node-web-mvc/dist/servlets/resources/Resource.js

node spring mvc

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
/**
 * @module Resource
 * @description 静态资源对象
 */
const fs_1 = __importDefault(require("fs"));
const path_1 = __importDefault(require("path"));
const MediaFactory_1 = __importDefault(require("../http/MediaFactory"));
class Resource {
    /**
     * 当前资源内容长度
     */
    get contentLength() {
        return this.stat ? this.stat.size : null;
    }
    /**
     * 最后修改时间
     */
    get lastModified() {
        return this.stat ? this.stat.mtime.getTime() : null;
    }
    /**
     * 获取当前文件的mediaType
     */
    get mediaType() {
        return MediaFactory_1.default.getMediaType(this.url);
    }
    get isReadable() {
        return !!this.stat && this.stat.isFile();
    }
    constructor(filename) {
        this.url = filename;
        this.stat = fs_1.default.existsSync(filename) ? fs_1.default.lstatSync(filename) : null;
    }
    createRelative(relativePath) {
        return new Resource(path_1.default.join(this.url, relativePath));
    }
    /**
     * 获取当前资源的读取流
     */
    getInputStream() {
        return fs_1.default.createReadStream(this.url);
    }
    /**
     * 获取当前资源，指定位置的读取流
     * @param start
     * @param end
     */
    getInputRangeStream(start, end) {
        return fs_1.default.createReadStream(this.url, { start, end });
    }
    /**
     * 将资源文件附加到response
     * @param response 原始返回对象
     * @param start 如果是http-ragen则设置开始位置
     * @param end  如果是http-ragen则设置结束位置
     * @returns
     */
    pipe(response, start, end) {
        return new Promise((resolve, reject) => {
            const stream = start > 0 ? this.getInputRangeStream(start, end) : this.getInputStream();
            const destory = () => {
                stream.close();
            };
            stream.pipe(response);
            stream.on('end', () => {
                stream.close();
                resolve({});
            });
            stream.on('error', reject);
            response.on('error', destory);
            response.on('close', destory);
        });
    }
}
exports.default = Resource;