# HAProxy configuration for Ouranos Titania
# Managed by Ansible - Red Panda Approved

global
    log 127.0.0.1:{{ haproxy_syslog_port }} local0
    stats timeout 30s

    # Default SSL material locations
    ca-base /etc/ssl/certs
    crt-base /etc/ssl/private

    # SSL/TLS configuration
    ssl-default-bind-ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384
    ssl-default-bind-ciphersuites TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256
    ssl-default-bind-options ssl-min-ver TLSv1.2 no-tls-tickets

defaults
    log     global
    mode    http
    option  httplog
    option  dontlognull
    # Log format with timing information for latency analysis
    log-format "%ci:%cp [%tr] %ft %b/%s %TR/%Tw/%Tc/%Tr/%Ta %ST %B %CC %CS %tsc %ac/%fc/%bc/%sc/%rc %sq/%bq %hr %hs %{+Q}r"
    timeout connect 5s
    timeout client  50s
    timeout server  50s

# Stats page with Prometheus metrics
listen stats
    bind *:{{ haproxy_stats_port }}
    mode http
    stats enable
    stats uri /metrics
    stats refresh 15s
    stats show-legends
    stats show-node
    
    # Prometheus metrics endpoint
    http-request use-service prometheus-exporter if { path /metrics }

# HTTP frontend - redirect all traffic to HTTPS
frontend http_frontend
    bind *:{{ haproxy_http_port }}
    mode http
    option httplog
    http-request redirect scheme https code 301

# HTTPS frontend with dynamic routing
frontend https_frontend
    bind *:{{ haproxy_https_port }} ssl crt {{ haproxy_cert_path }}
    mode http
    option httplog
    option forwardfor
    
    # Forward original protocol and host for reverse-proxied services
    http-request set-header X-Forwarded-Proto https
    http-request set-header X-Forwarded-Port %[dst_port]
    
    # Security headers
    http-response set-header Strict-Transport-Security "max-age=31536000; includeSubDomains"
    http-response set-header X-Frame-Options "SAMEORIGIN"
    http-response set-header X-Content-Type-Options "nosniff"
    http-response set-header X-XSS-Protection "1; mode=block"
    
{% for backend in haproxy_backends %}
{% if backend.subdomain %}
    # ACL for {{ backend.subdomain }}.{{ haproxy_domain }} (matches with or without port)
    acl host_{{ backend.subdomain }} hdr_beg(host) -i {{ backend.subdomain }}.{{ haproxy_domain }}
{% if backend.redirect_root is defined %}
    # Redirect root path to {{ backend.redirect_root }} (avoids redirect loop by matching exact path)
    http-request redirect location {{ backend.redirect_root }} code 302 if host_{{ backend.subdomain }} { path / }
{% endif %}
    use_backend backend_{{ backend.subdomain }} if host_{{ backend.subdomain }}
{% else %}
    # Default backend for root domain
    default_backend backend_root
{% endif %}
{% endfor %}

# Backend definitions
{% for backend in haproxy_backends %}
{% if backend.subdomain %}
backend backend_{{ backend.subdomain }}
{% else %}
backend backend_root
{% endif %}
    mode http
    balance roundrobin
{% if backend.ssl_backend | default(false) %}
    option httpchk
    http-check send meth GET uri {{ backend.health_path }} hdr Host {{ backend.subdomain }}.{{ haproxy_domain }}
{% else %}
    option httpchk GET {{ backend.health_path }}
{% endif %}
    http-check expect status 200
{% if backend.timeout_server is defined %}
    timeout server {{ backend.timeout_server }}
{% endif %}
    server {{ backend.subdomain or 'root' }}_1 {{ backend.backend_host }}:{{ backend.backend_port }} check{% if backend.ssl_backend | default(false) %} ssl verify none{% endif %}

{% endfor %}
{% for tcp_backend in haproxy_tcp_backends | default([]) %}
# TCP passthrough: {{ tcp_backend.name }}
frontend {{ tcp_backend.name }}_frontend
    bind *:{{ tcp_backend.listen_port }}
    mode tcp
    option tcplog
    default_backend {{ tcp_backend.name }}_backend

backend {{ tcp_backend.name }}_backend
    mode tcp
    server {{ tcp_backend.name }}_1 {{ tcp_backend.backend_host }}:{{ tcp_backend.backend_port }} check

{% endfor %}