initial commit of customized nginx

.woodpecker.yml

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+labels:
+  platform: linux/amd64
+  backend: docker
+
+steps:
+  build-image:
+    image: docker
+    commands:
+      - docker build -t . goatbin
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock

Dockerfile

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+FROM nginx
+ENV VOUCH_INTERNAL=vouch:9090
+ADD nginx.conf.template /
+ADD docker-entrypoint.d /docker-entrypoint.d

docker-entrypoint.d/05-generate-configuration.sh

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+#!/bin/sh
+sed "s#@VOUCH_INTERNAL@#$VOUCH_INTERNAL#g" /nginx.conf.template > /etc/nginx/conf.d/default.conf
+sed -i "s#@VOUCH_EXTERNAL@#$VOUCH_EXTERNAL#g" /etc/nginx/conf.d/default.conf

nginx.conf.template

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+server {
+    listen       80;
+
+    #access_log  /var/log/nginx/host.access.log  main;
+
+    # send all requests to the `/validate` endpoint for authorization
+    auth_request /validate;
+
+    location = /validate {
+      # forward the /validate request to Vouch Proxy
+      proxy_pass http://@VOUCH_INTERNAL@/validate;
+      # be sure to pass the original host header
+      proxy_set_header Host $http_host;
+
+      # Vouch Proxy only acts on the request headers
+      proxy_pass_request_body off;
+      proxy_set_header Content-Length "";
+
+      # optionally add X-Vouch-User as returned by Vouch Proxy along with the request
+      auth_request_set $auth_resp_x_vouch_user $upstream_http_x_vouch_user;
+
+      # these return values are used by the @error401 call
+      auth_request_set $auth_resp_jwt $upstream_http_x_vouch_jwt;
+      auth_request_set $auth_resp_err $upstream_http_x_vouch_err;
+      auth_request_set $auth_resp_failcount $upstream_http_x_vouch_failcount;
+    }
+
+    # if validate returns `401 not authorized` then forward the request to the error401block
+    error_page 401 = @error401;
+
+    location @error401 {
+        # redirect to Vouch Proxy for login
+        return 302 https://@VOUCH_EXTERNAL@/login?url=$scheme://$http_host$request_uri&vouch-failcount=$auth_resp_failcount&X-Vouch-Token=$auth_resp_jwt&error=$auth_resp_err;
+    }
+
+    location / {
+        autoindex on;
+        root   /usr/share/nginx/html;
+        index  index.html index.htm;
+    }
+}