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+# -*- coding: utf-8 -*-
+# walk.py
+# Copyright (C) 2013-2015 LEAP
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+"""
+Walk a message tree and generate documents that can be inserted in the backend
+store.
+"""
+from email.parser import Parser
+
+from cryptography.hazmat.backends.multibackend import MultiBackend
+from cryptography.hazmat.backends.openssl.backend import (
+ Backend as OpenSSLBackend)
+from cryptography.hazmat.primitives import hashes
+
+from leap.mail.utils import first
+
+crypto_backend = MultiBackend([OpenSSLBackend()])
+
+_parser = Parser()
+
+
+def get_tree(msg):
+ p = {}
+ p['ctype'] = msg.get_content_type()
+ p['headers'] = msg.items()
+
+ payload = msg.get_payload()
+ is_multi = msg.is_multipart()
+ if is_multi:
+ p['part_map'] = dict(
+ [(idx, get_tree(part)) for idx, part in enumerate(payload, 1)])
+ p['parts'] = len(payload)
+ p['phash'] = None
+ else:
+ p['parts'] = 0
+ p['size'] = len(payload)
+ p['phash'] = get_hash(payload)
+ p['part_map'] = {}
+ p['multi'] = is_multi
+ return p
+
+
+def get_tree_from_string(messagestr):
+ return get_tree(_parser.parsestr(messagestr))
+
+
+def get_body_phash(msg):
+ """
+ Find the body payload-hash for this message.
+ """
+ for part in msg.walk():
+ # XXX what other ctypes should be considered body?
+ if part.get_content_type() in ("text/plain", "text/html"):
+ # XXX avoid hashing again
+ return get_hash(part.get_payload())
+
+
+def get_raw_docs(msg):
+ """
+ We get also some of the headers to be able to
+ index the content. Here we remove any mutable part, as the the filename
+ in the content disposition.
+ """
+ return (
+ {'type': 'cnt',
+ 'raw': part.get_payload(),
+ 'phash': get_hash(part.get_payload()),
+ 'content-type': part.get_content_type(),
+ 'content-disposition': first(part.get(
+ 'content-disposition', '').split(';')),
+ 'content-transfer-encoding': part.get(
+ 'content-transfer-encoding', '')
+ } for part in msg.walk() if not isinstance(part.get_payload(), list))
+
+
+def get_hash(s):
+ digest = hashes.Hash(hashes.SHA256(), crypto_backend)
+ digest.update(s)
+ return digest.finalize().encode("hex").upper()
+
+
+"""
+Groucho Marx: Now pay particular attention to this first clause, because it's
+ most important. There's the party of the first part shall be
+ known in this contract as the party of the first part. How do you
+ like that, that's pretty neat eh?
+
+Chico Marx: No, that's no good.
+Groucho Marx: What's the matter with it?
+
+Chico Marx: I don't know, let's hear it again.
+Groucho Marx: So the party of the first part shall be known in this contract as
+ the party of the first part.
+"""