From e2a3c680d1ea2fdac4545f2da2b7d6824c75c300 Mon Sep 17 00:00:00 2001
From: Samuel Andert <samuel@ora.earth>
Date: Mon, 28 Aug 2023 10:39:10 +0200
Subject: [PATCH] added signing prompts

---
 src/lib/GoogleAuth.svelte | 15 ++++---
 src/lib/Signer.svelte     | 92 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 102 insertions(+), 5 deletions(-)
 create mode 100644 src/lib/Signer.svelte

diff --git a/src/lib/GoogleAuth.svelte b/src/lib/GoogleAuth.svelte
index 6874ddb..5963462 100644
--- a/src/lib/GoogleAuth.svelte
+++ b/src/lib/GoogleAuth.svelte
@@ -9,6 +9,7 @@
   import { createLitSession } from "./createLitSession";
   import { connectProvider } from "./setupLit";
   import { ethers } from "ethers";
+  import Signer from "./Signer.svelte";
 
   const redirectUri = "http://localhost:3000/";
 
@@ -194,12 +195,16 @@
     {/if}
     {#if view === "READY"}
       <div>
-        <h3>Your PKP Address: {currentPKP.ethAddress}</h3>
+        <h3>Your PKP Address:</h3>
+        <p>{currentPKP.ethAddress}</p>
         <h1>Ready to sign</h1>
-        <button on:click={signMessageWithPKP}>Sign Message</button>
-        {#if messageToSign}
-          <pre>{JSON.stringify(messageToSign)}</pre>
-        {/if}
+        <Signer
+          {litNodeClient}
+          {currentPKP}
+          {sessionSigs}
+          on:status={(e) => (status = e.detail)}
+          on:error={(e) => setError(e.detail)}
+        />
       </div>
     {/if}
     <div class="mt-4 text-center">
diff --git a/src/lib/Signer.svelte b/src/lib/Signer.svelte
new file mode 100644
index 0000000..8114909
--- /dev/null
+++ b/src/lib/Signer.svelte
@@ -0,0 +1,92 @@
+<!-- SignVerifyMessage.svelte -->
+<script lang="ts">
+  import { ethers } from "ethers";
+  import { createEventDispatcher } from "svelte";
+
+  export let litNodeClient;
+  export let currentPKP;
+  export let sessionSigs;
+  export let messageToSign = { user: "Sam", loggedIn: true };
+
+  let status = "";
+  let jsonObjectToVerify = null;
+
+  const dispatch = createEventDispatcher();
+
+  async function signMessageWithPKP() {
+    const userConfirmed = window.confirm(
+      "Do you want to sign the following message?\n\n" +
+        JSON.stringify(messageToSign, null, 2)
+    );
+
+    if (!userConfirmed) {
+      status = "User did not allow to sign the message.";
+      dispatch("status", status);
+      return;
+    }
+    try {
+      // Create a specific JSON object
+      const jsonString = JSON.stringify(messageToSign);
+
+      // Convert the JSON string to an array of character codes
+      const toSign = ethers.getBytes(ethers.hashMessage(jsonString));
+
+      const litActionCode = `
+          const go = async () => {
+            const sigShare = await LitActions.signEcdsa({ toSign, publicKey, sigName });
+          };
+          go();
+        `;
+
+      // Sign message
+      const results = await litNodeClient.executeJs({
+        code: litActionCode,
+        sessionSigs: sessionSigs,
+        jsParams: {
+          toSign: toSign,
+          publicKey: currentPKP.publicKey,
+          sigName: "sig1",
+        },
+      });
+
+      // Get signature
+      const result = results.signatures["sig1"];
+      const signature = ethers.Signature.from({
+        r: "0x" + result.r,
+        s: "0x" + result.s,
+        v: result.recid,
+      });
+
+      // Add the signature to the JSON object
+      messageToSign.signature = signature;
+
+      jsonObjectToVerify = { ...messageToSign };
+
+      // Display the signed JSON
+      status = JSON.stringify(messageToSign, null, 2);
+
+      // Verify the signature
+      const recoveredAddr = ethers.verifyMessage(jsonString, signature);
+
+      // Check if the address associated with the signature is the same as the current PKP
+      const verified =
+        currentPKP.ethAddress.toLowerCase() === recoveredAddr.toLowerCase();
+
+      if (verified) {
+        status = "The signature is valid.";
+      } else {
+        status = "The signature is invalid.";
+      }
+
+      dispatch("status", status);
+    } catch (err) {
+      console.error(err);
+      dispatch("error", err);
+    }
+  }
+</script>
+
+<button on:click={signMessageWithPKP}>Sign Message</button>
+{#if messageToSign}
+  <pre>{JSON.stringify(messageToSign)}</pre>
+{/if}