Non-root user (Rootless)

FROM node:18-alpine AS base

# Install dependencies only when needed
FROM base AS deps
# Check https://github.com/nodejs/docker-node/tree/b4117f9333da4138b03a546ec926ef50a31506c3#nodealpine to understand why libc6-compat might be needed.
RUN apk add --no-cache libc6-compat
WORKDIR /app

# Install dependencies based on the preferred package manager
COPY package.json yarn.lock* package-lock.json* pnpm-lock.yaml* ./
RUN \
  if [ -f yarn.lock ]; then yarn --frozen-lockfile; \
  elif [ -f package-lock.json ]; then npm ci; \
  elif [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm i --frozen-lockfile; \
  else echo "Lockfile not found." && exit 1; \
  fi


# Rebuild the source code only when needed
FROM base AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .

# Next.js collects completely anonymous telemetry data about general usage.
# Learn more here: https://nextjs.org/telemetry
# Uncomment the following line in case you want to disable telemetry during the build.
# ENV NEXT_TELEMETRY_DISABLED 1

RUN \
  if [ -f yarn.lock ]; then yarn run build; \
  elif [ -f package-lock.json ]; then npm run build; \
  elif [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm run build; \
  else echo "Lockfile not found." && exit 1; \
  fi

# Production image, copy all the files and run next
FROM base AS runner
WORKDIR /app

ENV NODE_ENV production
# Uncomment the following line in case you want to disable telemetry during runtime.
# ENV NEXT_TELEMETRY_DISABLED 1

RUN addgroup --system --gid 1001 nodejs
RUN adduser --system --uid 1001 nextjs

COPY --from=builder /app/public ./public

# Set the correct permission for prerender cache
RUN mkdir .next
RUN chown nextjs:nodejs .next

# Automatically leverage output traces to reduce image size
# https://nextjs.org/docs/advanced-features/output-file-tracing
COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static

USER nextjs

EXPOSE 3000

ENV PORT 3000

# server.js is created by next build from the standalone output
# https://nextjs.org/docs/pages/api-reference/next-config-js/output
CMD HOSTNAME="0.0.0.0" node server.js

# syntax=docker/dockerfile:1
ARG NODE_VERSION=22.2.0
ARG PNPM_VERSION=8.15.5

# Build
FROM node:${NODE_VERSION}-alpine AS build

# Install pnpm.
RUN --mount=type=cache,target=/root/.npm \
  npm install -g pnpm@${PNPM_VERSION}


WORKDIR /app

RUN --mount=type=bind,source=package.json,target=package.json \
  --mount=type=bind,source=pnpm-lock.yaml,target=pnpm-lock.yaml \
  --mount=type=cache,target=/root/.local/share/pnpm/store \
  pnpm install --frozen-lockfile

COPY . .

RUN pnpm run build && pnpm prune --prod

# Final
FROM node:${NODE_VERSION}-alpine AS runner

ENV NODE_ENV=production
WORKDIR /app


# add nonroot user and group
RUN addgroup --system --gid 1001 nodejs && adduser --system --uid 1001 nonroot

# make uploads folder
RUN mkdir -p ./uploads && chmod 700 ./uploads && chown -R nonroot:nodejs ./uploads

# when copy use flag --chown=<user>:<group>
COPY --from=build --chown=nonroot:nodejs /app/dist ./dist
COPY --from=build --chown=nonroot:nodejs /app/node_modules ./node_modules
COPY --from=build --chown=nonroot:nodejs /app/package.json ./package.json

# finally use nonroot user
USER nonroot

EXPOSE 3333

CMD ["node", "dist/index.js"]