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Swift 3,4,5... Web API Examples

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(Swift 3,4,5...) Xero API through an SSH Tunnel

This example demonstrates connecting through an SSH Tunnel w/ 2-legged OAuth for a Xero private application.

This example requires Chilkat v9.5.0.64 or later

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 Chilkat v9.5.0.64 or later

    let tunnel = CkoSocket()!

    var sshHostname: String? = "sftp.example.com"
    var sshPort: Int = 22

    // Connect to an SSH server and establish the SSH tunnel:
    var success: Bool = tunnel.sshOpenTunnel(sshHostname, sshPort: sshPort)
    if success != true {
        print("\(tunnel.lastErrorText!)")
        return
    }

    // Authenticate with the SSH server via a login/password
    // or with a public key.
    // This example demonstrates SSH password authentication.
    success = tunnel.sshAuthenticatePw("mySshLogin", sshPassword: "mySshPassword")
    if success != true {
        print("\(tunnel.lastErrorText!)")
        return
    }

    //  OK, the SSH tunnel is setup.  Now open a channel within the tunnel.
    //  (Any number of channels may be created from the same SSH tunnel.
    //  Multiple channels may coexist at the same time.)

    // This sample code would typically be placed in a subroutine or function
    // where the rest object is passed by reference.
    // It does the OAuth1 setup and makes the initial connection.
    let rest = CkoRest()!
    var channel: CkoSocket?

    var bTls: Bool = true
    var port: Int = 443
    var maxWaitMs: Int = 7000

    // This returns a socket object that is a single channel within the SSH tunnel.
    channel = tunnel.sshOpenChannel("api.xero.com", port: port, ssl: bTls, maxWaitMs: maxWaitMs)
    if tunnel.lastMethodSuccess != true {
        print("\(tunnel.lastErrorText!)")
        return
    }

    // Use the connection.  (This connection is a TLS running on an SSH channel through an SSH tunnel.
    // In other words, TLS is wrapped within the SSH tunnel.)
    success = rest.useConnection(channel, autoReconnect: true)
    if success != true {
        print("\(rest.lastErrorText!)")
        channel = nil
        return
    }

    // OK, we're connected.  
    // -----------------------------------------------------------------
    // Now setup the OAuth1 authenticator..

    var consumerKey: String? = "XERO_PRIVATE_APP_KEY"
    var consumerSecret: String? = "XERO_PRIVATE_APP_SECRET"

    // Let's get our private key from our PFX (password protected), or the PEM (unprotected).
    // You can decide which to use.  Either is OK, although I would recommend keeping your
    // private keys in a PFX and not in an unprotected PEM.
    let pfx = CkoPfx()!
    success = pfx.loadFile("qa_data/certs/xero_private_app/public_privatekey.pfx", password: "PFX_PASSWORD")
    if success != true {
        print("\(pfx.lastErrorText!)")
        return
    }

    var privKeyFromPfx: CkoPrivateKey? = pfx.getPrivateKey(0)
    if pfx.lastMethodSuccess != true {
        print("\(pfx.lastErrorText!)")
        return
    }

    // Or we can load from a PEM..
    let privKeyFromPem = CkoPrivateKey()!
    success = privKeyFromPem.loadPemFile("qa_data/certs/xero_private_app/privatekey.pem")
    if success != true {
        print("\(privKeyFromPem.lastErrorText!)")
        return
    }

    // Note: There are many other means for loading a private key, including
    // from other formats and directly from memory (i.e. not file-based).

    let oauth1 = CkoOAuth1()!
    oauth1.consumerKey = consumerKey
    oauth1.consumerSecret = consumerSecret
    oauth1.token = consumerKey
    oauth1.tokenSecret = consumerSecret
    oauth1.signatureMethod = "RSA-SHA1"
    oauth1.setRsaKey(privKeyFromPfx)
    privKeyFromPfx = nil

    // Install the OAuth1 authenticator.
    rest.setAuthOAuth1(oauth1, useQueryParams: false)

    print("OK, the Xero OAuth1 is initialized and the REST object is ready to make REST API calls..")

    // -----------------------------------------------------------------
    // Make a call to verify that OAuth1 through an HTTP proxy works..

    // Get the full list of contacts.
    let sbXml = CkoStringBuilder()!
    success = rest.fullRequestNoBodySb("GET", uriPath: "/api.xro/2.0/Contacts", sb: sbXml)
    if success != true {
        print("\(rest.lastErrorText!)")
        return
    }

    // A 200 response is expected for actual success.
    if rest.responseStatusCode.intValue != 200 {
        print("\(sbXml.getAsString()!)")
        return
    }

    // Iterate over the contacts..
    var bAutoTrim: Bool = false
    let xml = CkoXml()!
    xml.loadSb(sbXml, autoTrim: bAutoTrim)
    xml.save("qa_cache/xero_contacts.xml")

    // How many records exist?
    var recordCount: Int = xml.numChildren(at: "Contacts").intValue
    print("numRecords = \(recordCount)")

    var i: Int = 0
    while i < recordCount {
        xml.i = i
        print("ContactID: \(xml.getChildContent("Contacts|Contact[i]|ContactID")!)")
        i = i + 1
    }


}

 

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