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import os

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from binascii import hexlify

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restart_stunnel_cmdline = ["/etc/init.d/S50stunnel","restart"]

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def pskgen(ID, pskpath):

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    secretstring = hexlify(os.urandom(256))

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    pskstring = ID+":"+secretstring

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    with open(pskpath, 'w') as f:

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        f.write(pskstring)

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    call(restart_stunnel_cmdline)

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def ensurepsk(ID, pskpath):

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    # check if already there

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    if not os.path.exists(pskpath):

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        # create if needed

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        pskgen(IS, pskpath)

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