taler-rust

GNU Taler code in Rust. Largely core banking integrations.
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headers.rs (2290B)

      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 hyper::{HeaderMap, header::HeaderName};
     18 
     19 #[derive(Debug, thiserror::Error)]
     20 pub enum HeaderError {
     21     #[error("Missing header {0}")]
     22     Missing(HeaderName),
     23     #[error("Malformed header {0} expected string got binary")]
     24     NotStr(HeaderName),
     25     #[error("Malformed header {0} expected {1} got '{2}'")]
     26     Malformed(HeaderName, &'static str, Box<str>),
     27 }
     28 
     29 pub trait HeaderParser<E> {
     30     fn parse<T>(
     31         &self,
     32         name: impl Into<HeaderName>,
     33         kind: &'static str,
     34         transform: impl FnOnce(&str) -> Result<T, ()>,
     35     ) -> Result<T, E>;
     36     fn str_header(&self, name: impl Into<HeaderName>) -> Result<String, E> {
     37         self.parse(name, "string", |s| Ok(s.to_owned()))
     38     }
     39     fn int_header(&self, name: impl Into<HeaderName>) -> Result<u64, E> {
     40         self.parse(name, "integer", |s| s.parse().map_err(|_| ()))
     41     }
     42     fn bool_header(&self, name: impl Into<HeaderName>) -> Result<bool, E> {
     43         self.parse(name, "boolean", |s| s.parse().map_err(|_| ()))
     44     }
     45 }
     46 
     47 impl HeaderParser<HeaderError> for HeaderMap {
     48     fn parse<T>(
     49         &self,
     50         name: impl Into<HeaderName>,
     51         kind: &'static str,
     52         transform: impl FnOnce(&str) -> Result<T, ()>,
     53     ) -> Result<T, HeaderError> {
     54         let name = name.into();
     55         let Some(value) = self.get(&name) else {
     56             return Err(HeaderError::Missing(name));
     57         };
     58         let Ok(str) = value.to_str() else {
     59             return Err(HeaderError::NotStr(name));
     60         };
     61         transform(str).map_err(|_| HeaderError::Malformed(name, kind, str.into()))
     62     }
     63 }