1 files changed, 44 insertions, 0 deletions
diff --git a/packages/website/ts/subproviders/injected_web3_subprovider.ts b/packages/website/ts/subproviders/injected_web3_subprovider.ts
new file mode 100644
index 000000000..b9e5af3ef
--- /dev/null
+++ b/packages/website/ts/subproviders/injected_web3_subprovider.ts
@@ -0,0 +1,44 @@
+import * as _ from 'lodash';
+import Web3 = require('web3');
+import {constants} from 'ts/utils/constants';
+
+/*
+ * This class implements the web3-provider-engine subprovider interface and forwards
+ * requests involving user accounts (getAccounts, sendTransaction, etc...) to the injected
+ * web3 instance in their browser.
+ * Source: https://github.com/MetaMask/provider-engine/blob/master/subproviders/subprovider.js
+ */
+export class InjectedWeb3SubProvider {
+    private injectedWeb3: Web3;
+    constructor(injectedWeb3: Web3) {
+        this.injectedWeb3 = injectedWeb3;
+    }
+    public handleRequest(payload: any, next: () => void, end: (err: Error, result: any) => void) {
+        switch (payload.method) {
+            case 'web3_clientVersion':
+                this.injectedWeb3.version.getNode(end);
+                return;
+            case 'eth_accounts':
+                this.injectedWeb3.eth.getAccounts(end);
+                return;
+
+            case 'eth_sendTransaction':
+                const [txParams] = payload.params;
+                this.injectedWeb3.eth.sendTransaction(txParams, end);
+                return;
+
+            case 'eth_sign':
+                const [address, message] = payload.params;
+                this.injectedWeb3.eth.sign(address, message, end);
+                return;
+
+            default:
+                next();
+                return;
+        }
+    }
+    // Required to implement this method despite not needing it for this subprovider
+    public setEngine(engine: any) {
+        // noop
+    }
+}