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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,199 @@ | ||
| use std::fmt::{self, Display}; | ||
|
|
||
| use bech32::primitives::decode::CheckedHrpstring; | ||
| use bech32::Bech32m; | ||
| use error_stack::{bail, ensure, Report, ResultExt}; | ||
| use regex::Regex; | ||
|
|
||
| use super::Error; | ||
|
|
||
| #[derive(Debug)] | ||
| pub struct Bech32mFormat { | ||
| pub encoded: String, | ||
| } | ||
|
|
||
| impl Bech32mFormat { | ||
| pub fn new(encoded: String) -> Self { | ||
| Self { encoded } | ||
| } | ||
|
|
||
| pub fn from_str(prefix: &str, length: usize, message_id: &str) -> Result<Self, Report<Error>> { | ||
| // The Bech32m prefix should be between 1 and 83 characters | ||
| ensure!( | ||
| !prefix.is_empty() && prefix.len() <= 83, | ||
| Error::InvalidBech32mLocalChecks("Prefix size should be between 1 and 83".to_string()) | ||
| ); | ||
|
|
||
| let data_part_length = length.saturating_sub(prefix.len()).saturating_sub(1); | ||
| ensure!( | ||
| data_part_length >= 6, | ||
| Error::InvalidBech32mLocalChecks( | ||
| "The data part should be at least 6 characters long".to_string() | ||
| ) | ||
| ); | ||
|
|
||
| ensure!( | ||
| prefix.chars().all(|c| { | ||
| c.is_alphanumeric() | ||
| }), | ||
| Error::InvalidBech32mLocalChecks( | ||
| "The prefix should contain only Bech32m valid characters".to_string() | ||
| ) | ||
| ); | ||
|
|
||
| let pattern = format!("^({prefix}1[02-9ac-hj-np-z]{{{data_part_length}}})$"); | ||
|
|
||
| let regex = Regex::new(pattern.as_str()).change_context( | ||
| Error::InvalidBech32mLocalChecks("Failed to create regex".to_string()), | ||
| )?; | ||
|
|
||
| let (_, [string]) = regex | ||
| .captures(message_id) | ||
| .ok_or(Error::InvalidMessageID { | ||
| id: message_id.to_string(), | ||
| expected_format: format!("Bech32m with '{}' prefix", prefix), | ||
| })? | ||
| .extract(); | ||
|
|
||
| verify_bech32m(string, prefix)?; | ||
|
|
||
| Ok(Self { | ||
| encoded: string.to_string(), | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| impl Display for Bech32mFormat { | ||
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | ||
| write!(f, "{}", self.encoded) | ||
| } | ||
| } | ||
|
|
||
| fn verify_bech32m(input: &str, expected_prefix: &str) -> Result<(), Report<Error>> { | ||
| let checked_bech32m = CheckedHrpstring::new::<Bech32m>(input) | ||
| .change_context(Error::InvalidBech32mExternalChecks(input.to_string()))?; | ||
|
|
||
| ensure!( | ||
| checked_bech32m.hrp().as_str() == expected_prefix, | ||
| Error::InvalidBech32mExternalChecks(format!( | ||
| "Expected prefix '{expected_prefix}' not found: '{input}'" | ||
| )) | ||
| ); | ||
|
|
||
| if checked_bech32m.data_part_ascii_no_checksum().is_empty() { | ||
| bail!(Error::InvalidBech32mExternalChecks(format!( | ||
| "Message Id is missing the data part: '{input}'" | ||
| ))); | ||
| } | ||
|
|
||
| Ok(()) | ||
| } | ||
|
|
||
| #[cfg(test)] | ||
| mod test { | ||
| use bech32::Hrp; | ||
| use rand::Rng; | ||
|
|
||
| use crate::assert_err_contains; | ||
|
|
||
| use super::*; | ||
|
|
||
| #[test] | ||
| fn should_pass_bech32m() { | ||
| let mut rng = rand::thread_rng(); | ||
|
|
||
| const CHARS: [char; 32] = [ | ||
| 'q', 'p', 'z', 'r', 'y', '9', 'x', '8', 'g', 'f', '2', 't', 'v', 'd', 'w', '0', 's', | ||
| '3', 'j', 'n', '5', '4', 'k', 'h', 'c', 'e', '6', 'm', 'u', 'a', '7', 'l', | ||
| ]; | ||
| let char_set = CHARS.len(); | ||
|
|
||
| for _ in 0..100 { | ||
| let hrp_str = (0..rng.gen_range(1..=83)) | ||
| .map(|_| CHARS[rng.gen_range(0..char_set)]) | ||
| .collect::<String>(); | ||
|
|
||
| let data = (0..80) | ||
| .map(|_| char::from(rng.gen_range(32..=126))) | ||
| .collect::<String>(); | ||
|
|
||
| let hrp = Hrp::parse(hrp_str.as_str()).expect("valid hrp"); | ||
| let string = | ||
| bech32::encode::<Bech32m>(hrp, data.as_bytes()).expect("failed to encode string"); | ||
|
|
||
| assert!(Bech32mFormat::from_str(hrp.as_str(), string.len(), string.as_str()).is_ok()); | ||
| } | ||
| } | ||
|
|
||
| #[test] | ||
| fn should_pass_edge_cases() { | ||
| let mut rng = rand::thread_rng(); | ||
| let data = (0..80) | ||
| .map(|_| char::from(rng.gen_range(32..=126))) | ||
| .collect::<String>(); | ||
|
|
||
| // Minimum prefix length | ||
| let hrp_str = "a"; | ||
| let hrp = Hrp::parse(hrp_str).expect("valid hrp"); | ||
| let string = | ||
| bech32::encode::<Bech32m>(hrp, data.as_bytes()).expect("failed to encode string"); | ||
|
|
||
| assert!(Bech32mFormat::from_str(hrp.as_str(), string.len(), string.as_str()).is_ok()); | ||
|
|
||
| // Maximum prefix length | ||
| let hrp_string = "a".repeat(83); | ||
| let hrp = Hrp::parse(hrp_string.as_str()).expect("valid hrp"); | ||
| let string = | ||
| bech32::encode::<Bech32m>(hrp, data.as_bytes()).expect("failed to encode string"); | ||
| assert!(Bech32mFormat::from_str(hrp.as_str(), string.len(), string.as_str()).is_ok()); | ||
| } | ||
|
|
||
| #[test] | ||
| fn should_fail_with_invalid_message_id() { | ||
| let string = "at1hs0xk375g4kvw53rcem9nyjsdw5lsv94fl065n77cpt0774nsyysdecaju"; | ||
| let hrp = "at"; | ||
|
|
||
| assert_err_contains!( | ||
| Bech32mFormat::from_str(hrp, string.len() + 1, string), | ||
| Error, | ||
| Error::InvalidMessageID { .. } | ||
| ); | ||
|
|
||
| assert_err_contains!( | ||
| Bech32mFormat::from_str(hrp, string.len() - 1, string), | ||
| Error, | ||
| Error::InvalidMessageID { .. } | ||
| ); | ||
|
|
||
| assert_err_contains!( | ||
| Bech32mFormat::from_str("au", string.len(), string), | ||
| Error, | ||
| Error::InvalidMessageID { .. } | ||
| ); | ||
| } | ||
|
|
||
| #[test] | ||
| fn should_not_pass_empty_data_part() { | ||
| let hrp_string = "a"; | ||
| let hrp = Hrp::parse(hrp_string).expect("valid hrp"); | ||
| let string = "a1"; | ||
| assert_err_contains!( | ||
| Bech32mFormat::from_str(hrp.as_str(), string.len(), string), | ||
| Error, | ||
| Error::InvalidBech32mLocalChecks(..) | ||
| ); | ||
|
|
||
| // Minimum data part length | ||
| let data = ""; | ||
| let hrp_string = "a"; | ||
| let hrp = Hrp::parse(hrp_string).expect("valid hrp"); | ||
| let string = | ||
| bech32::encode::<Bech32m>(hrp, data.as_bytes()).expect("failed to encode string"); | ||
|
|
||
| assert_err_contains!( | ||
| Bech32mFormat::from_str(hrp.as_str(), string.len(), string.as_str()), | ||
| Error, | ||
| Error::InvalidBech32mExternalChecks(..) | ||
| ); | ||
| } | ||
| } |
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