~azzar1/unity/add-show-desktop-key : contents of ivle/webapp/userservice/__init_

~azzar1/unity/add-show-desktop-key : (revision 1796)
# IVLE
# Copyright (C) 2007-2008 The University of Melbourne
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

# App: userservice
# Author: Matt Giuca
# Date: 14/2/2008

# Provides an Ajax service for handling user management requests.
# This includes when a user logs in for the first time.

### Actions ###

# The one-and-only path segment to userservice determines the action being
# undertaken.
# All actions require that you are logged in.
# All actions require method = POST, unless otherwise stated.

# userservice/activate_me
# Required cap: None
# declaration = "I accept the IVLE Terms of Service"
# Activate the currently-logged-in user's account. Requires that "declaration"
# is as above, and that the user's state is "no_agreement".

# TODO
# userservice/enable_user
# Required cap: CAP_UPDATEUSER
# Enable a user whose account has been disabled. Does not work for
# no_agreement or pending users.
# login = Login name of user to enable.

# TODO
# userservice/disable_user
# Required cap: CAP_UPDATEUSER
# Disable a user's account. Does not work for no_agreement or pending users.
# login = Login name of user to disable.

# userservice/get_enrolments
# Required cap: None (for yourself)
# Returns a JSON encoded listing of a students is enrollments

# PROJECTS AND GROUPS

# userservice/get_project_groups
# Required cap: None
# Returns all the project groups in an offering grouped by project set
# Required:
#   offeringid

# userservice/create_project_set
# Required cap: CAP_MANAGEPROJECTS
# Creates a project set for a offering
# Required:
#   offeringid, max_students_per_group
# Returns:
#   projectsetid

# userservice/create_project
# Required cap: CAP_MANAGEPROJECTS
# Creates a project in a specific project set
# Required:
#   projectsetid
# Optional:
#   synopsis, url, deadline
# Returns:
#   projectid

# userservice/create_group
# Required cap: CAP_MANAGEGROUPS
# Creates a project group in a specific project set
# Required:
#   projectsetid, groupnm
# Optional:
#   nick

# userservice/get_group_membership
# Required cap: None
# Returns two lists. One of people in the group and one of people not in the 
# group (but enroled in the offering)
# Required:
#   groupid

# userservice/assign_to_group
# Required cap: CAP_MANAGEGROUPS
# Assigns a user to a project group
# Required: login, groupid

import os
import sys
import datetime

import cjson

import ivle.database
from ivle import (util, chat)
from ivle.webapp.security import get_user_details
import ivle.pulldown_subj

from ivle.rpc.decorators import require_method, require_admin

from ivle.auth import AuthError, authenticate
import urllib

from ivle.webapp.base.forms import VALID_URL_NAME
from ivle.webapp.base.views import BaseView
from ivle.webapp.base.plugins import ViewPlugin
from ivle.webapp.errors import NotFound, BadRequest, Unauthorized
from ivle.webapp import ApplicationRoot

# The user must send this declaration message to ensure they acknowledge the
# TOS
USER_DECLARATION = "I accept the IVLE Terms of Service"

class UserServiceView(BaseView):
    subpath_allowed = True

    def authorize(self, req):
        # XXX: activate_me isn't called by a valid user, so is special for now.
        if req.path == 'activate_me' and get_user_details(req) is not None:
            return True
        return req.user is not None

    def render(self, req):
        # The path determines which "command" we are receiving
        fields = req.get_fieldstorage()
        try:
            func = actions_map[self.path]
        except KeyError:
            raise NotFound()
        func(req, fields)

    @property
    def path(self):
        return os.path.join(*self.subpath) if self.subpath else ''


class Plugin(ViewPlugin):
    views = [(ApplicationRoot, 'userservice', UserServiceView)]

@require_method('POST')
def handle_activate_me(req, fields):
    """Create the jail, svn, etc, for the currently logged in user (this is
    put in the queue for usermgt to do).
    This will block until usermgt returns, which could take seconds to minutes
    in the extreme. Therefore, it is designed to be called by Ajax, with a
    nice "Please wait" message on the frontend.

    This will signal that the user has accepted the terms of the license
    agreement, and will result in the user's database status being set to
    "enabled". (Note that it will be set to "pending" for the duration of the
    handling).

    As such, it takes a single POST field, "declaration", which
    must have the value, "I accept the IVLE Terms of Service".
    (Otherwise users could navigate to /userservice/createme without
    "accepting" the terms - at least this way requires them to acknowledge
    their acceptance). It must only be called through a POST request.
    """

    user = get_user_details(req)

    try:
        declaration = fields.getfirst('declaration')
    except AttributeError:
        declaration = None      # Will fail next test
    if declaration != USER_DECLARATION:
        raise BadRequest()

    # Make sure the user's status is "no_agreement", and set status to
    # pending, within the one transaction. This ensures we only do this
    # one time.
    try:
        # Check that the user's status is "no_agreement".
        # (Both to avoid redundant calls, and to stop disabled users from
        # re-enabling their accounts).
        if user.state != "no_agreement":
            raise BadRequest("You have already agreed to the terms.")
        # Write state "pending" to ensure we don't try this again
        user.state = u"pending"
    except:
        req.store.rollback()
        raise
    req.store.commit()

    # Get the arguments for usermgt.activate_user from the session
    # (The user must have already logged in to use this app)
    args = {
        "login": user.login,
    }
    msg = {'activate_user': args}

    # Release our lock on the db so usrmgt can write
    req.store.rollback()

    # Try and contact the usrmgt server
    try:
        response = chat.chat(req.config['usrmgt']['host'],
                             req.config['usrmgt']['port'],
                             msg,
                             req.config['usrmgt']['magic'],
                            )
    except cjson.DecodeError:
        # Gave back rubbish - set the response to failure
        response = {'response': 'usrmgt-failure'}

    # Get the staus of the users request
    try:
        status = response['response']
    except KeyError:
        status = 'failure'

    if status == 'okay':
        user.state = u"enabled"
    else:
        # Reset the user back to no agreement
        user.state = u"no_agreement"

    # Write the response
    req.content_type = "text/plain"
    req.write(cjson.encode(response))

def handle_get_enrolments(req, fields):
    """
    Retrieve a user's enrolment details. Each enrolment includes any group
    memberships for that offering.
    """
    # For the moment we're only able to query ourselves
    fullpowers = False

    try:
        user = ivle.database.User.get_by_login(req.store,
                    fields.getfirst('login'))
        if user is None:
            raise AttributeError()
        if not fullpowers and user != req.user:
            raise Unauthorized()
    except AttributeError:
        # If login not specified, update yourself
        user = req.user

    dict_enrolments = []
    for e in user.active_enrolments:
        dict_enrolments.append({
            'offeringid':      e.offering.id,
            'url':             req.publisher.generate(e.offering),
            'subj_code':       e.offering.subject.code,
            'subj_name':       e.offering.subject.name,
            'subj_short_name': e.offering.subject.short_name,
            'year':            e.offering.semester.year,
            'semester':        e.offering.semester.semester,
            'state':           e.offering.semester.state,
            'groups':          [{'name': group.name,
                                 'nick': group.nick} for group in e.groups]
        })
    response = cjson.encode(dict_enrolments)
    req.content_type = "text/plain"
    req.write(response)

def handle_get_project_groups(req, fields):
    """Required cap: None
    Returns all the project groups in an offering grouped by project set
    Required:
        offeringid
    """

    offeringid = fields.getfirst('offeringid')
    if offeringid is None:
        raise BadRequest("Required: offeringid")
    try:
        offeringid = int(offeringid)
    except:
        raise BadRequest("offeringid must be an integer")

    offering = req.store.get(ivle.database.Offering, offeringid)

    if 'admin_groups' not in offering.get_permissions(req.user, req.config):
        raise Unauthorized()

    dict_projectsets = []
    for p in offering.project_sets:
        dict_projectsets.append({
            'projectsetid': p.id,
            'max_students_per_group': p.max_students_per_group,
            'groups': [{'groupid': g.id,
                        'groupnm': g.name,
                        'nick': g.nick} for g in p.project_groups]
        })

    response = cjson.encode(dict_projectsets)
    req.write(response)

@require_method('POST')
def handle_create_group(req, fields):
    """Required cap: CAP_MANAGEGROUPS
    Creates a project group in a specific project set
    Required:
        projectsetid, groupnm
    Optional:
        nick
    Returns:
        groupid
    """
    # Get required fields
    projectsetid = fields.getfirst('projectsetid').value
    groupnm = fields.getfirst('groupnm').value

    if projectsetid is None or groupnm is None:
        raise BadRequest("Required: projectsetid, groupnm")
    groupnm = unicode(groupnm)
    try:
        projectsetid = int(projectsetid)
    except:
        raise BadRequest("projectsetid must be an integer")

    if not VALID_URL_NAME.match(groupnm):
        raise BadRequest(
            "Group names must consist of a lowercase alphanumeric character "
            "followed by any number of lowercase alphanumerics, ., +, - or _.")

    projectset = req.store.get(ivle.database.ProjectSet, projectsetid)
    if projectset is None:
        raise BadRequest("Invalid projectsetid")
    if not projectset.is_group:
        raise BadRequest("Not a group project set")
    if 'admin_groups' not in projectset.offering.get_permissions(
        req.user, req.config):
        raise Unauthorized()

    # Get optional fields
    nick = fields.getfirst('nick').value
    if nick is not None:
        nick = unicode(nick)

    group = ivle.database.ProjectGroup(name=groupnm,
                                       project_set=projectset,
                                       nick=nick,
                                       created_by=req.user,
                                       epoch=datetime.datetime.now())
    req.store.add(group)

    # Create the group repository
    # Yes, this is ugly, and it would be nice to just pass in the groupid,
    # but the object isn't visible to the extra transaction in
    # usrmgt-server until we commit, which we only do once the repo is
    # created.
    offering = group.project_set.offering

    args = {
        "subj_short_name": offering.subject.short_name,
        "year": offering.semester.year,
        "semester": offering.semester.semester,
        "groupnm": group.name,
    }
    msg = {'create_group_repository': args}

    # Contact the usrmgt server
    try:
        usrmgt = chat.chat(req.config['usrmgt']['host'],
                           req.config['usrmgt']['port'],
                           msg,
                           req.config['usrmgt']['magic'],
                          )
    except cjson.DecodeError, e:
        raise Exception("Could not understand usrmgt server response:" +
                        e.message)

    if 'response' not in usrmgt or usrmgt['response']=='failure':
        raise Exception("Failure creating repository: " + str(usrmgt))

    req.content_type = "text/plain"
    req.write('')

def handle_get_group_membership(req, fields):
    """ Required cap: None
    Returns two lists. One of people in the group and one of people not in the 
    group (but enroled in the offering)
    Required:
        groupid, offeringid
    """
    # Get required fields
    groupid = fields.getfirst('groupid')
    offeringid = fields.getfirst('offeringid')
    if groupid is None or offeringid is None:
        raise BadRequest("Required: groupid, offeringid")
    try:
        groupid = int(groupid)
    except:
        raise BadRequest("groupid must be an integer")
    group = req.store.get(ivle.database.ProjectGroup, groupid)

    try:
        offeringid = int(offeringid)
    except:
        raise BadRequest("offeringid must be an integer")
    offering = req.store.get(ivle.database.Offering, offeringid)

    if 'admin_groups' not in offering.get_permissions(req.user, req.config):
        raise Unauthorized()

    offeringmembers = [{'login': user.login,
                        'fullname': user.fullname
                       } for user in offering.members.order_by(
                            ivle.database.User.login)
                      ]
    groupmembers = [{'login': user.login,
                        'fullname': user.fullname
                       } for user in group.members.order_by(
                            ivle.database.User.login)
                      ]

    # Make sure we don't include members in both lists
    for member in groupmembers:
        if member in offeringmembers:
            offeringmembers.remove(member)

    response = cjson.encode(
        {'groupmembers': groupmembers, 'available': offeringmembers})

    req.content_type = "text/plain"
    req.write(response)

@require_method('POST')
def handle_assign_group(req, fields):
    """ Required cap: CAP_MANAGEGROUPS
    Assigns a user to a project group
    Required:
        login, groupid
    """
    # Get required fields
    login = fields.getfirst('login')
    groupid = fields.getfirst('groupid')
    if login is None or groupid is None:
        raise BadRequest("Required: login, groupid")

    group = req.store.get(ivle.database.ProjectGroup, int(groupid))
    user = ivle.database.User.get_by_login(req.store, login)

    if 'admin_groups' not in group.project_set.offering.get_permissions(
        req.user, req.config):
        raise Unauthorized()

    # Add membership to database
    # We can't keep a transaction open until the end here, as usrmgt-server
    # needs to see the changes!
    group.members.add(user)
    req.store.commit()

    # Rebuild the svn config file
    # Contact the usrmgt server
    msg = {'rebuild_svn_group_config': {}}
    try:
        usrmgt = chat.chat(req.config['usrmgt']['host'],
                           req.config['usrmgt']['port'],
                           msg,
                           req.config['usrmgt']['magic'],
                          )
    except cjson.DecodeError, e:
        raise Exception("Could not understand usrmgt server response: %s" +
                        e.message)

        if 'response' not in usrmgt or usrmgt['response']=='failure':
            raise Exception("Failure creating repository: " + str(usrmgt))

    return(cjson.encode({'response': 'okay'}))

@require_method('POST')
def handle_unassign_group(req, fields):
    """Remove a user from a project group.

    The user is removed from the group in the database, and access to the
    group Subversion repository is revoked.

    Note that any checkouts will remain, although they will be unusable.
    """

    # Get required fields
    login = fields.getfirst('login')
    groupid = fields.getfirst('groupid')
    if login is None or groupid is None:
        raise BadRequest("Required: login, groupid")

    group = req.store.get(ivle.database.ProjectGroup, int(groupid))
    user = ivle.database.User.get_by_login(req.store, login)

    if 'admin_groups' not in group.project_set.offering.get_permissions(
        req.user, req.config):
        raise Unauthorized()

    # Remove membership from the database
    # We can't keep a transaction open until the end here, as usrmgt-server
    # needs to see the changes!
    group.members.remove(user)
    req.store.commit()

    # Rebuild the svn config file
    # Contact the usrmgt server
    msg = {'rebuild_svn_group_config': {}}
    try:
        usrmgt = chat.chat(req.config['usrmgt']['host'],
                           req.config['usrmgt']['port'],
                           msg,
                           req.config['usrmgt']['magic'],
                          )
    except cjson.DecodeError, e:
        raise Exception("Could not understand usrmgt server response: %s" +
                        e.message)

        if 'response' not in usrmgt or usrmgt['response']=='failure':
            raise Exception("Failure creating repository: " + str(usrmgt))

    return(cjson.encode({'response': 'okay'}))

# Map action names (from the path)
# to actual function objects
actions_map = {
    "activate_me": handle_activate_me,
    "get_enrolments": handle_get_enrolments,
    "get_project_groups": handle_get_project_groups,
    "get_group_membership": handle_get_group_membership,
    "create_group": handle_create_group,
    "assign_group": handle_assign_group,
    "unassign_group": handle_unassign_group,
}