Move metadata files into new folder

src/modules/metadata/services/MetadataReader.ts

@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * 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 https://mozilla.org/MPL/2.0/.
+ */
+
+import { APP_METADATA_KEY_PREFIX, GLOBAL_METADATA_KEYS } from '@/modules/metadata/Metadata.constants.ts';
+import { DEFAULT_DEVICE, getActiveDevice } from '@/modules/device/services/Device.ts';
+import { applyMetadataMigrations } from '@/modules/metadata/services/MetadataMigrations.ts';
+import { convertValueFromMetadata } from '@/modules/metadata/services/MetadataConverter.ts';
+import {
+    AllowedMetadataValueTypes,
+    AppMetadataKeys,
+    Metadata,
+    MetadataHolder,
+} from '@/modules/metadata/Metadata.types.ts';
+
+export const getMetadataKey = (key: string, appPrefix: string = APP_METADATA_KEY_PREFIX) => {
+    const isGlobalMetadataKey = GLOBAL_METADATA_KEYS.includes(key as AppMetadataKeys);
+    const addActiveDevicePrefix = !isGlobalMetadataKey && getActiveDevice() !== DEFAULT_DEVICE;
+
+    return `${appPrefix}${addActiveDevicePrefix ? `${getActiveDevice()}_` : ''}${key}`;
+};
+
+export const doesMetadataKeyExistIn = (meta: Metadata | undefined, key: string, appPrefix?: string): boolean =>
+    Object.prototype.hasOwnProperty.call(meta ?? {}, getMetadataKey(key, appPrefix));
+
+export const getMetadataValueFrom = <Key extends AppMetadataKeys, Value extends AllowedMetadataValueTypes>(
+    { meta }: MetadataHolder,
+    key: Key,
+    defaultValue?: Value,
+    applyMigrations: boolean = true,
+): Value | undefined => {
+    const metadata = applyMigrations ? applyMetadataMigrations(meta) : meta;
+
+    if (metadata === undefined || !doesMetadataKeyExistIn(metadata, key)) {
+        return defaultValue;
+    }
+
+    return convertValueFromMetadata(metadata[getMetadataKey(key)]);
+};
+
+export const getMetadataFrom = <METADATA extends Partial<Metadata<AppMetadataKeys, AllowedMetadataValueTypes>>>(
+    { meta }: MetadataHolder,
+    metadataWithDefaultValues: METADATA,
+    applyMigrations?: boolean,
+): METADATA => {
+    const appMetadata = {} as METADATA;
+
+    Object.entries(metadataWithDefaultValues).forEach(([key, defaultValue]) => {
+        appMetadata[key as AppMetadataKeys] = getMetadataValueFrom(
+            { meta },
+            key as AppMetadataKeys,
+            defaultValue,
+            applyMigrations,
+        );
+    });
+
+    return appMetadata;
+};
+
+export const getAppMetadataFrom = (meta: Metadata, appPrefix: string = APP_METADATA_KEY_PREFIX): Metadata => {
+    const appMetadata: Metadata = {};
+
+    Object.entries(meta).forEach(([key, value]) => {
+        if (key.startsWith(appPrefix)) {
+            appMetadata[key] = value;
+        }
+    });
+
+    return appMetadata;
+};