(Go) Decode Microsoft Graph ID Token

Demonstrates how to decode a Microsoft Graph ID token.

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    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // In a previous example, we obtained a Microsoft Graph OAuth2 access token.
    // This example loads the JSON saved from the previous example and decodes the id_token.

    // Our Microsoft Graph OAuth2 token looks like this:

    // {
    //   "token_type": "Bearer",
    //   "scope": "openid profile User.ReadWrite Mail.ReadWrite Mail.Send Files.ReadWrite User.Read Calendars.ReadWrite Group.ReadWrite.All",
    //   "expires_in": 3600,
    //   "ext_expires_in": 3600,
    //   "access_token": "EwCQA8l6...0HhMKYwC",
    //   "refresh_token": "MCWulIvzi2yD0S...igEFn51mqcByhZtAJg",
    //   "id_token": "eyJ0eXAiOiJKV1...Q7lRDaR-7A",
    //   "expires_on": "1562862714"
    // }

    jsonToken := chilkat.NewJsonObject()
    success := jsonToken.LoadFile("qa_data/tokens/microsoftGraph.json")
    if success == false {
        fmt.Println("Failed to load the JSON file...")
        jsonToken.DisposeJsonObject()
        return
    }

    // Use Chilkat's JWT API to examine the id_token..
    jwt := chilkat.NewJwt()
    idToken := jsonToken.StringOf("id_token")

    // Extract the JOSE header..
    jose := jwt.GetHeader(*idToken)

    jsonHeader := chilkat.NewJsonObject()
    jsonHeader.Load(*jose)
    jsonHeader.SetEmitCompact(false)
    fmt.Println(*jsonHeader.Emit())

    // The JOSE header looks like this:

    // {
    //   "typ": "JWT",
    //   "alg": "RS256",
    //   "kid": "1LTMzakihiRla_8z2BEJVXeWMqo"
    // }

    claims := jwt.GetPayload(*idToken)

    jsonClaims := chilkat.NewJsonObject()
    jsonClaims.Load(*claims)
    jsonClaims.SetEmitCompact(false)
    fmt.Println(*jsonClaims.Emit())

    // The claims look like this:

    // {
    //   "ver": "2.0",
    //   "iss": "https://login.microsoftonline.com/9188040d-6c67-4c5b-b112-36a304b66dad/v2.0",
    //   "sub": "AAAAAAAAAAAAAAAAAAAAAHJFryd6Gydo-XtTd1nhUNQ",
    //   "aud": "18c456bd-db75-43fe-9724-9e5d821c68ff",
    //   "exp": 1562945513,
    //   "iat": 1562858813,
    //   "nbf": 1562858813,
    //   "name": "Matt Chilkat",
    //   "preferred_username": "matt@example.com",
    //   "oid": "00000000-0000-0000-3a33-fceb9b74cc15",
    //   "tid": "9188040d-6c67-4c5b-b112-36a304b66dad",
    //   "aio": "DfibJqKnWC1c0FS6G ... W6pvTrQuYzyq16ghY$"
    // }
    // 

    // Use this online tool to generate parsing code from sample JSON: 
    // Generate Parsing Code from JSON

    // Get each of the claims..
    ver := jsonClaims.StringOf("ver")
    iss := jsonClaims.StringOf("iss")
    s_sub := jsonClaims.StringOf("sub")
    aud := jsonClaims.StringOf("aud")
    exp := jsonClaims.IntOf("exp")
    iat := jsonClaims.IntOf("iat")
    nbf := jsonClaims.IntOf("nbf")
    name := jsonClaims.StringOf("name")
    preferred_username := jsonClaims.StringOf("preferred_username")
    oid := jsonClaims.StringOf("oid")
    tid := jsonClaims.StringOf("tid")
    aio := jsonClaims.StringOf("aio")

    jsonToken.DisposeJsonObject()
    jwt.DisposeJwt()
    jsonHeader.DisposeJsonObject()
    jsonClaims.DisposeJsonObject()