Removed lazy_static in favour of OnceLock

Cargo.toml

@@ -6,7 +6,7 @@ categories = ["command-line-interface", "command-line-utilities", "cryptography"
 repository = "https://github.com/lmammino/jwtinfo"
 documentation = "https://github.com/lmammino/jwtinfo"
 readme = "README.md"
-version = "0.3.0"
+version = "0.4.0"
 authors = ["Luciano Mammino", "Stefano Abalsamo"]
 edition = "2018"
 license = "MIT"
@@ -16,7 +16,6 @@ clap = "4.3"
 base64 = "0.21"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
-lazy_static = "1.4"
 
 [lib]
 name = "jwtinfo"

src/cli.rs

@@ -5,9 +5,6 @@ use std::process;
 
 mod jwt;
 
-#[macro_use]
-extern crate lazy_static;
-
 #[doc(hidden)]
 fn main() -> io::Result<()> {
     let matches = Command::new("jwtinfo")

src/jwt.rs

@@ -33,16 +33,20 @@
 use std::error::Error;
 use std::fmt;
 use std::str;
+use std::sync::OnceLock;
 
 use base64::{
     alphabet,
     engine::{self, general_purpose},
     Engine as _,
 };
 
-lazy_static! {
-    static ref BASE64_URLSAFE: engine::GeneralPurpose =
-        engine::GeneralPurpose::new(&alphabet::URL_SAFE, general_purpose::NO_PAD);
+static BASE64_ENGINE: OnceLock<engine::GeneralPurpose> = OnceLock::new();
+
+#[inline]
+fn get_base64() -> &'static engine::GeneralPurpose {
+    BASE64_ENGINE
+        .get_or_init(|| engine::GeneralPurpose::new(&alphabet::URL_SAFE, general_purpose::NO_PAD))
 }
 
 /// Represents a JWT, composed by a header, a body and a signature
@@ -149,7 +153,7 @@ impl Error for JWTParsePartError {}
 
 #[doc(hidden)]
 fn parse_base64_string(s: &str) -> Result<String, JWTParseError> {
-    let s = BASE64_URLSAFE.decode(s)?;
+    let s = get_base64().decode(s)?;
     let s = str::from_utf8(&s)?;
     Ok(s.to_string())
 }
@@ -180,7 +184,7 @@ fn parse_body(raw_body: Option<&str>) -> Result<serde_json::Value, JWTParseError
 fn parse_signature(raw_signature: Option<&str>) -> Result<Vec<u8>, JWTParseError> {
     match raw_signature {
         None => Err(JWTParseError::MissingSection()),
-        Some(s) => Ok(BASE64_URLSAFE.decode(s)?),
+        Some(s) => Ok(get_base64().decode(s)?),
     }
 }
 

src/main.rs

@@ -42,6 +42,3 @@
 //! ```
 
 pub mod jwt;
-
-#[macro_use]
-extern crate lazy_static;