Google analytics v3 REST API, for total page view, top pages etc

analytics-provider.ts

import { APIGatewayEvent } from "aws-lambda";
import { google } from "googleapis";
import request from "request-promise";
import key from "../../config/service-account.json";

export class AnalyticsProvider {

    private requestBody: any;
    private requestHeader: any;
    private request: APIGatewayEvent;
    private urlString: string = "";
    private endDate: string = "";
    private token: any;

    constructor(req: APIGatewayEvent) {
        this.request = req;

        this.requestBody = (req.body) ? JSON.parse(req.body) : {};
        this.requestHeader = ((req as APIGatewayEvent).multiValueHeaders) ? (req as APIGatewayEvent).multiValueHeaders : {};

        this.urlString = this.requestBody?.url;
        this.endDate = this.requestBody?.endDate;
    }

    private async getToken() {
        if (!this.token) {
            const jwtClient = new google.auth.JWT(
                key.client_email,
                undefined,
                key.private_key,
                ["https://www.googleapis.com/auth/analytics.readonly"],
                undefined
            );

            this.token = await jwtClient.authorize();
        }

        return this.token;
    }

    async getURLAnalyticsData() {
        await this.getToken();
        
        let resp;
        let urlListResponse;
        try {
            let pageView = 0;
            if (this.urlString) {
                resp = await this.getViewsBasedOnPage();
                const { totalsForAllResults } = JSON.parse(resp);
                pageView = totalsForAllResults["ga:pageviews"];
            } else {
                resp = await this.totalPageView();
                const { totalsForAllResults } = JSON.parse(resp);
                pageView = totalsForAllResults["ga:pageviews"];
            }

            urlListResponse = await this.getTopURL();
            const { rows } = JSON.parse(urlListResponse);

            return {
                pageViews: pageView,
                topPost: rows
            };
        } catch (error) {
            resp = {};
            return {
                status: 400
            }
        }
    }

    private async getViewsBasedOnPage() {
        const url = `https://www.googleapis.com/analytics/v3/data/ga?ids=ga:214292350&dimensions=ga:pagePath&metrics=ga:pageviews&filters=ga:pagePath==${this.urlString}&start-date=2019-01-01&end-date=${this.endDate}&max-results=1`;

        const options = {
            url,
            method: "GET",
            headers: {
                "Content-Type": "application/json"
            },
            auth: {
                "bearer": this.token.access_token
            }
        }

        const resp = await request(options);
        return resp;
    }

    private async getTopURL() {
        const url = `https://www.googleapis.com/analytics/v3/data/ga?ids=ga:214292350&dimensions=ga:landingPagePath,ga:pageTitle&metrics=ga:pageviews&sort=-ga:pageviews&start-date=2019-01-01&end-date=${this.endDate}&max-results=20&filters=ga:medium==organic`;

        const options = {
            url,
            method: "GET",
            headers: {
                "Content-Type": "application/json"
            },
            auth: {
                "bearer": this.token.access_token
            }
        }

        const resp = await request(options);
        return resp;
    }

    private async totalPageView() {
        const url = `https://www.googleapis.com/analytics/v3/data/ga?ids=ga:214292350&metrics=ga:pageviews&start-date=2019-01-01&end-date=${this.endDate}&max-results=1`;

        const options = {
            url,
            method: "GET",
            headers: {
                "Content-Type": "application/json"
            },
            auth: {
                "bearer": this.token.access_token
            }
        }

        const resp = await request(options);
        return resp;
    }
}