Function prepareSyncStorage

src/background/utils/extension-api.ts:100–121

(values: T)

}

function prepareSyncStorage<T extends {[key: string]: any}>(values: T): {[key: string]: any} {
    for (const key in values) {
        const value = values[key];
        const string = JSON.stringify(value);
        // The maximum size of any one item that each extension is allowed to store in the sync storage area,
        // as measured by the JSON stringification of the item's value plus the length of its key.
        // Source: https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/storage/sync
        const totalLength = string.length + key.length;
        if (totalLength > chrome.storage.sync.QUOTA_BYTES_PER_ITEM) {
            // This length limit permits us to store up to 1000 = (parseInt('rr', 36) + 1) records.
            const maxLength = chrome.storage.sync.QUOTA_BYTES_PER_ITEM - key.length - 1 - 2;
            const minimalKeysNeeded = Math.ceil(string.length / maxLength);
            for (let i = 0; i < minimalKeysNeeded; i++) {
                (values as any)[`${key}_${i.toString(36)}`] = string.substring(i * maxLength, (i + 1) * maxLength);
            }
            (values as any)[key] = {
                __meta_split_count: minimalKeysNeeded,
            };
        }
    }
    return values;
}

export async function writeSyncStorage<T extends {[key: string]: any}>(values: T): Promise<void> {
    return new Promise<void>((resolve, reject) => {