From df7536589df4a711db7b2eefe6b6b65dbe89ef6c Mon Sep 17 00:00:00 2001
From: Michael Bumann <hello@michaelbumann.com>
Date: Tue, 14 May 2019 11:25:21 +0200
Subject: [PATCH] Add helper to initialize a new instance with provider

So far we always had to initialze a provider and signer and pass those
to the kredits constructor.
This helper makes it easier to initialize a default ethers provider and
a default signer.
---
 lib/kredits.js | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/lib/kredits.js b/lib/kredits.js
index d477274..b774e16 100644
--- a/lib/kredits.js
+++ b/lib/kredits.js
@@ -66,6 +66,23 @@ class Kredits {
     return new Kredits(provider, signer, { ipfsConfig: ipfsConfig }).init();
   }
 
+  static for (connectionOptions, kreditsOptions) {
+    const { network, rpcUrl, wallet } = connectionOptions;
+    if (!rpcUrl && network === 'local') { rpcUrl = 'http://localhost:8545'; }
+    let ethProvider, signer;
+    if (rpcUrl || network === 'local') {
+      ethProvider = new ethers.providers.JsonRpcProvider(rpcUrl);
+    } else {
+      ethProvider = new ethers.getDefaultProvider(network);
+    }
+    if (wallet) {
+      signer = wallet.connect(ethProvider);
+    } else if (ethProvider.getSigner) {
+      signer = ethProvider.getSigner();
+   }
+    return new Kredits(ethProvider, signer, kreditsOptions);
+  }
+
   get Kernel () {
     let k = this.contractFor('Kernel');
     // in case we want to use a special apm (e.g. development vs. production)