~unity-2d-team/unity-2d/Shell-MultiMonitor

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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