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add pkce support #9

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1cedec1
bump league/oauth2-client to 2.8.1
gkemmey Oct 7, 2025
4fa947b
add pkce support
gkemmey Oct 7, 2025
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3 changes: 1 addition & 2 deletions README.md
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
# PCO API OAuth Slim PHP Example
# PCO API OAuth / OIDC / PKCE Example - Slim + PHP

This is an example Slim PHP app for demonstrating how one might build an app to authenticate any PCO user
and then subsequently use that authentication to query the API.
Expand Down Expand Up @@ -30,4 +30,3 @@ You can learn more about Planning Center's API [here](https://developer.planning
## Copyright & License

Copyright Ministry Centered Technologies. Licensed MIT.

87 changes: 16 additions & 71 deletions composer.lock
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17 changes: 15 additions & 2 deletions public/index.php
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Expand Up @@ -26,7 +26,8 @@
"scopes" => ["openid", "people"],
"urlAccessToken" => "{$container->get("apiUrl")}/oauth/token",
"urlAuthorize" => "{$container->get("apiUrl")}/oauth/authorize",
"urlResourceOwnerDetails" => "{$container->get("apiUrl")}/oauth/userinfo"
"urlResourceOwnerDetails" => "{$container->get("apiUrl")}/oauth/userinfo",
"pkceMethod" => \League\OAuth2\Client\Provider\GenericProvider::PKCE_METHOD_S256
]);
});
AppFactory::setContainer($container);
Expand Down Expand Up @@ -103,10 +104,14 @@
$app->get("/auth", function (Request $request, Response $response, $args) {
// Build the authorization URL and redirect to it
$oauth = $this->get("oauth");
$session = $this->get("session");

$authorizationUrl = $oauth->getAuthorizationUrl([
'prompt' => 'select_account' // to allow user account selection or "login" to force re-authentication
]);

$session->set("code_verifier", $oauth->getPkceCode());

return $response
->withHeader("Location", $authorizationUrl)
->withStatus(302);
Expand All @@ -117,9 +122,17 @@
$code = $request->getQueryParams()["code"];
// Use the code to fetch our access token
$oauth = $this->get("oauth");
$token = $oauth->getAccessToken("authorization_code", ["code" => $code]);

// Restore the PKCE code for the token exchange
$session = $this->get("session");
if ($session->exists("code_verifier")) {
$oauth->setPkceCode($session->get("code_verifier"));
}

$token = $oauth->getAccessToken("authorization_code", ["code" => $code]);

$session->delete("code_verifier");

// Set the token in our session
$session->set("token", $token);

Expand Down