From 7fddc84ec02f4827fe7a20f5172d2716e254bda6 Mon Sep 17 00:00:00 2001
From: Bruce BUJON <PerfectSlayer@users.noreply.github.com>
Date: Tue, 26 Oct 2021 10:12:31 +0200
Subject: [PATCH] feat: Add hosts validation action

---
 .github/workflows/hosts-validation.yml | 38 ++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 .github/workflows/hosts-validation.yml

diff --git a/.github/workflows/hosts-validation.yml b/.github/workflows/hosts-validation.yml
new file mode 100644
index 0000000..ae46b80
--- /dev/null
+++ b/.github/workflows/hosts-validation.yml
@@ -0,0 +1,38 @@
+name: Hosts Validation
+
+on:
+  push:
+    paths:
+      - hotst.txt
+  pull_request:
+    paths:
+      - hotst.txt
+
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Validate hosts file
+        run: |
+          input="hosts.txt"
+          debug=false
+          while IFS= read -r line
+          do
+              if [[ "$line" =~ ^\# ]]; then
+                  $debug && echo "$line is a comment"
+              elif [[ "$line" = "" ]]; then
+                  $debug && echo "line is empty"
+              elif [[ "$line" =~ ^127\.0\.0\.1 ]] || [[ "$line" =~ ^::1 ]]; then
+                  $debug && echo "$line is an allowed redirection"
+              else
+                  echo "$line is not an allowed redirection"
+                  echo "Only redirection to the loopback interface is allowed (127.0.0.1 for IPv4 or ::1 for IPv6)"
+                  exit 1
+              fi
+          done < "$input"
+          echo "Hosts file is valid"