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py8583.py
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py8583.py
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import binascii
import struct
from enum import Enum
verbose = False
# Data Type enumeration
class DT(Enum):
BCD = 1
ASCII = 2
BIN = 3
# Length Type enumeration
class LT(Enum):
FIXED = 0
LVAR = 1
LLVAR = 2
LLLVAR = 3
def MemDump(Title, data):
i = 1
if( isinstance(data, bytes) == False ):
raise TypeError("Expected bytes for data")
print(Title)
TheDump = ""
for c in data:
try: # python 3
TheDump += "{:02x} ".format(c)
except: # python 2.x
TheDump += "{:02x} ".format(ord(c))
if(i % 16 == 0):
TheDump += "\n"
i+=1
print(TheDump)
def Bcd2Str(bcd):
return binascii.hexlify(bcd).decode('latin')
def Str2Bcd(string):
if(len(string) % 2 == 1):
string = string.zfill(len(string) + 1)
return binascii.unhexlify(string)
def Bcd2Int(bcd):
return int(Bcd2Str(bcd))
def Int2Bcd(integer):
string = str(integer)
if(len(string) % 2 == 1):
string = string.zfill(len(string) + 1)
return binascii.unhexlify(string)
class ParseError(Exception):
def __init__(self, value):
self.str = value
def __str__(self):
return repr(self.str)
class SpecError(Exception):
def __init__(self, value):
self.str = value
def __str__(self):
return repr(self.str)
class BuildError(Exception):
def __init__(self, value):
self.str = value
def __str__(self):
return repr(self.str)
class Iso8583:
ValidContentTypes = ('a', 'n', 's', 'an', 'as', 'ns', 'ans', 'b', 'z')
def __init__(self,IsoMsg = None, IsoSpec = None):
self.Strict = False
self.__Bitmap = {}
self.__FieldData = {}
self.__FieldLen = {}
self.__iso = b''
if(IsoSpec != None):
self.__IsoSpec = IsoSpec
else:
self.__IsoSpec = py8583spec.IsoSpec1987ASCII()
if(IsoMsg != None):
if( isinstance(IsoMsg, bytes) == False ):
raise TypeError("Expected bytes for iso message")
self.__iso = IsoMsg
self.ParseIso()
def Strict(self, Value):
if(Value != True and Value != False):
raise ValueError
self.Strict = Value
def SetIsoContent(self, IsoMsg):
if( isinstance(IsoMsg, bytes) == False ):
raise TypeError("Expected bytes for iso message")
self.__iso = IsoMsg
self.ParseIso()
def ParseMTI(self, p):
DataType = self.__IsoSpec.DataType('MTI')
if(DataType == DT.BCD):
self.__MTI = Bcd2Str(self.__iso[p:p+2])
p+=2
elif(DataType == DT.ASCII):
self.__MTI = self.__iso[p:p+4].decode('latin')
p+=4
try: # MTI should only contain numbers
int(self.__MTI)
except:
raise ParseError("Invalid MTI: [{0}]".format(self.__MTI))
if(self.Strict == True):
if(self.__MTI[1] == '0'):
raise ParseError("Invalid MTI: Invalid Message type [{0}]".format(self.__MTI))
if(int(self.__MTI[3]) > 5):
raise ParseError("Invalid MTI: Invalid Message origin [{0}]".format(self.__MTI))
return p
def ParseBitmap(self, p):
DataType = self.__IsoSpec.DataType(1)
if(DataType == DT.BIN):
Primary = self.__iso[p:p+8]
p += 8
elif(DataType == DT.ASCII):
Primary = binascii.unhexlify(self.__iso[p:p+16])
p += 16
IntPrimary = struct.unpack_from("!Q", Primary)[0]
for i in range(1, 65):
self.__Bitmap[i] = (IntPrimary >> (64 - i)) & 0x1
if(self.__Bitmap[1] == 1):
if(DataType == DT.BIN):
Secondary = self.__iso[p:p+8]
p += 8
elif(DataType == DT.ASCII):
Secondary = binascii.unhexlify(self.__iso[p:p+16])
p += 16
IntSecondary = struct.unpack_from("!Q", Secondary)[0]
for i in range(1, 65):
self.__Bitmap[i+64] = (IntSecondary >> (64 - i)) & 0x1
return p
def ParseField(self, field, p):
try:
DataType = self.__IsoSpec.DataType(field)
LenType = self.__IsoSpec.LengthType(field)
ContentType = self.__IsoSpec.ContentType(field)
MaxLength = self.__IsoSpec.MaxLength(field)
except:
raise SpecError("Cannot parse F{0}: Incomplete field specification".format(field))
try:
if(DataType == DT.ASCII and ContentType == 'b'):
MaxLength *= 2
if(LenType == LT.FIXED):
Len = MaxLength
elif(LenType == LT.LVAR):
pass
elif(LenType == LT.LLVAR):
LenDataType = self.__IsoSpec.LengthDataType(field)
if(LenDataType == DT.ASCII):
Len = int(self.__iso[p:p+2])
p+=2
elif(LenDataType == DT.BCD):
Len = Bcd2Int(self.__iso[p:p+1])
p+=1
elif(LenDataType == DT.BIN):
Len = struct.unpack('!B', self.__iso[p:p+1])[0]
p+=1
elif(LenType == LT.LLLVAR):
LenDataType = self.__IsoSpec.LengthDataType(field)
if(LenDataType == DT.ASCII):
Len = int(self.__iso[p:p+3])
p+=3
elif(LenDataType == DT.BCD):
Len = Bcd2Int(self.__iso[p:p+2])
p+=2
elif(LenDataType == DT.BIN):
Len = struct.unpack('!H', self.__iso[p:p+2])[0]
p+=2
except ValueError:
raise ParseError("Cannot parse F{0}: Invalid length".format(field))
if(Len > MaxLength):
raise ParseError("F{0} is larger than maximum length ({1}>{2})".format(field, Len, MaxLength))
self.__FieldLen[field] = Len
# In case of zero length, don't try to parse the field itself, just continue
if(Len == 0):
return p
try:
if(DataType == DT.ASCII):
if(ContentType == 'n'):
self.__FieldData[field] = int(self.__iso[p:p+(Len)])
else:
self.__FieldData[field] = self.__iso[p:p+(Len)].decode('latin')
p += Len
elif(DataType == DT.BCD):
if(Len % 2 == 1):
Len += 1
if(ContentType == 'n'):
self.__FieldData[field] = Bcd2Int(self.__iso[p:p+(Len//2)])
elif(ContentType == 'z'):
self.__FieldData[field] = binascii.hexlify(self.__iso[p:p+(Len//2)]).decode('latin').upper()
p += Len//2
elif(DataType == DT.BIN):
self.__FieldData[field] = binascii.hexlify(self.__iso[p:p+(Len)]).decode('latin').upper()
p += Len
except:
raise ParseError("Cannot parse F{0}".format(field))
if(ContentType == 'z'):
self.__FieldData[field] = self.__FieldData[field].replace("D", "=") # in track2, replace d with =
self.__FieldData[field] = self.__FieldData[field].replace("F", "") # in track2, remove trailing f
if (verbose):
print ("Self={}, Field={}, p={}, data={}").format(self, field, p, self.__FieldData[field])
return p
def ParseIso(self):
p = 0
p = self.ParseMTI(p)
p = self.ParseBitmap(p)
for field in sorted(self.__Bitmap):
# field 1 is parsed by the bitmap function
if(field != 1 and self.Field(field) == 1):
if( field not in self.__IsoSpec.IgnoreFields):
p = self.ParseField(field, p)
def BuildMTI(self):
if(self.__IsoSpec.DataType('MTI') == DT.BCD):
self.__iso += Str2Bcd(self.__MTI)
elif(self.__IsoSpec.DataType('MTI') == DT.ASCII):
self.__iso += self.__MTI.encode('latin')
def BuildBitmap(self):
DataType = self.__IsoSpec.DataType(1)
# check if we need a secondary bitmap
for i in self.__Bitmap.keys():
if(i > 64):
self.__Bitmap[1] = 1
break
IntPrimary = 0
for i in range(1, 65):
if i in self.__Bitmap.keys():
IntPrimary |= (self.__Bitmap[i] & 0x1) << (64 - i)
Primary = struct.pack("!Q", IntPrimary)
if(DataType == DT.BIN):
self.__iso += Primary
elif(DataType == DT.ASCII):
self.__iso += binascii.hexlify(Primary)
# Add secondary bitmap if applicable
if 1 in self.__Bitmap.keys() and self.__Bitmap[1] == 1:
IntSecondary = 0
for i in range(65, 129):
if i in self.__Bitmap.keys():
IntSecondary |= (self.__Bitmap[i] & 0x1) << (128 - i)
Secondary = struct.pack("!Q", IntSecondary)
if(DataType == DT.BIN):
self.__iso += Secondary
elif(DataType == DT.ASCII):
self.__iso += binascii.hexlify(Secondary)
def BuildField(self, field):
try:
DataType = self.__IsoSpec.DataType(field)
LenType = self.__IsoSpec.LengthType(field)
ContentType = self.__IsoSpec.ContentType(field)
MaxLength = self.__IsoSpec.MaxLength(field)
except:
raise SpecError("Cannot parse F{0}: Incomplete field specification".format(field))
data = ""
if(LenType == LT.FIXED):
Len = MaxLength
if(ContentType == 'n'):
formatter = "{{0:0{0}d}}".format(Len)
elif('a' in ContentType or 'n' in ContentType or 's' in ContentType):
formatter = "{{0: >{0}}}".format(Len)
else:
formatter = "{0}"
data = formatter.format(self.__FieldData[field])
else:
LenDataType = self.__IsoSpec.LengthDataType(field)
data = "{0}".format(self.__FieldData[field])
Len = len(data)
if(DataType == DT.BIN):
Len //=2
if(Len > MaxLength):
raise BuildError("Cannot Build F{0}: Field Length larger than specification".format(field))
if(LenType == LT.LVAR):
LenData = "{0:01d}".format(Len)
elif(LenType == LT.LLVAR):
LenData = "{0:02d}".format(Len)
elif(LenType == LT.LLLVAR):
LenData = "{0:03d}".format(Len)
if(LenDataType == DT.ASCII):
self.__iso += LenData.encode('latin')
elif(LenDataType == DT.BCD):
self.__iso += Str2Bcd(LenData)
elif(LenDataType == DT.BIN):
self.__iso += binascii.unhexlify(LenData)
if(ContentType == 'z'):
data = data.replace("=", "D")
if(len(data) % 2 == 1):
data = data + 'F'
if(DataType == DT.ASCII):
self.__iso += data.encode('latin')
elif(DataType == DT.BCD):
self.__iso += Str2Bcd(data)
elif(DataType == DT.BIN):
self.__iso += binascii.unhexlify(self.__FieldData[field])
def BuildIso(self):
self.__iso = b''
self.BuildMTI()
self.BuildBitmap()
for field in sorted(self.__Bitmap):
if(field != 1 and self.Field(field) == 1):
self.BuildField(field)
return self.__iso
def Field(self, field, Value = None):
if(Value == None):
try:
return self.__Bitmap[field]
except KeyError:
return None
elif(Value == 1 or Value == 0):
self.__Bitmap[field] = Value
else:
raise ValueError
def FieldData(self, field, Value = None):
if(Value == None):
try:
return self.__FieldData[field]
except KeyError:
return None
else:
if(len(str(Value)) > self.__IsoSpec.MaxLength(field)):
raise ValueError('Value length larger than field maximum ({0})'.format(self.__IsoSpec.MaxLength(field)))
self.__FieldData[field] = Value
def Bitmap(self):
return self.__Bitmap
def MTI(self, MTI = None):
if(MTI == None):
return self.__MTI
else:
try: # MTI should only contain numbers
int(MTI)
except:
raise ValueError("Invalid MTI [{0}]: MTI must contain only numbers".format(MTI))
if(self.Strict == True):
if(MTI[1] == '0'):
raise ValueError("Invalid MTI [{0}]: Invalid Message type".format(MTI))
if(int(MTI[3]) > 5):
raise ValueError("Invalid MTI [{0}]: Invalid Message origin".format(MTI))
self.__MTI = MTI
def Description(self, field, Description = None):
return self.__IsoSpec.Description(field, Description)
def DataType(self, field, DataType = None):
return self.__IsoSpec.DataType(field, DataType)
def ContentType(self, field, ContentType = None):
return self.__IsoSpec.ContentType(field, ContentType)
def PrintMessage(self):
print("MTI: [{0}]".format(self.__MTI))
bitmapLine = "Fields: [ "
for i in sorted(self.__Bitmap.keys()):
if(i == 1):
continue
if(self.__Bitmap[i] == 1):
bitmapLine += str(i) + " "
bitmapLine += "]"
print(bitmapLine)
for i in sorted(self.__Bitmap.keys()):
if(i == 1):
continue
if(self.__Bitmap[i] == 1):
try:
FieldData = self.__FieldData[i]
except KeyError:
FieldData = ''
if(self.ContentType(i) == 'n' and self.__IsoSpec.LengthType(i) == LT.FIXED):
FieldData = str(FieldData).zfill(self.__IsoSpec.MaxLength(i))
Len = self.__FieldLen[i]
print("\t{0:>3d} - {1: <41} :({2:>3d}) [{3}]".format(i, self.__IsoSpec.Description(i), Len, FieldData))
def DictMessage(self):
dict_msg = {}
dict_msg['mti'] = "{0}".format(self.__MTI)
dict_msg['bitmap'] = []
for i in sorted(self.__Bitmap.keys()):
if(i == 1):
continue
if(self.__Bitmap[i] == 1):
dict_msg['bitmap'].append(i)
for i in sorted(self.__Bitmap.keys()):
if(i == 1):
continue
if(self.__Bitmap[i] == 1):
try:
FieldData = self.__FieldData[i]
except KeyError:
FieldData = ''
if(self.ContentType(i) == 'n' and self.__IsoSpec.LengthType(i) == LT.FIXED):
FieldData = str(FieldData).zfill(self.__IsoSpec.MaxLength(i))
Len = self.__FieldLen[i]
dict_msg["F{0:>03d}".format(i)] = {'data': FieldData, 'length': Len}
return dict_msg