Swift

Get a Google People API OAuth2 Access Token

See more Google People Examples

Demonstrates how to get a Google People OAuth2 access token from a desktop application or script. Swift

func chilkatTest() {
    var success: Bool = false

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

    let oauth2 = CkoOAuth2()!

    // For Google OAuth2, set the ListenPort equal to the port specified in the authorized callback URI for the ClientID.
    // See http://cknotes.com/setup-google-account-for-google-drive-api-walkthrough/
    oauth2.listenPort = 3017

    oauth2.authorizationEndpoint = "https://accounts.google.com/o/oauth2/v2/auth"
    oauth2.tokenEndpoint = "https://www.googleapis.com/oauth2/v4/token"

    // Replace these with actual values.
    oauth2.clientId = "GOOGLE-CLIENT-ID"
    oauth2.clientSecret = "GOOGLE-CLIENT-SECRET"

    oauth2.codeChallenge = true
    oauth2.codeChallengeMethod = "S256"

    // See Google People API Scopes for more scopes.
    oauth2.scope = "profile https://www.googleapis.com/auth/contacts https://www.googleapis.com/auth/contacts.other.readonly https://www.googleapis.com/auth/directory.readonly"

    // Begin the OAuth2 three-legged flow.  This returns a URL that should be loaded in a browser.
    var url: String? = oauth2.startAuth()
    if oauth2.lastMethodSuccess == false {
        print("\(oauth2.lastErrorText!)")
        return
    }

    // Launch the system's default browser navigated to the URL.
    success = oauth2.launchBrowser(url: url)
    if success == false {
        print("\(oauth2.lastErrorText!)")
        return
    }

    // Now wait for the authorization.
    // We'll wait for a max of 30 seconds.
    var numMsWaited: Int = 0
    while (numMsWaited < 30000) && (oauth2.authFlowState.intValue < 3) {
        oauth2.sleepMs(millisec: 100)
        numMsWaited = numMsWaited + 100
    }

    // If there was no response from the browser within 30 seconds, then 
    // the AuthFlowState will be equal to 1 or 2.
    // 1: Waiting for Redirect. The OAuth2 background thread is waiting to receive the redirect HTTP request from the browser.
    // 2: Waiting for Final Response. The OAuth2 background thread is waiting for the final access token response.
    // In that case, cancel the background task started in the call to StartAuth.
    if oauth2.authFlowState.intValue < 3 {
        oauth2.cancel()
        print("No response from the browser!")
        return
    }

    // Check the AuthFlowState to see if authorization was granted, denied, or if some error occurred
    // The possible AuthFlowState values are:
    // 3: Completed with Success. The OAuth2 flow has completed, the background thread exited, and the successful JSON response is available in AccessTokenResponse property.
    // 4: Completed with Access Denied. The OAuth2 flow has completed, the background thread exited, and the error JSON is available in AccessTokenResponse property.
    // 5: Failed Prior to Completion. The OAuth2 flow failed to complete, the background thread exited, and the error information is available in the FailureInfo property.
    if oauth2.authFlowState.intValue == 5 {
        print("OAuth2 failed to complete.")
        print("\(oauth2.failureInfo!)")
        return
    }

    if oauth2.authFlowState.intValue == 4 {
        print("OAuth2 authorization was denied.")
        print("\(oauth2.accessTokenResponse!)")
        return
    }

    if oauth2.authFlowState.intValue != 3 {
        print("Unexpected AuthFlowState:\(oauth2.authFlowState.intValue)")
        return
    }

    // Save the full JSON access token response to a file.
    let sbJson = CkoStringBuilder()!
    sbJson.append(value: oauth2.accessTokenResponse)
    sbJson.writeFile(path: "qa_data/tokens/googlePeople.json", charset: "utf-8", emitBom: false)

    // The saved JSON response looks like this:

    // {
    //   "access_token": "ya29.a0AfH6S ... LAZYFUkf0",
    //   "expires_in": 3599,
    //   "refresh_token": "1//0fL_Ov ... ee0",
    //   "scope": "https://www.googleapis.com/auth/contacts",
    //   "token_type": "Bearer"
    // }

    print("OAuth2 authorization granted!")
    print("Access Token = \(oauth2.accessToken!)")

}