(Objective-C) curl with Variable Substitution in an XML Request Body

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This example shows how to use variables inside an XML request body using the {{variable_name}} syntax. When the HTTP request’s Content-Type indicates XML, Chilkat automatically applies proper XML entity encoding to each substituted value, ensuring the resulting XML remains valid.

Note: This example requires Chilkat v11.5.0 or greater.

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#import <CkoStringBuilder.h>
#import <CkoHttpCurl.h>

BOOL success = NO;

// Variable names are enclosed between {{ and }}

// curl -X POST https://api.example.com/api/orders \
//   -H "Content-Type: application/xml; charset=utf-8" \
//   -H "Accept: application/xml" \
//   -d '<order>
//   <customerName>{{customer_name}}</customerName>
//   <note>{{note}}</note>
//   <address>{{address}}</address>
//   <instructions>{{instructions}}</instructions>
// </order>'

CkoStringBuilder *sbCurl = [[CkoStringBuilder alloc] init];
[sbCurl AppendLn: @"curl -X POST https://api.example.com/api/orders \\"];
[sbCurl AppendLn: @"  -H \"Content-Type: application/xml; charset=utf-8\" \\"];
[sbCurl AppendLn: @"  -H \"Accept: application/xml\" \\"];
[sbCurl AppendLn: @"  -d '<order>"];
[sbCurl AppendLn: @"  <customerName>{{customer_name}}</customerName>"];
[sbCurl AppendLn: @"  <note>{{note}}</note>"];
[sbCurl AppendLn: @"  <address>{{address}}</address>"];
[sbCurl AppendLn: @"  <instructions>{{instructions}}</instructions>"];
[sbCurl AppendLn: @"</order>'"];

CkoHttpCurl *curl = [[CkoHttpCurl alloc] init];

// The values below contain chars that will require XML entity encoding.  
// Chilkat will automatically do the encoding because the Content-Type of this request is "application/xml"
[curl SetVar: @"customer_name" varValue: @"John & Sons"];
[curl SetVar: @"note" varValue: @"He said \"Ship it ASAP!\""];
[curl SetVar: @"address" varValue: @"123 <Main> Street"];
[curl SetVar: @"instructions" varValue: @"Use door #2 & call upon arrival"];

// To demonstrate how the variables are replaced, this example does not execute the curl command. 
// Instead, it generates the raw HTTP request that would be sent if the curl command were run.
CkoStringBuilder *sbRawRequest = [[CkoStringBuilder alloc] init];
success = [curl ToRawRequest: [sbCurl GetAsString] sb: sbRawRequest];
if (success == NO) {
    NSLog(@"%@",curl.LastErrorText);
    return;
}

NSLog(@"%@",[sbRawRequest GetAsString]);

// The output is shown below.
// Notice the chars that were XML entity encoded.

// POST /api/orders HTTP/1.1
// Accept: application/xml
// Host: api.example.com
// Content-Type: application/xml; charset=utf-8
// Content-Length: 229
// 
// <order>
//   <customerName>John &amp; Sons</customerName>
//   <note>He said &quot;Ship it ASAP!&quot;</note>
//   <address>123 &lt;Main&gt; Street</address>
//   <instructions>Use door #2 &amp; call upon arrival</instructions>
// </order>