feat: invite new user with email

backend/src/email/email.service.ts

@@ -73,6 +73,20 @@ export class EmailService {
     });
   }
 
+  async sendInviteEmail(recipientEmail: string, password: string) {
+    const loginUrl = `${this.config.get("APP_URL")}/auth/signIn`;
+
+    await this.getTransporter().sendMail({
+      from: `"Pingvin Share" <${this.config.get("SMTP_EMAIL")}>`,
+      to: recipientEmail,
+      subject: this.config.get("INVITE_EMAIL_SUBJECT"),
+      text: this.config
+        .get("INVITE_EMAIL_MESSAGE")
+        .replaceAll("{url}", loginUrl)
+        .replaceAll("{password}", password),
+    });
+  }
+
   async sendTestMail(recipientEmail: string) {
     try {
       await this.getTransporter().sendMail({

backend/src/user/dto/createUser.dto.ts

@@ -1,12 +1,15 @@
-import { Expose, plainToClass } from "class-transformer";
-import { Allow } from "class-validator";
+import { plainToClass } from "class-transformer";
+import { Allow, IsOptional, MinLength } from "class-validator";
 import { UserDTO } from "./user.dto";
 
 export class CreateUserDTO extends UserDTO {
-  @Expose()
   @Allow()
   isAdmin: boolean;
 
+  @MinLength(8)
+  @IsOptional()
+  password: string;
+
   from(partial: Partial<CreateUserDTO>) {
     return plainToClass(CreateUserDTO, partial, {
       excludeExtraneousValues: true,

backend/src/user/user.module.ts

@@ -1,8 +1,10 @@
 import { Module } from "@nestjs/common";
+import { EmailModule } from "src/email/email.module";
 import { UserController } from "./user.controller";
 import { UserSevice } from "./user.service";
 
 @Module({
+  imports:[EmailModule],
   providers: [UserSevice],
   controllers: [UserController],
 })

backend/src/user/user.service.ts

@@ -1,13 +1,17 @@
 import { BadRequestException, Injectable } from "@nestjs/common";
 import { PrismaClientKnownRequestError } from "@prisma/client/runtime";
 import * as argon from "argon2";
+import { EmailService } from "src/email/email.service";
 import { PrismaService } from "src/prisma/prisma.service";
 import { CreateUserDTO } from "./dto/createUser.dto";
 import { UpdateUserDto } from "./dto/updateUser.dto";
 
 @Injectable()
 export class UserSevice {
-  constructor(private prisma: PrismaService) {}
+  constructor(
+    private prisma: PrismaService,
+    private emailService: EmailService
+  ) {}
 
   async list() {
     return await this.prisma.user.findMany();
@@ -18,7 +22,17 @@ export class UserSevice {
   }
 
   async create(dto: CreateUserDTO) {
-    const hash = await argon.hash(dto.password);
+    let hash: string;
+
+    // The password can be undefined if the user is invited by an admin
+    if (!dto.password) {
+      const randomPassword = crypto.randomUUID();
+      hash = await argon.hash(randomPassword);
+      this.emailService.sendInviteEmail(dto.email, randomPassword);
+    } else {
+      hash = await argon.hash(dto.password);
+    }
+
     try {
       return await this.prisma.user.create({
         data: {