FROM docker.io/alpine as builder

ENV TMPDIR "/tmp/build"

RUN mkdir -v -- "${TMPDIR}" \
	&& apk add --no-cache --virtual __build gettext apache-ant openjdk8

RUN cd "${TMPDIR}" \
	&& for repo in i2p.plugins.i2psnark-rpc i2p.i2p; do \
		who="i2p/${repo}" \
		&& latest="$( \
			wget -O- "https://api.github.com/repos/${who}/tags" \
			| sed -n '/"name":/{s/.*"\([^"]\+\)".*/\1/p;q}')" \
		&& archive="${repo##*.}.tar.gz" \
		&& wget -O "${archive}" \
			"https://github.com/${who}/archive/${latest}.tar.gz" \
		&& tar vxf "${archive}" && rm -vr "${archive}" \
		&& mv -v -- "${repo}"-* "${repo}" \
	; done

RUN i2p="${TMPDIR}/i2p.i2p" && rpc="${TMPDIR}/i2p.plugins.i2psnark-rpc" \
	&& cd "${i2p}" && ant buildI2PSnark buildCore i2psnark \
	&& cd "${rpc}" && ant war \
	&& mv -v -- \
		"${i2p}/apps/i2psnark/java/i2psnark-standalone.zip" \
		"${rpc}/src/build/transmission.war.jar" \
		/

RUN apk del __build && rm -rf -- "${TMPDIR}"

FROM docker.io/alpine

RUN mkdir -v -- /i2psnark && apk add --no-cache openjdk8

WORKDIR /i2psnark

COPY --from=builder /i2psnark-standalone.zip /transmission.war.jar /i2psnark/
RUN unzip -d / ./i2psnark-standalone.zip \
	&& mv -v -- ./transmission.war.jar ./webapps/transmission.war \
	&& rm -v -- ./i2psnark-standalone.zip \
	&& mkdir -v -- ./i2psnark \
	&& printf '%s\n' \
	'#!/bin/sh --' \
	'set -uex' \
	'adduser -u "${USER_ID:?}" -s /bin/sh -h /i2psnark -D i2psnark' \
	'chown i2psnark -R -- /i2psnark' \
	'exec su i2psnark - -c "java -jar i2psnark.jar"' \
	| install -Dm755 /proc/self/fd/0 /i2psnark/entry.sh

CMD ["/i2psnark/entry.sh"]