feat(iframe): implement wallet_getCapabilities method

apps/iframe/src/components/requests/WalletSwitchEthereumChain.tsx

@@ -19,7 +19,7 @@ export const WalletSwitchEthereumChain = ({
     if (import.meta.env.PROD)
         return <RequestDisabled
                 headline={headline}
-                description="The Happy Wallet is an HappyChain exclusive 🤠"
+                description="The Happy Wallet is a HappyChain exclusive 🤠"
                 reject={reject}
             />
 

apps/iframe/src/requests/handlers/injected.ts

@@ -3,12 +3,14 @@ import {
     EIP1193SwitchChainError,
     EIP1193UnauthorizedError,
     EIP1474InvalidInput,
+    HappyWalletCapability,
     type Msgs,
     type ProviderMsgsFromApp,
     WalletType,
 } from "@happy.tech/wallet-common"
+import type { Capabilities } from "viem"
 import { privateKeyToAccount } from "viem/accounts"
-import { checkAndChecksumAddress, checkedTx, checkedWatchedAsset } from "#src/requests/utils/checks"
+import { checkAndChecksumAddress, checkAuthenticated, checkedTx, checkedWatchedAsset } from "#src/requests/utils/checks"
 import { sendToPublicClient, sendToWalletClient } from "#src/requests/utils/sendToClient"
 import {
     getSessionKey,
@@ -25,7 +27,7 @@ import {
     getTransactionReceipt,
 } from "#src/requests/utils/shared"
 import { eoaSigner, sessionKeySigner } from "#src/requests/utils/signers"
-import { getChains, setChains, setCurrentChain } from "#src/state/chains"
+import { getChains, getCurrentChain, setChains, setCurrentChain } from "#src/state/chains"
 import { revokedSessionKeys } from "#src/state/interfaceState"
 import { loadAbiForUser } from "#src/state/loadedAbis"
 import { getPermissions, grantPermissions, revokePermissions } from "#src/state/permissions"
@@ -220,6 +222,34 @@ export async function dispatchInjectedRequest(request: ProviderMsgsFromApp[Msgs.
             return addWatchedAsset(user.address, params)
         }
 
+        case "wallet_getCapabilities": {
+            checkAuthenticated()
+            if (!request.payload?.params?.[0] || !request.payload?.params?.[1]) {
+                throw new EIP1474InvalidInput("Missing payload parameters")
+            }
+            checkAndChecksumAddress(request.payload.params[0])
+
+            const currentChainId = getCurrentChain().chainId
+            if (request.payload.params[1].length > 1) {
+                const requestedChainIds = request.payload.params[1]
+                for (const chainId of requestedChainIds) {
+                    if (chainId !== currentChainId) {
+                        console.warn(
+                            `Unsupported chain ID requested: ${chainId}. The Happy Wallet is a HappyChain exclusive 🤠!`,
+                        )
+                    }
+                }
+            }
+
+            const capabilities: Capabilities = {
+                [currentChainId]: Object.fromEntries(
+                    Object.values(HappyWalletCapability).map((capability) => [capability, { supported: true }]),
+                ),
+            }
+
+            return capabilities
+        }
+
         case HappyMethodNames.LOAD_ABI: {
             return user ? loadAbiForUser(user.address, request.payload.params) : undefined
         }

apps/iframe/src/requests/handlers/permissionless.ts

@@ -1,6 +1,13 @@
 import { HappyMethodNames } from "@happy.tech/common"
-import { EIP1193UserRejectedRequestError, type Msgs, type ProviderMsgsFromApp } from "@happy.tech/wallet-common"
-import { isAddress } from "viem"
+import { isAddress } from "@happy.tech/common"
+import {
+    EIP1193UserRejectedRequestError,
+    EIP1474InvalidInput,
+    type Msgs,
+    type ProviderMsgsFromApp,
+} from "@happy.tech/wallet-common"
+import { HappyWalletCapability } from "@happy.tech/wallet-common"
+import type { Capabilities } from "viem"
 import { sendBoop } from "#src/requests/utils/boop"
 import { checkAndChecksumAddress, checkAuthenticated, checkedTx } from "#src/requests/utils/checks"
 import { sendToPublicClient } from "#src/requests/utils/sendToClient"
@@ -93,6 +100,34 @@ export async function dispatchedPermissionlessRequest(request: ProviderMsgsFromA
             // If this is permissionless, we're already on the right chain so we simply succeed.
             return null
 
+        case "wallet_getCapabilities": {
+            checkAuthenticated()
+            if (!request.payload?.params?.[0] || !request.payload?.params?.[1]) {
+                throw new EIP1474InvalidInput("Missing payload parameters")
+            }
+            checkAndChecksumAddress(request.payload.params[0])
+
+            const currentChainId = getCurrentChain().chainId
+            if (request.payload.params[1].length > 1) {
+                const requestedChainIds = request.payload.params[1]
+                for (const chainId of requestedChainIds) {
+                    if (chainId !== currentChainId) {
+                        console.warn(
+                            `Unsupported chain ID requested: ${chainId}. The Happy Wallet is a HappyChain exclusive 🤠!`,
+                        )
+                    }
+                }
+            }
+
+            const capabilities: Capabilities = {
+                [currentChainId]: Object.fromEntries(
+                    Object.values(HappyWalletCapability).map((capability) => [capability, { supported: true }]),
+                ),
+            }
+
+            return capabilities
+        }
+
         case HappyMethodNames.REQUEST_SESSION_KEY: {
             getCheckedUser()
             const target = checkAndChecksumAddress(request.payload.params[0])

apps/iframe/src/requests/utils/checks.ts

@@ -89,8 +89,8 @@ export function checkedWatchedAsset(params: WatchAssetParameters) {
  * Checks that the address is valid, or throws.
  * @throws EIP1474InvalidInput if the address is invalid
  */
-export function checkAddress(address: string): asserts address is Address {
-    if (!isAddress(address)) throw new EIP1474InvalidInput(`invalid address: ${address}`)
+export function checkAddress(address?: string): asserts address is Address {
+    if (!address || !isAddress(address)) throw new EIP1474InvalidInput(`invalid address: ${address}`)
 }
 
 /**

apps/submitter/bin/benchmarkLatency.ts

@@ -1,11 +1,4 @@
-import {
-    BoopClient,
-    CreateAccount,
-    type ExecuteSuccess,
-    GetNonce,
-    Onchain,
-    computeBoopHash,
-} from "@happy.tech/boop-sdk"
+import { BoopClient, CreateAccount, computeBoopHash } from "@happy.tech/boop-sdk"
 import { delayed, stringify } from "@happy.tech/common"
 import { type PrivateKeyAccount, generatePrivateKey, privateKeyToAccount } from "viem/accounts"
 import { createAndSignMintBoop } from "#lib/utils/test/helpers"

support/wallet-common/lib/index.ts

@@ -26,6 +26,7 @@ export { shortenAddress } from "./utils/shortenAddress"
 export type { Chain, ChainBlockExplorer, ChainContract, ChainRpcUrls, ChainNativeCurrency } from "./chains/viem"
 export { Msgs, WalletDisplayAction } from "./interfaces/events"
 export type { RecordAbiPayload } from "./interfaces/eip1193"
+export { HappyWalletCapability } from "./interfaces/eip5792"
 export type { ChainParameters } from "./chains/utils"
 export type { ConnectionProvider } from "./interfaces/connectionProvider"
 export type { HappyUser } from "./interfaces/happyUser"

support/wallet-common/lib/interfaces/eip5792.ts

@@ -0,0 +1,3 @@
+export enum HappyWalletCapability {
+    BoopPaymaster = "boopPaymaster",
+}

support/wallet-common/lib/interfaces/permissions.ts

@@ -66,6 +66,7 @@ const safeList = new Set([
     "wallet_revokePermissions", // https://github.com/MetaMask/metamask-improvement-proposals/blob/main/MIPs/mip-2.md
     "web3_clientVersion",
     "web3_sha3",
+    "wallet_getCapabilities",
 ])
 
 /**