add support for thiserror

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "altcha-lib-rs"
-version = "0.1.2"
+version = "0.1.3"
 edition = "2021"
 authors = ["jmic <jmic@users.noreply.github.com>"]
 description = "Community implementation of the Altcha library in Rust for your own server application to create and validate challenges and responses."
@@ -25,6 +25,7 @@ sha1 = "0"
 hmac = "0"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = { version = "1.0", optional = true }
+thiserror = "2.0.12"
 
 [features]
 default = []
@@ -32,4 +33,4 @@ json = ["serde_json"]
 
 [dev-dependencies]
 actix-web = "4"
-base64 = "0.22"
+base64 = "0.22"

src/error.rs

@@ -1,15 +1,25 @@
-#[derive(Debug)]
+#[derive(Debug, thiserror::Error)]
 pub enum Error {
     #[cfg(feature = "json")]
+    #[error("JSON parsing error: {0}")]
     ParseJson(serde_json::Error),
+    #[error("Integer parsing error: {0}")]
     ParseInteger(std::num::ParseIntError),
+    #[error("Expiration parsing error: {0}")]
     ParseExpire(String),
+    #[error("Solution expired: {0}")]
     VerificationFailedExpired(String),
+    #[error("Solution does not match the challenge: {0}")]
     VerificationMismatchChallenge(String),
+    #[error("Signature in the solution does not match the challenge: {0}")]
     VerificationMismatchSignature(String),
+    #[error("Max number reached: {0}")]
     SolveChallengeMaxNumberReached(String),
+    #[error("Wrong challenge input: {0}")]
     WrongChallengeInput(String),
+    #[error("Altcha error: {0}")]
     General(String),
+    #[error("Error in the randomizer: {0}")]
     RandError(rand::distr::uniform::Error),
 }