Twitter Direct

Remove t.co tracking links from Twitter
当前为 2020-10-03 提交的版本，查看最新版本。
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// ==UserScript==
// @name          Twitter Direct
// @description   Remove t.co tracking links from Twitter
// @author        chocolateboy
// @copyright     chocolateboy
// @version       1.0.1
// @namespace     https://github.com/chocolateboy/userscripts
// @license       GPL: https://www.gnu.org/copyleft/gpl.html
// @include       https://twitter.com/
// @include       https://twitter.com/*
// @include       https://mobile.twitter.com/
// @include       https://mobile.twitter.com/*
// @require       https://unpkg.com/@chocolateboy/uncommonjs@2.0.1/index.min.js
// @require       https://unpkg.com/get-wild@1.2.0/dist/index.umd.min.js
// @require       https://unpkg.com/just-safe-set@2.1.0/index.js
// @require       https://cdn.jsdelivr.net/gh/chocolateboy/gm-compat@a26896b85770aa853b2cdaf2ff79029d8807d0c0/index.min.js
// @run-at        document-start
// @inject-into   auto
// ==/UserScript==
 
/*
 * a pattern which matches the content-type header of responses we scan for
 * URLs: "application/json" or "application/json; charset=utf-8"
 */
const CONTENT_TYPE = /^application\/json\b/
 
/*
 * the minimum size (in bytes) of documents we deem to be "not small"
 *
 * we log misses (i.e. no URLs ever found/replaced) in documents whose size is
 * greater than or equal to this value
 *
 * if we keep failing to find URLs in large documents, we may be able to speed
 * things up by blacklisting them, at least in theory
 *
 * (in practice, URL data is optional in most of the matched document types
 * (contained in arrays that can be empty), so an absence of URLs doesn't
 * necessarily mean URL data will never be included...)
 */
const LOG_THRESHOLD = 1024
 
/*
 * an immutable array used in various places as a way to indicate "no values".
 * static to avoid unnecessary allocations.
 */
const NONE = []
 
/*
 * used to keep track of which roots (don't) have matching URIs and which URIs
 * (don't) have matching roots
 */
const STATS = { root: {}, uri: {} }
 
/*
 * the domain intercepted links are routed through
 *
 * not all links are intercepted. exceptions include links to twitter (e.g.
 * https://twitter.com) and card URIs (e.g. card://123456)
 */
const TRACKING_DOMAIN = 't.co'
 
/*
 * the domain we expect data (JSON) to come from. responses that aren't from
 * this domain are ignored.
 */
const TWITTER_API = 'api.twitter.com'
 
/*
 * default locations to search for URL metadata (arrays of objects) within tweet
 * nodes
 */
const TWEET_PATHS = [
    'entities.media',
    'entities.urls',
    'extended_entities.media',
    'extended_entities.urls',
]
 
/*
 * default locations to search for URL metadata (arrays of objects) within
 * user/profile nodes
 */
const USER_PATHS = [
    'entities.description.urls',
    'entities.url.urls',
]
 
/*
 * a router which matches URIs (pathnames) to queries. each query contains a
 * root path (required) and some additional options which specify the locations
 * under the root path to substitute URLs in.
 *
 * implemented as an array of pairs with URI-pattern keys (string(s) or
 * regexp(s)) and one or more queries as the value. if a query is a path (string
 * or array) it is converted into an object with the path as its `root`
 * property.
 *
 * options:
 *
 *   - root (required): a path (string or array of steps) into the document
 *     under which to begin searching
 *
 *   - collect (default: Object.values): a function which takes a root node and
 *     turns it into an array of context nodes to scan for URL data
 *
 *   - scan (default: USER_PATHS): an array of paths to probe for arrays of
 *     { url, expanded_url } pairs in a context node
 *
 *   - targets (default: NONE): an array of paths to standalone URLs (URLs that
 *     don't have an accompanying expansion), e.g. for URLs in cards embedded in
 *     tweets. these URLs are replaced by expanded URLs gathered during the
 *     scan.
 *
 *     target paths can point directly to a URL node (string) or to an
 *     array of objects. in the latter case, we find the URL object in the array
 *     (obj.key === "card_url") and replace its URL node (obj.value.string_value)
 *
 *     if a target path is an object containing a { url: path, expanded_url: path }
 *     pair, the URL is expanded directly in the same way as scanned paths.
 */
const MATCH = [
    [
        // e.g. '/1.1/users/lookup.json',
        /\/lookup\.json$/, {
            root: NONE, // returns self
        }
    ],
    [
        /\/Conversation$/, [
            'data.conversation_timeline.instructions.*.moduleItems.*.item.itemContent.tweet.core.user.legacy',
            'data.conversation_timeline.instructions.*.entries.*.content.items.*.item.itemContent.tweet.core.user.legacy',
            {
                root: 'data.conversation_timeline.instructions.*.moduleItems.*.item.itemContent.tweet.legacy',
                scan: TWEET_PATHS,
                targets: ['card.binding_values', 'card.url'],
            },
            {
                root: 'data.conversation_timeline.instructions.*.entries.*.content.items.*.item.itemContent.tweet.legacy',
                scan: TWEET_PATHS,
                targets: ['card.binding_values', 'card.url'],
            },
        ]
    ],
    [
        /\/Following$/,
        'data.user.following_timeline.timeline.instructions.*.entries.*.content.itemContent.user.legacy',
    ],
    [
        /\/Followers$/,
        'data.user.followers_timeline.timeline.instructions.*.entries.*.content.itemContent.user.legacy',
    ],
    [
        // used for hovercard data
        /\/UserByScreenName$/, {
            root: 'data.user.legacy',
            collect: Array.of,
        }
    ],
    [
        // DMs
        // e.g. '/1.1/dm/inbox_initial_state.json' and '/1.1/dm/user_updates.json'
        /\/(?:inbox_initial_state|user_updates)\.json$/, {
            root: 'inbox_initial_state.entries.*.message.message_data',
            scan: TWEET_PATHS,
            targets: [
                'attachment.card.binding_values.card_url.string_value',
                'attachment.card.url',
            ],
        }
    ],
    [
        // e.g. '/1.1/friends/following/list.json',
        /\/list\.json$/,
        'users.*'
    ],
]
 
/*
 * a single { pattern => queries } pair for the router which matches all URIs
 */
const WILDCARD = [
    /./,
    [
        {
            root: 'globalObjects.tweets',
            scan: TWEET_PATHS,
            targets: [{
                    url: 'card.binding_values.website_shortened_url.string_value',
                    expanded_url: 'card.binding_values.website_url.string_value',
                },
                'card.binding_values.card_url.string_value',
                'card.url',
            ],
        },
        'globalObjects.tweets.*.card.users.*',
        'globalObjects.users',
    ]
]
 
/*
 * a custom version of get-wild's `get` function which uses a simpler/faster
 * path parser since we don't use the extended syntax
 */
const get = exports.getter({ split: '.' })
 
/*
 * a helper function which returns true if the supplied value is a plain object,
 * false otherwise
 */
const isPlainObject = (function () {
    const toString = {}.toString
    return value => toString.call(value) === '[object Object]'
})()
 
/*
 * a helper function which iterates over the supplied iterable, filtering out
 * missing (undefined) values.
 *
 * this is done in one pass (rather than map + filter) as there may
 * potentially be dozens or even hundreds of values e.g. contexts (tweet/user
 * objects) under a root node
 */
function eachDefined (iterable, fn) {
    for (const value of iterable) {
        if (value) fn(value)
    }
}
 
/**
 * a helper function which returns true if the supplied URL is tracked by
 * Twitter, false otherwise
 */
function isTracked (url) {
    return (new URL(url)).hostname === TRACKING_DOMAIN
}
 
/*
 * JSON.stringify helper used to serialize stats data
 */
function replacer (_key, value) {
    return (value instanceof Set) ? Array.from(value) : value
}
 
/*
 * an iterator which returns { pattern => queries } pairs where patterns
 * are strings/regexps which match a URI and queries are objects which
 * define substitutions to perform in the matched document.
 *
 * this forms the basis of a simple "router" which tries all URI patterns
 * until one matches (or none match) and then additionally performs a
 * wildcard match which works on all URIs.
 *
 * the URI patterns are disjoint, so there's no need to try them all if one
 * matches. in addition to these, some substitutions are non URI-specific,
 * i.e. they work on documents that aren't matched by URI (e.g.
 * profile.json) and documents that are (e.g. list.json). currently the
 * latter all transform locations under obj.globalObjects, so we check for
 * the existence of that property before yielding these catch-all queries
 */
function* router (state, data) {
    for (const [key, value] of MATCH) {
        yield [key, value]
 
        if (state.matched) {
            break
        }
    }
 
    if ('globalObjects' in data) {
        yield WILDCARD
    }
}
 
/*
 * a helper class which implements document-specific (MATCH) and generic
 * (WILDCARD) URL substitutions in nodes (subtrees) within a JSON-formatted
 * document returned by the Twitter API.
 *
 * a transformer is instantiated for each query and its methods are passed a
 * context (node within the document tree) and the value of an option from the
 * query, e.g. the `scan` option is handled by the `scan` method and the
 * `targets` option is processed by the `assign` method
 */
class Transformer {
    constructor ({ onReplace, root, uri }) {
        this._cache = new Map()
        this._onReplace = onReplace
        this._root = root
        this._uri = uri
    }
 
    /*
     * expand URLs in context nodes in the locations specified by the query's
     * `scan` and `targets` options
     */
    // @ts-ignore https://github.com/microsoft/TypeScript/issues/14279
    transform (contexts, scan, targets) {
        // scan the context nodes for { url, expanded_url } pairs, replace
        // each t.co URL with its expansion, and add the mappings to the
        // cache
        eachDefined(contexts, context => this._scan(context, scan))
 
        // do a separate pass for targets because some nested card URLs are
        // expanded in other (earlier) tweets under the same root
        if (targets.length) {
            eachDefined(contexts, context => this._assign(context, targets))
        }
    }
 
    /*
     * scan the context node for { url, expanded_url } pairs, replace each t.co
     * URL with its expansion, and add the mappings to the cache
     */
    _scan (context, paths) {
        const { _cache: cache, _onReplace: onReplace } = this
 
        for (const path of paths) {
            const items = get(context, path, NONE)
 
            for (const item of items) {
                if (item.url && item.expanded_url) {
                    if (isTracked(item.url)) {
                        cache.set(item.url, item.expanded_url)
                        item.url = item.expanded_url
                        onReplace()
                    }
                } else {
                    console.warn("can't find url/expanded_url pair for:", {
                        uri: this._uri,
                        root: this._root,
                        path,
                        item,
                    })
                }
            }
        }
    }
 
    /*
     * replace URLs in the context which weren't substituted during the scan.
     *
     * these are either standalone URLs whose expansion we retrieve from the
     * cache, or URLs whose expansion exists in the context in a location not
     * covered by the scan
     */
    _assign (context, targets) {
        for (const target of targets) {
            if (isPlainObject(target)) {
                this._assignFromPath(context, target)
            } else {
                this._assignFromCache(context, target)
            }
        }
    }
 
    /*
     * replace a short URL in the context with an expanded URL defined in the
     * context.
     *
     * this is similar to the replacements performed during the scan, but rather
     * than using a fixed set of locations/property names, the paths to the
     * short/expanded URLs are supplied as a parameter
     */
    _assignFromPath (context, target) {
        const { url: urlPath, expanded_url: expandedUrlPath } = target
 
        let url, expandedUrl
 
        if (
               (url = get(context, urlPath))
            && isTracked(url)
            && (expandedUrl = get(context, expandedUrlPath))
        ) {
            this._cache.set(url, expandedUrl)
            exports.set(context, urlPath, expandedUrl)
            this._onReplace()
        }
    }
 
    /*
     * pinpoint an isolated URL in the context which doesn't have a
     * corresponding expansion, and replace it using the mappings we collected
     * during the scan
     */
    _assignFromCache (context, path) {
        let url, $context = context, $path = path
 
        const node = get(context, path)
 
        // if the target points to an array rather than a string, locate the URL
        // object within the array automatically
        if (Array.isArray(node)) {
            if ($context = node.find(it => it.key === 'card_url')) {
                $path = 'value.string_value'
                url = get($context, $path)
            }
        } else {
            url = node
        }
 
        if (typeof url === 'string' && isTracked(url)) {
            const expandedUrl = this._cache.get(url)
 
            if (expandedUrl) {
                exports.set($context, $path, expandedUrl)
                this._onReplace()
            } else {
                console.warn(`can't find expanded URL for ${url} in ${this._uri}`)
            }
        }
    }
}
 
/*
 * replace t.co URLs with the original URL in all locations in the document
 * which contain URLs
 */
function transform (data, uri) {
    let count = 0
 
    if (!STATS.uri[uri]) {
        STATS.uri[uri] = new Set()
    }
 
    const state = { matched: false }
    const it = router(state, data)
 
    for (const [key, value] of it) {
        const uris = NONE.concat(key)
        const queries = NONE.concat(value)
        const match = uris.some(want => {
            return (typeof want === 'string') ? (uri === want) : want.test(uri)
        })
 
        if (match) {
            // stop matching URIs and switch to the wildcard queries
            state.matched = true
        } else {
            // try the next URI pattern, or switch to the wildcard queries if
            // there are no more patterns to match against
            continue
        }
 
        for (const $query of queries) {
            const query = isPlainObject($query) ? $query : { root: $query }
            const { root: rootPath } = query
 
            if (!STATS.root[rootPath]) {
                STATS.root[rootPath] = new Set()
            }
 
            const root = get(data, rootPath)
 
            // may be an array (e.g. lookup.json)
            if (!root || typeof root !== 'object') {
                continue
            }
 
            const {
                collect = Object.values,
                scan = USER_PATHS,
                targets = NONE,
            } = query
 
            const updateStats = () => {
                ++count
                STATS.uri[uri].add(rootPath)
                STATS.root[rootPath].add(uri)
            }
 
            const contexts = collect(root)
 
            const transformer = new Transformer({
                onReplace: updateStats,
                root: rootPath,
                uri
            })
 
            // @ts-ignore https://github.com/microsoft/TypeScript/issues/14279
            transformer.transform(contexts, scan, targets)
        }
    }
 
    return count
}
 
/*
 * replacement for Twitter's default response handler. we transform the response
 * if it's a) JSON and b) contains URL data; otherwise, we leave it unchanged
 */
function onResponse (xhr, uri) {
    const contentType = xhr.getResponseHeader('Content-Type')
 
    if (!CONTENT_TYPE.test(contentType)) {
        return
    }
 
    const url = new URL(uri)
 
    // exclude e.g. the config-<date>.json file from pbs.twimg.com, which is the
    // second biggest document (~500K) after home_latest.json (~700K)
    if (url.hostname !== TWITTER_API) {
        return
    }
 
    const json = xhr.responseText
    const size = json.length
 
    // fold URIs which differ only in the user ID, e.g.:
    // /2/timeline/profile/1234.json -> /2/timeline/profile.json
    const path = url.pathname.replace(/\/\d+\.json$/, '.json')
 
    let data
 
    try {
        data = JSON.parse(json)
    } catch (e) {
        console.error(`Can't parse JSON for ${uri}:`, e)
        return
    }
 
    const oldStats = JSON.stringify(STATS, replacer)
    const count = transform(data, path)
 
    if (!count) {
        if (STATS.uri[path].size === 0 && size >= LOG_THRESHOLD) {
            console.debug(`no replacements in ${path} (${size} B)`)
        }
 
        return
    }
 
    const descriptor = { value: JSON.stringify(data) }
    const clone = GMCompat.export(descriptor)
 
    GMCompat.unsafeWindow.Object.defineProperty(xhr, 'responseText', clone)
 
    const newStats = JSON.stringify(STATS, replacer)
 
    if (newStats !== oldStats) {
        const replacements = 'replacement' + (count === 1 ? '' : 's')
        console.debug(`${count} ${replacements} in ${path} (${size} B)`)
        console.log(JSON.parse(newStats))
    }
}
 
/*
 * replace the built-in XHR#send method with our custom version which swaps in
 * our custom response handler. once done, we delegate to the original handler
 * (this.onreadystatechange)
 */
function hookXHRSend (oldSend) {
    return /** @this {XMLHttpRequest} */ function send () {
        const oldOnReadyStateChange = this.onreadystatechange
 
        this.onreadystatechange = function () {
            if (this.readyState === this.DONE && this.responseURL && this.status === 200) {
                onResponse(this, this.responseURL)
            }
 
            if (oldOnReadyStateChange) {
                // @ts-ignore
                return oldOnReadyStateChange.apply(this, arguments)
            }
        }
 
        return oldSend.apply(this, arguments)
    }
}
 
/*
 * replace the default XHR#send with our custom version, which scans responses
 * for tweets and expands their URLs
 */
GMCompat.unsafeWindow.XMLHttpRequest.prototype.send = GMCompat.export(
    hookXHRSend(XMLHttpRequest.prototype.send)
)
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