/
eml2str.py
978 lines (870 loc) · 38.2 KB
/
eml2str.py
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import io
import codecs
import re
import zipfile
from binascii import a2b_qp,a2b_base64
from html import unescape # https://docs.python.org/3/library/html.html
try:
from striprtf import rtf_to_text
rtf_support=True
except:
rtf_support=False
try:
from tnefparse import TNEF
tnef_support=1 # TNEF/HTML support
# if rtf_support:
# try:
# import compressed_rtf
# tnef_support=2 # TNEF/RTF support
# except:
# pass
except:
tnef_support=0
charset_mapping = {
'cp-850': 'cp850',
'_iso-2022-jp$esc': 'iso-2022-jp',
'windows-874': 'cp874',
'x-mac-ce': 'maccentraleurope',
'iso-8859-8-i': 'iso-8859-8',
'utf8': 'utf-8',
'unicode-1-1-utf-8': 'utf-8',
'utf-16': 'utf-16le',
# source: /usr/local/lib/python3.10/dist-packages/webencodings/labels.py
'866': 'ibm866',
'cp866': 'ibm866',
'csibm866': 'ibm866',
'csisolatin2': 'iso-8859-2',
'iso-ir-101': 'iso-8859-2',
'iso-88-2': 'iso-8859-2',
'iso8859-2': 'iso-8859-2',
'iso88592': 'iso-8859-2',
'iso_8859-2': 'iso-8859-2',
'iso_8859-2:1987': 'iso-8859-2',
'l2': 'iso-8859-2',
'latin2': 'iso-8859-2',
'csisolatin3': 'iso-8859-3',
'iso-ir-109': 'iso-8859-3',
'iso8859-3': 'iso-8859-3',
'iso88593': 'iso-8859-3',
'iso_8859-3': 'iso-8859-3',
'iso_8859-3:1988': 'iso-8859-3',
'l3': 'iso-8859-3',
'latin3': 'iso-8859-3',
'csisolatin4': 'iso-8859-4',
'iso-ir-110': 'iso-8859-4',
'iso8859-4': 'iso-8859-4',
'iso88594': 'iso-8859-4',
'iso_8859-4': 'iso-8859-4',
'iso_8859-4:1988': 'iso-8859-4',
'l4': 'iso-8859-4',
'latin4': 'iso-8859-4',
'csisolatincyrillic': 'iso-8859-5',
'cyrillic': 'iso-8859-5',
'iso-ir-144': 'iso-8859-5',
'iso8859-5': 'iso-8859-5',
'iso88595': 'iso-8859-5',
'iso_8859-5': 'iso-8859-5',
'iso_8859-5:1988': 'iso-8859-5',
'arabic': 'iso-8859-6',
'asmo-708': 'iso-8859-6',
'csiso88596e': 'iso-8859-6',
'csiso88596i': 'iso-8859-6',
'csisolatinarabic': 'iso-8859-6',
'ecma-114': 'iso-8859-6',
'iso-8859-6-e': 'iso-8859-6',
'iso-8859-6-i': 'iso-8859-6',
'iso-ir-127': 'iso-8859-6',
'iso8859-6': 'iso-8859-6',
'iso88596': 'iso-8859-6',
'iso_8859-6': 'iso-8859-6',
'iso_8859-6:1987': 'iso-8859-6',
'csisolatingreek': 'iso-8859-7',
'ecma-118': 'iso-8859-7',
'elot_928': 'iso-8859-7',
'greek': 'iso-8859-7',
'greek8': 'iso-8859-7',
'iso-ir-126': 'iso-8859-7',
'iso8859-7': 'iso-8859-7',
'iso88597': 'iso-8859-7',
'iso_8859-7': 'iso-8859-7',
'iso_8859-7:1987': 'iso-8859-7',
'sun_eu_greek': 'iso-8859-7',
'csiso88598e': 'iso-8859-8',
'csisolatinhebrew': 'iso-8859-8',
'hebrew': 'iso-8859-8',
'iso-8859-8-e': 'iso-8859-8',
'iso-ir-138': 'iso-8859-8',
'iso8859-8': 'iso-8859-8',
'iso88598': 'iso-8859-8',
'iso_8859-8': 'iso-8859-8',
'iso_8859-8:1988': 'iso-8859-8',
'visual': 'iso-8859-8',
# 'csiso88598i': 'iso-8859-8-i', # LookupError: unknown encoding: iso-8859-8-i
# 'iso-8859-8-i': 'iso-8859-8-i',
# 'logical': 'iso-8859-8-i',
'csisolatin6': 'iso-8859-10',
'iso-ir-157': 'iso-8859-10',
'iso8859-10': 'iso-8859-10',
'iso885910': 'iso-8859-10',
'l6': 'iso-8859-10',
'latin6': 'iso-8859-10',
'dos-874': 'iso-8859-11',
'iso8859-11': 'iso-8859-11',
'iso885911': 'iso-8859-11',
'tis-620': 'iso-8859-11',
'windows-874': 'iso-8859-11',
'iso8859-13': 'iso-8859-13',
'iso885913': 'iso-8859-13',
'iso8859-14': 'iso-8859-14',
'iso885914': 'iso-8859-14',
'csisolatin9': 'iso-8859-15',
'iso8859-15': 'iso-8859-15',
'iso885915': 'iso-8859-15',
'iso_8859-15': 'iso-8859-15',
'l9': 'iso-8859-15',
'cskoi8r': 'koi8-r',
'koi': 'koi8-r',
'koi8': 'koi8-r',
'koi8_r': 'koi8-r',
'koi8-u': 'koi8-u',
'csmacintosh': 'macintosh',
'mac': 'macintosh',
'x-mac-roman': 'macintosh',
'cp1250': 'windows-1250',
'x-cp1250': 'windows-1250',
'cp1251': 'windows-1251',
'x-cp1251': 'windows-1251',
'ansi_x3.4-1968': 'windows-1252',
'ascii': 'windows-1252',
'cp1252': 'windows-1252',
'cp819': 'windows-1252',
'csisolatin1': 'windows-1252',
'ibm819': 'windows-1252',
'iso-8859-1': 'windows-1252',
'iso-ir-100': 'windows-1252',
'iso8859-1': 'windows-1252',
'iso88591': 'windows-1252',
'iso_8859-1': 'windows-1252',
'iso_8859-1:1987': 'windows-1252',
'l1': 'windows-1252',
'latin1': 'windows-1252',
'us-ascii': 'windows-1252',
'x-cp1252': 'windows-1252',
'cp1253': 'windows-1253',
'x-cp1253': 'windows-1253',
'cp1254': 'windows-1254',
'csisolatin5': 'windows-1254',
'iso-8859-9': 'windows-1254',
'iso-ir-148': 'windows-1254',
'iso8859-9': 'windows-1254',
'iso88599': 'windows-1254',
'iso_8859-9': 'windows-1254',
'iso_8859-9:1989': 'windows-1254',
'l5': 'windows-1254',
'latin5': 'windows-1254',
'x-cp1254': 'windows-1254',
'cp1255': 'windows-1255',
'x-cp1255': 'windows-1255',
'cp1256': 'windows-1256',
'x-cp1256': 'windows-1256',
'cp1257': 'windows-1257',
'x-cp1257': 'windows-1257',
'cp1258': 'windows-1258',
'x-cp1258': 'windows-1258',
'x-mac-cyrillic': 'mac-cyrillic',
'x-mac-ukrainian': 'mac-cyrillic',
'chinese': 'gbk',
'csgb2312': 'gbk',
'csiso58gb231280': 'gbk',
'gb2312': 'gbk',
'gb_2312': 'gbk',
'gb_2312-80': 'gbk',
'iso-ir-58': 'gbk',
'x-gbk': 'gbk',
# 'gb18030': 'gb18030',
# 'hz-gb-2312': 'hz-gb-2312',
# 'big5': 'big5',
'big5-hkscs': 'big5',
'cn-big5': 'big5',
'csbig5': 'big5',
'x-x-big5': 'big5',
'cseucpkdfmtjapanese': 'euc-jp',
'x-euc-jp': 'euc-jp',
'csiso2022jp': 'iso-2022-jp',
'csshiftjis': 'shift_jis',
'ms_kanji': 'shift_jis',
'shift-jis': 'shift_jis',
'sjis': 'shift_jis',
'windows-31j': 'shift_jis',
'x-sjis': 'shift_jis',
'cseuckr': 'euc-kr',
'csksc56011987': 'euc-kr',
'iso-ir-149': 'euc-kr',
'korean': 'euc-kr',
'ks_c_5601-1987': 'euc-kr',
'ks_c_5601-1989': 'euc-kr',
'ksc5601': 'euc-kr',
'ksc_5601': 'euc-kr',
'windows-949': 'euc-kr',
'csiso2022kr': 'iso-2022-kr',
}
# based on: /usr/lib/python3.10/html/__init__.py
invalid_charrefs = {
0x00: ' ', # REPLACEMENT CHARACTER
0x80: '\u20ac', # EURO SIGN
0x81: '', # <control>
0x82: '\u201a', # SINGLE LOW-9 QUOTATION MARK
0x83: '\u0192', # LATIN SMALL LETTER F WITH HOOK
0x84: '\u201e', # DOUBLE LOW-9 QUOTATION MARK
0x85: '\u2026', # HORIZONTAL ELLIPSIS
0x86: '\u2020', # DAGGER
0x87: '\u2021', # DOUBLE DAGGER
0x88: '\u02c6', # MODIFIER LETTER CIRCUMFLEX ACCENT
0x89: '\u2030', # PER MILLE SIGN
0x8a: '\u0160', # LATIN CAPITAL LETTER S WITH CARON
0x8b: '\u2039', # SINGLE LEFT-POINTING ANGLE QUOTATION MARK
0x8c: '\u0152', # LATIN CAPITAL LIGATURE OE
0x8d: '\u0164', # CP1250-bol :)
0x8e: '\u017d', # LATIN CAPITAL LETTER Z WITH CARON
0x8f: '\u0179', # CP1250-bol :)
0x90: '', # <control>
0x91: '\u2018', # LEFT SINGLE QUOTATION MARK
0x92: '\u2019', # RIGHT SINGLE QUOTATION MARK
0x93: '\u201c', # LEFT DOUBLE QUOTATION MARK
0x94: '\u201d', # RIGHT DOUBLE QUOTATION MARK
0x95: '\u2022', # BULLET
0x96: '\u2013', # EN DASH
0x97: '\u2014', # EM DASH
0x98: '\u02dc', # SMALL TILDE
0x99: '\u2122', # TRADE MARK SIGN
0x9a: '\u0161', # LATIN SMALL LETTER S WITH CARON
0x9b: '\u203a', # SINGLE RIGHT-POINTING ANGLE QUOTATION MARK
0x9c: '\u0153', # LATIN SMALL LIGATURE OE
0x9d: '\u0165', # CP1250-bol :)
0x9e: '\u017e', # LATIN SMALL LETTER Z WITH CARON
0x9f: '\u0178', # LATIN CAPITAL LETTER Y WITH DIAERESIS
0xA0: ' ', #   Unicode Character 'NO-BREAK SPACE' (U+00A0)
0xAD: '', # ­ SOFT HYPHEN https://stackoverflow.com/questions/34835786/what-is-shy-and-how-do-i-get-rid-of-it
# csak ezek ternek el a magyar abc-ben a latin1 es latin2 kozott, inkabb a latin2-eset hasznaljuk ezekbol:
0xD5: '\u0150', # O~ => O"
0xDB: '\u0170', # U^ => U"
0xF5: '\u0151', # o~ => o"
0xFB: '\u0171', # u^ => u"
}
def mixed_decoder(unicode_error):
position = unicode_error.start
# new_char = unicode_error.object[position:position+1]
# new_char = new_char.decode("iso8859-1","ignore")
new_char = unicode_error.object[position] # csak 1 byte kell!
new_char = invalid_charrefs.get(new_char, chr(new_char)) # 80..9F kozott mindenfele specko irasjelek vannak, afolott meg az unicode ugyanaz mint a latin1
# print(new_char)
# print(type(new_char))
# print(len(new_char))
return new_char, position + 1
codecs.register_error("mixed", mixed_decoder)
# <meta content="text/html; charset=utf-8" http-equiv="Content-Type"/>
# <meta content="utf-8" name="charset"/>
# <meta charset="utf-8"/>
def parse_htmlhead(data,charset=None):
for ret in data.split(b'<'):
tag=ret.split(b'>')[0].lower()
if tag.startswith(b'meta'):
p=tag.find(b'charset=')
if p>=0:
# print(tag)
charset=""
for c in tag[p+8:]:
if c<=32: continue # whitespace
if c==34 or c==39: # idezojelek
if charset: break
continue
if not c in b'_-0123456789abcdefghijklmnopqrstuvwxyz': break
charset+=chr(c)
# print('CHARSET='+charset)
if charset: break
return charset
# a tag-bol kiparsoljuk a tag nevet, es hogy milyen: -1=endtag 0=selfclosing 1=nyito
def tag_type(tag):
if tag[:1]==b'!': return 0,'!' # special
if tag[:1]==b'?': return 0,'?' # special
name=''
closing=False
for c in tag:
if c==47: # /
if name: break # <br/>
closing=True # a tag neve elott van a /
continue
if c<=32: # whitespace
if not name: continue # a tag neve elotti whitespace
break # done
if c<97 or c>122: break # fixme: szamokat is le kene kezelni!
name+=chr(c)
# print(name)
if name in ['br','area','base','meta','col','embed','hr','img','input','link','param','source','track','wbr']: return 0,name # self-closing tags
if closing: return -1,name
if tag[-1:]==b'/': return 0,name
return 1,name
def html2text(data,debug=False):
warning=''
indent=0
p=data.find(b'<')
if p<0: # not html!?
return (data,[data]) if debug else data
text=[data[:p]] if p>0 else [] # initial text before 1st tag
tlen=0 #len(data[:p].strip())
if debug:
html=[] if data[p:p+9]==b'<!DOCTYPE' else [b'<!DOCTYPE HTML>\n']
html+=[data[:p]]
while p<len(data): #for ret in data.split(b'<'):
# FIND end of tag!
q=p+1
if data[p:p+4]==b'<!--': # comment "tag" - ennek csak --> lehet a vege, addig ignoralni kell mindent!
q=data.find(b'-->',p)
# warning+="COMMENT block found: %d-%d\n"%(p,q)
if q<0:
q=p+1 # broken...
warning+="WARN! missing comment end-tag at %d-\n"%(p)
ijel=None
eqsn=False
while q<len(data):
c=data[q]
q+=1
if ijel: # quoted string-en belul vagyunk?
# if c==62 or c==60: warning+="WARN! %c inside %c at %d\n"%(c,ijel,q) # < vagy > idezojelek kozott, de ez amugy okes
if c==ijel: ijel=None # idezet vege
continue
if eqsn: # = jel utan vagyunk?
if c==34 or c==39: ijel=c # idezojelek = utan oke
if c>32: eqsn=False # nem whitespace (9,10,13,32)
else:
if c==34 or c==39: # idezojelek = jel nelkul:
if data[p+1]!=33: warning+="WARN! %c without = at %d\n"%(c,q) # <! utan oke (a doctype-ban pl. lehet), egyebkent warning
if c==61: eqsn=True # =
if c==62: break # >
#
tag=data[p+1:q-1].lower() # tag without < >
tt,ttag=tag_type(tag) # tag type,name
in_block= tt>0 and ttag in ['style','script','title','svg','annotation'] # TODO FIXME: svg kell ide?
# print("TAG:",p,q,tt,ttag,tag) # debug
if debug:
if tt<0: indent-=1
html+=[b'%5d|'%(p)+b' '*max(0,min(64,indent)) + data[p:q].replace(b'\n',b' ')]
if tt>0: indent+=1
# FIND next tag:
p=data.find(b'<',q)
while True:
# print(p,in_block,data[p:p+10])
if p<0 or p+2>=len(data):
p=len(data) # EOF
break
if in_block: # mas parser altal kezelt (js, css, svg stb) blokk veget keressuk, ebben csak a cdata-val kell foglalkozni az endtag-en kivul:
endtag=bytes('</'+ttag,'ascii') # ez igy nem szep, es elvileg lefuthat foloslegesen tobbszor is, de gyakorlatilag ez nem jellemzo
if data[p:p+len(endtag)].lower()==endtag: # </ttag>
# warning+="%s block found: %d-%d\n"%(ttag,q,p)
break
if data[p:p+9]==b'<![CDATA[': # https://stackoverflow.com/questions/2784183/what-does-cdata-in-xml-mean
pp=data.find(b']]>',p)
warning+="CDATA block found in %s: %d-%d\n"%(ttag,p,pp)
if pp>0: p=pp #+3 nem szabad a kovetkezo < jelre mutatnia a p-nek, mert a loop vegen van egy find p+1 es akkor pont atugorja!!!
else: warning+="WARN! missing CDATA end-tag at %d- (in %s)\n"%(p,ttag)
#else: warning+="WARN! skip <%c at %d in %s\n"%(c,p,ttag) # igazabol itt lehet barmi, megengedett...
else:
c=data[p+1]
if c==47 or c==33 or 97<=c<=122 or 65<=c<=90 or c==63: break # </ or <! or <tag [a-z,A-Z] or <?xml
warning+="WARN! skip <%c at %d\n"%(c,p) # hibas tag formatum!
p=data.find(b'<',p+1) # skip this < and find next one
if debug:
html+=[data[q:p].rstrip()+b'\n']
if warning: html+=[b' <!> |' + warning.encode("utf-8",errors="ignore")] # beirjuk a sorok koze inkabb!
warning=""
if in_block:
# print("Skipping %s block at %d-%d, size=%d"%(ttag,q,p,p-q)) # debug
if p>=len(data): warning+="WARN! non-closed tag %s at %d-\n"%(ttag,q) # EOF, tehat nincs meg az endtag!
continue
txt=data[q:p]
# print(q,p,tt,ttag,txt) # debug
if b'style' in tag: # detect hidden text!
tag=tag.replace(b': ',b':')
if b'display:none' in tag or b'font-size:0p' in tag or b'font-size:1p' in tag or b'max-height:0p' in tag or b'mso-hide:all' in tag or b'opacity:0' in tag:
if b'signedadaptivecard' in tag: continue # ms teams hidden base64 data!!!
# if b'display:none' in tag and len(text.strip())==0:
if b'display:none' in tag and tlen==0:
if len(txt.strip())>=3: text+=[b'['+txt+b'] '] # preview header https://responsivehtmlemail.com/html-email-preheader-text/
# else:
# if len(txt.strip())>=3: text+=[b'{{'+txt+b'}}'] # hidden text
continue
if tag==b'div' or (tt>=0 and ttag in ['p','br','tr']):
text+=[b'<BR>'] # https://www.w3schools.com/html/html_blocks.asp
else:
if not ttag in ['span','a','b','i','u','em','strong','abbr','font']: text+=[b' '] # not inline elements
text+=[txt]
tlen+=len(txt.strip())
if debug and warning: html+=[b' <!> |' + warning.encode("utf-8",errors="ignore")] # beirjuk a sorok koze inkabb!
text=b''.join(text)
text=b' '.join(text.split()) # remove redundant spaces
text=b'\n'.join([ t.strip() for t in text.split(b'<BR>') ])
if debug: return text, html
return text
def parse_ics(data):
ics=[]
hdr=b''
for line in data.split(b'\n'):
if line[:1]==b' ' or line[:1]==b'\t':
hdr+=line[1:].rstrip()
continue
if hdr: ics.append(hdr.split(b':',1))
hdr=line.rstrip()
if hdr: ics.append(hdr.split(b':',1))
def unescape(text):
return text.replace(b'\\N', b'\\n')\
.replace(b'\r\n', b'\n')\
.replace(b'\\n', b'\n')\
.replace(b'\\,', b',')\
.replace(b'\\;', b';')\
.replace(b'\\\\', b'\\')
for x in ics:
# print(x)
if x[0][:11]==b'DESCRIPTION': return unescape(x[1]) # DESCRIPTION;LANGUAGE=hu-HU:Kedves Endre\,\n\n\nSzeretettel
if x[0]==b'X-ALT-DESC;FMTTYPE=text/html': return html2text(unescape(x[1]))
return b'' # FIXME
def parse_docx(data): # if ctyp=="application/vnd.openxmlformats-officedocument.wordprocessingml.document" or fnev.endswith(".docx"):
# try:
zipf=zipfile.ZipFile(io.BytesIO(data))
xml=zipf.read('word/document.xml') #.decode("utf-8")
s=b''
for ret in xml.split(b'<'):
try:
tag,txt=ret.split(b'>',1)
tag1=tag.split()[0]
except:
continue
if tag1==b'w:t':
s+=txt
elif tag1 in [b'w:tab',b'w:br',b'w:cr',b'w:p']:
s+=b'\n'
return s
def is_utf8(s):
# s=[c for c in s if c>=128] # only non-ascii bytes
# if len(s)<2: return False
lengths=[ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 3, 3, 4, 0 ]
ok=0
bad=0
e=0
for a in s:
l=lengths[a>>3]
# print(a,l,e)
if l==0: # non-first utf8 byte!
if e>0: # we need 'e' extra bytes, it's ok then
e-=1
ok+=1
else:
bad+=1
else:
bad+=e # ha e>0, akkor hianyzik 'e' darab extra byte meg, es ujra start-byte (vagy ascii) jott!!
e=l-1
if e>0: bad+=e # hianyzik par byte...
# print(ok,bad)
return ok>4*bad # ha bad==0 akkor ok==1 is eleg!
def decode_payload(data,ctyp="text/html",charset=None):
ldata=data.lower()
if ctyp=="text/calendar" or ctyp=="application/ics":
data=parse_ics(data)
elif ctyp=="application/vnd.openxmlformats-officedocument.wordprocessingml.document":
data=parse_docx(data)
charset="utf-8"
elif ctyp=="application/ms-tnef":
# print("###### Parse TNEF ######")
tnefobj = TNEF(data)
if tnefobj.htmlbody:
# charset=tnefobj.codepage or "utf-8"
charset="utf-8"
data=html2text(tnefobj.htmlbody.encode(charset))
else:
data=b''
# elif tnef_support>1 and tnefobj.rtfbody:
# data=rtf_to_text(tnefobj.rtfbody.decode(tnefcp,"ignore"))
elif ctyp=="text/html" or ctyp=="text/xml" or ((ctyp!="text/plain" or b'</head>' in ldata or b'</br>' in ldata) and b'<' in ldata and (ldata.find(b'<body')>=0 or ldata.find(b'<img ')>=0 or ldata.find(b'<style')>=0 or ldata.find(b'<br>')>=0 or ldata.find(b'<center>')>=0 or ldata.find(b'<a href')>=0)):
p=ldata.find(b'<body')
if p>0: charset=parse_htmlhead(data[:p],charset) # parse charset override from <head>
if charset and (charset.startswith("iso-2022") or charset.startswith("csiso2022")): # https://en.wikipedia.org/wiki/ISO/IEC_2022
data=data.decode(charset,errors="ignore").encode("utf-8") # japan/koreai, 7 bitbe kodolt tobb byteos karakterkodok, ESC-el stb, a html parser nem birja :)
charset="utf-8"
data=html2text(data) # binary version!
if not charset:
charset="iso8859-1"
elif charset in charset_mapping:
charset=charset_mapping[charset]
if charset=="utf-8" or is_utf8(data):
# Try UTF-8:
try:
data=data.decode("utf-8", 'strict')
except UnicodeDecodeError as e:
# print('BAD_UTF8, CHARSET='+charset) #, repr(e))
data=data.decode(charset, 'mixed') # exceptiont dob ha nincs ilyen charset!
else:
try:
data=data.decode(charset, 'mixed')
except LookupError: # nincs 'charset' nevu kodlap:
# print('BAD_CHARSET='+charset)
data=data.decode("utf-8", 'mixed') # lehet inkabb latin2 kene eleve?
# ezt mar a dekodolas utan kell :(
if ctyp=="application/rtf":
data=rtf_to_text(data) # remove RTF markup
else:
data=unescape(data) # fix > etc
return ''.join([invalid_charrefs.get(ord(c),c) for c in data])
def eml2str(msg,ds2=False):
msg=parse_eml(msg,decode=True)
subject=None
if ds2: # extract subject
for h in msg["headers"]:
try:
hh=h.split(b':',1)
if hh[0].lower()==b'subject': subject=remove_spamtag(hdrdecode4(hh[1]))
except: pass
def walk(eml):
if eml["parts"]:
for p in eml["parts"]: yield from walk(p)
else: yield eml
text=""
for p in walk(msg):
ctyp=p["ctyp"]
disp=p["disp"]
charset=p["charset"]
fnev=p["name"]
# print((ctyp,charset,disp,fnev))
if (ctyp.split('/')[0]=="text" and disp!="attachment") or ctyp=="application/ics" or (ctyp=="application/ms-tnef" and tnef_support) or (ctyp=="application/rtf" and rtf_support):
data=p["payload"]
data=decode_payload(data,ctyp,charset)
# if not text or len(data)>20: text=data # a kesobbi szoveg vszinu jobb (html>text, delivery hibak utan csatolva az eredeti level, elol a spamassassin fejlece stb)
if not text or (ctyp in ["text/html","application/ms-tnef"] and len(data)>20) or len(data)>len(text)//2 or text.startswith("Spam detection software,"): text=data
if ctyp in ["text/html","application/ms-tnef"] and len(text)>200: break
return (subject,text) if subject else text
def get_mimedata(eml):
mimeinfo=["RAW message: %d bytes"%(len(eml))]
mimedata=[eml]
msg=parse_eml(eml,decode=True)
def walker(msg,level=0):
# print(" "*(level*3), msg.is_multipart(), msg.get_content_type(), msg.get_content_charset(), msg.is_attachment(), msg.get_filename())
# s=" "*(level*3) + "Multi:"+str(msg.is_multipart())+" "+str(msg.get_content_type())
ctyp=msg["ctyp"]
cset=msg["charset"]
s=" "*(level*3) + str(ctyp) # + str(msg.is_multipart())
if cset: s+="["+str(cset)+"]"
#raw=msg.as_bytes()
raw=msg["raw"] # tupple of start-end position
raw=eml[raw[0]:raw[1]]
s+=" (%d) "%(len(raw))
pay=msg.get("payload",None)
html=None
if pay:
s+="%d"%(len(pay))
if ctyp.startswith("text/") or ctyp=="application/ics" or (ctyp=="application/ms-tnef" and tnef_support) or (ctyp=="application/rtf" and rtf_support) or ctyp=="application/vnd.openxmlformats-officedocument.wordprocessingml.document":
html=decode_payload(pay,ctyp,cset) # ez meg a prettify elott kell, mert az elbassza a whitespacet...
if ctyp=="text/html" or ctyp=="text/xml":
html="\n".join([" ".join(s.split()) for s in html.splitlines() if s]) # remove empty lines and redundant spaces
dtext,dhtml=html2text(pay,debug=True) # html prettify :)
pay=b''.join(dhtml)
mimeinfo.append(s)
# Attachment file:
if msg["name"]:
mimedata.append(raw)
s=" "*(level*3+3)
if msg["disp"]: s+=msg["disp"]+": " # "Attach: " if msg.is_attachment() else "Inline: "
s+=msg["name"]
mimeinfo.append(s)
mimedata.append(pay if pay else raw)
# HTML: add Extracted text
if html:
pay2=html.encode("utf-8",errors='xmlcharrefreplace')
if pay!=pay2:
mimedata.append(pay2)
mimeinfo.append(" "*(level*3+3)+"Extracted text: "+str(len(html))+"/"+str(len(pay2)))
# for subpart in msg.iter_parts(): # policy=email.policy.default
# walker(subpart,level+1)
if msg["parts"]: # msg.is_multipart():
for subpart in msg["parts"]: #msg.get_payload(): # az iter_parts() bugos, csak multipartra jo, message/rfc-re NEM!!!
walker(subpart,level+1)
# if msg.is_multipart():
# for subpart in msg.get_payload(): # policy=email.policy.compat32
# walker(subpart,level+1)
walker(msg)
return mimeinfo,mimedata
#TAG_RE1 = re.compile(r'<[^>]+>')
#TAG_RE2 = re.compile(r'\[[^[]+\]')
TAG_RE3 = re.compile(r'https? ?: ?//[-._a-zA-Z0-9/?&=#@]*')
TAG_RE4 = re.compile(r'[-+_$=_.A-Za-z0-9]*@[-.a-z0-9]*\.[a-z][a-z][a-z]*')
TAG_RE5 = re.compile(r'[1-9][-.,:/0-9 ]+[0-9]')
TAG_RE6 = re.compile(r'[a-zA-Z][a-zA-Z][-.0-9a-zA-Z]*\.hu')
#TAG_RE6 = re.compile(r'[-0-9a-z][-0-9a-z][-0-9a-z]*\.[-0-9a-z][-0-9a-z][-0-9a-z]*\.[-0-9a-z][-0-9a-z][-0-9a-z]?')
#TAG_email=re.compile(r'([A-Za-z0-9]+[.-_])*[A-Za-z0-9]+@[A-Za-z0-9-]+(\.[A-Z|a-z]{2,})+')
def remove_url(text):
text=TAG_RE3.sub('<URL>', text)
text=TAG_RE4.sub('<EMAIL>', text)
text=TAG_RE6.sub('<DOMAIN>', text)
# text=TAG_RE5.sub('<NUMBER>', text)
return text
# *****SPAM{15.0}*****
STAG_SA = re.compile(r'\*\*\*\*\*SPAM[{(][0-9][.0-9]*[)}]\*\*\**')
def remove_spamtag(text):
text=STAG_SA.sub("", text) # Spamassassin
text=text.replace("*****SPAM*****","").replace("[SPAM]","").replace("[Spam]","") # External
text=text.replace("[SpaM]","").replace("[E:spam]","").replace("[E:infected]","") # ESETS
text=text.replace("[K:Spam]","").replace("[K:Phishing]","").replace("[K:Virus]","").replace("[K:Mass]","") # Kaspersky
text=text.replace("[Outlook levélszemét-bejelentő]","").replace("[Outlook junk mail report]","") # Outlook
return text
def vocab_split(preview):
# preview=remove_url(preview)
tok=[]
s=""
inw=False
for c in preview:
# if not c.isalpha(): # if c in '\n\t #".,!?;:_-+/*()[]{}0123456789':
# if not c.isalnum():
if not (c.isalnum() or (s and s[-1].isnumeric() and c in ":-/." )): # handle special case of date/phone numbers...
if inw:
tok.append(s)
s=c
inw=False
continue
s+=c
continue
if inw:
s+=c
continue
tok.append(s)
s=c
inw=True
tok.append(s)
return tok
# parses "Content-*: value; option2=value2" type headers to dict
def parse_ctyp(data,hdr=b'_',ct=None):
if ct==None: ct={}
# print(hdr,data)
p=data.find(b';')
if p<0: p=len(data)
ct[hdr]=data[:p].strip().split(b' ')[0]
# parse parameters:
q=p+1
ijel=None
eqsn=False
name=[]
value=[]
while q<len(data):
c=data[q]
q+=1
if ijel: # quoted string-en belul vagyunk?
# if c==62 or c==60: warning+="WARN! %c inside %c at %d\n"%(c,ijel,q) # < vagy > idezojelek kozott, de ez amugy okes
if c==ijel: ijel=None # idezet vege
else: value.append(c) # idezojelen belul kell minden whitespace is...
elif c==59: # ;
if name: ct[bytes(name).lower()]=bytes(value).rstrip()
name=[]
value=[]
eqsn=False
elif eqsn: # after the = character -> value
if c==34 or c==39: ijel=c # idezojelek = utan oke
elif value or c>32: value.append(c) # skip initial WS
else: # before the = character -> name
if c==61: eqsn=True # =
elif name or c>32: name.append(c)
if name: ct[bytes(name).lower()]=bytes(value).rstrip()
return ct
# https://www.w3.org/Protocols/rfc1341/5_Content-Transfer-Encoding.html
def decode_body(data,encoding):
try:
if encoding=='base64': return a2b_base64(data)
# if encoding=='quoted-printable': return a2b_qp(data)
if encoding in ['quoted-printable','utf8','utf-8']: return a2b_qp(data)
except Exception as e:
print("PayloadDecodingExc:",repr(e))
# if not encoding in ['7bit','8bit','binary','utf-8']: print("UnknownEncoding:",encoding)
if encoding and not encoding in ['7bit','8bit','binary']: print("UnknownEncoding:",encoding) # The values "8bit", "7bit", and "binary" all imply that NO encoding
return data
def parse_eml(data,debug=False,decode=False,level=0,p=0,pend=-1):
if pend<0: pend=len(data)
# find header size:
hsize=data.find(b'\n\n',p,pend)+2
if hsize<2: hsize=pend
hsize2=data.find(b'\r\n\r\n',p,pend)+4
newline=b'\n'
if hsize2>=4 and hsize2<hsize: hsize,newline=hsize2,b'\r\n'
if debug: print("parse_eml:", level, p,hsize, pend, newline, data[p:p+32],data[hsize:hsize+32],data[pend-32:pend])
# if level>0 and not data.startswith(b'Content-') and b'Content-' in data: print("BadHeader:",data[:120]) # MIME-Version: es Date: is szokott lenni legelol...
# process headers
headers=[]
hdr=None
for rawline in data[p:hsize].split(b'\n'):
line=rawline.rstrip(b'\r')
if line and line[0] in [9,32]:
hdr+=b' '+line.lstrip(b'\t ')
continue
if hdr: headers.append(hdr)
hdr=line
if len(line)==0: break
# if hdr: print("HeaderParseErr:",hdr)
# parse Content-*: headers (get type/encoding/charset/filename)
ct={}
for hdr in headers:
h=hdr.split(b':',1)
# if debug: print(h)
if h[0].lower()==b'content-type': parse_ctyp(h[1],b'_ct',ct)
if h[0].lower()==b'content-disposition': parse_ctyp(h[1],b'_cd',ct)
if h[0].lower()==b'content-transfer-encoding': parse_ctyp(h[1],b'_ce',ct)
# if debug: print(level,hsize,len(data),ct)
ctyp=ct.get(b'_ct',b'').decode("us-ascii",errors="ignore").lower()
cenc=ct.get(b'_ce',b'').decode("us-ascii",errors="ignore").lower()
# disp=ct.get(b'_cd',b'').decode("us-ascii",errors="ignore").lower()
disp=ct[b'_cd'].decode("us-ascii",errors="ignore").lower() if b'_cd' in ct else None
# cset=ct.get(b'charset',b'').decode("us-ascii",errors="ignore").lower()
cset=ct[b'charset'].decode("us-ascii",errors="ignore").lower() if b'charset' in ct else None
try: name=hdrdecode4(ct[b'filename']) if b'filename' in ct else hdrdecode4(ct[b'name']) if b'name' in ct else None
except: name="EXC!" # hdrdecode4 my fail for wrong codepage
eml={"headers":headers, "raw":(p,pend), "size":pend-p, "hsize":hsize-p, "ct":ct, "ctyp":ctyp or 'text/plain', "charset":cset, "encoding":cenc, "disp":disp, "name":name, "parts":[]}
# if b'name' in ct: print("FNAME:",hdrdecode4(ct[b'name']))
# if b'filename' in ct: print("FNAME:",hdrdecode4(ct[b'filename']))
# 27140 MULTI: b'multipart/alternative'
# 1388 MULTI: b'multipart/mixed'
# 1701 MULTI: b'multipart/related'
# 23 MULTI: b'multipart/report'
# 1 MULTI: b'multipart/digest'
# 1 MULTI: b'multipart/parallel'
if b'boundary' in ct and ctyp.startswith('multipart/'):
# split data by boundary to parts
bo=b'--'+ct[b'boundary']
q=p=hsize # data=data[hsize:]
first=True
last=False
while p<pend:
p=data.find(bo,p,pend)
_p=p
if p<0: # process data after the last boundary: (the end-boundary tag is missing too often...)
# if first: print("BoundaryNotFound:",q,pend,bo) #, data[:100])
if not last: print("BoundaryNotFound:",q,pend,bo) #, data[:100])
pp=p=pend
if data[q:q+8]!=b'Content-' and data[q:pend].strip(): print("PostBoundaryText:",q,p,len(data), data[q:pend])
# print(_p,p,pp)
else:
pp=p # pp->start of next boundary
p+=len(bo)
if pp>0 and data[pp-1]==10: # backward skip pre-boundary newline... for compatibility with email lib :(
pp-=1
if pp>0 and data[pp-1]==13: pp-=1
else: print("BoundaryNoNewline:",q,pp,pend,bo)
#if debug:
if data[p:p+2]==b'--':
p+=2 # end boundary
last=True
if debug: print(level,"Boundary:",_p,first,last,q,pp,p,pend,data[pp:p],data[p:min(p+10,pend)])
# (p->end of next boundary)
if p>=pend or data[p]<=32 or data[p:p+8]==b'Content-': # boundary string at EOF or followed by newline/whitespace or Content-*
# found!
part=data[q:pp]
if part and len(part.strip())>2: # not empty block
if first and b'Content-Type:' in part: # headers before first boundary!
q+=part.find(b'Content-') # workaround buggy emails
print("BoundaryFixCont:",q,data[q:q+20],part[:50])
first=False
if not first or len(part)>=300 or not (b'MIME' in part or b'multipart message' in part.lower() or b' mime format' in part.lower()): # skip empty/useless compatibility text!
if first: print("PreBoundaryText:",len(part),part)
pe=parse_eml(data,debug,decode,level+1,p=q,pend=pp)
eml["parts"].append(pe)
# else: print("SkipUseless:",len(part),part)
while p<pend and data[p]<=32 and data[p]!=10: p+=1 # skip whitespace
if p<pend and data[p]==10: p+=1 # skip newline
q=p
first=False
elif data[p:p+4]!=b'_alt': print("BoundarySkip:",q,pp,p,data[pp:p],data[p:p+10])
elif ctyp.startswith('message/'):
# message/disposition-notification
# message/rfc822
pe=parse_eml(data,debug,decode,level+1,p=hsize,pend=pend)
eml["parts"].append(pe)
elif decode:
# data, decode?
eml["payload"]=decode_body(data[hsize:pend], cenc)
# if not ctyp and len(eml["payload"].strip())<3: eml["payload"]=data[p:pend] # no headers, no body...
return eml
def readfolder(f,do_eml,keephdrs=['from','subject','x-deepspam','x-grey-ng']):
eml=None
in_hdr=0
fpos=f.tell()
for rawline in f:
if in_hdr:
fpos+=len(rawline)
line=rawline.rstrip(b'\r\n') # The chars argument is a string specifying the set of characters to be removed.
if len(line)==0: # empty line -> end of the header
in_hdr=0
eml["_hsize"]=fpos-eml["_fpos"]
elif line[0] in [9,32]: # starts with tab/space -> header continuation
hdr+=line # keep whitespace?
continue
if hdr:
try:
hdrname,hdrbody = hdr.split(b':',1)
hdrname=hdrname.decode("us-ascii").lower()
if hdrname in keephdrs: # csak ezek kellenek
eml[hdrname]=hdrbody.lstrip().decode("utf-8", 'mixed')
except Exception as e:
print("INVALID:",hdr,"\n EXC:", repr(e))
hdr=line
continue
# in body:
if rawline[0:5]==b'From ':
if eml: do_eml(eml,fpos)
in_hdr=1
hdr=b''
eml={"_fpos":fpos,"_from":rawline.rstrip(b'\r\n').decode("us-ascii", errors="ignore")}
elif not eml: # and (rawline[:10]==b'X-Grey-ng:' or rawline[:9]==b'Received:'):
in_hdr=1
hdr=rawline.rstrip(b'\r\n')
eml={"_fpos":fpos}
elif rawline.startswith(b'Content-Disposition: attachment'):
eml['_attach']=True
fpos+=len(rawline)
if eml: do_eml(eml,fpos)
return fpos # folder file size
hdr_re=re.compile(r'=\?([^?]*?)\?([qQbB])\?(.*?)\?=') # non-greedy matching =? ... ? [bBqQ] ? ... ?=
def hdrdecode4(h):
if type(h)!=str: h=h.decode("utf-8","mixed") # handle bytes input
parts = hdr_re.split(h)
# print(type(parts),parts)
strips=[]
while parts:
textpart=parts.pop(0)
if textpart and not textpart.isspace(): strips.append([textpart,None]) # ignore spaces between encoded parts!
if parts:
cset=parts.pop(0).lower()
cfmt=parts.pop(0).lower() # csak q es b lehet!
cenc=parts.pop(0)
# print((cset,cfmt,cenc))
try:
if cfmt=='q': cdec=a2b_qp(cenc.replace("==","="), header=True) # lehets=C3==A9ges
else: cdec=a2b_base64(cenc+"===")
# EVIL workaround: some utf8 strings are splitted in the middle of an utf8 character...
if strips and strips[-1][1]==cset: # try to concatenate these parts before decoding!
strips[-1][0]+=cdec
else:
strips.append([cdec,cset])
except Exception as e:
print(repr(e),cfmt,repr(cenc))
return "".join(x[0] if x[1]==None else x[0].decode(charset_mapping.get(x[1],x[1]) or "utf-8","mixed") for x in strips)
from_re1=re.compile(r'^(?:(\"((?:\\.|[^\"])*?)\"\s*)|(.*?))\s*<([^>]*?)>$') # ("val\" ami"|vala mi) <emailcim> -> \2|\3 <\4>
from_re2=re.compile(r'^(.*?)([^<>\")\s]*@[-.a-zA-Z0-9]*)\s*(\(.*\))?') # \1 emailcim (\3) -> \3|\1 <\2>
# split From: header to Address and Name part (does not decode)
def parse_from(h):
m=from_re1.match(h)
if m: # match! new style: name <address>
return m.group(4),(m.group(2) or m.group(3) or "")
m=from_re2.match(h)
if m: # match! old style: address (name)
return m.group(2),(m.group(3) or m.group(1) or "")
# print("BADdress:",h)
return "",h # no address found...
# split From: header to Address and Name part (and decode it)
def decode_from(h):
a,n=parse_from(h.strip())
n=hdrdecode4(n)
if not a and '@' in n: a,n=parse_from(n.strip()) # workaround(=ugly hack) for base64-encoded email addresses...
# print("%50s | %s"%(a,n))
return a,n