Merge branch 'development' into feature/portal-ledger-support

* development: (437 commits)
  Publish
  Update yarn.lock
  Update the CHANGELOG
  Fix the bug making it impossible to specify the custom ZRX address
  Fix fill/cancel order by looking for NoError instead of empty blockchainErr given the BlockchainErrs type refactor
  Add a comment about a yarn bug
  Add our mainnet and kovan nodes as backups for Portal requests
  Fix bug hiding the user info from topBar
  Add dev-utils package to top level README
  Prettier newline
  Prettier
  Allow Token symbols to be alphanumeric
  Update CHANGELOG, rebase on development
  Should not -> cannot
  Reject negative amounts in isValidBaseUnitAmount
  Re-add changelog for 0x.js
  Fix prettier
  Update yarn.lock
  Move tests to a separate folder
  Change file layout
  ...

# Conflicts:
#	packages/website/README.md

1 files changed, 93 insertions, 0 deletions

diff --git a/packages/kovan-faucets/src/ts/handler.ts b/packages/kovan-faucets/src/ts/handler.ts
new file mode 100644
index 000000000..4bf776264
--- /dev/null
+++ b/packages/kovan-faucets/src/ts/handler.ts
@@ -0,0 +1,93 @@
+import * as express from 'express';
+import * as _ from 'lodash';
+import ProviderEngine = require('web3-provider-engine');
+import HookedWalletSubprovider = require('web3-provider-engine/subproviders/hooked-wallet');
+import NonceSubprovider = require('web3-provider-engine/subproviders/nonce-tracker');
+import RpcSubprovider = require('web3-provider-engine/subproviders/rpc');
+
+import { configs } from './configs';
+import { EtherRequestQueue } from './ether_request_queue';
+import { idManagement } from './id_management';
+import { utils } from './utils';
+import { ZRXRequestQueue } from './zrx_request_queue';
+
+// HACK: web3 leaks XMLHttpRequest into the global scope and causes requests to hang
+// because they are using the wrong XHR package.
+// Filed issue: https://github.com/ethereum/web3.js/issues/844
+// tslint:disable-next-line:ordered-imports
+import * as Web3 from 'web3';
+
+export class Handler {
+    private _etherRequestQueue: EtherRequestQueue;
+    private _zrxRequestQueue: ZRXRequestQueue;
+    private _web3: Web3;
+    constructor() {
+        // Setup provider engine to talk with RPC node
+        const providerObj = this._createProviderEngine(configs.RPC_URL);
+        this._web3 = new Web3(providerObj);
+
+        this._etherRequestQueue = new EtherRequestQueue(this._web3);
+        this._zrxRequestQueue = new ZRXRequestQueue(this._web3);
+    }
+    public dispenseEther(req: express.Request, res: express.Response) {
+        const recipientAddress = req.params.recipient;
+        if (_.isUndefined(recipientAddress) || !this._isValidEthereumAddress(recipientAddress)) {
+            res.status(400).send('INVALID_REQUEST');
+            return;
+        }
+        const lowerCaseRecipientAddress = recipientAddress.toLowerCase();
+        const didAddToQueue = this._etherRequestQueue.add(lowerCaseRecipientAddress);
+        if (!didAddToQueue) {
+            res.status(503).send('QUEUE_IS_FULL');
+            return;
+        }
+        utils.consoleLog(`Added ${lowerCaseRecipientAddress} to the ETH queue`);
+        res.status(200).end();
+    }
+    public dispenseZRX(req: express.Request, res: express.Response) {
+        const recipientAddress = req.params.recipient;
+        if (_.isUndefined(recipientAddress) || !this._isValidEthereumAddress(recipientAddress)) {
+            res.status(400).send('INVALID_REQUEST');
+            return;
+        }
+        const lowerCaseRecipientAddress = recipientAddress.toLowerCase();
+        const didAddToQueue = this._zrxRequestQueue.add(lowerCaseRecipientAddress);
+        if (!didAddToQueue) {
+            res.status(503).send('QUEUE_IS_FULL');
+            return;
+        }
+        utils.consoleLog(`Added ${lowerCaseRecipientAddress} to the ZRX queue`);
+        res.status(200).end();
+    }
+    public getQueueInfo(req: express.Request, res: express.Response) {
+        res.setHeader('Content-Type', 'application/json');
+        const payload = JSON.stringify({
+            ether: {
+                full: this._etherRequestQueue.isFull(),
+                size: this._etherRequestQueue.size(),
+            },
+            zrx: {
+                full: this._zrxRequestQueue.isFull(),
+                size: this._zrxRequestQueue.size(),
+            },
+        });
+        res.status(200).send(payload);
+    }
+    // tslint:disable-next-line:prefer-function-over-method
+    private _createProviderEngine(rpcUrl: string) {
+        const engine = new ProviderEngine();
+        engine.addProvider(new NonceSubprovider());
+        engine.addProvider(new HookedWalletSubprovider(idManagement));
+        engine.addProvider(
+            new RpcSubprovider({
+                rpcUrl,
+            }),
+        );
+        engine.start();
+        return engine;
+    }
+    private _isValidEthereumAddress(address: string): boolean {
+        const lowercaseAddress = address.toLowerCase();
+        return this._web3.isAddress(lowercaseAddress);
+    }
+}