Add support for account index.

src/app/_helpers/accountIndex.ts

@@ -0,0 +1,47 @@
+import { AccountRegistry } from '../../assets/js/eth_account_index';
+import * as accountIndex from '../../assets/json/accountIndex.abi.json';
+import {environment} from '../../environments/environment';
+const Web3 = require('web3');
+
+const web3 = new Web3(environment.web3Provider);
+// @ts-ignore
+const abi = accountIndex.default;
+
+export class AccountIndex {
+  contractAddress: string;
+  signerAddress: string;
+  contract: any;
+
+  constructor(contractAddress: string, signerAddress?: string) {
+    this.contractAddress = contractAddress;
+    if (signerAddress) {
+      this.signerAddress = signerAddress;
+    }
+    this.contract = new AccountRegistry(web3, abi, this.contractAddress, this.signerAddress);
+  }
+
+  async totalAccounts(): Promise<number> {
+    return await this.contract.count();
+  }
+
+  async haveAccount(address: string): Promise<boolean> {
+    return await this.contract.have(address);
+  }
+
+  async addAccount(address: string): Promise<boolean> {
+    return await this.contract.add(address);
+  }
+
+  async last(numberOfAccounts: number): Promise<Array<string>> {
+    return await this.contract.last(numberOfAccounts);
+  }
+
+  async addToAccountRegistry(address: string): Promise<boolean> {
+    if (!await this.contract.have(address)) {
+      await this.contract.add(address);
+      return await this.contract.have(address);
+    } else {
+      return await this.contract.have(address);
+    }
+  }
+}

src/app/_helpers/http-getter.ts

@@ -0,0 +1,34 @@
+// function httpGetter(): any {
+// }
+//
+// httpGetter().prototype.get = (filename: string) => new Promise((whohoo, doh) => {
+//   const xhr = new XMLHttpRequest();
+//   xhr.addEventListener('load', (e) => {
+//     if (xhr.status === 200) {
+//       whohoo(xhr.responseText);
+//       return;
+//     }
+//     doh('failed with status ' + xhr.status + ': ' + xhr.statusText);
+//   });
+//   xhr.open('GET', filename);
+//   xhr.send();
+// });
+//
+// class HttpGetter {
+//   async get(filename: string): Promise<any> {
+//     const xhr = new XMLHttpRequest();
+//     xhr.addEventListener('load', (e) => {
+//       if (xhr.status === 200) {
+//         // whohoo(xhr.responseText);
+//         return;
+//       }
+//       // doh('failed with status ' + xhr.status + ': ' + xhr.statusText);
+//     });
+//     xhr.open('GET', filename);
+//     xhr.send();
+//   }
+// }
+// export {
+//   httpGetter,
+//   HttpGetter
+// };

src/app/_helpers/index.ts

@@ -1,2 +1,6 @@
 export * from './mock-backend';
 export * from './array-sum';
+export * from './accountIndex';
+export {AccountIndex} from './accountIndex';
+export * from './http-getter';
+