add login with oskeychain

src-tauri/src/git.rs

@@ -1,4 +1,4 @@
-use serde::Serialize;
+use serde::{Deserialize, Serialize};
 use std::{
     collections::{BTreeMap, BTreeSet},
     ffi::{OsStr, OsString},
@@ -365,6 +365,142 @@ pub fn push(
     status_for_repo(&repo)
 }
 
+// ── Credential storage (OS keychain) ────────────────────────────────────────
+
+const CRED_SERVICE: &str = "tauri_git_lite";
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct StoredCredential {
+    pub username: String,
+    pub password: String,
+    #[serde(default, rename = "expiresAt", skip_serializing_if = "Option::is_none")]
+    pub expires_at: Option<String>,
+}
+
+fn cred_entry(key: &str) -> Result<keyring::Entry, String> {
+    let key = key.trim();
+    if key.is_empty() {
+        return Err("Kein Schlüssel für die Zugangsdaten angegeben.".to_string());
+    }
+    keyring::Entry::new(CRED_SERVICE, key)
+        .map_err(|err| format!("Schlüsselbund nicht verfügbar: {err}"))
+}
+
+/// Returns the remote URL used for auth key derivation (upstream remote of the
+/// current branch, falling back to `origin`, then the first configured remote).
+#[tauri::command]
+pub fn get_remote_url(path: String) -> Result<Option<String>, String> {
+    let repo = resolve_repo(&path)?;
+    let remote = upstream_remote_name(&repo).unwrap_or_else(|| "origin".to_string());
+
+    if let Some(url) = remote_url_for(&repo, &remote) {
+        return Ok(Some(url));
+    }
+    // origin missing → try the first configured remote
+    if let Some(first) = first_remote_name(&repo) {
+        if first != remote {
+            if let Some(url) = remote_url_for(&repo, &first) {
+                return Ok(Some(url));
+            }
+        }
+    }
+    Ok(None)
+}
+
+fn remote_url_for(repo: &Path, remote: &str) -> Option<String> {
+    let out = Command::new("git")
+        .arg("-C")
+        .arg(repo)
+        .args(["remote", "get-url", remote])
+        .output()
+        .ok()?;
+    if !out.status.success() {
+        return None;
+    }
+    let url = String::from_utf8_lossy(&out.stdout).trim().to_string();
+    if url.is_empty() {
+        None
+    } else {
+        Some(url)
+    }
+}
+
+fn upstream_remote_name(repo: &Path) -> Option<String> {
+    let branch = run_git(repo, ["rev-parse", "--abbrev-ref", "HEAD"]).ok()?;
+    let branch = String::from_utf8_lossy(&branch).trim().to_string();
+    if branch.is_empty() || branch == "HEAD" {
+        return None;
+    }
+    let out = Command::new("git")
+        .arg("-C")
+        .arg(repo)
+        .args(["config", &format!("branch.{branch}.remote")])
+        .output()
+        .ok()?;
+    if !out.status.success() {
+        return None;
+    }
+    let name = String::from_utf8_lossy(&out.stdout).trim().to_string();
+    if name.is_empty() {
+        None
+    } else {
+        Some(name)
+    }
+}
+
+fn first_remote_name(repo: &Path) -> Option<String> {
+    let out = run_git(repo, ["remote"]).ok()?;
+    String::from_utf8_lossy(&out)
+        .lines()
+        .map(str::trim)
+        .find(|line| !line.is_empty())
+        .map(str::to_string)
+}
+
+#[tauri::command]
+pub fn cred_load(key: String) -> Result<Option<StoredCredential>, String> {
+    let entry = cred_entry(&key)?;
+    match entry.get_password() {
+        Ok(json) => {
+            let cred = serde_json::from_str::<StoredCredential>(&json)
+                .map_err(|err| format!("Gespeicherte Zugangsdaten unlesbar: {err}"))?;
+            Ok(Some(cred))
+        }
+        Err(keyring::Error::NoEntry) => Ok(None),
+        Err(err) => Err(format!("Schlüsselbund-Zugriff fehlgeschlagen: {err}")),
+    }
+}
+
+#[tauri::command]
+pub fn cred_save(
+    key: String,
+    username: String,
+    password: String,
+    expires_at: Option<String>,
+) -> Result<(), String> {
+    let entry = cred_entry(&key)?;
+    let expires_at = expires_at.filter(|value| !value.trim().is_empty());
+    let cred = StoredCredential {
+        username,
+        password,
+        expires_at,
+    };
+    let json = serde_json::to_string(&cred)
+        .map_err(|err| format!("Zugangsdaten konnten nicht serialisiert werden: {err}"))?;
+    entry
+        .set_password(&json)
+        .map_err(|err| format!("Speichern im Schlüsselbund fehlgeschlagen: {err}"))
+}
+
+#[tauri::command]
+pub fn cred_delete(key: String) -> Result<(), String> {
+    let entry = cred_entry(&key)?;
+    match entry.delete_credential() {
+        Ok(()) | Err(keyring::Error::NoEntry) => Ok(()),
+        Err(err) => Err(format!("Löschen im Schlüsselbund fehlgeschlagen: {err}")),
+    }
+}
+
 #[tauri::command]
 pub fn merge_branch(path: String, branch: String) -> Result<GitStatus, String> {
     let repo = resolve_repo(&path)?;
@@ -1824,9 +1960,31 @@ where
     } else {
         "Unbekannter Fehler".to_string()
     };
+    if is_auth_error(&details) {
+        return Err(format!("AUTH_FAILED:{details}"));
+    }
     Err(format!("Git-Befehl fehlgeschlagen: {details}"))
 }
 
+/// Heuristic: did git fail because the credentials were rejected/expired,
+/// as opposed to a network or merge error? Used by the frontend to drop the
+/// stored credential and re-prompt the login.
+fn is_auth_error(details: &str) -> bool {
+    let d = details.to_lowercase();
+    d.contains("authentication failed")
+        || d.contains("could not read username")
+        || d.contains("could not read password")
+        || d.contains("invalid username or password")
+        || d.contains("terminal prompts disabled")
+        || d.contains("permission denied")
+        || d.contains("access denied")
+        || d.contains("403 forbidden")
+        || d.contains(" 403")
+        || d.contains(" 401")
+        || d.contains("authorization failed")
+        || d.contains("authentication required")
+}
+
 fn run_git_with_paths(
     repo: &Path,
     base_args: &[&str],