Added Search Link for bad bookName/articleName on 404

src/server/internalServer.cpp

@@ -742,6 +742,15 @@ std::string get_book_name(const RequestContext& request)
   }
 }
 
+std::string searchSuggestionHTML(const std::string& searchURL, const std::string& pattern)
+{
+  kainjow::mustache::mustache tmpl("Make a full text search for <a href=\"{{{searchURL}}}\">{{pattern}}</a>");
+  MustacheData data;
+  data.set("pattern", pattern);
+  data.set("searchURL", searchURL);
+  return (tmpl.render(data));
+}
+
 } // unnamed namespace
 
 std::shared_ptr<Reader>
@@ -765,6 +774,8 @@ InternalServer::build_redirect(const std::string& bookName, const kiwix::Entry&
 
 std::unique_ptr<Response> InternalServer::handle_content(const RequestContext& request)
 {
+  const std::string url = request.get_url();
+  const std::string pattern = url.substr((url.find_last_of('/'))+1);
   if (m_verbose.load()) {
     printf("** running handle_content\n");
   }
@@ -775,7 +786,10 @@ std::unique_ptr<Response> InternalServer::handle_content(const RequestContext& r
 
   const std::shared_ptr<Reader> reader = get_reader(bookName);
   if (reader == nullptr) {
-    return Response::build_404(*this, request, bookName);
+    std::string searchURL = m_root+"/search?pattern="+pattern; // Make a full search on the entire library.
+    const std::string details = searchSuggestionHTML(searchURL, kiwix::urlDecode(pattern));
+
+    return Response::build_404(*this, request, bookName, details); 
   }
 
   auto urlStr = request.get_url().substr(bookName.size()+1);
@@ -805,7 +819,10 @@ std::unique_ptr<Response> InternalServer::handle_content(const RequestContext& r
     if (m_verbose.load())
       printf("Failed to find %s\n", urlStr.c_str());
 
-    return Response::build_404(*this, request, bookName);
+    std::string searchURL = m_root+"/search?content="+bookName+"&pattern="+pattern; // Make a search on this specific book only.
+    const std::string details = searchSuggestionHTML(searchURL, kiwix::urlDecode(pattern));
+
+    return Response::build_404(*this, request, bookName, details);
   }
 }
 

src/server/response.cpp

@@ -93,10 +93,11 @@ std::unique_ptr<Response> Response::build_304(const InternalServer& server, cons
   return response;
 }
 
-std::unique_ptr<Response> Response::build_404(const InternalServer& server, const RequestContext& request, const std::string& bookName)
+std::unique_ptr<Response> Response::build_404(const InternalServer& server, const RequestContext& request, const std::string& bookName, const std::string& details)
 {
   MustacheData results;
   results.set("url", request.get_full_url());
+  results.set("details", details);
 
   auto response = ContentResponse::build(server, RESOURCE::templates::_404_html, results, "text/html");
   response->set_code(MHD_HTTP_NOT_FOUND);

src/server/response.h

@@ -47,7 +47,7 @@ class Response {
 
     static std::unique_ptr<Response> build(const InternalServer& server);
     static std::unique_ptr<Response> build_304(const InternalServer& server, const ETag& etag);
-    static std::unique_ptr<Response> build_404(const InternalServer& server, const RequestContext& request, const std::string& bookName);
+    static std::unique_ptr<Response> build_404(const InternalServer& server, const RequestContext& request, const std::string& bookName, const std::string& details="");
     static std::unique_ptr<Response> build_416(const InternalServer& server, size_t resourceLength);
     static std::unique_ptr<Response> build_500(const InternalServer& server, const std::string& msg);
     static std::unique_ptr<Response> build_redirect(const InternalServer& server, const std::string& redirectUrl);

static/templates/404.html

@@ -9,5 +9,10 @@
     <p>
       The requested URL "{{url}}" was not found on this server.
     </p>
+    {{#details}}
+    <p>
+      {{{details}}}
+    </p>
+    {{/details}}
   </body>
 </html>