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ebookbuild.py
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ebookbuild.py
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#!/usr/bin/env python
#ebookbuild.py v0.8115 - Generates an ePub file using data from the metadata.json.
#This file is part of the ebookbuild project (also known as Project Zylon) which is licensed under GNU General Public License v3.0 (GNU GPLv3): https://www.gnu.org/licenses/gpl-3.0.en.html
#opf = "OEBPS/content.opf"
#ncx = "OEBPS/toc.ncx"
import os
import datetime, time
import json
from collections import OrderedDict
import re
import zipfile
import hashlib
#Intro text
print()
print("================================================")
print("ebookbuild, v0.8115 - Copyright (C) 2021 Hal Motley")
print("https://github.com/inferno986return/ebookbuild/")
print()
print("This program comes with ABSOLUTELY NO WARRANTY, for details see GPL-3.txt.")
print("This is free software and you are welcome to redistribute it under certain conditions.")
print("================================================")
print()
#JSON extraction magic
with open("metadata.json") as json_file:
data = json.load((json_file), object_pairs_hook=OrderedDict) #For some reason the order is randomised, this preserves the order.
#Create a compatible content.opf from scratch.
def GenOPF():
utctime = datetime.datetime.utcnow().replace(microsecond=0).isoformat()
opf = open(data["containerFolder"] + os.sep + "content.opf", "w", encoding="utf-8")
opf.write('<?xml version="1.0" encoding="UTF-8" standalone="no"?>')
opf.write('<package xmlns="http://www.idpf.org/2007/opf" unique-identifier="bookid" version="2.0">\n')
#Metadata tags
opf.write('\t<metadata xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:opf="http://www.idpf.org/2007/opf">\n')
opf.write('\t\t<dc:title>' + data["title"] + '</dc:title>\n')
opf.write('\t\t<dc:creator>' + data["creator"] + '</dc:creator>\n')
opf.write('\t\t<dc:subject>' + data["subject"] + '</dc:subject>\n')
opf.write('\t\t<dc:publisher>' + data["publisher"] + '</dc:publisher>\n')
opf.write('\t\t<dc:identifier id="bookid">' + data["ISBN"] + '</dc:identifier>\n')
opf.write('\t\t<dc:date>' + utctime + '</dc:date>\n') #Date and time using ISO 8601 to ensure a unique checksum (YYYY-MM-DDThh:mm:ss)
opf.write('\t\t<dc:language>' + data["language"] + '</dc:language>\n')
opf.write('\t\t<dc:rights>' + data["rights"] + '</dc:rights>\n')
opf.write('\t\t<meta content="cover" name="cover"/>\n')
#Fixed (non-reflowable) support
if (data["textPresentation"] == "Reflowable" or data["textPresentation"] == "reflowable" or data["textPresentation"] == "reflow"):
print('e-book type: Reflowable')
elif (data["textPresentation"] == "Fixed layout" or data["textPresentation"] == "Fixed Layout" or data["textPresentation"] == "fixed layout" or data["textPresentation"] == "fixed"):
opf.write('\t\t<meta name="fixed-layout" content="true"/>\n')
print('e-book type: Fixed layout')
else:
print('Invalid textPresentation in metadata.json.')
opf.write('\t</metadata>\n')
#Manifest tags
opf.write('\t<manifest>\n')
#Write out the CSS files
cssindex = 0
for subdir, dirs, files in os.walk(data["containerFolder"] + os.sep + data["cssFolder"]):
for file in files:
filepath = subdir + os.sep + file
correctfilepath = filepath.replace(data["containerFolder"] + os.sep, "") #removes the redudant OEBPS
if filepath.endswith(".css"):
opf.write('\t\t<item href="' + correctfilepath + '" id="css' + str(cssindex) + '" media-type="text/css"/>\n')
print (filepath)
cssindex += 1
#Write out the NCX and cover image files
opf.write('\t\t<item href="toc.ncx" id="ncx" media-type="application/x-dtbncx+xml"/>\n')
#opf.write('\t\t<item href="'+ data["imagesFolder"] + '/' + data["epubCover"] +'" id="main_cover_image" media-type="image/jpeg"/>\n') #Removes duplicate output, leaving commented as I might it later for the Kindle covers.
#Write out the images
imageindex = 0
for subdir, dirs, files in os.walk(data["containerFolder"] + os.sep + data["imagesFolder"]):
for file in files:
filepath = subdir + os.sep + file
correctfilepath = filepath.replace(data["containerFolder"] + os.sep, "") #removes the redudant OEBPS
if file == data["epubCover"]:
if filepath.endswith(".jpg") or filepath.endswith(".jpeg") or filepath.endswith(".jpe"):
opf.write('\t\t<item href="' + correctfilepath + '" id="cover" media-type="image/jpeg"/>\n')
print (filepath)
elif filepath.endswith(".png"):
opf.write('\t\t<item href="' + correctfilepath + '" id="cover" media-type="image/png"/>\n')
print (filepath)
elif filepath.endswith(".gif"):
opf.write('\t\t<item href="' + correctfilepath + '" id="cover" media-type="image/gif"/>\n')
print (filepath)
imageindex += 1
elif filepath.endswith(".svg"):
opf.write('\t\t<item href="' + correctfilepath + '" id="cover" media-type="image/svg+xml"/>\n')
print (filepath)
if file != data["epubCover"]:
if filepath.endswith(".jpg") or filepath.endswith(".jpeg") or filepath.endswith(".jpe"):
opf.write('\t\t<item href="' + correctfilepath + '" id="image' + str(imageindex) + '" media-type="image/jpeg"/>\n')
print (filepath)
imageindex += 1
elif filepath.endswith(".png"):
opf.write('\t\t<item href="' + correctfilepath + '" id="image' + str(imageindex) + '" media-type="image/png"/>\n')
print (filepath)
imageindex += 1
elif filepath.endswith(".gif"):
opf.write('\t\t<item href="' + correctfilepath + '" id="image' + str(imageindex) + '" media-type="image/gif"/>\n')
print (filepath)
imageindex += 1
elif filepath.endswith(".svg"):
opf.write('\t\t<item href="' + correctfilepath + '" id="image' + str(imageindex) + '" media-type="image/svg+xml"/>\n')
print (filepath)
imageindex += 1
#Write out all the pages in the book.
#Count all the instances within the pages block.
currentpage = 0
totalpages = len(data["pages"]) #Number of pages
while currentpage != totalpages: #Write out all the xhtml files as declared in the JSON.
pageid = data["pages"][currentpage]["fileName"] #remove capital letters and spaces from the id attribute (works with Unicode)
correctpageid = pageid.replace(".xhtml","")
#Need to remove invalid characters such as numbers and hyphens from id. This does work, though files shouldn't start with numbers anyway.
if re.match(r"^\d+", correctpageid):
correctpageid = re.sub(r"^\d+", "", correctpageid)
if re.match(r"\-", correctpageid):
correctpageid = re.sub(r"\-", "", correctpageid)
opf.write('\t\t<item href="' + data["pages"][currentpage]["fileName"] + '" id="' + correctpageid + '" media-type="application/xhtml+xml"/>\n')
currentpage += 1
#Write out all the custom fonts in the book.
fontindex = 0
for subdir, dirs, files in os.walk(data["containerFolder"] + os.sep + data["fontsFolder"]):
for file in files:
filepath = subdir + os.sep + file
correctfilepath = filepath.replace(data["containerFolder"] + os.sep, "") #removes the redudant OEBPS
if filepath.endswith(".ttf"):
opf.write('\t\t<item href="' + correctfilepath + '" id="font' + str(fontindex) + '" media-type="font/truetype"/>\n')
print (filepath)
fontindex += 1
elif filepath.endswith(".otf"):
opf.write('\t\t<item href="' + correctfilepath + '" id="font' + str(fontindex) + '" media-type="font/opentype"/>\n')
print (filepath)
fontindex += 1
opf.write('\t</manifest>\n')
#Spine tags
opf.write('\t<spine toc="ncx">\n')
#Write out all the filenames in order again as declared in the JSON.
currentpage = 0
totalpages = len(data["pages"]) #Number of pages
while currentpage != totalpages: #Write out all the xhtml files as declared in the JSON.
pageid = data["pages"][currentpage]["fileName"] #remove capital letters and spaces from the id attribute (works with Unicode)
correctpageid = pageid.replace(".xhtml", "") #pageid.replace(" & ", " "), pageid.replace("'", """), pageid.replace('"', "&dquot;"), pageid.replace('<', "<"), pageid.replace('>', ">") #Remove the characters disallowed for ID in XML.
#Need to remove invalid characters such as numbers and hyphens from id. This does work, though files shouldn't start with numbers anyway.
if re.match(r"^\d+", correctpageid):
correctpageid = re.sub(r"^\d+", "", correctpageid)
if re.match(r"\-", correctpageid):
correctpageid = re.sub(r"\-", "", correctpageid)
opf.write('\t\t<itemref idref="' + correctpageid + '"/>\n')
currentpage += 1
opf.write('\t</spine>\n')
#End of file
opf.write('</package>')
#Eventually save directly to the OEBPS folder
opf.close()
#Create a compatible toc.ncx from scratch.
def GenNCX():
ncx = open(data["containerFolder"] + os.sep + "toc.ncx", "w", encoding="utf-8")
ncx.write('<?xml version="1.0" encoding="UTF-8" ?>\n')
ncx.write('<!DOCTYPE ncx PUBLIC "-//NISO//DTD ncx 2005-1//EN" "http://www.daisy.org/z3986/2005/ncx-2005-1.dtd"><ncx xmlns="http://www.daisy.org/z3986/2005/ncx/" version="2005-1">\n')
#Head tags
ncx.write('<head>\n')
ncx.write('\t<meta name="dtb:uid" content="' + data["ISBN"] + '" />\n') #Has to be the same as dc:identifier.
#Declare the maximum amount of indentation from 1 to 4.
indentations = [] #Assemble a Python list (array) with all the indentations and take the largest number.
currentpage = 0
totalpages = len(data["pages"]) #Number of pages
while currentpage != totalpages:
indentations.append(data["pages"][currentpage]["indentation"])
maxdepth = max(indentations)
currentpage += 1
ncx.write('\t<meta name="dtb:depth" content="' + str(maxdepth) + '" />\n')
ncx.write('\t<meta name="dtb:totalPageCount" content="0" />\n')
ncx.write('\t<meta name="dtb:maxPageNumber" content="0" />\n')
ncx.write('</head>\n')
#Doctitle tags
ncx.write('<docTitle>\n')
ncx.write('\t<text>' + data["titleShort"] + '</text>\n')
ncx.write('</docTitle>\n')
#Write out the NavMap tags (and their children)
ncx.write('<navMap>\n')
currentpage = 0
index = 1
totalpages = len(data["pages"]) #Number of pages
while currentpage != totalpages: #Write out all the xhtml files as declared in the JSON, indendation currently unsupported (data["pages"][currentpage]["indentation"].
ncx.write('\t<navPoint id="navpoint-' + str(index) + '" playOrder="' + str(index) + '">\n') #id=001 class=h1 playOrder=1
ncx.write('\t\t<navLabel>\n')
ncx.write('\t\t\t<text>' + data["pages"][currentpage]["pageName"] + '</text>\n')
ncx.write('\t\t</navLabel>\n')
ncx.write('\t\t<content src="' + data["pages"][currentpage]["fileName"] + '" />\n')
#Write out the page's anchor tags.
try:
currentanchor = 0
totalanchors = len(data["pages"][currentpage]["anchorNames"])
while currentanchor != totalanchors:
index += 1
ncx.write('\t\t<navPoint id="navpoint-' + str(index) + '" playOrder="' + str(index) + '">\n') #id=001 class=h1 playOrder=1
ncx.write('\t\t\t\t<navLabel>\n')
ncx.write('\t\t\t\t\t<text>' + data["pages"][currentpage]["anchorNames"]["anchorName" + str(currentanchor) + ""] + '</text>\n')
ncx.write('\t\t\t\t</navLabel>\n')
ncx.write('\t\t\t\t<content src="'+ data["pages"][currentpage]["fileName"] + data["pages"][currentpage]["anchorLinks"]["anchorLink" + str(currentanchor) + ""] + '" />\n')
ncx.write('\t\t</navPoint>\n')
currentanchor += 1
print('Added anchor tags to page ' + str(currentpage) + ', ' + data["pages"][currentpage]["fileName"] + '.')
except KeyError:
print('Skipped page ' + str(currentpage) + ', ' + data["pages"][currentpage]["fileName"] + ' as it had no anchor tags.')
ncx.write('\t</navPoint>\n')
currentpage += 1
index += 1
ncx.write('</navMap>\n')
#End of file
ncx.write('</ncx>')
def GenEpub():
#GenEpub.py - Generates an .epub file from the data provided.
#Ideally with no errors or warnings from epubcheck (needs to be implemented, maybe with the Python wrapper).
#Generate the mimetype.
mime = open("mimetype", "w")
mime.write('application/epub+zip')
mime.close()
#Generate the META-INF.
try:
os.stat('META-INF')
except:
os.mkdir('META-INF')
metainf = open('META-INF' + os.sep + "container.xml", "w")
metainf.write('<?xml version="1.0"?>\n')
metainf.write('<container version="1.0" xmlns="urn:oasis:names:tc:opendocument:xmlns:container">\n')
metainf.write('\t<rootfiles>\n')
metainf.write('\t\t<rootfile full-path="' + data["containerFolder"] + '/content.opf" media-type="application/oebps-package+xml" />\n')
metainf.write('\t</rootfiles>\n')
metainf.write('</container>')
metainf.close()
#The ePub standard requires deflated compression and a compression order.
zf = zipfile.ZipFile(data["fileName"] + '.epub', mode='w', compression=zipfile.ZIP_STORED)
zf.write('mimetype')
for dirname, subdirs, files in os.walk('META-INF'):
zf.write(dirname)
for filename in files:
if filename != '.DS_Store': #epubcheck hates uninvited files and macOS places these everywhere.
zf.write(os.path.join(dirname, filename))
print('dirname:' + dirname)
print('filename:' + filename)
for dirname, subdirs, files in os.walk(data["containerFolder"]):
zf.write(dirname)
for filename in files:
if filename != '.DS_Store': #epubcheck hates uninvited files
zf.write(os.path.join(dirname, filename))
print('dirname:' + dirname)
print('filename:' + filename)
zf.close()
#zipfile has a built-in validator for debugging
with open(data["fileName"] + '.epub', 'r') as f:
if zipfile.is_zipfile(f) is True:
print("ZIP file is valid.")
#Extra debugging information
#print(getinfo.compress_type(zf))
#print(getinfo.compress_size(zf))
#print(getinfo.file_size(zf))
def GenChksum():
#Generate and show MD5 and SHA512 checksums for the ePub using hashlib
utctime = datetime.datetime.utcnow().replace(microsecond=0).isoformat(' ')
md5 = hashlib.md5()
sha256 = hashlib.sha256()
sha512 = hashlib.sha512()
with open(data["fileName"] + ".epub", 'rb') as afile:
buffer = afile.read()
md5.update(buffer)
sha256.update(buffer)
sha512.update(buffer)
# Seperates the checksum output from the files going into the book.
print()
print("-This output is saved to checksums.txt-")
print()
print("Checksum values for " + data["fileName"] + ".epub on " + str(utctime) + " UTC")
print("=============================================================================")
print()
print("MD5: "+ md5.hexdigest())
print("SHA-256: "+ sha256.hexdigest())
print("SHA-512: "+ sha512.hexdigest())
print()
chksum = metainf = open("checksums.txt", "w")
chksum.write("Checksum values for " + data["fileName"] + ".epub on " + str(utctime) + "UTC" + "\n")
chksum.write("=================================================================================\n")
chksum.write("\n")
chksum.write("MD5: " + md5.hexdigest() + "\n")
chksum.write("SHA-256: " + sha256.hexdigest() + "\n")
chksum.write("SHA-512: " + sha512.hexdigest() + "\n")
GenOPF()
GenNCX()
GenEpub()
GenChksum()