mirror of
https://github.com/python/cpython.git
synced 2024-11-30 10:41:14 +01:00
129 lines
3.7 KiB
Python
129 lines
3.7 KiB
Python
"""Generic MIME writer.
|
|
|
|
Classes:
|
|
|
|
MimeWriter - the only thing here.
|
|
|
|
"""
|
|
|
|
|
|
import string
|
|
import mimetools
|
|
|
|
|
|
class MimeWriter:
|
|
|
|
"""Generic MIME writer.
|
|
|
|
Methods:
|
|
|
|
__init__()
|
|
addheader()
|
|
flushheaders()
|
|
startbody()
|
|
startmultipartbody()
|
|
nextpart()
|
|
lastpart()
|
|
|
|
A MIME writer is much more primitive than a MIME parser. It
|
|
doesn't seek around on the output file, and it doesn't use large
|
|
amounts of buffer space, so you have to write the parts in the
|
|
order they should occur on the output file. It does buffer the
|
|
headers you add, allowing you to rearrange their order.
|
|
|
|
General usage is:
|
|
|
|
f = <open the output file>
|
|
w = MimeWriter(f)
|
|
...call w.addheader(key, value) 0 or more times...
|
|
|
|
followed by either:
|
|
|
|
f = w.startbody(content_type)
|
|
...call f.write(data) for body data...
|
|
|
|
or:
|
|
|
|
w.startmultipartbody(subtype)
|
|
for each part:
|
|
subwriter = w.nextpart()
|
|
...use the subwriter's methods to create the subpart...
|
|
w.lastpart()
|
|
|
|
The subwriter is another MimeWriter instance, and should be
|
|
treated in the same way as the toplevel MimeWriter. This way,
|
|
writing recursive body parts is easy.
|
|
|
|
Warning: don't forget to call lastpart()!
|
|
|
|
XXX There should be more state so calls made in the wrong order
|
|
are detected.
|
|
|
|
Some special cases:
|
|
|
|
- startbody() just returns the file passed to the constructor;
|
|
but don't use this knowledge, as it may be changed.
|
|
|
|
- startmultipartbody() actually returns a file as well;
|
|
this can be used to write the initial 'if you can read this your
|
|
mailer is not MIME-aware' message.
|
|
|
|
- If you call flushheaders(), the headers accumulated so far are
|
|
written out (and forgotten); this is useful if you don't need a
|
|
body part at all, e.g. for a subpart of type message/rfc822
|
|
that's (mis)used to store some header-like information.
|
|
|
|
- Passing a keyword argument 'prefix=<flag>' to addheader(),
|
|
start*body() affects where the header is inserted; 0 means
|
|
append at the end, 1 means insert at the start; default is
|
|
append for addheader(), but insert for start*body(), which use
|
|
it to determine where the Content-Type header goes.
|
|
|
|
"""
|
|
|
|
def __init__(self, fp):
|
|
self._fp = fp
|
|
self._headers = []
|
|
|
|
def addheader(self, key, value, prefix=0):
|
|
lines = string.splitfields(value, "\n")
|
|
while lines and not lines[-1]: del lines[-1]
|
|
while lines and not lines[0]: del lines[0]
|
|
for i in range(1, len(lines)):
|
|
lines[i] = " " + string.strip(lines[i])
|
|
value = string.joinfields(lines, "\n") + "\n"
|
|
line = key + ": " + value
|
|
if prefix:
|
|
self._headers.insert(0, line)
|
|
else:
|
|
self._headers.append(line)
|
|
|
|
def flushheaders(self):
|
|
self._fp.writelines(self._headers)
|
|
self._headers = []
|
|
|
|
def startbody(self, ctype, plist=[], prefix=1):
|
|
for name, value in plist:
|
|
ctype = ctype + ';\n %s=\"%s\"' % (name, value)
|
|
self.addheader("Content-Type", ctype, prefix=prefix)
|
|
self.flushheaders()
|
|
self._fp.write("\n")
|
|
return self._fp
|
|
|
|
def startmultipartbody(self, subtype, boundary=None, plist=[], prefix=1):
|
|
self._boundary = boundary or mimetools.choose_boundary()
|
|
return self.startbody("multipart/" + subtype,
|
|
[("boundary", self._boundary)] + plist,
|
|
prefix=prefix)
|
|
|
|
def nextpart(self):
|
|
self._fp.write("\n--" + self._boundary + "\n")
|
|
return self.__class__(self._fp)
|
|
|
|
def lastpart(self):
|
|
self._fp.write("\n--" + self._boundary + "--\n")
|
|
|
|
|
|
if __name__ == '__main__':
|
|
import test.test_MimeWriter
|