From c389a233e499b3e6a02ba9962e9c02886be5f21e Mon Sep 17 00:00:00 2001
From: Robert Nagy <ronagy@icloud.com>
Date: Fri, 10 May 2024 21:32:32 +0200
Subject: [PATCH] fix: parseHeaders should take Record<string, ...>

---
 lib/core/util.js | 79 ++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 63 insertions(+), 16 deletions(-)

diff --git a/lib/core/util.js b/lib/core/util.js
index 2bad24df2f6..b06e2f0535b 100644
--- a/lib/core/util.js
+++ b/lib/core/util.js
@@ -273,28 +273,75 @@ function bufferToLowerCasedHeaderName (value) {
 }
 
 /**
- * @param {Record<string, string | string[]> | (Buffer | string | (Buffer | string)[])[]} headers
+ * @param {Record<string, string | string[] | null | undefined> | (Buffer | string | (Buffer | string)[])[]} headers
  * @param {Record<string, string | string[]>} [obj]
  * @returns {Record<string, string | string[]>}
  */
 function parseHeaders (headers, obj) {
-  if (obj === undefined) obj = {}
-  for (let i = 0; i < headers.length; i += 2) {
-    const key = headerNameToString(headers[i])
-    let val = obj[key]
-
-    if (val) {
-      if (typeof val === 'string') {
-        val = [val]
-        obj[key] = val
+  if (obj == null) {
+    obj = {}
+  } else {
+    // TODO (fix): assert obj values?
+  }
+
+  assert(typeof obj === 'object' && obj !== null, 'headers must be an object')
+
+  if (Array.isArray(headers)) {
+    for (let i = 0; i < headers.length; i += 2) {
+      const key2 = headers[i]
+      const val2 = headers[i + 1]
+
+      // TODO (fix): assert key2 type?
+      // TODO (fix): assert val2 type?
+
+      if (!val2) {
+        continue
       }
-      val.push(headers[i + 1].toString('utf8'))
-    } else {
-      const headersValue = headers[i + 1]
-      if (typeof headersValue === 'string') {
-        obj[key] = headersValue
+
+      const key = headerNameToString(key2)
+      let val = obj[key]
+
+      if (val) {
+        if (typeof val === 'string') {
+          val = [val]
+          obj[key] = val
+        }
+
+        if (Array.isArray(val2)) {
+          val.push(...val2.map(x => x.toString()))
+        } else {
+          val.push(val2.toString())
+        }
       } else {
-        obj[key] = Array.isArray(headersValue) ? headersValue.map(x => x.toString('utf8')) : headersValue.toString('utf8')
+        obj[key] = Array.isArray(val2) ? val2.map(x => x.toString()) : val2.toString()
+      }
+    }
+  } else if (typeof headers === 'object' && headers !== null) {
+    for (const key2 of Object.keys(headers)) {
+      const val2 = headers[key2]
+
+      // TODO (fix): assert key2 type?
+      // TODO (fix): assert val2 type?
+
+      if (!val2) {
+        continue
+      }
+
+      const key = headerNameToString(key2)
+      let val = obj[key]
+
+      if (val) {
+        if (typeof val === 'string') {
+          val = [val]
+          obj[key] = val
+        }
+        if (Array.isArray(val2)) {
+          val.push(...val2.map(x => x.toString()))
+        } else {
+          val.push(val2.toString())
+        }
+      } else if (val2 != null) {
+        obj[key] = Array.isArray(val2) ? val2.map(x => x.toString()) : val2.toString()
       }
     }
   }