sub2frenz

Sub to all your spacehey friends' blogs in one click. Unsub from non-friends too.
Задайте вопрос, напишите отзыв или пожалуйтесь на скрипт.
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// ==UserScript==
// @name         sub2frenz
// @namespace    http://tampermonkey.net/
// @version      0.1.5
// @description  Sub to all your spacehey friends' blogs in one click.  Unsub from non-friends too.
// @match        https://spacehey.com/home
// @icon         https://spacehey.com/favicon.ico?v=2
// @grant        GM_xmlhttpRequest
// @connect      blog.spacehey.com
// @license      GPL-3.0
// ==/UserScript==

// jshint esversion: 11

(function() {
  'use strict';

  const SCRIPT_NAME = 'sub2frenz';

  const SPACEHEY_URL = 'https://spacehey.com';
  const BLOG_URL = 'https://blog.spacehey.com';

  const MS_PER_SECOND = 1000;
  const PROPAGATION_DELAY_MS = 60 * MS_PER_SECOND;
  const REQUEST_DELAY_MS = 500;

  const MAX_RETRIES = 3;
  const MAX_PAGES = 999;

  const HEADER_RETRY_AFTER = 'retry-after';
  const HTTP_GET = 'GET';
  const HTTP_POST = 'POST';
  const HTTP_SUCCESS_MIN = 200;
  const HTTP_SUCCESS_MAX = 300;
  const HTTP_TOO_MANY_REQUESTS = 429;

  const CLASS_BUTTON_ROW = `${SCRIPT_NAME}-button-row`;
  const CLASS_STATUS = `${SCRIPT_NAME}-status`;
  const CLASS_SUB = `${SCRIPT_NAME}-sub`;
  const CLASS_UNSUB = `${SCRIPT_NAME}-unsub`;
  const CLASS_STOP = `${SCRIPT_NAME}-stop`;
  const CLASS_UNSUBBING = `${SCRIPT_NAME}-unsubbing`;

  const SEL_NEXT_PAGE = '.pagination a.next';
  const SEL_USER_ID_LINK = '.profile.user-home .more-options a[href*="?id="]';
  const SEL_FRIEND_LINK = '.person a[href*="/profile?id="]';
  const SEL_SUBSCRIPTION_LINK = '.entry .publish-date a[href*="/user?id="]';
  const SEL_LEFT_PANEL = '.profile.user-home div.left';
  const SEL_CONTACT = '.contact';

  const LABEL_SUB = "sub 2 \n ur frenz";
  const LABEL_UNSUB = "unsub from \n non-frenz";
  const LABEL_STOP = 'stop unsubbin';

  const STYLES = `
    .${CLASS_BUTTON_ROW} {
      display: flex;
      gap: 8px;
      margin: 8px 0;
    }

    .${CLASS_BUTTON_ROW} button {
      flex: 1;
      display: block;
    }

    .${CLASS_BUTTON_ROW} .${CLASS_STOP} {
      display: none;
    }

    .${CLASS_BUTTON_ROW}.${CLASS_UNSUBBING} .${CLASS_UNSUB} {
      display: none;
    }

    .${CLASS_BUTTON_ROW}.${CLASS_UNSUBBING} .${CLASS_STOP} {
      display: block;
    }

    .${CLASS_STATUS} {
      font-family: 'Consolas', 'SF Mono', 'Menlo',
        'DejaVu Sans Mono', 'Ubuntu Mono', monospace;
      color: #ff6969;
      background: #111;
      padding: 4px 8px;
      margin: 8px 0;
      width: 100%;
      box-sizing: border-box;
    }

    .${CLASS_STATUS}::before {
      content: '> ';
    }

    .${CLASS_STATUS}::after {
      content: '█';
      animation: ${SCRIPT_NAME}-blink 1s step-end infinite;
    }

    @keyframes ${SCRIPT_NAME}-blink {
      50% { opacity: 0; }
    }
  `;

  function injectStyles() {
    const style = document.createElement('style');
    style.textContent = STYLES;

    document.head.appendChild(style);
  }

  // easily filterable
  function log(...args) {
    console.log(`[${SCRIPT_NAME}]`, ...args);
  }

  function warn(...args) {
    console.warn(`[${SCRIPT_NAME}]`, ...args);
  }

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

  function formatElapsed(startMs) {
    const seconds = Math.floor((Date.now() - startMs) / MS_PER_SECOND);
    return `${seconds}s`;
  }

  function isSuccessResponse(response) {
    return response &&
      response.status >= HTTP_SUCCESS_MIN &&
      response.status < HTTP_SUCCESS_MAX;
  }

  function logAndReturn(response, successMessage, failMessage) {
    const succeeded = isSuccessResponse(response);

    if (!succeeded) {
      warn(`${failMessage} (HTTP ${response?.status})`);
      return succeeded;
    }

    log(`${successMessage} (HTTP ${response.status})`);
    return succeeded;
  }

  function retryDelayMs(headers, attempt) {
    let retryAfter = null;

    const retryAfterPattern = new RegExp(
      `${HEADER_RETRY_AFTER}:\\s*(\\d+)`, 'i'
    );
    const safeHeaders = headers || '';
    const match = safeHeaders.match(retryAfterPattern);
    if (match) {
      retryAfter = parseInt(match[1], 10) * MS_PER_SECOND;
    }

    if (retryAfter) {
      return retryAfter;
    }

    const exponentialBackoffMs = MS_PER_SECOND * 2 ** attempt;
    return exponentialBackoffMs;
  }

  function parseHtml(text) {
    return new DOMParser().parseFromString(text, 'text/html');
  }

  function hasNextPage(parsedDoc) {
    return parsedDoc.querySelector(SEL_NEXT_PAGE) !== null;
  }

  function getCurrentUserId() {
    const link = document.querySelector(SEL_USER_ID_LINK);
    let userId = null;
    if (link) {
      userId = new URL(link.href).searchParams.get('id');
    }

    log('current user id:', userId);
    return userId;
  }

  async function gmFetch(method, url, attempt = 0) {
    let data;
    if (method === HTTP_POST) {
      data = 'submit=';
    }

    const response = await new Promise((resolve) => {
      GM_xmlhttpRequest({
        method,
        url,
        headers: {
          'Content-Type': 'application/x-www-form-urlencoded',
          Origin: BLOG_URL,
          Referer: url
        },
        data,
        onload: resolve,
        onerror: () => resolve(null)
      });
    });

    if (response?.status === HTTP_TOO_MANY_REQUESTS && attempt < MAX_RETRIES) {
      const delay = retryDelayMs(response.responseHeaders, attempt);
      warn(
        `rate limited, retrying ${url} in ${delay}ms` +
        ` (attempt ${attempt + 1}/${MAX_RETRIES})`
      );
      await sleep(delay);

      return gmFetch(method, url, attempt + 1);
    }

    return response;
  }

  function parseFriendIds(parsedDoc) {
    const ids = new Set();

    for (const link of parsedDoc.querySelectorAll(SEL_FRIEND_LINK)) {
      const match = link.getAttribute('href').match(/id=(\d+)/);
      if (match) {
        ids.add(match[1]);
      }
    }

    return [...ids];
  }

  async function fetchFriendIdsOnPage(userId, page) {
    const url = `${SPACEHEY_URL}/friends?id=${userId}&page=${page}`;
    let response;

    for (let attempt = 0; attempt <= MAX_RETRIES; attempt++) {
      response = await fetch(url);

      if (response.status !== HTTP_TOO_MANY_REQUESTS) {
        break;
      }

      const retryAfter = response.headers.get(HEADER_RETRY_AFTER);
      let retryAfterHeader = null;
      if (retryAfter) {
        retryAfterHeader = `${HEADER_RETRY_AFTER}: ${retryAfter}`;
      }

      const delay = retryDelayMs(retryAfterHeader, attempt);
      warn(
        `rate limited on friends page ${page}, retrying in ${delay}ms` +
        ` (attempt ${attempt + 1}/${MAX_RETRIES})`
      );

      await sleep(delay);
    }

    if (!isSuccessResponse(response)) {
      warn(`friends page ${page} returned HTTP ${response.status}`);
      return { ids: [], morePages: false };
    }

    const parsedDoc = parseHtml(await response.text());
    const ids = parseFriendIds(parsedDoc);
    const morePages = hasNextPage(parsedDoc);
    log(`friends page ${page}: ${ids.length} friends, morePages=${morePages}`);

    return { ids, morePages };
  }

  async function fetchAllFriendIds(userId) {
    const allFriendIds = [];
    let page = 1;

    while (page <= MAX_PAGES) {
      const { ids, morePages } = await fetchFriendIdsOnPage(userId, page);
      allFriendIds.push(...ids);

      if (!morePages) {
        break;
      }

      page++;
    }

    log(`fetched ${allFriendIds.length} friends total`);
    return allFriendIds;
  }

  async function subscribeToBlog(userId) {
    const response = await gmFetch(
      HTTP_POST,
      `${BLOG_URL}/subscribe?id=${userId}`
    );

    return logAndReturn(
      response,
      `subscribed to ${userId}`,
      `failed to subscribe to ${userId}`
    );
  }

  function buildSubSummary(done, failed, startTime) {
    if (failed === 0) {
      return `done: ${done} sub'd|${formatElapsed(startTime)}`;
    }

    return `done: ${done} sub'd, ${failed} fail'd|${formatElapsed(startTime)}`;
  }

  async function subscribeToFriends(friendIds, statusElement) {
    const startTime = Date.now();
    let done = 0;
    let failed = 0;

    for (const friendId of friendIds) {
      statusElement.innerText =
        `subbin ${done + failed + 1}/${friendIds.length}|` +
        ` ${formatElapsed(startTime)}`;

      const succeeded = await subscribeToBlog(friendId);

      if (!succeeded) {
        failed++;
        await sleep(REQUEST_DELAY_MS);
        continue;
      }

      done++;
      await sleep(REQUEST_DELAY_MS);
    }

    const summary = buildSubSummary(done, failed, startTime);

    log(summary);
    statusElement.innerText = summary;
  }

  async function unsubscribeFromBlog(userId) {
    const response = await gmFetch(
      HTTP_POST,
      `${BLOG_URL}/unsubscribe?id=${userId}`
    );

    return logAndReturn(
      response,
      `unsubscribed from ${userId}`,
      `failed to unsubscribe from ${userId}`
    );
  }

  function parseSubscriptionUserIds(parsedDoc) {
    const userIds = new Set();

    for (const link of parsedDoc.querySelectorAll(SEL_SUBSCRIPTION_LINK)) {
      const userId = new URL(link.href).searchParams.get('id');
      if (userId) {
        userIds.add(userId);
      }
    }

    return userIds;
  }

  async function fetchSubscriptionsPage(page) {
    const url = `${BLOG_URL}/subscriptions?page=${page}`;
    const response = await gmFetch(HTTP_GET, url);

    if (!isSuccessResponse(response)) {
      warn(`subscriptions page ${page} returned HTTP ${response?.status}`);
      return { userIds: new Set(), morePages: false };
    }

    const parsedDoc = parseHtml(response.responseText);
    const userIds = parseSubscriptionUserIds(parsedDoc);
    const morePages = hasNextPage(parsedDoc);
    log(
      `subscriptions page ${page}: ${userIds.size} unique users,` +
      ` morePages=${morePages}`
    );

    return { userIds, morePages };
  }

  async function propagationWait(label, statusElement, controller) {
    const end = Date.now() + PROPAGATION_DELAY_MS;

    while (!controller.cancelled) {
      const remaining = Math.ceil((end - Date.now()) / MS_PER_SECOND);

      if (remaining <= 0) {
        break;
      }

      statusElement.innerText = `${label}| wait ${remaining}s`;
      await sleep(MS_PER_SECOND);
    }
  }

  // jshint ignore:start
  function findNewNonFriends(userIds, friendSet, unsubscribed) {
    return [...userIds].filter(
      (id) => !friendSet.has(id) && !unsubscribed.has(id)
    );
  }
  // jshint ignore:end

  async function runUnsubPass(
    pass,
    friendSet,
    allUnsubscribed,
    startTime,
    statusElement,
    controller
  ) {
    const unsubscribed = new Set();
    let page = 1;
    let passUnsubscribed = 0;

    while (!controller.cancelled && page <= MAX_PAGES) {
      const label =
        `${pass}.${page}: ${allUnsubscribed.size} unsub'd|` +
        ` ${formatElapsed(startTime)}`;
      statusElement.innerText = `${label}| checkin`;

      const { userIds, morePages } =
        await fetchSubscriptionsPage(page);

      if (controller.cancelled) {
        break;
      }

      const newNonFriends = findNewNonFriends(userIds, friendSet, unsubscribed);

      if (newNonFriends.length === 0) {
        if (!morePages) {
          break;
        }

        page++;
        continue;
      }

      statusElement.innerText = `${label}| unsub'd ${newNonFriends.length}`;

      for (const friendId of newNonFriends) {
        if (controller.cancelled) {
          break;
        }

        const succeeded = await unsubscribeFromBlog(friendId);

        if (succeeded) {
          unsubscribed.add(friendId);
          allUnsubscribed.add(friendId);
          passUnsubscribed++;
        }

        await sleep(REQUEST_DELAY_MS);
      }

      if (!morePages) {
        break;
      }

      page++;
    }

    return passUnsubscribed;
  }

  function buildUnsubSummary(cancelled, pass, unsubCount, startTime) {
    if (cancelled) {
      return `stop'd: ${pass}p| ${unsubCount} unsub'd|` +
        ` ${formatElapsed(startTime)}`;
    }

    return `done: ${pass}p| ${unsubCount} unsub'd| ${formatElapsed(startTime)}`;
  }

  async function unsubNonFriends(friendIds, statusElement, controller) {
    const friendSet = new Set(friendIds);
    const allUnsubscribed = new Set();
    const startTime = Date.now();
    let pass = 1;

    while (!controller.cancelled) {
      const passUnsubscribed = await runUnsubPass(
        pass,
        friendSet,
        allUnsubscribed,
        startTime,
        statusElement,
        controller
      );

      if (controller.cancelled) {
        break;
      }

      if (passUnsubscribed === 0) {
        break;
      }

      pass++;
      const passLabel =
        `p${pass - 1}: ${allUnsubscribed.size} unsub'd|` +
        ` ${formatElapsed(startTime)}`;
      await propagationWait(passLabel, statusElement, controller);
    }

    const summary = buildUnsubSummary(
      controller.cancelled, pass, allUnsubscribed.size, startTime
    );

    log(summary);
    statusElement.innerText = summary;
  }

  function setControllerCancelled(controller, isCancelled) {
    if (controller) {
      controller.cancelled = isCancelled;
    }
  }

  function setButtonsEnablement(buttons, isEnabled) {
    for (const button of buttons) {
      button.disabled = !isEnabled;
    }
  }

  function setUnsubbing(buttonRow, stopButton, isUnsubbing) {
    buttonRow.classList.toggle(CLASS_UNSUBBING, isUnsubbing);
    stopButton.disabled = !isUnsubbing;
  }

  function showError(statusElement, message) {
    warn(message);
    statusElement.innerText = message;

    const container = document.querySelector('main') || document.body;
    container.prepend(statusElement);
  }

  function createElement(tag, className) {
    const element = document.createElement(tag);
    element.className = className;

    return element;
  }

  function createButton(label, className) {
    const button = document.createElement('button');
    button.innerText = label;
    button.className = className;

    return button;
  }

  function createButtonRow(...buttons) {
    const element = createElement('div', CLASS_BUTTON_ROW);
    element.append(...buttons);

    return element;
  }

  function createStatusElement() {
    return createElement('div', CLASS_STATUS);
  }

  function onStopClick(controllerRef, stopButton, statusElement) {
    setControllerCancelled(controllerRef.value, true);
    setButtonsEnablement([stopButton], false);
    statusElement.innerText = 'stoppin...';
  }

  async function onSubscribeClick(userId, actionButtons, statusElement) {
    setButtonsEnablement(actionButtons, false);

    try {
      statusElement.innerText = 'fetchin frenz...';
      const friendIds = await fetchAllFriendIds(userId);

      if (friendIds.length === 0) {
        warn('no friends found');
        statusElement.innerText = 'no frenz found O__o';

        return;
      }

      await subscribeToFriends(friendIds, statusElement);
    } finally {
      setButtonsEnablement(actionButtons, true);
    }
  }

  async function onUnsubClick(
    userId,
    actionButtons,
    buttonRow,
    stopButton,
    controllerRef,
    statusElement
  ) {
    setButtonsEnablement(actionButtons, false);
    setUnsubbing(buttonRow, stopButton, true);
    controllerRef.value = { cancelled: false };

    try {
      const friendIds = await fetchAllFriendIds(userId);
      await unsubNonFriends(friendIds, statusElement, controllerRef.value);
    } finally {
      controllerRef.value = null;
      setUnsubbing(buttonRow, stopButton, false);
      setButtonsEnablement(actionButtons, true);
    }
  }

  window.addEventListener('load', () => {
    injectStyles();

    const statusElement = createStatusElement();
    const userId = getCurrentUserId();

    if (!userId) {
      showError(statusElement, "couldn't find user id. r u logged tf in?");
      return;
    }

    const controllerRef = { value: null };

    const subscribeButton = createButton(LABEL_SUB, CLASS_SUB);
    const unsubButton = createButton(LABEL_UNSUB, CLASS_UNSUB);
    const stopButton = createButton(LABEL_STOP, CLASS_STOP);
    const buttonRow = createButtonRow(subscribeButton, unsubButton, stopButton);

    const left = document.querySelector(SEL_LEFT_PANEL);
    const contact = left?.querySelector(SEL_CONTACT);
    if (!contact) {
      showError(statusElement, 'ui error: has spacehey updated?');
      return;
    }

    contact.after(buttonRow, statusElement);

    const actionButtons = [subscribeButton, unsubButton];

    stopButton.onclick = () =>
      onStopClick(controllerRef, stopButton, statusElement);
    subscribeButton.onclick = () =>
      onSubscribeClick(userId, actionButtons, statusElement);
    unsubButton.onclick = () => onUnsubClick(
      userId,
      actionButtons,
      buttonRow,
      stopButton,
      controllerRef,
      statusElement
    );
  },
    false
  );
})();