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74 lines
2.9 KiB
C++
74 lines
2.9 KiB
C++
#pragma once
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#include <xrpl/protocol/STArray.h>
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#include <optional>
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namespace xrpl {
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/** Single-use converter from a JSON object to an @ref STObject.
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*
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* Sits at the boundary between the JSON/RPC layer and the binary-canonical
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* Serialized Type (ST) system. In a single constructor call it validates
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* every field name against the XRPL protocol schema, coerces each value to
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* its wire type, recurses into nested objects and arrays up to 64 levels
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* deep, and applies the field template for the transaction or ledger-entry
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* type discovered during parsing.
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*
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* Outcomes are communicated through two public members rather than via
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* exceptions or a return value, which lets RPC handlers forward `error`
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* directly to the client without additional formatting work:
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* - On success: `object` holds the populated `STObject`; `error` is empty.
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* - On failure: `object` is `std::nullopt`; `error` is an
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* `rpcINVALID_PARAMS` JSON value with a dot-separated field path
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* (e.g. `"tx_json.Signers[0].Signer.Account"`) pinpointing the offending
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* field.
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*
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* The class is non-copyable and not default-constructible; every instance
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* represents exactly one completed parse attempt.
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*
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* @see TransactionSign.cpp for the primary production call-site.
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*/
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class STParsedJSONObject
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{
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public:
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/** Parse @p json into a strongly-typed @ref STObject.
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*
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* Iterates every member of the JSON object, resolves each field name
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* via `SField::getField()`, recurses into nested objects and arrays,
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* and finally calls `applyTemplateFromSField()` to enforce the field
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* template for the detected transaction or ledger-entry type.
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*
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* All internal exceptions are caught and translated into a structured
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* `rpcINVALID_PARAMS` error stored in `error`; nothing propagates to
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* the caller.
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*
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* @param name The logical name of the top-level field being parsed
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* (e.g. `"tx_json"`); used as the root of dot-separated field-path
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* strings in `error` messages.
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* @param json The JSON object to parse. Must be a JSON object value;
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* non-object input produces an `rpcINVALID_PARAMS` error.
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* @note Does not throw.
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*/
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STParsedJSONObject(std::string const& name, json::Value const& json);
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STParsedJSONObject() = delete;
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STParsedJSONObject(STParsedJSONObject const&) = delete;
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STParsedJSONObject&
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operator=(STParsedJSONObject const&) = delete;
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~STParsedJSONObject() = default;
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/** The parsed object on success, or `std::nullopt` on any parse error. */
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std::optional<STObject> object;
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/** Structured `rpcINVALID_PARAMS` error on failure; empty on success.
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*
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* The JSON value is suitable for forwarding directly to an RPC client.
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* The `"error_message"` field contains a dot-separated field path
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* identifying the first field that failed to parse.
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*/
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json::Value error;
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};
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} // namespace xrpl
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