| 1 | """Various tools used by MIME-reading or MIME-writing programs."""
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| 2 |
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| 3 |
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| 4 | import os
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| 5 | import rfc822
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| 6 | import tempfile
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| 7 |
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| 8 | __all__ = ["Message","choose_boundary","encode","decode","copyliteral",
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| 9 | "copybinary"]
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| 10 |
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| 11 | class Message(rfc822.Message):
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| 12 | """A derived class of rfc822.Message that knows about MIME headers and
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| 13 | contains some hooks for decoding encoded and multipart messages."""
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| 14 |
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| 15 | def __init__(self, fp, seekable = 1):
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| 16 | rfc822.Message.__init__(self, fp, seekable)
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| 17 | self.encodingheader = \
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| 18 | self.getheader('content-transfer-encoding')
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| 19 | self.typeheader = \
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| 20 | self.getheader('content-type')
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| 21 | self.parsetype()
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| 22 | self.parseplist()
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| 23 |
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| 24 | def parsetype(self):
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| 25 | str = self.typeheader
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| 26 | if str is None:
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| 27 | str = 'text/plain'
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| 28 | if ';' in str:
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| 29 | i = str.index(';')
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| 30 | self.plisttext = str[i:]
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| 31 | str = str[:i]
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| 32 | else:
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| 33 | self.plisttext = ''
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| 34 | fields = str.split('/')
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| 35 | for i in range(len(fields)):
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| 36 | fields[i] = fields[i].strip().lower()
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| 37 | self.type = '/'.join(fields)
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| 38 | self.maintype = fields[0]
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| 39 | self.subtype = '/'.join(fields[1:])
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| 40 |
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| 41 | def parseplist(self):
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| 42 | str = self.plisttext
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| 43 | self.plist = []
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| 44 | while str[:1] == ';':
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| 45 | str = str[1:]
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| 46 | if ';' in str:
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| 47 | # XXX Should parse quotes!
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| 48 | end = str.index(';')
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| 49 | else:
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| 50 | end = len(str)
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| 51 | f = str[:end]
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| 52 | if '=' in f:
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| 53 | i = f.index('=')
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| 54 | f = f[:i].strip().lower() + \
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| 55 | '=' + f[i+1:].strip()
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| 56 | self.plist.append(f.strip())
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| 57 | str = str[end:]
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| 58 |
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| 59 | def getplist(self):
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| 60 | return self.plist
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| 61 |
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| 62 | def getparam(self, name):
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| 63 | name = name.lower() + '='
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| 64 | n = len(name)
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| 65 | for p in self.plist:
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| 66 | if p[:n] == name:
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| 67 | return rfc822.unquote(p[n:])
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| 68 | return None
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| 69 |
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| 70 | def getparamnames(self):
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| 71 | result = []
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| 72 | for p in self.plist:
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| 73 | i = p.find('=')
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| 74 | if i >= 0:
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| 75 | result.append(p[:i].lower())
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| 76 | return result
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| 77 |
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| 78 | def getencoding(self):
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| 79 | if self.encodingheader is None:
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| 80 | return '7bit'
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| 81 | return self.encodingheader.lower()
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| 82 |
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| 83 | def gettype(self):
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| 84 | return self.type
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| 85 |
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| 86 | def getmaintype(self):
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| 87 | return self.maintype
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| 88 |
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| 89 | def getsubtype(self):
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| 90 | return self.subtype
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| 91 |
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| 92 |
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| 93 |
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| 94 |
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| 95 | # Utility functions
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| 96 | # -----------------
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| 97 |
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| 98 | try:
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| 99 | import thread
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| 100 | except ImportError:
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| 101 | import dummy_thread as thread
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| 102 | _counter_lock = thread.allocate_lock()
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| 103 | del thread
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| 104 |
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| 105 | _counter = 0
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| 106 | def _get_next_counter():
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| 107 | global _counter
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| 108 | _counter_lock.acquire()
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| 109 | _counter += 1
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| 110 | result = _counter
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| 111 | _counter_lock.release()
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| 112 | return result
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| 113 |
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| 114 | _prefix = None
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| 115 |
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| 116 | def choose_boundary():
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| 117 | """Return a string usable as a multipart boundary.
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| 118 |
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| 119 | The string chosen is unique within a single program run, and
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| 120 | incorporates the user id (if available), process id (if available),
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| 121 | and current time. So it's very unlikely the returned string appears
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