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114 lines
2.6 KiB
Python
114 lines
2.6 KiB
Python
# Various tools used by MIME-reading or MIME-writing programs.
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import string
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import rfc822
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# A derived class of rfc822.Message that knows about MIME headers and
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# contains some hooks for decoding encoded and multipart messages.
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class Message(rfc822.Message):
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def init(self, fp):
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self = rfc822.Message.init(self, fp)
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self.encodingheader = \
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self.getheader('content-transfer-encoding')
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self.typeheader = \
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self.getheader('content-type')
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self.parsetype()
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self.parseplist()
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return self
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def parsetype(self):
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str = self.typeheader
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if str == None:
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str = 'text/plain'
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if ';' in str:
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i = string.index(str, ';')
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self.plisttext = str[i:]
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str = str[:i]
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else:
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self.plisttext = ''
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fields = string.splitfields(str, '/')
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for i in range(len(fields)):
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fields[i] = string.lower(string.strip(fields[i]))
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self.type = string.joinfields(fields, '/')
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self.maintype = fields[0]
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self.subtype = string.joinfields(fields[1:], '/')
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def parseplist(self):
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str = self.plisttext
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self.plist = []
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while str[:1] == ';':
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str = str[1:]
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if ';' in str:
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# XXX Should parse quotes!
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end = string.index(str, ';')
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else:
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end = len(str)
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f = str[:end]
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if '=' in f:
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i = string.index(f, '=')
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f = string.lower(string.strip(f[:i])) + \
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'=' + string.strip(f[i+1:])
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self.plist.append(string.strip(f))
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def getplist(self):
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return self.plist
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def getparam(self, name):
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name = string.lower(name) + '='
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n = len(name)
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for p in self.plist:
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if p[:n] == name:
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return rfc822.unquote(p[n:])
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return None
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def getencoding(self):
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if self.encodingheader == None:
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return '7bit'
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return self.encodingheader
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def gettype(self):
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return self.type
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def getmaintype(self):
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return self.maintype
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def getsubtype(self):
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return self.subtype
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# Utility functions
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# -----------------
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# Return a random string usable as a multipart boundary.
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# The method used is so that it is *very* unlikely that the same
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# string of characters will every occur again in the Universe,
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# so the caller needn't check the data it is packing for the
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# occurrence of the boundary.
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#
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# The boundary contains dots so you have to quote it in the header.
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_prefix = None
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def choose_boundary():
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global _generation, _prefix, _timestamp
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import time
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import rand
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if _prefix == None:
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import socket
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import os
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hostid = socket.gethostbyname(socket.gethostname())
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uid = `os.getuid()`
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pid = `os.getpid()`
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seed = `rand.rand()`
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_prefix = hostid + '.' + uid + '.' + pid
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timestamp = `time.time()`
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seed = `rand.rand()`
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return _prefix + '.' + timestamp + '.' + seed
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