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interceptor.js
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/***
*
* Mastodon Handles in Twitter!
*
* This extension works by intercepting the XHRequests used by the twitter frontend and scraping them for user info.
* Using this list we can search for anything that resembles a mastodon handle in a users name, bio or their links.
* This entire extension is inspired by Debirdify (https://pruvisto.org/debirdify/) which I found very helpful.
*
* ***/
{
console.debug('Mastodon Handles Extension loaded!');
const MASTODON_ICON_CLASS_NAME = 'EXTENSION_MASTODON_HANDLES_mastodonIcon';
// From Debirdify: https://github.com/pruvisto/debirdify/blob/main/main/extract_mastodon_ids.py
// Matches anything of the form @[email protected] or [email protected] or [email protected] or foo@barmastodontld
// We do not match everything of the form foo@bar or [email protected] to avoid false positives like email addresses
const M_ID_PATTERN_STRICT = /(@|🐘|Mastodon:?)?\s*?([\w\-\.]+@[\w\-\.]+\.[\w\-\.]+)/gi;
const M_ID_PATTERN_LOOSE = /\b((http:\/\/|https:\/\/)?([\w\-\.]+\.[\w\-\.]+)\/(web\/)?@([\w\-\.]+))\/?\b/gi;
const M_URL_PATTERN = /^\/(@|web\/@?)([\w\-\.]+)(\/.*|[.:,;!?()\[\]{}].*)?$/gi;
const FORBIDDEN_HOSTS = ['tiktok.com', 'youtube.com', 'medium.com', 'skeb.jp', 'pronouns.page', 'foundation.app', 'gamejolt.com', 'traewelling.de', 'observablehq.com', 'gmail.com', 'hotmail.com', 'manylink.co', 'withkoji.com', 'twitter.com', 'nomadlist.com', 'figma.com', 'peakd.com', 'jabber.ccc.de', 'yahoo.com', 'aol.com', 'vice.com', 'wsj.com', 'theguardian.com', 'cbsnews.com', 'cnn.com', 'welt.de', 'nytimes.com', 'gmx.de', 'web.de', 'posteo.de', 'arcor.de', 'bell.net'];
const KNOWN_HOSTS = ['mas.to', 'wandering.shop', 'peoplemaking.games', 'todon.eu', 'tilde.zone', 'libretooth.gr', 'metalhead.club', 'lor.sh', 'mathstodon.xyz', 'fosstodon.org', 'masto.ai', 'ravenation.club', 'qoto.org', 'primarycare.app', 'socel.net', 'ioc.exchange', 'hachyderm.io', 'universeodon.com', 'pettingzoo.co', 'masto.nu', 'infosec.exchange'];
const HOST_HEURISTIC_KEYWORDS = ['social', 'masto', 'mastodon', 'space', 'fedi', 'toot', 'mstdn'];
const FEDIVERSE_KEYWORDS = ['mastodon', 'toot', 'tröt', 'fedi', '🦣']; // Todo: Add other fediverse services: https://en.wikipedia.org/wiki/Fediverse
// https://materialdesignicons.com/icon/mastodon
const MASTODON_ICON_SVG_NODE = new DOMParser().parseFromString(`
<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" class="${MASTODON_ICON_CLASS_NAME}">
<path fill="currentColor" d="M20.94,14C20.66,15.41 18.5,16.96 15.97,17.26C14.66,17.41 13.37,17.56 12,17.5C9.75,17.39 8,16.96 8,16.96V17.58C8.32,19.8 10.22,19.93 12.03,20C13.85,20.05 15.47,19.54 15.47,19.54L15.55,21.19C15.55,21.19 14.27,21.87 12,22C10.75,22.07 9.19,21.97 7.38,21.5C3.46,20.45 2.78,16.26 2.68,12L2.67,8.57C2.67,4.23 5.5,2.96 5.5,2.96C6.95,2.3 9.41,2 11.97,2H12.03C14.59,2 17.05,2.3 18.5,2.96C18.5,2.96 21.33,4.23 21.33,8.57C21.33,8.57 21.37,11.78 20.94,14M18,8.91C18,7.83 17.7,7 17.15,6.35C16.59,5.72 15.85,5.39 14.92,5.39C13.86,5.39 13.05,5.8 12.5,6.62L12,7.5L11.5,6.62C10.94,5.8 10.14,5.39 9.07,5.39C8.15,5.39 7.41,5.72 6.84,6.35C6.29,7 6,7.83 6,8.91V14.17H8.1V9.06C8.1,8 8.55,7.44 9.46,7.44C10.46,7.44 10.96,8.09 10.96,9.37V12.16H13.03V9.37C13.03,8.09 13.53,7.44 14.54,7.44C15.44,7.44 15.89,8 15.89,9.06V14.17H18V8.91Z" />
</svg>`, 'image/svg+xml').documentElement;
const $ = (query, parent = document) => parent.querySelector(query);
const $$ = (query, parent = document) => Array.from(parent.querySelectorAll(query));
const usersStore = {};
window['___EXTENSION_MASTODON_HANDLES_TWITTER_USERS_STORE'] = usersStore;
const origOpen = XMLHttpRequest.prototype.open;
XMLHttpRequest.prototype.open = function () {
this.addEventListener('load', function () { onResponse(this); });
origOpen.apply(this, arguments);
};
const parseXHRResponse = (xhrRes) => {
try {
return JSON.parse(xhrRes.responseText);
}
catch (e) {
return null;
}
};
const onResponse = (xhrRes) => {
if (xhrRes.status !== 200)
return;
if (xhrRes.responseURL?.includes('all.json'))
handleJSONResponseWithUsers(xhrRes);
if (xhrRes.responseURL?.includes('home.json'))
handleJSONResponseWithUsers(xhrRes);
if (xhrRes.responseURL?.includes('adaptive.json'))
handleJSONResponseWithUsers(xhrRes);
if (xhrRes.responseURL?.includes('guide.json'))
handleJSONResponseWithUsers(xhrRes);
if (xhrRes.responseURL?.includes('recommendations.json'))
handleRecommendationsResponse(xhrRes);
if (xhrRes.responseURL?.includes('HomeTimeline'))
handleLatestTweetsResponse(xhrRes);
if (xhrRes.responseURL?.includes('HomeLatestTimeline'))
handleLatestTweetsResponse(xhrRes);
if (xhrRes.responseURL?.includes('CommunitiesMainPageTimeline'))
handleCommunityTimelineResponse(xhrRes);
if (xhrRes.responseURL?.includes('UserTweets'))
handleUserTimelineResponse(xhrRes);
if (xhrRes.responseURL?.includes('UserTweetsAndReplies'))
handleUserTimelineResponse(xhrRes);
if (xhrRes.responseURL?.includes('UserMedia'))
handleUserTimelineResponse(xhrRes);
if (xhrRes.responseURL?.includes('Likes'))
handleUserTimelineResponse(xhrRes);
if (xhrRes.responseURL?.includes('Bookmarks'))
handleBookmarksResponse(xhrRes);
if (xhrRes.responseURL?.includes('TweetDetail'))
handleTweetDetailResponse(xhrRes);
if (xhrRes.responseURL?.includes('Followers'))
handleFollowersResponse(xhrRes);
if (xhrRes.responseURL?.includes('Following'))
handleFollowersResponse(xhrRes);
if (xhrRes.responseURL?.includes('ConnectTabTimeline'))
handleConnectTabTimelineResponse(xhrRes);
};
const handleJSONResponseWithUsers = (xhrRes) => {
const res = parseXHRResponse(xhrRes);
Object.entries(res?.globalObjects?.users || {}).forEach(([, user]) => {
extractDataFromLegacyUserObject(user);
});
};
const handleLatestTweetsResponse = (xhrRes) => {
const res = parseXHRResponse(xhrRes);
const graphqlInstructions = res?.data?.home?.home_timeline_urt?.instructions;
if (graphqlInstructions)
extractUsersFromGraphqlInstructions(graphqlInstructions);
};
const handleCommunityTimelineResponse = (xhrRes) => {
const res = parseXHRResponse(xhrRes);
const graphqlInstructions = res?.data?.viewer?.communities_timeline?.timeline?.instructions;
if (graphqlInstructions)
extractUsersFromGraphqlInstructions(graphqlInstructions);
};
const handleUserTimelineResponse = (xhrRes) => {
const res = parseXHRResponse(xhrRes);
const graphqlInstructions = res?.data?.user?.result?.timeline_v2?.timeline?.instructions;
if (graphqlInstructions)
extractUsersFromGraphqlInstructions(graphqlInstructions);
};
const handleBookmarksResponse = (xhrRes) => {
const res = parseXHRResponse(xhrRes);
const graphqlInstructions = res?.data?.bookmark_timeline_v2?.timeline?.instructions;
if (graphqlInstructions)
extractUsersFromGraphqlInstructions(graphqlInstructions);
};
const handleTweetDetailResponse = (xhrRes) => {
const res = parseXHRResponse(xhrRes);
const graphqlInstructions = res?.data?.threaded_conversation_with_injections_v2?.instructions;
if (graphqlInstructions)
extractUsersFromGraphqlInstructions(graphqlInstructions);
};
const handleFollowersResponse = (xhrRes) => {
const res = parseXHRResponse(xhrRes);
const graphqlInstructions = res?.data?.user?.result?.timeline?.timeline?.instructions;
if (graphqlInstructions)
extractUsersFromGraphqlInstructions(graphqlInstructions);
};
const handleRecommendationsResponse = (xhrRes) => {
const res = parseXHRResponse(xhrRes);
res?.forEach?.((tokenizedUser) => {
if (tokenizedUser?.user)
extractDataFromLegacyUserObject(tokenizedUser.user);
});
};
const handleConnectTabTimelineResponse = (xhrRes) => {
const res = parseXHRResponse(xhrRes);
const graphqlInstructions = res?.data?.connect_tab_timeline?.timeline?.instructions;
if (graphqlInstructions)
extractUsersFromGraphqlInstructions(graphqlInstructions);
};
const extractUsersFromGraphqlInstructions = (instructions) => {
instructions?.forEach((instruction) => {
instruction?.entries?.forEach((entry) => {
const tweetResult = entry?.content?.itemContent?.tweet_results?.result;
if (tweetResult)
extractUsersFromTweetResult(tweetResult);
const legacyUserResult = entry?.content?.itemContent?.user_results?.result?.legacy;
if (legacyUserResult)
extractDataFromLegacyUserObject(legacyUserResult);
entry?.content?.items?.forEach((item) => {
const tweetResult = item?.item?.itemContent?.tweet_results?.result;
if (tweetResult)
extractUsersFromTweetResult(tweetResult);
const legacyUserResult = item?.item?.itemContent?.user_results?.result?.legacy;
if (legacyUserResult)
extractDataFromLegacyUserObject(legacyUserResult);
});
});
});
};
const extractUsersFromTweetResult = (tweetResult) => {
const legacyUser = (tweetResult?.core || tweetResult?.tweet?.core)?.user_results?.result?.legacy;
if (legacyUser)
extractDataFromLegacyUserObject(legacyUser);
const retweetResult = tweetResult?.legacy?.retweeted_status_result?.result;
if (retweetResult)
extractUsersFromTweetResult(retweetResult);
const quotedTweetUser = tweetResult?.quoted_status_result?.result?.core?.user_results?.result?.legacy;
if (quotedTweetUser)
extractDataFromLegacyUserObject(quotedTweetUser);
};
const extractDataFromLegacyUserObject = (legacyUser) => {
const userEntry = {
twitterHandle: legacyUser.screen_name,
twitterId: legacyUser.id_str,
mentionsFediverse: userMentionsFediverse(legacyUser),
};
// Look through username, any links and the user bio. Todo: Pinned tweets.
const mastodonHandle = findMastodonHandle(legacyUser.name) ||
findMastodonHandleInUrls(getLinkedUrlsFromLegacyUser(legacyUser)) ||
findMastodonHandle(legacyUser.description || '');
if (mastodonHandle) {
userEntry.mastodonHandle = mastodonHandle;
userEntry.mastodonUrl = mastodonHandleToInstanceUrl(mastodonHandle);
}
usersStore[legacyUser.screen_name] = userEntry;
};
const userMentionsFediverse = (legacyUser) => {
return [legacyUser?.description, legacyUser?.name, ...getLinkedUrlsFromLegacyUser(legacyUser)]
.some(str => FEDIVERSE_KEYWORDS.some(keyword => str?.toLowerCase().includes(keyword)));
};
// Parse Mastodon IDs of the form @[email protected] or [email protected]
const findMastodonHandle = (str) => {
if (str == null)
return null;
try {
const matches = [...str.matchAll(M_ID_PATTERN_STRICT)].find((match) => !!match?.[2]);
if (matches && matches.length >= 3) {
const [, prefix, dirtyHandle] = matches;
const handle = dirtyHandle.trim();
const strict = !prefix;
if (validateMastodonHandle(`@${handle}`, strict)) {
return `@${handle}`;
}
}
else {
const matches = [...str.matchAll(M_ID_PATTERN_LOOSE)].find((match) => !!match?.[5]);
if (matches && matches.length >= 6) {
const host = matches[3].trim();
const id = matches[5].trim();
const handle = `@${id}@${host}`;
if (validateMastodonHandle(handle, true)) {
return handle;
}
}
}
return null;
}
catch (e) {
console.error(`Mastodon Extension: Threw while resolving mastodon handle for twitter handle: "${str}"`);
throw e;
}
};
const findMastodonHandleInUrls = (urls) => {
try {
for (const url of urls.map(u => new URL(u))) {
const host = url.host;
const [, , nameNoAt] = [...url.pathname.matchAll(M_URL_PATTERN)].find((match) => !!match?.[2]) || [];
if (!nameNoAt)
continue;
const mastodonHandle = `@${nameNoAt}@${host}`;
if (validateMastodonHandle(mastodonHandle, true)) {
return mastodonHandle;
}
}
return null;
}
catch (e) {
console.error(`Mastodon Extension: Threw while resolving mastodon handle for urls: "${urls}"`);
throw e;
}
};
const isValidMastodonId = (str) => /[\w\-\.]+/.test(str);
const matchesHostHeuristics = (str) => {
return HOST_HEURISTIC_KEYWORDS.some(keyword => str.includes(keyword));
};
const validateHost = (host, strict = true) => {
const str = host.toLowerCase();
if (FORBIDDEN_HOSTS.includes(str))
return false;
if (!strict)
return true;
if (KNOWN_HOSTS.includes(str))
return true;
if (matchesHostHeuristics(str))
return true;
return false;
};
// Expects @[email protected]
const validateMastodonHandle = (handle, strict = true) => {
const split = handle.split('@');
if (split.length !== 3)
return false;
const [, name, host] = split;
return isValidMastodonId(name) && validateHost(host, strict);
};
const getLinkedUrlsFromLegacyUser = (user) => {
const urls = [];
urls.push(...(user?.entities?.url?.urls?.map((u) => u.expanded_url) || []));
urls.push(...(user?.entities?.description?.urls?.map((u) => u.expanded_url) || []));
urls.push(...(user?.entities?.location?.urls?.map((u) => u.expanded_url) || []));
return urls.filter(Boolean);
};
const mastodonHandleToInstanceUrl = (mastodonHandle) => {
const [username, host] = mastodonHandle.split('@').filter(Boolean);
return `https://${host}/@${username}`;
};
/*** Insert into UI ***/
const idleInterval = (fn, t) => {
let idleCallback = null;
const interval = setInterval(() => {
if (idleCallback)
cancelIdleCallback(idleCallback);
idleCallback = requestIdleCallback(() => {
idleCallback = null;
fn();
});
}, t);
return function abort() {
if (idleCallback)
cancelIdleCallback(idleCallback);
clearInterval(interval);
};
};
idleInterval(() => addIconToHandles(), 1000);
const addIconToHandles = () => {
const potentialUserHandles = document.evaluate("//span[starts-with(., '@')]", document, null, XPathResult.UNORDERED_NODE_ITERATOR_TYPE, null);
const twitterHandleElements = mapXPathResult(potentialUserHandles, (el) => el);
twitterHandleElements.forEach((el) => {
const twitterHandle = el.textContent.substring(1); // Remove @
const user = usersStore[twitterHandle];
if (!user)
return;
tryAsTweet(el, user);
tryAsTweetSpotlight(el, user);
tryAsUserCell(el, user);
});
};
const findParentElement = (node, predicate, maxDepth = Infinity) => {
let depth = 0;
let target = node;
while (target && depth <= maxDepth) {
if (predicate(target))
return target;
target = target.parentElement;
depth++;
}
return null;
};
const tryAsTweet = (el, user) => {
try {
if (el.dataset.hasTwitterPromotion)
return;
const mastodonIconElement = createMastodonIconElement(user);
if (!mastodonIconElement)
return;
const wrapper = findParentElement(el, (el) => !!el.textContent?.startsWith(`@${user.twitterHandle}·`) && !!el.querySelector('time'), 6);
if (!wrapper)
return;
wrapper.appendChild(createTwitterSeparatorElement());
wrapper.appendChild(mastodonIconElement);
el.dataset.hasTwitterPromotion = 'true';
}
catch (e) { /* ... */ }
};
const tryAsTweetSpotlight = (el, user) => {
try {
if (el.dataset.hasTwitterPromotion)
return;
const mastodonIconElement = createMastodonIconElement(user);
if (!mastodonIconElement)
return;
const wrapper = el.closest(`[data-testid="User-Names"] a[href="/${user.twitterHandle}"]`)?.parentElement?.parentElement;
if (!wrapper)
return;
wrapper.appendChild(createTwitterSeparatorElement());
wrapper.appendChild(mastodonIconElement);
el.dataset.hasTwitterPromotion = 'true';
}
catch (e) { /* ... */ }
};
const tryAsUserCell = (el, user) => {
try {
if (el.dataset.hasTwitterPromotion)
return;
const mastodonIconElement = createMastodonIconElement(user);
if (!mastodonIconElement)
return;
const wrapper = el.closest(`[data-testid="UserCell"] a[href="/${user.twitterHandle}"]`)?.parentElement?.parentElement;
if (!wrapper)
return;
wrapper.appendChild(createTwitterSeparatorElement());
wrapper.appendChild(mastodonIconElement);
el.dataset.hasTwitterPromotion = 'true';
}
catch (e) { /* ... */ }
};
const mapXPathResult = (iter, fn) => {
const result = [];
let item = iter.iterateNext();
while (item) {
result.push(fn(item));
item = iter.iterateNext();
}
return result;
};
const createMastodonIconElement = (user) => {
let element = null;
if (user.mastodonUrl) {
element = document.createElement('a');
element.href = user.mastodonUrl;
element.target = '_blank';
if (user.mastodonHandle) {
element.title = user.mastodonHandle;
}
}
else if (user.mentionsFediverse) {
element = document.createElement('a');
element.href = `https://twitter.com/${user.twitterHandle}`;
}
if (element) {
element.appendChild(MASTODON_ICON_SVG_NODE.cloneNode(true));
}
return element;
};
const createTwitterSeparatorElement = () => {
const span = document.createElement('span');
span.textContent = '·';
const wrapper = document.createElement('div');
wrapper.setAttribute('aria-hidden', 'true');
wrapper.style.color = 'rgb(113, 118, 123)';
wrapper.style.padding = '0 4px';
wrapper.style.fontSize = '15px';
wrapper.style.lineHeight = '20px';
wrapper.style.fontFamily = "'TwitterChirp', sans-serif";
wrapper.appendChild(span);
return wrapper;
};
}