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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 event
import (
"encoding/json"
"maunium.net/go/mautrix/id"
)
type RelationType string
const (
RelReplace RelationType = "m.replace"
RelReference RelationType = "m.reference"
RelAnnotation RelationType = "m.annotation"
RelThread RelationType = "m.thread"
)
type RelatesTo struct {
Type RelationType `json:"rel_type,omitempty"`
EventID id.EventID `json:"event_id,omitempty"`
Key string `json:"key,omitempty"`
InReplyTo *InReplyTo `json:"m.in_reply_to,omitempty"`
IsFallingBack bool `json:"is_falling_back,omitempty"`
}
type InReplyTo struct {
EventID id.EventID `json:"event_id,omitempty"`
UnstableRoomID id.RoomID `json:"room_id,omitempty"`
}
func (rel *RelatesTo) Copy() *RelatesTo {
if rel == nil {
return nil
}
cp := *rel
return &cp
}
func (rel *RelatesTo) GetReplaceID() id.EventID {
if rel != nil && rel.Type == RelReplace {
return rel.EventID
}
return ""
}
func (rel *RelatesTo) GetReferenceID() id.EventID {
if rel != nil && rel.Type == RelReference {
return rel.EventID
}
return ""
}
func (rel *RelatesTo) GetThreadParent() id.EventID {
if rel != nil && rel.Type == RelThread {
return rel.EventID
}
return ""
}
func (rel *RelatesTo) GetReplyTo() id.EventID {
if rel != nil && rel.InReplyTo != nil {
return rel.InReplyTo.EventID
}
return ""
}
func (rel *RelatesTo) GetNonFallbackReplyTo() id.EventID {
if rel != nil && rel.InReplyTo != nil && (rel.Type != RelThread || !rel.IsFallingBack) {
return rel.InReplyTo.EventID
}
return ""
}
func (rel *RelatesTo) GetAnnotationID() id.EventID {
if rel != nil && rel.Type == RelAnnotation {
return rel.EventID
}
return ""
}
func (rel *RelatesTo) GetAnnotationKey() string {
if rel != nil && rel.Type == RelAnnotation {
return rel.Key
}
return ""
}
func (rel *RelatesTo) SetReplace(mxid id.EventID) *RelatesTo {
rel.Type = RelReplace
rel.EventID = mxid
return rel
}
func (rel *RelatesTo) SetReplyTo(mxid id.EventID) *RelatesTo {
rel.InReplyTo = &InReplyTo{EventID: mxid}
rel.IsFallingBack = false
return rel
}
func (rel *RelatesTo) SetThread(mxid, fallback id.EventID) *RelatesTo {
rel.Type = RelThread
rel.EventID = mxid
if fallback != "" && rel.GetReplyTo() == "" {
rel.SetReplyTo(fallback)
rel.IsFallingBack = true
}
return rel
}
func (rel *RelatesTo) SetAnnotation(mxid id.EventID, key string) *RelatesTo {
rel.Type = RelAnnotation
rel.EventID = mxid
rel.Key = key
return rel
}
type RelationChunkItem struct {
Type RelationType `json:"type"`
EventID string `json:"event_id,omitempty"`
Key string `json:"key,omitempty"`
Count int `json:"count,omitempty"`
}
type RelationChunk struct {
Chunk []RelationChunkItem `json:"chunk"`
Limited bool `json:"limited"`
Count int `json:"count"`
}
type AnnotationChunk struct {
RelationChunk
Map map[string]int `json:"-"`
}
type serializableAnnotationChunk AnnotationChunk
func (ac *AnnotationChunk) UnmarshalJSON(data []byte) error {
if err := json.Unmarshal(data, (*serializableAnnotationChunk)(ac)); err != nil {
return err
}
ac.Map = make(map[string]int)
for _, item := range ac.Chunk {
if item.Key != "" {
ac.Map[item.Key] += item.Count
}
}
return nil
}
func (ac *AnnotationChunk) Serialize() RelationChunk {
ac.Chunk = make([]RelationChunkItem, len(ac.Map))
i := 0
for key, count := range ac.Map {
ac.Chunk[i] = RelationChunkItem{
Type: RelAnnotation,
Key: key,
Count: count,
}
i++
}
return ac.RelationChunk
}
type EventIDChunk struct {
RelationChunk
List []string `json:"-"`
}
type serializableEventIDChunk EventIDChunk
func (ec *EventIDChunk) UnmarshalJSON(data []byte) error {
if err := json.Unmarshal(data, (*serializableEventIDChunk)(ec)); err != nil {
return err
}
for _, item := range ec.Chunk {
ec.List = append(ec.List, item.EventID)
}
return nil
}
func (ec *EventIDChunk) Serialize(typ RelationType) RelationChunk {
ec.Chunk = make([]RelationChunkItem, len(ec.List))
for i, eventID := range ec.List {
ec.Chunk[i] = RelationChunkItem{
Type: typ,
EventID: eventID,
}
}
return ec.RelationChunk
}
type Relations struct {
Raw map[RelationType]RelationChunk `json:"-"`
Annotations AnnotationChunk `json:"m.annotation,omitempty"`
References EventIDChunk `json:"m.reference,omitempty"`
Replaces EventIDChunk `json:"m.replace,omitempty"`
}
type serializableRelations Relations
func (relations *Relations) UnmarshalJSON(data []byte) error {
if err := json.Unmarshal(data, &relations.Raw); err != nil {
return err
}
return json.Unmarshal(data, (*serializableRelations)(relations))
}
func (relations *Relations) MarshalJSON() ([]byte, error) {
if relations.Raw == nil {
relations.Raw = make(map[RelationType]RelationChunk)
}
relations.Raw[RelAnnotation] = relations.Annotations.Serialize()
relations.Raw[RelReference] = relations.References.Serialize(RelReference)
relations.Raw[RelReplace] = relations.Replaces.Serialize(RelReplace)
for key, item := range relations.Raw {
if !item.Limited {
item.Count = len(item.Chunk)
}
if item.Count == 0 {
delete(relations.Raw, key)
}
}
return json.Marshal(relations.Raw)
}
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