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import React from 'react'
import EventEmitter from 'eventemitter3'
import {networkRetry} from '#/lib/async/retry'
import {logger} from '#/logger'
import {type Device, device} from '#/storage'
const events = new EventEmitter()
const EVENT = 'geolocation-updated'
const emitGeolocationUpdate = (geolocation: Device['geolocation']) => {
events.emit(EVENT, geolocation)
}
const onGeolocationUpdate = (
listener: (geolocation: Device['geolocation']) => void,
) => {
events.on(EVENT, listener)
return () => {
events.off(EVENT, listener)
}
}
/**
* Default geolocation value. IF undefined, we fail closed and apply all
* additional mod authorities.
*/
export const DEFAULT_GEOLOCATION: Device['geolocation'] = {
countryCode: undefined,
isAgeRestrictedGeo: false,
}
async function getGeolocation(): Promise<Device['geolocation']> {
const res = await fetch(`https://bsky.app/ipcc`)
if (!res.ok) {
throw new Error(`geolocation: lookup failed ${res.status}`)
}
const json = await res.json()
if (json.countryCode) {
return {
countryCode: json.countryCode,
isAgeRestrictedGeo: json.isAgeRestrictedGeo ?? false,
}
} else {
return undefined
}
}
/**
* Local promise used within this file only.
*/
let geolocationResolution: Promise<{success: boolean}> | undefined
/**
* Begin the process of resolving geolocation. This should be called once at
* app start.
*
* THIS METHOD SHOULD NEVER THROW.
*
* This method is otherwise not used for any purpose. To ensure geolocation is
* resolved, use {@link ensureGeolocationResolved}
*/
export function beginResolveGeolocation() {
/**
* In dev, IP server is unavailable, so we just set the default geolocation
* and fail closed.
*/
if (__DEV__) {
geolocationResolution = new Promise(y => y({success: true}))
if (!device.get(['geolocation'])) {
device.set(['geolocation'], DEFAULT_GEOLOCATION)
}
return
}
geolocationResolution = new Promise(async resolve => {
let success = true
try {
// Try once, fail fast
const geolocation = await getGeolocation()
if (geolocation) {
device.set(['geolocation'], geolocation)
emitGeolocationUpdate(geolocation)
logger.debug(`geolocation: success`, {geolocation})
} else {
// endpoint should throw on all failures, this is insurance
throw new Error(`geolocation: nothing returned from initial request`)
}
} catch (e: any) {
success = false
logger.debug(`geolocation: failed initial request`, {
safeMessage: e.message,
})
// set to default
device.set(['geolocation'], DEFAULT_GEOLOCATION)
// retry 3 times, but don't await, proceed with default
networkRetry(3, getGeolocation)
.then(geolocation => {
if (geolocation) {
device.set(['geolocation'], geolocation)
emitGeolocationUpdate(geolocation)
logger.debug(`geolocation: success`, {geolocation})
success = true
} else {
// endpoint should throw on all failures, this is insurance
throw new Error(`geolocation: nothing returned from retries`)
}
})
.catch((e: any) => {
// complete fail closed
logger.debug(`geolocation: failed retries`, {safeMessage: e.message})
})
} finally {
resolve({success})
}
})
}
/**
* Ensure that geolocation has been resolved, or at the very least attempted
* once. Subsequent retries will not be captured by this `await`. Those will be
* reported via {@link events}.
*/
export async function ensureGeolocationResolved() {
if (!geolocationResolution) {
throw new Error(`geolocation: beginResolveGeolocation not called yet`)
}
const cached = device.get(['geolocation'])
if (cached) {
logger.debug(`geolocation: using cache`, {cached})
} else {
logger.debug(`geolocation: no cache`)
const {success} = await geolocationResolution
if (success) {
logger.debug(`geolocation: resolved`, {
resolved: device.get(['geolocation']),
})
} else {
logger.error(`geolocation: failed to resolve`)
}
}
}
type Context = {
geolocation: Device['geolocation']
}
const context = React.createContext<Context>({
geolocation: DEFAULT_GEOLOCATION,
})
context.displayName = 'GeolocationContext'
export function Provider({children}: {children: React.ReactNode}) {
const [geolocation, setGeolocation] = React.useState(() => {
const initial = device.get(['geolocation']) || DEFAULT_GEOLOCATION
return initial
})
React.useEffect(() => {
return onGeolocationUpdate(geolocation => {
setGeolocation(geolocation!)
})
}, [])
const ctx = React.useMemo(() => {
return {
geolocation,
}
}, [geolocation])
return <context.Provider value={ctx}>{children}</context.Provider>
}
export function useGeolocation() {
return React.useContext(context)
}
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