Dockerfile

# 第一阶段：构建 Flutter Web 产物
FROM debian:bookworm-slim AS build-env

# 安装必要的工具
RUN apt-get update && apt-get install -y \
    curl git unzip xz-utils libglu1-mesa python3 \
    && rm -rf /var/lib/apt/lists/*

# 创建非 root 用户 (Hugging Face 推荐做法)
RUN useradd -m -u 1000 flutteruser
USER flutteruser
WORKDIR /home/flutteruser

# 下载并安装 Flutter SDK (使用 stable 分支更稳)
RUN git clone --depth 1 --branch stable https://github.com/flutter/flutter.git /home/flutteruser/flutter
ENV PATH="/home/flutteruser/flutter/bin:/home/flutteruser/flutter/bin/cache/dart-sdk/bin:${PATH}"

# 禁用分析并配置仅 Web 支持，避免下载 Gradle/Android 等无关组件
RUN flutter config --no-analytics
RUN flutter config --no-enable-android --no-enable-ios --no-enable-linux-desktop --no-enable-macos-desktop --no-enable-windows-desktop
RUN flutter config --enable-web

# 预下载 Web 产物，减少后续构建时间
RUN flutter precache --web

# 复制项目文件
WORKDIR /home/flutteruser/app
COPY --chown=flutteruser:flutteruser . .

# 获取依赖并构建 Web 产物
RUN flutter pub get
RUN flutter build web --release --no-tree-shake-icons

# 第二阶段：运行阶段
FROM python:3.9-slim

# 创建并使用非 root 用户
RUN useradd -m -u 1000 user
USER user
ENV PATH="/home/user/.local/bin:$PATH"

WORKDIR /home/user/app

# 从构建阶段复制 build/web 产物
COPY --from=build-env --chown=user:user /home/flutteruser/app/build/web /home/user/app/web

WORKDIR /home/user/app/web

# Hugging Face Spaces 默认端口
ENV PORT=7860
EXPOSE 7860

# 启动简易服务器
CMD ["python3", "-m", "http.server", "7860"]