1 files changed, 184 insertions, 0 deletions
diff --git a/src/lib/common/Moderation.ts b/src/lib/common/Moderation.ts
new file mode 100644
index 0000000..29d66fa
--- /dev/null
+++ b/src/lib/common/Moderation.ts
@@ -0,0 +1,184 @@
+import { Snowflake } from 'discord-api-types';
+import {
+	ActivePunishment,
+	ActivePunishmentType,
+	BushGuildMember,
+	BushGuildMemberResolvable,
+	BushGuildResolvable,
+	Guild,
+	ModLog,
+	ModLogType
+} from '..';
+
+export class Moderation {
+	/**
+	 * Checks if a moderator can perform a moderation action on another user.
+	 * @param moderator - The person trying to perform the action.
+	 * @param victim - The person getting punished.
+	 * @param type - The type of punishment - used to format the response.
+	 * @param checkModerator - Whether or not to check if the victim is a moderator.
+	 */
+	public static async permissionCheck(
+		moderator: BushGuildMember,
+		victim: BushGuildMember,
+		type: 'mute' | 'unmute' | 'warn' | 'kick' | 'ban' | 'unban' | 'add a punishment role to' | 'remove a punishment role from',
+		checkModerator = true,
+		force = false
+	): Promise<true | string> {
+		if (force) return true;
+
+		// If the victim is not in the guild anymore it will be undefined
+		if ((!victim || !victim.guild) && !['ban', 'unban'].includes(type)) return true;
+
+		if (moderator.guild.id !== victim.guild.id) {
+			throw new Error('moderator and victim not in same guild');
+		}
+
+		const isOwner = moderator.guild.ownerId === moderator.id;
+		if (moderator.id === victim.id && !type.startsWith('un')) {
+			return `${util.emojis.error} You cannot ${type} yourself.`;
+		}
+		if (
+			moderator.roles.highest.position <= victim.roles.highest.position &&
+			!isOwner &&
+			!(type.startsWith('un') && moderator.id === victim.id)
+		) {
+			return `${util.emojis.error} You cannot ${type} **${victim.user.tag}** because they have higher or equal role hierarchy as you do.`;
+		}
+		if (
+			victim.roles.highest.position >= victim.guild.me!.roles.highest.position &&
+			!(type.startsWith('un') && moderator.id === victim.id)
+		) {
+			return `${util.emojis.error} You cannot ${type} **${victim.user.tag}** because they have higher or equal role hierarchy as I do.`;
+		}
+		if (checkModerator && victim.permissions.has('MANAGE_MESSAGES') && !(type.startsWith('un') && moderator.id === victim.id)) {
+			if (await moderator.guild.hasFeature('modsCanPunishMods')) {
+				return true;
+			} else {
+				return `${util.emojis.error} You cannot ${type} **${victim.user.tag}** because they are a moderator.`;
+			}
+		}
+		return true;
+	}
+
+	public static async createModLogEntry(
+		options: {
+			type: ModLogType;
+			user: BushGuildMemberResolvable;
+			moderator: BushGuildMemberResolvable;
+			reason: string | undefined | null;
+			duration?: number;
+			guild: BushGuildResolvable;
+			pseudo?: boolean;
+			evidence?: string;
+		},
+		getCaseNumber = false
+	): Promise<{ log: ModLog | null; caseNum: number | null }> {
+		const user = (await util.resolveNonCachedUser(options.user))!.id;
+		const moderator = (await util.resolveNonCachedUser(options.moderator))!.id;
+		const guild = client.guilds.resolveId(options.guild)!;
+		// eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing
+		const duration = options.duration || undefined;
+
+		// If guild does not exist create it so the modlog can reference a guild.
+		await Guild.findOrCreate({
+			where: {
+				id: guild
+			},
+			defaults: {
+				id: guild
+			}
+		});
+
+		const modLogEntry = ModLog.build({
+			type: options.type,
+			user,
+			moderator,
+			reason: options.reason,
+			duration: duration,
+			guild,
+			pseudo: options.pseudo ?? false,
+			evidence: options.evidence
+		});
+		const saveResult: ModLog | null = await modLogEntry.save().catch(async (e) => {
+			await util.handleError('createModLogEntry', e);
+			return null;
+		});
+
+		if (!getCaseNumber) return { log: saveResult, caseNum: null };
+
+		const caseNum = (await ModLog.findAll({ where: { type: options.type, user: user, guild: guild, hidden: 'false' } }))
+			?.length;
+		return { log: saveResult, caseNum };
+	}
+
+	public static async createPunishmentEntry(options: {
+		type: 'mute' | 'ban' | 'role' | 'block';
+		user: BushGuildMemberResolvable;
+		duration: number | undefined;
+		guild: BushGuildResolvable;
+		modlog: string;
+		extraInfo?: Snowflake;
+	}): Promise<ActivePunishment | null> {
+		const expires = options.duration ? new Date(+new Date() + options.duration ?? 0) : undefined;
+		const user = (await util.resolveNonCachedUser(options.user))!.id;
+		const guild = client.guilds.resolveId(options.guild)!;
+		const type = this.findTypeEnum(options.type)!;
+
+		const entry = ActivePunishment.build(
+			options.extraInfo
+				? { user, type, guild, expires, modlog: options.modlog, extraInfo: options.extraInfo }
+				: { user, type, guild, expires, modlog: options.modlog }
+		);
+		return await entry.save().catch(async (e) => {
+			await util.handleError('createPunishmentEntry', e);
+			return null;
+		});
+	}
+
+	public static async removePunishmentEntry(options: {
+		type: 'mute' | 'ban' | 'role' | 'block';
+		user: BushGuildMemberResolvable;
+		guild: BushGuildResolvable;
+		extraInfo?: Snowflake;
+	}): Promise<boolean> {
+		const user = await util.resolveNonCachedUser(options.user);
+		const guild = client.guilds.resolveId(options.guild);
+		const type = this.findTypeEnum(options.type);
+
+		if (!user || !guild) return false;
+
+		let success = true;
+
+		const entries = await ActivePunishment.findAll({
+			// finding all cases of a certain type incase there were duplicates or something
+			where: options.extraInfo
+				? { user: user.id, guild: guild, type, extraInfo: options.extraInfo }
+				: { user: user.id, guild: guild, type }
+		}).catch(async (e) => {
+			await util.handleError('removePunishmentEntry', e);
+			success = false;
+		});
+		if (entries) {
+			const promises = entries.map(async (entry) =>
+				entry.destroy().catch(async (e) => {
+					await util.handleError('removePunishmentEntry', e);
+					success = false;
+				})
+			);
+
+			await Promise.all(promises);
+		}
+		return success;
+	}
+
+	private static findTypeEnum(type: 'mute' | 'ban' | 'role' | 'block') {
+		const typeMap = {
+			['mute']: ActivePunishmentType.MUTE,
+			['ban']: ActivePunishmentType.BAN,
+			['role']: ActivePunishmentType.ROLE,
+			['block']: ActivePunishmentType.BLOCK
+		};
+		return typeMap[type];
+	}
+}