# STEP 1 build executable binary
FROM golang:1.17.3-alpine3.13@sha256:07674a997a6ece514c1397c44b1d6cc45b9ade6ba9acb1d3c6072537c4cf82f1 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 alpine:3.14.2@sha256:e1c082e3d3c45cccac829840a25941e679c25d438cc8412c2fa221cf1a824e6a

RUN apk --no-cache add ca-certificates && \
    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"]