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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 postgres
import (
"context"
"database/sql"
"time"
"github.com/lib/pq"
"github.com/matrix-org/dendrite/internal"
"github.com/matrix-org/dendrite/keyserver/api"
"github.com/matrix-org/dendrite/keyserver/storage/tables"
)
var deviceKeysSchema = `
-- Stores device keys for users
CREATE TABLE IF NOT EXISTS keyserver_device_keys (
user_id TEXT NOT NULL,
device_id TEXT NOT NULL,
ts_added_secs BIGINT NOT NULL,
key_json TEXT NOT NULL,
-- the stream ID of this key, scoped per-user. This gets updated when the device key changes.
-- This means we do not store an unbounded append-only log of device keys, which is not actually
-- required in the spec because in the event of a missed update the server fetches the entire
-- current set of keys rather than trying to 'fast-forward' or catchup missing stream IDs.
stream_id BIGINT NOT NULL,
display_name TEXT,
-- Clobber based on tuple of user/device.
CONSTRAINT keyserver_device_keys_unique UNIQUE (user_id, device_id)
);
`
const upsertDeviceKeysSQL = "" +
"INSERT INTO keyserver_device_keys (user_id, device_id, ts_added_secs, key_json, stream_id, display_name)" +
" VALUES ($1, $2, $3, $4, $5, $6)" +
" ON CONFLICT ON CONSTRAINT keyserver_device_keys_unique" +
" DO UPDATE SET key_json = $4, stream_id = $5, display_name = $6"
const selectDeviceKeysSQL = "" +
"SELECT key_json, stream_id, display_name FROM keyserver_device_keys WHERE user_id=$1 AND device_id=$2"
const selectBatchDeviceKeysSQL = "" +
"SELECT device_id, key_json, stream_id, display_name FROM keyserver_device_keys WHERE user_id=$1 AND key_json <> ''"
const selectMaxStreamForUserSQL = "" +
"SELECT MAX(stream_id) FROM keyserver_device_keys WHERE user_id=$1"
const countStreamIDsForUserSQL = "" +
"SELECT COUNT(*) FROM keyserver_device_keys WHERE user_id=$1 AND stream_id = ANY($2)"
const deleteAllDeviceKeysSQL = "" +
"DELETE FROM keyserver_device_keys WHERE user_id=$1"
type deviceKeysStatements struct {
db *sql.DB
upsertDeviceKeysStmt *sql.Stmt
selectDeviceKeysStmt *sql.Stmt
selectBatchDeviceKeysStmt *sql.Stmt
selectMaxStreamForUserStmt *sql.Stmt
countStreamIDsForUserStmt *sql.Stmt
deleteAllDeviceKeysStmt *sql.Stmt
}
func NewPostgresDeviceKeysTable(db *sql.DB) (tables.DeviceKeys, error) {
s := &deviceKeysStatements{
db: db,
}
_, err := db.Exec(deviceKeysSchema)
if err != nil {
return nil, err
}
if s.upsertDeviceKeysStmt, err = db.Prepare(upsertDeviceKeysSQL); err != nil {
return nil, err
}
if s.selectDeviceKeysStmt, err = db.Prepare(selectDeviceKeysSQL); err != nil {
return nil, err
}
if s.selectBatchDeviceKeysStmt, err = db.Prepare(selectBatchDeviceKeysSQL); err != nil {
return nil, err
}
if s.selectMaxStreamForUserStmt, err = db.Prepare(selectMaxStreamForUserSQL); err != nil {
return nil, err
}
if s.countStreamIDsForUserStmt, err = db.Prepare(countStreamIDsForUserSQL); err != nil {
return nil, err
}
if s.deleteAllDeviceKeysStmt, err = db.Prepare(deleteAllDeviceKeysSQL); err != nil {
return nil, err
}
return s, nil
}
func (s *deviceKeysStatements) SelectDeviceKeysJSON(ctx context.Context, keys []api.DeviceMessage) error {
for i, key := range keys {
var keyJSONStr string
var streamID int
var displayName sql.NullString
err := s.selectDeviceKeysStmt.QueryRowContext(ctx, key.UserID, key.DeviceID).Scan(&keyJSONStr, &streamID, &displayName)
if err != nil && err != sql.ErrNoRows {
return err
}
// this will be '' when there is no device
keys[i].KeyJSON = []byte(keyJSONStr)
keys[i].StreamID = streamID
if displayName.Valid {
keys[i].DisplayName = displayName.String
}
}
return nil
}
func (s *deviceKeysStatements) SelectMaxStreamIDForUser(ctx context.Context, txn *sql.Tx, userID string) (streamID int32, err error) {
// nullable if there are no results
var nullStream sql.NullInt32
err = txn.Stmt(s.selectMaxStreamForUserStmt).QueryRowContext(ctx, userID).Scan(&nullStream)
if err == sql.ErrNoRows {
err = nil
}
if nullStream.Valid {
streamID = nullStream.Int32
}
return
}
func (s *deviceKeysStatements) CountStreamIDsForUser(ctx context.Context, userID string, streamIDs []int64) (int, error) {
// nullable if there are no results
var count sql.NullInt32
err := s.countStreamIDsForUserStmt.QueryRowContext(ctx, userID, pq.Int64Array(streamIDs)).Scan(&count)
if err != nil {
return 0, err
}
if count.Valid {
return int(count.Int32), nil
}
return 0, nil
}
func (s *deviceKeysStatements) InsertDeviceKeys(ctx context.Context, txn *sql.Tx, keys []api.DeviceMessage) error {
for _, key := range keys {
now := time.Now().Unix()
_, err := txn.Stmt(s.upsertDeviceKeysStmt).ExecContext(
ctx, key.UserID, key.DeviceID, now, string(key.KeyJSON), key.StreamID, key.DisplayName,
)
if err != nil {
return err
}
}
return nil
}
func (s *deviceKeysStatements) DeleteAllDeviceKeys(ctx context.Context, txn *sql.Tx, userID string) error {
_, err := txn.Stmt(s.deleteAllDeviceKeysStmt).ExecContext(ctx, userID)
return err
}
func (s *deviceKeysStatements) SelectBatchDeviceKeys(ctx context.Context, userID string, deviceIDs []string) ([]api.DeviceMessage, error) {
rows, err := s.selectBatchDeviceKeysStmt.QueryContext(ctx, userID)
if err != nil {
return nil, err
}
defer internal.CloseAndLogIfError(ctx, rows, "selectBatchDeviceKeysStmt: rows.close() failed")
deviceIDMap := make(map[string]bool)
for _, d := range deviceIDs {
deviceIDMap[d] = true
}
var result []api.DeviceMessage
for rows.Next() {
var dk api.DeviceMessage
dk.UserID = userID
var keyJSON string
var streamID int
var displayName sql.NullString
if err := rows.Scan(&dk.DeviceID, &keyJSON, &streamID, &displayName); err != nil {
return nil, err
}
dk.KeyJSON = []byte(keyJSON)
dk.StreamID = streamID
if displayName.Valid {
dk.DisplayName = displayName.String
}
// include the key if we want all keys (no device) or it was asked
if deviceIDMap[dk.DeviceID] || len(deviceIDs) == 0 {
result = append(result, dk)
}
}
return result, rows.Err()
}
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