Refactor media storage layer, add tests (#2352)

* Refactor mediaapi storage layer

* Verify filetype before trying to create thumbnails

* Add media api storage tests

* Fix returned values

mediaapi/storage/sqlite3/mediaapi.go

@@ -0,0 +1,45 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 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 (
+	// Import the postgres database driver.
+	"github.com/matrix-org/dendrite/internal/sqlutil"
+	"github.com/matrix-org/dendrite/mediaapi/storage/shared"
+	"github.com/matrix-org/dendrite/setup/config"
+)
+
+// NewDatabase opens a SQLIte database.
+func NewDatabase(dbProperties *config.DatabaseOptions) (*shared.Database, error) {
+	db, err := sqlutil.Open(dbProperties)
+	if err != nil {
+		return nil, err
+	}
+	mediaRepo, err := NewSQLiteMediaRepositoryTable(db)
+	if err != nil {
+		return nil, err
+	}
+	thumbnails, err := NewSQLiteThumbnailsTable(db)
+	if err != nil {
+		return nil, err
+	}
+	return &shared.Database{
+		MediaRepository: mediaRepo,
+		Thumbnails:      thumbnails,
+		DB:              db,
+		Writer:          sqlutil.NewExclusiveWriter(),
+	}, nil
+}