1.0

.gitignore

@@ -0,0 +1,3 @@
+node_modules/
+temp/
+downloads/

index.js

@@ -0,0 +1,281 @@
+const fetch = require("node-fetch");
+const path = require("path");
+const fs = require("fs");
+const readline = require("readline");
+const prompt = require("prompt");
+const JSDOM = require("jsdom").JSDOM;
+const imgToPDF = require('image-to-pdf')
+
+readline.emitKeypressEvents(process.stdin);
+
+class Parser {
+    /**
+     * 解析從 `CNS.getImageUrl` 取得的 XML
+     * @param {string} xml 
+     * @returns {string}
+     */
+    static checksum(xml) {
+        const dom = new JSDOM(xml);
+        const q = selector => dom.window.document.querySelector(selector);
+        const message = q("Message").textContent;
+
+        // 格式：<StatusMsg>,<Checksum>
+        // 範例：Successful!,599ce71fbcff60a1bee5fa3a0d32dc657b487360
+        const checksum = message.split(",")[1];
+
+        return checksum;
+    }
+
+    /**
+     * 解析從 CNS.getMetadata 取得的 HTML
+     * 只會解析第一筆資料
+     * @param {string} html 
+     */
+    static metadata(html) {
+        const dom = new JSDOM(html);
+        const q = (selector, root = dom.window.document) => root.querySelector(selector);
+        const qs = (selector, root = dom.window.document) => [...root.querySelectorAll(selector)];
+
+        if (q("table")) {
+            const titleZh = q(".search_form_line.name li:nth-child(1)").textContent;
+            const titleEn = q(".search_form_line.name li:nth-child(2)").textContent;
+            const updateDate = (() => {
+                // nth-of-type 不支援 class，只能這樣篩選
+                const parent = qs(".search_form_line").filter((e, i) => i === 1)[0];
+                const skyblue = qs(".sky_blue", parent).filter((e, i) => i === 1)[0];
+                const updateDate = skyblue.textContent.replace(/\//g, "-");
+
+                return updateDate;
+            })();
+            const totalPagesHref = q(".btn_05 a").getAttribute("href");
+            const totalPages = totalPagesHref.match(/accessPreview\(.+?(\d+)\);/)[1];
+
+            return {
+                titleZh,
+                titleEn,
+                updateDate,
+                totalPages
+            };
+        }
+
+        return null;
+    }
+
+    /**
+     * 取得使用者輸入的文字
+     * @returns {Promise<string>}
+     */
+    static async promptValue() {
+        console.log(`如要退出程式，請輸入 "exit"`);
+
+        const value = await new Promise(resolve => prompt.get([" "], function (err, res) {
+            console.log();
+            if (res) {
+                resolve(res[" "]);
+            } else {
+                resolve(null);
+            }
+        }));
+
+        if (value === "exit") {
+            process.exit();
+        }
+
+        return value;
+    }
+
+    /**
+     * 取得使用者輸入的值，並判斷是否為 Y/y
+     * @returns {Promise<boolean>}
+     */
+    static async promptBoolean() {
+        console.log(`如要退出程式，請輸入 "exit"`);
+
+        const value = await new Promise(resolve => prompt.get([" "], function (err, res) {
+            console.log();
+            if (res) {
+                resolve(res[" "]);
+            } else {
+                resolve(null);
+            }
+        }));
+
+        if (value === "exit") {
+            process.exit();
+        }
+
+        return value === "Y" || value === "y";
+    }
+}
+
+class CNS {
+    /**
+     * 取得圖片路徑
+     * @param {string} id 
+     * @param {number} page 
+     * @returns {Promise<string>}
+     */
+    static async getImageUrl(id, page) {
+        const xml = await fetch("https://www.cnsonline.com.tw/preview/GetData", {
+            "headers": {
+                "accept": "application/xml, text/xml, */*; q=0.01",
+                "content-type": "application/x-www-form-urlencoded; charset=UTF-8",
+            },
+            "body": `generalno=${id}&version=zh_TW&pageNum=${page}`,
+            "method": "POST",
+        }).then(
+            r => r.text()
+        );
+
+        const checksum = Parser.checksum(xml);
+        const url = `https://www.cnsonline.com.tw/preview/GenerateImage?generalno=${id}&version=zh_TW&pageNum=${page}&checksum=${checksum}`;
+
+        return url;
+    }
+
+    /**
+     * 搜尋
+     * @param {string} id 
+     */
+    static async getMetadata(id) {
+        const html = await fetch("https://www.cnsonline.com.tw/", {
+            "headers": {
+                "content-type": "application/x-www-form-urlencoded",
+                "upgrade-insecure-requests": "1"
+            },
+            "body": `node=result&typeof=quick&locale=zh_TW&searchfield=${id}`,
+            "method": "POST",
+        }).then(
+            r => r.text()
+        );
+
+        return Parser.metadata(html);
+    }
+
+    /**
+     * 下載圖片
+     * @param {string} id 
+     * @param {number} page 
+     * @param {string} path
+     */
+    static async downloadImage(id, page, rootPath) {
+        const filePath = path.join(rootPath, `${page}.jpg`);
+        const url = await CNS.getImageUrl(id, page);
+        const res = await fetch(url);
+        const fileStream = fs.createWriteStream(filePath);
+
+        await new Promise((resolve, reject) => {
+            res.body.pipe(fileStream);
+            res.body.on("error", reject);
+            fileStream.on("finish", resolve);
+        });
+    }
+}
+
+(async () => {
+    while (true) {
+        // ================ [搜尋關鍵字] ================ //
+        console.log("========================================");
+        console.log("請輸入要下載的國家標準(CNS)關鍵字（請儘可能精準，若一次找到多筆資料將只會下載第一筆）");
+        const id = await Parser.promptValue();
+
+        if(id === null) {
+            continue;
+        }
+
+        console.log(`正在搜尋關鍵字 "${id}"...`);
+
+        const metadata = await CNS.getMetadata(id);
+
+        if (metadata === null) {
+            console.log(`沒有找到符合的資料。\n\n`);
+            continue;
+        }
+
+        console.log(`找到資料 (${id})：`);
+        console.log(` - 中文標題：${metadata.titleZh}`);
+        console.log(` - 英文標題：${metadata.titleEn}`);
+        console.log(` - 最後更新日期：${metadata.updateDate}`);
+        console.log(` - 頁數：${metadata.totalPages}\n`);
+
+        console.log("是否下載這筆資料？");
+        console.log(`     Y/y - 下載`);
+        console.log(`   Other - 不要下載，重新搜尋其他關鍵字`);
+        const confirmDownload = await Parser.promptBoolean();
+
+        if (confirmDownload !== true) {
+            continue;
+        }
+
+        // ================ [確定下載，檢查目錄] ================ //
+        const root = path.join(__dirname, "downloads");
+
+        if (!fs.existsSync(root)) {
+            fs.mkdirSync(root);
+        }
+
+        const idRoot = path.join(root, id);
+
+        if (!fs.existsSync(idRoot)) {
+            fs.mkdirSync(idRoot);
+        } else {
+            console.log(`準備下載 ${id}，但發現存在目錄 ${idRoot}`);
+            console.log(`是否取代既有的資料？`);
+            console.log(`     Y/y - 取代資料，程式將把既有目錄刪除並重新下載`);
+            console.log(`   Other - 保留資料，結束此次下載任務，重新搜尋其他關鍵字`);
+
+            const confirmOverwrite = await Parser.promptBoolean();
+
+            if (confirmOverwrite) {
+                fs.rmSync(idRoot, { recursive: true, force: true });
+                fs.mkdirSync(idRoot);
+            } else {
+                continue;
+            }
+        }
+
+        // ================ [開始下載] ================ //
+        for (let i = 1; i <= metadata.totalPages; i++) {
+            process.stdout.write(`\r 下載中${".".repeat(i % 3 + 1)} (${i}/${metadata.totalPages})     `);
+            await CNS.downloadImage(id, i, idRoot);
+        }
+
+        console.log(`\n下載完成\n`);
+
+        // ================ [轉成 PDF 格式] ================ //
+        console.log(`正在產生 PDF 檔案...`);
+
+        const pages = readFilesSync(idRoot);
+        const filePath = path.join(root, `${id}.pdf`);
+        imgToPDF(pages, imgToPDF.sizes.A4).pipe(fs.createWriteStream(filePath));
+
+        console.log(`已完成\n`);
+    }
+
+    /**
+     * 取得指定目錄底下所有檔案（以檔名排序，數字模式）
+     * @param {string} dir 
+     * @returns {Buffer[]}
+     */
+    function readFilesSync(dir) {
+        const files = [];
+
+        fs.readdirSync(dir).forEach(filename => {
+            const name = path.parse(filename).name;
+            const filePath = path.resolve(dir, filename);
+            const stat = fs.statSync(filePath);
+            const isFile = stat.isFile();
+
+            if (isFile) files.push({
+                filePath,
+                name
+            });
+        });
+
+        files.sort((a, b) => {
+            return a.name.localeCompare(b.name, undefined, { numeric: true, sensitivity: 'base' });
+        });
+
+        return files.map(e => fs.readFileSync(e.filePath));
+    }
+})();