feat: ability to install snap

package.json

@@ -39,13 +39,16 @@
   ],
   "license": "MIT",
   "dependencies": {
+    "@metamask/providers": "^9.1.0",
     "@types/chai-as-promised": "^7.1.5",
     "chai-as-promised": "^7.1.1",
     "node-stream-zip": "^1.13.0"
   },
   "devDependencies": {
     "@chainsafe/eslint-config": "^1.0.0",
     "@jest/types": "^27.1.1",
+    "@metamask/snap-types": "^0.22.0",
+    "@metamask/snaps-cli": "^0.22.0",
     "@rushstack/eslint-patch": "^1.2.0",
     "@types/chai": "^4.2.22",
     "@types/mocha": "^9.1.1",

src/snap/index.ts

@@ -0,0 +1,2 @@
+export { flaskOnly } from "./utils";
+export { installSnap } from "./install";

src/snap/install.ts

@@ -0,0 +1,88 @@
+import { MetaMaskInpageProvider } from "@metamask/providers";
+import { Page } from "puppeteer";
+import {
+  clickOnButton,
+  clickOnElement,
+  clickOnLogo,
+  openProfileDropdown,
+} from "../helpers";
+import { flaskOnly } from "./utils";
+
+declare let window: { ethereum: MetaMaskInpageProvider };
+
+export type InstallStep = (page: Page) => Promise<void>;
+
+export async function installSnap(
+  page: Page,
+  snapId: string,
+  opts: {
+    hasPermissions: boolean;
+    hasKeyPermissions: boolean;
+    customSteps?: InstallStep[];
+    version?: string;
+  }
+): Promise<void> {
+  flaskOnly(page);
+  //need to open page to access window.ethereum
+  const installPage = await page.browser().newPage();
+  await installPage.goto("https://google.com");
+  await installPage.evaluate(
+    (opts: { snapId: string; version?: string }) => {
+      void window.ethereum.request({
+        method: "wallet_enable",
+        params: [
+          {
+            [`wallet_snap_${opts.snapId}`]: {
+              version: opts.version ?? "latest",
+            },
+          },
+        ],
+      });
+    },
+    { snapId, version: opts.version }
+  );
+  await installPage.close({ runBeforeUnload: true });
+  await page.bringToFront();
+  await page.reload();
+  await clickOnButton(page, "Connect");
+  if (opts.hasPermissions) {
+    await clickOnButton(page, "Approve & install");
+    if (opts.hasKeyPermissions) {
+      const checkbox = await page.waitForSelector(".checkbox-label", {
+        visible: true,
+      });
+      await checkbox.click();
+      await clickOnButton(page, "Confirm");
+    }
+  } else {
+    await clickOnButton(page, "Install");
+  }
+  for (const step of opts.customSteps ?? []) {
+    await step(page);
+  }
+  if (!(await isSnapInstalled(page, snapId))) {
+    throw new Error("Failed to install snap " + snapId);
+  }
+}
+
+export async function isSnapInstalled(
+  page: Page,
+  snapId: string
+): Promise<boolean> {
+  await page.bringToFront();
+  await openProfileDropdown(page);
+
+  await clickOnElement(page, "Settings");
+  await clickOnElement(page, "Snaps");
+  let found = false;
+  try {
+    await page.waitForXPath(`//*[contains(text(), '${snapId}')]`, {
+      timeout: 5000,
+    });
+    found = true;
+  } catch (e) {
+    found = false;
+  }
+  await clickOnLogo(page);
+  return found;
+}

src/snap/utils.ts

@@ -0,0 +1,10 @@
+import { Page } from "puppeteer";
+import { DappeteerBrowser } from "../setup";
+
+export function flaskOnly(page: Page): void {
+  if ((page.browser() as DappeteerBrowser).flask == null) {
+    throw new Error(
+      "This method is only available when running Metamask Flask"
+    );
+  }
+}

test/constant.ts

@@ -1,17 +1,17 @@
 import http from "http";
 
 import { Provider, Server } from "ganache";
-import { Browser } from "puppeteer";
 
-import { Dappeteer } from "../src";
+import { Dappeteer, DappeteerBrowser } from "../src";
 
-import { Contract } from "./deploy";
+import { Contract, Snaps } from "./deploy";
 
 export type InjectableContext = Readonly<{
   provider: Provider;
   ethereum: Server<"ethereum">;
   testPageServer: http.Server;
-  browser: Browser;
+  snapServers?: Record<Snaps, http.Server>;
+  browser: DappeteerBrowser;
   metamask: Dappeteer;
   contract: Contract;
   flask: boolean;

test/deploy.ts

@@ -7,6 +7,7 @@ import handler from "serve-handler";
 import Web3 from "web3";
 
 import { compileContracts } from "./contract";
+import { toUrl } from "./utils/utils";
 
 const counterContract: { address: string } | null = null;
 
@@ -77,3 +78,49 @@ export async function startTestServer(): Promise<http.Server> {
   });
   return server;
 }
+
+export enum Snaps {
+  BASE_SNAP = "base-snap",
+  KEYS_SNAP = "keys-snap",
+  PERMISSIONS_SNAP = "permissions-snap",
+}
+
+export async function startSnapServers(): Promise<Record<Snaps, http.Server>> {
+  return {
+    [Snaps.BASE_SNAP]: await startSnapServer(Snaps.BASE_SNAP),
+    [Snaps.KEYS_SNAP]: await startSnapServer(Snaps.KEYS_SNAP),
+    [Snaps.PERMISSIONS_SNAP]: await startSnapServer(Snaps.PERMISSIONS_SNAP),
+  };
+}
+
+async function startSnapServer(snap: Snaps): Promise<http.Server> {
+  console.log(`Starting ${snap} server...`);
+  const server = http.createServer((req, res) => {
+    void handler(req, res, {
+      public: path.resolve(__dirname, `./flask/${snap}`),
+      headers: [
+        {
+          source: "**/*",
+          headers: [
+            {
+              key: "Cache-Control",
+              value: "no-cache",
+            },
+            {
+              key: "Access-Control-Allow-Origin",
+              value: "*",
+            },
+          ],
+        },
+      ],
+    });
+  });
+
+  await new Promise<void>((resolve) => {
+    server.listen(0, () => {
+      console.log(`Server for ${snap} running at `, toUrl(server.address()));
+      resolve();
+    });
+  });
+  return server;
+}

test/flask/base-snap/index.html

@@ -0,0 +1,65 @@
+<!doctype html>
+<html>
+  </head>
+    <title>Hello, Snaps!</title>
+    <link rel="icon" type="image/svg" href="./images/icon.svg"/>
+  </head>
+
+  <body>
+    <h1>Hello, Snaps!</h1>
+    <details>
+      <summary>Instructions</summary>
+      <ul>
+        <li>First, click "Connect". Then, try out the other buttons!</li>
+        <li>Please note that:</li>
+        <ul>
+          <li>
+            The <code>snap.manifest.json</code> and <code>package.json</code> must be located in the server root directory...
+          </li>
+          <li>
+            The Snap bundle must be hosted at the location specified by the <code>location</code> field of <code>snap.manifest.json</code>.
+          </li>
+        </ul>
+      </ul>
+    </details>
+    <br/>
+
+    <button class="connect">Connect</button>
+    <button class="sendHello">Send Hello</button>
+  </body>
+
+  <script>
+    const snapId = `local:${window.location.href}`;
+
+    const connectButton = document.querySelector('button.connect')
+    const sendButton = document.querySelector('button.sendHello')
+
+    connectButton.addEventListener('click', connect)
+    sendButton.addEventListener('click', send)
+
+    // here we get permissions to interact with and install the snap
+    async function connect () {
+      await ethereum.request({
+        method: 'wallet_enable',
+        params: [{
+          wallet_snap: { [snapId]: {} },
+        }]
+      })
+    }
+
+    // here we call the snap's "hello" method
+    async function send () {
+      try {
+        await ethereum.request({
+          method: 'wallet_invokeSnap',
+          params: [snapId, {
+            method: 'hello'
+          }]
+        })
+      } catch (err) {
+        console.error(err)
+        alert('Problem happened: ' + err.message || err)
+      }
+    }
+  </script>
+</html>

test/flask/base-snap/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "base-snap",
+  "version": "1.0.0",
+  "description": "",
+  "main": "src/index.ts",
+  "scripts": {
+    "prefix": "mm-snap build",
+    "fix": "mm-snap manifest --fix"
+  },
+  "devDependencies": {
+    "@metamask/snaps-cli": "^0.22.0"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@metamask/snap-types": "^0.22.0"
+  }
+}

test/flask/base-snap/snap.config.js

@@ -0,0 +1,6 @@
+module.exports = {
+  cliOptions: {
+    src: './src/index.ts',
+    port: 8080,
+  },
+};

test/flask/base-snap/snap.manifest.json

@@ -0,0 +1,17 @@
+{
+  "version": "1.0.0",
+  "description": "An example Snap written in TypeScript.",
+  "proposedName": "Base Snap\n",
+  "source": {
+    "shasum": "sApNS/DJjjs8psniSQzWlOdkzJ75IsbtlpdipfKarRI=",
+    "location": {
+      "npm": {
+        "filePath": "dist/bundle.js",
+        "packageName": "base-snap",
+        "registry": "https://registry.npmjs.org/"
+      }
+    }
+  },
+  "initialPermissions": {},
+  "manifestVersion": "0.1"
+}

test/flask/base-snap/src/index.ts

@@ -0,0 +1,21 @@
+import { OnRpcRequestHandler } from "@metamask/snap-types";
+
+export const onRpcRequest: OnRpcRequestHandler = ({ origin, request }) => {
+  switch (request.method) {
+    case "hello":
+      return wallet.request({
+        method: "snap_confirm",
+        params: [
+          {
+            prompt: `Hello, ${origin}!`,
+            description:
+              "This custom confirmation is just for display purposes.",
+            textAreaContent:
+              "But you can edit the snap source code to make it do something, if you want to!",
+          },
+        ],
+      });
+    default:
+      throw new Error("Method not found.");
+  }
+};