/* * Copyright (C) 2019-2020 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']; let labelIndex = 0; while (size >= base) { 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; } } }