client: add TlsOptions::parse_fingerprint

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

proxmox-client/Cargo.toml

@@ -11,6 +11,7 @@ repository.workspace = true
 [dependencies]
 anyhow.workspace = true
 base64.workspace = true
+hex.workspace = true
 http.workspace = true
 once_cell.workspace = true
 percent-encoding.workspace = true

proxmox-client/src/client.rs

@@ -17,6 +17,7 @@ use proxmox_login::ticket::Validity;
 use proxmox_login::{Login, SecondFactorChallenge, TicketResult};
 
 use crate::auth::AuthenticationKind;
+use crate::error::ParseFingerprintError;
 use crate::{Error, Token};
 
 use super::{HttpApiClient, HttpApiResponse};
@@ -40,6 +41,23 @@ pub enum TlsOptions {
     Callback(Box<dyn Fn(bool, &mut x509::X509StoreContextRef) -> bool + Send + Sync + 'static>),
 }
 
+impl TlsOptions {
+    pub fn parse_fingerprint(fp: &str) -> Result<Self, ParseFingerprintError> {
+        use hex::FromHex;
+
+        let hex: Vec<u8> = fp
+            .as_bytes()
+            .iter()
+            .copied()
+            .filter(|&b| b != b':')
+            .collect();
+
+        let fp = <[u8; 32]>::from_hex(&hex).map_err(|_| ParseFingerprintError)?;
+
+        Ok(Self::Fingerprint(fp.into()))
+    }
+}
+
 /// A Proxmox API client base backed by a [`proxmox_http::Client`].
 pub struct Client {
     api_url: Uri,

proxmox-client/src/error.rs

@@ -85,3 +85,14 @@ impl Error {
         Self::Api(status, msg.into())
     }
 }
+
+#[derive(Clone, Copy, Debug)]
+pub struct ParseFingerprintError;
+
+impl StdError for ParseFingerprintError {}
+
+impl fmt::Display for ParseFingerprintError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.write_str("failed to parse fingerprint")
+    }
+}