(Swift 3,4,5...) Docusign Refresh OAuth2 Access Token

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Demonstrates how to refresh a Docusign OAuth2 access token. The refresh does not require user interaction via a web browser. If an access token expires (typically with a 401 response code), a new access token can be automatically obtained by using the code in this example.

For more information, see https://developers.docusign.com/esign-rest-api/guides/authentication/oauth2-code-grant

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

    // It is assumed we previously obtained an OAuth2 access token.
    // This example loads the JSON access token file 
    // saved by this example: Get Docusign OAuth2 Access Token

    let jsonToken = CkoJsonObject()!
    var success: Bool = jsonToken.loadFile("qa_data/tokens/docusign.json")
    if success != true {
        print("Failed to load docusign.json")
        return
    }

    // The access token JSON looks like this:

    // {
    //   "access_token": "eyJ0eXA....YQyig",
    //   "token_type": "Bearer",
    //   "refresh_token": "eyJ0eXA....auE3eHKg",
    //   "expires_in": 28800
    // }

    let oauth2 = CkoOAuth2()!

    // For the developer sandbox environment, the token endpoint is https://account-d.docusign.com/oauth/token
    // For the production platform, the token endpoint is https://account.docusign.com/oauth/token
    oauth2.tokenEndpoint = "https://account-d.docusign.com/oauth/token"

    // Replace these with actual values.
    // The client ID is also known as the "integration key" in Docusign.
    oauth2.clientId = "MY_DOCUSIGN_CLIENT_ID"
    // This is your secret key for the authorization code grant.
    oauth2.clientSecret = "MY_DOCUSIGN_CLIENT_SECRET"

    // Get the "refresh_token"
    oauth2.refreshToken = jsonToken.string(of: "refresh_token")

    // Send the HTTP POST to refresh the access token..
    success = oauth2.refreshAccessToken()
    if success != true {
        print("\(oauth2.lastErrorText!)")
        return
    }

    print("New access token: \(oauth2.accessToken!)")
    print("New refresh token: \(oauth2.refreshToken!)")

    // Update the JSON with the new tokens.
    jsonToken.update("access_token", value: oauth2.accessToken)
    jsonToken.update("refresh_token", value: oauth2.refreshToken)

    // Save the new JSON access token response to a file.
    let sbJson = CkoStringBuilder()!
    jsonToken.emitCompact = false
    jsonToken.emitSb(sbJson)
    sbJson.writeFile("qa_data/tokens/docusign.json", charset: "utf-8", emitBom: false)

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

}