Add anti-raid levels to automod. Large refactor of spam detection. Add member_join and member_join_spam triggers.

Anti-raid levels don't by themselves do anything, but they can be
used in overrides to activate specific automod items.

Spam detection should now be more reliable and also combine further
spam messages after the initial detection into the archive.

Messages deleted by automod no longer create the normal deletion log
entry. Instead, the AUTOMOD_ACTION log entry contains the deleted
message or an archive if there are multiple (i.e. spam).

backend/src/data/DefaultLogMessages.json

@@ -61,5 +61,8 @@
   "POSTED_SCHEDULED_MESSAGE": "\uD83D\uDCE8 Posted scheduled message (`{messageId}`) to {channelMention(channel)} as scheduled by {userMention(author)}",
 
   "BOT_ALERT": "⚠ {tmplEval(body)}",
-  "AUTOMOD_ACTION": "\uD83E\uDD16 Automod rule **{rule}** triggered by {userMention(user)}\n{matchSummary}\nActions taken: **{actionsTaken}**"
+  "AUTOMOD_ACTION": "\uD83E\uDD16 Automod rule **{rule}** triggered by {userMention(users)}\n{matchSummary}\nActions taken: **{actionsTaken}**",
+
+  "SET_ANTIRAID_USER": "⚔ {userMention(user)} set anti-raid to **{level}**",
+  "SET_ANTIRAID_AUTO": "⚔ Anti-raid automatically set to **{level}**"
 }

backend/src/data/GuildAntiraidLevels.ts

@@ -0,0 +1,42 @@
+import { BaseGuildRepository } from "./BaseGuildRepository";
+import { getRepository, Repository } from "typeorm";
+import { AntiraidLevel } from "./entities/AntiraidLevel";
+
+export class GuildAntiraidLevels extends BaseGuildRepository {
+  protected antiraidLevels: Repository<AntiraidLevel>;
+
+  constructor(guildId: string) {
+    super(guildId);
+    this.antiraidLevels = getRepository(AntiraidLevel);
+  }
+
+  async get() {
+    const row = await this.antiraidLevels.findOne({
+      where: {
+        guild_id: this.guildId,
+      },
+    });
+
+    return row?.level ?? null;
+  }
+
+  async set(level: string | null) {
+    if (level === null) {
+      await this.antiraidLevels.delete({
+        guild_id: this.guildId,
+      });
+    } else {
+      // Upsert: https://stackoverflow.com/a/47064558/316944
+      await this.antiraidLevels
+        .createQueryBuilder()
+        .insert()
+        .values({
+          guild_id: this.guildId,
+          level,
+        })
+        .onConflict('("guild_id") DO UPDATE SET "guild_id" = :guildId')
+        .setParameter("guildId", this.guildId)
+        .execute();
+    }
+  }
+}

backend/src/data/GuildArchives.ts

@@ -71,10 +71,7 @@ export class GuildArchives extends BaseGuildRepository {
     return result.identifiers[0].id;
   }
 
-  async createFromSavedMessages(savedMessages: SavedMessage[], guild: Guild, expiresAt = null) {
-    if (expiresAt == null) expiresAt = moment().add(DEFAULT_EXPIRY_DAYS, "days");
-
-    const headerStr = await renderTemplate(MESSAGE_ARCHIVE_HEADER_FORMAT, { guild });
+  protected async renderLinesFromSavedMessages(savedMessages: SavedMessage[], guild: Guild) {
     const msgLines = [];
     for (const msg of savedMessages) {
       const channel = guild.channels.get(msg.channel_id);
@@ -89,11 +86,29 @@ export class GuildArchives extends BaseGuildRepository {
       });
       msgLines.push(line);
     }
+    return msgLines;
+  }
+
+  async createFromSavedMessages(savedMessages: SavedMessage[], guild: Guild, expiresAt = null) {
+    if (expiresAt == null) expiresAt = moment().add(DEFAULT_EXPIRY_DAYS, "days");
+
+    const headerStr = await renderTemplate(MESSAGE_ARCHIVE_HEADER_FORMAT, { guild });
+    const msgLines = await this.renderLinesFromSavedMessages(savedMessages, guild);
     const messagesStr = msgLines.join("\n");
 
     return this.create([headerStr, messagesStr].join("\n\n"), expiresAt);
   }
 
+  async addSavedMessagesToArchive(archiveId: string, savedMessages: SavedMessage[], guild: Guild) {
+    const msgLines = await this.renderLinesFromSavedMessages(savedMessages, guild);
+    const messagesStr = msgLines.join("\n");
+
+    const archive = await this.find(archiveId);
+    archive.body += "\n" + messagesStr;
+
+    await this.archives.update({ id: archiveId }, { body: archive.body });
+  }
+
   getUrl(baseUrl, archiveId) {
     return baseUrl ? `${baseUrl}/archives/${archiveId}` : `Archive ID: ${archiveId}`;
   }

backend/src/data/LogType.ts

@@ -64,4 +64,9 @@ export enum LogType {
   REPEATED_MESSAGE,
 
   MESSAGE_DELETE_AUTO,
+
+  SET_ANTIRAID_USER,
+  SET_ANTIRAID_AUTO,
+
+  AUTOMOD_SPAM_NEW,
 }

backend/src/data/entities/AntiraidLevel.ts

@@ -0,0 +1,11 @@
+import { Entity, Column, PrimaryColumn } from "typeorm";
+
+@Entity("antiraid_levels")
+export class AntiraidLevel {
+  @Column()
+  @PrimaryColumn()
+  guild_id: string;
+
+  @Column()
+  level: string;
+}