(BE) Add API for Workspace Invitation

backend/src/auth/auth.module.ts

@@ -14,7 +14,7 @@ import { JwtStrategy } from "./jwt.strategy";
 			useFactory: async (configService: ConfigService) => {
 				return {
 					signOptions: { expiresIn: "24h" },
-					secret: configService.get<string>("JWT_SECRET"),
+					secret: configService.get<string>("JWT_AUTH_SECRET"),
 				};
 			},
 			inject: [ConfigService],

backend/src/auth/jwt.strategy.ts

@@ -11,7 +11,7 @@ export class JwtStrategy extends PassportStrategy(PassportJwtStrategy) {
 		super({
 			jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
 			ignoreExpiration: false,
-			secretOrKey: configService.get<string>("JWT_SECRET"),
+			secretOrKey: configService.get<string>("JWT_AUTH_SECRET"),
 		});
 	}
 

backend/src/utils/constants/auth-role.ts

@@ -0,0 +1,4 @@
+export const WorkspaceRoleConstants = {
+	OWNER: "OWNER",
+	MEMBER: "MEMBER",
+};

backend/src/workspaces/dto/join-workspace.dto.ts

@@ -0,0 +1,6 @@
+import { ApiProperty } from "@nestjs/swagger";
+
+export class JoinWorkspaceDto {
+	@ApiProperty({ description: "Invitation token of workspace to join", type: String })
+	invitationToken: string;
+}

backend/src/workspaces/types/create-inviation-token-response.type.ts

@@ -0,0 +1,6 @@
+import { ApiProperty } from "@nestjs/swagger";
+
+export class CreateInvitationTokenResponse {
+	@ApiProperty({ type: String, description: "Token for invitation" })
+	invitationToken: string;
+}

backend/src/workspaces/types/inviation-token-payload.type.ts

@@ -0,0 +1,4 @@
+export class InvitationTokenPayload {
+	sub: string;
+	workspaceId: string;
+}

backend/src/workspaces/types/join-workspace-response.type.ts

@@ -0,0 +1,3 @@
+import { WorkspaceDomain } from "./workspace-domain.type";
+
+export class JoinWorkspaceResponse extends WorkspaceDomain {}

backend/src/workspaces/workspaces.controller.ts

@@ -10,22 +10,28 @@ import {
 	Req,
 } from "@nestjs/common";
 import { WorkspacesService } from "./workspaces.service";
-import { CreateWorkspaceDto } from "./dto/CreateWorkspace.dto";
+import { CreateWorkspaceDto } from "./dto/create-workspace.dto";
 import {
 	ApiBearerAuth,
 	ApiBody,
 	ApiCreatedResponse,
 	ApiFoundResponse,
 	ApiNotFoundResponse,
+	ApiOkResponse,
 	ApiOperation,
+	ApiParam,
 	ApiQuery,
 	ApiTags,
+	ApiUnauthorizedResponse,
 } from "@nestjs/swagger";
 import { AuthroizedRequest } from "src/utils/types/req.type";
 import { CreateWorkspaceResponse } from "./types/create-workspace-response.type";
 import { FindWorkspaceResponse } from "./types/find-workspace-response.type";
 import { HttpExceptionResponse } from "src/utils/types/http-exception-response.type";
 import { FindWorkspacesResponse } from "./types/find-workspaces-response.type";
+import { CreateInvitationTokenResponse } from "./types/create-inviation-token-response.type";
+import { JoinWorkspaceDto } from "./dto/join-workspace.dto";
+import { JoinWorkspaceResponse } from "./types/join-workspace-response.type";
 
 @ApiTags("Workspaces")
 @ApiBearerAuth()
@@ -90,4 +96,50 @@ export class WorkspacesController {
 	): Promise<FindWorkspacesResponse> {
 		return this.workspacesService.findMany(req.user.id, pageSize, cursor);
 	}
+
+	@Post(":workspace_id/invite-token")
+	@ApiOperation({
+		summary: "Create a Invitation Token",
+		description: "Create a inviation token using JWT.",
+	})
+	@ApiParam({
+		name: "workspace_id",
+		description: "ID of workspace to create invitation token",
+	})
+	@ApiOkResponse({
+		type: CreateInvitationTokenResponse,
+	})
+	@ApiNotFoundResponse({
+		type: HttpExceptionResponse,
+		description: "The workspace does not exist, or the user lacks the appropriate permissions.",
+	})
+	async createInvitationToken(
+		@Req() req: AuthroizedRequest,
+		@Param("workspace_id") workspaceId: string
+	): Promise<CreateInvitationTokenResponse> {
+		return this.workspacesService.createInvitationToken(req.user.id, workspaceId);
+	}
+
+	@Post("join")
+	@ApiOperation({
+		summary: "Join to the Workspace",
+		description: "Join to the workspace using JWT invitation token.",
+	})
+	@ApiOkResponse({
+		type: JoinWorkspaceResponse,
+	})
+	@ApiUnauthorizedResponse({
+		type: HttpExceptionResponse,
+		description: "Invitation token is invalid or expired.",
+	})
+	@ApiNotFoundResponse({
+		description: "The workspace does not exist.",
+		type: HttpExceptionResponse,
+	})
+	async join(
+		@Req() req: AuthroizedRequest,
+		@Body() joinWorkspaceDto: JoinWorkspaceDto
+	): Promise<JoinWorkspaceResponse> {
+		return this.workspacesService.join(req.user.id, joinWorkspaceDto.invitationToken);
+	}
 }

backend/src/workspaces/workspaces.module.ts

@@ -2,8 +2,21 @@ import { Module } from "@nestjs/common";
 import { WorkspacesController } from "./workspaces.controller";
 import { WorkspacesService } from "./workspaces.service";
 import { PrismaService } from "src/db/prisma.service";
+import { JwtModule } from "@nestjs/jwt";
+import { ConfigService } from "@nestjs/config";
 
 @Module({
+	imports: [
+		JwtModule.registerAsync({
+			useFactory: async (configService: ConfigService) => {
+				return {
+					signOptions: { expiresIn: "12h" },
+					secret: configService.get<string>("JWT_INVITATION_SECRET"),
+				};
+			},
+			inject: [ConfigService],
+		}),
+	],
 	controllers: [WorkspacesController],
 	providers: [WorkspacesService, PrismaService],
 })

backend/src/workspaces/workspaces.service.ts

@@ -1,11 +1,18 @@
-import { Injectable, NotFoundException } from "@nestjs/common";
+import { Injectable, NotFoundException, UnauthorizedException } from "@nestjs/common";
 import { Prisma, Workspace } from "@prisma/client";
 import { PrismaService } from "src/db/prisma.service";
 import { FindWorkspacesResponse } from "./types/find-workspaces-response.type";
+import { JwtService } from "@nestjs/jwt";
+import { CreateInvitationTokenResponse } from "./types/create-inviation-token-response.type";
+import { InvitationTokenPayload } from "./types/inviation-token-payload.type";
+import { WorkspaceRoleConstants } from "src/utils/constants/auth-role";
 
 @Injectable()
 export class WorkspacesService {
-	constructor(private prismaService: PrismaService) {}
+	constructor(
+		private prismaService: PrismaService,
+		private jwtService: JwtService
+	) {}
 
 	async create(userId: string, title: string): Promise<Workspace> {
 		const workspace = await this.prismaService.workspace.create({
@@ -18,7 +25,7 @@ export class WorkspacesService {
 			data: {
 				workspaceId: workspace.id,
 				userId,
-				role: "OWNER",
+				role: WorkspaceRoleConstants.OWNER,
 			},
 		});
 
@@ -77,4 +84,78 @@ export class WorkspacesService {
 			cursor: workspaceList.length > pageSize ? workspaceList[pageSize].id : null,
 		};
 	}
+
+	async createInvitationToken(
+		userId: string,
+		workspaceId: string
+	): Promise<CreateInvitationTokenResponse> {
+		try {
+			await this.prismaService.userWorkspace.findFirstOrThrow({
+				where: {
+					userId,
+					workspaceId,
+				},
+			});
+		} catch (e) {
+			throw new NotFoundException();
+		}
+
+		const invitationToken = this.jwtService.sign({
+			sub: userId,
+			workspaceId,
+		});
+
+		return {
+			invitationToken,
+		};
+	}
+
+	async join(userId: string, invitationToken: string) {
+		let workspaceId: string;
+
+		try {
+			const payload = this.jwtService.verify<InvitationTokenPayload>(invitationToken);
+
+			workspaceId = payload.workspaceId;
+		} catch (err) {
+			throw new UnauthorizedException("Invitation token is invalid or expired.");
+		}
+
+		try {
+			await this.prismaService.workspace.findUniqueOrThrow({
+				where: {
+					id: workspaceId,
+				},
+			});
+		} catch (e) {
+			throw new NotFoundException("The workspace is deleted.");
+		}
+
+		const userWorkspace = await this.prismaService.userWorkspace.findFirst({
+			where: {
+				userId,
+				workspaceId,
+			},
+			include: {
+				workspace: true,
+			},
+		});
+
+		if (!userWorkspace) {
+			return userWorkspace.workspace;
+		}
+
+		const newUserWorkspace = await this.prismaService.userWorkspace.create({
+			data: {
+				userId,
+				workspaceId,
+				role: WorkspaceRoleConstants.MEMBER,
+			},
+			include: {
+				workspace: true,
+			},
+		});
+
+		return newUserWorkspace.workspace;
+	}
 }