PHP ActiveX Requires Chilkat v10.1.2+
Dynamics CRM OAuth2 Access Token

Demonstrates how to get a Microsoft Dynamics CRM OAuth2 access token from a desktop (installed) application or script.
Chilkat PHP ActiveX Downloads

PHP ActiveX
<?php

$success = 0;

//  To further clarify, see OAuth 2.0 Authorization Flow

$oauth2 = new COM("Chilkat.OAuth2");

//  This should be the port in the localhost redirect URL for your app.
//  Important: Make sure the redirect URI in your Azure app registration 
//  is exactly "http://localhost:3017/".  Don't forget the ending "/" char.
//  The redirect URL would look like "http://localhost:3017/" if the port number is 3017.
$oauth2->ListenPort = 3017;

//  Get the endpoints from the Azure Portal in the "endpoints" section of App Registrations..
//  The DYNAMICS-ENDPOINT-GUID is a Tenant dynamics-endpoint-guid  such as 1b54e7ee-d61b-4f12-a621-a6b2805b98c2
$oauth2->AuthorizationEndpoint = 'https://login.microsoftonline.com/DYNAMICS-ENDPOINT-GUID/oauth2/authorize';
$oauth2->TokenEndpoint = 'https://login.microsoftonline.com/DYNAMICS-ENDPOINT-GUID/oauth2/token';

//  Replace these with actual values.
$oauth2->ClientId = 'DYNAMICS-CRM-CLIENT-ID';
$oauth2->ClientSecret = 'DYNAMICS-CRM-SECRET-KEY';

$oauth2->Resource = 'https://mydynamicsdomain.api.crm.dynamics.com';

$oauth2->RedirectAllowHtml = '<html><body><p>Thank you for granting access.</p></bod></html>';
$oauth2->RedirectDenyHtml = '<html><body><p>Maybe next time...</p></bod></html>';

//  Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
$url = $oauth2->startAuth();
if ($oauth2->LastMethodSuccess != 1) {
    print $oauth2->LastErrorText . "\n";
    exit;
}

//  We can pre-check the URL by sending a GET to catch any up-front errors.
//  If we receive JSON with an error in response, then we don't proceed any farther.

//  If we receive an HTML response, and the response status = 200, then all should be OK.
//  We can proceed by displaying an interactive browser loaded with the url.
$http = new COM("Chilkat.Http");
$sbPreCheck = new COM("Chilkat.StringBuilder");
$success = $http->QuickGetSb($url,$sbPreCheck);
if (($http->LastStatus != 200) or ($sbPreCheck->StartsWith('{',1) != 1)) {
    print 'JSON Error Response:' . "\n";
    print $sbPreCheck->getAsString() . "\n";
    exit;
}

//  If the HTTP request itself failed, then examine the error.
if ($success == 0) {
    print $http->LastErrorText . "\n";
    exit;
}

//  OK.. the pre-flight check seems OK, go ahead with getting the interactive user authorization..

//  Launch the default browser on the system and navigate to the url.
//  The LaunchBrowser method was added in Chilkat v10.1.2.
$success = $oauth2->LaunchBrowser($url);
if ($success == 0) {
    print $oauth2->LastErrorText . "\n";
    exit;
}

//  Wait for the user to approve or deny authorization in the browser.
$numMsWaited = 0;
while (($numMsWaited < 90000) and ($oauth2->AuthFlowState < 3)) {
    $oauth2->SleepMs(100);
    $numMsWaited = $numMsWaited + 100;
}

//  If the browser does not respond within the specified time, AuthFlowState will be:
//  
//  1: Waiting for Redirect – The OAuth2 background thread is waiting for the browser's redirect request.
//  2: Waiting for Final Response – The thread is awaiting the final access token response.
//  In either case, cancel the background task initiated by StartAuth.

if ($oauth2->AuthFlowState < 3) {
    $oauth2->Cancel();
    print 'No response from the browser!' . "\n";
    exit;
}

//  Check AuthFlowState to determine if authorization was granted, denied, or failed:
//  
//  3: Success – OAuth2 flow completed, the background thread exited, and the successful response is in AccessTokenResponse.
//  4: Access Denied – OAuth2 flow completed, the background thread exited, and the error response is in AccessTokenResponse.
//  5: Failure – OAuth2 flow failed before completion, the background thread exited, and error details are in FailureInfo.

if ($oauth2->AuthFlowState == 5) {
    print 'OAuth2 failed to complete.' . "\n";
    print $oauth2->FailureInfo . "\n";
    exit;
}

if ($oauth2->AuthFlowState == 4) {
    print 'OAuth2 authorization was denied.' . "\n";
    print $oauth2->AccessTokenResponse . "\n";
    exit;
}

if ($oauth2->AuthFlowState != 3) {
    print 'Unexpected AuthFlowState:' . $oauth2->AuthFlowState . "\n";
    exit;
}

print 'OAuth2 authorization granted!' . "\n";
print 'Access Token = ' . $oauth2->AccessToken . "\n";

//  Get the full JSON response:
$json = new COM("Chilkat.JsonObject");
$json->Load($oauth2->AccessTokenResponse);
$json->EmitCompact = 0;

//  The JSON response looks like this:

//  {
//    "token_type": "Bearer",
//    "scope": "user_impersonation",
//    "expires_in": "3599",
//    "ext_expires_in": "0",
//    "expires_on": "1524783438",
//    "not_before": "1524779538",
//    "resource": "https://mydomain.api.crm.dynamics.com",
//    "access_token": "...",
//    "refresh_token": "...",
//    "id_token": "..."
//  }

//  If an "expires_on" member does not exist, then add the JSON member by
//  getting the current system date/time and adding the "expires_in" seconds.
//  This way we'll know when the token expires.
if ($json->HasMember('expires_on') != 1) {
    $dtExpire = new COM("Chilkat.CkDateTime");
    $dtExpire->SetFromCurrentSystemTime();
    $dtExpire->AddSeconds($json->IntOf('expires_in'));
    $json->AppendString('expires_on',$dtExpire->getAsUnixTimeStr(0));
}

print $json->emit() . "\n";

//  Save the JSON to a file for future requests.
$fac = new COM("Chilkat.FileAccess");
$fac->WriteEntireTextFile('qa_data/tokens/dynamicsCrm.json',$json->emit(),'utf-8',0);

?>