diff options
Diffstat (limited to 'rust/src/push')
| -rw-r--r-- | rust/src/push/base_rules.rs | 1 | ||||
| -rw-r--r-- | rust/src/push/evaluator.rs | 374 | ||||
| -rw-r--r-- | rust/src/push/mod.rs | 28 | ||||
| -rw-r--r-- | rust/src/push/utils.rs | 215 |
4 files changed, 610 insertions, 8 deletions
diff --git a/rust/src/push/base_rules.rs b/rust/src/push/base_rules.rs index 7c62bc4849..bb59676bde 100644 --- a/rust/src/push/base_rules.rs +++ b/rust/src/push/base_rules.rs @@ -262,6 +262,7 @@ pub const BASE_APPEND_UNDERRIDE_RULES: &[PushRule] = &[ priority_class: 1, conditions: Cow::Borrowed(&[Condition::Known(KnownCondition::RelationMatch { rel_type: Cow::Borrowed("m.thread"), + event_type_pattern: None, sender: None, sender_type: Some(Cow::Borrowed("user_id")), })]), diff --git a/rust/src/push/evaluator.rs b/rust/src/push/evaluator.rs new file mode 100644 index 0000000000..efe88ec76e --- /dev/null +++ b/rust/src/push/evaluator.rs @@ -0,0 +1,374 @@ +// Copyright 2022 The Matrix.org Foundation C.I.C. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +use std::{ + borrow::Cow, + collections::{BTreeMap, BTreeSet}, +}; + +use anyhow::{Context, Error}; +use lazy_static::lazy_static; +use log::warn; +use pyo3::prelude::*; +use regex::Regex; + +use super::{ + utils::{get_glob_matcher, get_localpart_from_id, GlobMatchType}, + Action, Condition, EventMatchCondition, FilteredPushRules, KnownCondition, +}; + +lazy_static! { + /// Used to parse the `is` clause in the room member count condition. + static ref INEQUALITY_EXPR: Regex = Regex::new(r"^([=<>]*)([0-9]+)$").expect("valid regex"); +} + +/// Allows running a set of push rules against a particular event. +#[pyclass] +pub struct PushRuleEvaluator { + /// A mapping of "flattened" keys to string values in the event, e.g. + /// includes things like "type" and "content.msgtype". + flattened_keys: BTreeMap<String, String>, + + /// The "content.body", if any. + body: String, + + /// The number of users in the room. + room_member_count: u64, + + /// The `notifications` section of the current power levels in the room. + notification_power_levels: BTreeMap<String, i64>, + + /// The relations related to the event as a mapping from relation type to + /// set of sender/event type 2-tuples. + relations: BTreeMap<String, BTreeSet<(String, String)>>, + + /// Is running "relation" conditions enabled? + relation_match_enabled: bool, + + /// The power level of the sender of the event, or None if event is an + /// outlier. + sender_power_level: Option<i64>, +} + +#[pymethods] +impl PushRuleEvaluator { + /// Create a new `PushRuleEvaluator`. See struct docstring for details. + #[new] + pub fn py_new( + flattened_keys: BTreeMap<String, String>, + room_member_count: u64, + sender_power_level: Option<i64>, + notification_power_levels: BTreeMap<String, i64>, + relations: BTreeMap<String, BTreeSet<(String, String)>>, + relation_match_enabled: bool, + ) -> Result<Self, Error> { + let body = flattened_keys + .get("content.body") + .cloned() + .unwrap_or_default(); + + Ok(PushRuleEvaluator { + flattened_keys, + body, + room_member_count, + notification_power_levels, + relations, + relation_match_enabled, + sender_power_level, + }) + } + + /// Run the evaluator with the given push rules, for the given user ID and + /// display name of the user. + /// + /// Passing in None will skip evaluating rules matching user ID and display + /// name. + /// + /// Returns the set of actions, if any, that match (filtering out any + /// `dont_notify` actions). + pub fn run( + &self, + push_rules: &FilteredPushRules, + user_id: Option<&str>, + display_name: Option<&str>, + ) -> Vec<Action> { + 'outer: for (push_rule, enabled) in push_rules.iter() { + if !enabled { + continue; + } + + for condition in push_rule.conditions.iter() { + match self.match_condition(condition, user_id, display_name) { + Ok(true) => {} + Ok(false) => continue 'outer, + Err(err) => { + warn!("Condition match failed {err}"); + continue 'outer; + } + } + } + + let actions = push_rule + .actions + .iter() + // Filter out "dont_notify" actions, as we don't store them. + .filter(|a| **a != Action::DontNotify) + .cloned() + .collect(); + + return actions; + } + + Vec::new() + } + + /// Check if the given condition matches. + fn matches( + &self, + condition: Condition, + user_id: Option<&str>, + display_name: Option<&str>, + ) -> bool { + match self.match_condition(&condition, user_id, display_name) { + Ok(true) => true, + Ok(false) => false, + Err(err) => { + warn!("Condition match failed {err}"); + false + } + } + } +} + +impl PushRuleEvaluator { + /// Match a given `Condition` for a push rule. + pub fn match_condition( + &self, + condition: &Condition, + user_id: Option<&str>, + display_name: Option<&str>, + ) -> Result<bool, Error> { + let known_condition = match condition { + Condition::Known(known) => known, + Condition::Unknown(_) => { + return Ok(false); + } + }; + + let result = match known_condition { + KnownCondition::EventMatch(event_match) => { + self.match_event_match(event_match, user_id)? + } + KnownCondition::ContainsDisplayName => { + if let Some(dn) = display_name { + if !dn.is_empty() { + get_glob_matcher(dn, GlobMatchType::Word)?.is_match(&self.body)? + } else { + // We specifically ignore empty display names, as otherwise + // they would always match. + false + } + } else { + false + } + } + KnownCondition::RoomMemberCount { is } => { + if let Some(is) = is { + self.match_member_count(is)? + } else { + false + } + } + KnownCondition::SenderNotificationPermission { key } => { + if let Some(sender_power_level) = &self.sender_power_level { + let required_level = self + .notification_power_levels + .get(key.as_ref()) + .copied() + .unwrap_or(50); + + *sender_power_level >= required_level + } else { + false + } + } + KnownCondition::RelationMatch { + rel_type, + event_type_pattern, + sender, + sender_type, + } => { + self.match_relations(rel_type, sender, sender_type, user_id, event_type_pattern)? + } + }; + + Ok(result) + } + + /// Evaluates a relation condition. + fn match_relations( + &self, + rel_type: &str, + sender: &Option<Cow<str>>, + sender_type: &Option<Cow<str>>, + user_id: Option<&str>, + event_type_pattern: &Option<Cow<str>>, + ) -> Result<bool, Error> { + // First check if relation matching is enabled... + if !self.relation_match_enabled { + return Ok(false); + } + + // ... and if there are any relations to match against. + let relations = if let Some(relations) = self.relations.get(rel_type) { + relations + } else { + return Ok(false); + }; + + // Extract the sender pattern from the condition + let sender_pattern = if let Some(sender) = sender { + Some(sender.as_ref()) + } else if let Some(sender_type) = sender_type { + if sender_type == "user_id" { + if let Some(user_id) = user_id { + Some(user_id) + } else { + return Ok(false); + } + } else { + warn!("Unrecognized sender_type: {sender_type}"); + return Ok(false); + } + } else { + None + }; + + let mut sender_compiled_pattern = if let Some(pattern) = sender_pattern { + Some(get_glob_matcher(pattern, GlobMatchType::Whole)?) + } else { + None + }; + + let mut type_compiled_pattern = if let Some(pattern) = event_type_pattern { + Some(get_glob_matcher(pattern, GlobMatchType::Whole)?) + } else { + None + }; + + for (relation_sender, event_type) in relations { + if let Some(pattern) = &mut sender_compiled_pattern { + if !pattern.is_match(relation_sender)? { + continue; + } + } + + if let Some(pattern) = &mut type_compiled_pattern { + if !pattern.is_match(event_type)? { + continue; + } + } + + return Ok(true); + } + + Ok(false) + } + + /// Evaluates a `event_match` condition. + fn match_event_match( + &self, + event_match: &EventMatchCondition, + user_id: Option<&str>, + ) -> Result<bool, Error> { + let pattern = if let Some(pattern) = &event_match.pattern { + pattern + } else if let Some(pattern_type) = &event_match.pattern_type { + // The `pattern_type` can either be "user_id" or "user_localpart", + // either way if we don't have a `user_id` then the condition can't + // match. + let user_id = if let Some(user_id) = user_id { + user_id + } else { + return Ok(false); + }; + + match &**pattern_type { + "user_id" => user_id, + "user_localpart" => get_localpart_from_id(user_id)?, + _ => return Ok(false), + } + } else { + return Ok(false); + }; + + let haystack = if let Some(haystack) = self.flattened_keys.get(&*event_match.key) { + haystack + } else { + return Ok(false); + }; + + // For the content.body we match against "words", but for everything + // else we match against the entire value. + let match_type = if event_match.key == "content.body" { + GlobMatchType::Word + } else { + GlobMatchType::Whole + }; + + let mut compiled_pattern = get_glob_matcher(pattern, match_type)?; + compiled_pattern.is_match(haystack) + } + + /// Match the member count against an 'is' condition + /// The `is` condition can be things like '>2', '==3' or even just '4'. + fn match_member_count(&self, is: &str) -> Result<bool, Error> { + let captures = INEQUALITY_EXPR.captures(is).context("bad 'is' clause")?; + let ineq = captures.get(1).map_or("==", |m| m.as_str()); + let rhs: u64 = captures + .get(2) + .context("missing number")? + .as_str() + .parse()?; + + let matches = match ineq { + "" | "==" => self.room_member_count == rhs, + "<" => self.room_member_count < rhs, + ">" => self.room_member_count > rhs, + ">=" => self.room_member_count >= rhs, + "<=" => self.room_member_count <= rhs, + _ => false, + }; + + Ok(matches) + } +} + +#[test] +fn push_rule_evaluator() { + let mut flattened_keys = BTreeMap::new(); + flattened_keys.insert("content.body".to_string(), "foo bar bob hello".to_string()); + let evaluator = PushRuleEvaluator::py_new( + flattened_keys, + 10, + Some(0), + BTreeMap::new(), + BTreeMap::new(), + true, + ) + .unwrap(); + + let result = evaluator.run(&FilteredPushRules::default(), None, Some("bob")); + assert_eq!(result.len(), 3); +} diff --git a/rust/src/push/mod.rs b/rust/src/push/mod.rs index de6764e7c5..30fffc31ad 100644 --- a/rust/src/push/mod.rs +++ b/rust/src/push/mod.rs @@ -42,7 +42,6 @@ //! //! The set of "base rules" are the list of rules that every user has by default. A //! user can modify their copy of the push rules in one of three ways: -//! //! 1. Adding a new push rule of a certain kind //! 2. Changing the actions of a base rule //! 3. Enabling/disabling a base rule. @@ -58,12 +57,16 @@ use std::collections::{BTreeMap, HashMap, HashSet}; use anyhow::{Context, Error}; use log::warn; use pyo3::prelude::*; -use pythonize::pythonize; +use pythonize::{depythonize, pythonize}; use serde::de::Error as _; use serde::{Deserialize, Serialize}; use serde_json::Value; +use self::evaluator::PushRuleEvaluator; + mod base_rules; +pub mod evaluator; +pub mod utils; /// Called when registering modules with python. pub fn register_module(py: Python<'_>, m: &PyModule) -> PyResult<()> { @@ -71,6 +74,7 @@ pub fn register_module(py: Python<'_>, m: &PyModule) -> PyResult<()> { child_module.add_class::<PushRule>()?; child_module.add_class::<PushRules>()?; child_module.add_class::<FilteredPushRules>()?; + child_module.add_class::<PushRuleEvaluator>()?; child_module.add_function(wrap_pyfunction!(get_base_rule_ids, m)?)?; m.add_submodule(child_module)?; @@ -274,6 +278,8 @@ pub enum KnownCondition { #[serde(rename = "org.matrix.msc3772.relation_match")] RelationMatch { rel_type: Cow<'static, str>, + #[serde(skip_serializing_if = "Option::is_none", rename = "type")] + event_type_pattern: Option<Cow<'static, str>>, #[serde(skip_serializing_if = "Option::is_none")] sender: Option<Cow<'static, str>>, #[serde(skip_serializing_if = "Option::is_none")] @@ -287,20 +293,26 @@ impl IntoPy<PyObject> for Condition { } } +impl<'source> FromPyObject<'source> for Condition { + fn extract(ob: &'source PyAny) -> PyResult<Self> { + Ok(depythonize(ob)?) + } +} + /// The body of a [`Condition::EventMatch`] #[derive(Serialize, Deserialize, Debug, Clone)] pub struct EventMatchCondition { - key: Cow<'static, str>, + pub key: Cow<'static, str>, #[serde(skip_serializing_if = "Option::is_none")] - pattern: Option<Cow<'static, str>>, + pub pattern: Option<Cow<'static, str>>, #[serde(skip_serializing_if = "Option::is_none")] - pattern_type: Option<Cow<'static, str>>, + pub pattern_type: Option<Cow<'static, str>>, } /// The collection of push rules for a user. #[derive(Debug, Clone, Default)] #[pyclass(frozen)] -struct PushRules { +pub struct PushRules { /// Custom push rules that override a base rule. overridden_base_rules: HashMap<Cow<'static, str>, PushRule>, @@ -319,7 +331,7 @@ struct PushRules { #[pymethods] impl PushRules { #[new] - fn new(rules: Vec<PushRule>) -> PushRules { + pub fn new(rules: Vec<PushRule>) -> PushRules { let mut push_rules: PushRules = Default::default(); for rule in rules { @@ -396,7 +408,7 @@ pub struct FilteredPushRules { #[pymethods] impl FilteredPushRules { #[new] - fn py_new( + pub fn py_new( push_rules: PushRules, enabled_map: BTreeMap<String, bool>, msc3786_enabled: bool, diff --git a/rust/src/push/utils.rs b/rust/src/push/utils.rs new file mode 100644 index 0000000000..8759340473 --- /dev/null +++ b/rust/src/push/utils.rs @@ -0,0 +1,215 @@ +// Copyright 2022 The Matrix.org Foundation C.I.C. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +use anyhow::bail; +use anyhow::Context; +use anyhow::Error; +use lazy_static::lazy_static; +use regex; +use regex::Regex; +use regex::RegexBuilder; + +lazy_static! { + /// Matches runs of non-wildcard characters followed by wildcard characters. + static ref WILDCARD_RUN: Regex = Regex::new(r"([^\?\*]*)([\?\*]*)").expect("valid regex"); +} + +/// Extract the localpart from a Matrix style ID +pub(crate) fn get_localpart_from_id(id: &str) -> Result<&str, Error> { + let (localpart, _) = id + .split_once(':') + .with_context(|| format!("ID does not contain colon: {id}"))?; + + // We need to strip off the first character, which is the ID type. + if localpart.is_empty() { + bail!("Invalid ID {id}"); + } + + Ok(&localpart[1..]) +} + +/// Used by `glob_to_regex` to specify what to match the regex against. +#[derive(Debug, Clone, Copy, PartialEq, Eq)] +pub enum GlobMatchType { + /// The generated regex will match against the entire input. + Whole, + /// The generated regex will match against words. + Word, +} + +/// Convert a "glob" style expression to a regex, anchoring either to the entire +/// input or to individual words. +pub fn glob_to_regex(glob: &str, match_type: GlobMatchType) -> Result<Regex, Error> { + let mut chunks = Vec::new(); + + // Patterns with wildcards must be simplified to avoid performance cliffs + // - The glob `?**?**?` is equivalent to the glob `???*` + // - The glob `???*` is equivalent to the regex `.{3,}` + for captures in WILDCARD_RUN.captures_iter(glob) { + if let Some(chunk) = captures.get(1) { + chunks.push(regex::escape(chunk.as_str())); + } + + if let Some(wildcards) = captures.get(2) { + if wildcards.as_str() == "" { + continue; + } + + let question_marks = wildcards.as_str().chars().filter(|c| *c == '?').count(); + + if wildcards.as_str().contains('*') { + chunks.push(format!(".{{{question_marks},}}")); + } else { + chunks.push(format!(".{{{question_marks}}}")); + } + } + } + + let joined = chunks.join(""); + + let regex_str = match match_type { + GlobMatchType::Whole => format!(r"\A{joined}\z"), + + // `^|\W` and `\W|$` handle the case where `pattern` starts or ends with a non-word + // character. + GlobMatchType::Word => format!(r"(?:^|\b|\W){joined}(?:\b|\W|$)"), + }; + + Ok(RegexBuilder::new(®ex_str) + .case_insensitive(true) + .build()?) +} + +/// Compiles the glob into a `Matcher`. +pub fn get_glob_matcher(glob: &str, match_type: GlobMatchType) -> Result<Matcher, Error> { + // There are a number of shortcuts we can make if the glob doesn't contain a + // wild card. + let matcher = if glob.contains(['*', '?']) { + let regex = glob_to_regex(glob, match_type)?; + Matcher::Regex(regex) + } else if match_type == GlobMatchType::Whole { + // If there aren't any wildcards and we're matching the whole thing, + // then we simply can do a case-insensitive string match. + Matcher::Whole(glob.to_lowercase()) + } else { + // Otherwise, if we're matching against words then can first check + // if the haystack contains the glob at all. + Matcher::Word { + word: glob.to_lowercase(), + regex: None, + } + }; + + Ok(matcher) +} + +/// Matches against a glob +pub enum Matcher { + /// Plain regex matching. + Regex(Regex), + + /// Case-insensitive equality. + Whole(String), + + /// Word matching. `regex` is a cache of calling [`glob_to_regex`] on word. + Word { word: String, regex: Option<Regex> }, +} + +impl Matcher { + /// Checks if the glob matches the given haystack. + pub fn is_match(&mut self, haystack: &str) -> Result<bool, Error> { + // We want to to do case-insensitive matching, so we convert to + // lowercase first. + let haystack = haystack.to_lowercase(); + + match self { + Matcher::Regex(regex) => Ok(regex.is_match(&haystack)), + Matcher::Whole(whole) => Ok(whole == &haystack), + Matcher::Word { word, regex } => { + // If we're looking for a literal word, then we first check if + // the haystack contains the word as a substring. + if !haystack.contains(&*word) { + return Ok(false); + } + + // If it does contain the word as a substring, then we need to + // check if it is an actual word by testing it against the regex. + let regex = if let Some(regex) = regex { + regex + } else { + let compiled_regex = glob_to_regex(word, GlobMatchType::Word)?; + regex.insert(compiled_regex) + }; + + Ok(regex.is_match(&haystack)) + } + } + } +} + +#[test] +fn test_get_domain_from_id() { + get_localpart_from_id("").unwrap_err(); + get_localpart_from_id(":").unwrap_err(); + get_localpart_from_id(":asd").unwrap_err(); + get_localpart_from_id("::as::asad").unwrap_err(); + + assert_eq!(get_localpart_from_id("@test:foo").unwrap(), "test"); + assert_eq!(get_localpart_from_id("@:").unwrap(), ""); + assert_eq!(get_localpart_from_id("@test:foo:907").unwrap(), "test"); +} + +#[test] +fn tset_glob() -> Result<(), Error> { + assert_eq!( + glob_to_regex("simple", GlobMatchType::Whole)?.as_str(), + r"\Asimple\z" + ); + assert_eq!( + glob_to_regex("simple*", GlobMatchType::Whole)?.as_str(), + r"\Asimple.{0,}\z" + ); + assert_eq!( + glob_to_regex("simple?", GlobMatchType::Whole)?.as_str(), + r"\Asimple.{1}\z" + ); + assert_eq!( + glob_to_regex("simple?*?*", GlobMatchType::Whole)?.as_str(), + r"\Asimple.{2,}\z" + ); + assert_eq!( + glob_to_regex("simple???", GlobMatchType::Whole)?.as_str(), + r"\Asimple.{3}\z" + ); + + assert_eq!( + glob_to_regex("escape.", GlobMatchType::Whole)?.as_str(), + r"\Aescape\.\z" + ); + + assert!(glob_to_regex("simple", GlobMatchType::Whole)?.is_match("simple")); + assert!(!glob_to_regex("simple", GlobMatchType::Whole)?.is_match("simples")); + assert!(glob_to_regex("simple*", GlobMatchType::Whole)?.is_match("simples")); + assert!(glob_to_regex("simple?", GlobMatchType::Whole)?.is_match("simples")); + assert!(glob_to_regex("simple*", GlobMatchType::Whole)?.is_match("simple")); + + assert!(glob_to_regex("simple", GlobMatchType::Word)?.is_match("some simple.")); + assert!(glob_to_regex("simple", GlobMatchType::Word)?.is_match("simple")); + assert!(!glob_to_regex("simple", GlobMatchType::Word)?.is_match("simples")); + + assert!(glob_to_regex("@user:foo", GlobMatchType::Word)?.is_match("Some @user:foo test")); + assert!(glob_to_regex("@user:foo", GlobMatchType::Word)?.is_match("@user:foo")); + + Ok(()) +} |