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import { NotFound, Timeout } from './custom-erros'
import AbortController from 'abort-controller'
import {
TheTvDbShow,
TheTvDbShowEpisode,
TheTvDbShowEpisodePage,
TheTvDbUpdatedShowId,
TheTvDbEpisode,
TheTvDbShowImage
} from './types'
const noop: (msg: string) => void = () => undefined
const logWrapper = (log: (msg: string) => void, msg: string) => <T>(
val: T
): T => {
log(msg)
return val
}
interface Options {
/**
First timeout
*/
timeout?: number
/**
Canculate next timeout if the first timeout was met.
@example
const defaultNextTimeout = (currentTimeout: number) => {
if (currentTimeout > 10000) {
return null // Throw an timeout error
}
return currentTimeout + 1000 // timeout for the next try
}
*/
nextTimeout?: (currentTimeout: number) => number | null
/**
* Custom fetch function
*/
fetch?: typeof fetch
}
export class TheTvDb {
private apikey: string
private fetch: typeof fetch
private options: Required<Omit<Options, 'fetch'>>
jwt: Promise<string> | undefined = undefined
constructor(apikey: string, options?: Options) {
this.apikey = apikey
this.fetch = options?.fetch || fetch
const defaultNextTimeout = (currentTimeout: number) => {
if (currentTimeout > 4000) {
return null
}
return currentTimeout + 1000
}
this.options = {
timeout: options?.timeout || 2000,
nextTimeout: options?.nextTimeout || defaultNextTimeout
}
}
get token() {
if (!this.jwt) {
this.jwt = this.fetchToken()
}
return this.jwt
}
fetchShow(theTvDbId: number, log = noop): Promise<TheTvDbShow> {
return this.get('https://api.thetvdb.com/series/' + theTvDbId, log)
.then(handelHttpError)
.then(res => res.json())
.then(logWrapper(log, `Done, getting back`))
.then(res => res.data)
}
async fetchShowEpisodes(
theTvDbId: number,
log = noop
): Promise<TheTvDbShowEpisode[]> {
let episodes: TheTvDbShowEpisode[] = []
let nextPageToLoad = 1;
while (nextPageToLoad) {
const response = await this.fetchEpisodePage(
theTvDbId,
nextPageToLoad,
log
)
nextPageToLoad = response.links?.next;
episodes = [ ...episodes, ...response.data ];
}
return episodes;
}
/**
* Fetch the latest episodes.
* Will return somewhere between 0 and numberOfEpisodes + 99 episodes
*/
async fetchLatestShowEpisodes(
theTvDbId: number,
numberOfEpisodes: number,
log = noop
) {
const response = await this.fetchEpisodePage(
theTvDbId,
1,
log
)
const lastPage = response.links?.last || 1;
if (lastPage === 1) {
return response.data
} else if (lastPage === 2) {
const result = await this.fetchEpisodePage(
theTvDbId,
2,
log
)
return [...response.data, ...result.data]
}
let nextPageToLoad = lastPage;
let episodes: TheTvDbShowEpisode[] = []
while (episodes.length < numberOfEpisodes && nextPageToLoad) {
const result = await this.fetchEpisodePage(
theTvDbId,
nextPageToLoad,
log
)
episodes = [...result.data, ...episodes];
nextPageToLoad = result.links.prev;
}
return episodes;
}
fetchLastUpdateShowsList(
lastUpdate: number,
log = noop
): Promise<TheTvDbUpdatedShowId[]> {
return this.get(
'https://api.thetvdb.com/updated/query?fromTime=' + lastUpdate,
log
)
.then(handelHttpError)
.then(res => res.json())
.then(res => res.data)
.then(data => ensureArray(data))
}
fetchEpisodeImage(episodeId: number, log = noop): Promise<Buffer> {
return this.get('https://api.thetvdb.com/episodes/' + episodeId, log)
.then(handelHttpError)
.then(res => res.json())
.then(res => res.data)
.then((episode: TheTvDbEpisode) => episode.filename)
.then(rejectIfNot(new NotFound()))
.then(filename => this.fetchImage(filename, log))
}
fetchShowPoster(showId: number, log = noop): Promise<Buffer> {
return this.get(
`https://api.thetvdb.com/series/${showId}/images/query?keyType=poster`,
log
)
.then(handelHttpError)
.then(res => res.json())
.then(res => res.data)
.then(getHigestRating)
.then(rejectIfNot(new NotFound()))
.then(image => image.fileName)
.then(filename => this.fetchImage(filename, log))
}
fetchShowFanart(showId: number, log = noop): Promise<Buffer> {
return this.get(
`https://api.thetvdb.com/series/${showId}/images/query?keyType=fanart`,
log
)
.then(handelHttpError)
.then(res => res.json())
.then(res => res.data)
.then(getHigestRating)
.then(rejectIfNot(new NotFound()))
.then(image => image.fileName)
.then(filename => this.fetchImage(filename, log))
}
private fetchEpisodePage(theTvDbId: number, page: number, log = noop): Promise<TheTvDbShowEpisodePage> {
return this.get(
`https://api.thetvdb.com/series/${theTvDbId}/episodes?page=${page}`,
log
)
.then(res => {
// The tv db API has a bug where the next page can give a 404
if (res.status === 404) {
return {
data: [],
links: {} as any
} as TheTvDbShowEpisodePage
}
handelHttpError(res)
return res.json()
})
.then(res => {
return {
data: ensureArray(res.data),
links: res.links
}
})
.then(logWrapper(log, `Done, getting back`))
}
private fetchImage(filename: string, log: typeof noop): Promise<Buffer> {
log(`Making request to: 'https://www.thetvdb.com/banners/${filename}'`)
return this.fetch('https://www.thetvdb.com/banners/' + filename)
.then(handelHttpError)
.then(logWrapper(log, 'Parse the response as a buffer'))
.then(response => response.buffer())
.then(logWrapper(log, 'Done and done'))
}
private async get(
url: string,
log: typeof noop,
timeout = this.options.timeout
): Promise<Response> {
log('Making request to ' + url)
const token = await this.token
const controller = new AbortController()
const timeoutId = setTimeout(() => controller.abort(), timeout)
try {
const result = await this.fetch(url, {
method: 'GET',
headers: { Authorization: 'Bearer ' + token },
signal: controller.signal
} as any) // The current type to not accept signal
clearTimeout(timeoutId)
log('We got a result from ' + url)
return result
} catch (error) {
clearTimeout(timeoutId)
if (error.name === 'AbortError') {
log(`Did not recive any reposne within ${timeout} ms. url: ` + url)
const nextTimeout = this.options.nextTimeout(timeout)
if (!nextTimeout) {
log(`Giving up. url: ` + url)
throw new Timeout(`Timeout after ${timeout} ms for url: ${url}`)
}
return this.get(url, log, nextTimeout)
}
if (error) {
log(
`Could not get any respone. ${error.name} ${error.message}. url: ` +
url
)
} else {
log(`Could not get any respone. url: ` + url)
}
throw error
}
}
private fetchToken(): Promise<string> {
return this.fetch('https://api.thetvdb.com/login', {
method: 'POST',
body: JSON.stringify({
apikey: this.apikey
}),
headers: { 'Content-Type': 'application/json' }
})
.then(handelHttpError)
.then(res => res.json())
.then(result => result.token)
}
}
export function getHigestRating(images: TheTvDbShowImage[]): TheTvDbShowImage {
return ensureArray(images).reduce((acc, image) => {
if (image.ratingsInfo.average > acc.ratingsInfo.average) {
return image
} else {
return acc
}
}, images[0])
}
export function handelHttpError(res: Response) {
if (res.status === 404) {
throw new NotFound()
}
if (!res.ok) {
throw new Error('Unable to make the http request: ' + res.statusText)
}
return res
}
export function ensureArray<T = any>(data: T[]): T[] {
if (Array.isArray(data)) {
return data
}
return []
}
function rejectIfNot(error: Error) {
return <T>(val: T): Promise<T> =>
val ? Promise.resolve(val) : Promise.reject(error)
}
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