taler-rust

GNU Taler code in Rust. Largely core banking integrations.
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transfer.rs (4059B)

      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::{str::FromStr, 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_transfer::{
     29         PreparedTransferConfig, RegistrationRequest, RegistrationResponse, SubjectFormat,
     30         Unregistration,
     31     },
     32     error_code::ErrorCode,
     33 };
     34 
     35 use super::TalerApi;
     36 use crate::{
     37     constants::PREPARED_TRANSFER_API_VERSION,
     38     crypto::check_eddsa_signature,
     39     error::{ApiResult, failure, failure_code},
     40     json::Req,
     41 };
     42 
     43 pub trait PreparedTransfer: TalerApi {
     44     fn supported_formats(&self) -> &[SubjectFormat];
     45     fn registration(
     46         &self,
     47         req: RegistrationRequest,
     48     ) -> impl std::future::Future<Output = ApiResult<RegistrationResponse>> + Send;
     49     fn unregistration(
     50         &self,
     51         req: Unregistration,
     52     ) -> impl std::future::Future<Output = ApiResult<()>> + Send;
     53 }
     54 
     55 pub fn router<I: PreparedTransfer>(state: Arc<I>) -> Router {
     56     Router::new()
     57         .route(
     58             "/registration",
     59             post(
     60                 async |State(state): State<Arc<I>>, Req(req): Req<RegistrationRequest>| {
     61                     state.check_currency(&req.credit_amount)?;
     62                     if !check_eddsa_signature(
     63                         &req.authorization_pub,
     64                         req.account_pub.as_ref(),
     65                         &req.authorization_sig,
     66                     ) {
     67                         return Err(failure_code(ErrorCode::BANK_BAD_SIGNATURE));
     68                     }
     69                     let res = state.registration(req).await?;
     70                     ApiResult::Ok(Json(res))
     71                 },
     72             ),
     73         )
     74         .route(
     75             "/unregistration",
     76             post(
     77                 async |State(state): State<Arc<I>>, Req(req): Req<Unregistration>| {
     78                     let timestamp = Timestamp::from_str(&req.timestamp).map_err(|e| {
     79                         failure(ErrorCode::GENERIC_JSON_INVALID, e.to_string())
     80                             .with_path("timestamp")
     81                     })?;
     82                     if timestamp.duration_until(Timestamp::now()) > SignedDuration::from_mins(5) {
     83                         return Err(failure_code(ErrorCode::BANK_OLD_TIMESTAMP));
     84                     }
     85 
     86                     if !check_eddsa_signature(
     87                         &req.authorization_pub,
     88                         req.timestamp.as_ref(),
     89                         &req.authorization_sig,
     90                     ) {
     91                         return Err(failure_code(ErrorCode::BANK_BAD_SIGNATURE));
     92                     }
     93                     state.unregistration(req).await?;
     94                     ApiResult::Ok(StatusCode::NO_CONTENT)
     95                 },
     96             ),
     97         )
     98         .route(
     99             "/config",
    100             get(async |State(state): State<Arc<I>>| {
    101                 Json(PreparedTransferConfig {
    102                     name: "taler-prepared-transfer",
    103                     version: PREPARED_TRANSFER_API_VERSION,
    104                     currency: state.currency(),
    105                     implementation: Some(state.implementation()),
    106                     supported_formats: state.supported_formats().to_vec(),
    107                 })
    108                 .into_response()
    109             }),
    110         )
    111         .with_state(state)
    112 }