Best effort migration of Node 4 webtask to Node 8

migrate.js

'use strict';

const Async = require('async');
const Acorn = require('acorn');
const AcornWalk = require('acorn/dist/walk');
const Astring = require('astring');
const Superagent = require('superagent');

module.exports = migrate;

/**
 * Migrates a webtask from https://webtask.it.auth0.com to https://sandbox.auth0-extend.com:
 * - analyzes code to uncover module dependencies ("require" only, no built-ins)
 * - merges the implicit module dependencies with explicit module dependencies
 * - ensures modules are built on Node 8
 * - re-creates the Node 4 webtask in Node 8 with secrets, code, and meta
 * 
 * options.container
 * options.name
 * options.token
 */
function migrate(options, cb) {

    const TYPE_GLOBAL = 'global';
    const TYPE_REQUIRE = 'require';
    const TYPE_REQUIRE_DYNAMIC = 'require_dynamic';
    var moduleTypes = {
        TYPE_GLOBAL,
        TYPE_REQUIRE,
        TYPE_REQUIRE_DYNAMIC,
    };
    
    const node4ModuleList = {
        nativeModuleNames: Object.keys(process.binding('natives')),
        verquireModules: 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uffer.slice":["0.0.6"],"open":["0.0.5"],"pause-stream":["0.0.11"],"di":["0.0.1"],"component-bind":["1.0.0"],"asn1.js":["2.0.3"],"when":["3.7.3"],"hash.js":["1.0.3"],"lodash-node":["3.9.3"],"better-assert":["1.0.2"],"delegates":["0.1.0"],"tiny-lr-fork":["0.0.5"],"karma-jasmine":["0.3.5"],"shallow-copy":["0.0.1"],"engine.io-client":["1.5.1"],"co":["4.5.4"],"cron-parser":["0.6.4"],"numeraljs":["1.5.3"],"unirest":["0.4.2"],"mock":["0.1.1"],"stats-analysis":["2.0.0"],"xero":["0.0.8"],"easyxml":["2.0.1"],"restify":["4.0.3"],"botbuilder":["3.4.4","0.9.0"],"cloudant":["1.4.1"],"ms-rest":["1.12.0"],"pdfkit":["0.7.2"],"bwip-js":["0.15.1"],"userapp":["2.0.0"],"moment-timezone":["0.5.7"],"google-distance":["1.0.1"],"gcm":["1.0.1"],"cryptr":["2.0.0"],"splunk-sdk":["1.8.1"],"amazon-product-api":["0.4.2"],"indico.io":["0.10.5"],"passport-wsfed-saml2":["2.11.4"],"dotenv":["2.0.0"],"pretty-data":["0.40.0"],"auth0-extension-tools":["1.0.0","1.2.1","1.3.1"],"mustache":["2.3.0"],"amazon-s3-url-signer":["0.1.0"],"mailgun-js":["0.7.14"],"auth0-api-jwt-rsa-validation":["0.0.1"],"pg-hstore":["2.3.2"],"firebase-admin":["4.0.4","5.0.0"],"node-wit":["4.2.0"],"Base64":["1.0.0"],"lokijs":["1.4.2"],"xml2json":["0.10.0"],"asana":["0.15.0"],"airtable":["0.4.3"],"pouchdb":["6.1.0"],"dynamicsnode":["0.0.17"],"randomstring":["1.1.5"],"hashids":["1.1.1"],"nexmo":["1.1.0"],"argon2":["0.14.1"],"jsonapi-datastore":["0.4.0-beta"],"intercom-client":["2.8.5"],"google-libphonenumber":["2.0.7"],"html-metadata":["1.6.2"],"osmosis":["1.1.2"],"postmark":["1.3.1"],"clearbit":["1.2.3"],"edit-google-spreadsheet":["0.2.21"],"mqtt":["2.2.1"],"node-django-hashers":["1.0.9"],"bunyan-loggly":["1.2.0"],"node-logentries":["0.1.4"],"raven":["1.1.1"],"fbgraph":["1.3.0"],"disposable-email-domains":["1.0.14","1.0.15"],"forecast":["0.3.2"],"speakeasy":["2.0.0"],"nodemailer-ses-transport":["1.5.0"],"lokka":["1.7.0"],"pdf2json":["1.1.7"],"xlsx":["0.8.8"],"node-xlsx":["0.7.4"],"xls-to-json-lc":["0.3.3"],"image-size":["0.5.1"],"the-noun-project":["2.0.1"],"amazon-mws-node":["1.0.4","1.0.3"],"freemail":["1.5.0"],"string-similarity":["1.1.0"],"natural":["0.5.1"],"jsonpatch-to-mongodb":["0.3.0"],"fast-json-patch":["1.2.1"],"pipedrive":["3.0.2"],"filter-object":["2.1.0"],"atlassian-crowd-client":["1.4.2"],"nock":["9.0.14"],"wappalyzer":["5.0.7"],"soap":["0.23.0"],"paynl-sdk":["1.0.7"],"aws-s3-zipper":["1.0.1"],"google-auth-library":["1.0.0"],"js-sha3":["0.7.0"]}
    };

    function parseVerquireSpec(spec) {
        const atIndex = spec.indexOf('@', 1);
    
        if (atIndex === -1) {
            return { name: spec, version: undefined };
        }
    
        return {
            name: spec.slice(0, atIndex - 1),
            version: spec.slice(atIndex + 1, 0),
        };
    }

    function parseCode(astOrCode) {
        return typeof astOrCode === 'string'
            ? Acorn.parse(astOrCode, {
                  allowReturnOutsideFunction: true,
              })
            : astOrCode;
    }

    function createDynamicDependency(node) {
        return {
            type: TYPE_REQUIRE_DYNAMIC,
            start: node.start,
            end: node.end,
            spec: node.arguments.map(exp => Astring.generate(exp)).join(''),
        };
    }

    function createStaticDependency(node) {
        return {
            type: TYPE_REQUIRE,
            start: node.start,
            end: node.end,
            spec: node.arguments[0].value,
        };
    }

    const REQUIRE_WALKER = AcornWalk.make({
        CallExpression: (node, state, recurse) => {
            AcornWalk.base[node.type](node, state, recurse);
    
            if (
                node.callee.type === 'Identifier' &&
                node.callee.name === 'require'
            ) {
                if (
                    node.arguments.length !== 1 ||
                    node.arguments[0].type !== 'Literal'
                ) {
                    state.requires.push(createDynamicDependency(node));
                } else {
                    state.requires.push(createStaticDependency(node));
                }
            }
        },
    });

    function findRequires(astOrCode) {
        const ast = parseCode(astOrCode);
        const state = {
            requires: [],
        };
    
        AcornWalk.recursive(ast, state, REQUIRE_WALKER);
    
        return state.requires;
    }

    function addDependencies(webtask, cb) { 
        const nativeModules = node4ModuleList.nativeModuleNames;
        const verquireModules = node4ModuleList.verquireModules;
        const ast = parseCode(webtask.code);
        var dependencies = {};
        const requires = findRequires(ast);

        if (webtask.meta && webtask.meta['wt-node-dependencies']) {
            try {
                dependencies = JSON.parse(webtask.meta['wt-node-dependencies']);
            }
            catch (_) {};
        }

        requires.forEach(require => {
            if (require.type === moduleTypes.TYPE_REQUIRE) {
                const required = parseVerquireSpec(require.spec);
                if (dependencies[required.name]) return;
                const name = required.name;
                let version = required.version;

                if (version === undefined) {
                    if (nativeModules.indexOf(name) !== -1) {
                        return;
                    } else if (
                        Array.isArray(verquireModules[name]) &&
                        verquireModules[name].length
                    ) {
                        version = verquireModules[name][0];
                    }
                }

                dependencies[name] = version;
            }
        });

        if (Object.keys(dependencies).length > 0) {
            webtask.meta['wt-node-dependencies'] = JSON.stringify(dependencies);
        }

        return cb(null, webtask);
    }

    function provisionDependencies(count, webtask, cb) {
        var dependencies = {};
        try {
            dependencies = JSON.parse(webtask.meta['wt-node-dependencies']);
        }
        catch (_) {}
        var modules = [];
        for (var name in dependencies) 
            modules.push({ name, version: dependencies[name] });
        if (modules.length === 0)
            return cb(null, webtask);
        Superagent
            .post(`https://sandbox.auth0-extend.com/api/env/node/modules`)
            .set('Authorization', `Bearer ${options.token}`)
            .send({ modules })
            .end((e,r) => {
                if (e) return cb(e);
                for (var i = 0; i < r.body.length; i++) {
                    if (r.body[i].state === 'queued') {
                        return count === 0
                            ? cb(new Error('Unable to ensure required modules are available before timeout expired'))
                            : setTimeout(() => provisionDependencies(count - 1, webtask, cb), 5000);
                    }
                }
                cb(null, webtask);
            });
    }

    function saveWebtask(webtask, cb) {
        var wt = {
            code: webtask.code
        };
        if (webtask.secrets)
            wt.secrets = webtask.secrets;
        if (webtask.meta)
            wt.meta = webtask.meta;
        
        Superagent
        .put(`https://sandbox.auth0-extend.com/api/webtask/${options.container}/${options.name}`)
        .set('Authorization', `Bearer ${options.token}`)
        .send(wt)
        .end((e,r) => cb(e, r && r.body));
    }

    return Async.waterfall([
        (cb) => Superagent
                    .get(`https://webtask.it.auth0.com/api/webtask/${options.container}/${options.name}`)
                    .query({ decrypt: true, fetch_code: true })
                    .set('Authorization', `Bearer ${options.token}`)
                    .end((e,r) => cb(e, r && r.body)),
        (webtask, cb) => addDependencies(webtask, cb),
        (webtask, cb) => provisionDependencies(6, webtask, cb),
        (webtask, cb) => saveWebtask(webtask, cb),
    ], cb);
}