(Objective-C) Xero Upload Attachment

Demonstrates how to upload an attachment to Xero.

For more information, see https://developer.xero.com/documentation/api/attachments#POST

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#import <CkoHttp.h>
#import <CkoJsonObject.h>
#import <NSString.h>
#import <CkoBinData.h>
#import <CkoHttpResponse.h>

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

CkoHttp *http = [[CkoHttp alloc] init];

// Important: Make sure your OAuth2 access token was obtained with the scope "accounting.attachments"
// included in the list of scopes.

CkoJsonObject *jsonToken = [[CkoJsonObject alloc] init];
BOOL success = [jsonToken LoadFile: @"qa_data/tokens/xero-access-token.json"];
if (success == NO) {
    NSLog(@"%@",jsonToken.LastErrorText);
    return;
}

http.AuthToken = [jsonToken StringOf: @"access_token"];

// Replace the value here with an actual tenant ID obtained from this example:
// Get Xero Tenant IDs
[http SetRequestHeader: @"Xero-tenant-id" value: @"83299b9e-5747-4a14-a18a-a6c94f824eb7"];

http.Accept = @"application/json";

NSString *url = @"https://api.xero.com/api.xro/2.0/{$Endpoint}/{$Guid}/Attachments/{$Filename}";

// Endpoint can be Invoices, Receipts, CreditNotes, PurchaseOrders, etc.
[http SetUrlVar: @"Endpoint" value: @"Invoices"];

// Guid is the ID of the item, such as the InvoiceID.
[http SetUrlVar: @"Guid" value: @"0032f627-3156-4d30-9b1c-4d3b994dc921"];

// Filename is the filename of the attachment you are uploading.
[http SetUrlVar: @"Filename" value: @"penguins.jpg"];

// Load the file to be uploaded (from the local filesystem).
CkoBinData *bd = [[CkoBinData alloc] init];
success = [bd LoadFile: @"qa_data/jpg/penguins.jpg"];
if (success == NO) {
    NSLog(@"%@",@"Failed to load attachment file.");
    return;
}

// Indicate the content-type according to the file content type.
// Common content-types are:   image/jpg, image/png, application/pdf, application/zip, application/msword
// If you don't know, use application/octet-stream
CkoHttpResponse *resp = [http PBinaryBd: @"POST" url: url data: bd contentType: @"image/jpg" md5: NO gzip: NO];
if (http.LastMethodSuccess != YES) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

NSLog(@"%@%d",@"Response Status Code: ",[resp.StatusCode intValue]);

CkoJsonObject *jsonResponse = [[CkoJsonObject alloc] init];
[jsonResponse Load: resp.BodyStr];
jsonResponse.EmitCompact = NO;
NSLog(@"%@",[jsonResponse Emit]);

if ([resp.StatusCode intValue] != 200) {
    NSLog(@"%@",@"Failed.");

    return;
}

// A sample response:

// Use this online tool to generate parsing code from sample JSON: 
// Generate Parsing Code from JSON

// {
//   "Id": "35333c64-4449-457b-bf6a-1b64d538e3c7",
//   "Status": "OK",
//   "ProviderName": "Chilkat2222",
//   "DateTimeUTC": "\/Date(1587212597758)\/",
//   "Attachments": [
//     {
//       "AttachmentID": "daf106e2-8634-4349-bfcc-86c1df0793b2",
//       "FileName": "penguins.jpg",
//       "Url": "https://api.xero.com/api.xro/2.0/Invoices/0032f627-3156-4d30-9b1c-4d3b994dc921/Attachments/penguins.jpg",
//       "MimeType": "image/jpg",
//       "ContentLength": 777835
//     }
//   ]
// }