1 | n/a | # Copyright (C) 2001-2006 Python Software Foundation |
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2 | n/a | # Author: Barry Warsaw |
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3 | n/a | # Contact: email-sig@python.org |
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4 | n/a | |
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5 | n/a | """Encodings and related functions.""" |
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6 | n/a | |
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7 | n/a | __all__ = [ |
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8 | n/a | 'encode_7or8bit', |
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9 | n/a | 'encode_base64', |
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10 | n/a | 'encode_noop', |
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11 | n/a | 'encode_quopri', |
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12 | n/a | ] |
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13 | n/a | |
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14 | n/a | |
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15 | n/a | from base64 import encodebytes as _bencode |
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16 | n/a | from quopri import encodestring as _encodestring |
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17 | n/a | |
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18 | n/a | |
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19 | n/a | |
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20 | n/a | def _qencode(s): |
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21 | n/a | enc = _encodestring(s, quotetabs=True) |
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22 | n/a | # Must encode spaces, which quopri.encodestring() doesn't do |
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23 | n/a | return enc.replace(b' ', b'=20') |
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24 | n/a | |
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25 | n/a | |
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26 | n/a | def encode_base64(msg): |
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27 | n/a | """Encode the message's payload in Base64. |
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28 | n/a | |
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29 | n/a | Also, add an appropriate Content-Transfer-Encoding header. |
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30 | n/a | """ |
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31 | n/a | orig = msg.get_payload(decode=True) |
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32 | n/a | encdata = str(_bencode(orig), 'ascii') |
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33 | n/a | msg.set_payload(encdata) |
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34 | n/a | msg['Content-Transfer-Encoding'] = 'base64' |
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35 | n/a | |
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36 | n/a | |
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37 | n/a | |
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38 | n/a | def encode_quopri(msg): |
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39 | n/a | """Encode the message's payload in quoted-printable. |
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40 | n/a | |
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41 | n/a | Also, add an appropriate Content-Transfer-Encoding header. |
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42 | n/a | """ |
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43 | n/a | orig = msg.get_payload(decode=True) |
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44 | n/a | encdata = _qencode(orig) |
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45 | n/a | msg.set_payload(encdata) |
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46 | n/a | msg['Content-Transfer-Encoding'] = 'quoted-printable' |
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47 | n/a | |
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48 | n/a | |
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49 | n/a | |
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50 | n/a | def encode_7or8bit(msg): |
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51 | n/a | """Set the Content-Transfer-Encoding header to 7bit or 8bit.""" |
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52 | n/a | orig = msg.get_payload(decode=True) |
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53 | n/a | if orig is None: |
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54 | n/a | # There's no payload. For backwards compatibility we use 7bit |
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55 | n/a | msg['Content-Transfer-Encoding'] = '7bit' |
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56 | n/a | return |
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57 | n/a | # We play a trick to make this go fast. If decoding from ASCII succeeds, |
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58 | n/a | # we know the data must be 7bit, otherwise treat it as 8bit. |
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59 | n/a | try: |
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60 | n/a | orig.decode('ascii') |
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61 | n/a | except UnicodeError: |
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62 | n/a | msg['Content-Transfer-Encoding'] = '8bit' |
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63 | n/a | else: |
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64 | n/a | msg['Content-Transfer-Encoding'] = '7bit' |
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65 | n/a | |
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66 | n/a | |
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67 | n/a | |
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68 | n/a | def encode_noop(msg): |
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69 | n/a | """Do nothing.""" |
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