Express ?????

?????????

??????????????????????JavaScript ?????????????????????????????????

function static(root, options = {}) {
    const { 
        dotfiles = "ignore",
        etag = true,
        lastModified = true,
        maxAge = 0,
        setHeaders
    } = options;
    
    return function (req, res, next) {
        const { pathname } = url.parse(req.url, true);
        const file = path.join(root, pathname);
        const parts = file.split(path.sep);
        const isDotFile = parts[parts.length - 1][0] === ".";
        
        if (isDotFile && dotfiles === "deny") {
            res.setHeader("Content-Type", "text/html");
            res.statusCode = 403;
            return res.end(http.STATUS_CODES[403]);
        }
        
        fs.stat(file, (error, stat) => {
            if (error) {
                next();
            } else {
                if (etag) {
                    res.setHeader("ETag", stat.mtime.toLocaleDateString());
                }
                if (lastModified) {
                    res.setHeader("Last-Modified", stat.mtime.toUTCString());
                }
                if (typeof setHeaders === "function") {
                    setHeaders(req, req, (params) => {
                        console.log(params);
                    });
                }
                res.setHeader("Cache-Control", `max-age=${maxAge}`);
                res.setHeader("Content-Type", mime.getType(file));
                fs.createReadStream(file).pipe(res);
            }
        });
    };
}

bodyParser ???

bodyParser ?????????????????????????????????????

1. JSON ???

function json(options) {
    return function (req, res, next) {
        const contentType = req.headers["content-type"];
        if (contentType === "application/json") {
            const buffer = [];
            req.on("data", (data) => {
                buffer.push(data);
            });
            req.on("end", () => {
                const result = buffer.toString();
                req.body = JSON.parse(result);
                next();
            });
        } else {
            next();
        }
    };
}

2. URL-encoded ???

function urlencoded(options) {
    const { extended } = options;
    return function (req, res, next) {
        const contentType = req.headers["content-type"];
        if (contentType === "application/x-www-form-urlencoded") {
            const buffer = [];
            req.on("data", (data) => {
                buffer.push(data);
            });
            req.on("end", () => {
                const result = buffer.toString();
                if (extended) {
                    req.body = qs.parse(result);
                } else {
                    req.body = querystring.parse(result);
                }
                next();
            });
        } else {
            next();
        }
    };
}

3. ?????

function text(options) {
    return function (req, res, next) {
        const contentType = type.parse(req.headers["content-type"]);
        const charset = contentType.parameters.charset;
        const cType = contentType.type;
        if (cType === "text/plain") {
            const buffer = [];
            req.on("data", (data) => {
                buffer.push(data);
            });
            req.on("end", () => {
                const r = Buffer.concat(buffer);
                if (charset === "gbk") {
                    req.body = iconv.decode(r, charset);
                } else {
                    req.body = buffer.toString();
                }
                next();
            });
        } else {
            next();
        }
    };
}