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POParsing Email BodyStructure in python
 

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  1. POParsing Email BodyStructure in python
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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/3973963/parsing-parenthesized-list-in-pythons-imaplib">parsing parenthesized list in python&#39;s imaplib</a> </p> </blockquote> <p>Python's email package lets you take the full text of an email message and parse it into parts and walk through the various parts. However, is there a library to parse the <code>BODYSTRUCTURE</code> response returned by the IMAP protocol into <code>email.message.Message</code> parts?</p> <p><strong>EDIT:</strong></p> <p>The equivalent method in PHP is <a href="http://www.php.net/manual/en/function.imap-fetchstructure.php" rel="nofollow noreferrer"><code>imap_fetchbody()</code></a>, which handles the parsing of structure automatically. </p> <p><strong>EDIT2</strong>:</p> <p>This question had been incorrectly closed as a duplicate. It is about parsing the <code>BODYSTRUCTURE</code> nested expression into a useful format (such as a dictionary) and not about parsing the raw string into python type. In any case, I ended up rolling my own solution and here's the code for anyone who comes across a similar problem in the future. It is intended to be used together with the <code>imapclient</code> library</p> <pre><code># ----- Parsing BODYSTRUCTURE into parts dictionaries ----- # def tuple2dict(pairs): """get dict from (key, value, key, value, ...) tuple""" if not pairs: return None return dict([(k, tuple2dict(v) if isinstance(v, tuple) else v) for k, v in zip(pairs[::2], pairs[1::2])]) def parse_singlepart(var, part_no): """convert non-multipart into dic""" # Basic fields for non-multipart (Required) part = dict(zip(['maintype', 'subtype', 'params', 'id', 'description', 'encoding', 'size'], var[:7]), part_no=part_no) part['params'] = tuple2dict(part['params']) # Type specific fields (Required for 'message' or 'text' type) index = 7 if part['maintype'].lower() == 'message' and part['subtype'].lower() == 'rfc822': part.update(zip(['envelope', 'bodystructure', 'lines'], var[7:10])) index = 10 elif part['maintype'].lower() == 'text': part['lines'] = var[7] index = 8 # Extension fields for non-multipart (Optional) part.update(zip(['md5', 'disposition', 'language', 'location'], var[index:])) part['disposition'] = tuple2dict(part['disposition']) return part def parse_multipart(var, part_no): """convert the multipart into dict""" part = { 'child_parts': [], 'part_no': part_no } # First parse the child parts index = 0 if isinstance(var[0], list): part['child_parts'] = [parse_part(v, ('%s.%d' % (part_no, i+1)).replace('TEXT.', '')) for i, v in enumerate(var[0])] index = 1 elif isinstance(var[0], tuple): while isinstance(var[index], tuple): part['child_parts'].append(parse_part(var[index], ('%s.%d' % (part_no, index+1)).replace('TEXT.', ''))) index += 1 # Then parse the required field subtype and optional extension fields part.update(zip(['subtype', 'params', 'disposition', 'language', 'location'], var[index:])) part['params'] = tuple2dict(part['params']) part['disposition'] = tuple2dict(part['disposition']) return part def parse_part(var, part_no=None): """Parse IMAP email BODYSTRUCTURE into nested dictionary See http://tools.ietf.org/html/rfc3501#section-6.4.5 for structure of email messages See http://tools.ietf.org/html/rfc3501#section-7.4.2 for specification of BODYSTRUCTURE """ if isinstance(var[0], (tuple, list)): return parse_multipart(var, part_no or 'TEXT') else: return parse_singlepart(var, part_no or '1') </code></pre>
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