[Admin Core] Implement RoleAlreadyGranted check in grant

[p3ris0n]

Epic: RBAC Implementation (Wave 2)
Bucket: Admin Core

📝 Description

Validation check.

🛠️ Implementation Guide

1. Read current role.
2. Perform Bitwise AND check.
3. Revert if role is already granted.

✅ Acceptance Criteria

• Code compiles and adheres to Soroban/Rust/TypeScript best practices.
• Unit tests cover both happy paths and expected error states.
• All CI/CD pipelines pass successfully.

[Nathanpvd]

@Nathanpvd has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I’ve carefully examined the requirements and can work on resolving the problem while making sure the final implementation follows the acceptance criteria.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Nathanpvd to this issue.

[abdulqudus-dev]

@abdulqudus-dev has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

hi maintainer, i would like to work on this issue, please assign it to me

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[GdAyo19]

@GdAyo19 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Please assign this issue to me

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[harryjupiter148]

@harryjupiter148 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello, Maintainer. Please, permit me to work on this issue.

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[JemimahEkong]

Kindly assign this issue to me

I'll implement the necessary fix

[Priest-Codes]

@Priest-Codes has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

​Hi maintainer, I would love to work on this issue. I can get started on it right away. Could you please assign it to me

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[ibochivincent-lang]

@ibochivincent-lang has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

hello can i work on this ASAP

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[teethaking]

@teethaking has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hey Maintainer,
I'll implement the RoleAlreadyGranted validation check in the RBAC grant function using bitwise logic to prevent duplicate role assignments.
Solution Steps

• Read Current State: In the Soroban contract's grant logic (contracts/.../src/lib.rs), fetch the target account's existing role bitmask from storage.
• Bitwise AND Check: Perform a bitwise AND operation ((current_roles & role_to_grant) != 0) between the target's current role mask and the requested role mask.
• Revert on Duplicate: If the result is non-zero, return/panic with the RoleAlreadyGranted error code.
• Grant & Store: If the check passes, update the account's role bitmask (current_roles | role_to_grant), update storage, and emit the role grant event.
• Unit Testing: Add Rust unit tests in test.rs covering:
  • Happy path granting a new role to an account.
  • Attempting to grant an existing role, asserting it panics with RoleAlreadyGranted.
• CI Verification: Run cargo test and cargo clippy to confirm build validity and passing tests.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @teethaking to this issue.

[Fayyo]

@Fayyo has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi maintainer, please assign this issue to me

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[Sheebazz]

@Sheebazz has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi Maintainer, I have gone through the task and I’d like to work on the RoleAlreadyGranted validation and add the required unit tests. Kindly assign it to me. Thank you.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Sheebazz to this issue.

[drips-wave]

Congratulations, @Fayyo! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @Fayyo: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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