fix: Convert vendor/pezkuwi-subxt from submodule to regular directory

vendor/pezkuwi-subxt/examples/wasm-example/index.js

@@ -0,0 +1,89 @@
+/**
+ * The `@polkadot/extension-dapp` package can be dynamically imported.
+ * Usually it is wise to use a package manager like npm or yarn to install it as a dependency.
+ *
+ * The `getPolkadotJsExtensionMod` closure returns the `@polkadot/extension-dapp` module on demand.
+ */
+let getPolkadotJsExtensionMod = (() => {
+    let mod = null;
+
+    // initialize `@polkadot/extension-dapp` module on page load
+    let initPromise = (async () => {
+        mod = await import(
+            "https://cdn.jsdelivr.net/npm/@polkadot/extension-dapp@0.46.3/+esm"
+            );
+    })();
+
+    // return a function that waits for initialization to be finished, in case mod is not initialized yet.
+    return async () => {
+        if (mod == null) {
+            await initPromise;
+        }
+        return mod;
+    };
+})();
+
+/**
+ *  Queries wallets from browser extensions like Talisman and the Polkadot.js extension for user accounts.
+ *
+ *  @returns a json string that contains all the accounts that were found.
+ */
+async function getAccounts() {
+    const extensionMod = await getPolkadotJsExtensionMod();
+    await extensionMod.web3Enable("Subxt Example App");
+    const allAccounts = await extensionMod.web3Accounts();
+    const accountObjects = allAccounts.map((account) => ({
+        name: account.meta.name, // e.g. "Alice"
+        source: account.meta.source, // e.g. "talisman", "polkadot-js"
+        ty: account.type, // e.g. "sr25519"
+        address: account.address // e.g. "5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY"
+    }));
+    console.log(accountObjects);
+    return JSON.stringify(accountObjects);
+}
+
+/**
+ * Signs a payload via browser extension
+ *
+ * @param payloadAsStr a string representing a JSON object like this:
+ * let payload = {
+ *     "specVersion": "0x000024d6",
+ *     "transactionVersion": "0x00000018",
+ *     "address": "5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY",
+ *     "blockHash": "0xd7aad6185db012b7ffbce710b55234d6c9589170566b925ee50cfa3d7f1e6f8f",
+ *     "blockNumber": "0x00000000",
+ *     "era": "0x0000",
+ *     "genesisHash": "0xd7aad6185db012b7ffbce710b55234d6c9589170566b925ee50cfa3d7f1e6f8f",
+ *     "method": "0x0503001cbd2d43530a44705ad088af313e18f80b53ef16b36177cd4b77b846f2a5f07c0b00c465f14670",
+ *     "nonce": "0x00000000",
+ *     "signedExtensions": [
+ *         "CheckNonZeroSender",
+ *         "CheckSpecVersion",
+ *         "CheckTxVersion",
+ *         "CheckGenesis",
+ *         "CheckMortality",
+ *         "CheckNonce",
+ *         "CheckWeight",
+ *         "ChargeTransactionPayment",
+ *         "PrevalidateAttests"
+ *     ],
+ *     "tip": "0x00000000000000000000000000000000",
+ *     "version": 4
+ * };
+ * @param source the extension used for signing as a string
+ * @param address the ss58 encoded address as a string
+ * @returns {Promise<*>}
+ */
+async function signPayload(payloadAsStr, source, address) {
+    let payload = JSON.parse(payloadAsStr);
+    const extensionMod = await getPolkadotJsExtensionMod();
+    const injector = await extensionMod.web3FromSource(source);
+    const signPayload = injector?.signer?.signPayload;
+    if (!!signPayload) {
+        const {signature} = await signPayload(payload);
+        console.log("signature js:", signature)
+        return signature;
+    } else {
+        throw "The extension's injector does not have a `signPayload` function on its `signer`";
+    }
+}