(Swift 2) Get a Google Drive Access Token using a JSON Private Key

Demonstrates how to get a Google Drive API access token using a JSON service account private key.

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.

    // First load the JSON key into a string.
    let fac = CkoFileAccess()
    var jsonKey: String? = fac.ReadEntireTextFile("qa_data/googleApi/chilkatcloud-b8826e030499.json", charset: "utf-8")
    if fac.LastMethodSuccess != true {
        print("\(fac.LastErrorText)")
        return
    }

    let gAuth = CkoAuthGoogle()
    gAuth.JsonKey = jsonKey

    // Choose a scope.
    gAuth.Scope = "https://www.googleapis.com/auth/drive"

    // Request an access token that is valid for this many seconds.
    gAuth.ExpireNumSeconds = 3600

    // If the application is requesting delegated access:
    // The email address of the user for which the application is requesting delegated access,
    // then set the email address here. (Otherwise leave it empty.)
    gAuth.SubEmailAddress = ""

    // Connect to www.googleapis.com using TLS (TLS 1.2 is the default.)
    // The Chilkat socket object is used so that the connection can be established
    // through proxies or an SSH tunnel if desired.
    let tlsSock = CkoSocket()
    var success: Bool = tlsSock.Connect("www.googleapis.com", port: 443, ssl: true, maxWaitMs: 5000)
    if success != true {
        print("\(tlsSock.LastErrorText)")
        return
    }

    // Send the request to obtain the access token.
    success = gAuth.ObtainAccessToken(tlsSock)
    if success != true {
        print("\(gAuth.LastErrorText)")
        return
    }

    // Examine the access token:
    print("Access Token: \(gAuth.AccessToken)")

}