helpers and constants

src/constants.js

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+let constants = {};
+constants.organization = 'poanetwork';
+constants.repoName = 'poa-chain-spec';
+constants.addressesSourceFile = 'contracts.json';
+constants.ABIsSources = {
+	'KeysManager': 'KeysManager.abi.json'
+};
+constants.userDeniedTransactionPattern = 'User denied transaction';
+module.exports = {
+  constants
+}

src/helpers.js

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+import { constants } from "./constants";
+import { messages } from "./messages";
+import swal from 'sweetalert';
+
+var toAscii = function(hex) {
+  var str = '',
+      i = 0,
+      l = hex.length;
+  if (hex.substring(0, 2) === '0x') {
+      i = 2;
+  }
+  for (; i < l; i+=2) {
+      var code = parseInt(hex.substr(i, 2), 16);
+      if (code === 0) continue; // this is added
+      str += String.fromCharCode(code);
+  }
+  return str;
+};
+
+function addressesURL(branch) {
+    const URL = `https://raw.githubusercontent.com/${constants.organization}/${constants.repoName}/${branch}/${constants.addressesSourceFile}`;
+    return URL;
+}
+
+function ABIURL(branch, contract) {
+    const URL = `https://raw.githubusercontent.com/${constants.organization}/${constants.repoName}/${branch}/abis/${constants.ABIsSources[contract]}`;
+    return URL;
+}
+
+function getABI(branch, contract) {
+    let addr = ABIURL(branch, contract);
+    return fetch(addr).then(function(response) {
+        return response.json();
+    })
+}
+
+function wrongRepoAlert(addr) {
+    var content = document.createElement("div");
+    content.innerHTML = `<div>
+      Something went wrong!<br/><br/>
+      ${messages.wrongRepo(addr)}
+    </div>`;
+    swal({
+      icon: 'error',
+      title: 'Error',
+      content: content
+    });
+}
+
+function getBranch(netId) {
+    switch (netId) {
+        case '77':
+            return 'sokol'
+        case '99':
+            return 'core'
+        default:
+            return 'core'
+    }
+}
+
+let helpers = {
+  toAscii,
+  addressesURL,
+  ABIURL,
+  getABI,
+  wrongRepoAlert,
+  getBranch
+}
+
+export default helpers
+