ARG ARCH

# STEP 1 build executable binary
FROM amd64/golang:1.16.0-alpine3.13@sha256:12603018421615d3d2c229119ffd263dcf34b152350af63b69d62671b39a2196 AS builder-amd64
FROM arm32v7/golang:1.16.0-alpine3.13@sha256:1eeb5ebd41362acd7a0540f2d0fdc915befaa28ad5a3242de7574054673eeafe AS builder-arm
FROM arm64v8/golang:1.16.0-alpine3.13@sha256:e1645e884060c64b46789c1b65e6d4586608244088f08da90997b28559a10ae5 AS builder-arm64
FROM builder-${ARCH} AS builder

ENV FILTRON_VERSION="v0.2.0"

WORKDIR $GOPATH/src/github.com/asciimoo/filtron

RUN apk upgrade --no-cache && \
    apk add --no-cache tar="1.33-r1" git="2.30.1-r0" curl="7.74.0-r0" && \
    curl -L "https://github.com/asciimoo/filtron/archive/${FILTRON_VERSION}.tar.gz" | tar xvz --strip 1

RUN go get -d -v && gofmt -l ./ && go build .

# STEP 2 build the image including only the binary
FROM amd64/alpine:3.13.1@sha256:3747d4eb5e7f0825d54c8e80452f1e245e24bd715972c919d189a62da97af2ae AS base-amd64
FROM arm32v7/alpine:3.13.1@sha256:817f5bc4194eccd71ad9afe9c2eb7e73a5841180a88a385229bd38ab6daf005b AS base-arm
FROM arm64v8/alpine:3.13.1@sha256:019c59128325536e838a5f36028db214335129f9aa83214cc2c60c10dc1797ac AS base-arm64
FROM base-${ARCH}

RUN apk --no-cache add ca-certificates="20191127-r5" && \
    adduser -D -h /usr/local/filtron -s /bin/false filtron filtron

COPY --from=builder /go/src/github.com/asciimoo/filtron/example_rules.json /etc/filtron/rules.json
COPY --from=builder /go/src/github.com/asciimoo/filtron/filtron /usr/local/filtron/filtron

EXPOSE 3000
USER filtron

ENTRYPOINT ["/usr/local/filtron/filtron", "--rules", "/etc/filtron/rules.json"]