[Story] Validate and approve presentation as a Holder

[marinakarampatsa]

User Story

Description

As a EUDI Wallet Holder
I want to validate a EUDI Wallet Verifier’s request and approve the presentation
So that I only share information I explicitly consent to

Assumptions

• The user has already activated Wallet-to-Wallet mode and selected the "Holder" role
• The Wallet contains at least one issued attestation in the mdoc format
• The user's device supports BLE for data transfer.
• The Wallet can compare the request with the PresentationOffer (if present).

Acceptance Criteria:

Validation:
These criteria describe what the Wallet must check before the Holder is allowed to approve anything.

• The Wallet checks that the request only asks for information the Holder originally offered (when a Presentation Offer exists).
• The Wallet checks that the request does not include anything the Holder does not have or cannot provide (when no Presentation Offer exists).
• The Wallet checks that all “keep this data” flags (IntentToRetain) are set to false, as required in Wallet-to-Wallet interactions.
• If any part of the request is not allowed, the Wallet immediately stops the process.
• When the request is invalid, the Wallet sends an error response (DeviceResponse with status = 10) and does not share any information.

Approval:
These criteria describe what happens once the request has passed validation, and the Holder is asked to make a decision.

• The Wallet shows the Holder a clear, readable list of the information the Verifier wants to receive.
• The Holder must actively choose whether to share the information or not.
• No data is sent unless the Holder explicitly selects Approve.
• When the Holder approves, the Wallet creates a presentation and sends it to the Verifier.
• After presentation, the Holder sees confirmation that the information has been shared.