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ivle/makeuser.py
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import logging
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import subprocess
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from storm.expr import Select, Max
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import ivle.config
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from ivle.database import (User, ProjectGroup, Assessed, ProjectSubmission,
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        Project, ProjectSet, Offering, Enrolment, Subject, Semester)
 
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from ivle.database import ProjectGroup, User
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def chown_to_webserver(filename):
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    """chown a directory and its contents to the web server.
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%(login)s = rw
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""" % {'login': u.login})
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    # Now we need to grant offering tutors and lecturers access to the latest
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    # submissions in their offerings. There are much prettier ways to do this,
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    # but a lot of browser requests call this function, so it needs to be
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    # fast. We can grab all of the paths needing authorisation directives with
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    # a single query, and we cache the list of viewers for each offering.
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    offering_viewers_cache = {}
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    for (login, psid, pspath, offeringid) in store.find(
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        (User.login, ProjectSubmission.id, ProjectSubmission.path,
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         Offering.id),
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            Assessed.id == ProjectSubmission.assessed_id,
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            User.id == Assessed.user_id,
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            Project.id == Assessed.project_id,
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            ProjectSet.id == Project.project_set_id,
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            Offering.id == ProjectSet.id,
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            ProjectSubmission.date_submitted == Select(
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                    Max(ProjectSubmission.date_submitted),
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                    ProjectSubmission.assessed_id == Assessed.id,
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                    tables=ProjectSubmission
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            )
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        ):
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        # Do we already have the list of logins authorised for this offering
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        # cached? If not, get it.
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        if offeringid not in offering_viewers_cache:
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            offering_viewers_cache[offeringid] = list(store.find(
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                    User.login,
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                    User.id == Enrolment.user_id,
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                    Enrolment.offering_id == offeringid,
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                    Enrolment.role.is_in((u'tutor', u'lecturer'))
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                )
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            )
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        f.write("""
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# Submission %(id)d
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[%(login)s:%(path)s]
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""" % {'login': login, 'id': psid, 'path': pspath})
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        for viewer_login in offering_viewers_cache[offeringid]:
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            # We don't want to override the owner's write privilege,
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            # so we don't add them to the read-only ACL.
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            if login != viewer_login:
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                f.write("%s = r\n" % viewer_login)
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    f.close()
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    os.rename(temp_name, conf_name)
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    chown_to_webserver(conf_name)
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""" % {'time': time.asctime()})
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    group_members_cache = {}
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    for group in store.find(ProjectGroup):
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        offering = group.project_set.offering
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        reponame = "_".join([offering.subject.short_name,
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                             group.name])
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        f.write("[%s:/]\n" % reponame)
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        if group.id not in group_members_cache:
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            group_members_cache[group.id] = set()
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        for user in group.members:
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            group_members_cache[group.id].add(user.login)
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            f.write("%s = rw\n" % user.login)
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        f.write("\n")
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    # Now we need to grant offering tutors and lecturers access to the latest
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    # submissions in their offerings. There are much prettier ways to do this,
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    # but a lot of browser requests call this function, so it needs to be
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    # fast. We can grab all of the paths needing authorisation directives with
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    # a single query, and we cache the list of viewers for each offering.
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    offering_viewers_cache = {}
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    for (ssn, year, sem, name, psid, pspath, gid, offeringid) in store.find(
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        (Subject.short_name, Semester.year, Semester.semester,
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         ProjectGroup.name, ProjectSubmission.id, ProjectSubmission.path,
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         ProjectGroup.id, Offering.id),
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            Assessed.id == ProjectSubmission.assessed_id,
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            ProjectGroup.id == Assessed.project_group_id,
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            Project.id == Assessed.project_id,
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            ProjectSet.id == Project.project_set_id,
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            Offering.id == ProjectSet.offering_id,
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            Subject.id == Offering.subject_id,
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            Semester.id == Offering.semester_id,
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            ProjectSubmission.date_submitted == Select(
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                    Max(ProjectSubmission.date_submitted),
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                    ProjectSubmission.assessed_id == Assessed.id,
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                    tables=ProjectSubmission
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            )
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        ):
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        reponame = "_".join([ssn, year, sem, name])
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        # Do we already have the list of logins authorised for this offering
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        # cached? If not, get it.
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        if offeringid not in offering_viewers_cache:
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            offering_viewers_cache[offeringid] = list(store.find(
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                    User.login,
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                    User.id == Enrolment.user_id,
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                    Enrolment.offering_id == offeringid,
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                    Enrolment.role.is_in((u'tutor', u'lecturer'))
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                )
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            )
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        f.write("""
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# Submission %(id)d
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[%(repo)s:%(path)s]
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""" % {'repo': reponame, 'id': psid, 'path': pspath})
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        for viewer_login in offering_viewers_cache[offeringid]:
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            # Skip existing group members, or they can't write to it any more.
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            if viewer_login not in group_members_cache[gid]:
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                f.write("%s = r\n" % viewer_login)
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    f.close()
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    os.rename(temp_name, conf_name)
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    chown_to_webserver(conf_name)