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136 lines
5.0 KiB
Python
136 lines
5.0 KiB
Python
from typing import List, Pattern
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import re2
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import uri_template
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from django.core.exceptions import ValidationError
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from django.db import models
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from django.db.models import CASCADE
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from django.db.models.signals import post_delete, post_save
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from django.utils.translation import gettext as _
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from typing_extensions import override
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from zerver.lib import cache
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from zerver.lib.cache import cache_delete, cache_with_key
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from zerver.lib.per_request_cache import (
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flush_per_request_cache,
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return_same_value_during_entire_request,
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)
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from zerver.lib.types import LinkifierDict
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from zerver.models.realms import Realm
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def filter_pattern_validator(value: str) -> Pattern[str]:
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try:
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# Do not write errors to stderr (this still raises exceptions)
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options = re2.Options()
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options.log_errors = False
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regex = re2.compile(value, options=options)
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except re2.error as e:
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if len(e.args) >= 1:
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if isinstance(e.args[0], str): # nocoverage
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raise ValidationError(_("Bad regular expression: {regex}").format(regex=e.args[0]))
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if isinstance(e.args[0], bytes):
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raise ValidationError(
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_("Bad regular expression: {regex}").format(regex=e.args[0].decode())
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)
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raise ValidationError(_("Unknown regular expression error")) # nocoverage
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return regex
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def url_template_validator(value: str) -> None:
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"""Validate as a URL template"""
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if not uri_template.validate(value):
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raise ValidationError(_("Invalid URL template."))
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class RealmFilter(models.Model):
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"""Realm-specific regular expressions to automatically linkify certain
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strings inside the Markdown processor. See "Custom filters" in the settings UI.
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"""
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realm = models.ForeignKey(Realm, on_delete=CASCADE)
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pattern = models.TextField()
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url_template = models.TextField(validators=[url_template_validator])
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# Linkifiers are applied in a message/topic in order; the processing order
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# is important when there are overlapping patterns.
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order = models.IntegerField(default=0)
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class Meta:
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unique_together = ("realm", "pattern")
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@override
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def __str__(self) -> str:
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return f"{self.realm.string_id}: {self.pattern} {self.url_template}"
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@override
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def clean(self) -> None:
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"""Validate whether the set of parameters in the URL template
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match the set of parameters in the regular expression.
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Django's `full_clean` calls `clean_fields` followed by `clean` method
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and stores all ValidationErrors from all stages to return as JSON.
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"""
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# Extract variables present in the pattern
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pattern = filter_pattern_validator(self.pattern)
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group_set = set(pattern.groupindex.keys())
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# Do not continue the check if the url template is invalid to begin with.
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# The ValidationError for invalid template will only be raised by the validator
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# set on the url_template field instead of here to avoid duplicates.
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if not uri_template.validate(self.url_template):
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return
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# Extract variables used in the URL template.
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template_variables_set = set(uri_template.URITemplate(self.url_template).variable_names)
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# Report patterns missing in linkifier pattern.
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missing_in_pattern_set = template_variables_set - group_set
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if len(missing_in_pattern_set) > 0:
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name = min(missing_in_pattern_set)
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raise ValidationError(
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_("Group %(name)r in URL template is not present in linkifier pattern."),
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params={"name": name},
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)
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missing_in_url_set = group_set - template_variables_set
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# Report patterns missing in URL template.
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if len(missing_in_url_set) > 0:
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# We just report the first missing pattern here. Users can
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# incrementally resolve errors if there are multiple
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# missing patterns.
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name = min(missing_in_url_set)
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raise ValidationError(
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_("Group %(name)r in linkifier pattern is not present in URL template."),
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params={"name": name},
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)
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def get_linkifiers_cache_key(realm_id: int) -> str:
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return f"{cache.KEY_PREFIX}:all_linkifiers_for_realm:{realm_id}"
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@return_same_value_during_entire_request
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@cache_with_key(get_linkifiers_cache_key, timeout=3600 * 24 * 7)
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def linkifiers_for_realm(realm_id: int) -> List[LinkifierDict]:
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return [
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LinkifierDict(
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pattern=linkifier.pattern,
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url_template=linkifier.url_template,
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id=linkifier.id,
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)
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for linkifier in RealmFilter.objects.filter(realm_id=realm_id).order_by("order")
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]
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def flush_linkifiers(*, instance: RealmFilter, **kwargs: object) -> None:
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realm_id = instance.realm_id
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cache_delete(get_linkifiers_cache_key(realm_id))
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flush_per_request_cache("linkifiers_for_realm")
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post_save.connect(flush_linkifiers, sender=RealmFilter)
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post_delete.connect(flush_linkifiers, sender=RealmFilter)
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