Add LAN discovery and instance picker

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 106 insertions, 0 deletions

diff --git a/app/src/main/java/mygram/droid/SetupActivity.java b/app/src/main/java/mygram/droid/SetupActivity.java
index ef1f68c..106ec9c 100644
--- a/app/src/main/java/mygram/droid/SetupActivity.java
+++ b/app/src/main/java/mygram/droid/SetupActivity.java
@@ -15,6 +15,112 @@
 package mygram.droid;
 
 import android.app.Activity;
+import android.content.Intent;
+import android.os.Bundle;
+import android.text.InputType;
+import android.widget.EditText;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+import android.widget.Toast;
 
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+/** Instance picker: LAN scan, manual URL, then the password when the instance asks for one. */
 public final class SetupActivity extends Activity {
+	private LinearLayout box;
+
+	@Override
+	protected void onCreate(Bundle state) {
+		super.onCreate(state);
+		box = Ui.column(this);
+		setContentView(box);
+		scan();
+	}
+
+	private void scan() {
+		reset("Searching the network for Foldergram…");
+		Api.async(() -> {
+			Map<String, String> found = new LinkedHashMap<>();
+			String self = Discovery.localIpv4(this);
+			if (self != null)
+				for (String base : Discovery.scan(self))
+					found.put(base, Discovery.label(base));
+			return found;
+		}, this::found, e -> {
+			reset("Scan failed: " + e.getMessage());
+			actions();
+		});
+	}
+
+	private void found(Map<String, String> instances) {
+		reset(instances.isEmpty() ? "No Foldergram found on port " + Discovery.PORT : "Choose an instance");
+		for (Map.Entry<String, String> e : instances.entrySet()) {
+			TextView t = Ui.text(this, e.getValue(), 20);
+			int p = Ui.dp(this, 12);
+			t.setPadding(p * 2, p, p * 2, p);
+			Ui.focusable(t);
+			t.setOnClickListener(v -> choose(e.getKey()));
+			box.addView(t);
+		}
+		actions();
+		box.getChildAt(1).requestFocus();
+	}
+
+	private void actions() {
+		LinearLayout row = Ui.row(this);
+		row.addView(Ui.iconButton(this, R.drawable.ic_refresh, "Rescan", v -> scan()));
+		row.addView(Ui.iconButton(this, R.drawable.ic_edit, "Enter URL", v -> manual()));
+		box.addView(row);
+	}
+
+	private void manual() {
+		reset("Instance URL");
+		EditText url = Ui.field(this, "http://host:" + Discovery.PORT,
+				InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_URI);
+		box.addView(url);
+		box.addView(Ui.iconButton(this, R.drawable.ic_check, "Connect",
+				v -> choose(Api.normalize(url.getText().toString()))));
+		url.requestFocus();
+	}
+
+	private void choose(String base) {
+		reset("Connecting to " + base + "…");
+		Api.async(() -> Api.authStatus(base), status -> {
+			if ("public".equals(status.optString("accessMode")))
+				save(base, "");
+			else
+				password(base);
+		}, e -> {
+			reset("Cannot reach " + base + ": " + e.getMessage());
+			actions();
+		});
+	}
+
+	private void password(String base) {
+		reset("Viewer password for " + base);
+		EditText pw = Ui.field(this, "Password", Ui.password());
+		box.addView(pw);
+		box.addView(Ui.iconButton(this, R.drawable.ic_check, "Log in", v -> {
+			String s = pw.getText().toString();
+			Api.async(() -> {
+				Api.login(base, s);
+				return true;
+			}, ok -> save(base, s), e -> Toast.makeText(this,
+					e instanceof Api.HttpError && ((Api.HttpError) e).code == 401 ? "Wrong password" : e.getMessage(),
+					Toast.LENGTH_LONG).show());
+		}));
+		pw.requestFocus();
+	}
+
+	private void save(String base, String password) {
+		Prefs.setServer(base, password);
+		startActivity(new Intent(this, MainActivity.class)
+				.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK));
+	}
+
+	private void reset(String title) {
+		box.removeAllViews();
+		box.addView(Ui.text(this, title, 24));
+	}
 }