(Swift 3,4,5...) citi Developer OAuth2 Client Credentials Grant

Get access token for your application credentials. You can use this for citi APIs which do not require customer credential verification and consent (e.g. Onboarding).

For more information, see https://sandbox.developerhub.citi.com/api/united-states/retail-bank/identity-security/authorize/documentation

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let http = CkoHttp()!
    var success: Bool

    // Implements the following CURL command:

    // curl --request POST \
    //   --url https://sandbox.apihub.citi.com/gcb/api/clientCredentials/oauth2/token/us/gcb \
    //   --header 'accept: application/json' \
    //   --user client-id:client-secret \
    //   --header 'content-type: application/x-www-form-urlencoded' \
    //   --data 'grant_type=client_credentials&scope=%2Fapi'

    http.login = "client-id"
    http.password = "client-secret"

    let req = CkoHttpRequest()!
    req.httpVerb = "POST"
    req.path = "/gcb/api/clientCredentials/oauth2/token/us/gcb"
    req.contentType = "application/x-www-form-urlencoded"
    req.addParam("grant_type", value: "client_credentials")
    req.addParam("scope", value: "/api")
    req.addHeader("accept", value: "application/json")

    var resp: CkoHttpResponse? = http.postUrlEncoded("https://sandbox.apihub.citi.com/gcb/api/clientCredentials/oauth2/token/us/gcb", req: req)
    if http.lastMethodSuccess == false {
        print("\(http.lastErrorText!)")
        return
    }

    let sbResponseBody = CkoStringBuilder()!
    resp!.getBodySb(sbResponseBody)
    let jResp = CkoJsonObject()!
    jResp.loadSb(sbResponseBody)
    jResp.emitCompact = false

    print("Response Body:")
    print("\(jResp.emit()!)")

    var respStatusCode: Int = resp!.statusCode.intValue
    print("Response Status Code = \(respStatusCode)")
    if respStatusCode >= 400 {
        print("Response Header:")
        print("\(resp!.header!)")
        print("Failed.")
        resp = nil
        return
    }

    resp = nil

    success = jResp.writeFile("qa_data/tokens/citi_client_credentials.json")
    if success == false {
        print("Failed to save JSON access token file.")
        return
    }

    //  Sample JSON response:
    //  (Sample code for parsing the JSON response is shown below)

    //  {
    //    "token_type": "bearer",
    //    "access_token": "AAIkMjdh ... 3fsWb7zJ0s",
    //    "expires_in": 1800,
    //    "consented_on": 1584817860,
    //    "scope": "/api"
    //  }

    //  Sample code for parsing the JSON response...
    //  Use the following online tool to generate parsing code from sample JSON:
    //  Generate Parsing Code from JSON

    var token_type: String? = jResp.string(of: "token_type")
    var access_token: String? = jResp.string(of: "access_token")
    var expires_in: Int = jResp.int(of: "expires_in").intValue
    var consented_on: Int = jResp.int(of: "consented_on").intValue
    var scope: String? = jResp.string(of: "scope")

}