Improve form sharing security

[NathanRodet]

Describe the problem to be solved

Problem

Grist's form creation is a great feature, but only being able to share anonymous form links could be security and observability issues.

• Access Control : No option to limit form access to specific user groups or authenticated users.
• User Tracking : Inability to track who submitted form responses.

Risks

• Confidentiality : Forms are accessible to anyone with the link, restricting the type of information that can be shared due to potential confidentiality leaks.
• Denial of Service : Publicly available forms could be vulnerable to DoS attacks; an attacker could flood with responses, causing database to grow.

Describe the solution you would like

Proposed Solutions

• Introduce the option of access control through authentication to the platform when sharing a link. To limit form access to specific users or at least authenticated ones.