#!/bin/sh
set -eu

max_image_bytes="${VALIDATION_UPLOAD_MAX_IMAGE_BYTES:?}"
json_padding="${VALIDATION_UPLOAD_JSON_BODY_PADDING_BYTES:?}"

UPLOAD_MAX_REQUEST_BODY_BYTES=$(( (max_image_bytes * 4 + 2) / 3 + json_padding ))

export UPLOAD_MAX_REQUEST_BODY_BYTES BACKEND_PORT

render_locations() {
    envsubst '${BACKEND_PORT} ${UPLOAD_MAX_REQUEST_BODY_BYTES}' \
        < /etc/nginx/templates/snippets/private-image-locations.conf.template \
        > /etc/nginx/snippets/private-image-locations.conf
}

render_server() {
    template_path="$1"
    output_path="$2"
    surface="$3"

    if [ "$surface" = "clearnet" ]; then
        if [ -n "${ONION_HOSTNAME:-}" ]; then
            export ONION_LOCATION_HEADER="add_header Onion-Location \"http://${ONION_HOSTNAME}\$request_uri\";"
        else
            export ONION_LOCATION_HEADER=""
        fi

        export CLEARNET_DOMAIN
        
        envsubst '${CLEARNET_DOMAIN} ${ONION_LOCATION_HEADER}' \
            < "$template_path" \
            > "$output_path"

        return
    fi

    cp "$template_path" "$output_path"
}

mkdir -p /etc/nginx/snippets

render_locations
render_server /etc/nginx/templates/conf.d/clearnet.conf.template /etc/nginx/conf.d/clearnet.conf clearnet
render_server /etc/nginx/templates/conf.d/onion.conf.template /etc/nginx/conf.d/onion.conf onion

exec nginx -g 'daemon off;'