paritytech · tadeohepperle · Aug 2, 2023 · May 26, 2023 · May 26, 2023 · May 30, 2023
@@ -8,6 +8,13 @@ edition = "2021"
 [dependencies]
 futures = "0.3.28"
 subxt = { path = "../../subxt", default-features = false, features = ["jsonrpsee", "web"], target_arch = "wasm32" }
-yew = {version = "0.20.0", features = ["csr"] }
+yew = { version = "0.20.0", features = ["csr"] }
 web-sys = "0.3.63"
 hex = "0.4.3"
+yew-router = "0.17.0"
+js-sys = "0.3.63"
+wasm-bindgen = "0.2.86"
+wasm-bindgen-futures = "0.4.36"
+anyhow = "1.0.71"
+serde = "1.0.163"
+serde_json = "1.0.96"
@@ -21,3 +21,6 @@ Then, in another terminal, run the app locally with:
 trunk serve --open
 ```
 
+# signing example
+
+For the signing example, we use the `@polkadot/extension-dapp` NPM package to talk to wallets loaded as browser extensions. In order to sign and submit the transaction using the `polkadot --dev` node we spawned above, you'll need to create a dev account in your wallet of choice. Use the recovery phrase `bottom drive obey lake curtain smoke basket hold race lonely fit walk` and the derivation path `//Alice` to create a dev account that can be used.
@@ -3,6 +3,7 @@
   <head>
     <meta charset="utf-8" />
     <link data-trunk rel="scss" href="index.scss" />
-    <title>Yew App</title>
+    <link data-trunk rel="inline" href="index.js" />
+    <title>Subxt Examples Yew App</title>
   </head>
-</html>
+</html>
@@ -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`";
+    }
+}
@@ -2,56 +2,101 @@ $primary: #24cc85;
 $secondary: #1f624a;
 $dark: #242a35;
 
-*{
-    font-family: monospace;
-    color: $dark;
-
-}
-
-html{
-    background-color: $dark;
-    display: flex;
-    justify-content: center;
-    height: 100%;
-}
-
-h1{
-    font-weight: bolder;
-    color: $dark;
-}
-
-body{
-    width: 800px;
-    max-width: 100%;
-    box-shadow: rgba(0, 0, 0, 0.35) 0px 5px 15px;
-    height: 100%;
-    margin: 0px;
-    padding: 16px;
-    background-color: $primary;
-}
-
-
-p{
-    white-space: pre-wrap;
-    border-radius: 8px;
-    padding: 8px;
-    box-shadow: rgba(0, 0, 0, 0.35) 0px 5px 15px;
-    background-color: $dark;
-    color: white;
-}
-button{
-    font-size: large;
-    padding: 8px 16px;
-    font-weight: bold;
-    background-color: $dark;
-    border: none;
-    border-radius: 8px;
-    color: white;
-    cursor: pointer;
-    display: block;
-    margin-top: 8px;
-}
-
-button:hover{
- background-color: $secondary;
-}
+* {
+  font-family: monospace;
+  color: $dark;
+}
+
+html {
+  background-color: $dark;
+  display: flex;
+  justify-content: center;
+  height: 100%;
+}
+
+h1 {
+  font-weight: bolder;
+  color: $dark;
+}
+
+body {
+  width: 800px;
+  max-width: 100%;
+  box-shadow: rgba(0, 0, 0, 0.35) 0px 5px 15px;
+  min-height: 100%;
+  margin: 0px;
+  padding: 16px;
+  background-color: $primary;
+}
+
+p {
+  white-space: pre-wrap;
+  border-radius: 8px;
+  padding: 8px;
+  box-shadow: rgba(0, 0, 0, 0.35) 0px 5px 15px;
+  background-color: $dark;
+  color: white;
+}
+
+button {
+  font-size: large;
+  padding: 8px 16px;
+  font-weight: bold;
+  background-color: $dark;
+  border: none;
+  border-radius: 8px;
+  color: white;
+  cursor: pointer;
+  display: block;
+  margin-top: 8px;
+}
+
+a {
+  text-decoration: none;
+}
+
+button:hover {
+  background-color: $secondary;
+}
+
+input {
+  font-size: large;
+  background-color: white;
+  color: $dark;
+  border-radius: 8px;
+  padding: 8px;
+}
+
+.mb {
+  margin-bottom: 12px;
+}
+
+small {
+  color: #24cc85;
+}
+
+.error {
+  color: red;
+  background: black;
+  padding: 8px;
+  border-radius: 8px;
+}
+
+@keyframes loading {
+  0% {
+    transform: translateX(0);
+    opacity: 1;
+  }
+  50% {
+    transform: translateX(20px);
+    opacity: 0.5;
+  }
+  100% {
+    transform: translateX(0);
+    opacity: 1;
+  }
+}
+
+.loading {
+  animation: loading 0.7s infinite;
+}