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#
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FROM openjdk:11-jre

# Install dependencies
RUN set -ex; \
  apt-get update; \
  apt-get -y install libsnappy1v5 gettext-base; \
  rm -rf /var/lib/apt/lists/*

# Grab gosu for easy step-down from root
ENV GOSU_VERSION 1.11
RUN set -ex; \
  wget -nv -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$(dpkg --print-architecture)"; \
  wget -nv -O /usr/local/bin/gosu.asc "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$(dpkg --print-architecture).asc"; \
  export GNUPGHOME="$(mktemp -d)"; \
  for server in ha.pool.sks-keyservers.net $(shuf -e \
                          hkp://p80.pool.sks-keyservers.net:80 \
                          keyserver.ubuntu.com \
                          hkp://keyserver.ubuntu.com:80 \
                          pgp.mit.edu) ; do \
      gpg --batch --keyserver "$server" --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4 && break || : ; \
  done && \
  gpg --batch --verify /usr/local/bin/gosu.asc /usr/local/bin/gosu; \
  gpgconf --kill all; \
  rm -rf "$GNUPGHOME" /usr/local/bin/gosu.asc; \
  chmod +x /usr/local/bin/gosu; \
  gosu nobody true

# Configure Flink version
ENV FLINK_TGZ_URL=https://www.apache.org/dyn/closer.cgi?action=download&filename=flink/flink-1.11.6/flink-1.11.6-bin-scala_2.11.tgz \
    FLINK_ASC_URL=https://www.apache.org/dist/flink/flink-1.11.6/flink-1.11.6-bin-scala_2.11.tgz.asc \
    GPG_KEY=19F2195E1B4816D765A2C324C2EED7B111D464BA \
    CHECK_GPG=true

# Prepare environment
ENV FLINK_HOME=/opt/flink
ENV PATH=$FLINK_HOME/bin:$PATH
RUN groupadd --system --gid=9999 flink && \
    useradd --system --home-dir $FLINK_HOME --uid=9999 --gid=flink flink
WORKDIR $FLINK_HOME

# Install Flink
RUN set -ex; \
  wget -nv -O flink.tgz "$FLINK_TGZ_URL"; \
  \
  if [ "$CHECK_GPG" = "true" ]; then \
    wget -nv -O flink.tgz.asc "$FLINK_ASC_URL"; \
    export GNUPGHOME="$(mktemp -d)"; \
    for server in ha.pool.sks-keyservers.net $(shuf -e \
                            hkp://p80.pool.sks-keyservers.net:80 \
                            keyserver.ubuntu.com \
                            hkp://keyserver.ubuntu.com:80 \
                            pgp.mit.edu) ; do \
        gpg --batch --keyserver "$server" --recv-keys "$GPG_KEY" && break || : ; \
    done && \
    gpg --batch --verify flink.tgz.asc flink.tgz; \
    gpgconf --kill all; \
    rm -rf "$GNUPGHOME" flink.tgz.asc; \
  fi; \
  \
  tar -xf flink.tgz --strip-components=1; \
  rm flink.tgz; \
  \
  chown -R flink:flink .;

# Configure container
COPY docker-entrypoint.sh /
ENTRYPOINT ["/docker-entrypoint.sh"]
EXPOSE 6123 8081
CMD ["help"]