Rework LockScreen auth logic

Modules/LockScreen/LockContext.qml

@@ -0,0 +1,92 @@
+import QtQuick
+import Quickshell
+import Quickshell.Services.Pam
+
+Scope {
+    id: root
+    signal unlocked()
+    signal failed()
+
+    property string currentText: ""
+    property bool unlockInProgress: false
+    property bool showFailure: false
+    property string errorMessage: ""
+    property bool pamAvailable: typeof PamContext !== "undefined"
+
+    onCurrentTextChanged: {
+        if (currentText !== "") {
+            showFailure = false;
+            errorMessage = "";
+        }
+    }
+
+    function tryUnlock() {
+        if (!pamAvailable) {
+            errorMessage = "PAM not available";
+            showFailure = true;
+            return;
+        }
+
+        if (currentText === "") {
+            errorMessage = "Password required";
+            showFailure = true;
+            return;
+        }
+
+        root.unlockInProgress = true;
+        errorMessage = "";
+        showFailure = false;
+        
+        console.log("Starting PAM authentication for user:", pam.user);
+        pam.start();
+    }
+
+    PamContext {
+        id: pam
+        config: "login"
+        user: Quickshell.env("USER")
+
+        onPamMessage: {
+            console.log("PAM message:", message, "isError:", messageIsError, "responseRequired:", responseRequired);
+            
+            if (messageIsError) {
+                errorMessage = message;
+            }
+            
+            if (responseRequired) {
+                console.log("Responding to PAM with password");
+                respond(root.currentText);
+            }
+        }
+
+        onResponseRequiredChanged: {
+            console.log("Response required changed:", responseRequired);
+            if (responseRequired && root.unlockInProgress) {
+                console.log("Automatically responding to PAM");
+                respond(root.currentText);
+            }
+        }
+
+        onCompleted: {
+            console.log("PAM completed with result:", result);
+            if (result === PamResult.Success) {
+                console.log("Authentication successful");
+                root.unlocked();
+            } else {
+                console.log("Authentication failed");
+                errorMessage = "Authentication failed";
+                showFailure = true;
+                root.failed();
+            }
+            root.unlockInProgress = false;
+        }
+
+        onError: {
+            console.log("PAM error:", error, "message:", message);
+            errorMessage = message || "Authentication error";
+            showFailure = true;
+            root.unlockInProgress = false;
+            root.failed();
+        }
+    }
+}