Help with connecting to WeatherKit REST API (Java)

Question

Created Jul ’22

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I've been working on this for weeks to no avail; the best I've gotten so far is a 403 error, and I haven't been able to track down a fully-fleshed example in either Java or Kotlin.

First, after generating privateKey, here's my code to create a JWTS token. It seems to create one, but can someone please check if there's anything missing or wrong or unneccessary?

token = Jwts.builder()
        .setSubject    ("com.mycompany.myproject")
        .setId         ("QXXXXXXXXX.com.mycompany.myproject")
        .setHeaderParam("alg", "ES256")
        .setHeaderParam("kid", "CXXXXXXXXX")
        .setHeaderParam("id", "QXXXXXXXXX.com.mycompany.myproject")
        .setIssuedAt   (dateNow)
        .setExpiration (dateExpires)
        .claim("iss", "QXXXXXXXXX")
        .claim("iat", timeNow)      // same as dateNow, but in ms
        .claim("exp", timeExpires)  // same as dateExpires, but in ms
        .claim("sub", "com.mycompany.myproject")
        .signWith      (privateKey, SignatureAlgorithm.ES256)
        .compact();

With that in place, I'm creating the connection as follows. Although I've called URLs before, this is the first time I've attempted an authenticated connection, and there are a lot of moving parts.

URL url                = new URL("https://weatherkit.apple.com/api/v1/weather/en/40.5/-73.5?dataSets=currentWeather&timezone=Europe/London");

HttpURLConnection conn = null;
conn = (HttpURLConnection) url.openConnection()
conn.setRequestMethod   ("GET");
conn.setRequestProperty ("Authorization", "Bearer "+ token);
conn.setRequestProperty ("Content-Type", "application/x-www-form-urlencoded");
conn.setRequestProperty ("Content-Language", "en-US");
conn.setUseCaches       (false);
conn.setDoInput         (true);
conn.setDoOutput        (true);
conn.setConnectTimeout  (30000); //set timeout to 30 seconds

Executing conn.connect() churns for a little while and then returns a 403 error.

Any help from someone who's done this successfully is greatly appreciated.

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Answer 1

NickEs OP

Jul ’22

Per a suggestion, I decoded the resulting token using https://jwt.io/ and received the following:

HEADER: { "alg": "ES256", "kid": "CXXXXXXXXX", "id": "QXXXXXXXXX.com.mycompany.myproject" }

PAYLOAD: { "sub": "com.mycompany.myproject", "jti": "QXXXXXXXXX.com.mycompany.myproject", "iat": 1658508182203, "exp": 1658508212203, "iss": "QXXXXXXXXX" }

VERIFY SIGNATURE: Invalid signature

(Note, in both this and the original post, I've obfuscated the Apple-issued Team ID and Service ID)

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Answer 2

NickEs OP

Jul ’22

In light of the "Invalid signature" result from jwt.io as mentioned above, here is how I'm generating the private key (the .p8 file is in an /assets directory, with its headers stripped)

AssetManager assetManager   = this.getAssets();
InputStream stream          = assetManager.open("PRIVATE_KEY_FILE.p8");

byte[] bytes                = new byte[stream.available()];
int bytesRead               = stream.read(bytes);    // equals 200

byte[] pkcs8EncodedKey      = new byte[0];
pkcs8EncodedKey             = Base64.getDecoder().decode(bytes);

KeyFactory factory          = KeyFactory.getInstance("EC");
PrivateKey privateKey       = factory.generatePrivate(new PKCS8EncodedKeySpec(pkcs8EncodedKey));

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