OPDS catalog languages endpoint

include/library.h

@@ -154,6 +154,7 @@ class Library
 
  public:
   typedef std::vector<std::string> BookIdCollection;
+  typedef std::map<std::string, int> AttributeCounts;
 
  public:
   Library();
@@ -242,6 +243,13 @@ class Library
    */
   std::vector<std::string> getBooksLanguages() const;
 
+  /**
+   * Get all languagues of the books in the library with counts.
+   *
+   * @return A list of languages with the count of books in each language.
+   */
+  AttributeCounts getBooksLanguagesWithCounts() const;
+
   /**
    * Get all categories of the books in the library.
    *
@@ -341,7 +349,12 @@ class Library
   friend class OPDSDumper;
   friend class libXMLDumper;
 
+private: // types
+  typedef const std::string& (Book::*BookStrPropMemFn)() const;
+
 private: // functions
+  AttributeCounts getBookAttributeCounts(BookStrPropMemFn p) const;
+  std::vector<std::string> getBookPropValueSet(BookStrPropMemFn p) const;
   BookIdCollection filterViaBookDB(const Filter& filter) const;
   void updateBookDB(const Book& book);
 };

include/opds_dumper.h

@@ -66,10 +66,16 @@ class OPDSDumper
   /**
    * Dump the categories OPDS feed.
    *
-   * @param categories list of category names
    * @return The OPDS feed.
    */
-  std::string categoriesOPDSFeed(const std::vector<std::string>& categories) const;
+  std::string categoriesOPDSFeed() const;
+
+  /**
+   * Dump the languages OPDS feed.
+   *
+   * @return The OPDS feed.
+   */
+  std::string languagesOPDSFeed() const;
 
   /**
    * Set the id of the library.

src/library.cpp

@@ -208,23 +208,36 @@ bool Library::writeBookmarksToFile(const std::string& path) const
   return writeTextFile(path, dumper.dumpLibXMLBookmark());
 }
 
-std::vector<std::string> Library::getBooksLanguages() const
+Library::AttributeCounts Library::getBookAttributeCounts(BookStrPropMemFn p) const
 {
-  std::vector<std::string> booksLanguages;
-  std::map<std::string, bool> booksLanguagesMap;
+  AttributeCounts propValueCounts;
 
-  for (auto& pair: m_books) {
-    auto& book = pair.second;
-    auto& language = book.getLanguage();
-    if (booksLanguagesMap.find(language) == booksLanguagesMap.end()) {
-      if (book.getOrigId().empty()) {
-        booksLanguagesMap[language] = true;
-        booksLanguages.push_back(language);
-      }
+  for (const auto& pair: m_books) {
+    const auto& book = pair.second;
+    if (book.getOrigId().empty()) {
+      propValueCounts[(book.*p)()] += 1;
     }
   }
+  return propValueCounts;
+}
+
+std::vector<std::string> Library::getBookPropValueSet(BookStrPropMemFn p) const
+{
+  std::vector<std::string> result;
+  for ( const auto& kv : getBookAttributeCounts(p) ) {
+    result.push_back(kv.first);
+  }
+  return result;
+}
+
+std::vector<std::string> Library::getBooksLanguages() const
+{
+  return getBookPropValueSet(&Book::getLanguage);
+}
 
-  return booksLanguages;
+Library::AttributeCounts Library::getBooksLanguagesWithCounts() const
+{
+  return getBookAttributeCounts(&Book::getLanguage);
 }
 
 std::vector<std::string> Library::getBooksCategories() const
@@ -244,40 +257,12 @@ std::vector<std::string> Library::getBooksCategories() const
 
 std::vector<std::string> Library::getBooksCreators() const
 {
-  std::vector<std::string> booksCreators;
-  std::map<std::string, bool> booksCreatorsMap;
-
-  for (auto& pair: m_books) {
-    auto& book = pair.second;
-    auto& creator = book.getCreator();
-    if (booksCreatorsMap.find(creator) == booksCreatorsMap.end()) {
-      if (book.getOrigId().empty()) {
-        booksCreatorsMap[creator] = true;
-        booksCreators.push_back(creator);
-      }
-    }
-  }
-
-  return booksCreators;
+  return getBookPropValueSet(&Book::getCreator);
 }
 
 std::vector<std::string> Library::getBooksPublishers() const
 {
-  std::vector<std::string> booksPublishers;
-  std::map<std::string, bool> booksPublishersMap;
-
-  for (auto& pair:m_books) {
-    auto& book = pair.second;
-    auto& publisher = book.getPublisher();
-    if (booksPublishersMap.find(publisher) == booksPublishersMap.end()) {
-      if (book.getOrigId().empty()) {
-        booksPublishersMap[publisher] = true;
-        booksPublishers.push_back(publisher);
-      }
-    }
-  }
-
-  return booksPublishers;
+  return getBookPropValueSet(&Book::getPublisher);
 }
 
 const std::vector<kiwix::Bookmark> Library::getBookmarks(bool onlyValidBookmarks) const

src/opds_dumper.cpp

@@ -22,6 +22,7 @@
 
 #include "kiwixlib-resources.h"
 #include <mustache.hpp>
+#include <unicode/locid.h>
 
 #include "tools/stringTools.h"
 #include "tools/otherTools.h"
@@ -83,6 +84,15 @@ BookData getBookData(const Library* library, const std::vector<std::string>& boo
   return bookData;
 }
 
+std::string getLanguageSelfName(const std::string& lang) {
+  const icu::Locale locale(lang.c_str());
+  icu::UnicodeString ustring;
+  locale.getDisplayLanguage(locale, ustring);
+  std::string result;
+  ustring.toUTF8String(result);
+  return result;
+};
+
 } // unnamed namespace
 
 string OPDSDumper::dumpOPDSFeed(const std::vector<std::string>& bookIds, const std::string& query) const
@@ -121,11 +131,11 @@ string OPDSDumper::dumpOPDSFeedV2(const std::vector<std::string>& bookIds, const
   return render_template(RESOURCE::templates::catalog_v2_entries_xml, template_data);
 }
 
-std::string OPDSDumper::categoriesOPDSFeed(const std::vector<std::string>& categories) const
+std::string OPDSDumper::categoriesOPDSFeed() const
 {
   const auto now = gen_date_str();
   kainjow::mustache::list categoryData;
-  for ( const auto& category : categories ) {
+  for ( const auto& category : library->getBooksCategories() ) {
     const auto urlencodedCategoryName = urlEncode(category);
     categoryData.push_back(kainjow::mustache::object{
       {"name", category},
@@ -146,4 +156,32 @@ std::string OPDSDumper::categoriesOPDSFeed(const std::vector<std::string>& categ
   );
 }
 
+std::string OPDSDumper::languagesOPDSFeed() const
+{
+  const auto now = gen_date_str();
+  kainjow::mustache::list languageData;
+  for ( const auto& langAndBookCount : library->getBooksLanguagesWithCounts() ) {
+    const std::string languageCode = langAndBookCount.first;
+    const int bookCount = langAndBookCount.second;
+    const auto languageSelfName = getLanguageSelfName(languageCode);
+    languageData.push_back(kainjow::mustache::object{
+      {"lang_code",  languageCode},
+      {"lang_self_name", languageSelfName},
+      {"book_count", to_string(bookCount)},
+      {"updated", now},
+      {"id", gen_uuid(libraryId + "/languages/" + languageCode)}
+    });
+  }
+
+  return render_template(
+             RESOURCE::templates::catalog_v2_languages_xml,
+             kainjow::mustache::object{
+               {"date", now},
+               {"endpoint_root", rootLocation + "/catalog/v2"},
+               {"feed_id", gen_uuid(libraryId + "/languages")},
+               {"languages", languageData }
+             }
+  );
+}
+
 }

src/server/internalServer.h

@@ -77,6 +77,7 @@ class InternalServer {
     std::unique_ptr<Response> handle_catalog_v2_root(const RequestContext& request);
     std::unique_ptr<Response> handle_catalog_v2_entries(const RequestContext& request);
     std::unique_ptr<Response> handle_catalog_v2_categories(const RequestContext& request);
+    std::unique_ptr<Response> handle_catalog_v2_languages(const RequestContext& request);
     std::unique_ptr<Response> handle_meta(const RequestContext& request);
     std::unique_ptr<Response> handle_search(const RequestContext& request);
     std::unique_ptr<Response> handle_suggest(const RequestContext& request);

src/server/internalServer_catalog_v2.cpp

@@ -59,6 +59,8 @@ std::unique_ptr<Response> InternalServer::handle_catalog_v2(const RequestContext
     return handle_catalog_v2_entries(request);
   } else if (url == "categories") {
     return handle_catalog_v2_categories(request);
+  } else if (url == "languages") {
+    return handle_catalog_v2_languages(request);
   } else {
     return Response::build_404(*this, request, "", "");
   }
@@ -74,7 +76,8 @@ std::unique_ptr<Response> InternalServer::handle_catalog_v2_root(const RequestCo
                {"endpoint_root", m_root + "/catalog/v2"},
                {"feed_id", gen_uuid(m_library_id)},
                {"all_entries_feed_id", gen_uuid(m_library_id + "/entries")},
-               {"category_list_feed_id", gen_uuid(m_library_id + "/categories")}
+               {"category_list_feed_id", gen_uuid(m_library_id + "/categories")},
+               {"language_list_feed_id", gen_uuid(m_library_id + "/languages")}
              },
              "application/atom+xml;profile=opds-catalog;kind=navigation"
   );
@@ -101,7 +104,19 @@ std::unique_ptr<Response> InternalServer::handle_catalog_v2_categories(const Req
   opdsDumper.setLibraryId(m_library_id);
   return ContentResponse::build(
              *this,
-             opdsDumper.categoriesOPDSFeed(mp_library->getBooksCategories()),
+             opdsDumper.categoriesOPDSFeed(),
+             "application/atom+xml;profile=opds-catalog;kind=navigation"
+  );
+}
+
+std::unique_ptr<Response> InternalServer::handle_catalog_v2_languages(const RequestContext& request)
+{
+  OPDSDumper opdsDumper(mp_library);
+  opdsDumper.setRootLocation(m_root);
+  opdsDumper.setLibraryId(m_library_id);
+  return ContentResponse::build(
+             *this,
+             opdsDumper.languagesOPDSFeed(),
              "application/atom+xml;profile=opds-catalog;kind=navigation"
   );
 }

static/resources_list.txt

@@ -48,5 +48,6 @@ templates/catalog_entries.xml
 templates/catalog_v2_root.xml
 templates/catalog_v2_entries.xml
 templates/catalog_v2_categories.xml
+templates/catalog_v2_languages.xml
 opensearchdescription.xml
 catalog_v2_searchdescription.xml

static/templates/catalog_v2_languages.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<feed xmlns="http://www.w3.org/2005/Atom"
+      xmlns:dc="http://purl.org/dc/terms/"
+      xmlns:opds="https://specs.opds.io/opds-1.2">
+  <id>{{feed_id}}</id>
+  <link rel="self"
+        href="{{endpoint_root}}/languages"
+        type="application/atom+xml;profile=opds-catalog;kind=navigation"/>
+  <link rel="start"
+        href="{{endpoint_root}}/root.xml"
+        type="application/atom+xml;profile=opds-catalog;kind=navigation"/>
+  <title>List of languages</title>
+  <updated>{{date}}</updated>
+
+  {{#languages}}
+  <entry>
+    <title>{{lang_self_name}}</title>
+    <dc:language>{{{lang_code}}}</dc:language>
+    <thr:count>{{book_count}}</thr:count>
+    <link rel="subsection"
+          href="{{endpoint_root}}/entries?lang={{{lang_code}}}"
+          type="application/atom+xml;profile=opds-catalog;kind=acquisition"/>
+    <updated>{{updated}}</updated>
+    <id>{{id}}</id>
+  </entry>
+  {{/languages}}
+</feed>

static/templates/catalog_v2_root.xml

@@ -32,4 +32,13 @@
     <id>{{category_list_feed_id}}</id>
     <content type="text">List of all categories in this catalog.</content>
   </entry>
+  <entry>
+    <title>List of languages</title>
+    <link rel="subsection"
+          href="{{endpoint_root}}/languages"
+          type="application/atom+xml;profile=opds-catalog;kind=navigation"/>
+    <updated>{{date}}</updated>
+    <id>{{language_list_feed_id}}</id>
+    <content type="text">List of all languages in this catalog.</content>
+  </entry>
 </feed>

test/data/library.xml

@@ -21,11 +21,11 @@
         url="https://github.com/kiwix/libkiwix/raw/master/test/data/zimfile.zim"
         title="Ray (uncategorized) Charles"
         description="No category is assigned to this library entry."
-        language="eng"
+        language="rus"
         creator="Wikipedia"
         publisher="Kiwix"
         date="2020-03-31"
-        name="wikipedia_en_ray_charles"
+        name="wikipedia_ru_ray_charles"
         tags="unittest;wikipedia;_pictures:no;_videos:no;_details:no"
         articleCount="284"
         mediaCount="2"
@@ -37,11 +37,11 @@
         url="https://github.com/kiwix/libkiwix/raw/master/test/data/zimfile.zim"
         title="Charles, Ray"
         description="Wikipedia articles about Ray Charles"
-        language="eng"
+        language="fra"
         creator="Wikipedia"
         publisher="Kiwix"
         date="2020-03-31"
-        name="wikipedia_en_ray_charles"
+        name="wikipedia_fr_ray_charles"
         tags="unittest;wikipedia;_category:jazz;_pictures:no;_videos:no;_details:no;_ftindex:yes"
         articleCount="284"
         mediaCount="2"

test/library.cpp

@@ -275,9 +275,25 @@ TEST_F(LibraryTest, getBookMarksTest)
 TEST_F(LibraryTest, sanityCheck)
 {
   EXPECT_EQ(lib.getBookCount(true, true), 12U);
-  EXPECT_EQ(lib.getBooksLanguages().size(), 3U);
-  EXPECT_EQ(lib.getBooksCreators().size(), 9U);
-  EXPECT_EQ(lib.getBooksPublishers().size(), 3U);
+  EXPECT_EQ(lib.getBooksLanguages(),
+            std::vector<std::string>({"deu", "eng", "fra"})
+  );
+  EXPECT_EQ(lib.getBooksCreators(), std::vector<std::string>({
+      "Islam Stack Exchange",
+      "Movies & TV Stack Exchange",
+      "Mythology & Folklore Stack Exchange",
+      "TED",
+      "Tania Louis",
+      "Wiki",
+      "Wikibooks",
+      "Wikipedia",
+      "Wikiquote"
+  }));
+  EXPECT_EQ(lib.getBooksPublishers(), std::vector<std::string>({
+      "",
+      "Kiwix",
+      "Kiwix & Some Enthusiasts"
+  }));
 }
 
 TEST_F(LibraryTest, categoryHandling)