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Remove CDP watermark from EPUBs

This commit is contained in:
NoDRM 2021-11-16 15:23:54 +01:00
parent 9c41716e5e
commit 39f8595139
1 changed files with 84 additions and 25 deletions
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85
DeDRM_plugin/__init__.py
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@ -94,7 +94,9 @@ import sys, os, re
import time
import zipfile
import traceback
from zipfile import ZipFile
from zipfile import ZipInfo, ZipFile, ZIP_STORED, ZIP_DEFLATED
from contextlib import closing
class DeDRMError(Exception):
pass
@ -205,10 +207,66 @@ class DeDRM(FileTypePlugin):
traceback.print_exc()
raise
def postProcessEPUB(self, path_to_ebook):
# This is called after the DRM is removed (or if no DRM was present)
# It does stuff like de-obfuscating fonts (by calling checkFonts)
# or removing watermarks.
path_to_ebook = self.checkFonts(path_to_ebook)
path_to_ebook = self.removeCDPwatermarkFromEPUB(path_to_ebook)
return path_to_ebook
def removeCDPwatermarkFromEPUB(self, path_to_ebook):
# "META-INF/cdp.info" is a watermark file used by some Tolino vendors.
# We don't want that in our eBooks, so lets remove that file.
try:
infile = ZipFile(open(path_to_ebook, 'rb'))
namelist = infile.namelist()
if 'META-INF/cdp.info' not in namelist:
return path_to_ebook
namelist.remove("mimetype")
namelist.remove("META-INF/cdp.info")
output = self.temporary_file(".epub").name
kwds = dict(compression=ZIP_DEFLATED, allowZip64=False)
with closing(ZipFile(open(output, 'wb'), 'w', **kwds)) as outf:
for path in (["mimetype"] + namelist):
data = infile.read(path)
zi = ZipInfo(path)
oldzi = infile.getinfo(path)
try:
zi.compress_type = oldzi.compress_type
if path == "mimetype":
zi.compress_type = ZIP_STORED
zi.date_time = oldzi.date_time
zi.comment = oldzi.comment
zi.extra = oldzi.extra
zi.internal_attr = oldzi.internal_attr
zi.external_attr = oldzi.external_attr
zi.create_system = oldzi.create_system
if any(ord(c) >= 128 for c in path) or any(ord(c) >= 128 for c in zi.comment):
# If the file name or the comment contains any non-ASCII char, set the UTF8-flag
zi.flag_bits |= 0x800
except:
pass
outf.writestr(zi, data)
print("{0} v{1}: Successfully removed cdp.info watermark".format(PLUGIN_NAME, PLUGIN_VERSION))
return output
except:
return path_to_ebook
def checkFonts(self, path_to_ebook):
# This is called after the normal DRM removal is done.
# It checks if there's fonts that need to be deobfuscated
try:
import calibre_plugins.dedrm.prefs as prefs
dedrmprefs = prefs.DeDRM_Prefs()
@ -219,21 +277,22 @@ class DeDRM(FileTypePlugin):
ret = epubfontdecrypt.decryptFontsBook(path_to_ebook, output)
if (ret == 0):
print("Font deobfuscation successful")
return output
elif (ret == 1):
print("No font obfuscation found")
return path_to_ebook
else:
print("Errors during font deobfuscation!")
print("{0} v{1}: Error during font deobfuscation".format(PLUGIN_NAME, PLUGIN_VERSION))
raise DeDRMError("Font deobfuscation failed")
else:
return path_to_ebook
except:
print("{0} v{1}: Error during font deobfuscation".format(PLUGIN_NAME, PLUGIN_VERSION))
return path_to_ebook
def ePubDecrypt(self,path_to_ebook):
# Create a TemporaryPersistent file to work with.
# Check original epub archive for zip errors.
import calibre_plugins.dedrm.zipfix
import calibre_plugins.dedrm.zipfix as zipfix
inf = self.temporary_file(".epub")
try:
@ -275,7 +334,7 @@ class DeDRM(FileTypePlugin):
if result == 0:
# Decryption was successful.
# Return the modified PersistentTemporary file to calibre.
return self.checkFonts(of.name)
return self.postProcessEPUB(of.name)
print("{0} v{1}: Failed to decrypt with key {2:s} after {3:.1f} seconds".format(PLUGIN_NAME, PLUGIN_VERSION,keyname_masked,time.time()-self.starttime))
@ -334,7 +393,7 @@ class DeDRM(FileTypePlugin):
print("{0} v{1}: Exception saving a new default key after {2:.1f} seconds".format(PLUGIN_NAME, PLUGIN_VERSION, time.time()-self.starttime))
traceback.print_exc()
# Return the modified PersistentTemporary file to calibre.
return self.checkFonts(of.name)
return self.postProcessEPUB(of.name)
print("{0} v{1}: Failed to decrypt with new default key after {2:.1f} seconds".format(PLUGIN_NAME, PLUGIN_VERSION,time.time()-self.starttime))
except Exception as e:
@ -377,10 +436,10 @@ class DeDRM(FileTypePlugin):
of.close()
if result == 0:
print("{0} v{1}: Decrypted with key {2:s} after {3:.1f} seconds".format(PLUGIN_NAME, PLUGIN_VERSION,keyname,time.time()-self.starttime))
return self.checkFonts(of.name)
return self.postProcessEPUB(of.name)
except ineptepub.ADEPTNewVersionError:
print("{0} v{1}: Book uses unsupported (too new) Adobe DRM.".format(PLUGIN_NAME, PLUGIN_VERSION, time.time()-self.starttime))
return path_to_ebook
return self.postProcessEPUB(path_to_ebook)
except:
print("{0} v{1}: Exception when decrypting after {2:.1f} seconds - trying other keys".format(PLUGIN_NAME, PLUGIN_VERSION, time.time()-self.starttime))
@ -398,7 +457,7 @@ class DeDRM(FileTypePlugin):
result = ineptepub.decryptBook(userkey, inf.name, of.name)
except ineptepub.ADEPTNewVersionError:
print("{0} v{1}: Book uses unsupported (too new) Adobe DRM.".format(PLUGIN_NAME, PLUGIN_VERSION, time.time()-self.starttime))
return path_to_ebook
return self.postProcessEPUB(path_to_ebook)
except:
print("{0} v{1}: Exception when decrypting after {2:.1f} seconds".format(PLUGIN_NAME, PLUGIN_VERSION, time.time()-self.starttime))
traceback.print_exc()
@ -413,7 +472,7 @@ class DeDRM(FileTypePlugin):
# Decryption was successful.
# Return the modified PersistentTemporary file to calibre.
print("{0} v{1}: Decrypted with key {2:s} after {3:.1f} seconds".format(PLUGIN_NAME, PLUGIN_VERSION,keyname,time.time()-self.starttime))
return self.checkFonts(of.name)
return self.postProcessEPUB(of.name)
print("{0} v{1}: Failed to decrypt with key {2:s} after {3:.1f} seconds".format(PLUGIN_NAME, PLUGIN_VERSION,keyname,time.time()-self.starttime))
@ -481,7 +540,7 @@ class DeDRM(FileTypePlugin):
traceback.print_exc()
print("{0} v{1}: Decrypted with new default key after {2:.1f} seconds".format(PLUGIN_NAME, PLUGIN_VERSION,time.time()-self.starttime))
# Return the modified PersistentTemporary file to calibre.
return self.checkFonts(of.name)
return self.postProcessEPUB(of.name)
print("{0} v{1}: Failed to decrypt with new default key after {2:.1f} seconds".format(PLUGIN_NAME, PLUGIN_VERSION,time.time()-self.starttime))
except Exception as e:
@ -496,7 +555,7 @@ class DeDRM(FileTypePlugin):
# Not a Barnes & Noble nor an Adobe Adept
# Probably a DRM-free EPUB, but we should still check for fonts.
print("{0} v{1}: “{2}” is neither an Adobe Adept nor a Barnes & Noble encrypted ePub".format(PLUGIN_NAME, PLUGIN_VERSION, os.path.basename(path_to_ebook)))
return self.checkFonts(inf.name)
return self.postProcessEPUB(inf.name)
#raise DeDRMError("{0} v{1}: Couldn't decrypt after {2:.1f} seconds. DRM free perhaps?".format(PLUGIN_NAME, PLUGIN_VERSION,time.time()-self.starttime))
def PDFDecrypt(self,path_to_ebook):