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Automatic commit Fri May 27 05:57:21 PM EEST 2022
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‎epub/epub-show-cover.py

Lines changed: 87 additions & 25 deletions
Original file line numberDiff line numberDiff line change
@@ -15,6 +15,7 @@
1515
"opf":"http://www.idpf.org/2007/opf",
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"u":"urn:oasis:names:tc:opendocument:xmlns:container",
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"xsi":"http://www.w3.org/2001/XMLSchema-instance",
18+
"xhtml":"http://www.w3.org/1999/xhtml"
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}
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2021

@@ -40,32 +41,90 @@ def get_epub_cover(epub_path):
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# We load the "root" file, indicated by the "full_path" attribute of "META-INF/container.xml", using lxml.etree.fromString():
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t = etree.fromstring(z.read(rootfile_path))
43-
# We use xpath() to find the attribute "content":
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'''
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<metadata xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:opf="http://www.idpf.org/2007/opf">
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...
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<meta content="my-cover-image" name="cover"/>
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...
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</metadata>
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'''
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cover_id = t.xpath("//opf:metadata/opf:meta[@name='cover']",
52-
namespaces=namespaces)[0].get("content")
53-
print("ID of cover image found: " + cover_id)
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cover_href = None
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try:
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# For EPUB 2.0, we use xpath() to find a <meta>
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# named "cover" and get the attribute "content":
49+
'''
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<metadata xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:opf="http://www.idpf.org/2007/opf">
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...
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<meta content="my-cover-image" name="cover"/>
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...
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</metadata> '''
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cover_id = t.xpath("//opf:metadata/opf:meta[@name='cover']",
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namespaces=namespaces)[0].get("content")
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print("ID of cover image found: " + cover_id)
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# Next, we use xpath() to find the <item> (in <manifest>) with this id
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# and get the attribute "href":
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'''
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<manifest>
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...
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<item id="my-cover-image" href="images/978.jpg" ... />
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...
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</manifest>
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'''
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cover_href = t.xpath("//opf:manifest/opf:item[@id='" + cover_id + "']",
69+
namespaces=namespaces)[0].get("href")
70+
except IndexError:
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pass
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55-
# We use xpath() to find the attribute "href":
56-
'''
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<manifest>
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...
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<item id="my-cover-image" href="images/978.jpg" ... />
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...
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</manifest>
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'''
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cover_href = t.xpath("//opf:manifest/opf:item[@id='" + cover_id + "']",
64-
namespaces=namespaces)[0].get("href")
65-
# In order to get the full path for the cover image, we have to join rootfile_path and cover_href:
73+
if not cover_href:
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# For EPUB 3.0, We use xpath to find the <item> (in <manifest>) that
75+
# has properties='cover-image' and get the attribute "href":
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'''
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<manifest>
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...
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<item href="images/cover.png" id="cover-img" media-type="image/png" properties="cover-image"/>
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...
81+
</manifest>
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'''
83+
try:
84+
cover_href = t.xpath("//opf:manifest/opf:item[@properties='cover-image']",
85+
namespaces=namespaces)[0].get("href")
86+
except IndexError:
87+
pass
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89+
if not cover_href:
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# Some EPUB files do not declare explicitly a cover image.
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# Instead, they use an "<img src=''>" inside the first xhmtl file.
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try:
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# The <spine> is a list that defines the linear reading order
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# of the content documents of the book. The first item in the
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# list is the first item in the book.
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'''
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<spine toc="ncx">
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<itemref idref="cover"/>
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<itemref idref="nav"/>
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<itemref idref="s04"/>
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</spine>
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'''
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cover_page_id = t.xpath("//opf:spine/opf:itemref",
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namespaces=namespaces)[0].get("idref")
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# Next, we use xpath() to find the item (in manifest) with this id
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# and get the attribute "href":
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cover_page_href = t.xpath("//opf:manifest/opf:item[@id='" + cover_page_id + "']",
108+
namespaces=namespaces)[0].get("href")
109+
# In order to get the full path for the cover page,
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# we have to join rootfile_path and cover_page_href:
111+
cover_page_path = os.path.join(os.path.dirname(rootfile_path), cover_page_href)
112+
print("Path of cover page found: " + cover_page_path)
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# We try to find the <img> and get the "src" attribute:
114+
t = etree.fromstring(z.read(cover_page_path))
115+
cover_href = t.xpath("//xhtml:img", namespaces=namespaces)[0].get("src")
116+
except IndexError:
117+
pass
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119+
if not cover_href:
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print("Cover image not found.")
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return None
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# In order to get the full path for the cover image,
124+
# we have to join rootfile_path and cover_href:
66125
cover_path = os.path.join(os.path.dirname(rootfile_path), cover_href)
67-
print("Path of cover image found: " + cover_path)
68-
126+
print("Path of cover image found: " + cover_path)
127+
69128
# We return the image
70129
return z.open(cover_path)
71130

@@ -79,7 +138,10 @@ def get_epub_cover(epub_path):
79138
print("File not found: " + epubfile)
80139
exit()
81140

82-
image = Image.open(get_epub_cover(epubfile))
141+
cover = get_epub_cover(epubfile)
142+
if not cover:
143+
exit()
144+
image = Image.open(cover)
83145
image.show()
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