refactor REDIRECT_PROTO and add some examples

Dockerfile

@@ -35,7 +35,7 @@ ENV REDIRECT_CODE=302
 
 # And the protocol we should redirect to. Change this to "https" if you
 # serve via https (e.g. with a SSL-termination proxy infront of this)
-ENV REDIRECT_SCHEME="http"
+ENV REDIRECT_PROTO="auto"
 
 ADD etc/ /etc/
 ADD usr/ /usr/

etc/nginx/sites-available/redirect-apex-to-www.conf

@@ -1,5 +0,0 @@
-server {
-    listen 80;
-    server_name ~^(?!www.)(?<domain>.+)$;
-    return {{REDIRECT_CODE}} {{REDIRECT_SCHEME}}://www.$domain$request_uri;
-}

etc/nginx/sites-available/redirect-apex-to-www.conf.tpl

@@ -0,0 +1,6 @@
+server {
+    listen 80;
+    server_name ~^(?!www.)(?<domain>.+)$;
+
+    return {{REDIRECT_CODE}} {{REDIRECT_PROTO}}://www.$domain$request_uri;
+}

etc/nginx/sites-available/redirect-www-to-apex.conf

@@ -1,5 +0,0 @@
-server {
-    listen 80;
-    server_name ~^www.(?<domain>.+)$;
-    return {{REDIRECT_CODE}} {{REDIRECT_SCHEME}}://$domain$request_uri;
-}

etc/nginx/sites-available/redirect-www-to-apex.conf.tpl

@@ -0,0 +1,5 @@
+server {
+    listen 80;
+    server_name ~^www.(?<domain>.+)$;
+    return {{REDIRECT_CODE}} {{REDIRECT_PROTO}}://$domain$request_uri;
+}

examples/phpinfo-behind-https/Caddyfile

@@ -0,0 +1,7 @@
+https://* {
+    errors stderr
+    tls self_signed
+    proxy / http://backend:80 {
+        transparent
+    }
+}

examples/phpinfo-behind-https/docker-compose.yml

@@ -0,0 +1,13 @@
+version: '3'
+services:
+    backend:
+        build: ../../
+        volumes:
+        - './index.php:/var/www/index.php'
+
+    frontend:
+        image: abiosoft/caddy
+        volumes:
+        - './Caddyfile:/etc/Caddyfile'
+        ports:
+        - '443:443'

examples/phpinfo-behind-https/index.php

@@ -0,0 +1,3 @@
+<?php
+
+phpinfo();

examples/phpinfo/docker-compose.yml

@@ -0,0 +1,8 @@
+version: '3'
+services:
+    backend:
+        build: ../../
+        volumes:
+        - './index.php:/var/www/index.php'
+        ports:
+        - '80:80'

examples/phpinfo/index.php

@@ -0,0 +1,3 @@
+<?php
+
+phpinfo();

usr/bin/docker-start

@@ -1,25 +1,31 @@
 #!/usr/bin/env sh
 set -eu
 
-chown www-data.www-data "${DOCUMENT_ROOT}"
-
-for file in /etc/nginx/*/*.conf; do
-    sed -i \
-        -e "s#{{REDIRECT_CODE}}#${REDIRECT_CODE}#g" \
-        -e "s#{{DOCUMENT_ROOT}}#${DOCUMENT_ROOT}#g" \
-        -e "s#{{REDIRECT_SCHEME}}#${REDIRECT_SCHEME}#g" \
-        "${file}"
-done
-
-rm -f /etc/nginx/sites-enabled/redirect-*.conf
-if [[ "${REDIRECT_MODE}" == "apex-to-www" ]]; then
-    ln -s \
-        /etc/nginx/sites-available/redirect-apex-to-www.conf \
-        /etc/nginx/sites-enabled/redirect-apex-to-www.conf
-elif [[ "${REDIRECT_MODE}" == "www-to-apex" ]]; then
-    ln -s \
-        /etc/nginx/sites-available/redirect-www-to-apex.conf \
-        /etc/nginx/sites-enabled/redirect-www-to-apex.conf
+# Properly detect requested redirect
+if [ "${REDIRECT_PROTO}" == "auto" ]; then
+    REDIRECT_PROTO="\$http_x_forwarded_proto";
+elif [ "${REDIRECT_PROTO}" != "http" ] && [ "${REDIRECT_PROTO}" != "https" ]; then
+    echo "ERROR: Invalid value for REDIRECT_PROTO, got '${REDIRECT_PROTO}'" >&2
+    echo "ERROR: Valid values are: 'auto', 'http' or 'https'" >&2
+    exit 1
 fi
 
-exec /usr/bin/supervisord
+# Replace templates in nginx config
+for file in /etc/nginx/*/*.tpl; do
+    sed \
+        -e "s#{{DOCUMENT_ROOT}}#${DOCUMENT_ROOT}#g" \
+        -e "s#{{REDIRECT_CODE}}#${REDIRECT_CODE}#g" \
+        -e "s#{{REDIRECT_PROTO}}#${REDIRECT_PROTO}#g" \
+        "${file}" \
+        > "${file%.tpl}"
+done
+
+# Activate the right
+rm -f /etc/nginx/sites-enabled/redirect-*.conf
+if [[ -f "/etc/nginx/sites-available/redirect-${REDIRECT_MODE}.conf" ]]; then
+    ln -s \
+        "/etc/nginx/sites-available/redirect-${REDIRECT_MODE}.conf" \
+        "/etc/nginx/sites-enabled/redirect-${REDIRECT_MODE}.conf"
+fi
+
+exec /usr/bin/supervisord -c /etc/supervisord.conf