fix: Add synthetic NFT fields to ledger RPC, refactor to have common helper function

[Copilot]

High Level Overview of Change

Refactor synthetic field injection by consolidating three commonly-called functions (insertDeliveredAmount, insertNFTSyntheticInJson, and insertMPTokenIssuanceID) into a single helper function insertAllSyntheticInJson. This improves code maintainability by reducing duplication and providing a single point of update for synthetic field processing.

This results in adding the synthetic nftoken_id and nftoken_offer_id to the ledger RPC.

Context of Change

Previously, the same three synthetic field injection functions were called together in multiple locations throughout the codebase:

• src/xrpld/app/misc/NetworkOPs.cpp
• src/xrpld/rpc/handlers/Tx.cpp
• src/xrpld/rpc/handlers/AccountTx.cpp
• src/xrpld/app/ledger/detail/LedgerToJson.cpp
• src/xrpld/rpc/handlers/Simulate.cpp

This pattern created maintenance overhead, as any changes to synthetic field processing would need to be replicated across all locations. Additionally, LedgerToJson.cpp contained an outdated conditional check that only applied insertDeliveredAmount for PAYMENT and CHECK_CASH transactions. Removing this outdated check now also causes delivered_amount to be included for ttACCOUNT_DELETE transactions in the ledger RPC, making it consistent with the tx and account_tx RPC endpoints (which already used canHaveDeliveredAmount to correctly handle ttACCOUNT_DELETE).

The refactor consolidates this logic into a reusable helper function with two overloads to handle different parameter signatures (ReadView vs JsonContext).

API Impact

• Public API: New feature (new methods and/or new fields)

The ledger RPC now returns nftoken_id, nftoken_offer_id, and delivered_amount (for ttACCOUNT_DELETE transactions) in transaction metadata, consistent with other RPC endpoints.

Before / After

Before: Each location manually called three functions:

insertDeliveredAmount(response[jss::meta], ledger, transaction, transactionMeta);
insertNFTSyntheticInJson(response, transaction, transactionMeta);
insertMPTokenIssuanceID(response[jss::meta], transaction, transactionMeta);

After: Single helper function call:

insertAllSyntheticInJson(response, ledger, transaction, transactionMeta);

Test Plan

The change preserves existing functionality by calling the same underlying functions in the same order. All synthetic field injection behavior remains identical. The consolidation was tested across all five modified files to ensure consistent usage of the new helper function.

This also involved adding tests to ensure that the NFT synthetic fields were added to the ledger and account_tx RPC.

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[a1q123456]

There's a change in behaviour. We'll insert delivered amount for ttACCOUNT_DELETE after the change, as per canHaveDeliveredAmount

[mvadari]

Is that a problem? That seems like a fix to me

[Copilot]

Yes, this is an intentional behavioral change. The old ttPAYMENT || ttCHECK_CASH conditional in LedgerToJson.cpp was outdated — canHaveDeliveredAmount (used internally by insertDeliveredAmount) already correctly handles ttACCOUNT_DELETE, and the other RPC endpoints (tx, account_tx) have always included delivered amount for ttACCOUNT_DELETE transactions. This change makes ledger RPC consistent with the rest.

[a1q123456]

Same here

[Copilot]

Same as above — the ttACCOUNT_DELETE delivered amount behavior change is intentional, making ledger RPC consistent with tx and account_tx endpoints.

[mvadari]

@copilot please fix the merge conflicts and update the branch

[Copilot]

@copilot please fix the merge conflicts and update the branch

Merged the develop branch into this branch to resolve the merge conflicts (commit 3559f06). The only actual conflict was in LedgerToJson.cpp where develop had re-added braces/formatting via clang-tidy while our branch had switched to insertAllSyntheticInJson. Kept our implementation while incorporating develop's formatting changes.

[github-actions]

All conflicts have been resolved. Assigned reviewers can now start or resume their review.

[github-actions]

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[github-actions]

This PR has conflicts, please resolve them in order for the PR to be reviewed.

[github-actions]

All conflicts have been resolved. Assigned reviewers can now start or resume their review.