Working SFDX Auth URL and Client Credentials

src/error.rs

@@ -0,0 +1,42 @@
+/// Error type returned by Salesforce authentication operations.
+///
+/// # Examples
+///
+/// ```rust
+/// use rustsf_auth::{parse_sfdx_url, SalesforceAuthError};
+///
+/// let error = parse_sfdx_url("not-a-valid-sfdx-url").unwrap_err();
+/// assert!(matches!(error, SalesforceAuthError::InvalidSfdxUrl));
+/// ```
+
+#[derive(Debug, thiserror::Error)]
+pub enum SalesforceAuthError {
+	#[error("missing required configuration field: {0}")]
+	MissingRequiredField(&'static str),
+
+	/// The SFDX URL did not match the required format.
+	#[error("invalid SFDX URL")]
+	InvalidSfdxUrl,
+
+	/// A URL failed to parse.
+	#[error("invalid URL `{url}`: {source}")]
+	InvalidUrl {
+		/// The URL string that failed to parse.
+		url: String,
+
+		/// The underlying URL parser error.
+		source: url::ParseError,
+	},
+
+	/// Error returned by the `oauth2` crate.
+	#[error("OAuth2 error: {0}")]
+	OAuth2(String),
+
+	/// HTTP error returned by `reqwest`.
+	#[error("HTTP error: {0}")]
+	Http(#[from] reqwest::Error),
+
+	/// Error creating a Salesforce JWT assertion.
+	#[error("JWT error: {0}")]
+	Jwt(String),
+}