Apple WeatherKit REST API Netlify Function

weather.js

const axios = require("axios")
const jwt = require("jsonwebtoken")

const handler = async (event) => {
  try {
    // Decode private key
    const privateKey = Buffer.from(process.env.WEATHERKIT_KEY, 'base64').toString()
    
    // Get team, key, and app id
    const teamId = process.env.WEATHERKIT_TEAM_ID
    const keyId = process.env.WEATHERKIT_KEY_ID
    const appId = process.env.WEATHERKIT_APP_ID    

    // Sign jwt token
    const jwtToken = jwt.sign({}, privateKey, {
      jwtid: `${teamId}.${appId}`,
      issuer: teamId,
      expiresIn: "1h",
      subject: appId,
      header: {
        alg: "ES256",
        kid: keyId,
        id: `${teamId}.${appId}`
      }
    })
    
    // Get coordinates from parameters
    const latitude = event.queryStringParameters.latitude || 29.951065
    const longitude = event.queryStringParameters.longitude || -90.071533
    
    // Get current weather from WeatherKit
    const { data } = await axios.get(`https://weatherkit.apple.com/api/v1/weather/en/${latitude}/${longitude}?dataSets=currentWeather&timezone=US/Pacific&countryCode=us`, {
      headers: {
        "Authorization": `Bearer ${jwtToken}`
      }
    })

    // Return weather
    return {
      statusCode: 200,
      body: JSON.stringify(data)
    }

  } catch (error) {
    // Return error
    return {
      statusCode: 500,
      body: error.toString()
    }

  }
}

module.exports = { handler }