/**
 * Thin jQuery.ajax wrapper for WP REST API requests.
 *
 * Currently only applies to requests that do not use the `wp-api.js` Backbone
 * client library, though this may change.  Serves several purposes:
 *
 * - Allows overriding these requests as needed by customized WP installations.
 * - Sends the REST API nonce as a request header.
 * - Allows specifying only an endpoint namespace/path instead of a full URL.
 *
 * @since 4.9.0
 * @since 5.6.0 Added overriding of the "PUT" and "DELETE" methods with "POST".
 *              Added an "application/json" Accept header to all requests.
 * @output wp-includes/js/api-request.js
 */

( function( $ ) {
var wpApiSettings = window.wpApiSettings;

function apiRequest( options ) {
options = apiRequest.buildAjaxOptions( options );
return apiRequest.transport( options );
}

apiRequest.buildAjaxOptions = function( options ) {
var url = options.url;
var path = options.path;
var method = options.method;
var namespaceTrimmed, endpointTrimmed, apiRoot;
var headers, addNonceHeader, addAcceptHeader, headerName;

if (
typeof options.namespace === 'string' &&
typeof options.endpoint === 'string'
) {
namespaceTrimmed = options.namespace.replace( /^\/|\/$/g, '' );
endpointTrimmed = options.endpoint.replace( /^\//, '' );
if ( endpointTrimmed ) {
path = namespaceTrimmed + '/' + endpointTrimmed;
} else {
path = namespaceTrimmed;
}
}
if ( typeof path === 'string' ) {
apiRoot = wpApiSettings.root;
path = path.replace( /^\//, '' );

// API root may already include query parameter prefix
// if site is configured to use plain permalinks.
if ( 'string' === typeof apiRoot && -1 !== apiRoot.indexOf( '?' ) ) {
path = path.replace( '?', '&' );
}

url = apiRoot + path;
}

// If ?_wpnonce=... is present, no need to add a nonce header.
addNonceHeader = ! ( options.data && options.data._wpnonce );
addAcceptHeader = true;

headers = options.headers || {};

for ( headerName in headers ) {
if ( ! headers.hasOwnProperty( headerName ) ) {
continue;
}

// If an 'X-WP-Nonce' or 'Accept' header (or any case-insensitive variation
// thereof) was specified, no need to add the header again.
switch ( headerName.toLowerCase() ) {
case 'x-wp-nonce':
addNonceHeader = false;
break;
case 'accept':
addAcceptHeader = false;
break;
}
}

if ( addNonceHeader ) {
// Do not mutate the original headers object, if any.
headers = $.extend( {
'X-WP-Nonce': wpApiSettings.nonce
}, headers );
}

if ( addAcceptHeader ) {
headers = $.extend( {
'Accept': 'application/json, */*;q=0.1'
}, headers );
}

if ( typeof method === 'string' ) {
method = method.toUpperCase();

if ( 'PUT' === method || 'DELETE' === method ) {
headers = $.extend( {
'X-HTTP-Method-Override': method
}, headers );

method = 'POST';
}
}

// Do not mutate the original options object.
options = $.extend( {}, options, {
headers: headers,
url: url,
method: method
} );

delete options.path;
delete options.namespace;
delete options.endpoint;

return options;
};

apiRequest.transport = $.ajax;

/** @namespace wp */
window.wp = window.wp || {};
window.wp.apiRequest = apiRequest;
} )( jQuery );