From 3ad507a439b9bd6b4e221a0ab18cf400cfd6ea91 Mon Sep 17 00:00:00 2001
From: Fedor Indutny <fedor@indutny.com>
Date: Tue, 20 Apr 2021 12:17:36 -0700
Subject: [PATCH] c-headers: do not list PRI as a valid HTTP method

PRI gets special treatment (parse preamble and error) and even though it
is parsed and allowed after `HTTP/1.x` - it is not technically a method
that could appear in the request parsed with llhttp. Remove the method
from the list of HTTP methods in C headers to prevent confusion and
breakage of `body-parser`.
---
 src/llhttp/c-headers.ts | 4 +++-
 src/llhttp/utils.ts     | 9 ++++++++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/llhttp/c-headers.ts b/src/llhttp/c-headers.ts
index 8aa3444b..717ed6e3 100644
--- a/src/llhttp/c-headers.ts
+++ b/src/llhttp/c-headers.ts
@@ -18,7 +18,9 @@ export class CHeaders {
 
     const errorMap = enumToMap(constants.ERROR);
     const methodMap = enumToMap(constants.METHODS);
-    const httpMethodMap = enumToMap(constants.METHODS, constants.METHODS_HTTP);
+    const httpMethodMap = enumToMap(constants.METHODS, constants.METHODS_HTTP, [
+      constants.METHODS.PRI,
+    ]);
     const rtspMethodMap = enumToMap(constants.METHODS, constants.METHODS_RTSP);
 
     res += this.buildEnum('llhttp_errno', 'HPE', errorMap);
diff --git a/src/llhttp/utils.ts b/src/llhttp/utils.ts
index 950d6228..cb4605b1 100644
--- a/src/llhttp/utils.ts
+++ b/src/llhttp/utils.ts
@@ -2,7 +2,11 @@ export interface IEnumMap {
   [key: string]: number;
 }
 
-export function enumToMap(obj: any, filter?: ReadonlyArray<number>): IEnumMap {
+export function enumToMap(
+  obj: any,
+  filter?: ReadonlyArray<number>,
+  exceptions?: ReadonlyArray<number>,
+): IEnumMap {
   const res: IEnumMap = {};
 
   Object.keys(obj).forEach((key) => {
@@ -13,6 +17,9 @@ export function enumToMap(obj: any, filter?: ReadonlyArray<number>): IEnumMap {
     if (filter && !filter.includes(value)) {
       return;
     }
+    if (exceptions && exceptions.includes(value)) {
+      return;
+    }
     res[key] = value;
   });