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// Copyright 2020 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.
package sqlite3
import (
"context"
"database/sql"
"github.com/matrix-org/dendrite/internal/sqlutil"
"github.com/matrix-org/dendrite/roomserver/storage/tables"
)
const redactionsSchema = `
-- Stores information about the redacted state of events.
-- We need to track redactions rather than blindly updating the event JSON table on receipt of a redaction
-- because we might receive the redaction BEFORE we receive the event which it redacts (think backfill).
CREATE TABLE IF NOT EXISTS roomserver_redactions (
redaction_event_id TEXT PRIMARY KEY,
redacts_event_id TEXT NOT NULL,
-- Initially FALSE, set to TRUE when the redaction has been validated according to rooms v3+ spec
-- https://matrix.org/docs/spec/rooms/v3#authorization-rules-for-events
validated BOOLEAN NOT NULL
);
`
const insertRedactionSQL = "" +
"INSERT OR IGNORE INTO roomserver_redactions (redaction_event_id, redacts_event_id, validated)" +
" VALUES ($1, $2, $3)"
const selectRedactionInfoByRedactionEventIDSQL = "" +
"SELECT redaction_event_id, redacts_event_id, validated FROM roomserver_redactions" +
" WHERE redaction_event_id = $1"
const selectRedactionInfoByEventBeingRedactedSQL = "" +
"SELECT redaction_event_id, redacts_event_id, validated FROM roomserver_redactions" +
" WHERE redacts_event_id = $1"
const markRedactionValidatedSQL = "" +
" UPDATE roomserver_redactions SET validated = $1 WHERE redaction_event_id = $2"
type redactionStatements struct {
db *sql.DB
insertRedactionStmt *sql.Stmt
selectRedactionInfoByRedactionEventIDStmt *sql.Stmt
selectRedactionInfoByEventBeingRedactedStmt *sql.Stmt
markRedactionValidatedStmt *sql.Stmt
}
func CreateRedactionsTable(db *sql.DB) error {
_, err := db.Exec(redactionsSchema)
return err
}
func PrepareRedactionsTable(db *sql.DB) (tables.Redactions, error) {
s := &redactionStatements{
db: db,
}
return s, sqlutil.StatementList{
{&s.insertRedactionStmt, insertRedactionSQL},
{&s.selectRedactionInfoByRedactionEventIDStmt, selectRedactionInfoByRedactionEventIDSQL},
{&s.selectRedactionInfoByEventBeingRedactedStmt, selectRedactionInfoByEventBeingRedactedSQL},
{&s.markRedactionValidatedStmt, markRedactionValidatedSQL},
}.Prepare(db)
}
func (s *redactionStatements) InsertRedaction(
ctx context.Context, txn *sql.Tx, info tables.RedactionInfo,
) error {
stmt := sqlutil.TxStmt(txn, s.insertRedactionStmt)
_, err := stmt.ExecContext(ctx, info.RedactionEventID, info.RedactsEventID, info.Validated)
return err
}
func (s *redactionStatements) SelectRedactionInfoByRedactionEventID(
ctx context.Context, txn *sql.Tx, redactionEventID string,
) (info *tables.RedactionInfo, err error) {
info = &tables.RedactionInfo{}
stmt := sqlutil.TxStmt(txn, s.selectRedactionInfoByRedactionEventIDStmt)
err = stmt.QueryRowContext(ctx, redactionEventID).Scan(
&info.RedactionEventID, &info.RedactsEventID, &info.Validated,
)
if err == sql.ErrNoRows {
info = nil
err = nil
}
return
}
func (s *redactionStatements) SelectRedactionInfoByEventBeingRedacted(
ctx context.Context, txn *sql.Tx, eventID string,
) (info *tables.RedactionInfo, err error) {
info = &tables.RedactionInfo{}
stmt := sqlutil.TxStmt(txn, s.selectRedactionInfoByEventBeingRedactedStmt)
err = stmt.QueryRowContext(ctx, eventID).Scan(
&info.RedactionEventID, &info.RedactsEventID, &info.Validated,
)
if err == sql.ErrNoRows {
info = nil
err = nil
}
return
}
func (s *redactionStatements) MarkRedactionValidated(
ctx context.Context, txn *sql.Tx, redactionEventID string, validated bool,
) error {
stmt := sqlutil.TxStmt(txn, s.markRedactionValidatedStmt)
_, err := stmt.ExecContext(ctx, validated, redactionEventID)
return err
}
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