From e3f2b910ec993587f4c4e963b7244dd75dd83be7 Mon Sep 17 00:00:00 2001
From: Alicia Sykes <alicia@omg.lol>
Date: Fri, 31 Dec 2021 22:23:39 +0000
Subject: [PATCH] :sparkles: Adds Netlify support for proxying CORS requests

---
 netlify.toml                                  | 90 ++++++++++---------
 services/serverless-functions/netlify-cors.js | 42 +++++++++
 2 files changed, 90 insertions(+), 42 deletions(-)
 create mode 100644 services/serverless-functions/netlify-cors.js

diff --git a/netlify.toml b/netlify.toml
index 6ed4983e..e0062796 100644
--- a/netlify.toml
+++ b/netlify.toml
@@ -1,42 +1,48 @@
-# Enables you to easily deploy a fork of Dashy to Netlify
-# without the need to configure anything in admin UI
-# Docs: https://www.netlify.com/docs/netlify-toml-reference/
-
-# Essential site config
-[build]
-  base = "/"
-  command = "yarn build"
-  publish = "dist"
-  functions = "services/serverless-functions"
-
-# Site info, used for the 1-Click deploy page
-[template.environment]
-  STATUSKIT_PAGE_TITLE = "Dashy"
-  STATUSKIT_COMPANY_LOGO = "https://raw.githubusercontent.com/Lissy93/dashy/master/docs/assets/logo.png"
-  STATUSKIT_SUPPORT_CONTACT_LINK = "https://github.com/lissy93/dashy"
-  STATUSKIT_RESOURCES_LINK = "https://dashy.to/docs"
-
-# Redirect the Node endpoints to serverless functions
-[[redirects]]
-  from = "/status-check"
-  to = "/.netlify/functions/cloud-status-check"
-  status = 301
-  force = true
-[[redirects]]
-  from = "/config-manager/*"
-  to = "/.netlify/functions/not-supported"
-  status = 301
-  force = true
-  
-# For router history mode, ensure pages land on index
-[[redirects]]
-  from = "/*"
-  to = "/index.html"
-  status = 200
-
-# Set any security headers here
-[[headers]]
-  for = "/*"
-  [headers.values]
-  # Uncomment to enable Netlify user control. You must have a paid plan.
-  # Basic-Auth = "someuser:somepassword anotheruser:anotherpassword"
+# Enables you to easily deploy a fork of Dashy to Netlify
+# without the need to configure anything in admin UI
+# Docs: https://www.netlify.com/docs/netlify-toml-reference/
+
+# Essential site config
+[build]
+  base = "/"
+  command = "yarn build"
+  publish = "dist"
+  functions = "services/serverless-functions"
+
+# Site info, used for the 1-Click deploy page
+[template.environment]
+  STATUSKIT_PAGE_TITLE = "Dashy"
+  STATUSKIT_COMPANY_LOGO = "https://raw.githubusercontent.com/Lissy93/dashy/master/docs/assets/logo.png"
+  STATUSKIT_SUPPORT_CONTACT_LINK = "https://github.com/lissy93/dashy"
+  STATUSKIT_RESOURCES_LINK = "https://dashy.to/docs"
+
+# Redirect the Node endpoints to serverless functions
+[[redirects]]
+  from = "/status-check"
+  to = "/.netlify/functions/cloud-status-check"
+  status = 301
+  force = true
+[[redirects]]
+  from = "/config-manager/*"
+  to = "/.netlify/functions/not-supported"
+  status = 301
+  force = true
+[[redirects]]
+  from = "/cors-proxy"
+  to = "/.netlify/functions/netlify-cors"
+  status = 301
+  force = true
+  
+# For router history mode, ensure pages land on index
+[[redirects]]
+  from = "/*"
+  to = "/index.html"
+  status = 200  
+
+# Set any security headers here
+[[headers]]
+  for = "/*"
+  [headers.values]
+  # Uncomment to enable Netlify user control. You must have a paid plan.
+  # Basic-Auth = "someuser:somepassword anotheruser:anotherpassword"
+
diff --git a/services/serverless-functions/netlify-cors.js b/services/serverless-functions/netlify-cors.js
new file mode 100644
index 00000000..eaa7b4b7
--- /dev/null
+++ b/services/serverless-functions/netlify-cors.js
@@ -0,0 +1,42 @@
+/* A Netlify cloud function to handle requests to CORS-disabled services */
+const axios = require('axios');
+
+exports.handler = (event, context, callback) => {
+  // Get URL from header or GET param
+  const requestUrl = event.queryStringParameters.url
+    || event.headers['Target-URL']
+    || event.headers['target-url'];
+
+  // If URL missing, return error
+  if (!requestUrl) {
+    callback(null, {
+      statusCode: 400,
+      body: JSON.stringify({ success: false, msg: 'Missing Target-URL header' }),
+    });
+  }
+
+  // Prepare request
+  const requestConfig = {
+    method: 'GET',
+    url: requestUrl,
+    json: event.body,
+  };
+
+  // Response headers
+  const headers = {
+    'Access-Control-Allow-Origin': '*',
+    ...event.headers,
+  };
+
+  // Make request
+  axios.request(requestConfig)
+    .then((response) => {
+      const body = JSON.stringify(response.data);
+      callback(null, { statusCode: 200, body, headers });
+    }).catch((error) => {
+      callback(null, {
+        statusCode: 400,
+        body: JSON.stringify({ success: false, msg: 'Request failed', error }),
+      });
+    });
+};