Python使用Flask构建智能的静态文件服务器

from flask import Flask, send_file, jsonify, abort
import os
import json
import magic
# pip install Flask python-magic


app = Flask(__name__, static_folder='')


# 你支持的已知扩展名（不会自动加 .json）
KNOWN_EXTENSIONS = {
    '.html', '.js', '.css', '.png', '.jpg', '.jpeg', '.gif',
    '.svg', '.ico', '.wav', '.mp3', '.mp4', '.webp', '.ttf', '.woff', '.woff2'
}


def has_known_extension(filename):
    _, ext = os.path.splitext(filename)
    return ext.lower() in KNOWN_EXTENSIONS


def is_valid_json_file(file_path):
    if not os.path.isfile(file_path):
        return False
    try:
        with open(file_path, 'r', encoding='utf-8') as f:
            json.load(f)
        return True
    except Exception:
        return False


def get_mime_type(file_path):
    if is_valid_json_file(file_path):
        return 'application/json'
    mime = magic.Magic(mime=True)
    return mime.from_file(file_path)


@app.route('/', defaults={'req_path': 'index.html'})
@app.route('/<path:req_path>', methods=['GET', 'POST'])
def serve_file(req_path):
    full_path = os.path.join(app.static_folder, req_path)


    # 情况 1: 请求的是存在的实际文件
    if os.path.isfile(full_path):
        mime_type = get_mime_type(full_path)
        if mime_type == 'application/json':
            with open(full_path, 'r', encoding='utf-8') as f:
                return jsonify(json.load(f))
        return send_file(full_path, mimetype=mime_type)


    # 情况 2: 无已知扩展名，尝试加 `.json`
    if not has_known_extension(req_path):
        json_path = full_path + '.json'
        if os.path.isfile(json_path) and is_valid_json_file(json_path):
            with open(json_path, 'r', encoding='utf-8') as f:
                return jsonify(json.load(f))


    # 情况 3: 都没有命中
    abort(404)


if __name__ == '__main__':
    app.run(debug=True)

KNOWN_EXTENSIONS = {
    '.html', '.js', '.css', '.png', '.jpg', '.jpeg', '.gif',
    '.svg', '.ico', '.wav', '.mp3', '.mp4', '.webp', '.ttf', '.woff', '.woff2'
}

def has_known_extension(filename):
    _, ext = os.path.splitext(filename)
    return ext.lower() in KNOWN_EXTENSIONS

def is_valid_json_file(file_path):
    if not os.path.isfile(file_path):
        return False
    try:
        with open(file_path, 'r', encoding='utf-8') as f:
            json.load(f)
        return True
    except Exception:
        return False

def get_mime_type(file_path):
    if is_valid_json_file(file_path):
        return 'application/json'
    mime = magic.Magic(mime=True)
    return mime.from_file(file_path)

@app.route('/', defaults={'req_path': 'index.html'})
@app.route('/<path:req_path>', methods=['GET', 'POST'])
def serve_file(req_path):
    # ... 实现逻辑

pip install Flask python-magic

python app.py