server.js

var express = require('express'),
    http = require('http');
    bodyParser = require('body-parser'),
    proxy = require('express-http-proxy'),
    urlHelper = require('url');
const latexService = require('./latexService.js')

// ENV Variables
const BASE_URL = 'dock.sunbirded.org';
const API_AUTH_TOKEN = "";
const PORTAL_COOKIES= ""
const USER_TOKEN = "";


var app = express();
app.set('port', 3000);
app.use(express.json())
app.get("/latex/convert", latexService.convert)
app.post("/latex/convert", bodyParser.json({ limit: '1mb' }), latexService.convert);
app.all(['/api/framework/v1/read/*',
     '/learner/framework/v1/read/*', 
     '/api/channel/v1/read/*'], proxy(BASE_URL, {
    https: true,
    proxyReqPathResolver: function(req) {
        console.log('proxyReqPathResolver ',  urlHelper.parse(req.url).path);
        return urlHelper.parse(req.url).path;
    },
    proxyReqOptDecorator: function(proxyReqOpts, srcReq) {
        console.log('proxyReqOptDecorator 2')
        // you can update headers
        proxyReqOpts.headers['Content-Type'] = 'application/json';
        proxyReqOpts.headers['user-id'] = 'content-editor';
        proxyReqOpts.headers['Cookie'] = PORTAL_COOKIES;
        proxyReqOpts.headers['authorization'] = `Bearer ${API_AUTH_TOKEN}`;
        return proxyReqOpts;
    }
}));
app.use(['/action/questionset/v1/*',
    '/action/question/v1/*',
    '/action/collection/v1/*',
    '/action/object/category/definition/v1/*',
    '/action/collection/v1/*'
    ], proxy(BASE_URL, {
    https: true,
    limit: '30mb',
    proxyReqPathResolver: function (req) {
        let originalUrl = req.originalUrl.replace('/action/', '/api/')
        console.log('proxyReqPathResolver questionset', originalUrl, require('url').parse(originalUrl).path);
        return require('url').parse(originalUrl).path;
    },
    proxyReqOptDecorator: function (proxyReqOpts, srcReq) {
        console.log('proxyReqOptDecorator 3')
        // you can update headers
        proxyReqOpts.headers['Content-Type'] = 'application/json';
        proxyReqOpts.headers['user-id'] = 'content-editor';
        proxyReqOpts.headers['Cookie'] = PORTAL_COOKIES;
        proxyReqOpts.headers['authorization'] = `Bearer ${API_AUTH_TOKEN}`;
        proxyReqOpts.headers['x-authenticated-user-token'] = USER_TOKEN;
         return proxyReqOpts;
    }
}));

app.use(['/action/program/v1/*',
    '/action/question/v1/bulkUpload',
    '/action/question/v1/bulkUploadStatus'
    ], proxy(BASE_URL, {
    https: true,
    limit: '30mb',
    proxyReqPathResolver: function (req) {
        let originalUrl = req.originalUrl.replace('/action/', '/api/')
        console.log('proxyReqPathResolver questionset', originalUrl, require('url').parse(originalUrl).path);
        return require('url').parse(originalUrl).path;
    },
    proxyReqOptDecorator: function (proxyReqOpts, srcReq) {
        console.log('proxyReqOptDecorator 3')
        // you can update headers
        proxyReqOpts.headers['Content-Type'] = 'application/json';
        proxyReqOpts.headers['user-id'] = 'content-editor';
        proxyReqOpts.headers['Cookie'] = PORTAL_COOKIES;
        proxyReqOpts.headers['authorization'] = `Bearer ${API_AUTH_TOKEN}`;
        proxyReqOpts.headers['x-authenticated-user-token'] = USER_TOKEN;
         return proxyReqOpts;
    }
}));

app.use(['/api','/assets','/action'], proxy(BASE_URL, {
    https: true,
    limit: '30mb',
    proxyReqPathResolver: function(req) {
        console.log('proxyReqPathResolver ',  urlHelper.parse(req.url).path);
        return urlHelper.parse(req.url).path;
    },
    proxyReqOptDecorator: function(proxyReqOpts, srcReq) {
        console.log('proxyReqOptDecorator 4')
        // you can update headers
        proxyReqOpts.headers['Content-Type'] = 'application/json';
        proxyReqOpts.headers['user-id'] = 'content-editor';
        proxyReqOpts.headers['Cookie'] = PORTAL_COOKIES;
        return proxyReqOpts;
    }
}));

app.use(['/action/content/*'], proxy(BASE_URL, {
    https: true,
    proxyReqPathResolver: function (req) {
        let originalUrl = req.originalUrl.replace('/api/', '/api/')
        console.log('proxyReqPathResolver questionset', originalUrl, require('url').parse(originalUrl).path);
        return require('url').parse(originalUrl).path;
    },
    proxyReqOptDecorator: function (proxyReqOpts, srcReq) {
        console.log('proxyReqOptDecorator 1')
        // you can update headers
        proxyReqOpts.headers['Content-Type'] = 'application/json';
        proxyReqOpts.headers['user-id'] = 'content-editor';
        proxyReqOpts.headers['Cookie'] = PORTAL_COOKIES;
        return proxyReqOpts;
    }
}));
app.use(['/content/preview/*', '/content-plugins/*', '/assets/public/*'], proxy(BASE_URL, {
    https: true,
    proxyReqPathResolver: function(req) {
        return require('url').parse(`https://${BASE_URL}` + req.originalUrl).path
    },
    proxyReqOptDecorator: function(proxyReqOpts, srcReq) {
        console.log('proxyReqOptDecorator 5')
        // you can update headers 
        proxyReqOpts.headers['Content-Type'] = 'application/json';
        proxyReqOpts.headers['user-id'] = 'content-editor';
        proxyReqOpts.headers['Cookie'] = PORTAL_COOKIES;
        proxyReqOpts.headers['authorization'] = `Bearer ${API_AUTH_TOKEN}`;
        return proxyReqOpts;
    }
}));
http.createServer(app).listen(app.get('port'), 3000);