apache2.tmpl

LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_http_module modules/mod_proxy_http.so
LoadModule slotmem_shm_module modules/mod_slotmem_shm.so
LoadModule lbmethod_byrequests_module modules/mod_lbmethod_byrequests.so
LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
LoadModule rewrite_module modules/mod_rewrite.so


{{ $topdomain := env "TOPDOMAIN" | default "localhost" }}
{{ $redirectProtocol := eq (env "REDIRECT_TO_SECURE") "true" | ternary "https" "http" }}


{{ with env "CUSTOM_CONFIG" }}
{{ . }}
{{ end }}
AllowEncodedSlashes NoDecode
ProxyPreserveHost On


{{ if eq (env "DEFAULT_REDIRECT_TO_TOPDOMAIN") "true" }}
<VirtualHost *:80>

    Redirect / {{ $redirectProtocol }}://{{ $topdomain }}/

</VirtualHost>
{{ end }}


{{/* Only keep containers with exposed port */}}
{{ $exposedContainers := list }}
{{ range $container := $ }}
    {{ range $address := $container.Addresses }}
        {{ if $address.HostPort }}
            {{ $exposedContainers = append $exposedContainers $container }}
            {{ break }}
        {{ end }}
    {{ end }}
{{ end }}

{{/* Only keep containers with webproxy labels */}}
{{ $webproxyfiedContainers := list }}
{{ range $container := $exposedContainers }}
    {{ range $label, $value := $container.Labels }}
        {{ if hasPrefix "webproxy." $label }}
            {{ $webproxyfiedContainers = append $webproxyfiedContainers $container }}
            {{ break }}
        {{ end }}
    {{ end }}
{{ end }}


{{/* Group containers by subdomain */}}
{{ range $subdomain, $containers := groupByLabelWithDefault $webproxyfiedContainers "webproxy.subdomain" "" }}
    {{/* Group containers by path (and sort them by path) */}}
    {{ $containersByPath := dict }}
    {{ range $container := $containers }}
        {{ $path := index $container.Labels "webproxy.path" | default "" }}
        {{ if not (index $containersByPath $path) }}
            {{ $containersByPath = set $containersByPath $path (list $container) }}
        {{ else }}
            {{ $containersByPath = set $containersByPath $path (append (index $containersByPath $path) $container) }}
        {{ end }}
    {{ end }}

    {{/* Create a host for each subdomain */}}
<VirtualHost *:80>

    {{ if eq $subdomain "" }}
    ServerName {{ $topdomain }}
    {{ else }}
    ServerName {{ $subdomain }}.{{ $topdomain }}
    {{ end }}

    {{ with index ($containers | first).Labels "webproxy.serveradmin" }}
    ServerAdmin {{ . }}
    {{ end }}

    {{ range $path, $containers := $containersByPath }}
        {{/* Create a proxy for each path */}}
    <Proxy "balancer://http-{{ $path }}">
        {{ $websockets := "" }}
        {{ $affinityCookie := "" }}
        {{ $custom := "" }}
        {{ range $container := $containers }}
        # Container {{ $container.Name }}
            {{ $address := where $container.Addresses "Port" (index $container.Labels "webproxy.port") | default (sortObjectsByKeysAsc $container.Addresses "Port") | first }}
            {{ $port := $address.HostPort }}
            {{ $ip := ($container.Networks | first).Gateway }}
        BalancerMember "http://{{ $ip }}:{{ $port }}"
            {{ $websockets = index $container.Labels "webproxy.websockets" | default $websockets }}
            {{ $affinityCookie = index $container.Labels "webproxy.affinitycookie" | default $affinityCookie }}
            {{ $custom = index $container.Labels "webproxy.custom" | default $custom }}
        {{ end }}
        {{ with $affinityCookie }}
        ProxySet stickysession={{ . }}
        {{ end }}
    </Proxy>
        {{ if $websockets }}
    <Proxy "balancer://ws-{{ $path }}">
            {{ range $container := $containers }}
                {{ if index $container.Labels "webproxy.websockets" }}
        # Container {{ $container.Name }}
                    {{ $address := where $container.Addresses "Port" (index $container.Labels "webproxy.port") | default (sortObjectsByKeysAsc $container.Addresses "Port") | first }}
                    {{ $port := $address.HostPort }}
                    {{ $ip := ($container.Networks | first).Gateway }}
        BalancerMember "ws://{{ $ip }}:{{ $port }}"
                {{ end }}
            {{ end }}
    </Proxy>
        {{ end }}
    <Location "/{{ $path }}">
        {{ if not (eq $path "") }}
        RewriteEngine On
        RewriteCond %{REQUEST_URI} ^/{{ $path }}$
        RewriteRule ^(.*)$ /{{ $path }}/ [R=301,L]
    </Location>
    <Location "/{{ $path }}/">
        Header edit Location ^(/.*)$ "/{{ $path }}$1"
        {{ end }}

        {{ if $websockets }}
        ProxyPass "balancer://dummy/"
        RewriteEngine On
        RewriteCond %{HTTP:Connection} Upgrade [NC]
        RewriteCond %{HTTP:Upgrade} websocket [NC]
        RewriteRule balancer://dummy/(.*) "balancer://ws-{{ $path }}/$1" [P,L]
        RewriteRule balancer://dummy/(.*) "balancer://http-{{ $path }}/$1" [P,L]
        ProxyPassReverse "balancer://ws-{{ $path }}/"
        ProxyPassReverse "balancer://http-{{ $path }}/"
        {{ else }}
        ProxyPass "balancer://http-{{ $path }}/" nocanon
        ProxyPassReverse "balancer://http-{{ $path }}/"
        {{ end }}

        {{ with $custom }}
        {{ . | nindent 8 }}
        {{ end }}
    </Location>
    {{ end }}

    {{ if eq $subdomain "" }}
        {{ with env "IGNORE_PATHS" }}
    # Paths to ignore
            {{ range $ignore_path := (split . ",") }}
    <Location "/{{ $ignore_path }}">
        ProxyPass !
    </Location>
            {{ end }}
        {{ end }}
    {{ end }}

</VirtualHost>

{{ end }}