From 962c4a1d3d8a5c952ec88957bdc20352bbeb151c Mon Sep 17 00:00:00 2001
From: Sidhartha Chatterjee <me@sidharthachatterjee.com>
Date: Thu, 11 Mar 2021 15:27:35 +0530
Subject: [PATCH] fix(gatsby-plugin-netlify): Add an allow list for redirect
 options (#30155)

---
 .../src/create-redirects.js                      | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/packages/gatsby-plugin-netlify/src/create-redirects.js b/packages/gatsby-plugin-netlify/src/create-redirects.js
index efaf6f6c75406..816064bfdbcb8 100644
--- a/packages/gatsby-plugin-netlify/src/create-redirects.js
+++ b/packages/gatsby-plugin-netlify/src/create-redirects.js
@@ -12,8 +12,18 @@ export default async function writeRedirectsFile(
 
   const FILE_PATH = publicFolder(`_redirects`)
 
-  // Map redirect data to the format Netlify expects
   // https://www.netlify.com/docs/redirects/
+  const NETLIFY_REDIRECT_KEYWORDS_ALLOWLIST = [
+    `query`,
+    `conditions`,
+    `headers`,
+    `signed`,
+    `edge_handler`,
+    `Language`,
+    `Country`,
+  ]
+
+  // Map redirect data to the format Netlify expects
   redirects = redirects.map(redirect => {
     const {
       fromPath,
@@ -43,7 +53,9 @@ export default async function writeRedirectsFile(
             `Values should not contain spaces.`
         )
       } else {
-        pieces.push(`${key}=${value}`)
+        if (NETLIFY_REDIRECT_KEYWORDS_ALLOWLIST.includes(key)) {
+          pieces.push(`${key}=${value}`)
+        }
       }
     }