ARG ARCH

# STEP 1 build executable binary
FROM amd64/golang:1.15.8-alpine3.13@sha256:4087a9c93dd47e4a599066f63176538204e60fab17c8e3a55adbb11dff097ff6 AS builder-amd64
FROM arm32v7/golang:1.15.8-alpine3.13@sha256:b1f96aeaac2f2fb370c6215218165ce29a55794fec05db341404020229c630c7 AS builder-arm
FROM arm64v8/golang:1.15.8-alpine3.13@sha256:f8e2bfdb45f27aad42e8e9c2fd6ef9d37669672659ab6ac2c9dc07647dea1a6d 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"]