Refactoring: smart Response::set_entry()

Response::set_entry() was upgraded from a simple setter to a method
performing certain business logic that was previously taken care of by
InternalServer::handle_content().

src/server.cpp

@@ -853,20 +853,6 @@ std::string get_mime_type(const kiwix::Entry& entry)
   }
 }
 
-bool is_compressible_mime_type(const std::string& mimeType)
-{
-  return mimeType.find("text/") != string::npos
-      || mimeType.find("application/javascript") != string::npos
-      || mimeType.find("application/json") != string::npos;
-}
-
-int get_range_len(const kiwix::Entry& entry, RequestContext::ByteRange range)
-{
-  return range.second == -1
-       ? entry.getSize() - range.first
-       : range.second - range.first;
-}
-
 } // unnamed namespace
 
 std::shared_ptr<Reader>
@@ -935,25 +921,7 @@ Response InternalServer::handle_content(const RequestContext& request)
 
   auto response = get_default_response();
 
-  ///////////////////////////////////////////////////////////
-  // This chunk of code should go into Response::set_entry()
-  response.set_mimeType(mimeType);
-  response.set_cache(true);
-
-  if ( is_compressible_mime_type(mimeType) ) {
-    zim::Blob raw_content = entry.getBlob();
-    const std::string content = string(raw_content.data(), raw_content.size());
-
-    response.set_content(content);
-    response.set_compress(true);
-  } else {
-    const int range_len = get_range_len(entry, request.get_range());
-    response.set_entry(entry);
-    response.set_range_first(request.get_range().first);
-    response.set_range_len(range_len);
-  }
-  // This chunk of code should go into Response::set_entry()
-  ///////////////////////////////////////////////////////////
+  response.set_entry(entry, request);
 
   if (mimeType.find("text/html") != string::npos)
     response.set_taskbar(bookName, reader->getTitle());

src/server/response.cpp

@@ -17,6 +17,35 @@
 
 namespace kiwix {
 
+namespace
+{
+// some utilities
+
+std::string get_mime_type(const kiwix::Entry& entry)
+{
+  try {
+    return entry.getMimetype();
+  } catch (exception& e) {
+    return "application/octet-stream";
+  }
+}
+
+bool is_compressible_mime_type(const std::string& mimeType)
+{
+  return mimeType.find("text/") != string::npos
+      || mimeType.find("application/javascript") != string::npos
+      || mimeType.find("application/json") != string::npos;
+}
+
+int get_range_len(const kiwix::Entry& entry, RequestContext::ByteRange range)
+{
+  return range.second == -1
+       ? entry.getSize() - range.first
+       : range.second - range.first;
+}
+
+} // unnamed namespace
+
 Response::Response(const std::string& root, bool verbose, bool withTaskbar, bool withLibraryButton, bool blockExternalLinks)
   : m_verbose(verbose),
     m_root(root),
@@ -269,9 +298,25 @@ void Response::set_redirection(const std::string& url) {
   m_returnCode = MHD_HTTP_FOUND;
 }
 
-void Response::set_entry(const Entry& entry) {
+void Response::set_entry(const Entry& entry, const RequestContext& request) {
   m_entry = entry;
   m_mode = ResponseMode::ENTRY;
+
+  const std::string mimeType = get_mime_type(entry);
+  set_mimeType(mimeType);
+  set_cache(true);
+
+  if ( is_compressible_mime_type(mimeType) ) {
+    zim::Blob raw_content = entry.getBlob();
+    const std::string content = string(raw_content.data(), raw_content.size());
+
+    set_content(content);
+    set_compress(true);
+  } else {
+    const int range_len = get_range_len(entry, request.get_range());
+    set_range_first(request.get_range().first);
+    set_range_len(range_len);
+  }
 }
 
 void Response::set_taskbar(const std::string& bookName, const std::string& bookTitle)

src/server/response.h

@@ -50,7 +50,7 @@ class Response {
     void set_template(const std::string& template_str, kainjow::mustache::data data);
     void set_content(const std::string& content);
     void set_redirection(const std::string& url);
-    void set_entry(const Entry& entry);
+    void set_entry(const Entry& entry, const RequestContext& request);
 
 
     void set_mimeType(const std::string& mimeType) { m_mimeType = mimeType; }