deno.land / x / grammy@v1.22.4 / filter.ts
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type FilterFunction<C extends Context, D extends C> = (ctx: C) => ctx is D;
const filterQueryCache = new Map<string, (ctx: Context) => boolean>();
// === Obtain O(1) filter function from query/** * > This is an advanced function of grammY. * * Takes a filter query and turns it into a predicate function that can check in * constant time whether a given context object satisfies the query. The created * predicate can be passed to `bot.filter` and will narrow down the context * accordingly. * * This function is used internally by `bot.on` but exposed for advanced usage * like the following. * ```ts * // Listens for updates except forwards of messages or channel posts * bot.drop(matchFilter(':forward_origin'), ctx => { ... }) * ``` * * Check out the * [documentation](https://doc.deno.land/https://deno.land/x/grammy/mod.ts/~/Composer) * of `bot.on` for examples. In addition, the * [website](https://grammy.dev/guide/filter-queries.html) contains more * information about how filter queries work in grammY. * * @param filter A filter query or an array of filter queries */export function matchFilter<C extends Context, Q extends FilterQuery>( filter: Q | Q[],): FilterFunction<C, Filter<C, Q>> { const queries = Array.isArray(filter) ? filter : [filter]; const key = queries.join(","); const predicate = filterQueryCache.get(key) ?? (() => { const parsed = parse(queries); const pred = compile(parsed); filterQueryCache.set(key, pred); return pred; })(); return (ctx: C): ctx is Filter<C, Q> => predicate(ctx);}
export function parse(filter: FilterQuery | FilterQuery[]): string[][] { return Array.isArray(filter) ? filter.map((q) => q.split(":")) : [filter.split(":")];}
function compile(parsed: string[][]): (ctx: Context) => boolean { const preprocessed = parsed.flatMap((q) => check(q, preprocess(q))); const ltree = treeify(preprocessed); const predicate = arborist(ltree); // arborists check trees return (ctx) => !!predicate(ctx.update, ctx);}
export function preprocess(filter: string[]): string[][] { const valid: any = UPDATE_KEYS; const expanded = [filter] // expand L1 .flatMap((q) => { const [l1, l2, l3] = q; // only expand if shortcut is given if (!(l1 in L1_SHORTCUTS)) return [q]; // only expand for at least one non-empty part if (!l1 && !l2 && !l3) return [q]; // perform actual expansion const targets = L1_SHORTCUTS[l1 as L1Shortcuts]; const expanded = targets.map((s) => [s, l2, l3]); // assume that bare L1 expansions are always correct if (l2 === undefined) return expanded; // only filter out invalid expansions if we don't do this later if (l2 in L2_SHORTCUTS && (l2 || l3)) return expanded; // filter out invalid expansions, e.g. `channel_post:new_chat_member` for empty L1 return expanded.filter(([s]) => !!valid[s]?.[l2]); }) // expand L2 .flatMap((q) => { const [l1, l2, l3] = q; // only expand if shortcut is given if (!(l2 in L2_SHORTCUTS)) return [q]; // only expand for at least one non-empty part if (!l2 && !l3) return [q]; // perform actual expansion const targets = L2_SHORTCUTS[l2 as L2Shortcuts]; const expanded = targets.map((s) => [l1, s, l3]); // assume that bare L2 expansions are always correct if (l3 === undefined) return expanded; // filter out invalid expansions return expanded.filter(([, s]) => !!valid[l1]?.[s]?.[l3]); }); if (expanded.length === 0) { throw new Error( `Shortcuts in '${ filter.join(":") }' do not expand to any valid filter query`, ); } return expanded;}
function check(original: string[], preprocessed: string[][]): string[][] { if (preprocessed.length === 0) throw new Error("Empty filter query given"); const errors = preprocessed .map(checkOne) .filter((r): r is string => r !== true); if (errors.length === 0) return preprocessed; else if (errors.length === 1) throw new Error(errors[0]); else { throw new Error( `Invalid filter query '${ original.join(":") }'. There are ${errors.length} errors after expanding the contained shortcuts: ${ errors.join("; ") }`, ); }}function checkOne(filter: string[]): string | true { const [l1, l2, l3, ...n] = filter; if (l1 === undefined) return "Empty filter query given"; if (!(l1 in UPDATE_KEYS)) { const permitted = Object.keys(UPDATE_KEYS); return `Invalid L1 filter '${l1}' given in '${filter.join(":")}'. \Permitted values are: ${permitted.map((k) => `'${k}'`).join(", ")}.`; } if (l2 === undefined) return true; const l1Obj: any = UPDATE_KEYS[l1 as keyof S]; if (!(l2 in l1Obj)) { const permitted = Object.keys(l1Obj); return `Invalid L2 filter '${l2}' given in '${filter.join(":")}'. \Permitted values are: ${permitted.map((k) => `'${k}'`).join(", ")}.`; } if (l3 === undefined) return true; const l2Obj = l1Obj[l2]; if (!(l3 in l2Obj)) { const permitted = Object.keys(l2Obj); return `Invalid L3 filter '${l3}' given in '${filter.join(":")}'. ${ permitted.length === 0 ? `No further filtering is possible after '${l1}:${l2}'.` : `Permitted values are: ${ permitted.map((k) => `'${k}'`).join(", ") }.` }`; } if (n.length === 0) return true; return `Cannot filter further than three levels, ':${ n.join(":") }' is invalid!`;}interface LTree { [l1: string]: { [l2: string]: Set<string> };}function treeify(paths: string[][]): LTree { const tree: LTree = {}; for (const [l1, l2, l3] of paths) { const subtree = (tree[l1] ??= {}); if (l2 !== undefined) { const set = (subtree[l2] ??= new Set()); if (l3 !== undefined) set.add(l3); } } return tree;}
type Pred = (obj: any, ctx: Context) => boolean;function or(left: Pred, right: Pred): Pred { return (obj, ctx) => left(obj, ctx) || right(obj, ctx);}function concat(get: Pred, test: Pred): Pred { return (obj, ctx) => { const nextObj = get(obj, ctx); return nextObj && test(nextObj, ctx); };}function leaf(pred: Pred): Pred { return (obj, ctx) => pred(obj, ctx) != null;}function arborist(tree: LTree): Pred { const l1Predicates = Object.entries(tree).map(([l1, subtree]) => { const l1Pred: Pred = (obj) => obj[l1]; const l2Predicates = Object.entries(subtree).map(([l2, set]) => { const l2Pred: Pred = (obj) => obj[l2]; const l3Predicates = Array.from(set).map((l3) => { const l3Pred: Pred = l3 === "me" // special handling for `me` shortcut ? (obj, ctx) => { const me = ctx.me.id; return testMaybeArray(obj, (u) => u.id === me); } : (obj) => testMaybeArray(obj, (e) => e[l3] || e.type === l3); return l3Pred; }); return l3Predicates.length === 0 ? leaf(l2Pred) : concat(l2Pred, l3Predicates.reduce(or)); }); return l2Predicates.length === 0 ? leaf(l1Pred) : concat(l1Pred, l2Predicates.reduce(or)); }); if (l1Predicates.length === 0) { throw new Error("Cannot create filter function for empty query"); } return l1Predicates.reduce(or);}
function testMaybeArray<T>(t: T | T[], pred: (t: T) => boolean): boolean { const p = (x: T) => x != null && pred(x); return Array.isArray(t) ? t.some(p) : p(t);}
// === Define a structure to validate the queries// L3const ENTITY_KEYS = { mention: {}, hashtag: {}, cashtag: {}, bot_command: {}, url: {}, email: {}, phone_number: {}, bold: {}, italic: {}, underline: {}, strikethrough: {}, spoiler: {}, code: {}, pre: {}, text_link: {}, text_mention: {}, custom_emoji: {},} as const;const USER_KEYS = { me: {}, is_bot: {}, is_premium: {}, added_to_attachment_menu: {},} as const;const FORWARD_ORIGIN_KEYS = { user: {}, hidden_user: {}, chat: {}, channel: {},} as const;const STICKER_KEYS = { is_video: {}, is_animated: {}, premium_animation: {},} as const;const REACTION_KEYS = { emoji: {}, custom_emoji: {},} as const;
// L2const COMMON_MESSAGE_KEYS = { forward_origin: FORWARD_ORIGIN_KEYS, is_topic_message: {}, is_automatic_forward: {}, business_connection_id: {},
text: {}, animation: {}, audio: {}, document: {}, photo: {}, sticker: STICKER_KEYS, story: {}, video: {}, video_note: {}, voice: {}, contact: {}, dice: {}, game: {}, poll: {}, venue: {}, location: {},
entities: ENTITY_KEYS, caption_entities: ENTITY_KEYS, caption: {},
has_media_spoiler: {},
new_chat_title: {}, new_chat_photo: {}, delete_chat_photo: {}, message_auto_delete_timer_changed: {}, pinned_message: {}, invoice: {}, proximity_alert_triggered: {}, video_chat_scheduled: {}, video_chat_started: {}, video_chat_ended: {}, video_chat_participants_invited: {}, web_app_data: {},} as const;const MESSAGE_KEYS = { ...COMMON_MESSAGE_KEYS,
sender_boost_count: {},
new_chat_members: USER_KEYS, left_chat_member: USER_KEYS, group_chat_created: {}, supergroup_chat_created: {}, migrate_to_chat_id: {}, migrate_from_chat_id: {}, successful_payment: {}, boost_added: {}, users_shared: {}, chat_shared: {}, connected_website: {}, write_access_allowed: {}, passport_data: {}, forum_topic_created: {}, forum_topic_edited: { name: {}, icon_custom_emoji_id: {} }, forum_topic_closed: {}, forum_topic_reopened: {}, general_forum_topic_hidden: {}, general_forum_topic_unhidden: {},} as const;const CHANNEL_POST_KEYS = { ...COMMON_MESSAGE_KEYS, channel_chat_created: {},} as const;const BUSINESS_CONNECTION_KEYS = { can_reply: {}, is_enabled: {},} as const;const MESSAGE_REACTION_KEYS = { old_reaction: REACTION_KEYS, new_reaction: REACTION_KEYS,} as const;const MESSAGE_REACTION_COUNT_UPDATED_KEYS = { reactions: REACTION_KEYS,} as const;const CALLBACK_QUERY_KEYS = { data: {}, game_short_name: {} } as const;const CHAT_MEMBER_UPDATED_KEYS = { from: USER_KEYS } as const;
// L1const UPDATE_KEYS = { message: MESSAGE_KEYS, edited_message: MESSAGE_KEYS, channel_post: CHANNEL_POST_KEYS, edited_channel_post: CHANNEL_POST_KEYS, business_connection: BUSINESS_CONNECTION_KEYS, business_message: MESSAGE_KEYS, edited_business_message: MESSAGE_KEYS, deleted_business_messages: {}, inline_query: {}, chosen_inline_result: {}, callback_query: CALLBACK_QUERY_KEYS, shipping_query: {}, pre_checkout_query: {}, poll: {}, poll_answer: {}, my_chat_member: CHAT_MEMBER_UPDATED_KEYS, chat_member: CHAT_MEMBER_UPDATED_KEYS, chat_join_request: {}, message_reaction: MESSAGE_REACTION_KEYS, message_reaction_count: MESSAGE_REACTION_COUNT_UPDATED_KEYS, chat_boost: {}, removed_chat_boost: {},} as const;
// === Build up all possible filter queries from the above validation structuretype KeyOf<T> = string & keyof T; // Emulate `keyofStringsOnly`
// Suggestion building base structuretype S = typeof UPDATE_KEYS;
// E.g. 'message' suggestionstype L1S = KeyOf<S>;// E.g. 'message:entities' suggestionstype L2S<L1 extends L1S = L1S> = L1 extends unknown ? `${L1}:${KeyOf<S[L1]>}` : never;// E.g. 'message:entities:url' suggestionstype L3S<L1 extends L1S = L1S> = L1 extends unknown ? L3S_<L1> : never;type L3S_< L1 extends L1S, L2 extends KeyOf<S[L1]> = KeyOf<S[L1]>,> = L2 extends unknown ? `${L1}:${L2}:${KeyOf<S[L1][L2]>}` : never;// Suggestions for all three combinedtype L123 = L1S | L2S | L3S;// E.g. 'message::url' generationtype InjectShortcuts<Q extends L123 = L123> = Q extends `${infer L1}:${infer L2}:${infer L3}` ? `${CollapseL1<L1, L1Shortcuts>}:${CollapseL2<L2, L2Shortcuts>}:${L3}` : Q extends `${infer L1}:${infer L2}` ? `${CollapseL1<L1, L1Shortcuts>}:${CollapseL2<L2>}` : CollapseL1<Q>;// Add L1 shortcutstype CollapseL1< Q extends string, L extends L1Shortcuts = Exclude<L1Shortcuts, "">,> = | Q | (L extends string ? Q extends typeof L1_SHORTCUTS[L][number] ? L : never : never);// Add L2 shortcutstype CollapseL2< Q extends string, L extends L2Shortcuts = Exclude<L2Shortcuts, "">,> = | Q | (L extends string ? Q extends typeof L2_SHORTCUTS[L][number] ? L : never : never);// All queriestype ComputeFilterQueryList = InjectShortcuts;
/** * Represents a filter query that can be passed to `bot.on`. There are three * different kinds of filter queries: Level 1, Level 2, and Level 3. Check out * the [website](https://grammy.dev/guide/filter-queries.html) to read about how * filter queries work in grammY, and how to use them. * * Here are three brief examples: * ```ts * // Listen for messages of any type (Level 1) * bot.on('message', ctx => { ... }) * // Listen for audio messages only (Level 2) * bot.on('message:audio', ctx => { ... }) * // Listen for text messages that have a URL entity (Level 3) * bot.on('message:entities:url', ctx => { ... }) * ``` */export type FilterQuery = ComputeFilterQueryList;
// === Infer the present/absent properties on a context object based on a query// Note: L3 filters are not represented in types
/** * Any kind of value that appears in the Telegram Bot API. When intersected with * an optional field, it effectively removes `| undefined`. */type NotUndefined = string | number | boolean | object;
/** * Given a FilterQuery, returns an object that, when intersected with an Update, * marks those properties as required that are guaranteed to exist. */type RunQuery<Q extends string> = L1Discriminator<Q, L1Parts<Q>>;
// gets all L1 query snippetstype L1Parts<Q extends string> = Q extends `${infer L1}:${string}` ? L1 : Q;// gets all L2 query snippets for the given L1 part, or `never`type L2Parts< Q extends string, L1 extends string,> = Q extends `${L1}:${infer L2}:${string}` ? L2 : Q extends `${L1}:${infer L2}` ? L2 : never;
// build up all combinations of all L1 fieldstype L1Discriminator<Q extends string, L1 extends string> = Combine< L1Fragment<Q, L1>, L1>;// maps each L1 part of the filter query to an objecttype L1Fragment<Q extends string, L1 extends string> = L1 extends unknown ? Record<L1, L2Discriminator<L1, L2Parts<Q, L1>>> : never;
// build up all combinations of all L2 fieldstype L2Discriminator<L1 extends string, L2 extends string> = [L2] extends [never] ? L2ShallowFragment<L1> // short-circuit L1 queries (L2 is never), only add twins : Combine<L2Fragment<L1, L2>, L2>;// maps each L2 part of the filter query to an object and handles siblingstype L2Fragment<L1 extends string, L2 extends string> = L2 extends unknown ? Record<L2 | AddTwins<L1, L2>, NotUndefined> : never;// does the same as L1Fragment but without combining L2 propertiestype L2ShallowFragment<L1 extends string> = Record< AddTwins<L1, never>, NotUndefined>;
// define additional fields on U with value `undefined`type Combine<U, K extends string> = U extends unknown ? U & Partial<Record<Exclude<K, keyof U>, undefined>> : never;
/** * This type infers which properties will be present on the given context object * provided it matches the given filter query. If the filter query is a union * type, the produced context object will be a union of possible combinations, * hence allowing you to narrow down manually which of the properties are * present. * * In some sense, this type computes `matchFilter` on the type level. */export type Filter<C extends Context, Q extends FilterQuery> = PerformQuery< C, RunQuery<ExpandShortcuts<Q>>>;// same as Filter but stop before intersecting with Contextexport type FilterCore<Q extends FilterQuery> = PerformQueryCore< RunQuery<ExpandShortcuts<Q>>>;
// apply a query result by intersecting it with Update, and then injecting into Ctype PerformQuery<C extends Context, U extends object> = U extends unknown ? FilteredContext<C, Update & U> : never;type PerformQueryCore<U extends object> = U extends unknown ? FilteredContextCore<Update & U> : never;
// set the given update into a given context object, and adjust the aliasestype FilteredContext<C extends Context, U extends Update> = & C & FilteredContextCore<U>;
// generate a structure with all aliases for a narrowed updatetype FilteredContextCore<U extends Update> = & Record<"update", U> & Shortcuts<U>;
// helper type to infer shortcuts on context object based on present properties,// must be in sync with shortcut impl!interface Shortcuts<U extends Update> { message: [U["message"]] extends [object] ? U["message"] : undefined; edited_message: [U["edited_message"]] extends [object] ? U["edited_message"] : undefined; channelPost: [U["channel_post"]] extends [object] ? U["channel_post"] : undefined; editedChannelPost: [U["edited_channel_post"]] extends [object] ? U["edited_channel_post"] : undefined; businessConnection: [U["business_connection"]] extends [object] ? U["business_connection"] : undefined; businessMessage: [U["business_message"]] extends [object] ? U["business_message"] : undefined; editedBusinessMessage: [U["edited_business_message"]] extends [object] ? U["edited_business_message"] : undefined; deletedBusinessMessages: [U["deleted_business_messages"]] extends [object] ? U["deleted_business_messages"] : undefined; messageReaction: [U["message_reaction"]] extends [object] ? U["message_reaction"] : undefined; messageReactionCount: [U["message_reaction_count"]] extends [object] ? U["message_reaction_count"] : undefined; inlineQuery: [U["inline_query"]] extends [object] ? U["inline_query"] : undefined; chosenInlineResult: [U["chosen_inline_result"]] extends [object] ? U["chosen_inline_result"] : undefined; callbackQuery: [U["callback_query"]] extends [object] ? U["callback_query"] : undefined; shippingQuery: [U["shipping_query"]] extends [object] ? U["shipping_query"] : undefined; preCheckoutQuery: [U["pre_checkout_query"]] extends [object] ? U["pre_checkout_query"] : undefined; poll: [U["poll"]] extends [object] ? U["poll"] : undefined; pollAnswer: [U["poll_answer"]] extends [object] ? U["poll_answer"] : undefined; myChatMember: [U["my_chat_member"]] extends [object] ? U["my_chat_member"] : undefined; chatMember: [U["chat_member"]] extends [object] ? U["chat_member"] : undefined; chatJoinRequest: [U["chat_join_request"]] extends [object] ? U["chat_join_request"] : undefined; chatBoost: [U["chat_boost"]] extends [object] ? U["chat_boost"] : undefined; removedChatBoost: [U["removed_chat_boost"]] extends [object] ? U["removed_chat_boost"] : undefined; msg: [U["message"]] extends [object] ? U["message"] : [U["edited_message"]] extends [object] ? U["edited_message"] : [U["channel_post"]] extends [object] ? U["channel_post"] : [U["edited_channel_post"]] extends [object] ? U["edited_channel_post"] : [U["business_message"]] extends [object] ? U["business_message"] : [U["edited_business_message"]] extends [object] ? U["edited_business_message"] : [U["callback_query"]] extends [object] ? U["callback_query"]["message"] : undefined; chat: [Shortcuts<U>["msg"]] extends [object] ? Shortcuts<U>["msg"]["chat"] : [U["deleted_business_messages"]] extends [object] ? U["deleted_business_messages"]["chat"] : [U["message_reaction"]] extends [object] ? U["message_reaction"]["chat"] : [U["message_reaction_count"]] extends [object] ? U["message_reaction_count"]["chat"] : [U["my_chat_member"]] extends [object] ? U["my_chat_member"]["chat"] : [U["chat_member"]] extends [object] ? U["chat_member"]["chat"] : [U["chat_join_request"]] extends [object] ? U["chat_join_request"]["chat"] : [U["chat_boost"]] extends [object] ? U["chat_boost"]["chat"] : [U["removed_chat_boost"]] extends [object] ? U["removed_chat_boost"]["chat"] : undefined; senderChat: [Shortcuts<U>["msg"]] extends [object] ? Shortcuts<U>["msg"]["sender_chat"] : undefined; from: [U["business_connection"]] extends [object] ? U["business_connection"]["user"] : [U["message_reaction"]] extends [object] ? U["message_reaction"]["user"] : [U["chat_boost"]] extends [object] ? U["chat_boost"]["boost"]["source"]["user"] : [U["removed_chat_boost"]] extends [object] ? U["removed_chat_boost"]["source"]["user"] : [U["callback_query"]] extends [object] ? U["callback_query"]["from"] : [Shortcuts<U>["msg"]] extends [object] ? Shortcuts<U>["msg"]["from"] : [U["inline_query"]] extends [object] ? U["inline_query"]["from"] : [U["chosen_inline_result"]] extends [object] ? U["chosen_inline_result"]["from"] : [U["shipping_query"]] extends [object] ? U["shipping_query"]["from"] : [U["pre_checkout_query"]] extends [object] ? U["pre_checkout_query"]["from"] : [U["my_chat_member"]] extends [object] ? U["my_chat_member"]["from"] : [U["chat_member"]] extends [object] ? U["chat_member"]["from"] : [U["chat_join_request"]] extends [object] ? U["chat_join_request"]["from"] : undefined; msgId: [Shortcuts<U>["msg"]] extends [object] ? number : U["message_reaction"] extends [object] ? number : U["message_reaction_count"] extends [object] ? number : undefined; // inlineMessageId: disregarded here because always optional on both types businessConnectionId: [Shortcuts<U>["msg"]] extends [object] ? string | undefined : [U["business_connection"]] extends [object] ? [U["business_connection"]["id"]] : [U["deleted_business_messages"]] extends [object] ? [U["deleted_business_messages"]["business_connection_id"]] : undefined;}
// === Define some helpers for handling shortcuts, e.g. in 'edit:photo'const L1_SHORTCUTS = { "": ["message", "channel_post"], msg: ["message", "channel_post"], edit: ["edited_message", "edited_channel_post"],} as const;const L2_SHORTCUTS = { "": ["entities", "caption_entities"], media: ["photo", "video"], file: [ "photo", "animation", "audio", "document", "video", "video_note", "voice", "sticker", ],} as const;type L1Shortcuts = KeyOf<typeof L1_SHORTCUTS>;type L2Shortcuts = KeyOf<typeof L2_SHORTCUTS>;
type ExpandShortcuts<Q extends string> = Q extends `${infer L1}:${infer L2}:${infer L3}` ? `${ExpandL1<L1>}:${ExpandL2<L2>}:${L3}` : Q extends `${infer L1}:${infer L2}` ? `${ExpandL1<L1>}:${ExpandL2<L2>}` : ExpandL1<Q>;type ExpandL1<S extends string> = S extends L1Shortcuts ? typeof L1_SHORTCUTS[S][number] : S;type ExpandL2<S extends string> = S extends L2Shortcuts ? typeof L2_SHORTCUTS[S][number] : S;
// === Define some helpers for when one property implies the existence of others
// merges twins based on L1 with those based on L1 and L2type AddTwins<L1 extends string, L2 extends string> = | TwinsFromL1<L1, L2> | TwinsFromL2<L1, L2>;
// yields twins based on a given L1 propertytype TwinsFromL1<L1 extends string, L2 extends string> = L1 extends KeyOf<L1Equivalents> ? L1Equivalents[L1] : L2;type L1Equivalents = { message: "from"; edited_message: "from" | "edit_date"; channel_post: "sender_chat"; edited_channel_post: "sender_chat" | "edit_date"; business_message: "from"; edited_business_message: "from" | "edit_date";};
// yields twins based on given L1 and L2 propertiestype TwinsFromL2<L1 extends string, L2 extends string> = L1 extends KeyOf<L2Equivalents> ? L2 extends KeyOf<L2Equivalents[L1]> ? L2Equivalents[L1][L2] : L2 : L2;type L2Equivalents = { message: MessageEquivalents; edited_message: MessageEquivalents; channel_post: MessageEquivalents; edited_channel_post: MessageEquivalents; business_message: MessageEquivalents; edited_business_message: MessageEquivalents;};type MessageEquivalents = { animation: "document"; entities: "text"; caption: CaptionMessages; caption_entities: CaptionMessages;};type CaptionMessages = | "animation" | "audio" | "document" | "photo" | "video" | "voice";
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