feat: support kepub files in web reader

AFAICT kepub files are compliant with the EPUB specification. In limited testing, the epub reader seems to handle them just fine.

Author: shavitmichael

cps/helper.py

@@ -206,7 +206,7 @@ def check_send_to_ereader(entry):
 # Check if a reader is existing for any of the book formats, if not, return empty list, otherwise return
 # list with supported formats
 def check_read_formats(entry):
-    extensions_reader = {'TXT', 'PDF', 'EPUB', 'CBZ', 'CBT', 'CBR', 'DJVU', 'DJV'}
+    extensions_reader = {'TXT', 'PDF', 'EPUB', 'KEPUB', 'CBZ', 'CBT', 'CBR', 'DJVU', 'DJV'}
     book_formats = list()
     if len(entry.data):
         for ele in iter(entry.data):

cps/templates/read.html

@@ -127,8 +127,8 @@ <h3>{{_('Settings')}}</h3>
         window.calibre = {
             filePath: "{{ url_for('static', filename='js/libs/') }}",
             cssPath: "{{ url_for('static', filename='css/') }}",
-            bookmarkUrl: "{{ url_for('web.set_bookmark', book_id=bookid, book_format='EPUB') }}",
-            bookUrl: "{{ url_for('web.serve_book', book_id=bookid, book_format='epub', anyname='file.epub') }}",
+            bookmarkUrl: "{{ url_for('web.set_bookmark', book_id=bookid, book_format=book_format|upper) }}",
+            bookUrl: "{{ url_for('web.serve_book', book_id=bookid, book_format=book_format, anyname='file.epub') }}",
             bookmark: "{{ bookmark.bookmark_key if bookmark != None }}",
             useBookmarks: "{{ current_user.is_authenticated | tojson }}",
             kosyncPercent: {{ kosync_progress | tojson if kosync_progress is not none else 'null' }}

cps/web.py

@@ -1908,7 +1908,7 @@ def serve_book(book_id, book_format, anyname):
             log.error_or_exception(ex)
             return "File Not Found"
     else:
-        if book_format.upper() == 'EPUB':
+        if book_format.upper() in ('EPUB', 'KEPUB'):
             original_path = os.path.join(config.get_book_path(), book.path, data.name + "." + book_format)
             fixed_path = _repair_epub_container_if_needed(book_id, original_path)
             if fixed_path:
@@ -2845,10 +2845,11 @@ def read_book(book_id, book_format):
         except Exception as e:
             log.debug(f"Failed to log read activity: {e}")
 
-    if book_format.lower() == "epub":
-        log.debug("Start epub reader for %d", book_id)
+    if book_format.lower() in ("epub", "kepub"):
+        log.debug("Start epub reader for %d (%s)", book_id, book_format.lower())
         return render_title_template('read.html', bookid=book_id, title=book.title,
-                                     bookmark=bookmark, kosync_progress=kosync_progress)
+                                     bookmark=bookmark, kosync_progress=kosync_progress,
+                                     book_format=book_format.lower())
     elif book_format.lower() == "pdf":
         log.debug("Start pdf reader for %d", book_id)
         return render_title_template('readpdf.html', pdffile=book_id, title=book.title)