(Perl) Schwab OAuth2 in a Desktop App

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Note: This example requires Chilkat v10.1.2 or greater.

Chilkat Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux

use chilkat();

$success = 0;

# To further clarify, see OAuth 2.0 Authorization Flow

# This is the way to initially obtain the OAuth2 access token.  Afterwards it can be 
# repeatedly refreshed without user interaction, as shown in this example: Refresh Schwab OAuth2 Access Token.

$oauth2 = chilkat::CkOAuth2->new();

# Your applicaton must use your own public web server as an intermediate
# to receive and forward the redirect to localhost.
# See Using Your Web Server as an Intermediary for OAuth2 Redirect to localhost

$oauth2->put_AppCallbackUrl("https://yourwebserver.com/OAuth2.php");
$oauth2->put_ListenPort(3017);

$oauth2->put_AuthorizationEndpoint("https://api.schwabapi.com/v1/oauth/authorize");
$oauth2->put_TokenEndpoint("https://api.schwabapi.com/v1/oauth/token");

# Replace these with actual values.
$oauth2->put_ClientId("APP_KEY");
$oauth2->put_ClientSecret("APP_SECRET");
$oauth2->put_UseBasicAuth(1);
$oauth2->put_CodeChallenge(0);

$oauth2->put_Scope("");

# Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
$url = $oauth2->startAuth();
if ($oauth2->get_LastMethodSuccess() == 0) {
    print $oauth2->lastErrorText() . "\r\n";
    exit;
}

print "url = " . $url . "\r\n";

# 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() . "\r\n";
    exit;
}

# Wait for the user to approve or deny authorization in the browser.
$numMsWaited = 0;
while (($numMsWaited < 90000) and ($oauth2->get_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->get_AuthFlowState() < 3) {
    $oauth2->Cancel();
    print "No response from the browser!" . "\r\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->get_AuthFlowState() == 5) {
    print "OAuth2 failed to complete." . "\r\n";
    print $oauth2->failureInfo() . "\r\n";
    exit;
}

if ($oauth2->get_AuthFlowState() == 4) {
    print "OAuth2 authorization was denied." . "\r\n";
    print $oauth2->accessTokenResponse() . "\r\n";
    exit;
}

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

# Save the full JSON access token response to a file.
$sbJson = chilkat::CkStringBuilder->new();
$sbJson->Append($oauth2->accessTokenResponse());
$sbJson->WriteFile("qa_data/tokens/schwab-access-token.json","utf-8",0);

# The full JSON received looks like this:
# {
#   "expires_in": 3600,
#   "x_refresh_token_expires_in": 8726400,
#   "refresh_token": "L011546037639r ... 3vR2DrbOmg0Sdagw",
#   "access_token": "eyJlbmMiOiJBMTI4Q0 ... oETJEMbeggg",
#   "token_type": "bearer"
# }

print "OAuth2 authorization granted!" . "\r\n";
print "Access Token = " . $oauth2->accessToken() . "\r\n";