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permissions.guard.ts
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permissions.guard.ts
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import {
CanActivate,
ExecutionContext,
ForbiddenException,
Injectable,
Type,
} from '@nestjs/common';
import { Request, Response } from 'express';
import { claimCheck, InsufficientScopeError } from 'express-oauth2-jwt-bearer';
import { promisify } from 'util';
function createPermissionsGuard(
requiredRoutePermissions: string[],
): Type<CanActivate> {
@Injectable()
class PermissionsGuardImpl implements CanActivate {
async canActivate(context: ExecutionContext): Promise<boolean> {
const request = context.switchToHttp().getRequest<Request>();
const response = context.switchToHttp().getResponse<Response>();
const permissionCheck = promisify(
claimCheck((payload) => {
const permissionsJwtClaim = (payload.permissions as string[]) || [];
const hasRequiredRoutePermissions = requiredRoutePermissions.every(
(requiredRoutePermission) =>
permissionsJwtClaim.includes(requiredRoutePermission),
);
if (!hasRequiredRoutePermissions) {
throw new InsufficientScopeError();
}
return hasRequiredRoutePermissions;
}),
);
try {
await permissionCheck(request, response);
return true;
} catch (error) {
throw new ForbiddenException('Permission denied');
}
}
}
return PermissionsGuardImpl;
}
export const PermissionsGuard = (
routePermissions: string[],
): Type<CanActivate> => createPermissionsGuard(routePermissions);