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Improved cover extraction for epub files

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This commit is contained in:
Ozzie Isaacs
2022-03-12 18:01:11 +01:00
parent 4379669cf8
commit 8e2536c53b
3 changed files with 95 additions and 66 deletions
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35
cps/epub.py
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@@ -20,23 +20,26 @@ import os
import zipfile
from lxml import etree
from . import isoLanguages
from . import isoLanguages, cover
from .helper import split_authors
from .constants import BookMeta
def extract_cover(zip_file, cover_file, cover_path, tmp_file_name):
def _extract_cover(zip_file, cover_file, cover_path, tmp_file_name):
if cover_file is None:
return None
else:
cf = extension = None
zip_cover_path = os.path.join(cover_path, cover_file).replace('\\', '/')
cf = zip_file.read(zip_cover_path)
prefix = os.path.splitext(tmp_file_name)[0]
tmp_cover_name = prefix + '.' + os.path.basename(zip_cover_path)
image = open(tmp_cover_name, 'wb')
image.write(cf)
image.close()
return tmp_cover_name
ext = os.path.splitext(tmp_cover_name)
if len(ext) > 1:
extension = ext[1].lower()
if extension in cover.COVER_EXTENSIONS:
cf = zip_file.read(zip_cover_path)
return cover.cover_processing(tmp_file_name, cf, extension)
def get_epub_info(tmp_file_path, original_file_name, original_file_extension):
@@ -70,9 +73,9 @@ def get_epub_info(tmp_file_path, original_file_name, original_file_extension):
else:
epub_metadata[s] = tmp[0]
else:
epub_metadata[s] = u'Unknown'
epub_metadata[s] = 'Unknown'
if epub_metadata['subject'] == u'Unknown':
if epub_metadata['subject'] == 'Unknown':
epub_metadata['subject'] = ''
if epub_metadata['description'] == u'Unknown':
@@ -112,7 +115,7 @@ def parse_epub_cover(ns, tree, epub_zip, cover_path, tmp_file_path):
cover_section = tree.xpath("/pkg:package/pkg:manifest/pkg:item[@id='cover-image']/@href", namespaces=ns)
cover_file = None
if len(cover_section) > 0:
cover_file = extract_cover(epub_zip, cover_section[0], cover_path, tmp_file_path)
cover_file = _extract_cover(epub_zip, cover_section[0], cover_path, tmp_file_path)
else:
meta_cover = tree.xpath("/pkg:package/pkg:metadata/pkg:meta[@name='cover']/@content", namespaces=ns)
if len(meta_cover) > 0:
@@ -123,10 +126,10 @@ def parse_epub_cover(ns, tree, epub_zip, cover_path, tmp_file_path):
"/pkg:package/pkg:manifest/pkg:item[@properties='" + meta_cover[0] + "']/@href", namespaces=ns)
else:
cover_section = tree.xpath("/pkg:package/pkg:guide/pkg:reference/@href", namespaces=ns)
if len(cover_section) > 0:
filetype = cover_section[0].rsplit('.', 1)[-1]
for cs in cover_section:
filetype = cs.rsplit('.', 1)[-1]
if filetype == "xhtml" or filetype == "html": # if cover is (x)html format
markup = epub_zip.read(os.path.join(cover_path, cover_section[0]))
markup = epub_zip.read(os.path.join(cover_path, cs))
markup_tree = etree.fromstring(markup)
# no matter xhtml or html with no namespace
img_src = markup_tree.xpath("//*[local-name() = 'img']/@src")
@@ -137,9 +140,11 @@ def parse_epub_cover(ns, tree, epub_zip, cover_path, tmp_file_path):
# img_src maybe start with "../"" so fullpath join then relpath to cwd
filename = os.path.relpath(os.path.join(os.path.dirname(os.path.join(cover_path, cover_section[0])),
img_src[0]))
cover_file = extract_cover(epub_zip, filename, "", tmp_file_path)
cover_file = _extract_cover(epub_zip, filename, "", tmp_file_path)
else:
cover_file = extract_cover(epub_zip, cover_section[0], cover_path, tmp_file_path)
cover_file = _extract_cover(epub_zip, cs, cover_path, tmp_file_path)
if cover_file:
break
return cover_file