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import base64, sys
stSpam, stHam, stDump = 0, 1, 2
# The markers parameters is in form ('start1', 'stop1'), ('start2', 'stop2')...
# Return is (marker-index, substrate)
def readPemBlocksFromFile(fileObj, *markers):
startMarkers = dict(map(lambda x: (x[1],x[0]),
enumerate(map(lambda x: x[0], markers))))
stopMarkers = dict(map(lambda x: (x[1],x[0]),
enumerate(map(lambda x: x[1], markers))))
idx = -1; substrate = ''
state = stSpam
while 1:
certLine = fileObj.readline()
if not certLine:
break
certLine = certLine.strip()
if state == stSpam:
if certLine in startMarkers:
certLines = []
idx = startMarkers[certLine]
state = stHam
continue
if state == stHam:
if certLine in stopMarkers and stopMarkers[certLine] == idx:
state = stDump
else:
certLines.append(certLine)
if state == stDump:
if sys.version_info[0] <= 2:
substrate = ''.join([ base64.b64decode(x) for x in certLines ])
else:
substrate = ''.encode().join([ base64.b64decode(x.encode()) for x in certLines ])
break
return idx, substrate
# Backward compatibility routine
def readPemFromFile(fileObj,
startMarker='-----BEGIN CERTIFICATE-----',
endMarker='-----END CERTIFICATE-----'):
idx, substrate = readPemBlocksFromFile(fileObj, (startMarker, endMarker))
return substrate
def readBase64FromFile(fileObj):
if sys.version_info[0] <= 2:
return ''.join([ base64.b64decode(x) for x in fileObj.readlines() ])
else:
return ''.encode().join(
[ base64.b64decode(x.encode()) for x in fileObj.readlines() ]
)