ARG ARCH

# STEP 1 build executable binary
FROM amd64/golang:1.16.6-alpine3.13@sha256:4a66111be0397d2e59cac61d51aac106fe1a090bbc7fc1aed906f29f671b1efc AS builder-amd64
FROM arm32v7/golang:1.16.6-alpine3.13@sha256:b83c0a6b7314fa6b0c764dadeb46ce9ea1eabbef2965b96dfdc079fcdb23c253 AS builder-arm
FROM arm64v8/golang:1.16.6-alpine3.13@sha256:7331f6c4317e23cce90fbb4483c83e3a49b262770f525efabb9954187c922307 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 git curl && \
    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:3.14.0@sha256:1775bebec23e1f3ce486989bfc9ff3c4e951690df84aa9f926497d82f2ffca9d AS base-amd64
FROM arm32v7/alpine:3.14.0@sha256:8d99168167baa6a6a0d7851b9684625df9c1455116a9601835c2127df2aaa2f5 AS base-arm
FROM arm64v8/alpine:3.14.0@sha256:53b74ddfc6225e3c8cc84d7985d0f34666e4e8b0b6892a9b2ad1f7516bc21b54 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"]