fix(local rate limits): Skipping basic auth and rate limits with an env var

src/app.js

@@ -96,17 +96,26 @@ app.use('/', logReqInfo)
 
 const v4prefix = 'v4'
 
+// START Rate Limits
+// Allow users to turn off rate limits with an environment variable.
+const USE_RATE_LIMITS = process.env.USE_RATE_LIMITS
+  ? process.env.USE_RATE_LIMITS
+  : true
+const auth = new AuthMW()
+
+if (USE_RATE_LIMITS) {
   // Inspect the header for a JWT token.
   app.use(`/${v4prefix}/`, jwtAuth.getTokenFromHeaders)
 
   // Instantiate the authorization middleware, used to implement pro-tier rate limiting.
   // Handles Anonymous and Basic Authorization schemes used by passport.js
-const auth = new AuthMW()
   app.use(`/${v4prefix}/`, auth.mw())
 
   // Rate limit on all v4 routes
   // Establish and enforce rate limits.
   app.use(`/${v4prefix}/`, rateLimits.rateLimitByResource)
+}
+// END Rate Limits
 
 // Connect v4 routes
 app.use(`/${v4prefix}/` + 'health-check', healthCheckV4)

src/middleware/auth.js

@@ -1,22 +1,25 @@
 /*
-  CT 2/4/20 Note: This library handles anonymous and Basic auth. This library
-  can be phased out with the chage to JWT tokens and the new rate-limit library.
-
-  Handle authorization for bypassing rate limits.
+  This library handles anonymous and Basic Authentication.
 
   1) Default is 'Anonymous Authentication', which unlocks the freemimum tier by
   default.
+
   2) Hard-coded 'Basic Authentication' is a token that does not expire and is
-  provided to buisiness partners.
+  provided for clients who run their own isolated infrastructure without rate
+  limits, but still need a way from preventing the random public from using
+  their API.
+
   3) JWT-based 'Local Authentication' is used for normal users that pay to
   access the premium pro-tier services.
 
   This file uses the passport npm library to check the header of each REST API
-  call for the prescence of a Basic authorization header:
+  call for the prescence of a Basic Authentication header:
   https://en.wikipedia.org/wiki/Basic_access_authentication
 
   If the header is found and validated, the req.locals.proLimit Boolean value
-  is set and passed to the route-ratelimits.ts middleware.
+  is set and passed to the route-ratelimit.js middleware. route-ratelimit.js
+  is for fine-grain JWT-based rate limits. If req.locals.proLimit is set to
+  true, then those rate limits will be skipped.
 */
 
 'use strict'
@@ -76,8 +79,9 @@ class AuthMW {
         req.locals.proLimit = false
 
         // Evaluate the username and password and set the rate limit accordingly.
-        // if (username === "BITBOX" && password === PRO_PASS) {
         if (username === 'fullstackcash') {
+          // Can set several different passwords in the environment variable.
+          // Loop through each one to see if one matches.
           for (let i = 0; i < PRO_PASS.length; i++) {
             const thisPass = PRO_PASS[i]
 

src/middleware/route-ratelimit2.js

@@ -0,0 +1,103 @@
+/*
+This file will replace the original rate-limit.js file.
+
+Sets the rate limits for the anonymous and paid tiers. Current rate limits:
+- 1000 points in 60 seconds
+- 10 points per call for paid tier (100 RPM)
+- 50 points per call for anonymous tier (20 RPM)
+
+The rate limit handling is designed for these four use cases:
+- Users who want to buy a JWT token for 24 hour access.
+- Users who want to buy different RPM tiers: 100, 250, 600
+- Basic Authentication which should not have any rate limits applied.
+
+The Basci Auth use cases is considered when determining internal rate limits.
+The internal rate limits should not be applied to calls from those users.
+
+A lot of attention has been paid to passing rate-limit information for the user
+when they trigger an endpoint that makes a lot of internal API calls. Examples
+are hydrateUtxos() and getPublicKey().
+*/
+
+// Public npm libraries.
+const jwt = require('jsonwebtoken')
+const Redis = require('ioredis')
+const { RateLimiterRedis } = require('rate-limiter-flexible')
+
+// local libraries.
+// const wlogger = require('../util/winston-logging')
+const config = require('../../config')
+
+// let _this // Global pointer to instance of class, when 'this' context is lost.
+
+// Setup Redis to track rate limits for each user.
+const redisOptions = {
+  enableOfflineQueue: false,
+  port: process.env.REDIS_PORT ? process.env.REDIS_PORT : 6379,
+  host: process.env.REDIS_HOST ? process.env.REDIS_HOST : '127.0.0.1'
+}
+console.log(`redisOptions: ${JSON.stringify(redisOptions, null, 2)}`)
+const redisClient = new Redis(redisOptions)
+const rateLimitOptions = {
+  storeClient: redisClient,
+  points: 1000, // Number of points
+  duration: 60 // Per minute (per 60 seconds)
+}
+
+// Constants
+// const ANON_LIMITS = config.anonRateLimit
+// const WHITELIST_RATE_LIMIT = config.whitelistRateLimit
+// const WHITELIST_DOMAINS = config.whitelistDomains
+// const INTERNAL_RATE_LIMIT = 1
+
+class RateLimits {
+  constructor () {
+    // _this = this
+
+    this.jwt = jwt
+    this.rateLimiter = new RateLimiterRedis(rateLimitOptions)
+    this.config = config
+  }
+
+  // This is the main middleware funciton of this library. All other functions
+  // support this function.
+  async applyRateLimits (req, res, next) {
+    try {
+      // let userId
+      // let decoded = {}
+
+      // Create a re*Q*.locals object if not passed in.
+      // req.locals.proLimit will be true if the user is using Basic Authentication.
+      if (!req.locals) {
+        req.locals = {
+          // default values
+          jwtToken: '',
+          proLimit: false,
+          apiLevel: 0
+        }
+      }
+
+      // Create a re*S*.locals object if it does not exist.
+      if (!res.locals) {
+        res.locals = {
+          rateLimitTriggered: false
+        }
+      }
+    } catch (err) {
+
+    }
+  }
+
+  // Used to disconnect from the Redis DB.
+  // Called by unit tests so that node.js thread doesn't live forever.
+  closeRedis () {
+    redisClient.disconnect()
+  }
+
+  // Clear the redis database. Used by unit tests.
+  async wipeRedis () {
+    await redisClient.flushdb()
+  }
+}
+
+module.exports = RateLimits