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+/*
+ * Copyright (C) 2019-2021 Yomichan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+class StorageController {
+ constructor() {
+ this._mostRecentStorageEstimate = null;
+ this._storageEstimateFailed = false;
+ this._isUpdating = false;
+ this._persistentStorageCheckbox = false;
+ this._storageUsageNode = null;
+ this._storageQuotaNode = null;
+ this._storageUseFiniteNodes = null;
+ this._storageUseInfiniteNodes = null;
+ this._storageUseValidNodes = null;
+ this._storageUseInvalidNodes = null;
+ }
+
+ prepare() {
+ this._persistentStorageCheckbox = document.querySelector('#storage-persistent-checkbox');
+ this._storageUsageNodes = document.querySelectorAll('.storage-usage');
+ this._storageQuotaNodes = document.querySelectorAll('.storage-quota');
+ this._storageUseFiniteNodes = document.querySelectorAll('.storage-use-finite');
+ this._storageUseInfiniteNodes = document.querySelectorAll('.storage-use-infinite');
+ this._storageUseValidNodes = document.querySelectorAll('.storage-use-valid');
+ this._storageUseInvalidNodes = document.querySelectorAll('.storage-use-invalid');
+
+ this._preparePersistentStorage();
+ this.updateStats();
+ this._persistentStorageCheckbox.addEventListener('change', this._onPersistentStorageCheckboxChange.bind(this), false);
+ document.querySelector('#storage-refresh').addEventListener('click', this.updateStats.bind(this), false);
+ }
+
+ async updateStats() {
+ if (this._isUpdating) { return; }
+
+ try {
+ this._isUpdating = true;
+
+ const estimate = await this._storageEstimate();
+ const valid = (estimate !== null);
+
+ // Firefox reports usage as 0 when persistent storage is enabled.
+ const finite = valid && (estimate.usage > 0 || !(await this._isStoragePeristent()));
+ if (finite) {
+ for (const node of this._storageUsageNodes) {
+ node.textContent = this._bytesToLabeledString(estimate.usage);
+ }
+ for (const node of this._storageQuotaNodes) {
+ node.textContent = this._bytesToLabeledString(estimate.quota);
+ }
+ }
+
+ this._setElementsVisible(this._storageUseFiniteNodes, valid && finite);
+ this._setElementsVisible(this._storageUseInfiniteNodes, valid && !finite);
+ this._setElementsVisible(this._storageUseValidNodes, valid);
+ this._setElementsVisible(this._storageUseInvalidNodes, !valid);
+
+ return valid;
+ } finally {
+ this._isUpdating = false;
+ }
+ }
+
+ // Private
+
+ async _preparePersistentStorage() {
+ if (!(navigator.storage && navigator.storage.persist)) {
+ // Not supported
+ return;
+ }
+
+ const info = document.querySelector('#storage-persistent-info');
+ if (info !== null) { info.hidden = false; }
+
+ const isStoragePeristent = await this._isStoragePeristent();
+ this._updateCheckbox(isStoragePeristent);
+
+ const button = document.querySelector('#storage-persistent-button');
+ if (button !== null) {
+ button.hidden = false;
+ button.addEventListener('click', this._onPersistStorageButtonClick.bind(this), false);
+ }
+ }
+
+ _onPersistentStorageCheckboxChange(e) {
+ const node = e.currentTarget;
+ if (!node.checked) {
+ node.checked = true;
+ return;
+ }
+ this._attemptPersistStorage();
+ }
+
+ _onPersistStorageButtonClick() {
+ const {checked} = this._persistentStorageCheckbox;
+ if (checked) { return; }
+ this._persistentStorageCheckbox.checked = !checked;
+ this._persistentStorageCheckbox.dispatchEvent(new Event('change'));
+ }
+
+ async _attemptPersistStorage() {
+ if (await this._isStoragePeristent()) { return; }
+
+ let isStoragePeristent = false;
+ try {
+ isStoragePeristent = await navigator.storage.persist();
+ } catch (e) {
+ // NOP
+ }
+
+ this._updateCheckbox(isStoragePeristent);
+
+ if (isStoragePeristent) {
+ this.updateStats();
+ } else {
+ const node = document.querySelector('#storage-persistent-fail-warning');
+ if (node !== null) { node.hidden = false; }
+ }
+ }
+
+ async _storageEstimate() {
+ if (this._storageEstimateFailed && this._mostRecentStorageEstimate === null) {
+ return null;
+ }
+ try {
+ const value = await navigator.storage.estimate();
+ this._mostRecentStorageEstimate = value;
+ return value;
+ } catch (e) {
+ this._storageEstimateFailed = true;
+ }
+ return null;
+ }
+
+ _bytesToLabeledString(size) {
+ const base = 1000;
+ const labels = [' bytes', 'KB', 'MB', 'GB', 'TB'];
+ const maxLabelIndex = labels.length - 1;
+ let labelIndex = 0;
+ while (size >= base && labelIndex < maxLabelIndex) {
+ size /= base;
+ ++labelIndex;
+ }
+ const label = labelIndex === 0 ? `${size}` : size.toFixed(1);
+ return `${label}${labels[labelIndex]}`;
+ }
+
+ async _isStoragePeristent() {
+ try {
+ return await navigator.storage.persisted();
+ } catch (e) {
+ // NOP
+ }
+ return false;
+ }
+
+ _updateCheckbox(isStoragePeristent) {
+ const checkbox = this._persistentStorageCheckbox;
+ checkbox.checked = isStoragePeristent;
+ checkbox.readOnly = isStoragePeristent;
+ }
+
+ _setElementsVisible(elements, visible) {
+ visible = !visible;
+ for (const element of elements) {
+ element.hidden = visible;
+ }
+ }
+}