132 lines
4.7 KiB
Python
132 lines
4.7 KiB
Python
# Copyright The IETF Trust 2016-2020, All Rights Reserved
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# -*- coding: utf-8 -*-
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# various utilities for working with the mailarch mail archive at
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# mailarchive.ietf.org
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import base64
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import contextlib
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import datetime
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import email.utils
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import hashlib
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import mailbox
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import tarfile
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import tempfile
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from pyquery import PyQuery
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from urllib.parse import urlencode
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from urllib.request import urlopen
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import debug # pyflakes:ignore
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from django.conf import settings
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from django.utils.encoding import force_bytes, force_str
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from ietf.utils.mail import get_payload_text
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from ietf.utils.timezone import datetime_today
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def list_name_from_email(list_email):
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if not list_email.endswith("@ietf.org"):
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return None
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return list_email[:-len("@ietf.org")]
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def hash_list_message_id(list_name, msgid):
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# hash in mailarch is computed similar to
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# https://www.mail-archive.com/faq.html#listserver except the list
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# name (without "@ietf.org") is used instead of the full address,
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# and rightmost "=" signs are (optionally) stripped
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sha = hashlib.sha1(force_bytes(msgid))
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sha.update(force_bytes(list_name))
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return force_str(base64.urlsafe_b64encode(sha.digest()).rstrip(b"="))
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def construct_query_urls(doc, team, query=None):
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list_name = list_name_from_email(team.list_email)
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if not list_name:
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return None
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if not query:
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query = doc.name
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encoded_query = "?" + urlencode({
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"qdr": "c", # custom time frame
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"start_date": (datetime_today() - datetime.timedelta(days=180)).isoformat(),
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"email_list": list_name,
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"q": "subject:({})".format(query),
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"as": "1", # this is an advanced search
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})
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return {
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"query": query,
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"query_url": settings.MAILING_LIST_ARCHIVE_URL + "/arch/search/" + encoded_query,
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"query_data_url": settings.MAILING_LIST_ARCHIVE_URL + "/arch/export/mbox/" + encoded_query,
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}
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def construct_message_url(list_name, msgid):
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return "{}/arch/msg/{}/{}".format(settings.MAILING_LIST_ARCHIVE_URL, list_name, hash_list_message_id(list_name, msgid))
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def retrieve_messages_from_mbox(mbox_fileobj):
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"""Return selected content in message from mbox from mailarch."""
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res = []
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with tempfile.NamedTemporaryFile(suffix=".mbox") as mbox_file:
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# mailbox.mbox needs a path, so we need to put the contents
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# into a file
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mbox_data = mbox_fileobj.read()
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mbox_file.write(mbox_data)
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mbox_file.flush()
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mbox = mailbox.mbox(mbox_file.name, create=False)
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for msg in mbox:
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content = ""
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for part in msg.walk():
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if part.get_content_type() == "text/plain":
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charset = part.get_content_charset() or "utf-8"
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content += get_payload_text(part, default_charset=charset)
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# parse a couple of things for the front end
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utcdate = None
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d = email.utils.parsedate_tz(msg["Date"])
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if d:
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utcdate = datetime.datetime.fromtimestamp(email.utils.mktime_tz(d))
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res.append({
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"from": msg["From"],
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"splitfrom": email.utils.parseaddr(msg["From"]),
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"subject": msg["Subject"],
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"content": content.replace("\r\n", "\n").replace("\r", "\n").strip("\n"),
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"message_id": email.utils.unquote(msg["Message-ID"].strip()),
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"url": email.utils.unquote(msg["Archived-At"].strip()),
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"date": msg["Date"],
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"utcdate": (utcdate.date().isoformat(), utcdate.time().isoformat()) if utcdate else ("", ""),
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})
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return res
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def retrieve_messages(query_data_url):
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"""Retrieve and return selected content from mailarch."""
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res = []
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# This has not been rewritten to use requests.get() because get() does
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# not handle file URLs out of the box, which we need for tesing
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with contextlib.closing(urlopen(query_data_url, timeout=15)) as fileobj:
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content_type = fileobj.info()["Content-type"]
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if not content_type.startswith("application/x-tar"):
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if content_type.startswith("text/html"):
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r = fileobj.read(20000)
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q = PyQuery(r)
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div = q('div[class~="no-results"]')
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if div:
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raise KeyError("No results: %s -> %s" % (query_data_url, div.text(), ))
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raise Exception("Export failed - this usually means no matches were found")
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with tarfile.open(fileobj=fileobj, mode='r|*') as tar:
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for entry in tar:
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if entry.isfile():
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mbox_fileobj = tar.extractfile(entry)
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res.extend(retrieve_messages_from_mbox(mbox_fileobj))
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return res
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