Verifying paymaster

[boqiu]

This change is 

[Copilot]

Pull request overview

Adds verifying-paymaster validation and signing support for EIP-7702 smart accounts.

Changes:

• Adds paymaster stub/sign endpoints, validation, signing, and configuration.
• Adds contract bindings and shared user-operation structures.
• Updates gas-tank integration and API documentation.

Reviewed changes

Copilot reviewed 18 out of 20 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
.env.example	Documents paymaster configuration.
api/controller_verifying_paymaster.go	Implements paymaster endpoints.
api/models.go	Adds authorization-aware input model.
api/route.go	Registers paymaster routes.
contract/SimpleSmartAccount7702.abi.json	Updates smart-account ABI.
contract/SimpleSmartAccount7702.go	Updates generated binding.
contract/VerifyingPaymaster.abi.json	Adds paymaster ABI.
contract/gas_tank_paymaster.go	Shares packed user-operation type.
contract/verifying_paymaster.go	Adds generated paymaster binding.
docs/docs.go	Updates generated API documentation.
docs/swagger.json	Documents paymaster APIs.
docs/swagger.yaml	Documents paymaster APIs.
main.go	Adds the Paymaster API tag.
service/account_abstract.go	Uses shared delegation lookup.
service/blockchain_util.go	Extracts EIP-7702 delegation utility.
service/errors.go	Adds paymaster errors.
service/paymaster_gas_tank.go	Implements gas-tank paymaster logic.
service/paymaster_verifying.go	Implements verifying-paymaster service.
service/paymaster_verifying_test.go	Tests validation behavior.
service/service.go	Initializes the optional service.

Files not reviewed (1)

• docs/docs.go: Generated file

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[Copilot]

Pull request overview

Copilot reviewed 18 out of 20 changed files in this pull request and generated no new comments.

Files not reviewed (1)

• docs/docs.go: Generated file

Suppressed comments (2)

api/models.go:76

• UserOperation is also the request type for the existing /aa/gastank/sign endpoint, which explicitly supports only an empty init code. Making this field required therefore rejects every existing gas-tank client that omits it, forcing an unrelated breaking API change. Keep it optional; the verifying-paymaster validation already requires the marker when delegatedContract is non-zero.

	InitCode             string `json:"initCode" binding:"required,hex,min=2"`

docs/swagger.yaml:193

• The newly generated request schema omits initCode, although the sign handler binds that field and the EOA-upgrade path requires the 0x7702… marker. Clients generated from this Swagger contract cannot discover or model the documented upgrade request. Regenerate all Swagger artifacts so initCode appears in UserOperationWithAuth (and the shared schema, if it remains there).

  api.UserOperationWithAuth: