taler-rust

GNU Taler code in Rust. Largely core banking integrations.
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prepared.rs (4477B)

      1 /*
      2   This file is part of TALER
      3   Copyright (C) 2026 Taler Systems SA
      4 
      5   TALER is free software; you can redistribute it and/or modify it under the
      6   terms of the GNU Affero General Public License as published by the Free Software
      7   Foundation; either version 3, or (at your option) any later version.
      8 
      9   TALER is distributed in the hope that it will be useful, but WITHOUT ANY
     10   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
     11   A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details.
     12 
     13   You should have received a copy of the GNU Affero General Public License along with
     14   TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
     15 */
     16 
     17 use std::sync::Arc;
     18 
     19 use axum::{
     20     Json, Router,
     21     extract::State,
     22     http::StatusCode,
     23     response::IntoResponse as _,
     24     routing::{get, post},
     25 };
     26 use jiff::{SignedDuration, Timestamp};
     27 use taler_common::{
     28     api::prepared::{
     29         PreparedTransferConfig, RegistrationRequest, RegistrationResponse, SubjectFormat,
     30         TransferSubject, Unregistration,
     31     },
     32     db::IncomingType,
     33     error_code::ErrorCode,
     34     signature::Signature,
     35     types::amount::Currency,
     36 };
     37 
     38 use super::TalerApi;
     39 use crate::{
     40     api::{Validation, check_currency},
     41     constants::PREPARED_TRANSFER_API_VERSION,
     42     error::{ApiResult, failure_code},
     43     extract::Req,
     44     subject::fmt_in_subject,
     45 };
     46 
     47 pub trait PreparedTransfer: TalerApi {
     48     fn supported_formats(&self) -> &[SubjectFormat];
     49     fn registration(
     50         &self,
     51         req: RegistrationRequest,
     52     ) -> impl std::future::Future<Output = ApiResult<RegistrationResponse>> + Send;
     53     fn unregistration(
     54         &self,
     55         req: Unregistration,
     56     ) -> impl std::future::Future<Output = ApiResult<bool>> + Send;
     57 }
     58 
     59 impl Validation for RegistrationRequest {
     60     fn check(&self, currency: &Currency) -> ApiResult<()> {
     61         if !self.verify(&self.authorization_pub, &self.authorization_sig) {
     62             return Err(failure_code(ErrorCode::BANK_BAD_SIGNATURE));
     63         }
     64         check_currency(currency, &self.credit_amount)
     65     }
     66 }
     67 
     68 impl Validation for Unregistration {
     69     fn check(&self, _: &Currency) -> ApiResult<()> {
     70         let duration = self.timestamp.duration_until(Timestamp::now());
     71         if duration > SignedDuration::from_mins(5) || duration.is_negative() {
     72             return Err(failure_code(ErrorCode::BANK_OLD_TIMESTAMP));
     73         };
     74 
     75         if !self.verify(&self.authorization_pub, &self.authorization_sig) {
     76             return Err(failure_code(ErrorCode::BANK_BAD_SIGNATURE));
     77         }
     78         Ok(())
     79     }
     80 }
     81 
     82 pub fn simple_subject(req: RegistrationRequest) -> TransferSubject {
     83     TransferSubject::Simple {
     84         credit_amount: req.credit_amount,
     85         subject: if req.authorization_pub == req.account_pub && !req.recurrent {
     86             fmt_in_subject(req.r#type.into(), &req.account_pub).to_string()
     87         } else {
     88             fmt_in_subject(IncomingType::map, &req.authorization_pub).to_string()
     89         },
     90     }
     91 }
     92 
     93 pub fn router<I: PreparedTransfer>(state: Arc<I>) -> Router {
     94     Router::new()
     95         .route(
     96             "/registration",
     97             post(
     98                 async |State(state): State<Arc<I>>, Req(req): Req<RegistrationRequest>| {
     99                     req.check(&state.currency())?;
    100                     let res = state.registration(req).await?;
    101                     ApiResult::Ok(Json(res))
    102                 },
    103             ),
    104         )
    105         .route(
    106             "/unregistration",
    107             post(
    108                 async |State(state): State<Arc<I>>, Req(req): Req<Unregistration>| {
    109                     req.check(&state.currency())?;
    110                     if state.unregistration(req).await? {
    111                         ApiResult::Ok(StatusCode::NO_CONTENT)
    112                     } else {
    113                         Err(failure_code(ErrorCode::BANK_TRANSACTION_NOT_FOUND))
    114                     }
    115                 },
    116             ),
    117         )
    118         .route(
    119             "/config",
    120             get(async |State(state): State<Arc<I>>| {
    121                 Json(PreparedTransferConfig {
    122                     name: (),
    123                     version: PREPARED_TRANSFER_API_VERSION,
    124                     currency: state.currency(),
    125                     implementation: Some(state.implementation()),
    126                     supported_formats: state.supported_formats().to_vec(),
    127                 })
    128                 .into_response()
    129             }),
    130         )
    131         .with_state(state)
    132 }