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re2o/search/engine.py
Laouen Fernet 3ec05c68e5 Add some docstrings in search/
2020-06-01 18:21:20 +02:00

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# Re2o est un logiciel d'administration développé initiallement au rezometz. Il
# se veut agnostique au réseau considéré, de manière à être installable en
# quelques clics.
#
# Copyright © 2017 Gabriel Détraz
# Copyright © 2017 Lara Kermarec
# Copyright © 2017 Augustin Lemesle
# Copyright © 2019 Jean-Romain Garnier
#
# 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""The views for the search app, responsible for finding the matches
Augustin lemesle, Gabriel Détraz, Lara Kermarec, Maël Kervella,
Jean-Romain Garnier
Gplv2"""
from __future__ import unicode_literals
from netaddr import EUI, AddrFormatError
from django.db.models import Q
from django.db.models import Value
from django.db.models.functions import Concat
from users.models import User, Adherent, Club, Ban, Whitelist
from machines.models import Machine
from topologie.models import Port, Switch, Room
from cotisations.models import Facture
from preferences.models import GeneralOption
from re2o.base import SortTable, re2o_paginator
class Query:
"""Class representing a query.
It can contain the user-entered text, the operator for the query,
and a list of subqueries.
Attributes:
text: the string written by the user in a query.
operator: character used to link subqueries, e.g. "+".
subqueries: list of Query objects when the current query is split in
several parts.
"""
def __init__(self, text="", case_sensitive=False):
"""Initialise an instance of Query.
Args:
text: the content of the query (default: "").
case_sensitive: bool, True if the query is case sensitive and
False if not (default: False).
"""
self.text = text
self.operator = None
self.subqueries = None
self.case_sensitive = case_sensitive
def add_char(self, char):
"""Add the given character to the query's text.
Args:
char: the character to be added.
"""
self.text += char
def add_operator(self, operator):
"""Consider a new operator was entered, and that it must be processed.
The query's current text is moved to self.subqueries in the form
of a plain Query object.
Args:
operator: the operator to be added.
"""
self.operator = operator
if self.subqueries is None:
self.subqueries = []
self.subqueries.append(Query(self.text, self.case_sensitive))
self.text = ""
self.case_sensitive = False
@property
def plaintext(self):
"""Return the textual representation of the query's content."""
if self.operator is not None:
return self.operator.join([q.plaintext for q in self.subqueries])
if self.case_sensitive:
return "\"{}\"".format(self.text)
return self.text
def filter_fields():
"""Return the list of fields the search applies to."""
return ["users",
"clubs",
"machines",
"factures",
"bans",
"whitelists",
"rooms",
"ports",
"switches"]
def empty_filters():
"""Build empty filters used by Django."""
return {f: Q() for f in filter_fields()}
def is_int(variable):
"""Check if the variable can be cast to an integer."""
try:
int(variable)
except ValueError:
return False
else:
return True
def finish_results(request, results, col, order):
"""Sort the results by applying filters and then limit them to the
number of max results. Finally add the info of the maximum number of
results to the dictionary.
Args:
request: django request, corresponding to the search.
results: dict, the results of the search.
col: the column used to sort the results.
order: the order used to sort the results.
Returns:
The dictionary of results sorted and paginated.
"""
results["users"] = SortTable.sort(
results["users"], col, order, SortTable.USERS_INDEX
)
results["clubs"] = SortTable.sort(
results["clubs"], col, order, SortTable.USERS_INDEX
)
results["machines"] = SortTable.sort(
results["machines"], col, order, SortTable.MACHINES_INDEX
)
results["factures"] = SortTable.sort(
results["factures"], col, order, SortTable.COTISATIONS_INDEX
)
results["bans"] = SortTable.sort(
results["bans"], col, order, SortTable.USERS_INDEX_BAN
)
results["whitelists"] = SortTable.sort(
results["whitelists"], col, order, SortTable.USERS_INDEX_WHITE
)
results["rooms"] = SortTable.sort(
results["rooms"], col, order, SortTable.TOPOLOGIE_INDEX_ROOM
)
results["ports"] = SortTable.sort(
results["ports"], col, order, SortTable.TOPOLOGIE_INDEX_PORT
)
results["switches"] = SortTable.sort(
results["switches"], col, order, SortTable.TOPOLOGIE_INDEX
)
max_result = GeneralOption.get_cached_value("search_display_page")
for name, val in results.items():
page_arg = name + "_page"
results[name] = re2o_paginator(request,
val.distinct(),
max_result,
page_arg=page_arg)
results.update({"max_result": max_result})
return results
def contains_filter(attribute, word, case_sensitive=False):
"""Create a django model filtering whether the given attribute
contains the specified value.
Args:
attribute: the attribute used to check if it contains the given word or
not.
word: the word used to check if it is contained in the attribute or
not.
case_sensitive: bool, True if the check is case sensitive and
False if not (default: False).
"""
if case_sensitive:
attr = "{}__{}".format(attribute, "contains")
else:
attr = "{}__{}".format(attribute, "icontains")
return Q(**{attr: word})
def search_single_word(word, filters, user, start, end,
user_state, email_state, aff,
case_sensitive=False):
"""Construct the correct filters to match differents fields of some models
with the given query according to the given filters.
The match fields are either CharField or IntegerField that will be displayed
on the results page (else, one might not see why a result has matched the
query). IntegerField are matched against the query only if it can be casted
to an int.
"""
# Users
if "0" in aff:
filter_clubs = (
contains_filter("surname", word, case_sensitive)
| contains_filter("pseudo", word, case_sensitive)
| contains_filter("email", word, case_sensitive)
| contains_filter("telephone", word, case_sensitive)
# Added through annotate
| contains_filter("room_full_name", word, case_sensitive)
| contains_filter("room_full_name_stuck", word, case_sensitive)
)
# Users have a name whereas clubs only have a surname
filter_users = (
filter_clubs
| contains_filter("name", word, case_sensitive)
)
if not User.can_view_all(user)[0]:
filter_clubs &= Q(id=user.id)
filter_users &= Q(id=user.id)
filter_clubs &= Q(state__in=user_state)
filter_users &= Q(state__in=user_state)
filter_clubs &= Q(email_state__in=email_state)
filter_users &= Q(email_state__in=email_state)
filters["users"] |= filter_users
filters["clubs"] |= filter_clubs
# Machines
if "1" in aff:
filter_machines = (
contains_filter("name", word, case_sensitive)
| (contains_filter("user__pseudo", word, case_sensitive)
& Q(user__state__in=user_state)
& Q(user__email_state__in=email_state))
| contains_filter("interface__domain__name", word, case_sensitive)
| contains_filter("interface__domain__related_domain__name",
word, case_sensitive)
| contains_filter("interface__mac_address", word, case_sensitive)
| contains_filter("interface__ipv4__ipv4", word, case_sensitive)
)
try:
_ = EUI(word, 48)
filter_machines |= Q(interface__mac_address=word)
except AddrFormatError:
pass
if not Machine.can_view_all(user)[0]:
filter_machines &= Q(user__id=user.id)
filters["machines"] |= filter_machines
# Factures
if "2" in aff:
filter_factures = (
contains_filter("user__pseudo", word, case_sensitive)
& Q(user__state__in=user_state)
& Q(user__email_state__in=email_state)
)
if start is not None:
filter_factures &= Q(date__gte=start)
if end is not None:
filter_factures &= Q(date__lte=end)
filters["factures"] |= filter_factures
# Bans
if "3" in aff:
filter_bans = (
contains_filter("user__pseudo", word, case_sensitive)
& Q(user__state__in=user_state)
& Q(user__email_state__in=email_state)
) | contains_filter("raison", word, case_sensitive)
if start is not None:
filter_bans &= (
(Q(date_start__gte=start) & Q(date_end__gte=start))
| (Q(date_start__lte=start) & Q(date_end__gte=start))
| (Q(date_start__gte=start) & Q(date_end__lte=start))
)
if end is not None:
filter_bans &= (
(Q(date_start__lte=end) & Q(date_end__lte=end))
| (Q(date_start__lte=end) & Q(date_end__gte=end))
| (Q(date_start__gte=end) & Q(date_end__lte=end))
)
filters["bans"] |= filter_bans
# Whitelists
if "4" in aff:
filter_whitelists = (
contains_filter("user__pseudo", word, case_sensitive)
& Q(user__state__in=user_state)
& Q(user__email_state__in=email_state)
) | contains_filter("raison", word, case_sensitive)
if start is not None:
filter_whitelists &= (
(Q(date_start__gte=start) & Q(date_end__gte=start))
| (Q(date_start__lte=start) & Q(date_end__gte=start))
| (Q(date_start__gte=start) & Q(date_end__lte=start))
)
if end is not None:
filter_whitelists &= (
(Q(date_start__lte=end) & Q(date_end__lte=end))
| (Q(date_start__lte=end) & Q(date_end__gte=end))
| (Q(date_start__gte=end) & Q(date_end__lte=end))
)
filters["whitelists"] |= filter_whitelists
# Rooms
if "5" in aff and Room.can_view_all(user):
filter_rooms = (
contains_filter("details", word, case_sensitive)
# Added through annotate
| contains_filter("full_name", word, case_sensitive)
| contains_filter("full_name_stuck", word, case_sensitive)
| Q(port__details=word)
)
filters["rooms"] |= filter_rooms
# Switch ports
if "6" in aff and User.can_view_all(user):
filter_ports = (
contains_filter("machine_interface__domain__name",
word, case_sensitive)
| contains_filter("related__switch__interface__domain__name",
word, case_sensitive)
| contains_filter("custom_profile__name", word, case_sensitive)
| contains_filter("custom_profile__profil_default",
word, case_sensitive)
| contains_filter("details", word, case_sensitive)
# Added through annotate
| contains_filter("room_full_name", word, case_sensitive)
| contains_filter("room_full_name_stuck", word, case_sensitive)
)
if is_int(word):
filter_ports |= Q(port=word)
filters["ports"] |= filter_ports
# Switches
if "7" in aff and Switch.can_view_all(user):
filter_switches = (
contains_filter("interface__domain__name", word, case_sensitive)
| contains_filter("interface__ipv4__ipv4", word, case_sensitive)
| contains_filter("switchbay__building__name",
word, case_sensitive)
| contains_filter("stack__name", word, case_sensitive)
| contains_filter("model__reference", word, case_sensitive)
| contains_filter("model__constructor__name", word, case_sensitive)
| contains_filter("interface__details", word, case_sensitive)
)
if is_int(word):
filter_switches |= Q(number=word) | Q(stack_member_id=word)
filters["switches"] |= filter_switches
return filters
def apply_filters(filters, user, aff):
"""Apply the filters constructed by search_single_query.
It also takes into account the visual filters defined during
the search query.
"""
# Results are later filled-in depending on the display filter
# In some cases, annotations are used to match what is displayed in the
# results. For example, the displayed room is actually
# "room__building__name room__name", so queries wouldn't match what the
# user expects if we just kept the database's format
results = {
"users": Adherent.objects.none(),
"clubs": Club.objects.none(),
"machines": Machine.objects.none(),
"factures": Facture.objects.none(),
"bans": Ban.objects.none(),
"whitelists": Whitelist.objects.none(),
"rooms": Room.objects.none(),
"ports": Port.objects.none(),
"switches": Switch.objects.none(),
}
# Users and clubs
if "0" in aff:
results["users"] = Adherent.objects.annotate(
room_full_name=Concat("room__building__name",
Value(" "), "room__name"),
room_full_name_stuck=Concat("room__building__name", "room__name"),
).filter(filters["users"])
results["clubs"] = Club.objects.annotate(
room_full_name=Concat("room__building__name",
Value(" "), "room__name"),
room_full_name_stuck=Concat("room__building__name", "room__name"),
).filter(filters["clubs"])
# Machines
if "1" in aff:
results["machines"] = Machine.objects.filter(filters["machines"])
# Factures
if "2" in aff:
results["factures"] = Facture.objects.filter(filters["factures"])
# Bans
if "3" in aff:
results["bans"] = Ban.objects.filter(filters["bans"])
# Whitelists
if "4" in aff:
results["whitelists"] = Whitelist.objects.filter(filters["whitelists"])
# Rooms
if "5" in aff and Room.can_view_all(user):
results["rooms"] = Room.objects.annotate(
full_name=Concat("building__name", Value(" "), "name"),
full_name_stuck=Concat("building__name", "name"),
).filter(filters["rooms"])
# Switch ports
if "6" in aff and User.can_view_all(user):
results["ports"] = Port.objects.annotate(
room_full_name=Concat("room__building__name",
Value(" "), "room__name"),
room_full_name_stuck=Concat("room__building__name", "room__name"),
).filter(filters["ports"])
# Switches
if "7" in aff and Switch.can_view_all(user):
results["switches"] = Switch.objects.filter(filters["switches"])
return results
def search_single_query(query, filters, user, start, end, user_state, email_state, aff):
"""Handle different queries an construct the correct filters using
search_single_word."""
if query.operator == "+":
# Special queries with "+" operators should use & rather than |
newfilters = empty_filters()
for q in query.subqueries:
# Construct an independent filter for each subquery
subfilters = search_single_query(q, empty_filters(), user,
start, end, user_state,
email_state, aff)
# Apply the subfilter
for field in filter_fields():
newfilters[field] &= subfilters[field]
# Add these filters to the existing ones
for field in filter_fields():
filters[field] |= newfilters[field]
return filters
# Handle standard queries
return search_single_word(query.text, filters, user, start, end,
user_state, email_state, aff,
query.case_sensitive)
def create_queries(query):
"""Function used to split the query in different words to look for.
The rules are the following :
- anti-slash ('\\') is used to escape characters
- anything between quotation marks ('"') is kept intact (not
interpreted as separators) excepts anti-slashes used to escape
Values in between quotation marks are not searched accross
multiple field in the database (contrary to +)
- spaces (' ') and commas (',') are used to separated words
- "+" signs are used as "and" operators
"""
# A dict representing the different queries extracted from the user's text
queries = []
current_query = None
# Whether the query is between "
keep_intact = False
# Whether the previous char was a \
escaping_char = False
for char in query:
if current_query is None:
# We are starting a new word
current_query = Query()
if escaping_char:
# The last char war a \ so we escape this char
escaping_char = False
current_query.add_char(char)
continue
if char == "\\":
# We need to escape the next char
escaping_char = True
continue
if char == '"':
# Toogle the keep_intact state, if true, we are between two "
keep_intact = not keep_intact
if keep_intact:
current_query.case_sensitive = True
continue
if keep_intact:
# If we are between two ", ignore separators
current_query.add_char(char)
continue
if char == "+":
if len(current_query.text) == 0:
# Can't sart a query with a "+", consider it escaped
current_query.add_char(char)
continue
current_query.add_operator("+")
continue
if char == " " or char == ",":
# If we encouter a separator outside of ", we create a new word
if len(current_query.text) == 0:
# Discard empty queries
continue
if current_query.operator is not None:
# If we were building a special structure, finish building it
current_query.add_operator(current_query.operator)
# Save the query and start a new one
queries.append(current_query)
current_query = None
continue
# If we haven't encountered any special case, add the char to the word
current_query.add_char(char)
# Save the current working query if necessary
if current_query is not None:
if current_query.operator is not None:
# There was an operator supposed to split multiple words
if len(current_query.text) > 0:
# Finish the current search
current_query.add_operator(current_query.operator)
queries.append(current_query)
return queries
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