From cd41584ac4a90a666f33786d967d37a619c67762 Mon Sep 17 00:00:00 2001
From: Sachin Joshi <satchin.joshi@gmail.com>
Date: Wed, 3 Apr 2019 00:54:16 +0545
Subject: [PATCH] Generate permissive or restrictive robots.txt in the config
 generator

---
 lib/mix/tasks/pleroma/instance.ex    | 34 ++++++++++++++++++++++++++++++++++
 lib/mix/tasks/pleroma/robots_txt.eex |  2 ++
 2 files changed, 36 insertions(+)
 create mode 100644 lib/mix/tasks/pleroma/robots_txt.eex

diff --git a/lib/mix/tasks/pleroma/instance.ex b/lib/mix/tasks/pleroma/instance.ex
index 1ba452275..8f8d86a11 100644
--- a/lib/mix/tasks/pleroma/instance.ex
+++ b/lib/mix/tasks/pleroma/instance.ex
@@ -81,6 +81,14 @@ defmodule Mix.Tasks.Pleroma.Instance do
 
       email = Common.get_option(options, :admin_email, "What is your admin email address?")
 
+      indexable =
+        Common.get_option(
+          options,
+          :indexable,
+          "Do you want search engines to index your site? (y/n)",
+          "y"
+        ) === "y"
+
       dbhost =
         Common.get_option(options, :dbhost, "What is the hostname of your database?", "localhost")
 
@@ -142,6 +150,8 @@ defmodule Mix.Tasks.Pleroma.Instance do
       Mix.shell().info("Writing #{psql_path}.")
       File.write(psql_path, result_psql)
 
+      write_robots_txt(indexable)
+
       Mix.shell().info(
         "\n" <>
           """
@@ -163,4 +173,28 @@ defmodule Mix.Tasks.Pleroma.Instance do
       )
     end
   end
+
+  defp write_robots_txt(indexable) do
+    robots_txt =
+      EEx.eval_file(
+        Path.expand("robots_txt.eex", __DIR__),
+        indexable: indexable
+      )
+
+    static_dir = Pleroma.Config.get([:instance, :static_dir], "instance/static/")
+
+    unless File.exists?(static_dir) do
+      File.mkdir_p!(static_dir)
+    end
+
+    robots_txt_path = Path.join(static_dir, "robots.txt")
+
+    if File.exists?(robots_txt_path) do
+      File.cp!(robots_txt_path, "#{robots_txt_path}.bak")
+      Mix.shell().info("Backing up existing robots.txt to #{robots_txt_path}.bak")
+    end
+
+    File.write(robots_txt_path, robots_txt)
+    Mix.shell().info("Writing #{robots_txt_path}.")
+  end
 end
diff --git a/lib/mix/tasks/pleroma/robots_txt.eex b/lib/mix/tasks/pleroma/robots_txt.eex
new file mode 100644
index 000000000..1af3c47ee
--- /dev/null
+++ b/lib/mix/tasks/pleroma/robots_txt.eex
@@ -0,0 +1,2 @@
+User-Agent: *
+Disallow: <%= if indexable, do: "", else: "/" %>