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__metaclass__ = type
__all__ = [
'make_json_message',
'MemoryStore',
'SUPPORTED_DISPLAY_TYPES',
'SUPPORTED_ORDERS',
]
import email
import simplejson
from urlparse import parse_qs
from grackle.error import (
ArchiveIdExists,
ArchiveIdNotFound,
MessageIdNotFound,
UnparsableDateRange,
UnsupportedDisplayType,
UnsupportedOrder,
)
SUPPORTED_DISPLAY_TYPES = set(['all', 'text-only', 'headers-only'])
SUPPORTED_ORDERS = set(
['date', 'author', 'subject', 'thread_newest', 'thread_oldest',
'thread_subject'])
def threaded_messages(messages):
threads = {}
count = 0
pending = []
for message in messages:
if message.get('replies') is None:
threads[message['message_id']] = [message]
count += 1
else:
pending.append(message)
for message in pending:
threads[message['replies']].append(message)
return threads.values()
def get_body_text(message):
"""Return the first plain/text messaage part."""
if not message.is_multipart():
return message.get_payload()
for part in email.iterators.typed_subpart_iterator(message, 'multipart'):
subparts = part.get_payload()
for subpart in subparts:
if subpart.get_content_type() == 'text/plain':
return subpart.get_payload().strip()
return ''
def make_json_message(message_id, raw_message, hidden=False):
message = email.message_from_string(raw_message)
headers = dict(message.items())
message = {
'message_id': message_id,
'headers': headers,
# This is broken because the in-reply-to must be encoded.
# X-Message-ID-Hash is calculated from the Base 32.
'thread_id': headers.get('in-reply-to', message_id),
'date': headers.get('date'),
'subject': headers.get('subject'),
'author': headers.get('from'),
'hidden': hidden,
'attachments': [],
'replies': headers.get('in-reply-to'),
'body': get_body_text(message),
}
return message
class MemoryStore:
"""A memory-backed message store."""
def __init__(self, message_archives):
"""Constructor."""
self.message_archives = message_archives
@staticmethod
def is_multipart(message):
return isinstance(message['body'], list)
def put_archive(self, archive_id, raw_archive=None):
# XXX sinzui 2012-02-29: this needs to raise an error
# if the th archive_id is invalid, or the raw archive is not mbox.
if archive_id in self.message_archives:
raise ArchiveIdExists()
self.message_archives[archive_id] = []
def put_message(self, archive_id, message_id, raw_message):
# XXX sinzui 2012-02-29: this needs to raise an error
# if the th archive_id is invalid, message_id is not base32
# or the raw message is not an email.
if archive_id not in self.message_archives:
raise ArchiveIdNotFound()
if not raw_message:
raise ValueError('raw_message is not a message.')
json_message = make_json_message(message_id, raw_message)
messages = self.message_archives[archive_id]
messages.append(json_message)
def get_messages(self, archive_id, query_string):
"""Return matching messages.
:param archive_id: The archive to retrieve from.
:param query_string: Contains 'parameters', which is a JSON-format
string describing parameters.
"""
query = parse_qs(query_string)
parameters = simplejson.loads(query['parameters'][0])
order = parameters.get('order')
messages = self.message_archives[archive_id]
if order is not None:
if order not in SUPPORTED_ORDERS:
raise UnsupportedOrder
elif order.startswith('thread_'):
threaded = threaded_messages(messages)
messages = []
if order == 'thread_subject':
threaded.sort(key=lambda t: t[0]['subject'])
if order == 'thread_oldest':
threaded.sort(key=lambda t: min(m['date'] for m in t))
if order == 'thread_newest':
threaded.sort(key=lambda t: max(m['date'] for m in t))
for thread in threaded:
messages.extend(thread)
else:
messages.sort(key=lambda m: m[order])
display_type = parameters.get('display_type', 'all')
if display_type not in SUPPORTED_DISPLAY_TYPES:
raise UnsupportedDisplayType
if 'date_range' in parameters:
try:
start_date, end_date = parameters['date_range'].split('..')
if not start_date or not end_date:
raise UnparsableDateRange
except ValueError:
raise UnparsableDateRange
new_messages = []
for message in messages:
if (not parameters['include_hidden'] and message['hidden']):
continue
if ('message_ids' in parameters
and message['message_id'] not in parameters['message_ids']):
continue
if ('date_range' in parameters
and (message['date'] < start_date
or message['date'] > end_date)):
continue
message = dict(message)
if 'headers' in parameters:
headers = dict(
(k, v) for k, v in message['headers'].iteritems()
if k in parameters['headers'])
message['headers'] = headers
if display_type == 'headers-only':
del message['body']
elif display_type == 'text-only' and self.is_multipart(message):
text_parts = [
part.get_payload() for part in message['body']
if part.get_content_type() == 'text/plain']
message['body'] = '\n\n'.join(text_parts)
elif display_type == 'all' and self.is_multipart(message):
parts = [str(part.get_payload()) for part in message['body']]
message['body'] = '\n\n'.join(parts)
max_body = parameters.get('max_body_length')
if max_body is not None and display_type != 'headers-only':
message['body'] = message['body'][:max_body]
new_messages.append(message)
messages = new_messages
limit = parameters.get('limit', 100)
memo = parameters.get('memo')
message_id_indices = dict(
(m['message_id'], idx) for idx, m in enumerate(messages))
if memo is None:
start = 0
else:
start = message_id_indices[memo.encode('rot13')]
if start > 0:
previous_memo = messages[start - 1]['message_id'].encode('rot13')
else:
previous_memo = None
end = min(start + limit, len(messages))
if end < len(messages):
next_memo = messages[end]['message_id'].encode('rot13')
else:
next_memo = None
messages = messages[start:end]
response = {
'messages': messages,
'next_memo': next_memo,
'previous_memo': previous_memo
}
return response
def hide_message(self, archive_id, message_id, query_string):
"""Change the visbility of a message in an archive.
:param archive_id: The archive to retrieve from.
:param query_string: Contains 'parameters', which is a JSON-format
string describing parameters.
"""
query = parse_qs(query_string)
parameters = simplejson.loads(query['parameters'][0])
hidden = parameters['hidden']
messages = self.message_archives[archive_id]
for message in messages:
if message['message_id'] == message_id:
message['hidden'] = hidden
response = {
'message_id': message_id,
'hidden': hidden,
}
return response
raise MessageIdNotFound
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