diff --git a/util/src/services/ChannelService.ts b/util/src/services/ChannelService.ts
new file mode 100644
index 00000000..319475b6
--- /dev/null
+++ b/util/src/services/ChannelService.ts
@@ -0,0 +1,89 @@
+import { Channel, ChannelType, PublicUserProjection, Recipient, User } from "../entities";
+import { HTTPError } from "lambert-server";
+import { emitEvent, trimSpecial } from "../util";
+import { DmChannelDTO } from "../dtos";
+import { ChannelRecipientRemoveEvent } from "../interfaces";
+
+export function checker(arr: any[], target: any[]) {
+ return target.every(v => arr.includes(v));
+}
+
+export class ChannelService {
+ public static async createDMChannel(recipients: string[], creator_user_id: string, name?: string) {
+ recipients = recipients.unique().filter((x) => x !== creator_user_id);
+ const otherRecipientsUsers = await User.find({ where: recipients.map((x) => ({ id: x })) });
+
+ // TODO: check config for max number of recipients
+ if (otherRecipientsUsers.length !== recipients.length) {
+ throw new HTTPError("Recipient/s not found");
+ }
+
+ const type = recipients.length === 1 ? ChannelType.DM : ChannelType.GROUP_DM;
+
+ let channel = null;
+
+ const channelRecipients = [...recipients, creator_user_id]
+
+ const userRecipients = await Recipient.find({ where: { user_id: creator_user_id }, relations: ["channel", "channel.recipients"] })
+
+ for (let ur of userRecipients) {
+ let re = ur.channel.recipients!.map(r => r.user_id)
+ if (re.length === channelRecipients.length) {
+ if (checker(re, channelRecipients)) {
+ if (channel == null) {
+ channel = ur.channel
+ await ur.assign({ closed: false }).save()
+ }
+ }
+ }
+ }
+
+ if (channel == null) {
+ name = trimSpecial(name);
+
+ channel = await new Channel({
+ name,
+ type,
+ owner_id: (type === ChannelType.DM ? undefined : creator_user_id),
+ created_at: new Date(),
+ last_message_id: null,
+ recipients: channelRecipients.map((x) => new Recipient({ user_id: x, closed: !(type === ChannelType.GROUP_DM || x === creator_user_id) })),
+ }).save();
+ }
+
+
+ const channel_dto = await DmChannelDTO.from(channel)
+
+ if (type === ChannelType.GROUP_DM) {
+
+ for (let recipient of channel.recipients!) {
+ await emitEvent({
+ event: "CHANNEL_CREATE",
+ data: channel_dto.excludedRecipients([recipient.user_id]),
+ user_id: recipient.user_id
+ })
+ }
+ } else {
+ await emitEvent({ event: "CHANNEL_CREATE", data: channel_dto, user_id: creator_user_id });
+ }
+
+ return channel_dto.excludedRecipients([creator_user_id])
+ }
+
+ public static async removeRecipientFromChannel(channel: Channel, user_id: string) {
+ await Recipient.delete({ channel_id: channel.id, user_id: user_id })
+
+ await emitEvent({
+ event: "CHANNEL_DELETE",
+ data: await DmChannelDTO.from(channel, [user_id]),
+ user_id: user_id
+ });
+
+ await emitEvent({
+ event: "CHANNEL_RECIPIENT_REMOVE", data: {
+ channel_id: channel.id,
+ user: await User.findOneOrFail({ where: { id: user_id }, select: PublicUserProjection })
+ }, channel_id: channel.id
+ } as ChannelRecipientRemoveEvent);
+ }
+}
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