Merge pull request #106 from bird-house/fix-geoserver-not-configured-…

…properly-behind-proxy

Fix geoserver not configured properly behind proxy.

Hitting https://pavics.ouranos.ca/geoserver/wfs?request=GetCapabilities&version=1.1.0

Before fix (wrong scheme and wrong port):
```
<ows:Operation name="GetCapabilities">
<ows:DCP>
<ows:HTTP>
<ows:Get xlink:href="http://pavics.ouranos.ca:80/geoserver/wfs"/>
<ows:Post xlink:href="http://pavics.ouranos.ca:80/geoserver/wfs"/>
</ows:HTTP>
</ows:DCP>
```

After fix:
```
<ows:Operation name="GetCapabilities">
<ows:DCP>
<ows:HTTP>
<ows:Get xlink:href="https://pavics.ouranos.ca:443/geoserver/wfs"/>
<ows:Post xlink:href="https://pavics.ouranos.ca:443/geoserver/wfs"/>
</ows:HTTP>
</ows:DCP>
```

This config automate manual step to set proxy base url in Geoserver UI https://docs.geoserver.org/2.9.3/user/configuration/globalsettings.html#proxy-base-url

I had to override the docker image entrypoint to edit the `server.xml` on the fly before starting Geoserver (Tomcat) since setting Java proxy config did not seem to work (see first commit).

Related to Ouranosinc/raven#297.

birdhouse/config/geoserver/entrypointwrapper

@@ -0,0 +1,17 @@
+#!/bin/sh -x
+
+CONF_FILE="/usr/local/tomcat/conf/server.xml"
+
+# Configure proxy support as per
+# https://tomcat.apache.org/tomcat-8.0-doc/config/http.html#Proxy_Support
+# This config automate manual step to set proxy base url in Geoserver UI:
+# https://docs.geoserver.org/2.9.3/user/configuration/globalsettings.html#proxy-base-url
+if ! grep " scheme=\"https\" proxyName=\"${PAVICS_FQDN_PUBLIC}\" proxyPort=\"443\" " $CONF_FILE; then
+    ORIGINAL_FILE="${CONF_FILE}.bak.proxy.$$"
+    cp -v $CONF_FILE $ORIGINAL_FILE
+    sed -i "s/<Connector /<Connector scheme=\"https\" proxyName=\"${PAVICS_FQDN_PUBLIC}\" proxyPort=\"443\" /g" $CONF_FILE
+    diff -u $ORIGINAL_FILE $CONF_FILE
+fi
+
+# chain existing entrypoint
+catalina.sh run

birdhouse/docker-compose.yml

@@ -105,11 +105,16 @@ services:
     container_name: geoserver
     ports:
       - "8087:8080"
+    environment:
+      # for custom entrypoint
+      PAVICS_FQDN_PUBLIC: $PAVICS_FQDN_PUBLIC
     volumes:
       - /data/geoserver:/opt/geoserver/data_dir
       - ./config/geoserver/web.xml:/usr/local/tomcat/conf/web.xml
+      - ./config/geoserver/entrypointwrapper:/entrypointwrapper:ro
     links:
       - postgis
+    entrypoint: /entrypointwrapper
     restart: always
 
   malleefowl: