638 lines
23 KiB
Rust
638 lines
23 KiB
Rust
//! Typed bodies for authenticated, single-delivery purchase POST endpoints.
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//! The handler verifies v2 method/path/audience/exact-body proof before calling.
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use crate::{
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content_purchase::{Acceptance, Contract, Journal, Receipt, SellerPhase},
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wallet::{ecash::EcashNetwork, mint_client::MintClient, purchase_fee_plan::FeePlan},
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};
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use anyhow::{Context, Result};
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use serde::{Deserialize, Serialize};
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use std::path::Path;
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pub(crate) const PREPARE_OFFER_ROUTE: &str = "/content/purchase/v1/prepare-offer";
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pub(crate) const OFFER_ROUTE: &str = "/content/purchase/v1/offer";
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pub(crate) const ACCEPT_ROUTE: &str = "/content/purchase/v1/accept";
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pub(crate) const SETTLE_ROUTE: &str = "/content/purchase/v1/settle";
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pub(crate) const STATUS_ROUTE: &str = "/content/purchase/v1/status";
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#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
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#[serde(deny_unknown_fields)]
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pub(crate) struct Offer {
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pub id: String,
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pub buyer_did: String,
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pub seller_did: String,
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pub content_id: String,
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pub filename: String,
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pub mime_type: String,
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pub content_sha256: String,
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pub content_size: u64,
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#[serde(default)]
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pub viewing_seconds: Option<u64>,
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pub terms_sha256: String,
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pub network: EcashNetwork,
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pub mint_url: String,
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pub seller_net_sats: u64,
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pub offered_at: i64,
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pub expires_at: i64,
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}
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impl Offer {
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pub fn validate(&self) -> Result<()> {
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anyhow::ensure!(
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if self.content_id.starts_with("registered_") {
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self.viewing_seconds
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.is_some_and(|seconds| (1..=31_536_000).contains(&seconds))
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} else {
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self.viewing_seconds.is_none()
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},
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"Offer rental duration binding is invalid"
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);
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anyhow::ensure!(
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!self.filename.is_empty()
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&& self.filename.len() <= 4096
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&& !self.filename.chars().any(char::is_control),
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"Invalid offer filename"
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);
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anyhow::ensure!(
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self.mime_type.len() <= 128
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&& self.mime_type.parse::<hyper::header::HeaderValue>().is_ok(),
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"Invalid offer MIME type"
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);
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let contract = Contract {
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version: 1,
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id: self.id.clone(),
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buyer_did: self.buyer_did.clone(),
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seller_did: self.seller_did.clone(),
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content_id: self.content_id.clone(),
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content_sha256: self.content_sha256.clone(),
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content_size: self.content_size,
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terms_sha256: self.terms_sha256.clone(),
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network: self.network,
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mint_url: self.mint_url.clone(),
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gross_token_sats: self.seller_net_sats,
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minimum_net_sats: self.seller_net_sats,
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offered_at: self.offered_at,
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expires_at: self.expires_at,
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};
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contract.validate()
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}
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pub fn contract(&self, plan: &FeePlan) -> Result<Contract> {
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self.validate()?;
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plan.validate()?;
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anyhow::ensure!(
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plan.mint_url == self.mint_url && plan.net_sats >= self.seller_net_sats,
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"Payment plan does not cover this offer"
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);
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let contract = Contract {
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version: 1,
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id: self.id.clone(),
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buyer_did: self.buyer_did.clone(),
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seller_did: self.seller_did.clone(),
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content_id: self.content_id.clone(),
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content_sha256: self.content_sha256.clone(),
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content_size: self.content_size,
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terms_sha256: self.terms_sha256.clone(),
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network: self.network,
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mint_url: self.mint_url.clone(),
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gross_token_sats: plan.gross_sats,
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minimum_net_sats: self.seller_net_sats,
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offered_at: self.offered_at,
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expires_at: self.expires_at,
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};
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contract.validate()?;
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Ok(contract)
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}
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}
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#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
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#[serde(deny_unknown_fields)]
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pub(crate) struct Envelope {
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pub offer: Offer,
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pub fee_plan: FeePlan,
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}
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impl Envelope {
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pub fn contract(&self) -> Result<Contract> {
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self.offer.contract(&self.fee_plan)
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}
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pub fn commitment(&self) -> Result<String> {
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use sha2::{Digest, Sha256};
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let contract = self.contract()?;
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// Explicit ordered components: never hash an incidental map ordering.
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Ok(hex::encode(Sha256::digest(serde_json::to_vec(&(
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"archipelago-purchase-envelope-v1",
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contract.context_hash()?,
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self.fee_plan.commitment()?,
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&self.offer.filename,
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&self.offer.mime_type,
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self.offer.viewing_seconds,
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))?)))
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}
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}
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#[derive(Clone, Serialize, Deserialize)]
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#[serde(deny_unknown_fields)]
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pub(crate) struct Accepted {
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pub envelope_sha256: String,
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pub acceptance: Acceptance,
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}
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#[derive(Clone, Serialize, Deserialize)]
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#[serde(deny_unknown_fields)]
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pub(crate) struct Settlement {
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pub envelope: Envelope,
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pub token: String,
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}
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#[derive(Clone, Serialize, Deserialize)]
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#[serde(tag = "state", rename_all = "snake_case")]
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pub(crate) enum SellerStatus {
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Accepted,
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Cancelled,
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Settled { receipt: Receipt },
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}
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/// Match the policy used by fresh seller redemption before inviting a spend.
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/// Settled receipts remain recoverable independently of later wallet settings.
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pub(crate) async fn ensure_seller_mint_policy(
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data_dir: &Path,
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network: crate::wallet::ecash::EcashNetwork,
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mint_url: &str,
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) -> Result<()> {
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use crate::{content_purchase::canonical_mint, wallet::ecash};
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anyhow::ensure!(
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ecash::load_network(data_dir).await? == network,
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"Seller wallet is on another payment network; no new payment should be sent"
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);
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let accepted = ecash::load_accepted_mints(data_dir).await?;
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let mint = canonical_mint(mint_url)?;
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anyhow::ensure!(
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accepted
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.mints
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.iter()
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.any(|candidate| canonical_mint(candidate).ok().as_deref() == Some(mint.as_str())),
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"Seller does not accept the quoted mint; no new payment should be sent"
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);
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Ok(())
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}
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/// Caller obtained these fields from a currently shared, immutable verified
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/// snapshot (registered_terms/ordinary catalog snapshot), never from client JSON.
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/// Save before returning the offer; replay always returns original terms.
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pub(crate) async fn save_offer(
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data_dir: &Path,
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offered: &Offer,
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verified_buyer: &str,
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now: i64,
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) -> Result<Offer> {
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anyhow::ensure!(offered.buyer_did == verified_buyer, "Offer buyer mismatch");
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ensure_seller_mint_policy(data_dir, offered.network, &offered.mint_url).await?;
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let journal = Journal::open(data_dir).await?;
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if let Some(saved) = journal.protocol_offer(&offered.id).await? {
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anyhow::ensure!(
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saved.buyer_did == verified_buyer && saved.content_id == offered.content_id,
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"Offer operation changed buyer/content"
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);
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return Ok(saved);
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}
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anyhow::ensure!(
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now >= offered.offered_at && now < offered.expires_at,
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"Offer is expired"
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);
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journal.save_protocol_offer(offered).await?;
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Ok(offered.clone())
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}
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/// POST ACCEPT_ROUTE. Persist both fee commitment and liability before replying.
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pub(crate) async fn accept(
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data_dir: &Path,
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envelope: &Envelope,
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verified_buyer: &str,
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now: impl Fn() -> i64,
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) -> Result<Accepted> {
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let contract = envelope.contract()?;
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anyhow::ensure!(
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contract.buyer_did == verified_buyer,
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"Acceptance buyer mismatch"
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);
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{
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let journal = Journal::open(data_dir).await?;
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let offer = journal
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.protocol_offer(&contract.id)
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.await?
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.context("Seller offer is missing")?;
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anyhow::ensure!(offer == envelope.offer, "Seller offer changed");
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if let Some(previous) = journal.protocol_envelope("seller", &contract.id).await? {
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anyhow::ensure!(previous == *envelope, "Accepted payment shape changed");
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if let Some(record) = journal.seller(&contract.id).await? {
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return Ok(Accepted {
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envelope_sha256: envelope.commitment()?,
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acceptance: record.acceptance()?,
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});
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}
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}
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}
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ensure_seller_mint_policy(data_dir, contract.network, &contract.mint_url).await?;
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// No database lock across remote mint query. Recheck durable binding/time
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// when committing below, so concurrent acceptance cannot alter the plan.
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let keysets = MintClient::new(&contract.mint_url)?.get_keysets().await?;
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envelope.fee_plan.verify_mint_keysets(&keysets, false)?;
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// Same wallet -> purchase lock order as policy updates: an accepted
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// liability cannot race removal of its mint or a network switch.
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let _wallet = crate::wallet::mutation::guard(data_dir).await?;
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ensure_seller_mint_policy(data_dir, contract.network, &contract.mint_url).await?;
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let journal = Journal::open(data_dir).await?;
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anyhow::ensure!(
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journal.protocol_offer(&contract.id).await?.as_ref() == Some(&envelope.offer)
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&& !journal.retired_offer_matches(&envelope.offer).await?,
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"Original offer retired before acceptance; recover cancellation without spending"
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);
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journal.save_protocol_envelope("seller", envelope).await?;
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let record = journal.prepare_seller(&contract, now()).await?;
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Ok(Accepted {
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envelope_sha256: envelope.commitment()?,
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acceptance: record.acceptance()?,
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})
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}
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/// POST SETTLE_ROUTE. Accepting new liability is deliberately impossible here.
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pub(crate) async fn settle(
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data_dir: &Path,
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request: &Settlement,
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verified_buyer: &str,
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) -> Result<Receipt> {
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let contract = request.envelope.contract()?;
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anyhow::ensure!(
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contract.buyer_did == verified_buyer,
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"Settlement buyer mismatch"
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);
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{
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let journal = Journal::open(data_dir).await?;
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let saved = journal
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.protocol_envelope("seller", &contract.id)
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.await?
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.context("Seller acceptance is missing")?;
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anyhow::ensure!(
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saved == request.envelope,
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"Settlement changed accepted payment shape"
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);
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}
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request.envelope.fee_plan.validate_token(&request.token)?;
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crate::content_purchase_executor::settle_seller_token(
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data_dir,
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&contract,
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&request.token,
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verified_buyer,
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)
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.await
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}
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/// POST STATUS_ROUTE. Read-only, bound to buyer and exact accepted envelope.
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pub(crate) async fn status(
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data_dir: &Path,
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envelope: &Envelope,
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verified_buyer: &str,
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) -> Result<SellerStatus> {
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let contract = envelope.contract()?;
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anyhow::ensure!(
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contract.buyer_did == verified_buyer,
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"Status buyer mismatch"
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);
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let journal = Journal::open(data_dir).await?;
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anyhow::ensure!(
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journal
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.protocol_envelope("seller", &contract.id)
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.await?
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.as_ref()
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== Some(envelope),
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"Accepted operation not found"
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);
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let record = journal
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.seller(&contract.id)
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.await?
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.context("Accepted operation not found")?;
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match record.phase {
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SellerPhase::ReceiptSaved(receipt) => Ok(SellerStatus::Settled { receipt }),
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SellerPhase::Cancelled => Ok(SellerStatus::Cancelled),
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_ => {
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ensure_seller_mint_policy(data_dir, contract.network, &contract.mint_url).await?;
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Ok(SellerStatus::Accepted)
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}
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}
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}
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pub(crate) const CANCEL_ROUTE: &str = "/content/purchase/v1/cancel";
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#[derive(Clone, Serialize, Deserialize)]
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#[serde(deny_unknown_fields)]
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pub(crate) struct Cancelled {
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pub envelope_sha256: String,
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}
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/// Authenticated buyer sealed its wallet before requesting cancellation. The
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/// seller only seals an unfunded intent and rejects every subsequent late accept.
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pub(crate) async fn cancel(
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data_dir: &Path,
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envelope: &Envelope,
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verified_buyer: &str,
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) -> Result<Cancelled> {
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let contract = envelope.contract()?;
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anyhow::ensure!(
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contract.buyer_did == verified_buyer,
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"Cancellation buyer changed"
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);
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let journal = Journal::open(data_dir).await?;
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anyhow::ensure!(
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journal.protocol_offer(&contract.id).await?.as_ref() == Some(&envelope.offer)
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|| journal.retired_offer_matches(&envelope.offer).await?,
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"Original seller offer changed"
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);
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journal.save_protocol_envelope("seller", envelope).await?;
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journal.cancel_seller(&contract).await?;
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Ok(Cancelled {
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envelope_sha256: envelope.commitment()?,
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})
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::wallet::{
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cashu::{CashuToken, Proof},
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purchase_fee_plan::KeysetPlan,
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};
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fn envelope() -> Envelope {
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let buyer = crate::identity::did_key_from_pubkey_hex(&hex::encode([1u8; 32])).unwrap();
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let seller = crate::identity::did_key_from_pubkey_hex(&hex::encode([2u8; 32])).unwrap();
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let fee_plan = FeePlan::from_shape(
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"https://unused-mint.invalid",
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vec![KeysetPlan {
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keyset_id: "0011223344556677".into(),
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denominations: vec![8],
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input_fee_ppk: 0,
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}],
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)
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.unwrap();
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Envelope {
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offer: Offer {
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id: uuid::Uuid::new_v4().to_string(),
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buyer_did: buyer,
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seller_did: seller,
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content_id: "registered_film".into(),
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filename: "film.mp4".into(),
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mime_type: "video/mp4".into(),
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content_sha256: "ab".repeat(32),
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content_size: 10,
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viewing_seconds: Some(60),
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terms_sha256: "cd".repeat(32),
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network: EcashNetwork::Mainnet,
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mint_url: "https://unused-mint.invalid".into(),
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seller_net_sats: 8,
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offered_at: 1000,
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expires_at: 1100,
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},
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fee_plan,
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}
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}
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#[tokio::test]
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async fn unaccepted_mint_cannot_publish_offer_and_cancel_releases_policy_pin() {
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use crate::wallet::ecash::{
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save_accepted_mints, save_network, AcceptedMints, EcashNetwork,
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};
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let root = tempfile::tempdir().unwrap();
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let value = envelope();
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let buyer = &value.offer.buyer_did;
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assert!(save_offer(root.path(), &value.offer, buyer, 1001)
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.await
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.is_err());
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assert!(Journal::open(root.path())
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.await
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.unwrap()
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.protocol_offer(&value.offer.id)
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.await
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.unwrap()
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.is_none());
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save_accepted_mints(
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root.path(),
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&AcceptedMints {
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mints: vec![value.offer.mint_url.clone()],
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},
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)
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.await
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.unwrap();
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save_offer(root.path(), &value.offer, buyer, 1001)
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.await
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.unwrap();
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{
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let journal = Journal::open(root.path()).await.unwrap();
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journal
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.save_protocol_envelope("seller", &value)
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.await
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.unwrap();
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journal
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.prepare_seller(&value.contract().unwrap(), 1001)
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.await
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.unwrap();
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}
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assert!(
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save_accepted_mints(root.path(), &AcceptedMints { mints: vec![] })
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.await
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.is_err()
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);
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assert!(save_network(root.path(), EcashNetwork::Testnet)
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.await
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.is_err());
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cancel(root.path(), &value, buyer).await.unwrap();
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save_accepted_mints(root.path(), &AcceptedMints { mints: vec![] })
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.await
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.unwrap();
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save_network(root.path(), EcashNetwork::Testnet)
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.await
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.unwrap();
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assert!(matches!(
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status(root.path(), &value, buyer).await.unwrap(),
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SellerStatus::Cancelled
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));
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}
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#[tokio::test]
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async fn seller_cancellation_replays_after_lost_reply_and_seals_late_acceptance() {
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let root = tempfile::tempdir().unwrap();
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let value = envelope();
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crate::wallet::ecash::save_accepted_mints(
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root.path(),
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&crate::wallet::ecash::AcceptedMints {
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mints: vec![value.offer.mint_url.clone()],
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},
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)
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.await
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.unwrap();
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let contract = value.contract().unwrap();
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save_offer(root.path(), &value.offer, &contract.buyer_did, 1001)
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.await
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.unwrap();
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{
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let journal = Journal::open(root.path()).await.unwrap();
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journal
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.save_protocol_envelope("seller", &value)
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.await
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.unwrap();
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journal.prepare_seller(&contract, 1001).await.unwrap();
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journal.prepare_buyer(&contract, 1001).await.unwrap();
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journal.begin_cancellation(&contract).await.unwrap();
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}
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let lost = cancel(root.path(), &value, &contract.buyer_did)
|
|
.await
|
|
.unwrap();
|
|
assert!(accept(root.path(), &value, &contract.buyer_did, || 1002)
|
|
.await
|
|
.is_err());
|
|
let replay = cancel(root.path(), &value, &contract.buyer_did)
|
|
.await
|
|
.unwrap();
|
|
assert_eq!(lost.envelope_sha256, replay.envelope_sha256);
|
|
let journal = Journal::open(root.path()).await.unwrap();
|
|
journal
|
|
.finish_cancellation(&contract, &contract.seller_did)
|
|
.await
|
|
.unwrap();
|
|
assert_eq!(
|
|
journal.buyer(&contract.id).await.unwrap().unwrap().phase,
|
|
crate::content_purchase::BuyerPhase::Cancelled
|
|
);
|
|
let delayed = Acceptance {
|
|
contract_hash: contract.context_hash().unwrap(),
|
|
accepted_at: 1001,
|
|
};
|
|
assert!(journal
|
|
.record_acceptance(&contract, &delayed, &contract.seller_did)
|
|
.await
|
|
.is_err());
|
|
}
|
|
#[tokio::test]
|
|
async fn incoming_token_or_saved_settlement_prevents_seller_cancellation() {
|
|
let root = tempfile::tempdir().unwrap();
|
|
let value = envelope();
|
|
crate::wallet::ecash::save_accepted_mints(
|
|
root.path(),
|
|
&crate::wallet::ecash::AcceptedMints {
|
|
mints: vec![value.offer.mint_url.clone()],
|
|
},
|
|
)
|
|
.await
|
|
.unwrap();
|
|
let contract = value.contract().unwrap();
|
|
save_offer(root.path(), &value.offer, &contract.buyer_did, 1001)
|
|
.await
|
|
.unwrap();
|
|
let token = CashuToken::new(
|
|
&contract.mint_url,
|
|
vec![Proof {
|
|
amount: 8,
|
|
id: "0011223344556677".into(),
|
|
secret: "test-original-payment".into(),
|
|
c: "0279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798".into(),
|
|
}],
|
|
)
|
|
.serialize()
|
|
.unwrap();
|
|
{
|
|
let journal = Journal::open(root.path()).await.unwrap();
|
|
journal
|
|
.save_protocol_envelope("seller", &value)
|
|
.await
|
|
.unwrap();
|
|
journal.prepare_seller(&contract, 1001).await.unwrap();
|
|
journal
|
|
.record_incoming_token(&contract, &token)
|
|
.await
|
|
.unwrap();
|
|
}
|
|
assert!(cancel(root.path(), &value, &contract.buyer_did)
|
|
.await
|
|
.is_err());
|
|
let original = {
|
|
let journal = Journal::open(root.path()).await.unwrap();
|
|
journal.record_settlement(&contract, 8).await.unwrap();
|
|
journal.issue_receipt(&contract).await.unwrap()
|
|
};
|
|
assert!(cancel(root.path(), &value, &contract.buyer_did)
|
|
.await
|
|
.is_err());
|
|
crate::wallet::ecash::save_accepted_mints(
|
|
root.path(),
|
|
&crate::wallet::ecash::AcceptedMints { mints: vec![] },
|
|
)
|
|
.await
|
|
.unwrap();
|
|
crate::wallet::ecash::save_network(
|
|
root.path(),
|
|
crate::wallet::ecash::EcashNetwork::Testnet,
|
|
)
|
|
.await
|
|
.unwrap();
|
|
match status(root.path(), &value, &contract.buyer_did)
|
|
.await
|
|
.unwrap()
|
|
{
|
|
SellerStatus::Settled { receipt } => assert!(receipt == original),
|
|
_ => panic!("Original receipt lost"),
|
|
}
|
|
}
|
|
#[tokio::test]
|
|
async fn expired_quote_cap_recovers_without_reusing_ids_or_retiring_accepted_liability() {
|
|
let root = tempfile::tempdir().unwrap();
|
|
let now = chrono::Utc::now().timestamp();
|
|
let mut accepted = envelope();
|
|
accepted.offer.offered_at = now;
|
|
accepted.offer.expires_at = now + 300;
|
|
let mut expired = Vec::new();
|
|
{
|
|
let journal = Journal::open(root.path()).await.unwrap();
|
|
journal.save_protocol_offer(&accepted.offer).await.unwrap();
|
|
journal
|
|
.save_protocol_envelope("seller", &accepted)
|
|
.await
|
|
.unwrap();
|
|
journal
|
|
.prepare_seller(&accepted.contract().unwrap(), now)
|
|
.await
|
|
.unwrap();
|
|
for _ in 0..128 {
|
|
let mut value = accepted.clone();
|
|
value.offer.id = uuid::Uuid::new_v4().to_string();
|
|
journal.save_protocol_offer(&value.offer).await.unwrap();
|
|
expired.push(value);
|
|
}
|
|
let mut next = accepted.clone();
|
|
next.offer.id = uuid::Uuid::new_v4().to_string();
|
|
assert!(journal.save_protocol_offer(&next.offer).await.is_err());
|
|
journal.retire_unaccepted_offers(now + 301).await.unwrap();
|
|
assert!(journal
|
|
.protocol_offer(&accepted.offer.id)
|
|
.await
|
|
.unwrap()
|
|
.is_some());
|
|
assert!(journal.seller(&accepted.offer.id).await.unwrap().is_some());
|
|
assert!(journal
|
|
.protocol_offer(&expired[0].offer.id)
|
|
.await
|
|
.unwrap()
|
|
.is_none());
|
|
assert!(journal
|
|
.retired_offer_matches(&expired[0].offer)
|
|
.await
|
|
.unwrap());
|
|
journal.save_protocol_offer(&next.offer).await.unwrap();
|
|
let mut changed = expired[0].offer.clone();
|
|
changed.expires_at += 300;
|
|
assert!(journal.save_protocol_offer(&changed).await.is_err());
|
|
assert!(!journal.retired_offer_matches(&changed).await.unwrap());
|
|
}
|
|
let original = &expired[0];
|
|
let ack = cancel(root.path(), original, &original.offer.buyer_did)
|
|
.await
|
|
.unwrap();
|
|
assert_eq!(ack.envelope_sha256, original.commitment().unwrap());
|
|
assert_eq!(
|
|
cancel(root.path(), original, &original.offer.buyer_did)
|
|
.await
|
|
.unwrap()
|
|
.envelope_sha256,
|
|
ack.envelope_sha256
|
|
);
|
|
assert!(
|
|
accept(root.path(), original, &original.offer.buyer_did, || now)
|
|
.await
|
|
.is_err()
|
|
);
|
|
}
|
|
}
|