Add authentication sample using web application flow

rest-api/javascript/authentication/web-application-flow/.env.example

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+# Base Url endpoint
+BASE_URL = 'https://api-sandbox.uphold.com'
+
+CLIENT_ID = ''
+CLIENT_SECRET = ''
+SERVER_PORT = 3000

rest-api/javascript/authentication/web-application-flow/.gitignore

@@ -0,0 +1,2 @@
+.env
+node_modules/

rest-api/javascript/authentication/web-application-flow/README.md

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+# Authorization code flow
+
+This sample project demonstrates how a registered app can request authorization from Uphold users to perform actions on their behalf,
+by using the [authorization code OAuth flow](https://oauth.net/2/grant-types/authorization-code/).
+For further background, please refer to the [API documentation](https://uphold.com/en/developer/api/documentation).
+
+## Summary
+
+This flow is **recommended for web applications** that wish to retrieve information about a user's Uphold account,
+or take actions on their behalf.
+
+This process, sometimes called "3-legged OAuth", requires three steps, each initiated by one of the three actors:
+
+1. The **user** navigates to Uphold's website, following an authorization URL generated by the app,
+   where they log in and authorize the app to access their Uphold account;
+2. **Uphold** redirects the user back to the app's website, including a short-lived authorization code in the URL;
+3. The **application**'s server submits this code to Uphold's API, obtaining a long-lived access token in response.
+   (Since this final step occurs in server-to-server communication, the actual code is never exposed to the browser.)
+
+This example sets up a local server that can be used to perform the OAuth web application flow cycle as described above.
+
+## Requirements
+
+To run this example, you must have:
+
+- Node.js v13.14.0 or later
+- An account at <https://sandbox.uphold.com>
+
+## Setup
+
+- Run `npm install` (or `yarn install`)
+- [Create an app on Uphold Sandbox](https://sandbox.uphold.com/dashboard/profile/applications/developer/new)
+  with the redirect URI field set to `https://localhost:3000/callback`
+  (you may use a different port number, if you prefer).
+  Note that this demo expects at least the `user:read` scope to be activated.
+- Create a `.env` file based on the `.env.example` file, and populate it with the required data.
+  Make sure to also update the `SERVER_PORT` if you changed it in the previous step.
+
+## Run
+
+- Run `node index.js`
+- Open the URL printed in the command line.
+  - **Attention:** Since the certificate used in this demo is self-signed, not all browsers will allow navigating to the page.
+    You can use Firefox or Safari, which will display a warning but allow you to proceed regardless.
+    Alternatively, you can navigate to `chrome://flags/#allow-insecure-localhost` in Chromium-based browsers,
+    to toggle support for self-signed localhost certificates.
+- Click the link in the page to navigate to Uphold's servers.
+- Accept the application's permission request.
+
+Once the authorization is complete and an access token is obtained,
+the local server will use it to make a test request to the Uphold API.
+The output will be printed in the command line.

rest-api/javascript/authentication/web-application-flow/authorization-code-flow.js

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+/**
+ * Dependencies.
+ */
+
+import axios from "axios";
+import b64Pkg from "js-base64";
+import dotenv from "dotenv";
+import qs from "qs";
+import path from "path";
+
+const { encode } = b64Pkg;
+
+/**
+ * Dotenv configuration.
+ */
+
+ dotenv.config({ path: path.resolve() + "/.env" });
+
+/**
+ * Compose error page.
+ */
+
+export function composeErrorPage(data, state) {
+  let content = "<h1>Something went wrong.</h1>";
+
+  if (data.state && data.state !== state) {
+    content +=
+      `<p>The received state (<code>${data.state}</code>)
+      does not match the expected value: <code>${state}</code>.</p>`;
+  } else if (Object.values(data).length) {
+    content += "<p>Here's what Uphold's servers returned:</p>";
+    content += `<pre>${JSON.stringify(data, null, 4)}</pre>`;
+  } else {
+    content += "<p>This page should be reached at the end of an OAuth authorization process.</p>";
+    content += "<p>Please confirm that you followed the steps in the README.</p>";
+  }
+
+  return content;
+}
+
+/**
+ * Get assets.
+ */
+
+export async function getAssets(token) {
+  try {
+    const response = await axios.get(`${process.env.BASE_URL}/v0/assets`, {
+      headers: {
+        Authorization: `${token.token_type} ${token.access_token}`,
+      },
+    });
+    return response.data;
+  } catch (error) {
+    console.log(JSON.stringify(error, null, 2));
+    throw error;
+  }
+}
+
+/**
+ * Get Token.
+ */
+
+export async function getToken(code) {
+  // Base64-encoded authentication credentials
+  const auth = encode(process.env.CLIENT_ID + ":" + process.env.CLIENT_SECRET);
+
+  // set POST options for Axios
+  const options = {
+    method: "POST",
+    headers: {
+      Authorization: "Basic " + auth,
+      "content-type": "application/x-www-form-urlencoded",
+    },
+    data: qs.stringify({ code, grant_type: "client_credentials" }),
+    url: `${process.env.BASE_URL}/oauth2/token`,
+  };
+
+  const data = axios(options)
+    .then((response) => {
+      return response.data;
+    })
+    .catch((error) => {
+      error.response.data.errors
+        ? console.log(JSON.stringify(error.response.data.errors, null, 2))
+        : console.log(JSON.stringify(error, null, 2));
+      throw error;
+    });
+
+  return data;
+}

rest-api/javascript/authentication/web-application-flow/cert.pem

@@ -0,0 +1,27 @@
+-----BEGIN CERTIFICATE-----
+MIIEljCCAn4CCQCHHmqArzJctTANBgkqhkiG9w0BAQsFADANMQswCQYDVQQGEwJw
+dDAeFw0yMDEwMjIxMzE1MTlaFw0yMTEwMjIxMzE1MTlaMA0xCzAJBgNVBAYTAnB0
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+Gg6t7OPvwYNi62kS7eywQNbbfIB6wX0h/iw=
+-----END CERTIFICATE-----

rest-api/javascript/authentication/web-application-flow/index.js

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+/**
+ * Dependencies.
+ */
+
+import dotenv from "dotenv";
+import express from "express";
+import fs from "fs";
+import https from "https";
+import path from "path";
+import { randomBytes } from "crypto";
+import { composeErrorPage, getAssets, getToken } from "./authorization-code-flow.js";
+
+/**
+ * Dotenv configuration.
+ */
+
+dotenv.config({ path: path.resolve() + "/.env" });
+
+/**
+ * Server configuration.
+ */
+
+const app = express();
+const port = process.env.SERVER_PORT || 3000;
+const state = randomBytes(8).toString('hex');
+
+/**
+ * Main page.
+ */
+
+app.get("/", async (req, res) => {
+  // Compose the authorization URL. This assumes the `user:read` scope has been activated for this application.
+  const authorizationUrl = 'https://sandbox.uphold.com/authorize/'
+    + process.env.CLIENT_ID
+    + '?scope=user:read'
+    + '&state=' + state;
+
+  res.send(
+    `<h1>Demo app server</h1>
+    <p>Please <a href="${authorizationUrl}">authorize this app</a> on Uphold's Sandbox.</p>`
+  );
+});
+
+
+/**
+ * Callback URL endpoint.
+ */
+
+app.get("/callback", async (req, res) => {
+  // Show an error page if the code wasn't returned or the state doesn't match what we sent.
+  if (!req.query.code || req.query.state !== state) {
+    res.send(composeErrorPage(req.query, state));
+  }
+
+  // Exchange the short-lived authorization code for a long-lived access token.
+  const token = await getToken(req.query.code);
+  console.log(`Authorization code ${req.query.code} successfully exchanged for access token:`, token);
+
+  // Test the new token by making a call to the API.
+  const assets = await getAssets(token);
+  console.log("Output from test API call:", assets[0]);
+
+  res.send(
+    `<h1>Success!</h1>
+    <p>The OAuth authorization code has been successfully exchanged for an access token.</p>`
+  );
+});
+
+/**
+ * Run server.
+ */
+
+https
+  .createServer({
+    key: fs.readFileSync("./key.pem"),
+    cert: fs.readFileSync("./cert.pem"),
+    passphrase: "test",
+  }, app)
+  .listen(port, () => {
+    console.log(`Server running at https://localhost:${port}`);
+  });

rest-api/javascript/authentication/web-application-flow/key.pem

@@ -0,0 +1,54 @@
+-----BEGIN ENCRYPTED PRIVATE KEY-----
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+-----END ENCRYPTED PRIVATE KEY-----