(Objective-C) Test Salesforce OAuth2 Access Token

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Demonstrates how to make a simple Salesforce REST API call to test a previously obtained access token.

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#import <CkoHttp.h>
#import <CkoJsonObject.h>
#import <CkoStringBuilder.h>

// This example does the following:

// curl -X GET https://yourInstance.salesforce.com/services/oauth2/userinfo \
//      -H "Authorization: Bearer YOUR_ACCESS_TOKEN"

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

// Use the following online tool to generate HTTP code from a CURL command
// Convert a cURL Command to HTTP Source Code

// This example assumes the OAuth2 access token was previously fetched 
// and saved to a file.  See Get SalesForce OAuth2 Access Token via Authorization Flow

CkoJsonObject *json = [[CkoJsonObject alloc] init];
BOOL success = [json LoadFile: @"qa_data/tokens/_salesforce.json"];
if (success == NO) {
    NSLog(@"%@",@"Failed to load OAuth2 access token.");
    return;
}

// Here's an example of the JSON:

// {
//   "access_token": "00D41000....uLZBpT6",
//   "refresh_token": "5Aep....25xdGgkrV",
//   "signature": "cjTbSc5DvcKpaMoRTzuQTJLb1tcMw8LEO01flq4aMD4=",
//   "scope": "refresh_token id",
//   "instance_url": "https://d41000000f8a0eak-dev-ed.my.salesforce.com",
//   "id": "https://login.salesforce.com/id/00D41000000F8A0EAK/005410000....xAAE",
//   "token_type": "Bearer",
//   "issued_at": "1738348388166"
// }

// Adds the "Authorization: Bearer YOUR_ACCESS_TOKEN" header.
http.AuthToken = [json StringOf: @"access_token"];

// We want to build the following URL:  https://<instance_id>.salesforce.com/services/oauth2/userinfo
CkoStringBuilder *sbUrl = [[CkoStringBuilder alloc] init];
[sbUrl Append: [json StringOf: @"instance_url"]];
[sbUrl Append: @"/services/oauth2/userinfo"];

CkoStringBuilder *sbResponseBody = [[CkoStringBuilder alloc] init];
success = [http QuickGetSb: [sbUrl GetAsString] sbContent: sbResponseBody];
if (success == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

NSLog(@"%@%d",@"Response status code = ",[http.LastStatus intValue]);

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

// The expected JSON response is something like this:

// {
//   "sub": "005xxxxxxxxxxxx",
//   "name": "John Doe",
//   "preferred_username": "johndoe@example.com",
//   "email": "johndoe@example.com",
//   "profile": "https://na85.salesforce.com/005xxxxxxxxxxxx"
// ...
// ...
// }