#!/bin/bash

set -e

mkdir -p \
  /config/{nginx/site-confs,keys} \
  /var/lib/nginx/tmp/client_body \
  /var/tmp/nginx

# generate keys (maybe)
if [[ $DISABLE_HTTPS -ne 1 ]]; then
    # use self-signed certs
    if [[ -f /config/keys/cert.key && -f /config/keys/cert.crt ]]; then
        echo "using keys found in /config/keys"
    else
        echo "generating self-signed keys in /config/keys, you can replace these with your own keys if required"
        SUBJECT="/C=US/ST=TX/L=Austin/O=jitsi.org/OU=Jitsi Server/CN=*"
        openssl req -new -x509 -days 3650 -nodes -out /config/keys/cert.crt -keyout /config/keys/cert.key -subj "$SUBJECT"
    fi
fi

# Detect nameserver for Nginx, if not specified.
if [[ -z "$NGINX_RESOLVER" ]]; then
    IP_LIST=""

    # Parse IPs in /etc/resolv.conf, taking into account IPv6 addresses need to be
    # enclosed in square brackets for the Nginx config file.
    while read -r line; do
        if [[ $line =~ ^nameserver.* ]]; then
            IP=$(echo $line | cut -d" " -f2)
            COLONS=$(echo $IP | tr -dc ":" | awk '{ print length '})
            if [[ $COLONS -ge 2 ]]; then
                IP="[$IP]"
            fi
            if [[ ! "$IP_LIST" = "" ]]; then
                IP_LIST+=" "
            fi
            IP_LIST+="$IP"
        fi
    done < <(cat /etc/resolv.conf)

    export NGINX_RESOLVER=$IP_LIST
fi

echo "Using Nginx resolver: =$NGINX_RESOLVER="

# colibri-ws settings
COLIBRI_WEBSOCKET_UNSAFE_REGEX="[a-zA-Z0-9-\._]+"
# use custom websocket regex if provided
if [ -z "$COLIBRI_WEBSOCKET_REGEX" ]; then
    # default to the previous unsafe behavior only if flag is set
    if [[ "$ENABLE_COLIBRI_WEBSOCKET_UNSAFE_REGEX" == "1" ]]; then
        export COLIBRI_WEBSOCKET_REGEX="$COLIBRI_WEBSOCKET_UNSAFE_REGEX"
    else
        # default value to the JVB IP, works in compose and anywhere a dns lookup of the JVB reveals the correct IP for proxying
        [ -z "$COLIBRI_WEBSOCKET_JVB_LOOKUP_NAME" ] && export COLIBRI_WEBSOCKET_JVB_LOOKUP_NAME="jvb"
        if [[ "$DISABLE_COLIBRI_WEBSOCKET_JVB_LOOKUP" == "1" ]]; then
            # otherwise value default to the static value in the template 'jvb'
            echo "WARNING: DISABLE_COLIBRI_WEBSOCKET_JVB_LOOKUP is set and no value for COLIBRI_WEBSOCKET_REGEX was provided, using static value 'jvb' for COLIBRI_WEBSOCKET_REGEX"
        else
            export COLIBRI_WEBSOCKET_REGEX="$(dig +short +search $COLIBRI_WEBSOCKET_JVB_LOOKUP_NAME)"
        fi
    fi
fi

# copy config files
tpl /defaults/nginx.conf > /config/nginx/nginx.conf

tpl /defaults/meet.conf > /config/nginx/meet.conf
if [[ -f /config/nginx/custom-meet.conf ]]; then
    cat /config/nginx/custom-meet.conf >> /config/nginx/meet.conf
fi

tpl /defaults/ssl.conf > /config/nginx/ssl.conf

tpl /defaults/default > /config/nginx/site-confs/default

tpl /defaults/system-config.js > /config/config.js
tpl /defaults/settings-config.js >> /config/config.js
if [[ -f /config/custom-config.js ]]; then
    cat /config/custom-config.js >> /config/config.js
fi

cp /defaults/interface_config.js /config/interface_config.js
if [[ -f /config/custom-interface_config.js ]]; then
    cat /config/custom-interface_config.js >> /config/interface_config.js
fi

nginx -c /config/nginx/nginx.conf