FROM golang:1.21-alpine AS builder

ARG APK_MIRROR=https://mirrors.aliyun.com/alpine
ARG GOPROXY=https://goproxy.cn,direct

RUN set -eux; \
  printf '%s\n' \
  "${APK_MIRROR}/v3.20/main" \
  "${APK_MIRROR}/v3.20/community" > /etc/apk/repositories; \
  apk add --no-cache ca-certificates tzdata git

WORKDIR /src

COPY go.mod go.sum ./
ENV GOPROXY=${GOPROXY}

RUN go mod download

COPY . .

RUN set -eux; \
  CGO_ENABLED=0 GOOS=linux GOARCH=amd64 \
  go build -trimpath -ldflags="-s -w" -o /out/qr-scanner .

FROM alpine:3.20

ARG APK_MIRROR=https://mirrors.aliyun.com/alpine

RUN set -eux; \
  printf '%s\n' \
  "${APK_MIRROR}/v3.20/main" \
  "${APK_MIRROR}/v3.20/community" > /etc/apk/repositories; \
  apk add --no-cache ca-certificates tzdata; \
  addgroup -S app && adduser -S -G app app

WORKDIR /app

COPY --from=builder /out/qr-scanner /app/qr-scanner
COPY --from=builder /src/static /app/static

USER app
EXPOSE 8080
ENTRYPOINT ["/app/qr-scanner"]