIds = bookIds;
@@ -90,14 +95,20 @@ kainjow::mustache::data buildQueryData
 (
   const std::string& searchProtocolPrefix,
   const std::string& pattern,
+  const std::string& lang,
   const std::set<std::string>& bookIds
 ) {
   kainjow::mustache::data query;
   query.set("pattern", kiwix::encodeDiples(pattern));
   std::ostringstream ss;
   ss << searchProtocolPrefix << "?pattern=" << urlEncode(pattern);
-  for (auto& bookId: bookIds) {
-    ss << "&books.id="<<urlEncode(bookId);
+  if(!lang.empty()) {
+    query.set("lang", kiwix::encodeDiples(lang));
+    ss << "?books.query.lang=" << urlEncode(lang);
+  } else {
+    for (auto& bookId: bookIds) {
+      ss << "&books.id="<<urlEncode(bookId);
+    }
   }
   query.set("unpaginatedQuery", ss.str());
   return query;
@@ -197,6 +208,7 @@ std::string SearchRenderer::renderTemplate(const std::string& tmpl_str)
   kainjow::mustache::data query = buildQueryData(
     searchProtocolPrefix,
     searchPattern,
+    searchLang,
     searchBookIds
   );
 

src/server/internalServer.cpp

@@ -738,6 +738,8 @@ std::unique_ptr<Response> InternalServer::handle_search(const RequestContext& re
     renderer.setSearchProtocolPrefix(m_root + "/search");
     renderer.setPageLength(pageLength);
     if (request.get_optional_param<std::string>("format", "") == "xml") {
+      auto lang = request.get_optional_param<std::string>("books.query.lang", "");
+      renderer.setSearchLang(lang);
       return ContentResponse::build(*this, renderer.getXml(), "application/rss+xml; charset=utf-8",
       /*isHomePage =*/false,
       /*raw =*/true);

static/templates/search_result.xml

@@ -14,6 +14,7 @@
       searchTerms="{{query.pattern}}"
       startIndex="{{results.start}}"
       count="{{pagination.itemsPerPage}}"
+      {{#query.lang}}language="{{query.lang}}"{{/query.lang}}
     />
     {{#results.items}}
     <item>