From a84c964b725ad2012cdf6a605ff264c60e0b0e59 Mon Sep 17 00:00:00 2001
From: mrw1593 <botahamec@outlook.com>
Date: Mon, 29 May 2023 15:55:51 -0400
Subject: Create service for parsing Basic Authorization

---
 src/services/authorization.rs | 50 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 src/services/authorization.rs

(limited to 'src/services/authorization.rs')

diff --git a/src/services/authorization.rs b/src/services/authorization.rs
new file mode 100644
index 0000000..b9d57ae
--- /dev/null
+++ b/src/services/authorization.rs
@@ -0,0 +1,50 @@
+use base64::Engine;
+use raise::yeet;
+use thiserror::Error;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Error)]
+pub enum ParseBasicError {
+	#[error("Basic Authorization is required")]
+	NotBasic,
+	#[error("No credentials were provided for authorization")]
+	NoCredentials,
+	#[error("The credentials provided were not base64")]
+	InvalidBase64,
+	#[error("The decoded base64 credentials were not UTF-8")]
+	NotUtf8,
+	#[error("A colon (:) must be used to delimit the username and password")]
+	NoColon,
+}
+
+/// Returns a username and a password from a Basic authorization header
+pub fn parse_basic(value: &str) -> Result<(Box<str>, Box<str>), ParseBasicError> {
+	if !value.starts_with("Basic") {
+		yeet!(ParseBasicError::NotBasic);
+	}
+
+	let value: String = value
+		.chars()
+		.skip(5)
+		.skip_while(|ch| ch.is_whitespace())
+		.collect();
+
+	if value.is_empty() {
+		yeet!(ParseBasicError::NoCredentials);
+	}
+
+	let Ok(bytes) = base64::engine::general_purpose::STANDARD.decode(value) else {
+		yeet!(ParseBasicError::InvalidBase64)
+	};
+
+	let Ok(value) = String::from_utf8(bytes) else {
+		yeet!(ParseBasicError::NotUtf8)
+	};
+
+	let mut parts = value.split(':');
+	let username = parts.next().unwrap();
+	let Some(password) = parts.next() else {
+		yeet!(ParseBasicError::NoColon)
+	};
+
+	Ok((Box::from(username), Box::from(password)))
+}
-- 
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