Merge pull request #1209 from 0xProject/feature/instant/optional-provider

[instant] Provide optional provider API, fallback to injected provider

1 files changed, 16 insertions, 0 deletions

diff --git a/packages/instant/src/util/injected_provider.ts b/packages/instant/src/util/injected_provider.ts
new file mode 100644
index 000000000..40f9e2da5
--- /dev/null
+++ b/packages/instant/src/util/injected_provider.ts
@@ -0,0 +1,16 @@
+import { Provider } from 'ethereum-types';
+import * as _ from 'lodash';
+
+export const getInjectedProvider = (): Provider => {
+    const injectedProviderIfExists = (window as any).ethereum;
+    if (!_.isUndefined(injectedProviderIfExists)) {
+        // TODO: call enable here when implementing wallet connection flow
+        return injectedProviderIfExists;
+    }
+    const injectedWeb3IfExists = (window as any).web3;
+    if (!_.isUndefined(injectedWeb3IfExists.currentProvider)) {
+        return injectedWeb3IfExists.currentProvider;
+    } else {
+        throw new Error(`No injected web3 found`);
+    }
+};