647 lines
27 KiB
TypeScript
647 lines
27 KiB
TypeScript
import {
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Collection,
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Client,
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Message,
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TextChannel,
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DMChannel,
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NewsChannel,
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Guild,
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User,
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GuildMember,
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GuildChannel
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} from "discord.js";
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import {SingleMessageOptions} from "./libd";
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import {hasPermission, getPermissionLevel, getPermissionName} from "./permissions";
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import {getPrefix} from "./interface";
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import {parseVars, requireAllCasesHandledFor} from "../lib";
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/**
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* ===[ Command Types ]===
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* SUBCOMMAND - Any specifically-defined keywords / string literals.
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* CHANNEL - <#...>
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* ROLE - <@&...>
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* EMOTE - <::ID> (The previous two values, animated and emote name respectively, do not matter at all for finding the emote.)
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* MESSAGE - Available by using the built-in "Copy Message Link" or "Copy ID" buttons. https://discordapp.com/channels/<Guild ID>/<Channel ID>/<Message ID> or <Channel ID>-<Message ID> (automatically searches all guilds for the channel ID).
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* USER - <@...> and <@!...>
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* ID - Any number with 17-19 digits. Only used as a redirect to another subcommand type.
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* NUMBER - Any valid number via the Number() function, except for NaN and Infinity (because those can really mess with the program).
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* ANY - Generic argument case.
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* NONE - No subcommands exist.
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*/
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// RegEx patterns used for identifying/extracting each type from a string argument.
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const patterns = {
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channel: /^<#(\d{17,19})>$/,
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role: /^<@&(\d{17,19})>$/,
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emote: /^<a?:.*?:(\d{17,19})>$/,
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messageLink: /^https?:\/\/(?:ptb\.|canary\.)?discord(?:app)?\.com\/channels\/(?:\d{17,19}|@me)\/(\d{17,19})\/(\d{17,19})$/,
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messagePair: /^(\d{17,19})-(\d{17,19})$/,
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user: /^<@!?(\d{17,19})>$/,
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id: /^(\d{17,19})$/
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};
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// Maybe add a guild redirect... somehow?
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type ID = "channel" | "role" | "emote" | "message" | "user";
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// Callbacks don't work with discriminated unions:
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// - https://github.com/microsoft/TypeScript/issues/41759
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// - https://github.com/microsoft/TypeScript/issues/35769
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// Therefore, there won't by any type narrowing on channel or guild of CommandMenu until this is fixed.
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// Otherwise, you'd have to define channelType for every single subcommand, which would get very tedious.
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// Just use type assertions when you specify a channel type.
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export enum CHANNEL_TYPE {
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ANY,
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GUILD,
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DM
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}
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interface CommandMenu {
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readonly args: any[];
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readonly client: Client;
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readonly message: Message;
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readonly channel: TextChannel | DMChannel | NewsChannel;
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readonly guild: Guild | null;
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readonly author: User;
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// According to the documentation, a message can be part of a guild while also not having a
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// member object for the author. This will happen if the author of a message left the guild.
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readonly member: GuildMember | null;
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}
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interface CommandOptionsBase {
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readonly description?: string;
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readonly endpoint?: boolean;
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readonly usage?: string;
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readonly permission?: number;
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readonly nsfw?: boolean;
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readonly channelType?: CHANNEL_TYPE;
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readonly run?: (($: CommandMenu) => Promise<any>) | string;
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}
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interface CommandOptionsEndpoint {
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readonly endpoint: true;
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}
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// Prevents subcommands from being added by compile-time.
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// Also, contrary to what you might think, channel pings do still work in DM channels.
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// Role pings, maybe not, but it's not a big deal.
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interface CommandOptionsNonEndpoint {
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readonly endpoint?: false;
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readonly subcommands?: {[key: string]: NamedCommand};
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readonly channel?: Command;
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readonly role?: Command;
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readonly emote?: Command;
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readonly message?: Command;
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readonly user?: Command;
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readonly id?: ID;
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readonly number?: Command;
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readonly any?: Command;
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}
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type CommandOptions = CommandOptionsBase & (CommandOptionsEndpoint | CommandOptionsNonEndpoint);
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type NamedCommandOptions = CommandOptions & {aliases?: string[]};
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interface ExecuteCommandMetadata {
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readonly header: string;
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readonly args: string[];
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permission: number;
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nsfw: boolean;
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channelType: CHANNEL_TYPE;
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}
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interface CommandInfo {
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readonly type: "info";
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readonly command: Command;
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readonly subcommandInfo: Collection<string, Command>;
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readonly keyedSubcommandInfo: Collection<string, NamedCommand>;
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readonly permission: number;
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readonly nsfw: boolean;
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readonly channelType: CHANNEL_TYPE;
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readonly args: string[];
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}
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interface CommandInfoError {
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readonly type: "error";
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readonly message: string;
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}
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interface CommandInfoMetadata {
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permission: number;
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nsfw: boolean;
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channelType: CHANNEL_TYPE;
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args: string[];
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usage: string;
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readonly originalArgs: string[];
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}
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export const defaultMetadata = {
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permission: 0,
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nsfw: false,
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channelType: CHANNEL_TYPE.ANY
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};
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// Each Command instance represents a block that links other Command instances under it.
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export class Command {
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public readonly description: string;
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public readonly endpoint: boolean;
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public readonly usage: string;
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public readonly permission: number; // -1 (default) indicates to inherit, 0 is the lowest rank, 1 is second lowest rank, and so on.
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public readonly nsfw: boolean | null; // null (default) indicates to inherit
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public readonly channelType: CHANNEL_TYPE | null; // null (default) indicates to inherit
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// The execute and subcommand properties are restricted to the class because subcommand recursion could easily break when manually handled.
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// The class will handle checking for null fields.
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private run: (($: CommandMenu) => Promise<any>) | string;
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private readonly subcommands: Collection<string, NamedCommand>; // This is the final data structure you'll actually use to work with the commands the aliases point to.
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private channel: Command | null;
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private role: Command | null;
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private emote: Command | null;
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private message: Command | null;
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private user: Command | null;
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private id: Command | null;
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private idType: ID | null;
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private number: Command | null;
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private any: Command | null;
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constructor(options?: CommandOptions) {
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this.description = options?.description || "No description.";
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this.endpoint = !!options?.endpoint;
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this.usage = options?.usage ?? "";
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this.permission = options?.permission ?? -1;
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this.nsfw = options?.nsfw ?? null;
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this.channelType = options?.channelType ?? null;
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this.run = options?.run || "No action was set on this command!";
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this.subcommands = new Collection(); // Populate this collection after setting subcommands.
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this.channel = null;
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this.role = null;
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this.emote = null;
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this.message = null;
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this.user = null;
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this.id = null;
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this.idType = null;
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this.number = null;
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this.any = null;
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if (options && !options.endpoint) {
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if (options?.channel) this.channel = options.channel;
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if (options?.role) this.role = options.role;
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if (options?.emote) this.emote = options.emote;
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if (options?.message) this.message = options.message;
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if (options?.user) this.user = options.user;
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if (options?.number) this.number = options.number;
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if (options?.any) this.any = options.any;
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if (options?.id) this.idType = options.id;
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if (options?.id) {
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switch (options.id) {
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case "channel":
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this.id = this.channel;
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break;
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case "role":
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this.id = this.role;
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break;
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case "emote":
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this.id = this.emote;
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break;
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case "message":
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this.id = this.message;
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break;
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case "user":
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this.id = this.user;
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break;
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default:
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requireAllCasesHandledFor(options.id);
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}
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}
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if (options?.subcommands) {
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const baseSubcommands = Object.keys(options.subcommands);
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// Loop once to set the base subcommands.
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for (const name in options.subcommands) this.subcommands.set(name, options.subcommands[name]);
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// Then loop again to make aliases point to the base subcommands and warn if something's not right.
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// This shouldn't be a problem because I'm hoping that JS stores these as references that point to the same object.
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for (const name in options.subcommands) {
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const subcmd = options.subcommands[name];
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subcmd.name = name;
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const aliases = subcmd.aliases;
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for (const alias of aliases) {
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if (baseSubcommands.includes(alias))
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console.warn(
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`"${alias}" in subcommand "${name}" was attempted to be declared as an alias but it already exists in the base commands! (Look at the next "Loading Command" line to see which command is affected.)`
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);
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else if (this.subcommands.has(alias))
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console.warn(
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`Duplicate alias "${alias}" at subcommand "${name}"! (Look at the next "Loading Command" line to see which command is affected.)`
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);
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else this.subcommands.set(alias, subcmd);
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}
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}
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}
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}
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}
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// Go through the arguments provided and find the right subcommand, then execute with the given arguments.
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// Will return null if it successfully executes, SingleMessageOptions if there's an error (to let the user know what it is).
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//
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// Calls the resulting subcommand's execute method in order to make more modular code, basically pushing the chain of execution to the subcommand.
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// For example, a numeric subcommand would accept args of [4] then execute on it.
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public async execute(
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args: string[],
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menu: CommandMenu,
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metadata: ExecuteCommandMetadata
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): Promise<SingleMessageOptions | null> {
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// Update inherited properties if the current command specifies a property.
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// In case there are no initial arguments, these should go first so that it can register.
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if (this.permission !== -1) metadata.permission = this.permission;
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if (this.nsfw !== null) metadata.nsfw = this.nsfw;
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if (this.channelType !== null) metadata.channelType = this.channelType;
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// Take off the leftmost argument from the list.
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const param = args.shift();
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// If there are no arguments left, execute the current command. Otherwise, continue on.
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if (param === undefined) {
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// See if there is anything that'll prevent the user from executing the command.
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// 1. Does this command specify a required channel type? If so, does the channel type match?
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if (
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metadata.channelType === CHANNEL_TYPE.GUILD &&
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(!(menu.channel instanceof GuildChannel) || menu.guild === null || menu.member === null)
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) {
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return {content: "This command must be executed in a server."};
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} else if (
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metadata.channelType === CHANNEL_TYPE.DM &&
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(menu.channel.type !== "dm" || menu.guild !== null || menu.member !== null)
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) {
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return {content: "This command must be executed as a direct message."};
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}
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// 2. Is this an NSFW command where the channel prevents such use? (DM channels bypass this requirement.)
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if (metadata.nsfw && menu.channel.type !== "dm" && !menu.channel.nsfw) {
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return {content: "This command must be executed in either an NSFW channel or as a direct message."};
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}
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// 3. Does the user have permission to execute the command?
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if (!hasPermission(menu.author, menu.member, metadata.permission)) {
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const userPermLevel = getPermissionLevel(menu.author, menu.member);
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return {
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content: `You don't have access to this command! Your permission level is \`${getPermissionName(
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userPermLevel
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)}\` (${userPermLevel}), but this command requires a permission level of \`${getPermissionName(
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metadata.permission
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)}\` (${metadata.permission}).`
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};
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}
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// Then capture any potential errors.
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try {
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if (typeof this.run === "string") {
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await menu.channel.send(
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parseVars(
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this.run,
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{
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author: menu.author.toString(),
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prefix: getPrefix(menu.guild)
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},
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"???"
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)
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);
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} else {
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await this.run(menu);
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}
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return null;
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} catch (error) {
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const errorMessage = error.stack ?? error;
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console.error(`Command Error: ${metadata.header} (${metadata.args.join(", ")})\n${errorMessage}`);
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return {
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content: `There was an error while trying to execute that command!\`\`\`${errorMessage}\`\`\``
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};
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}
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}
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// If the current command is an endpoint but there are still some arguments left, don't continue.
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if (this.endpoint) return {content: "Too many arguments!"};
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// Resolve the value of the current command's argument (adding it to the resolved args),
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// then pass the thread of execution to whichever subcommand is valid (if any).
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const isMessageLink = patterns.messageLink.test(param);
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const isMessagePair = patterns.messagePair.test(param);
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if (this.subcommands.has(param)) {
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return this.subcommands.get(param)!.execute(args, menu, metadata);
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} else if (this.channel && patterns.channel.test(param)) {
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const id = patterns.channel.exec(param)![1];
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const channel = menu.client.channels.cache.get(id);
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// Users can only enter in this format for text channels, so this restricts it to that.
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if (channel instanceof TextChannel) {
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menu.args.push(channel);
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return this.channel.execute(args, menu, metadata);
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} else {
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return {
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content: `\`${id}\` is not a valid text channel!`
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};
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}
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} else if (this.role && patterns.role.test(param)) {
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const id = patterns.role.exec(param)![1];
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if (!menu.guild) {
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return {
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content: "You can't use role parameters in DM channels!"
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};
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}
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const role = menu.guild.roles.cache.get(id);
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if (role) {
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menu.args.push(role);
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return this.role.execute(args, menu, metadata);
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} else {
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return {
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content: `\`${id}\` is not a valid role in this server!`
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};
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}
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} else if (this.emote && patterns.emote.test(param)) {
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const id = patterns.emote.exec(param)![1];
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const emote = menu.client.emojis.cache.get(id);
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if (emote) {
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menu.args.push(emote);
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return this.emote.execute(args, menu, metadata);
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} else {
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return {
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content: `\`${id}\` isn't a valid emote!`
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};
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}
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} else if (this.message && (isMessageLink || isMessagePair)) {
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let channelID = "";
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let messageID = "";
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if (isMessageLink) {
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const result = patterns.messageLink.exec(param)!;
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channelID = result[1];
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messageID = result[2];
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} else if (isMessagePair) {
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const result = patterns.messagePair.exec(param)!;
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channelID = result[1];
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messageID = result[2];
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}
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const channel = menu.client.channels.cache.get(channelID);
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if (channel instanceof TextChannel || channel instanceof DMChannel) {
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try {
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menu.args.push(await channel.messages.fetch(messageID));
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return this.message.execute(args, menu, metadata);
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} catch {
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return {
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content: `\`${messageID}\` isn't a valid message of channel ${channel}!`
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};
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}
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} else {
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return {
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content: `\`${channelID}\` is not a valid text channel!`
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};
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}
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} else if (this.user && patterns.user.test(param)) {
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const id = patterns.user.exec(param)![1];
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try {
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menu.args.push(await menu.client.users.fetch(id));
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return this.user.execute(args, menu, metadata);
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} catch {
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return {
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content: `No user found by the ID \`${id}\`!`
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};
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}
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} else if (this.id && this.idType && patterns.id.test(param)) {
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const id = patterns.id.exec(param)![1];
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// Probably modularize the findXByY code in general in libd.
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// Because this part is pretty much a whole bunch of copy pastes.
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switch (this.idType) {
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case "channel":
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const channel = menu.client.channels.cache.get(id);
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// Users can only enter in this format for text channels, so this restricts it to that.
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if (channel instanceof TextChannel) {
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menu.args.push(channel);
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return this.id.execute(args, menu, metadata);
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} else {
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return {
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content: `\`${id}\` isn't a valid text channel!`
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};
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}
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case "role":
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if (!menu.guild) {
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return {
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content: "You can't use role parameters in DM channels!"
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};
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}
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const role = menu.guild.roles.cache.get(id);
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if (role) {
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menu.args.push(role);
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return this.id.execute(args, menu, metadata);
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} else {
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return {
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content: `\`${id}\` isn't a valid role in this server!`
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};
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}
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case "emote":
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const emote = menu.client.emojis.cache.get(id);
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if (emote) {
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menu.args.push(emote);
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return this.id.execute(args, menu, metadata);
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} else {
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return {
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content: `\`${id}\` isn't a valid emote!`
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};
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}
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case "message":
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try {
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menu.args.push(await menu.channel.messages.fetch(id));
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return this.id.execute(args, menu, metadata);
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} catch {
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return {
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content: `\`${id}\` isn't a valid message of channel ${menu.channel}!`
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};
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}
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case "user":
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try {
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menu.args.push(await menu.client.users.fetch(id));
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return this.id.execute(args, menu, metadata);
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} catch {
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return {
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content: `No user found by the ID \`${id}\`!`
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};
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}
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default:
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requireAllCasesHandledFor(this.idType);
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}
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} else if (this.number && !Number.isNaN(Number(param)) && param !== "Infinity" && param !== "-Infinity") {
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menu.args.push(Number(param));
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return this.number.execute(args, menu, metadata);
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} else if (this.any) {
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menu.args.push(param);
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return this.any.execute(args, menu, metadata);
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} else {
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// Continue adding on the rest of the arguments if there's no valid subcommand.
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menu.args.push(param);
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return this.execute(args, menu, metadata);
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}
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// Note: Do NOT add a return statement here. In case one of the other sections is missing
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// a return statement, there'll be a compile error to catch that.
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}
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|
// What this does is resolve the resulting subcommand as well as the inherited properties and the available subcommands.
|
|
public async resolveInfo(args: string[]): Promise<CommandInfo | CommandInfoError> {
|
|
return this.resolveInfoInternal(args, {...defaultMetadata, args: [], usage: "", originalArgs: [...args]});
|
|
}
|
|
|
|
private async resolveInfoInternal(
|
|
args: string[],
|
|
metadata: CommandInfoMetadata
|
|
): Promise<CommandInfo | CommandInfoError> {
|
|
// Update inherited properties if the current command specifies a property.
|
|
// In case there are no initial arguments, these should go first so that it can register.
|
|
if (this.permission !== -1) metadata.permission = this.permission;
|
|
if (this.nsfw !== null) metadata.nsfw = this.nsfw;
|
|
if (this.channelType !== null) metadata.channelType = this.channelType;
|
|
if (this.usage !== "") metadata.usage = this.usage;
|
|
|
|
// Take off the leftmost argument from the list.
|
|
const param = args.shift();
|
|
|
|
// If there are no arguments left, return the data or an error message.
|
|
if (param === undefined) {
|
|
const keyedSubcommandInfo = new Collection<string, NamedCommand>();
|
|
const subcommandInfo = new Collection<string, Command>();
|
|
|
|
// Get all the subcommands of the current command but without aliases.
|
|
for (const [tag, command] of this.subcommands.entries()) {
|
|
// Don't capture duplicates generated from aliases.
|
|
if (tag === command.name) {
|
|
keyedSubcommandInfo.set(tag, command);
|
|
}
|
|
}
|
|
|
|
// Then get all the generic subcommands.
|
|
if (this.channel) subcommandInfo.set("<channel>", this.channel);
|
|
if (this.role) subcommandInfo.set("<role>", this.role);
|
|
if (this.emote) subcommandInfo.set("<emote>", this.emote);
|
|
if (this.message) subcommandInfo.set("<message>", this.message);
|
|
if (this.user) subcommandInfo.set("<user>", this.user);
|
|
if (this.id) subcommandInfo.set(`<id = <${this.idType}>>`, this.id);
|
|
if (this.number) subcommandInfo.set("<number>", this.number);
|
|
if (this.any) subcommandInfo.set("<any>", this.any);
|
|
|
|
return {
|
|
type: "info",
|
|
command: this,
|
|
keyedSubcommandInfo,
|
|
subcommandInfo,
|
|
...metadata
|
|
};
|
|
}
|
|
|
|
const invalidSubcommandGenerator: () => CommandInfoError = () => ({
|
|
type: "error",
|
|
message: `No subcommand found by the argument list: \`${metadata.originalArgs.join(" ")}\``
|
|
});
|
|
|
|
// Then test if anything fits any hardcoded values, otherwise check if it's a valid keyed subcommand.
|
|
if (param === "<channel>") {
|
|
if (this.channel) {
|
|
metadata.args.push("<channel>");
|
|
return this.channel.resolveInfoInternal(args, metadata);
|
|
} else {
|
|
return invalidSubcommandGenerator();
|
|
}
|
|
} else if (param === "<role>") {
|
|
if (this.role) {
|
|
metadata.args.push("<role>");
|
|
return this.role.resolveInfoInternal(args, metadata);
|
|
} else {
|
|
return invalidSubcommandGenerator();
|
|
}
|
|
} else if (param === "<emote>") {
|
|
if (this.emote) {
|
|
metadata.args.push("<emote>");
|
|
return this.emote.resolveInfoInternal(args, metadata);
|
|
} else {
|
|
return invalidSubcommandGenerator();
|
|
}
|
|
} else if (param === "<message>") {
|
|
if (this.message) {
|
|
metadata.args.push("<message>");
|
|
return this.message.resolveInfoInternal(args, metadata);
|
|
} else {
|
|
return invalidSubcommandGenerator();
|
|
}
|
|
} else if (param === "<user>") {
|
|
if (this.user) {
|
|
metadata.args.push("<user>");
|
|
return this.user.resolveInfoInternal(args, metadata);
|
|
} else {
|
|
return invalidSubcommandGenerator();
|
|
}
|
|
} else if (param === "<id>") {
|
|
if (this.id) {
|
|
metadata.args.push(`<id = <${this.idType}>>`);
|
|
return this.id.resolveInfoInternal(args, metadata);
|
|
} else {
|
|
return invalidSubcommandGenerator();
|
|
}
|
|
} else if (param === "<number>") {
|
|
if (this.number) {
|
|
metadata.args.push("<number>");
|
|
return this.number.resolveInfoInternal(args, metadata);
|
|
} else {
|
|
return invalidSubcommandGenerator();
|
|
}
|
|
} else if (param === "<any>") {
|
|
if (this.any) {
|
|
metadata.args.push("<any>");
|
|
return this.any.resolveInfoInternal(args, metadata);
|
|
} else {
|
|
return invalidSubcommandGenerator();
|
|
}
|
|
} else if (this.subcommands?.has(param)) {
|
|
metadata.args.push(param);
|
|
return this.subcommands.get(param)!.resolveInfoInternal(args, metadata);
|
|
} else {
|
|
return invalidSubcommandGenerator();
|
|
}
|
|
}
|
|
}
|
|
|
|
export class NamedCommand extends Command {
|
|
public readonly aliases: string[]; // This is to keep the array intact for parent Command instances to use. It'll also be used when loading top-level aliases.
|
|
private originalCommandName: string | null; // If the command is an alias, what's the original name?
|
|
|
|
constructor(options?: NamedCommandOptions) {
|
|
super(options);
|
|
this.aliases = options?.aliases || [];
|
|
this.originalCommandName = null;
|
|
}
|
|
|
|
public get name(): string {
|
|
if (this.originalCommandName === null) throw new Error("originalCommandName must be set before accessing it!");
|
|
else return this.originalCommandName;
|
|
}
|
|
|
|
public set name(value: string) {
|
|
if (this.originalCommandName !== null)
|
|
throw new Error(`originalCommandName cannot be set twice! Attempted to set the value to "${value}".`);
|
|
else this.originalCommandName = value;
|
|
}
|
|
}
|