From c4520e1f3c7fea6d03f36967c4ee72a0df417f2f Mon Sep 17 00:00:00 2001
From: matt-mercer <449892+matt-mercer@users.noreply.github.com>
Date: Wed, 19 Mar 2025 17:05:19 +0000
Subject: [PATCH] basic handling of gzip content-encoding on requests as per
 https://github.com/mendhak/docker-http-https-echo/issues/31 - new test added
 to tests.sh

---
 index.js | 10 ++++++++--
 tests.sh | 12 ++++++++++++
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/index.js b/index.js
index efe71a6..a380bea 100644
--- a/index.js
+++ b/index.js
@@ -7,6 +7,7 @@ const express = require('express')
 const concat = require('concat-stream');
 const { promisify } = require('util');
 const promBundle = require("express-prom-bundle");
+const zlib = require("zlib");
 
 const {
   PROMETHEUS_ENABLED = false,
@@ -40,11 +41,16 @@ if(process.env.DISABLE_REQUEST_LOGS !== 'true'){
 
 app.use(function(req, res, next){
   req.pipe(concat(function(data){
-    req.body = data.toString('utf8');
+
+    if (req.get("Content-Encoding") === "gzip") {
+      req.body = zlib.gunzipSync(data).toString('utf8');
+    }
+    else {
+      req.body = data.toString('utf8');
+    }
     next();
   }));
 });
-
 //Handle all paths
 app.all('*', (req, res) => {
   
diff --git a/tests.sh b/tests.sh
index ecb8785..d56f4e5 100755
--- a/tests.sh
+++ b/tests.sh
@@ -155,6 +155,18 @@ else
     exit 1
 fi
 
+
+message " Make JSON request with gzip Content-Encoding, and test that json is in the output. "
+REQUEST=$(echo -n '{"a":"b"}' | gzip | curl -s -X POST -H "Content-Encoding: gzip" -H "Content-Type: application/json" --data-binary @- http://localhost:8080/)
+if [ $(echo $REQUEST | jq -r '.json.a') == 'b' ]
+then
+    passed "JSON test passed."
+else
+    failed "JSON test failed."
+    echo $REQUEST | jq
+    exit 1
+fi
+
 REQUEST=$(curl -s -X POST -H "Content-Type: application/json" -d 'not-json' http://localhost:8080)
 if [ $(echo $REQUEST | jq -r '.json') == 'null' ]; then
     passed "JSON with Invalid Body test passed."