(Swift 3,4,5...) Get Google API Access Token using P12 Service Account Key

Demonstrates how to get a Google API access token using a P12 service account 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 PKCS12 (.p12 / .pfx) into a PFX object.
    let pfx = CkoPfx()!
    var success: Bool = pfx.loadFile("qa_data/googleSvcAccountKeys/ChilkatCloud-6ba1b17d6d16.p12", password: "notasecret")
    if success != true {
        print("\(pfx.lastErrorText!)")
        return
    }

    let gAuth = CkoAuthGoogle()!
    success = gAuth.setP12(pfx)

    // Set the client email address.
    gAuth.emailAddress = "pip-563@chilkatcloud.iam.gserviceaccount.com"

    // Choose a scope.
    gAuth.scope = "https://www.googleapis.com/auth/cloud-platform"

    // 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()!
    success = 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!)")

}