ubiquity · zugdev · Oct 11, 2024 · Oct 11, 2024 · Oct 11, 2024 · Oct 11, 2024
diff --git a/build/esbuild-build.ts b/build/esbuild-build.ts
@@ -1,5 +1,5 @@
 import esbuild from "esbuild";
-const typescriptEntries = ["static/main.ts"];
+const typescriptEntries = ["src/main.ts"];
 // const cssEntries = ["static/style.css"];
 const entries = [
   ...typescriptEntries,

diff --git a/package.json b/package.json
@@ -30,6 +30,7 @@
     "open-source"
   ],
   "dependencies": {
+    "axios": "^1.7.7",
     "dotenv": "^16.4.4"
   },
   "devDependencies": {

diff --git a/src/fetch-tokens.ts b/src/fetch-tokens.ts
@@ -0,0 +1,62 @@
+// this file fetches token lists accepted by CoW Swap to offer as input options
+import axios from 'axios';
+
+export interface Token {
+  symbol: string;
+  name: string;
+  address: string;
+  decimals: number;
+  chainId: number;
+  logoURI: string;
+}
+
+export interface TokenList {
+  tokens: Token[];
+}
+
+const sources = [
+  {
+    priority: 1,
+    source: 'https://files.cow.fi/tokens/CowSwap.json',
+  },
+  {
+    priority: 2,
+    source: 'https://files.cow.fi/tokens/CoinGecko.json',
+  },
+];
+
+const allowedChainIds = [1]; // only ethereum mainnet for now
+
+/**
+ * fetches accepted tokens in CoW Swap
+ */
+export async function fetchTokens(): Promise<Token[]> {
+  try {
+    const responses = await Promise.all(
+      sources.map((source) => axios.get<TokenList>(source.source))
+    );
+
+    const cowSwapTokens = responses[0].data.tokens;
+    const coinGeckoTokens = responses[1].data.tokens;
+
+    // only store unique tokens, that's why a map
+    const tokenMap = new Map<string, Token>();
+
+    cowSwapTokens.forEach((token) => {
+      if (allowedChainIds.includes(token.chainId)) {
+        tokenMap.set(token.address, token); // map each token by its address if it's on ethereum mainnet
+      }
+    });
+
+    coinGeckoTokens.forEach((token) => {
+      if (allowedChainIds.includes(token.chainId) && !tokenMap.has(token.address)) {
+        tokenMap.set(token.address, token)
+      }
+    });
+
+    return Array.from(tokenMap.values());
+  } catch (error) {
+    console.error('Error fetching token lists:', error);
+    throw new Error('Failed to fetch token lists.');
+  }
+}
diff --git a/src/main.ts b/src/main.ts
@@ -0,0 +1,16 @@
+import { fetchTokens } from "./fetch-tokens"; 
+
+export async function mainModule() {
+  console.log(`Hello from mainModule`);
+
+  try {
+    const tokens = await fetchTokens();
+    console.log('Fetched tokens:', tokens);
+  } catch (error) {
+    console.error('Error fetching tokens:', error);
+  }
+}
+
+mainModule().catch((error) => {
+  console.error('Unhandled error in mainModule:', error);
+});
diff --git a/static/index.html b/static/index.html
@@ -3,11 +3,10 @@
   <head>
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>Ubiquity TypeScript Template</title>
+    <title>Ubiquity On-Ramp</title>
     <link rel="stylesheet" href="style.css" />
   </head>
   <body>
-    <h1>Ubiquity TypeScript Template</h1>
     <script type="module" src="dist/main.js"></script>
   </body>
-</html>
+</html>
diff --git a/static/main.ts b/static/main.ts
diff --git a/tests/main.test.ts b/tests/main.test.ts
@@ -1,4 +1,4 @@
-import { mainModule } from "../static/main";
+import { mainModule } from "../src/main";
 import { db } from "./__mocks__/db";
 import { server } from "./__mocks__/node";
 import usersGet from "./__mocks__/users-get.json";