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wp-content/plugins/jetpack-boost/app/rest-api/endpoints/class-list-source-providers.php

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+<?php
+/**
+ * Create a new request for source providers.
+ *
+ * Handler for GET '/list-source-providers'.
+ */
+
+namespace Automattic\Jetpack_Boost\REST_API\Endpoints;
+
+use Automattic\Jetpack_Boost\Lib\Critical_CSS\Source_Providers\Source_Providers;
+use Automattic\Jetpack_Boost\REST_API\Contracts\Endpoint;
+use Automattic\Jetpack_Boost\REST_API\Permissions\Signed_With_Blog_Token;
+
+class List_Source_Providers implements Endpoint {
+
+	public function request_methods() {
+		return \WP_REST_Server::READABLE;
+	}
+
+	public function response( $_request ) {
+		$providers = new Source_Providers();
+		return rest_ensure_response( $providers->get_provider_sources() );
+	}
+
+	public function permissions() {
+		return array(
+			new Signed_With_Blog_Token(),
+		);
+	}
+
+	public function name() {
+		return '/list-source-providers';
+	}
+}