add getSigner back to browser provider

src/providers/provider-browser.ts

@@ -1,11 +1,9 @@
 import { assertArgument } from '../utils/index.js';
 
-import { JsonRpcApiProvider } from './provider-jsonrpc.js';
+import { JsonRpcApiProvider, JsonRpcSigner } from './provider-jsonrpc.js';
 
-import type {
-    JsonRpcError, JsonRpcPayload, JsonRpcResult
-} from "./provider-jsonrpc.js";
-import type { Networkish } from "./network.js";
+import type { JsonRpcError, JsonRpcPayload, JsonRpcResult } from './provider-jsonrpc.js';
+import type { Networkish } from './network.js';
 
 /**
  * The interface to an [EIP-1193](https://eips.ethereum.org/EIPS/eip-1193) provider, which is a standard used by most
@@ -73,6 +71,20 @@ export class BrowserProvider extends JsonRpcApiProvider {
         };
     }
 
+    async hasSigner(address: number | string): Promise<boolean> {
+        if (address == null) {
+            address = 0;
+        }
+
+        const accounts = await this.send('quai_accounts', []);
+        if (typeof address === 'number') {
+            return accounts.length > address;
+        }
+
+        address = address.toLowerCase();
+        return accounts.filter((a: string) => a.toLowerCase() === address).length !== 0;
+    }
+
     async send(method: string, params: Array<any> | Record<string, any>): Promise<any> {
         await this._start();
 
@@ -112,6 +124,25 @@ export class BrowserProvider extends JsonRpcApiProvider {
         return super.getRpcError(payload, error);
     }
 
+    async getSigner(address?: number | string): Promise<JsonRpcSigner> {
+        if (address == null) {
+            address = 0;
+        }
+
+        if (!(await this.hasSigner(address))) {
+            try {
+                //const resp =
+                await this.#request('quai_requestAccounts', []);
+                //console.log("RESP", resp);
+            } catch (error: any) {
+                const payload = error.payload;
+                throw this.getRpcError(payload, { id: payload.id, error });
+            }
+        }
+
+        return await super.getSigner(address);
+    }
+
     /**
      * Resolves to `true` if the provider manages the `address`.
      *