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Add stateless validation for transactions
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| //! Exposes common properties for signed and unsigned transactions | ||
| use ergotree_interpreter::{eval::context::TxIoVec, sigma_protocol::prover::ContextExtension}; | ||
| use ergotree_ir::chain::ergo_box::{BoxId, ErgoBox}; | ||
| use itertools::Itertools; | ||
| use thiserror::Error; | ||
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| use super::{unsigned::UnsignedTransaction, DataInput, Transaction}; | ||
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| /// Errors when validating transaction | ||
| #[derive(Error, Debug)] | ||
| pub enum TxValidationError { | ||
| /// Transaction has more than [`i16::MAX`] inputs | ||
| /// Sum of ERG in outputs has overflowed | ||
| #[error("Sum of ERG in outputs overflowed")] | ||
| OutputSumOverflow, | ||
| /// The transaction is attempting to spend the same [`BoxId`] twice | ||
| #[error("Unique inputs: {0}, actual inputs: {1}")] | ||
| DoubleSpend(usize, usize), | ||
| } | ||
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| /// Exposes common properties for signed and unsigned transactions | ||
| pub trait ErgoTransaction { | ||
| /// input boxes ids | ||
| fn inputs_ids(&self) -> TxIoVec<BoxId>; | ||
| /// data input boxes | ||
| fn data_inputs(&self) -> Option<TxIoVec<DataInput>>; | ||
| /// output boxes | ||
| fn outputs(&self) -> TxIoVec<ErgoBox>; | ||
| /// ContextExtension for the given input index | ||
| fn context_extension(&self, input_index: usize) -> Option<ContextExtension>; | ||
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| /// Stateless transaction validation (no blockchain context) for a transaction | ||
| /// Returns [`Ok(())`] if validation has succeeded or returns [`TxValidationError`] | ||
| fn validate_stateless(&self) -> Result<(), TxValidationError> { | ||
| // Note that we don't need to check if inputs/data inputs/outputs are >= 1 <= 32767 here since BoundedVec takes care of that | ||
| let inputs = self.inputs_ids(); | ||
| let outputs = self.outputs(); | ||
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| // TODO: simplify this once try_reduce is stable | ||
| // TODO: Check if outputs are not dust (this should be done outside of validate_stateless since this depends on blockchain parameters) | ||
| outputs | ||
| .iter() | ||
| .try_fold(0i64, |a, b| a.checked_add(b.value.as_i64())) | ||
| .ok_or(TxValidationError::OutputSumOverflow)?; | ||
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| // Check if there are no double-spends in input (one BoxId being spent more than once) | ||
| let unique_count = inputs.iter().unique().count(); | ||
| if unique_count != inputs.len() { | ||
| return Err(TxValidationError::DoubleSpend(unique_count, inputs.len())); | ||
| } | ||
| Ok(()) | ||
| } | ||
| } | ||
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| impl ErgoTransaction for UnsignedTransaction { | ||
| fn inputs_ids(&self) -> TxIoVec<BoxId> { | ||
| self.inputs.clone().mapped(|input| input.box_id) | ||
| } | ||
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| fn data_inputs(&self) -> Option<TxIoVec<DataInput>> { | ||
| self.data_inputs.clone() | ||
| } | ||
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| fn outputs(&self) -> TxIoVec<ErgoBox> { | ||
| #[allow(clippy::unwrap_used)] // box serialization cannot fail? | ||
| self.output_candidates | ||
| .clone() | ||
| .enumerated() | ||
| .try_mapped(|(idx, b)| ErgoBox::from_box_candidate(&b, self.id(), idx as u16)) | ||
| .unwrap() | ||
| } | ||
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| fn context_extension(&self, input_index: usize) -> Option<ContextExtension> { | ||
| self.inputs | ||
| .get(input_index) | ||
| .map(|input| input.extension.clone()) | ||
| } | ||
| } | ||
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| impl ErgoTransaction for Transaction { | ||
| fn inputs_ids(&self) -> TxIoVec<BoxId> { | ||
| self.inputs.clone().mapped(|input| input.box_id) | ||
| } | ||
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| fn data_inputs(&self) -> Option<TxIoVec<DataInput>> { | ||
| self.data_inputs.clone() | ||
| } | ||
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| fn outputs(&self) -> TxIoVec<ErgoBox> { | ||
| self.outputs.clone() | ||
| } | ||
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| fn context_extension(&self, input_index: usize) -> Option<ContextExtension> { | ||
| self.inputs | ||
| .get(input_index) | ||
| .map(|input| input.spending_proof.extension.clone()) | ||
| } | ||
| } |
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