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(Objective-C) 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 Objective-C Library Downloads

MAC OS X (Cocoa) Libs

iOS Libs

#import <CkoSocket.h>
#import <NSString.h>
#import <CkoRest.h>
#import <CkoPfx.h>
#import <CkoPrivateKey.h>
#import <CkoOAuth1.h>
#import <CkoStringBuilder.h>
#import <CkoXml.h>

// This example requires Chilkat v9.5.0.64 or later

CkoSocket *tunnel = [[CkoSocket alloc] init];

NSString *sshHostname = @"sftp.example.com";
int sshPort = 22;

// Connect to an SSH server and establish the SSH tunnel:
BOOL success = [tunnel SshOpenTunnel: sshHostname sshPort: [NSNumber numberWithInt: sshPort]];
if (success != YES) {
    NSLog(@"%@",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 != YES) {
    NSLog(@"%@",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.
CkoRest *rest = [[CkoRest alloc] init];
CkoSocket *channel = 0;

BOOL bTls = YES;
int port = 443;
int maxWaitMs = 7000;

// This returns a socket object that is a single channel within the SSH tunnel.
channel = [tunnel SshOpenChannel: @"api.xero.com" port: [NSNumber numberWithInt: port] ssl: bTls maxWaitMs: [NSNumber numberWithInt: maxWaitMs]];
if (tunnel.LastMethodSuccess != YES) {
    NSLog(@"%@",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: YES];
if (success != YES) {
    NSLog(@"%@",rest.LastErrorText);

    return;
}

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

NSString *consumerKey = @"XERO_PRIVATE_APP_KEY";
NSString *consumerSecret = @"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.
CkoPfx *pfx = [[CkoPfx alloc] init];
success = [pfx LoadPfxFile: @"qa_data/certs/xero_private_app/public_privatekey.pfx" password: @"PFX_PASSWORD"];
if (success != YES) {
    NSLog(@"%@",pfx.LastErrorText);
    return;
}

CkoPrivateKey *privKeyFromPfx = [pfx GetPrivateKey: [NSNumber numberWithInt: 0]];
if (pfx.LastMethodSuccess != YES) {
    NSLog(@"%@",pfx.LastErrorText);
    return;
}

// Or we can load from a PEM..
CkoPrivateKey *privKeyFromPem = [[CkoPrivateKey alloc] init];
success = [privKeyFromPem LoadPemFile: @"qa_data/certs/xero_private_app/privatekey.pem"];
if (success != YES) {
    NSLog(@"%@",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).

CkoOAuth1 *oauth1 = [[CkoOAuth1 alloc] init];
oauth1.ConsumerKey = consumerKey;
oauth1.ConsumerSecret = consumerSecret;
oauth1.Token = consumerKey;
oauth1.TokenSecret = consumerSecret;
oauth1.SignatureMethod = @"RSA-SHA1";
[oauth1 SetRsaKey: privKeyFromPfx];

// Install the OAuth1 authenticator.
[rest SetAuthOAuth1: oauth1 useQueryParams: NO];

NSLog(@"%@",@"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.
CkoStringBuilder *sbXml = [[CkoStringBuilder alloc] init];
success = [rest FullRequestNoBodySb: @"GET" uriPath: @"/api.xro/2.0/Contacts" sb: sbXml];
if (success != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

// A 200 response is expected for actual success.
if ([rest.ResponseStatusCode intValue] != 200) {
    NSLog(@"%@",[sbXml GetAsString]);
    return;
}

// Iterate over the contacts..
BOOL bAutoTrim = NO;
CkoXml *xml = [[CkoXml alloc] init];
[xml LoadSb: sbXml autoTrim: bAutoTrim];
[xml SaveXml: @"qa_cache/xero_contacts.xml"];

// How many records exist?
int recordCount = [[xml NumChildrenAt: @"Contacts"] intValue];
NSLog(@"%@%d",@"numRecords = ",recordCount);

int i = 0;
while (i < recordCount) {
    xml.I = [NSNumber numberWithInt: i];
    NSLog(@"%@%@",@"ContactID: ",[xml GetChildContent: @"Contacts|Contact[i]|ContactID"]);
    i = i + 1;
}
 

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