☰

Double-click Image Downloader

Double-click images to download them.

Cómo instalar

Tendrás que instalar una extensión para tu navegador como Tampermonkey, Greasemonkey o Violentmonkey si quieres utilizar este script.

Necesitarás instalar una extensión como Tampermonkey o Violentmonkey para instalar este script.

Necesitarás instalar una extensión como Tampermonkey o Violentmonkey para instalar este script.

Necesitarás instalar una extensión como Tampermonkey o Userscripts para instalar este script.

Necesitará instalar una extensión como Tampermonkey para instalar este script.

Necesitarás instalar una extensión para administrar scripts de usuario si quieres instalar este script.

(Ya tengo un administrador de scripts de usuario, déjame instalarlo)

Cómo instalar

Necesitará instalar una extensión como Stylus para instalar este estilo.

Necesitará instalar una extensión como Stylus para instalar este estilo.

Necesitará instalar una extensión como Stylus para instalar este estilo.

Necesitará instalar una extensión del gestor de estilos de usuario para instalar este estilo.

Necesitará instalar una extensión del gestor de estilos de usuario para instalar este estilo.

Necesitará instalar una extensión del gestor de estilos de usuario para instalar este estilo.

(Ya tengo un administrador de estilos de usuario, déjame instalarlo) 

// ==UserScript==
// @name        Double-click Image Downloader
// @namespace   leaumar
// @match       *://*/*
// @grant       GM.download
// @grant       GM.xmlHttpRequest
// @connect     *
// @version     3
// @author      [email protected]
// @description Double-click images to download them.
// @license     MPL-2.0
// @icon        data:image/png;base64,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
// ==/UserScript==

class HttpError extends Error {
  constructor(verb, response) {
    super(`HTTP request ${verb}.`, {
      cause: response
    });
  }
}

function httpRequest(method, url) {
  return new Promise((resolve, reject) => {
    function fail(verb) {
      return error => reject(new HttpError(verb, error));
    }

    GM.xmlHttpRequest({
      url: url.href,
      onload: resolve,
      onerror: fail('errored'),
      onabort: fail('aborted'),
      ontimeout: fail('timed out'),
      responseType: 'blob',
    });
  });
}

function httpDownload(url, name) {
  return new Promise((resolve, reject) => {
    function fail(verb) {
      return error => reject(new HttpError(verb, error));
    }

    GM.download({
      url: url.href,
      name,
      onload: () => resolve(),
      onerror: fail('errored'),
      onabort: fail('aborted'),
      ontimeout: fail('timed out'),
      responseType: 'blob',
    });
  });
}

// -----------------

// from the greasemonkey docs
const lineSeparator = '\r\n';
const headerSeparator = ": ";

// is it still the 90s?
function parseHeaders(headersString) {
  return headersString.split(lineSeparator).reduce((accumulator, line) => {
    const pivot = line.indexOf(headerSeparator);
    const name = line.slice(0, pivot).trim().toLowerCase();
    const value = line.slice(pivot + headerSeparator.length).trim();
    accumulator[name] = value;
    return accumulator;
  }, {});
}

// ----------------

function filterFilename(name) {
  // foo.jpg
  return /^.+\.(?:jpe?g|png|gif|webp)$/iu.exec(name)?.[0];
}

async function queryFilename(url) {
  const response = await httpRequest('HEAD', url);
  const disposition = parseHeaders(response.responseHeaders)['content-disposition'];
  if (disposition != null) {
    // naive approach, but proper parsing is WAY overkill
    // attachment; filename="foo.jpg" -> foo.jpg
    const serverName = /^(?:attachment|inline)\s*;\s*filename="([^"]+)"/iu.exec(disposition)?.[1];
    if (serverName != null) {
      return filterFilename(serverName);
    }
  }
}

function readFilename(url) {
  const branch = url.pathname;
  const leaf = branch.slice(branch.lastIndexOf('/') + 1);
  return filterFilename(leaf);
}

function sleep(millis) {
    return new Promise(resolve => setTimeout(resolve, millis));
}

async function downloadImage(url, name, image) {
  const opacity = image.style.opacity ?? 1;

  image.style.opacity = 0.5;
  await Promise.all([httpDownload(url, name), sleep(100)]);
  image.style.opacity = opacity;
}

async function onDoubleClick(dblClick) {
  if (dblClick.target.nodeName === 'IMG') {
    const imageElement = dblClick.target;
    const url = new URL(imageElement.src, location.origin);
    const name = readFilename(url) ?? await queryFilename(url);
    if (name == null) {
      throw new Error('Could not determine a filename.');
    }
    await downloadImage(url, name, imageElement);
  }
}

(function main() {
  document.body.addEventListener('dblclick', dblClick => onDoubleClick(dblClick).catch(console.error));
})();