From 1a1dc97ec89c3a58b56a5b61a875c343e2f929a8 Mon Sep 17 00:00:00 2001
From: Austin Chen <akrolsmir@gmail.com>
Date: Thu, 24 Mar 2022 09:28:36 -0700
Subject: [PATCH] Generate a sitemap with next-sitemap

---
 web/next-sitemap.js | 43 +++++++++++++++++++++++++++++++++++++++++++
 web/package.json    |  4 +++-
 yarn.lock           | 18 ++++++++++++++++++
 3 files changed, 64 insertions(+), 1 deletion(-)
 create mode 100644 web/next-sitemap.js

diff --git a/web/next-sitemap.js b/web/next-sitemap.js
new file mode 100644
index 00000000..3298f52b
--- /dev/null
+++ b/web/next-sitemap.js
@@ -0,0 +1,43 @@
+const https = require('https')
+
+/** @type {import('next-sitemap').IConfig} */
+
+module.exports = {
+  siteUrl: process.env.SITE_URL || 'https://manifold.markets',
+  changefreq: 'hourly',
+  priority: 0.7, // Set high priority by default
+  additionalPaths,
+  exclude: ['/admin'],
+  generateRobotsTxt: true,
+  // Other options: https://github.com/iamvishnusankar/next-sitemap#configuration-options
+}
+
+// See https://github.com/iamvishnusankar/next-sitemap#additional-paths-function
+async function additionalPaths(config) {
+  // Fetching data from https://docs.manifold.markets/api
+  const response = await fetch(`${config.siteUrl}/api/v0/markets`)
+
+  const liteMarkets = await response
+  // See https://www.sitemaps.org/protocol.html
+  return liteMarkets.map((liteMarket) => ({
+    loc: liteMarket.url,
+    changefreq: 'hourly',
+    priority: 0.2, // Individual markets aren't that important
+    // TODO: Add `lastmod` aka last modified time
+  }))
+}
+
+// Polyfill for fetch: get the JSON contents of a URL
+async function fetch(url) {
+  return new Promise((resolve, reject) => {
+    https.get(url, (res) => {
+      let data = ''
+      res.on('data', (chunk) => {
+        data += chunk
+      })
+      res.on('end', () => {
+        resolve(JSON.parse(data))
+      })
+    })
+  })
+}
diff --git a/web/package.json b/web/package.json
index 61342e4d..e5225454 100644
--- a/web/package.json
+++ b/web/package.json
@@ -12,7 +12,8 @@
     "start": "next start",
     "lint": "next lint",
     "format": "npx prettier --write .",
-    "prepare": "cd .. && husky install web/.husky"
+    "prepare": "cd .. && husky install web/.husky",
+    "postbuild": "next-sitemap"
   },
   "dependencies": {
     "@headlessui/react": "1.4.2",
@@ -44,6 +45,7 @@
     "eslint-config-next": "12.0.4",
     "husky": "7.0.4",
     "lint-staged": "12.1.3",
+    "next-sitemap": "^2.5.14",
     "postcss": "8.3.5",
     "prettier": "2.5.0",
     "prettier-plugin-tailwindcss": "^0.1.5",
diff --git a/yarn.lock b/yarn.lock
index 2afa5dda..dc454850 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -72,6 +72,11 @@
     "@babel/helper-validator-identifier" "^7.14.9"
     to-fast-properties "^2.0.0"
 
+"@corex/deepmerge@^2.6.148":
+  version "2.6.148"
+  resolved "https://registry.yarnpkg.com/@corex/deepmerge/-/deepmerge-2.6.148.tgz#8fa825d53ffd1cbcafce1b6a830eefd3dcc09dd5"
+  integrity sha512-6QMz0/2h5C3ua51iAnXMPWFbb1QOU1UvSM4bKBw5mzdT+WtLgjbETBBIQZ+Sh9WvEcGwlAt/DEdRpIC3XlDBMA==
+
 "@eslint/eslintrc@^0.4.3":
   version "0.4.3"
   resolved "https://registry.yarnpkg.com/@eslint/eslintrc/-/eslintrc-0.4.3.tgz#9e42981ef035beb3dd49add17acb96e8ff6f394c"
@@ -4322,6 +4327,11 @@ minimist@^1.1.1, minimist@^1.2.0:
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.5.tgz#67d66014b66a6a8aaa0c083c5fd58df4e4e97602"
   integrity sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==
 
+minimist@^1.2.6:
+  version "1.2.6"
+  resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.6.tgz#8637a5b759ea0d6e98702cfb3a9283323c93af44"
+  integrity sha512-Jsjnk4bw3YJqYzbdyBiNsPWHPfO++UGG749Cxs6peCu5Xg4nrena6OVxOYxrQTqww0Jmwt+Ref8rggumkTLz9Q==
+
 mri@^1.1.5:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/mri/-/mri-1.2.0.tgz#6721480fec2a11a4889861115a48b6cbe7cc8f0b"
@@ -4373,6 +4383,14 @@ netmask@^1.0.6:
   resolved "https://registry.yarnpkg.com/netmask/-/netmask-1.0.6.tgz#20297e89d86f6f6400f250d9f4f6b4c1945fcd35"
   integrity sha1-ICl+idhvb2QA8lDZ9Pa0wZRfzTU=
 
+next-sitemap@^2.5.14:
+  version "2.5.14"
+  resolved "https://registry.yarnpkg.com/next-sitemap/-/next-sitemap-2.5.14.tgz#f196c90d4aef8444c6eb7266875bf2179a515bb7"
+  integrity sha512-aJmxGmoE23NClCi1P6KpHov9DUieF/ZZbfGpTiruOYCq4nKu8Q4masOuswlOl3nNKZa0C3u4JG+TPubjslYH9A==
+  dependencies:
+    "@corex/deepmerge" "^2.6.148"
+    minimist "^1.2.6"
+
 next@12.0.7:
   version "12.0.7"
   resolved "https://registry.yarnpkg.com/next/-/next-12.0.7.tgz#33ebf229b81b06e583ab5ae7613cffe1ca2103fc"