#!/bin/bash

# Modified based on Squid OCI image entrypoint

# This entrypoint aims to forward the squid logs to stdout to assist users of
# common container related tooling (e.g., kubernetes, docker-compose, etc) to
# access the service logs.

# Moreover, it invokes the squid binary, leaving all the desired parameters to
# be provided by the "command" passed to the spawned container. If no command
# is provided by the user, the default behavior (as per the CMD statement in
# the Dockerfile) will be to use Ubuntu's default configuration [1] and run
# squid with the "-NYC" options to mimic the behavior of the Ubuntu provided
# systemd unit.

# [1] The default configuration is changed in the Dockerfile to allow local
# network connections. See the Dockerfile for further information.

echo "[ENTRYPOINT] re-create snakeoil self-signed certificate removed in the build process"
if [ ! -f /etc/ssl/private/ssl-cert-snakeoil.key ]; then
    /usr/sbin/make-ssl-cert generate-default-snakeoil --force-overwrite > /dev/null 2>&1
fi

tail -F /var/log/squid/access.log 2>/dev/null &
tail -F /var/log/squid/error.log 2>/dev/null &
tail -F /var/log/squid/store.log 2>/dev/null &
tail -F /var/log/squid/cache.log 2>/dev/null &

ALLOW_PRIVATE_CONF=/etc/squid/dify_allow_private.conf
SANDBOX_PROXY_CONF=/etc/squid/dify_sandbox_proxy.conf

write_optional_private_allowlist() {
    local env_name="$1"
    local acl_name="$2"
    local acl_type="$3"
    local raw_values="${!env_name:-}"

    raw_values="${raw_values//,/ }"

    if [ -z "${raw_values//[[:space:]]/}" ]; then
        return
    fi

    printf 'acl %s %s' "$acl_name" "$acl_type" >> "$ALLOW_PRIVATE_CONF"
    for value in $raw_values; do
        printf ' %s' "$value" >> "$ALLOW_PRIVATE_CONF"
    done
    printf '\nhttp_access allow client_localnet %s\n' "$acl_name" >> "$ALLOW_PRIVATE_CONF"
}

{
    echo "# Generated by docker-entrypoint.sh."
    echo "# Allows selected private targets before the default private-network deny rule."
} > "$ALLOW_PRIVATE_CONF"
write_optional_private_allowlist "SSRF_PROXY_ALLOW_PRIVATE_IPS" "dify_allowed_private_networks" "dst"
write_optional_private_allowlist "SSRF_PROXY_ALLOW_PRIVATE_DOMAINS" "dify_allowed_private_domains" "dstdomain"

{
    echo "# Generated by docker-entrypoint.sh."
    echo "# Enables the middleware-only sandbox host bridge when configured."
} > "$SANDBOX_PROXY_CONF"

if [ -n "${SSRF_SANDBOX_PROXY_PORT:-}" ]; then
    sandbox_proxy_host="${SSRF_SANDBOX_PROXY_HOST:-sandbox}"
    sandbox_proxy_target_port="${SANDBOX_PORT:-8194}"

    {
        printf 'http_port %s accel vhost\n' "$SSRF_SANDBOX_PROXY_PORT"
        printf 'cache_peer %s parent %s 0 no-query originserver name=dify_sandbox\n' \
            "$sandbox_proxy_host" \
            "$sandbox_proxy_target_port"
        printf 'acl dify_sandbox_proxy_port localport %s\n' "$SSRF_SANDBOX_PROXY_PORT"
        printf 'http_access allow dify_sandbox_proxy_port\n'
    } >> "$SANDBOX_PROXY_CONF"
fi

# Replace environment variables in a template file.
expand_env() {
    awk '{
        while(match($0, /\${[A-Za-z_][A-Za-z_0-9]*}/)) {
            var = substr($0, RSTART+2, RLENGTH-3)
            val = ENVIRON[var]
            $0 = substr($0, 1, RSTART-1) val substr($0, RSTART+RLENGTH)
        }
        print
    }' "$1"
}

# Replace environment variables in the templates and output to squid.conf
echo "[ENTRYPOINT] replacing environment variables in the templates"
expand_env /etc/squid/squid.conf.template > /etc/squid/squid.conf
expand_env /etc/squid/dify_common.conf.template > /etc/squid/dify_common.conf

/usr/sbin/squid -Nz
echo "[ENTRYPOINT] starting squid"
/usr/sbin/squid -f /etc/squid/squid.conf -NYC 1
