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import * as React from "react"
import { useEffect, useReducer } from "react"
import * as Cookies from "js-cookie"
import { CookiePreferences } from "../site/blocks/CookiePreferences"
import { CookieNotice } from "../site/CookieNotice"
import moment from "moment"
export enum PreferenceType {
Analytics = "a",
Marketing = "m", // not used
}
export enum Action {
Accept,
TogglePreference,
Reset,
}
export interface Preference {
type: PreferenceType
value: boolean
}
export const POLICY_DATE: number = 20201009
export const DATE_FORMAT = "YYYYMMDD"
const COOKIE_NAME = "cookie_preferences"
const PREFERENCES_SEPARATOR = "|"
const DATE_SEPARATOR = "-"
const PREFERENCE_KEY_VALUE_SEPARATOR = ":"
// e.g. p:1-20200910
interface State {
date?: number
preferences: Preference[]
}
const defaultState: State = {
preferences: [
{
type: PreferenceType.Analytics,
value: true,
},
],
}
export const CookiePreferencesManager = ({
initialState = defaultState,
}: {
initialState: State
}) => {
const [state, dispatch] = useReducer(reducer, initialState)
// Reset state
useEffect(() => {
if (arePreferencesOutdated(state.date, POLICY_DATE)) {
dispatch({ type: Action.Reset })
}
}, [state.date])
// Commit state
useEffect(() => {
if (state.date) {
Cookies.set(COOKIE_NAME, serializeState(state), {
expires: 365 * 3,
})
}
}, [state])
return (
<div data-test-policy-date={POLICY_DATE} className="cookie-manager">
<CookieNotice
accepted={!!state.date}
outdated={arePreferencesOutdated(state.date, POLICY_DATE)}
dispatch={dispatch}
/>
<CookiePreferences
preferences={state.preferences}
date={state.date}
dispatch={dispatch}
/>
</div>
)
}
const reducer = (
state: State,
{ type: actionType, payload }: { type: Action; payload?: any }
): State => {
switch (actionType) {
case Action.Accept: {
return {
date: payload.date,
preferences: updatePreference(
PreferenceType.Analytics,
true,
state.preferences
),
}
}
case Action.TogglePreference:
return {
date: payload.date,
preferences: updatePreference(
payload.preferenceType,
!getPreferenceValue(
payload.preferenceType,
state.preferences
),
state.preferences
),
}
case Action.Reset:
return defaultState
default:
return state
}
}
const getInitialState = (): State => {
return parseRawCookieValue(Cookies.get(COOKIE_NAME)) ?? defaultState
}
export const parseRawCookieValue = (cookieValue?: string) => {
if (!cookieValue) return
const [preferencesRaw, dateRaw] = cookieValue.split(DATE_SEPARATOR)
const date = parseDate(dateRaw)
if (!date) return
const preferences = parsePreferences(preferencesRaw)
if (!preferences.length) return
return {
preferences,
date,
}
}
export const parsePreferences = (preferences?: string): Preference[] => {
if (!preferences) return []
return preferences
.split(PREFERENCES_SEPARATOR)
.map((preference) => {
const [type, , value] = preference // only supports 1 digit values
return {
type: type as PreferenceType,
value: value === "1",
}
})
.filter((preference) => isValidPreference(preference))
}
export const isValidPreference = ({ type, value }: Preference) => {
return (
Object.values(PreferenceType).includes(type as PreferenceType) &&
typeof value === "boolean"
)
}
export const parseDate = (date?: string): number | undefined => {
if (!date) return
return moment(date, DATE_FORMAT, true).isValid()
? parseInt(date, 10)
: undefined
}
export const getPreferenceValue = (
type: PreferenceType,
preferences: Preference[]
) => {
return (
preferences.find((preference) => {
return preference.type === type
})?.value ?? false
)
}
export const updatePreference = (
type: PreferenceType,
value: boolean,
preferences: Preference[]
) => {
return preferences.map((preference) => {
if (preference.type !== type) return preference
return {
...preference,
value,
}
})
}
export const arePreferencesOutdated = (
preferencesDate: number | undefined,
policyDate: number
) => {
if (!preferencesDate) return false
return preferencesDate < policyDate
}
export const serializeState = (state: State) => {
const serializedPreferences = state.preferences
.map((preference) => {
return `${preference.type}${PREFERENCE_KEY_VALUE_SEPARATOR}${
preference.value ? 1 : 0
}`
})
.join(PREFERENCES_SEPARATOR)
return `${serializedPreferences}${DATE_SEPARATOR}${state.date}`
}
export const getTodayDate = () => moment().format(DATE_FORMAT)
export const runCookiePreferencesManager = () => {
const div = document.createElement("div")
document.body.appendChild(div)
ReactDOM.render(
<CookiePreferencesManager initialState={getInitialState()} />,
div
)
}
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