How to route requests to right tenant api gateway?
I am creating a multi tenant silo mode architecture to support a SAAS application. Following this link.
I am able to register new tenants and create their respective stack like this:
So far so good, the next step is to create each tenant its own domain, for example: tenant1.admin.foo.com, to access the same CloudFront distribution (the web front end must be the same for all). I can make this by creating a record in Route53 *.admin.foo.com that has access to CloudFront
THE PROBLEM:
I need to route every request to their respective tenant stack, for example: tenant1.api.foo.com/whatever should route to the api gateway created for tenant1.
At first I thought of creating an origin in CloudFront that routes to the api gateway, the problem with this is that CloudFront origins are limited to 25.
I was thinking in creating a record in Route53 to point to their respective api gateway, but the problem is that I will have to use custom domain in the api gateway, because they are limited to 120, and I expect to have more tenants than 120.
How can I make this routing?
Here is an illustration of a use case:
PS: Any advice is welcome.
You can setup a distribution with a wildcard (*.api.foo.com) set for the Alternate Domain Name (CNAMEs). If you attach a Lambda@Edge to the Origin Request (Under Cache Behavior settings), you can dynamically modify the host header to point to the appropriate API Gateway host (xxxxxx.execute-api.us-east-1.amazonaws.com).
AWS Blog where they did this, with S3 buckets for the origin. It should translate fairly closely to APIGateway hostnames instead: