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NH_userscript

Wrappers for dealing with variations in userscript managers.

Fra og med 05.11.2023. Se den nyeste version.

Dette script bør ikke installeres direkte. Det er et bibliotek, som andre scripts kan inkludere med metadirektivet // @require https://updategreasyfork.deno.dev/scripts/478349/1275706/NH_userscript.js 

// ==UserScript==
// ==UserLibrary==
// @name        NH_userscript
// @description Wrappers for dealing with variations in userscript managers.
// @version     4
// @license     GPL-3.0-or-later; https://www.gnu.org/licenses/gpl-3.0-standalone.html
// @homepageURL https://github.com/nexushoratio/userscripts
// @supportURL  https://github.com/nexushoratio/userscripts/issues
// @match       https://www.example.com/*
// ==/UserLibrary==
// ==/UserScript==

window.NexusHoratio ??= {};

window.NexusHoratio.userscript = (function userscript() {
  'use strict';

  /** @type {number} - Bumped per release. */
  const version = 4;

  /** Library specific exception. */
  class UserscriptError extends Error {

    /** @inheritdoc */
    constructor(...rest) {
      super(...rest);
      this.name = this.constructor.name;
    }

  }

  /**
   * @typedef LicenseData
   * @property {string} name - License name.
   * @property {string} url - URL pointing to the license.
   */

  /**
   * Per the *old* GM docs:
   * https://sourceforge.net/p/greasemonkey/wiki/Metadata_Block/#license
   * @returns {LicenseData} - Extracted from the userscript header.
   * @throws {Error} - If cannot be extracted.
   */
  function licenseData() {
    let license = GM.info.script.license;
    if (!license) {
      const magic = '// @license ';

      // Try a legacy way
      const header = GM.info.scriptMetaStr;
      if (header) {
        const line = header.split('\n').find(l => l.startsWith(magic));
        if (line) {
          license = line.slice(magic.length).trim();
        }
      }
    }

    if (!license) {
      const msg = [
        'Unable to extract license information from the userscript.',
        // eslint-disable-next-line no-magic-numbers
        JSON.stringify(GM.info, null, 2),
      ].join('\n');
      throw new UserscriptError(msg);
    }

    const [name, url] = license.split(';');

    return {
      name: name.trim(),
      url: url.trim(),
    };
  }

  /** @returns {string[]} - Raw text about the current environment. */
  function environmentData() {
    const gm = GM.info;
    const msgs = [`${gm.script.name}: ${gm.script.version}`];
    msgs.push('NexusHoratio libraries:');
    for (const [lib, obj] of Object.entries(window.NexusHoratio)) {
      if (Object.hasOwn(obj, 'version')) {
        msgs.push(`  ${lib}: ${obj.version}`);
      } else {
        msgs.push(`  ${lib}: Unknown version`);
      }
    }

    msgs.push(`Userscript manager: ${gm.scriptHandler} ${gm.version}`);

    if (gm.injectInto) {
      msgs.push(`  injected into "${gm.injectInto}"`);
    }

    // Violentmonkey
    if (gm.platform) {
      msgs.push(`Platform: ${gm.platform.browserName} ` +
                `${gm.platform.browserVersion} ${gm.platform.os} ` +
                `${gm.platform.arch}`);
    }

    // Tampermonkey
    if (gm.userAgentData) {
      let msg = 'Platform: ';
      for (const brand of gm.userAgentData.brands.values()) {
        msg += `${brand.brand} ${brand.version} `;
      }
      msg += `${gm.userAgentData?.platform} `;
      msg +=
        `${gm.userAgentData?.architecture}-${gm.userAgentData?.bitness}`;
      msgs.push(msg);
    }
    return msgs;
  }

  /**
   * Fetches value from userscript storage if granted.
   *
   * Purposefully no errors if permissions are not granted
   *
   * @param {string} key - The name of the value to load.
   * @param {*} defaultValue - Value if not stored OR not enabled.
   * @returns {Promise<*>} - The value fetched or defaultValue.
   */
  function getValue(key, defaultValue) {
    if (GM.getValue) {
      return GM.getValue(key, defaultValue);
    }
    return Promise.resolve(defaultValue);
  }

  /**
   * Sets a value in userscript storage if granted.
   *
   * Purposefully no errors if permissions are not granted
   *
   * @param {string} key - The name to use in the storage.
   * @param {*} value - The value to set.
   * @returns {Promise<*>} - Always resolves to null; mostly used to ensure
   * the write is complete.
   */
  function setValue(key, value) {
    if (GM.setValue) {
      return GM.setValue(key, value);
    }
    return Promise.resolve(null);
  }

  return {
    version: version,
    UserscriptError: UserscriptError,
    licenseData: licenseData,
    environmentData: environmentData,
    getValue: getValue,
    setValue: setValue,
  };

}());