utils.ts

import "deno.land/std/http/server.ts";

/**
 * 对 Title 进行 Parse
 * @param str string
 */
export const parse = (str: string): string =>
  str
    .replace(/(\d{0,4})\.(\s[A-Za-z]+)/g, "$2")
    .trim()
    .toLowerCase()
    .replace(/\-/g, " ")
    .replace(/\s+/g, " ")
    .replace(/([(|)|,'?:`])/g, "")
    .replace(/\s/g, "-");

/**
 * Download remote image
 */
export const download = (uri: string): Promise<Buffer> => {
  return new Promise((resovle, reject) => {
    https
      .request({
        hostname: "assets.leetcode.com",
        port: 443,
        path: "/uploads/2019/08/01/1480-binary-tree-coloring-game.png",
        method: "GET",
      })
      .on("response", (res: any) => {
        if (res.headers["content-length"] > 2 * 1024 * 1024) {
          reject("Image too large.");
        } else if (!~[200, 304].indexOf(res.statusCode)) {
          reject("Received an invalid status code.");
        } else if (!res.headers["content-type"].match(/image/)) {
          reject("Not an image.");
        } else {
          let backet: any = "";
          res.setEncoding("binary");
          res
            .on("error", (err: Error) => reject(err))
            .on("data", (chunk: any) => (backet += chunk))
            .on("end", () => resovle(backet));
        }
      })
      .on("error", (err) => reject(err))
      .end();
  });
};