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measurement-protocol.js
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measurement-protocol.js
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import { stringify } from 'querystring';
import http from '@haensl/http';
const config = {
fetch: undefined,
measurementId: undefined,
measurementSecret: undefined,
measurementUrl: 'https://www.google-analytics.com/mp/collect'
};
const getUrl = () => new URL(`${config.measurementUrl}?${stringify({
measurement_id: config.measurementId,
api_secret: config.measurementSecret
})}`);
/**
* Tries to parse Google Analytics client id from
* the cookies object.
* Generates one from timestamps if no cookie.
*/
export const clientId = (cookies = {}) => {
const gaCookie = cookies._ga;
if (gaCookie) {
const clientIdTest = /\d+\.\d+/.exec(gaCookie);
if (Array.isArray(clientIdTest) && clientIdTest.length > 0) {
return clientIdTest[0];
}
}
const pre = Math.round(new Date().getTime() / 1000);
const post = Math.round(new Date().getTime() / 1000);
return `${pre}.${post}`;
};
/**
* Initialize the service with measurement ID and secret.
*/
export const init = ({
fetch,
measurementId,
measurementSecret,
measurementUrl
}) => {
config.measurementId = measurementId;
config.measurementSecret = measurementSecret;
config.measurementUrl = measurementUrl;
config.fetch = fetch;
};
/**
* Tracks an analytics event via measurement protocol,
* i.e. via API.
*
* @param name the event name.
*
* @param params the event parameters.
*
* @param clientId the clientId for this event. Generated if not supplied.
*/
export const event = ({
name,
params,
clientId = clientId()
}) => {
const url = getUrl();
return config.fetch(url, {
method: http.methods.post,
body: JSON.stringify({
client_id: clientId,
events: [
{
name,
params
}
]
})
});
};
export const setUserProperty = ({
name,
value,
clientId = clientId()
}) => {
const url = getUrl();
return config.fetch(url, {
method: http.methods.post,
body: JSON.stringify({
client_id: clientId,
user_properties: {
[name]: value
}
})
});
};
export const setUserId = ({
id,
clientId = clientId()
}) => {
const url = getUrl();
return config.fetch(url, {
method: http.methods.post,
body: JSON.stringify({
user_id: id
})
});
};
export const exception = ({
description,
fatal,
clientId = clientId()
}) => {
return event({
name: 'exception',
params: {
description,
fatal
},
clientId
});
};
export const pageView = ({
location,
title,
clientId = clientId()
}) => {
return event({
name: 'page_view',
params: {
page_title: title,
page_location: location
},
clientId
});
};
export default {
init,
clientId,
event,
exception,
pageView,
setUserId,
setUserProperty
};