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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| import { strEqualsIgnoreCase, expiresInHours } from 'live-connect-common' | ||
| import { WrappedStorageHandler } from './handlers/storage-handler' | ||
| import { StorageStrategies, StorageStrategy } from './model/storage-strategy' | ||
|
|
||
| export type CacheRecord = { | ||
| data: string | ||
| expiresAt?: Date | ||
| } | ||
|
|
||
| export interface DurableCache { | ||
| get: (key: string) => CacheRecord | null // null is used to signal missing value | ||
| set: (key: string, value: string, expiration?: Date) => void | ||
| } | ||
|
|
||
| export type StorageHandlerBackedCacheOpts = { | ||
| strategy: 'cookie' | 'ls', | ||
| storageHandler: WrappedStorageHandler, | ||
| domain: string, | ||
| defaultExpirationHours?: number | ||
| } | ||
|
|
||
| export type MakeCacheOpts = StorageHandlerBackedCacheOpts & { | ||
| strategy: StorageStrategy, | ||
| } | ||
|
|
||
| export function makeCache(opts: MakeCacheOpts): DurableCache { | ||
| if (!strEqualsIgnoreCase(opts.strategy, StorageStrategies.cookie) && strEqualsIgnoreCase(opts.strategy, StorageStrategies.none)) { | ||
| return NoOpCache | ||
| } else { | ||
| // TODO: Remove once we validate config properly | ||
| const strategyWithDefault = opts.strategy ?? StorageStrategies.cookie | ||
| return new StorageHandlerBackedCache({ ...opts, strategy: strategyWithDefault }) | ||
| } | ||
| } | ||
|
|
||
| export class StorageHandlerBackedCache implements DurableCache { | ||
| private handler | ||
| private storageStrategy | ||
| private defaultExpirationHours? | ||
| private domain | ||
|
|
||
| constructor (opts: StorageHandlerBackedCacheOpts) { | ||
| this.handler = opts.storageHandler | ||
| this.storageStrategy = opts.strategy | ||
| this.defaultExpirationHours = opts.defaultExpirationHours | ||
| this.domain = opts.domain | ||
| } | ||
|
|
||
| private getCookieRecord(key: string): CacheRecord | null { | ||
| let expiresAt: Date | undefined | ||
|
|
||
| const cookieExpirationEntry = this.handler.getCookie(expirationKey(key)) | ||
| if (cookieExpirationEntry && cookieExpirationEntry.length > 0) { | ||
| expiresAt = new Date(cookieExpirationEntry) | ||
| if (expiresAt <= new Date()) { | ||
| return null | ||
| } | ||
| } | ||
|
|
||
| const data = this.handler.getCookie(key) | ||
| if (data) { | ||
| return { data, expiresAt } | ||
| } else { | ||
| return null | ||
| } | ||
| } | ||
|
|
||
| private getLSRecord(key: string): CacheRecord | null { | ||
| let expiresAt: Date | undefined | ||
| const oldLsExpirationEntry = this.handler.getDataFromLocalStorage(expirationKey(key)) | ||
|
|
||
| if (oldLsExpirationEntry) { | ||
| expiresAt = new Date(oldLsExpirationEntry) | ||
| if (expiresAt <= new Date()) { | ||
| this.handler.removeDataFromLocalStorage(key) | ||
| this.handler.removeDataFromLocalStorage(expirationKey(key)) | ||
| return null | ||
| } | ||
| } | ||
|
|
||
| const data = this.handler.getDataFromLocalStorage(key) | ||
| if (data) { | ||
| return { data, expiresAt } | ||
| } else { | ||
| return null | ||
| } | ||
| } | ||
|
|
||
| get(key: string): CacheRecord | null { | ||
| if (strEqualsIgnoreCase(this.storageStrategy, StorageStrategies.localStorage) && this.handler.localStorageIsEnabled()) { | ||
| return this.getLSRecord(key) | ||
| } else { | ||
| return this.getCookieRecord(key) | ||
| } | ||
| } | ||
|
|
||
| set(key: string, value: string, expires?: Date): void { | ||
| if (!expires && this.defaultExpirationHours) { | ||
| expires = expiresInHours(this.defaultExpirationHours) | ||
| } | ||
|
|
||
| if (strEqualsIgnoreCase(this.storageStrategy, StorageStrategies.localStorage) && this.handler.localStorageIsEnabled()) { | ||
| this.handler.setDataInLocalStorage(key, value) | ||
| if (expires) { | ||
| this.handler.setDataInLocalStorage(expirationKey(key), `${expires}`) | ||
| } else { | ||
| this.handler.removeDataFromLocalStorage(expirationKey(key)) | ||
| } | ||
| } else { | ||
| this.handler.setCookie(key, value, expires, 'Lax', this.domain) | ||
| if (expires) { | ||
| this.handler.setCookie(expirationKey(key), `${expires}`, expires, 'Lax', this.domain) | ||
| } else { | ||
| // sentinel value to indicate no expiration | ||
| this.handler.setCookie(expirationKey(key), '', undefined, 'Lax', this.domain) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| export const NoOpCache: DurableCache = { | ||
| get: () => null, | ||
| set: () => undefined | ||
| } | ||
|
|
||
| function expirationKey(baseKey: string): string { | ||
| return `${baseKey}_exp` | ||
| } |
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