miden-multisig-client 0.14.5

//! Export/import operations for MultisigClient.
//!
//! This module handles exporting proposals to files/strings and
//! importing them back for offline sharing workflows.

use guardian_client::delta_status::Status;
use guardian_shared::SignatureScheme;

use super::MultisigClient;
use crate::error::{MultisigError, Result};
use crate::export::{ExportedProposal, ExportedSignature};

impl MultisigClient {
    /// Exports a proposal to a file for offline sharing.
    ///
    /// This fetches the proposal from GUARDIAN, including all collected signatures,
    /// and writes it to the specified file path as JSON.
    ///
    /// # Example
    ///
    /// ```ignore
    /// client.export_proposal(&proposal_id, "/tmp/proposal.json").await?;
    /// ```
    pub async fn export_proposal(
        &mut self,
        proposal_id: &str,
        path: &std::path::Path,
    ) -> Result<()> {
        let exported = self.export_proposal_to_exported(proposal_id).await?;
        let json = exported.to_json()?;
        std::fs::write(path, json)
            .map_err(|e| MultisigError::InvalidConfig(format!("failed to write file: {}", e)))?;
        Ok(())
    }

    /// Exports a proposal to a JSON string for programmatic use.
    ///
    /// # Example
    ///
    /// ```ignore
    /// let json = client.export_proposal_to_string(&proposal_id).await?;
    /// println!("{}", json);
    /// ```
    pub async fn export_proposal_to_string(&mut self, proposal_id: &str) -> Result<String> {
        let exported = self.export_proposal_to_exported(proposal_id).await?;
        exported.to_json()
    }

    /// Internal helper to create an ExportedProposal from GUARDIAN data.
    ///
    /// # Errors
    ///
    /// Returns an error if:
    /// - The proposal is not found in GUARDIAN
    /// - The raw delta cannot be found in GUARDIAN response
    /// - The delta has no pending status with signature data
    async fn export_proposal_to_exported(&mut self, proposal_id: &str) -> Result<ExportedProposal> {
        let account = self.require_account()?.clone();
        let account_id = account.id();
        let mut guardian_client = self.create_authenticated_guardian_client().await?;
        let response = guardian_client
            .get_delta_proposal(&account_id, proposal_id)
            .await
            .map_err(|e| MultisigError::GuardianServer(format!("failed to get proposal: {}", e)))?;
        let raw_proposal = response
            .proposal
            .as_ref()
            .ok_or_else(|| MultisigError::ProposalNotFound(proposal_id.to_string()))?;
        Self::ensure_proposal_account_id(&raw_proposal.account_id, &account_id)?;
        let proposal = crate::proposal::Proposal::from(raw_proposal)?;
        self.verify_proposal_summary_binding(&proposal).await?;

        // Extract signatures - fail if status structure is missing
        let status = raw_proposal.status.as_ref().ok_or_else(|| {
            MultisigError::GuardianServer(format!("proposal {} has no status field", proposal_id))
        })?;

        let status_oneof = status.status.as_ref().ok_or_else(|| {
            MultisigError::GuardianServer(format!("proposal {} has empty status", proposal_id))
        })?;

        let pending = match status_oneof {
            Status::Pending(p) => p,
            _ => {
                return Err(MultisigError::GuardianServer(format!(
                    "proposal {} is not in pending state",
                    proposal_id
                )));
            }
        };

        let mut signatures = Vec::new();
        for cosigner_sig in pending.cosigner_sigs.iter() {
            if let Some(ref sig) = cosigner_sig.signature {
                let scheme = if sig.scheme.eq_ignore_ascii_case("ecdsa") {
                    SignatureScheme::Ecdsa
                } else {
                    SignatureScheme::Falcon
                };
                signatures.push(ExportedSignature {
                    signer_commitment: cosigner_sig.signer_id.clone(),
                    signature: sig.signature.clone(),
                    scheme,
                    public_key_hex: sig.public_key.clone(),
                });
            }
        }

        let exported =
            ExportedProposal::from_proposal(&proposal, account_id)?.with_signatures(signatures);

        Ok(exported)
    }

    /// Imports a proposal from a file.
    ///
    /// The proposal can then be signed with `sign_imported_proposal`
    /// or executed with `execute_imported_proposal`.
    ///
    /// # Example
    ///
    /// ```ignore
    /// let proposal = client.import_proposal("/tmp/proposal.json").await?;
    /// println!("Imported proposal: {}", proposal.id);
    /// ```
    pub async fn import_proposal(&mut self, path: &std::path::Path) -> Result<ExportedProposal> {
        let json = std::fs::read_to_string(path)
            .map_err(|e| MultisigError::InvalidConfig(format!("failed to read file: {}", e)))?;
        self.import_proposal_from_string(&json).await
    }

    /// Imports a proposal from a JSON string.
    ///
    /// # Example
    ///
    /// ```ignore
    /// let proposal = client.import_proposal_from_string(&json).await?;
    /// ```
    pub async fn import_proposal_from_string(&mut self, json: &str) -> Result<ExportedProposal> {
        let exported = ExportedProposal::from_json(json)?;
        exported.validate(self.account.as_ref().map(|account| account.id()))?;

        let proposal = exported.to_proposal()?;
        self.verify_proposal_summary_binding(&proposal).await?;

        Ok(exported)
    }
}