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condition.go
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condition.go
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// Copyright (c) 2020 Tulir Asokan
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package pushrules
import (
"regexp"
"strconv"
"strings"
"unicode"
"maunium.net/go/mautrix/event"
"maunium.net/go/mautrix/pushrules/glob"
)
// Room is an interface with the functions that are needed for processing room-specific push conditions
type Room interface {
GetOwnDisplayname() string
GetMemberCount() int
}
// PushCondKind is the type of a push condition.
type PushCondKind string
// The allowed push condition kinds as specified in section 11.12.1.4.3 of r0.3.0 of the Client-Server API.
const (
KindEventMatch PushCondKind = "event_match"
KindContainsDisplayName PushCondKind = "contains_display_name"
KindRoomMemberCount PushCondKind = "room_member_count"
)
// PushCondition wraps a condition that is required for a specific PushRule to be used.
type PushCondition struct {
// The type of the condition.
Kind PushCondKind `json:"kind"`
// The dot-separated field of the event to match. Only applicable if kind is EventMatch.
Key string `json:"key,omitempty"`
// The glob-style pattern to match the field against. Only applicable if kind is EventMatch.
Pattern string `json:"pattern,omitempty"`
// The condition that needs to be fulfilled for RoomMemberCount-type conditions.
// A decimal integer optionally prefixed by ==, <, >, >= or <=. Prefix "==" is assumed if no prefix found.
MemberCountCondition string `json:"is,omitempty"`
}
// MemberCountFilterRegex is the regular expression to parse the MemberCountCondition of PushConditions.
var MemberCountFilterRegex = regexp.MustCompile("^(==|[<>]=?)?([0-9]+)$")
// Match checks if this condition is fulfilled for the given event in the given room.
func (cond *PushCondition) Match(room Room, evt *event.Event) bool {
switch cond.Kind {
case KindEventMatch:
return cond.matchValue(room, evt)
case KindContainsDisplayName:
return cond.matchDisplayName(room, evt)
case KindRoomMemberCount:
return cond.matchMemberCount(room)
default:
return false
}
}
func (cond *PushCondition) matchValue(room Room, evt *event.Event) bool {
index := strings.IndexRune(cond.Key, '.')
key := cond.Key
subkey := ""
if index > 0 {
subkey = key[index+1:]
key = key[0:index]
}
pattern, err := glob.Compile(cond.Pattern)
if err != nil {
return false
}
switch key {
case "type":
return pattern.MatchString(evt.Type.String())
case "sender":
return pattern.MatchString(string(evt.Sender))
case "room_id":
return pattern.MatchString(string(evt.RoomID))
case "state_key":
if evt.StateKey == nil {
return cond.Pattern == ""
}
return pattern.MatchString(*evt.StateKey)
case "content":
val, _ := evt.Content.Raw[subkey].(string)
return pattern.MatchString(val)
default:
return false
}
}
func (cond *PushCondition) matchDisplayName(room Room, evt *event.Event) bool {
displayname := room.GetOwnDisplayname()
if len(displayname) == 0 {
return false
}
msg, ok := evt.Content.Raw["body"].(string)
if !ok {
return false
}
isAcceptable := func(r uint8) bool {
return unicode.IsSpace(rune(r)) || unicode.IsPunct(rune(r))
}
length := len(displayname)
for index := strings.Index(msg, displayname); index != -1; index = strings.Index(msg, displayname) {
if (index <= 0 || isAcceptable(msg[index-1])) && (index+length >= len(msg) || isAcceptable(msg[index+length])) {
return true
}
msg = msg[index+len(displayname):]
}
return false
}
func (cond *PushCondition) matchMemberCount(room Room) bool {
group := MemberCountFilterRegex.FindStringSubmatch(cond.MemberCountCondition)
if len(group) != 3 {
return false
}
operator := group[1]
wantedMemberCount, _ := strconv.Atoi(group[2])
memberCount := room.GetMemberCount()
switch operator {
case "==", "":
return memberCount == wantedMemberCount
case ">":
return memberCount > wantedMemberCount
case ">=":
return memberCount >= wantedMemberCount
case "<":
return memberCount < wantedMemberCount
case "<=":
return memberCount <= wantedMemberCount
default:
// Should be impossible due to regex.
return false
}
}