Create a Time-Off

//native

type Personio = {

	clientId: string

	clientSecret: string

}

/**

 * Create a Time-Off

 * Adds absence data for absence types with **time unit** set to **days**.

 */

export async function main(

	auth: Personio,

	body: {

		employee_id: number

		time_off_type_id: number

		start_date: string

		end_date: string

		half_day_start: false | true

		half_day_end: false | true

		comment?: string

		skip_approval?: false | true

	},

	X_Personio_Partner_ID?: string,

	X_Personio_App_ID?: string

) {

	const url = new URL(`https://api.personio.de/v1/company/time-offs`)

	const response = await fetch(url, {

		method: 'POST',

		headers: {

			...(X_Personio_Partner_ID ? { 'X-Personio-Partner-ID': X_Personio_Partner_ID } : {}),

			...(X_Personio_App_ID ? { 'X-Personio-App-ID': X_Personio_App_ID } : {}),

			'Content-Type': 'application/x-www-form-urlencoded',

			Authorization: 'Bearer ' + (await getOAuthToken(auth, 'https://api.personio.de/oauth2/token'))

		},

		body: new URLSearchParams(

			Object.entries(body).reduce((acc, [key, value]) => {

				acc[key] = String(value)

				return acc

			}, {} as Record<string, string>)

		)

	})

	if (!response.ok) {

		const text = await response.text()

		throw new Error(`${response.status} ${text}`)

	}

	return await response.json()

}

async function getOAuthToken(auth: Personio, tokenUrl: string): Promise<string> {

	const params = new URLSearchParams({

		grant_type: 'client_credentials',

		client_id: auth.clientId,

		client_secret: auth.clientSecret

	})

	const response = await fetch(tokenUrl, {

		method: 'POST',

		headers: {

			Authorization: 'Basic ' + btoa(`${auth.clientId}:${auth.clientSecret}`),

			'Content-Type': 'application/x-www-form-urlencoded'

		},

		body: params.toString()

	})

	if (!response.ok) {

		const text = await response.text()

		throw new Error(`OAuth token request failed: ${response.status} ${text}`)

	}

	const data = await response.json()

	return data.access_token

}