added signing prompts

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}