Multi Tenancy approach - UserId to N Tenants - aspnetboilerplate

Can I register same user (login/e-mail) in more than on tenant, so an UserId can belong to multiple Tenants?
I ask that because instead of input Tenant on login, How hard is to achieve this approach below?
When user logs in, if they belong to multiple tenants, boilerplate will identify this and show the user a select dropdown to choose which tenant they want to manage.
I feel this approach is more professional than input a tenant string value on login page.

it's not possible in aspnetboilerplate structure. a user must belong to only a single tenant.

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AWS Cognito use custom attribute to map Spring application ROLE instead of cognito:groups

In my application the users are split in 2 macro categories: Customer and Backoffice, every category has a subset of role, for example MANAGER and USER for Customer type and different ones for the Backoffice type.
So a user could be a Customer with a MANAGER role or a Backoffice with, for example, a SALES role.
Every Spring + Cognito guide on web uses cognito:groups to map the Spring ROLE, but for my case I would need to nest groups which is not possible on Cognito.
I've been thinking to use 2 custom attributes ( writable only by the admin) to set the category and role of the user respectively.
My question is, is there any disadvantage to using attributes instead of the groups?
One major concern is, those custom attributes won't be available as claims in the access token. But groups are available. So If you plan to use acces_token you may have to consider that.
There are some other minor considerations that I can think of, which may or may not be related your implementation:
Maximum number of custom attributes per user pool is 50.
Once created, you can not edit the name, min/max length and mutable property of the custom attribute. Also we can not delete that.
Even though nested groups are not supported in Cognito, is it not an option to create groups like: category_role? example: Customer_ MANAGER?

What is the "customer's user ID"?

In the Preventing duplicate Items article, it mentions that you can use a specific combination of fields to determine if there are duplicate items or not. And specifically OAuth institutions, it says the combination of fields are: customer's user ID and institution_id. I'm confused what the customer's user ID is. I'm not familiar with this identifier. Can somebody explain?
The customer's user ID would be a value in your own application's business logic, not part of the Plaid API. In most Plaid use cases, alongside an Item, you would typically store some kind of user id that associates it with a specific user in your system. The logic here is saying that if the same end user in your system has multiple Items with the same institution, they are probably duplicate Items.

How to filter data in CDS(powerapps) to restrict unauthorized users

I have created a custom entity in common data services(CDS) that streams in data from a survey.
I'll however need to give access to the data to various people. In my dataset, I have a column called community, which should represent which people have access to what data based on the community they've entered the column.
How exactly can I filter the data, after it has streamed in to ensure I only give access to people of a particular community. And yes every community is exclusive, no two people can be in two different communities.
I want to filter by the community, such that those in community A see only A and not B or C.
There’s no straight one step OOB configuration to achieve this. Because the row level security depends on the column value ie. community field value of each record.
One way is to create owner teams and add the users to right teams, then the custom entity record has to be owned by respective team - owner team of each custom entity record can be filled/assigned automatically based on the community field value on create using plugin/workflow/Flow.
Most important, in security role for that custom entity - read privilege has to be given only for user level. Assign the security role to Teams.

Migrate User Between Tenants

I want to implement a function to migrate a user from one tenant to another.
I know this could be achieved simply by change user's tenant id.
The problem is, I have an order has this user id and tenant id recorded, if I simply updated this user's tenant id, i won't be able to locate the user using the data recorded in the order.
If I have to update all the orders during migrating process, this could take up a long time for a large database.
Since the default PK type for ABP is long, is it possible to replace it as guid or are there any options I could choose?
Thanks.

Laravel authorization via email, password and additional field

Out of the box Laravel authorizes users by matching email (default - can be overridden) and password.
Is it possible to authorize user using 3 fields, e.g:
email
password
group
... where 'group' is some additional field from 'users' database.
In other words, user can belong to group:1 and can login to group:1 resources only, but not to group:2 using his group:1 credentials.
If user belongs to group:1 and group:2, then he needs different credentials to login to either group.
Additionally, user can use same email for both groups. In such case it is group number that would act as additional identifier. And of course passwords would be different.
I am thinking setting a database multiple column index on fields 'id' and 'group' would be a good start, but I fail to grasp (yet), what would be required to make Laravel authorization process sensitive to 3 fields, instead of 2.
I would appreciate some pointers.
This sounds like you're trying to achieve a form of tenancy on data belonging to certain groups only. Have a look at this package:
https://github.com/HipsterJazzbo/Landlord
In essence, you would add a group_id field to the tables where you wish to restrict access and then using middleware, apply an additional where('group_id', Auth::user()->group_id) clause to any database queries. This works very well for retrieving subsets of data belonging to specific users by their role, for example.

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