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import crypto from 'crypto';
import { type Request } from 'express';
import superagent from 'superagent';
const URL = require( 'url' );
interface UserParameters {
_ul?: string;
_ui: string | number;
_ut: string;
}
function getUserFromRequest( request: Request ): UserParameters {
// if user has a cookie, lets use that
const encodedUserCookie = request?.cookies?.wordpress_logged_in ?? null;
if ( encodedUserCookie ) {
try {
const userCookieParts = decodeURIComponent( encodedUserCookie ).split( '|' );
// We don't trust it, but for analytics this is enough
return {
_ul: userCookieParts[ 0 ],
_ui: parseInt( userCookieParts[ 1 ], 10 ),
_ut: 'wpcom:user_id',
};
} catch ( ex ) {
// ignore the error and let it fallback to anonymous below
}
}
// if user doesn't have a cookie, and we had the user identification passed to us on query params
// we'll use that, otherwise, we'll just use anonymous.
// If we have a full identity on query params - use it
if ( request?.query?._ut && request?.query?._ui ) {
return {
_ui: request.query._ui as string,
_ut: request.query._ut as string,
};
}
// We didn't get a full identity, create an anon ID
return {
_ut: 'anon',
_ui: crypto.randomUUID(),
};
}
const analytics = {
tracks: {
createPixel: function ( data: Record< string, string | number | undefined > ) {
data._rt = new Date().getTime();
data._ = '_';
const pixelUrl = URL.format( {
protocol: 'http',
host: 'pixel.wp.com',
pathname: '/t.gif',
query: data,
} );
superagent.get( pixelUrl ).end();
},
recordEvent: function (
eventName: string,
eventProperties: Record< string, string | undefined >,
req: Request
) {
eventProperties = eventProperties || {};
if ( eventName.indexOf( 'calypso_' ) !== 0 ) {
console.warn( '- Event name must be prefixed by "calypso_"' );
return;
}
// Remove properties that have an undefined value
// This allows a caller to easily remove properties from the recorded set by setting them to undefined
eventProperties = Object.fromEntries(
Object.entries( eventProperties ).filter( ( entry ) => entry[ 1 ] !== undefined )
);
const date = new Date();
const acceptLanguageHeader = req.get( 'Accept-Language' ) || '';
this.createPixel( {
_en: eventName,
_ts: date.getTime(),
_dl: req.get( 'Referer' ),
_lg: acceptLanguageHeader.split( ',' )[ 0 ],
_via_ip: req.get( 'x-forwarded-for' ) || req.connection.remoteAddress,
_via_ua: req.get( 'user-agent' ),
...getUserFromRequest( req ),
...eventProperties,
} );
},
},
};
export default analytics;
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