wordpress-activitypub/tests/test-class-activitypub-rest-post-signature-verification.php

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<?php
class Test_Activitypub_Signature_Verification extends WP_UnitTestCase {
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public function test_activity_signature() {
// Activity for generate_digest
$post = \wp_insert_post(
array(
'post_author' => 1,
'post_content' => 'hello world',
)
);
$remote_actor = \get_author_posts_url( 2 );
$activitypub_post = new \Activitypub\Model\Post( $post );
$activitypub_activity = new Activitypub\Model\Activity( 'Create' );
$activitypub_activity->from_post( $activitypub_post );
$activitypub_activity->add_cc( $remote_actor );
$activity = $activitypub_activity->to_json();
// generate_digest & generate_signature
$digest = Activitypub\Signature::generate_digest( $activity );
$date = gmdate( 'D, d M Y H:i:s T' );
$signature = Activitypub\Signature::generate_signature( 1, 'POST', $remote_actor, $date, $digest );
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$this->assertRegExp( '/keyId="http:\/\/example\.org\/\?author=1#main-key",algorithm="rsa-sha256",headers="\(request-target\) host date digest",signature="[^"]*"/', $signature );
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// Signed headers
$url_parts = wp_parse_url( $remote_actor );
$route = $url_parts['path'] . '?' . $url_parts['query'];
$host = $url_parts['host'];
$headers = array(
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'digest' => array( $digest ),
'signature' => array( $signature ),
'date' => array( $date ),
'host' => array( $host ),
'(request-target)' => array( 'post ' . $route ),
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);
// Start verification
// parse_signature_header, get_signed_data, get_public_key
$signature_block = Activitypub\Signature::parse_signature_header( $headers['signature'] );
$signed_headers = $signature_block['headers'];
$signed_data = Activitypub\Signature::get_signed_data( $signed_headers, $signature_block, $headers );
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$public_key = Activitypub\Signature::get_public_key( 1 );
// signature_verification
$verified = \openssl_verify( $signed_data, $signature_block['signature'], $public_key, 'rsa-sha256' ) > 0;
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$this->assertTrue( $verified );
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}
public function test_rest_activity_signature() {
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add_filter(
'pre_get_remote_metadata_by_actor',
function( $json, $actor ) {
// return ActivityPub Profile with signature
return array(
'id' => $actor,
'type' => 'Person',
'publicKey' => array(
'id' => $actor . '#main-key',
'owner' => $actor,
'publicKeyPem' => \Activitypub\Signature::get_public_key( 1 ),
),
);
},
10,
2
);
// Activity Object
$post = \wp_insert_post(
array(
'post_author' => 1,
'post_content' => 'hello world',
)
);
$remote_actor = \get_author_posts_url( 2 );
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$remote_actor_inbox = Activitypub\get_rest_url_by_path( '/inbox' );
$activitypub_post = new \Activitypub\Model\Post( $post );
$activitypub_activity = new Activitypub\Model\Activity( 'Create' );
$activitypub_activity->from_post( $activitypub_post );
$activitypub_activity->add_cc( $remote_actor_inbox );
$activity = $activitypub_activity->to_json();
// generate_digest & generate_signature
$digest = Activitypub\Signature::generate_digest( $activity );
$date = gmdate( 'D, d M Y H:i:s T' );
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$signature = Activitypub\Signature::generate_signature( 1, 'POST', $remote_actor_inbox, $date, $digest );
// Signed headers
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$url_parts = wp_parse_url( $remote_actor_inbox );
$route = $url_parts['path'] . '?' . $url_parts['query'];
$host = $url_parts['host'];
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$request = new WP_REST_Request( 'POST', $route );
$request->set_header( 'content-type', 'application/activity+json' );
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$request->set_header( 'digest', $digest );
$request->set_header( 'signature', $signature );
$request->set_header( 'date', $date );
$request->set_header( 'host', $host );
$request->set_body( $activity );
// Start verification
$verified = \Activitypub\Signature::verify_http_signature( $request );
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$this->assertTrue( $verified );
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remove_filter( 'pre_get_remote_metadata_by_actor', array( get_called_class(), 'pre_get_remote_key' ), 10, 2 );
}
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}