add generateDelegate function to signerContext (#216)

packages/sdk/src/sign.test.ts

@@ -12,7 +12,12 @@ import { getPublicKey } from 'ethereum-cryptography/secp256k1'
 import { ethers } from 'ethers'
 import { EncryptedData, StreamEvent } from '@river-build/proto'
 import { TEST_ENCRYPTED_MESSAGE_PROPS } from './util.test'
-import { SignerContext, checkDelegateSig, makeSignerContext } from './signerContext'
+import {
+    SignerContext,
+    checkDelegateSig,
+    makeSignerDelegate,
+    makeSignerContext,
+} from './signerContext'
 
 const log = dlog('test:sign')
 
@@ -158,6 +163,23 @@ describe('sign', () => {
         ).not.toThrow()
     })
 
+    test('make-signer-delegate', async () => {
+        const user = keys[0]
+        const userWallet = new ethers.Wallet(user.privateKey)
+
+        const { signerContext, delegateWallet } = await makeSignerDelegate(userWallet)
+
+        expect(signerContext.delegateSig).toBeDefined()
+        expect(() =>
+            checkDelegateSig({
+                delegatePubKey: delegateWallet.publicKey,
+                creatorAddress: user.address,
+                delegateSig: signerContext.delegateSig!,
+                expiryEpochMs: 0n,
+            }),
+        ).not.toThrow()
+    })
+
     const makeContext = async (
         userPrivateKey: string,
         delegatePrivateKey?: string,

packages/sdk/src/signerContext.ts

@@ -101,6 +101,24 @@ export async function makeSignerContext(
     }
 }
 
+export async function makeSignerDelegate(
+    signer: ethers.Signer,
+    expiry?: {
+        days?: number
+        hours?: number
+        minutes?: number
+        seconds?: number
+    },
+): Promise<{ delegateWallet: ethers.Wallet; signerContext: SignerContext }> {
+    const delegateWallet = ethers.Wallet.createRandom()
+    const signerContext = await makeSignerContext(signer, delegateWallet, expiry)
+
+    return {
+        delegateWallet,
+        signerContext,
+    }
+}
+
 function makeExpiryEpochMs({
     days,
     hours,