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(Swift 3,4,5...) Decode Microsoft Graph ID Token

Demonstrates how to decode a Microsoft Graph ID token.

Chilkat Downloads for the Swift Programming Language

MAC OS X (Cocoa) Objective-C/Swift Libs

iOS Objective-C/Swift Libs

func chilkatTest() {
    // 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"
    // }

    let jsonToken = CkoJsonObject()!
    var success: Bool = jsonToken.loadFile("qa_data/tokens/microsoftGraph.json")
    if success == false {
        print("Failed to load the JSON file...")
        return
    }

    // Use Chilkat's JWT API to examine the id_token..
    let jwt = CkoJwt()!
    var idToken: String? = jsonToken.string(of: "id_token")

    // Extract the JOSE header..
    var jose: String? = jwt.getHeader(idToken)

    let jsonHeader = CkoJsonObject()!
    jsonHeader.load(jose)
    jsonHeader.emitCompact = false
    print("\(jsonHeader.emit()!)")

    // The JOSE header looks like this:

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

    var claims: String? = jwt.getPayload(idToken)

    let jsonClaims = CkoJsonObject()!
    jsonClaims.load(claims)
    jsonClaims.emitCompact = false
    print("\(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..
    var ver: String? = jsonClaims.string(of: "ver")
    var iss: String? = jsonClaims.string(of: "iss")
    var sub: String? = jsonClaims.string(of: "sub")
    var aud: String? = jsonClaims.string(of: "aud")
    var exp: Int = jsonClaims.int(of: "exp").intValue
    var iat: Int = jsonClaims.int(of: "iat").intValue
    var nbf: Int = jsonClaims.int(of: "nbf").intValue
    var name: String? = jsonClaims.string(of: "name")
    var preferred_username: String? = jsonClaims.string(of: "preferred_username")
    var oid: String? = jsonClaims.string(of: "oid")
    var tid: String? = jsonClaims.string(of: "tid")
    var aio: String? = jsonClaims.string(of: "aio")

}

 

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