From 2e403c6ebcd8b055d3d933ba2744f98b930efd58 Mon Sep 17 00:00:00 2001
From: bunkerity <contact@bunkerity.com>
Date: Thu, 2 Sep 2021 10:34:58 +0200
Subject: [PATCH] config - add CUSTOM_HEADER

---
 confs/site/custom-headers.conf |  5 +++++
 confs/site/server.conf         |  3 +++
 docs/environment_variables.md  |  6 ++++++
 settings.json                  | 17 +++++++++++++++++
 4 files changed, 31 insertions(+)
 create mode 100644 confs/site/custom-headers.conf

diff --git a/confs/site/custom-headers.conf b/confs/site/custom-headers.conf
new file mode 100644
index 0000000..e2e2bf9
--- /dev/null
+++ b/confs/site/custom-headers.conf
@@ -0,0 +1,5 @@
+{% for k, v in all.items() +%}
+	{% if k.startswith("CUSTOM_HEADER") and v != "" +%}
+more_set_header "{{ v }}";
+	{% endif %}
+{% endfor %}
diff --git a/confs/site/server.conf b/confs/site/server.conf
index 9292b2c..6405404 100644
--- a/confs/site/server.conf
+++ b/confs/site/server.conf
@@ -180,6 +180,9 @@ server {
 	include {{ NGINX_PREFIX }}redirect-to.conf;
 {% endif %}
 
+	# custom headers
+	include {{ NGINX_PREFIX }}custom-headers.conf;
+
 	# reverse proxy
 {% if USE_REVERSE_PROXY == "yes" +%}
 	include {{ NGINX_PREFIX }}reverse-proxy.conf;
diff --git a/docs/environment_variables.md b/docs/environment_variables.md
index 2c736d7..576e516 100644
--- a/docs/environment_variables.md
+++ b/docs/environment_variables.md
@@ -123,6 +123,12 @@ Default value : *no*
 Context : *global*, *multisite*  
 When set to yes and `REDIRECT_TO` is set it will append the requested path to the redirection (e.g., https://example.com/something redirects to https://www.example.com/something).
 
+`CUSTOM_HEADER`  
+Values : *\<HeaderName: HeaderValue\>*  
+Default value :  
+Context : *global*, *multisite*  
+Add custom HTTP header of your choice to clients. You can add multiple headers by appending a number as a suffix of the environment variable : `CUSTOM_HEADER_1`, `CUSTOM_HEADER_2`, `CUSTOM_HEADER_3`, ...
+
 ### Information leak
 
 `SERVER_TOKENS`  
diff --git a/settings.json b/settings.json
index 96bc25a..6a73cbd 100644
--- a/settings.json
+++ b/settings.json
@@ -775,6 +775,23 @@
                 "label": "Content security policy",
                 "regex": "^([\\S ]*)$",
                 "type": "text"
+            },
+            {
+                "id": "custom-headers",
+                "label": "Custom headers",
+                "params" : [
+                    {
+                        "context": "multisite",
+                        "default": "",
+                        "env": "CUSTOM_HEADER",
+                        "id": "custom-headers",
+                        "label": "Custom header",
+                        "multiple": "Custom headers",
+                        "regex": "^([\\S ]*)$",
+                        "type": "text"
+                    }
+                ],
+                "type": "multiple"
             }
         ]
     },