Cross-signing storage code (#1959)

keyserver/storage/postgres/cross_signing_keys_table.go

@@ -0,0 +1,102 @@
+// Copyright 2021 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"
+	"fmt"
+
+	"github.com/matrix-org/dendrite/internal"
+	"github.com/matrix-org/dendrite/internal/sqlutil"
+	"github.com/matrix-org/dendrite/keyserver/storage/tables"
+	"github.com/matrix-org/dendrite/keyserver/types"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+var crossSigningKeysSchema = `
+CREATE TABLE IF NOT EXISTS keyserver_cross_signing_keys (
+    user_id TEXT NOT NULL,
+	key_type SMALLINT NOT NULL,
+	key_data TEXT NOT NULL,
+	PRIMARY KEY (user_id, key_type)
+);
+`
+
+const selectCrossSigningKeysForUserSQL = "" +
+	"SELECT key_type, key_data FROM keyserver_cross_signing_keys" +
+	" WHERE user_id = $1"
+
+const upsertCrossSigningKeysForUserSQL = "" +
+	"INSERT INTO keyserver_cross_signing_keys (user_id, key_type, key_data)" +
+	" VALUES($1, $2, $3)" +
+	" ON CONFLICT (user_id, key_type) DO UPDATE SET key_data = $3"
+
+type crossSigningKeysStatements struct {
+	db                                *sql.DB
+	selectCrossSigningKeysForUserStmt *sql.Stmt
+	upsertCrossSigningKeysForUserStmt *sql.Stmt
+}
+
+func NewPostgresCrossSigningKeysTable(db *sql.DB) (tables.CrossSigningKeys, error) {
+	s := &crossSigningKeysStatements{
+		db: db,
+	}
+	_, err := db.Exec(crossSigningKeysSchema)
+	if err != nil {
+		return nil, err
+	}
+	return s, sqlutil.StatementList{
+		{&s.selectCrossSigningKeysForUserStmt, selectCrossSigningKeysForUserSQL},
+		{&s.upsertCrossSigningKeysForUserStmt, upsertCrossSigningKeysForUserSQL},
+	}.Prepare(db)
+}
+
+func (s *crossSigningKeysStatements) SelectCrossSigningKeysForUser(
+	ctx context.Context, txn *sql.Tx, userID string,
+) (r types.CrossSigningKeyMap, err error) {
+	rows, err := sqlutil.TxStmt(txn, s.selectCrossSigningKeysForUserStmt).QueryContext(ctx, userID)
+	if err != nil {
+		return nil, err
+	}
+	defer internal.CloseAndLogIfError(ctx, rows, "selectCrossSigningKeysForUserStmt: rows.close() failed")
+	r = types.CrossSigningKeyMap{}
+	for rows.Next() {
+		var keyTypeInt int16
+		var keyData gomatrixserverlib.Base64Bytes
+		if err := rows.Scan(&keyTypeInt, &keyData); err != nil {
+			return nil, err
+		}
+		keyType, ok := types.KeyTypeIntToPurpose[keyTypeInt]
+		if !ok {
+			return nil, fmt.Errorf("unknown key purpose int %d", keyTypeInt)
+		}
+		r[keyType] = keyData
+	}
+	return
+}
+
+func (s *crossSigningKeysStatements) UpsertCrossSigningKeysForUser(
+	ctx context.Context, txn *sql.Tx, userID string, keyType gomatrixserverlib.CrossSigningKeyPurpose, keyData gomatrixserverlib.Base64Bytes,
+) error {
+	keyTypeInt, ok := types.KeyTypePurposeToInt[keyType]
+	if !ok {
+		return fmt.Errorf("unknown key purpose %q", keyType)
+	}
+	if _, err := sqlutil.TxStmt(txn, s.upsertCrossSigningKeysForUserStmt).ExecContext(ctx, userID, keyTypeInt, keyData); err != nil {
+		return fmt.Errorf("s.upsertCrossSigningKeysForUserStmt: %w", err)
+	}
+	return nil
+}