imip-agent

Annotated imip_manager.py

260:6ce516322f0f
2015-02-05 Paul Boddie Exclude the user as attendee from receiving mail sent when acting as organiser.
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#!/usr/bin/env python
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"""
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A Web interface to a user's calendar.
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Copyright (C) 2014, 2015 Paul Boddie <paul@boddie.org.uk>
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3 of the License, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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this program.  If not, see <http://www.gnu.org/licenses/>.
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"""
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# Edit this path to refer to the location of the imiptools libraries, if
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# necessary.
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LIBRARY_PATH = "/var/lib/imip-agent"
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from datetime import date, datetime, timedelta
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import babel.dates
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import cgi, os, sys
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sys.path.append(LIBRARY_PATH)
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from imiptools.content import Handler
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from imiptools.data import get_address, get_uri, make_freebusy, parse_object, \
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                           Object, to_part
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from imiptools.dates import format_datetime, get_datetime, get_datetime_item, \
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                            get_end_of_day, get_start_of_day, get_start_of_next_day, \
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                            get_timestamp, ends_on_same_day, next_date, to_timezone
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from imiptools.mail import Messenger
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from imiptools.period import add_day_start_points, add_slots, convert_periods, \
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                             get_freebusy_details, \
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                             get_scale, have_conflict, get_slots, get_spans, \
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                             partition_by_day
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from imiptools.profile import Preferences
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import imip_store
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import markup
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getenv = os.environ.get
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setenv = os.environ.__setitem__
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class CGIEnvironment:
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    "A CGI-compatible environment."
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    def __init__(self, charset=None):
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        self.charset = charset
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        self.args = None
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        self.method = None
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        self.path = None
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        self.path_info = None
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        self.user = None
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    def get_args(self):
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        if self.args is None:
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            if self.get_method() != "POST":
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                setenv("QUERY_STRING", "")
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            args = cgi.parse(keep_blank_values=True)
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            if not self.charset:
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                self.args = args
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            else:
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                self.args = {}
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                for key, values in args.items():
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                    self.args[key] = [unicode(value, self.charset) for value in values]
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        return self.args
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    def get_method(self):
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        if self.method is None:
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            self.method = getenv("REQUEST_METHOD") or "GET"
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        return self.method
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    def get_path(self):
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        if self.path is None:
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            self.path = getenv("SCRIPT_NAME") or ""
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        return self.path
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    def get_path_info(self):
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        if self.path_info is None:
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            self.path_info = getenv("PATH_INFO") or ""
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        return self.path_info
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    def get_user(self):
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        if self.user is None:
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            self.user = getenv("REMOTE_USER") or ""
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        return self.user
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    def get_output(self):
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        return sys.stdout
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    def get_url(self):
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        path = self.get_path()
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        path_info = self.get_path_info()
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        return "%s%s" % (path.rstrip("/"), path_info)
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    def new_url(self, path_info):
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        path = self.get_path()
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        return "%s/%s" % (path.rstrip("/"), path_info.lstrip("/"))
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class ManagerHandler(Handler):
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    """
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    A content handler for use by the manager, as opposed to operating within the
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    mail processing pipeline.
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    """
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    def __init__(self, obj, user, messenger):
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        Handler.__init__(self, messenger=messenger)
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        self.set_object(obj)
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        self.user = user
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        self.organiser = self.obj.get_value("ORGANIZER")
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        self.attendees = self.obj.get_values("ATTENDEE")
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    # Communication methods.
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    def send_message(self, method, sender, for_organiser):
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        """
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        Create a full calendar object employing the given 'method', and send it
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        to the appropriate recipients, also sending a copy to the 'sender'. The
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        'for_organiser' value indicates whether the organiser is sending this
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        message.
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        """
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        parts = [self.obj.to_part(method)]
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        # As organiser, send an invitation to attendees, excluding oneself if
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        # also attending. The updated event will be saved by the outgoing
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        # handler.
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        if for_organiser:
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            recipients = [get_address(attendee) for attendee in self.attendees if attendee != self.user]
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        else:
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            recipients = [get_address(self.organiser)]
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        # Bundle free/busy information if appropriate.
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        preferences = Preferences(self.user)
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        if preferences.get("freebusy_sharing") == "share" and \
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           preferences.get("freebusy_bundling") == "always":
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            # Invent a unique identifier.
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            utcnow = get_timestamp()
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            uid = "imip-agent-%s-%s" % (utcnow, get_address(self.user))
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            freebusy = self.store.get_freebusy(self.user)
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            parts.append(to_part("PUBLISH", [make_freebusy(freebusy, uid, self.user)]))
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        message = self.messenger.make_outgoing_message(parts, recipients, outgoing_bcc=sender)
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        self.messenger.sendmail(recipients, message.as_string(), outgoing_bcc=sender)
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    # Action methods.
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    def process_received_request(self, accept, update=False):
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        """
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        Process the current request for the given 'user', accepting any request
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        when 'accept' is true, declining requests otherwise. Return whether any
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        action was taken.
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        If 'update' is given, the sequence number will be incremented in order
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        to override any previous response.
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        """
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        # When accepting or declining, do so only on behalf of this user,
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        # preserving any other attributes set as an attendee.
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        for attendee, attendee_attr in self.obj.get_items("ATTENDEE"):
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            if attendee == self.user:
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                attendee_attr["PARTSTAT"] = accept and "ACCEPTED" or "DECLINED"
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                if self.messenger and self.messenger.sender != get_address(attendee):
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                    attendee_attr["SENT-BY"] = get_uri(self.messenger.sender)
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                self.obj["ATTENDEE"] = [(attendee, attendee_attr)]
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                if update:
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                    sequence = self.obj.get_value("SEQUENCE") or "0"
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                    self.obj["SEQUENCE"] = [(str(int(sequence) + 1), {})]
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                self.update_dtstamp()
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                self.send_message("REPLY", get_address(attendee), for_organiser=False)
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                return True
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        return False
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    def process_created_request(self, method, update=False):
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        """
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        Process the current request for the given 'user', sending a created
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        request of the given 'method' to attendees. Return whether any action
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        was taken.
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        If 'update' is given, the sequence number will be incremented in order
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        to override any previous message.
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        """
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        organiser, organiser_attr = self.obj.get_item("ORGANIZER")
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        if self.messenger and self.messenger.sender != get_address(organiser):
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            organiser_attr["SENT-BY"] = get_uri(self.messenger.sender)
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        if update:
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            sequence = self.obj.get_value("SEQUENCE") or "0"
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            self.obj["SEQUENCE"] = [(str(int(sequence) + 1), {})]
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        self.update_dtstamp()
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        self.send_message(method, get_address(self.organiser), for_organiser=True)
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        return True
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class Manager:
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    "A simple manager application."
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    def __init__(self, messenger=None):
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        self.messenger = messenger or Messenger()
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        self.encoding = "utf-8"
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        self.env = CGIEnvironment(self.encoding)
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        user = self.env.get_user()
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        self.user = user and get_uri(user) or None
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        self.preferences = None
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        self.locale = None
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        self.requests = None
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        self.out = self.env.get_output()
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        self.page = markup.page()
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        self.store = imip_store.FileStore()
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        self.objects = {}
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        try:
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            self.publisher = imip_store.FilePublisher()
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        except OSError:
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            self.publisher = None
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    def _get_uid(self, path_info):
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        return path_info.lstrip("/").split("/", 1)[0]
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    def _get_object(self, uid):
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        if self.objects.has_key(uid):
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            return self.objects[uid]
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        f = uid and self.store.get_event(self.user, uid) or None
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        if not f:
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            return None
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        fragment = parse_object(f, "utf-8")
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        obj = self.objects[uid] = fragment and Object(fragment)
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        return obj
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    def _get_requests(self):
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        if self.requests is None:
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            self.requests = self.store.get_requests(self.user)
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        return self.requests
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    def _get_request_summary(self):
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        summary = []
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        for uid in self._get_requests():
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            obj = self._get_object(uid)
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            if obj:
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                summary.append((
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                    obj.get_value("DTSTART"),
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                    obj.get_value("DTEND"),
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                    uid
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                    ))
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        return summary
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    # Preference methods.
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    def get_user_locale(self):
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        if not self.locale:
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            self.locale = self.get_preferences().get("LANG", "C")
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        return self.locale
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    def get_preferences(self):
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        if not self.preferences:
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            self.preferences = Preferences(self.user)
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        return self.preferences
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    def get_tzid(self):
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        prefs = self.get_preferences()
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        return prefs.get("TZID", "UTC")
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    # Prettyprinting of dates and times.
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    def format_date(self, dt, format):
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        return self._format_datetime(babel.dates.format_date, dt, format)
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    def format_time(self, dt, format):
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        return self._format_datetime(babel.dates.format_time, dt, format)
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    def format_datetime(self, dt, format):
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        return self._format_datetime(
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            isinstance(dt, datetime) and babel.dates.format_datetime or babel.dates.format_date,
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            dt, format)
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    def format_end_datetime(self, dt, format):
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        if isinstance(dt, date) and not isinstance(dt, datetime):
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            dt = dt - timedelta(1)
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        return self.format_datetime(dt, format)
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    def _format_datetime(self, fn, dt, format):
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        return fn(dt, format=format, locale=self.get_user_locale())
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    # Data management methods.
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    def remove_request(self, uid):
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        return self.store.dequeue_request(self.user, uid)
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    def remove_event(self, uid):
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        return self.store.remove_event(self.user, uid)
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    # Presentation methods.
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    def new_page(self, title):
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        self.page.init(title=title, charset=self.encoding, css=self.env.new_url("styles.css"))
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    def status(self, code, message):
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        self.header("Status", "%s %s" % (code, message))
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    def header(self, header, value):
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        print >>self.out, "%s: %s" % (header, value)
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    def no_user(self):
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        self.status(403, "Forbidden")
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        self.new_page(title="Forbidden")
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        self.page.p("You are not logged in and thus cannot access scheduling requests.")
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    def no_page(self):
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        self.status(404, "Not Found")
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        self.new_page(title="Not Found")
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        self.page.p("No page is provided at the given address.")
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    def redirect(self, url):
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        self.status(302, "Redirect")
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        self.header("Location", url)
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        self.new_page(title="Redirect")
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        self.page.p("Redirecting to: %s" % url)
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    # Request logic methods.
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    def handle_newevent(self):
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        """
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        Handle any new event operation, creating a new event and redirecting to
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        the event page for further activity.
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        """
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        # Handle a submitted form.
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        args = self.env.get_args()
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        if not args.has_key("newevent"):
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            return
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        # Create a new event using the available information.
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        slots = args.get("slot", [])
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        participants = args.get("participants", [])
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        if not slots:
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            return
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        # Coalesce the selected slots.
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        slots.sort()
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        coalesced = []
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        last = None
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        for slot in slots:
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            start, end = slot.split("-")
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            end = end or next_date(start)
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            if last:
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                last_start, last_end = last
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                # Merge adjacent dates and datetimes.
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                if start == last_end:
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                    last = last_start, end
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                    continue
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                # Handle datetimes within dates.
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                # Datetime periods are within single days and are therefore
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                # discarded.
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                elif start.startswith(last_start):
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                    continue
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                # Add separate dates and datetimes.
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                else:
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                    coalesced.append(last)
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            last = start, end
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        if last:
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            coalesced.append(last)
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        # Obtain the user's timezone.
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        tzid = self.get_tzid()
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        # Invent a unique identifier.
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        utcnow = get_timestamp()
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        uid = "imip-agent-%s-%s" % (utcnow, get_address(self.user))
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        # Define a single occurrence if only one coalesced slot exists.
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        # Otherwise, many occurrences are defined.
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        for i, (start, end) in enumerate(coalesced):
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            this_uid = "%s-%s" % (uid, i)
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            start = get_datetime(start, {"TZID" : tzid})
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            end = end and get_datetime(end, {"TZID" : tzid}) or get_start_of_next_day(start, tzid)
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            start_value, start_attr = get_datetime_item(start, tzid)
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            end_value, end_attr = get_datetime_item(end, tzid)
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            # Create a calendar object and store it as a request.
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            record = []
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            rwrite = record.append
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            rwrite(("UID", {}, this_uid))
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            rwrite(("SUMMARY", {}, "New event at %s" % utcnow))
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            rwrite(("DTSTAMP", {}, utcnow))
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            rwrite(("DTSTART", start_attr, start_value))
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            rwrite(("DTEND", end_attr, end_value))
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            rwrite(("ORGANIZER", {}, self.user))
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            for participant in participants:
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                if not participant:
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                    continue
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                participant = get_uri(participant)
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                rwrite(("ATTENDEE", {"RSVP" : "TRUE", "PARTSTAT" : "NEEDS-ACTION"}, participant))
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            obj = ("VEVENT", {}, record)
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            self.store.set_event(self.user, this_uid, obj)
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            self.store.queue_request(self.user, this_uid)
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        # Redirect to the object (or the first of the objects), where instead of
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        # attendee controls, there will be organiser controls.
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        self.redirect(self.env.new_url("%s-0" % uid))
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    def handle_request(self, uid, obj, queued):
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        """
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        Handle actions involving the given 'uid' and 'obj' object, where
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        'queued' indicates that the object has not yet been handled.
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        """
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        # Handle a submitted form.
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        args = self.env.get_args()
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        handled = True
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        # Update the object.
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        if args.has_key("summary"):
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            obj["SUMMARY"] = [(args["summary"][0], {})]
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        if args.has_key("partstat"):
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            attendees = obj.get_value_map("ATTENDEE")
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            if attendees.has_key(self.user):
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                attendees[self.user]["PARTSTAT"] = args["partstat"][0]
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        # Process any action.
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        accept = args.has_key("accept")
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        decline = args.has_key("decline")
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        discard = args.has_key("discard")
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        invite = args.has_key("invite")
paul@255 492
        cancel = args.has_key("cancel")
paul@257 493
        save = args.has_key("save")
paul@155 494
        update = not queued and args.has_key("update")
paul@121 495
paul@255 496
        if accept or decline or invite or cancel:
paul@121 497
paul@212 498
            handler = ManagerHandler(obj, self.user, self.messenger)
paul@121 499
paul@212 500
            # Process the object and remove it from the list of requests.
paul@121 501
paul@207 502
            if (accept or decline) and handler.process_received_request(accept, update) or \
paul@255 503
               (invite or cancel) and handler.process_created_request(invite and "REQUEST" or "CANCEL", update):
paul@121 504
paul@121 505
                self.remove_request(uid)
paul@121 506
paul@257 507
        # Save single user events.
paul@121 508
paul@257 509
        elif save:
paul@257 510
            self.store.set_event(self.user, uid, obj.to_node())
paul@257 511
            freebusy = self.store.get_freebusy(self.user)
paul@257 512
            self.remove_request(uid)
paul@121 513
paul@257 514
        # Remove the request and the object.
paul@257 515
paul@257 516
        elif discard:
paul@234 517
            self.remove_event(uid)
paul@121 518
            self.remove_request(uid)
paul@121 519
paul@121 520
        else:
paul@123 521
            handled = False
paul@121 522
paul@212 523
        # Upon handling an action, redirect to the main page.
paul@212 524
paul@123 525
        if handled:
paul@123 526
            self.redirect(self.env.get_path())
paul@123 527
paul@123 528
        return handled
paul@121 529
paul@246 530
    # Page fragment methods.
paul@246 531
paul@254 532
    def show_request_controls(self, obj, needs_update):
paul@155 533
paul@155 534
        """
paul@212 535
        Show form controls for a request concerning 'obj', indicating whether
paul@254 536
        an update will be performed if 'needs_update' is specified as a true
paul@254 537
        value.
paul@155 538
        """
paul@155 539
paul@212 540
        page = self.page
paul@212 541
paul@213 542
        is_organiser = obj.get_value("ORGANIZER") == self.user
paul@207 543
paul@253 544
        attendees = obj.get_value_map("ATTENDEE")
paul@253 545
        is_attendee = attendees.has_key(self.user)
paul@253 546
        attendee_attr = attendees.get(self.user)
paul@121 547
paul@257 548
        have_other_attendees = len(attendees) > (is_attendee and 1 or 0)
paul@257 549
paul@257 550
        # Show appropriate options depending on the role of the user.
paul@257 551
paul@257 552
        if is_attendee and not is_organiser:
paul@253 553
            partstat = attendee_attr.get("PARTSTAT")
paul@253 554
            if partstat == "ACCEPTED":
paul@253 555
                page.p("This request has been accepted.")
paul@253 556
            elif partstat == "DECLINED":
paul@253 557
                page.p("This request has been declined.")
paul@253 558
            else:
paul@253 559
                page.p("This request has not yet been dealt with.")
paul@121 560
paul@255 561
            if needs_update:
paul@255 562
                page.p("This request can be updated as follows:")
paul@255 563
            else:
paul@255 564
                page.p("An action is required for this request:")
paul@253 565
paul@255 566
            page.p()
paul@212 567
            page.input(name="accept", type="submit", value="Accept")
paul@212 568
            page.add(" ")
paul@212 569
            page.input(name="decline", type="submit", value="Decline")
paul@255 570
            page.add(" ")
paul@255 571
            page.input(name="discard", type="submit", value="Discard")
paul@255 572
            page.p.close()
paul@207 573
paul@255 574
        if is_organiser:
paul@257 575
            if have_other_attendees:
paul@257 576
                if needs_update:
paul@257 577
                    page.p("As organiser, you can perform the following:")
paul@257 578
                else:
paul@257 579
                    page.p("As organiser, you will need to perform an action:")
paul@255 580
paul@257 581
                page.p()
paul@257 582
                page.input(name="invite", type="submit", value="Invite")
paul@257 583
                page.add(" ")
paul@257 584
                page.input(name="cancel", type="submit", value="Cancel")
paul@257 585
                page.p.close()
paul@257 586
            else:
paul@257 587
                page.p()
paul@257 588
                page.input(name="save", type="submit", value="Save")
paul@257 589
                page.p.close()
paul@207 590
paul@207 591
        # Updated objects need to have details updated upon sending.
paul@207 592
paul@254 593
        if needs_update:
paul@212 594
            page.input(name="update", type="hidden", value="true")
paul@207 595
paul@210 596
    object_labels = {
paul@210 597
        "SUMMARY"   : "Summary",
paul@210 598
        "DTSTART"   : "Start",
paul@210 599
        "DTEND"     : "End",
paul@210 600
        "ORGANIZER" : "Organiser",
paul@210 601
        "ATTENDEE"  : "Attendee",
paul@210 602
        }
paul@210 603
paul@257 604
    partstat_items = [
paul@257 605
        ("NEEDS-ACTION", "Not confirmed"),
paul@257 606
        ("ACCEPTED", "Attending"),
paul@259 607
        ("TENTATIVE", "Tentatively attending"),
paul@257 608
        ("DECLINED", "Not attending"),
paul@257 609
        ]
paul@257 610
paul@254 611
    def show_object_on_page(self, uid, obj, needs_update):
paul@121 612
paul@121 613
        """
paul@121 614
        Show the calendar object with the given 'uid' and representation 'obj'
paul@121 615
        on the current page.
paul@121 616
        """
paul@121 617
paul@210 618
        page = self.page
paul@212 619
        page.form(method="POST")
paul@210 620
paul@154 621
        # Obtain the user's timezone.
paul@154 622
paul@244 623
        tzid = self.get_tzid()
paul@121 624
paul@121 625
        # Provide a summary of the object.
paul@121 626
paul@230 627
        page.table(class_="object", cellspacing=5, cellpadding=5)
paul@212 628
        page.thead()
paul@212 629
        page.tr()
paul@212 630
        page.th("Event", class_="mainheading", colspan=2)
paul@212 631
        page.tr.close()
paul@212 632
        page.thead.close()
paul@212 633
        page.tbody()
paul@121 634
paul@121 635
        for name in ["SUMMARY", "DTSTART", "DTEND", "ORGANIZER", "ATTENDEE"]:
paul@210 636
            page.tr()
paul@210 637
paul@210 638
            label = self.object_labels.get(name, name)
paul@210 639
paul@210 640
            # Handle datetimes specially.
paul@210 641
paul@147 642
            if name in ["DTSTART", "DTEND"]:
paul@213 643
                value, attr = obj.get_item(name)
paul@154 644
                tzid = attr.get("TZID", tzid)
paul@232 645
                value = (
paul@232 646
                    name == "DTSTART" and self.format_datetime or self.format_end_datetime
paul@232 647
                    )(to_timezone(get_datetime(value), tzid), "full")
paul@210 648
                page.th(label, class_="objectheading")
paul@210 649
                page.td(value)
paul@210 650
                page.tr.close()
paul@210 651
paul@212 652
            # Handle the summary specially.
paul@212 653
paul@212 654
            elif name == "SUMMARY":
paul@213 655
                value = obj.get_value(name)
paul@212 656
                page.th(label, class_="objectheading")
paul@212 657
                page.td()
paul@212 658
                page.input(name="summary", type="text", value=value, size=80)
paul@212 659
                page.td.close()
paul@212 660
                page.tr.close()
paul@212 661
paul@210 662
            # Handle potentially many values.
paul@210 663
paul@147 664
            else:
paul@213 665
                items = obj.get_items(name)
paul@233 666
                if not items:
paul@233 667
                    continue
paul@233 668
paul@210 669
                page.th(label, class_="objectheading", rowspan=len(items))
paul@210 670
paul@210 671
                first = True
paul@210 672
paul@210 673
                for value, attr in items:
paul@210 674
                    if not first:
paul@210 675
                        page.tr()
paul@210 676
                    else:
paul@210 677
                        first = False
paul@121 678
paul@210 679
                    page.td()
paul@210 680
                    page.add(value)
paul@210 681
paul@210 682
                    if name == "ATTENDEE":
paul@210 683
                        partstat = attr.get("PARTSTAT")
paul@259 684
                        if partstat and value == self.user:
paul@257 685
                            self._show_menu("partstat", partstat, self.partstat_items)
paul@210 686
paul@210 687
                    page.td.close()
paul@210 688
                    page.tr.close()
paul@210 689
paul@212 690
        page.tbody.close()
paul@210 691
        page.table.close()
paul@121 692
paul@213 693
        dtstart = format_datetime(obj.get_utc_datetime("DTSTART"))
paul@213 694
        dtend = format_datetime(obj.get_utc_datetime("DTEND"))
paul@121 695
paul@121 696
        # Indicate whether there are conflicting events.
paul@121 697
paul@121 698
        freebusy = self.store.get_freebusy(self.user)
paul@121 699
paul@121 700
        if freebusy:
paul@121 701
paul@121 702
            # Obtain any time zone details from the suggested event.
paul@121 703
paul@213 704
            _dtstart, attr = obj.get_item("DTSTART")
paul@154 705
            tzid = attr.get("TZID", tzid)
paul@121 706
paul@121 707
            # Show any conflicts.
paul@121 708
paul@121 709
            for t in have_conflict(freebusy, [(dtstart, dtend)], True):
paul@121 710
                start, end, found_uid = t[:3]
paul@154 711
paul@154 712
                # Provide details of any conflicting event.
paul@154 713
paul@121 714
                if uid != found_uid:
paul@149 715
                    start = self.format_datetime(to_timezone(get_datetime(start), tzid), "full")
paul@149 716
                    end = self.format_datetime(to_timezone(get_datetime(end), tzid), "full")
paul@210 717
                    page.p("Event conflicts with another from %s to %s: " % (start, end))
paul@154 718
paul@154 719
                    # Show the event summary for the conflicting event.
paul@154 720
paul@154 721
                    found_obj = self._get_object(found_uid)
paul@154 722
                    if found_obj:
paul@213 723
                        page.a(found_obj.get_value("SUMMARY"), href=self.env.new_url(found_uid))
paul@121 724
paul@254 725
        self.show_request_controls(obj, needs_update)
paul@212 726
        page.form.close()
paul@212 727
paul@121 728
    def show_requests_on_page(self):
paul@69 729
paul@69 730
        "Show requests for the current user."
paul@69 731
paul@69 732
        # NOTE: This list could be more informative, but it is envisaged that
paul@69 733
        # NOTE: the requests would be visited directly anyway.
paul@69 734
paul@121 735
        requests = self._get_requests()
paul@70 736
paul@185 737
        self.page.div(id="pending-requests")
paul@185 738
paul@80 739
        if requests:
paul@114 740
            self.page.p("Pending requests:")
paul@114 741
paul@80 742
            self.page.ul()
paul@69 743
paul@80 744
            for request in requests:
paul@165 745
                obj = self._get_object(request)
paul@165 746
                if obj:
paul@165 747
                    self.page.li()
paul@213 748
                    self.page.a(obj.get_value("SUMMARY"), href="#request-%s" % request)
paul@165 749
                    self.page.li.close()
paul@80 750
paul@80 751
            self.page.ul.close()
paul@80 752
paul@80 753
        else:
paul@80 754
            self.page.p("There are no pending requests.")
paul@69 755
paul@185 756
        self.page.div.close()
paul@185 757
paul@185 758
    def show_participants_on_page(self):
paul@185 759
paul@185 760
        "Show participants for scheduling purposes."
paul@185 761
paul@185 762
        args = self.env.get_args()
paul@185 763
        participants = args.get("participants", [])
paul@185 764
paul@185 765
        try:
paul@185 766
            for name, value in args.items():
paul@185 767
                if name.startswith("remove-participant-"):
paul@185 768
                    i = int(name[len("remove-participant-"):])
paul@185 769
                    del participants[i]
paul@185 770
                    break
paul@185 771
        except ValueError:
paul@185 772
            pass
paul@185 773
paul@185 774
        # Trim empty participants.
paul@185 775
paul@185 776
        while participants and not participants[-1].strip():
paul@185 777
            participants.pop()
paul@185 778
paul@185 779
        # Show any specified participants together with controls to remove and
paul@185 780
        # add participants.
paul@185 781
paul@185 782
        self.page.div(id="participants")
paul@185 783
paul@185 784
        self.page.p("Participants for scheduling:")
paul@185 785
paul@185 786
        for i, participant in enumerate(participants):
paul@185 787
            self.page.p()
paul@185 788
            self.page.input(name="participants", type="text", value=participant)
paul@185 789
            self.page.input(name="remove-participant-%d" % i, type="submit", value="Remove")
paul@185 790
            self.page.p.close()
paul@185 791
paul@185 792
        self.page.p()
paul@185 793
        self.page.input(name="participants", type="text")
paul@185 794
        self.page.input(name="add-participant", type="submit", value="Add")
paul@185 795
        self.page.p.close()
paul@185 796
paul@185 797
        self.page.div.close()
paul@185 798
paul@185 799
        return participants
paul@185 800
paul@121 801
    # Full page output methods.
paul@70 802
paul@121 803
    def show_object(self, path_info):
paul@70 804
paul@121 805
        "Show an object request using the given 'path_info' for the current user."
paul@70 806
paul@121 807
        uid = self._get_uid(path_info)
paul@121 808
        obj = self._get_object(uid)
paul@121 809
paul@121 810
        if not obj:
paul@70 811
            return False
paul@70 812
paul@123 813
        is_request = uid in self._get_requests()
paul@155 814
        handled = self.handle_request(uid, obj, is_request)
paul@77 815
paul@123 816
        if handled:
paul@123 817
            return True
paul@73 818
paul@123 819
        self.new_page(title="Event")
paul@254 820
        self.show_object_on_page(uid, obj, not is_request)
paul@73 821
paul@70 822
        return True
paul@70 823
paul@114 824
    def show_calendar(self):
paul@114 825
paul@114 826
        "Show the calendar for the current user."
paul@114 827
paul@202 828
        handled = self.handle_newevent()
paul@202 829
paul@114 830
        self.new_page(title="Calendar")
paul@162 831
        page = self.page
paul@162 832
paul@196 833
        # Form controls are used in various places on the calendar page.
paul@196 834
paul@196 835
        page.form(method="POST")
paul@196 836
paul@121 837
        self.show_requests_on_page()
paul@185 838
        participants = self.show_participants_on_page()
paul@114 839
paul@196 840
        # Show a button for scheduling a new event.
paul@196 841
paul@230 842
        page.p(class_="controls")
paul@196 843
        page.input(name="newevent", type="submit", value="New event", id="newevent")
paul@258 844
        page.input(name="reset", type="submit", value="Clear selections", id="reset")
paul@196 845
        page.p.close()
paul@196 846
paul@231 847
        # Show controls for hiding empty and busy slots.
paul@203 848
        # The positioning of the control, paragraph and table are important here.
paul@203 849
paul@203 850
        page.input(name="hideslots", type="checkbox", value="hide", id="hideslots")
paul@231 851
        page.input(name="hidebusy", type="checkbox", value="hide", id="hidebusy")
paul@203 852
paul@230 853
        page.p(class_="controls")
paul@237 854
        page.label("Hide busy time periods", for_="hidebusy", class_="hidebusy enable")
paul@237 855
        page.label("Show busy time periods", for_="hidebusy", class_="hidebusy disable")
paul@237 856
        page.label("Hide unused time periods", for_="hideslots", class_="hideslots enable")
paul@237 857
        page.label("Show unused time periods", for_="hideslots", class_="hideslots disable")
paul@203 858
        page.p.close()
paul@203 859
paul@114 860
        freebusy = self.store.get_freebusy(self.user)
paul@114 861
paul@114 862
        if not freebusy:
paul@114 863
            page.p("No events scheduled.")
paul@114 864
            return
paul@114 865
paul@154 866
        # Obtain the user's timezone.
paul@147 867
paul@244 868
        tzid = self.get_tzid()
paul@147 869
paul@114 870
        # Day view: start at the earliest known day and produce days until the
paul@114 871
        # latest known day, perhaps with expandable sections of empty days.
paul@114 872
paul@114 873
        # Month view: start at the earliest known month and produce months until
paul@114 874
        # the latest known month, perhaps with expandable sections of empty
paul@114 875
        # months.
paul@114 876
paul@114 877
        # Details of users to invite to new events could be superimposed on the
paul@114 878
        # calendar.
paul@114 879
paul@185 880
        # Requests are listed and linked to their tentative positions in the
paul@185 881
        # calendar. Other participants are also shown.
paul@185 882
paul@185 883
        request_summary = self._get_request_summary()
paul@185 884
paul@185 885
        period_groups = [request_summary, freebusy]
paul@185 886
        period_group_types = ["request", "freebusy"]
paul@185 887
        period_group_sources = ["Pending requests", "Your schedule"]
paul@185 888
paul@187 889
        for i, participant in enumerate(participants):
paul@185 890
            period_groups.append(self.store.get_freebusy_for_other(self.user, get_uri(participant)))
paul@187 891
            period_group_types.append("freebusy-part%d" % i)
paul@185 892
            period_group_sources.append(participant)
paul@114 893
paul@162 894
        groups = []
paul@162 895
        group_columns = []
paul@185 896
        group_types = period_group_types
paul@185 897
        group_sources = period_group_sources
paul@162 898
        all_points = set()
paul@162 899
paul@162 900
        # Obtain time point information for each group of periods.
paul@162 901
paul@185 902
        for periods in period_groups:
paul@162 903
            periods = convert_periods(periods, tzid)
paul@162 904
paul@162 905
            # Get the time scale with start and end points.
paul@162 906
paul@162 907
            scale = get_scale(periods)
paul@162 908
paul@162 909
            # Get the time slots for the periods.
paul@162 910
paul@162 911
            slots = get_slots(scale)
paul@162 912
paul@162 913
            # Add start of day time points for multi-day periods.
paul@162 914
paul@244 915
            add_day_start_points(slots, tzid)
paul@162 916
paul@162 917
            # Record the slots and all time points employed.
paul@162 918
paul@162 919
            groups.append(slots)
paul@201 920
            all_points.update([point for point, active in slots])
paul@162 921
paul@162 922
        # Partition the groups into days.
paul@162 923
paul@162 924
        days = {}
paul@162 925
        partitioned_groups = []
paul@171 926
        partitioned_group_types = []
paul@185 927
        partitioned_group_sources = []
paul@162 928
paul@185 929
        for slots, group_type, group_source in zip(groups, group_types, group_sources):
paul@162 930
paul@162 931
            # Propagate time points to all groups of time slots.
paul@162 932
paul@162 933
            add_slots(slots, all_points)
paul@162 934
paul@162 935
            # Count the number of columns employed by the group.
paul@162 936
paul@162 937
            columns = 0
paul@162 938
paul@162 939
            # Partition the time slots by day.
paul@162 940
paul@162 941
            partitioned = {}
paul@162 942
paul@162 943
            for day, day_slots in partition_by_day(slots).items():
paul@201 944
                intervals = []
paul@201 945
                last = None
paul@201 946
paul@201 947
                for point, active in day_slots:
paul@201 948
                    columns = max(columns, len(active))
paul@201 949
                    if last:
paul@201 950
                        intervals.append((last, point))
paul@201 951
                    last = point
paul@201 952
paul@201 953
                if last:
paul@201 954
                    intervals.append((last, None))
paul@162 955
paul@162 956
                if not days.has_key(day):
paul@162 957
                    days[day] = set()
paul@162 958
paul@162 959
                # Convert each partition to a mapping from points to active
paul@162 960
                # periods.
paul@162 961
paul@201 962
                partitioned[day] = dict(day_slots)
paul@201 963
paul@201 964
                # Record the divisions or intervals within each day.
paul@201 965
paul@201 966
                days[day].update(intervals)
paul@162 967
paul@194 968
            if group_type != "request" or columns:
paul@194 969
                group_columns.append(columns)
paul@194 970
                partitioned_groups.append(partitioned)
paul@194 971
                partitioned_group_types.append(group_type)
paul@194 972
                partitioned_group_sources.append(group_source)
paul@114 973
paul@243 974
        self.show_calendar_day_controls(days)
paul@243 975
paul@230 976
        page.table(cellspacing=5, cellpadding=5, class_="calendar")
paul@188 977
        self.show_calendar_participant_headings(partitioned_group_types, partitioned_group_sources, group_columns)
paul@171 978
        self.show_calendar_days(days, partitioned_groups, partitioned_group_types, group_columns)
paul@162 979
        page.table.close()
paul@114 980
paul@196 981
        # End the form region.
paul@196 982
paul@196 983
        page.form.close()
paul@196 984
paul@246 985
    # More page fragment methods.
paul@246 986
paul@243 987
    def show_calendar_day_controls(self, days):
paul@243 988
paul@243 989
        "Show controls for the given 'days' in the calendar."
paul@243 990
paul@243 991
        page = self.page
paul@243 992
        slots = self.env.get_args().get("slot", [])
paul@243 993
paul@243 994
        for day in days:
paul@243 995
            value, identifier = self._day_value_and_identifier(day)
paul@243 996
            self._slot_selector(value, identifier, slots)
paul@243 997
paul@243 998
        # Generate a dynamic stylesheet to allow day selections to colour
paul@243 999
        # specific days.
paul@243 1000
        # NOTE: The style details need to be coordinated with the static
paul@243 1001
        # NOTE: stylesheet.
paul@243 1002
paul@243 1003
        page.style(type="text/css")
paul@243 1004
paul@243 1005
        for day in days:
paul@243 1006
            daystr = format_datetime(day)
paul@243 1007
            page.add("""\
paul@249 1008
input.newevent.selector#day-%s-:checked ~ table label.day.day-%s,
paul@249 1009
input.newevent.selector#day-%s-:checked ~ table label.timepoint.day-%s {
paul@243 1010
    background-color: #5f4;
paul@243 1011
    text-decoration: underline;
paul@243 1012
}
paul@243 1013
""" % (daystr, daystr, daystr, daystr))
paul@243 1014
paul@243 1015
        page.style.close()
paul@243 1016
paul@188 1017
    def show_calendar_participant_headings(self, group_types, group_sources, group_columns):
paul@186 1018
paul@186 1019
        """
paul@186 1020
        Show headings for the participants and other scheduling contributors,
paul@188 1021
        defined by 'group_types', 'group_sources' and 'group_columns'.
paul@186 1022
        """
paul@186 1023
paul@185 1024
        page = self.page
paul@185 1025
paul@188 1026
        page.colgroup(span=1, id="columns-timeslot")
paul@186 1027
paul@188 1028
        for group_type, columns in zip(group_types, group_columns):
paul@191 1029
            page.colgroup(span=max(columns, 1), id="columns-%s" % group_type)
paul@186 1030
paul@185 1031
        page.thead()
paul@185 1032
        page.tr()
paul@185 1033
        page.th("", class_="emptyheading")
paul@185 1034
paul@193 1035
        for group_type, source, columns in zip(group_types, group_sources, group_columns):
paul@193 1036
            page.th(source,
paul@193 1037
                class_=(group_type == "request" and "requestheading" or "participantheading"),
paul@193 1038
                colspan=max(columns, 1))
paul@185 1039
paul@185 1040
        page.tr.close()
paul@185 1041
        page.thead.close()
paul@185 1042
paul@171 1043
    def show_calendar_days(self, days, partitioned_groups, partitioned_group_types, group_columns):
paul@186 1044
paul@186 1045
        """
paul@186 1046
        Show calendar days, defined by a collection of 'days', the contributing
paul@186 1047
        period information as 'partitioned_groups' (partitioned by day), the
paul@186 1048
        'partitioned_group_types' indicating the kind of contribution involved,
paul@186 1049
        and the 'group_columns' defining the number of columns in each group.
paul@186 1050
        """
paul@186 1051
paul@162 1052
        page = self.page
paul@162 1053
paul@191 1054
        # Determine the number of columns required. Where participants provide
paul@191 1055
        # no columns for events, one still needs to be provided for the
paul@191 1056
        # participant itself.
paul@147 1057
paul@191 1058
        all_columns = sum([max(columns, 1) for columns in group_columns])
paul@191 1059
paul@191 1060
        # Determine the days providing time slots.
paul@191 1061
paul@162 1062
        all_days = days.items()
paul@162 1063
        all_days.sort()
paul@162 1064
paul@162 1065
        # Produce a heading and time points for each day.
paul@162 1066
paul@201 1067
        for day, intervals in all_days:
paul@186 1068
            page.thead()
paul@114 1069
            page.tr()
paul@243 1070
            page.th(class_="dayheading container", colspan=all_columns+1)
paul@239 1071
            self._day_heading(day)
paul@114 1072
            page.th.close()
paul@153 1073
            page.tr.close()
paul@186 1074
            page.thead.close()
paul@114 1075
paul@162 1076
            groups_for_day = [partitioned.get(day) for partitioned in partitioned_groups]
paul@162 1077
paul@186 1078
            page.tbody()
paul@201 1079
            self.show_calendar_points(intervals, groups_for_day, partitioned_group_types, group_columns)
paul@186 1080
            page.tbody.close()
paul@185 1081
paul@201 1082
    def show_calendar_points(self, intervals, groups, group_types, group_columns):
paul@186 1083
paul@186 1084
        """
paul@201 1085
        Show the time 'intervals' along with period information from the given
paul@186 1086
        'groups', having the indicated 'group_types', each with the number of
paul@186 1087
        columns given by 'group_columns'.
paul@186 1088
        """
paul@186 1089
paul@162 1090
        page = self.page
paul@162 1091
paul@244 1092
        # Obtain the user's timezone.
paul@244 1093
paul@244 1094
        tzid = self.get_tzid()
paul@244 1095
paul@203 1096
        # Produce a row for each interval.
paul@162 1097
paul@201 1098
        intervals = list(intervals)
paul@201 1099
        intervals.sort()
paul@162 1100
paul@201 1101
        for point, endpoint in intervals:
paul@244 1102
            continuation = point == get_start_of_day(point, tzid)
paul@153 1103
paul@203 1104
            # Some rows contain no period details and are marked as such.
paul@203 1105
paul@203 1106
            have_active = reduce(lambda x, y: x or y, [slots.get(point) for slots in groups], None)
paul@203 1107
paul@203 1108
            css = " ".join(
paul@203 1109
                ["slot"] +
paul@231 1110
                (have_active and ["busy"] or ["empty"]) +
paul@203 1111
                (continuation and ["daystart"] or [])
paul@203 1112
                )
paul@203 1113
paul@203 1114
            page.tr(class_=css)
paul@162 1115
            page.th(class_="timeslot")
paul@201 1116
            self._time_point(point, endpoint)
paul@162 1117
            page.th.close()
paul@162 1118
paul@162 1119
            # Obtain slots for the time point from each group.
paul@162 1120
paul@171 1121
            for columns, slots, group_type in zip(group_columns, groups, group_types):
paul@162 1122
                active = slots and slots.get(point)
paul@162 1123
paul@191 1124
                # Where no periods exist for the given time interval, generate
paul@191 1125
                # an empty cell. Where a participant provides no periods at all,
paul@191 1126
                # the colspan is adjusted to be 1, not 0.
paul@191 1127
paul@162 1128
                if not active:
paul@196 1129
                    page.td(class_="empty container", colspan=max(columns, 1))
paul@201 1130
                    self._empty_slot(point, endpoint)
paul@196 1131
                    page.td.close()
paul@162 1132
                    continue
paul@162 1133
paul@162 1134
                slots = slots.items()
paul@162 1135
                slots.sort()
paul@162 1136
                spans = get_spans(slots)
paul@162 1137
paul@162 1138
                # Show a column for each active period.
paul@117 1139
paul@153 1140
                for t in active:
paul@185 1141
                    if t and len(t) >= 2:
paul@185 1142
                        start, end, uid, key = get_freebusy_details(t)
paul@185 1143
                        span = spans[key]
paul@171 1144
paul@171 1145
                        # Produce a table cell only at the start of the period
paul@171 1146
                        # or when continued at the start of a day.
paul@171 1147
paul@153 1148
                        if point == start or continuation:
paul@153 1149
paul@195 1150
                            has_continued = continuation and point != start
paul@244 1151
                            will_continue = not ends_on_same_day(point, end, tzid)
paul@195 1152
                            css = " ".join(
paul@195 1153
                                ["event"] +
paul@195 1154
                                (has_continued and ["continued"] or []) +
paul@195 1155
                                (will_continue and ["continues"] or [])
paul@195 1156
                                )
paul@195 1157
paul@189 1158
                            # Only anchor the first cell of events.
paul@189 1159
paul@189 1160
                            if point == start:
paul@195 1161
                                page.td(class_=css, rowspan=span, id="%s-%s" % (group_type, uid))
paul@189 1162
                            else:
paul@195 1163
                                page.td(class_=css, rowspan=span)
paul@171 1164
paul@153 1165
                            obj = self._get_object(uid)
paul@185 1166
paul@185 1167
                            if not obj:
paul@185 1168
                                page.span("")
paul@185 1169
                            else:
paul@213 1170
                                summary = obj.get_value("SUMMARY")
paul@171 1171
paul@171 1172
                                # Only link to events if they are not being
paul@171 1173
                                # updated by requests.
paul@171 1174
paul@171 1175
                                if uid in self._get_requests() and group_type != "request":
paul@189 1176
                                    page.span(summary)
paul@164 1177
                                else:
paul@171 1178
                                    href = "%s/%s" % (self.env.get_url().rstrip("/"), uid)
paul@189 1179
                                    page.a(summary, href=href)
paul@171 1180
paul@153 1181
                            page.td.close()
paul@153 1182
                    else:
paul@196 1183
                        page.td(class_="empty container")
paul@201 1184
                        self._empty_slot(point, endpoint)
paul@196 1185
                        page.td.close()
paul@114 1186
paul@166 1187
                # Pad with empty columns.
paul@166 1188
paul@166 1189
                i = columns - len(active)
paul@166 1190
                while i > 0:
paul@166 1191
                    i -= 1
paul@196 1192
                    page.td(class_="empty container")
paul@201 1193
                    self._empty_slot(point, endpoint)
paul@196 1194
                    page.td.close()
paul@166 1195
paul@162 1196
            page.tr.close()
paul@114 1197
paul@239 1198
    def _day_heading(self, day):
paul@243 1199
paul@243 1200
        """
paul@243 1201
        Generate a heading for 'day' of the following form:
paul@243 1202
paul@243 1203
        <label class="day day-20150203" for="day-20150203">Tuesday, 3 February 2015</label>
paul@243 1204
        """
paul@243 1205
paul@239 1206
        page = self.page
paul@243 1207
        daystr = format_datetime(day)
paul@239 1208
        value, identifier = self._day_value_and_identifier(day)
paul@243 1209
        page.label(self.format_date(day, "full"), class_="day day-%s" % daystr, for_=identifier)
paul@239 1210
paul@201 1211
    def _time_point(self, point, endpoint):
paul@243 1212
paul@243 1213
        """
paul@243 1214
        Generate headings for the 'point' to 'endpoint' period of the following
paul@243 1215
        form:
paul@243 1216
paul@243 1217
        <label class="timepoint day-20150203" for="slot-20150203T090000-20150203T100000">09:00:00 CET</label>
paul@243 1218
        <span class="endpoint">10:00:00 CET</span>
paul@243 1219
        """
paul@243 1220
paul@201 1221
        page = self.page
paul@244 1222
        tzid = self.get_tzid()
paul@243 1223
        daystr = format_datetime(point.date())
paul@201 1224
        value, identifier = self._slot_value_and_identifier(point, endpoint)
paul@238 1225
        slots = self.env.get_args().get("slot", [])
paul@239 1226
        self._slot_selector(value, identifier, slots)
paul@243 1227
        page.label(self.format_time(point, "long"), class_="timepoint day-%s" % daystr, for_=identifier)
paul@244 1228
        page.span(self.format_time(endpoint or get_end_of_day(point, tzid), "long"), class_="endpoint")
paul@239 1229
paul@239 1230
    def _slot_selector(self, value, identifier, slots):
paul@258 1231
        reset = self.env.get_args().has_key("reset")
paul@239 1232
        page = self.page
paul@258 1233
        if not reset and value in slots:
paul@249 1234
            page.input(name="slot", type="checkbox", value=value, id=identifier, class_="newevent selector", checked="checked")
paul@202 1235
        else:
paul@249 1236
            page.input(name="slot", type="checkbox", value=value, id=identifier, class_="newevent selector")
paul@201 1237
paul@201 1238
    def _empty_slot(self, point, endpoint):
paul@197 1239
        page = self.page
paul@201 1240
        value, identifier = self._slot_value_and_identifier(point, endpoint)
paul@236 1241
        page.label("Select/deselect period", class_="newevent popup", for_=identifier)
paul@196 1242
paul@239 1243
    def _day_value_and_identifier(self, day):
paul@239 1244
        value = "%s-" % format_datetime(day)
paul@239 1245
        identifier = "day-%s" % value
paul@239 1246
        return value, identifier
paul@239 1247
paul@201 1248
    def _slot_value_and_identifier(self, point, endpoint):
paul@202 1249
        value = "%s-%s" % (format_datetime(point), endpoint and format_datetime(endpoint) or "")
paul@201 1250
        identifier = "slot-%s" % value
paul@201 1251
        return value, identifier
paul@196 1252
paul@257 1253
    def _show_menu(self, name, value, items):
paul@257 1254
        page = self.page
paul@257 1255
        values = self.env.get_args().get(name, [value])
paul@257 1256
        page.select(name=name)
paul@257 1257
        for v, label in items:
paul@257 1258
            if v in values:
paul@257 1259
                page.option(label, value=v, selected="selected")
paul@257 1260
            else:
paul@257 1261
                page.option(label, value=v)
paul@257 1262
        page.select.close()
paul@257 1263
paul@246 1264
    # Incoming HTTP request direction.
paul@246 1265
paul@69 1266
    def select_action(self):
paul@69 1267
paul@69 1268
        "Select the desired action and show the result."
paul@69 1269
paul@121 1270
        path_info = self.env.get_path_info().strip("/")
paul@121 1271
paul@69 1272
        if not path_info:
paul@114 1273
            self.show_calendar()
paul@121 1274
        elif self.show_object(path_info):
paul@70 1275
            pass
paul@70 1276
        else:
paul@70 1277
            self.no_page()
paul@69 1278
paul@82 1279
    def __call__(self):
paul@69 1280
paul@69 1281
        "Interpret a request and show an appropriate response."
paul@69 1282
paul@69 1283
        if not self.user:
paul@69 1284
            self.no_user()
paul@69 1285
        else:
paul@69 1286
            self.select_action()
paul@69 1287
paul@70 1288
        # Write the headers and actual content.
paul@70 1289
paul@69 1290
        print >>self.out, "Content-Type: text/html; charset=%s" % self.encoding
paul@69 1291
        print >>self.out
paul@69 1292
        self.out.write(unicode(self.page).encode(self.encoding))
paul@69 1293
paul@69 1294
if __name__ == "__main__":
paul@128 1295
    Manager()()
paul@69 1296
paul@69 1297
# vim: tabstop=4 expandtab shiftwidth=4