WIP

6 files changed, 574 insertions, 0 deletions

diff --git a/src/org/slcl/Directory.java b/src/org/slcl/Directory.java
new file mode 100644
index 0000000..495a3f5
--- /dev/null
+++ b/src/org/slcl/Directory.java
@@ -0,0 +1,48 @@
+/*
+ * slcl-android, an Android frontend for slcl
+ * Copyright (C) 2023-2024  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package org.slcl;
+
+import java.net.URLEncoder;
+import java.io.IOException;
+import android.app.Activity;
+import android.app.ProgressDialog;
+import android.content.Intent;
+import android.os.AsyncTask;
+import android.os.Bundle;
+import android.text.Editable;
+import android.view.View;
+import android.widget.Button;
+import android.widget.CheckBox;
+import android.widget.EditText;
+import android.widget.TextView;
+
+public class Directory extends Activity {
+    public static final String EXTRA_ID = "cookie";
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_directory);
+
+        final Intent intent = getIntent();
+        final String cookie = intent.getStringExtra(EXTRA_ID);
+
+        System.out.println(cookie);
+    }
+}
diff --git a/src/org/slcl/InternalFile.java b/src/org/slcl/InternalFile.java
new file mode 100644
index 0000000..db41576
--- /dev/null
+++ b/src/org/slcl/InternalFile.java
@@ -0,0 +1,38 @@
+/*
+ * slcl-android, an Android frontend for slcl
+ * Copyright (C) 2023-2024  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package org.slcl;
+
+import java.io.File;
+import android.content.Context;
+
+final public class InternalFile {
+    final File f;
+
+    InternalFile(final Context c, final String path)
+    {
+        final File dir = c.getFilesDir();
+
+        f = new File(dir, path);
+    }
+
+    public File getFile()
+    {
+        return f;
+    }
+}
diff --git a/src/org/slcl/LoginActivity.java b/src/org/slcl/LoginActivity.java
new file mode 100644
index 0000000..79e2ed4
--- /dev/null
+++ b/src/org/slcl/LoginActivity.java
@@ -0,0 +1,146 @@
+/*
+ * slcl-android, an Android frontend for slcl
+ * Copyright (C) 2023-2024  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package org.slcl;
+
+import org.slcl.core.Cookie;
+import org.slcl.core.Login;
+import org.slcl.Directory;
+import org.slcl.InternalFile;
+import java.net.URLEncoder;
+import java.io.IOException;
+import android.app.Activity;
+import android.app.ProgressDialog;
+import android.content.Context;
+import android.content.Intent;
+import android.os.AsyncTask;
+import android.os.Bundle;
+import android.text.Editable;
+import android.view.View;
+import android.widget.Button;
+import android.widget.CheckBox;
+import android.widget.EditText;
+import android.widget.TextView;
+
+public final class LoginActivity extends Activity {
+
+    private class LoginParams {
+        public LoginParams(final boolean https, String url,
+            final String username, final String password)
+        {
+            this.https = https;
+            this.username = username;
+            this.url = url;
+            this.password = password;
+        }
+
+        final boolean https;
+        final String url, username, password;
+    }
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState)
+    {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_login);
+
+        Button button = (Button)findViewById(R.id.button);
+
+        button.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                final EditText url = (EditText)findViewById(R.id.url);
+                final EditText username = (EditText)findViewById(R.id.username);
+                final EditText password = (EditText)findViewById(R.id.password);
+                final CheckBox https = (CheckBox)findViewById(R.id.https);
+
+                url.setText("192.168.1.180:50683");
+                username.setText("a");
+                password.setText("a");
+                https.setChecked(false);
+
+                try {
+                    final String urlstr = url.getText().toString();
+                    final String encusername = URLEncoder.encode(
+                        username.getText().toString(), "UTF-8");
+                    final String encpassword = URLEncoder.encode(
+                        password.getText().toString(), "UTF-8");
+
+                    final LoginTask t = new LoginTask();
+                    LoginParams p = new LoginParams(https.isChecked(),
+                        urlstr, encusername, encpassword);
+
+                    t.execute(p);
+                }
+                catch (final IOException e) {
+                    //error.setText("Exception: " + e.getMessage());
+                }
+            }
+        });
+    }
+
+    // https://stackoverflow.com/questions/6053602/what-arguments-are-passed-into-asynctaskarg1-arg2-arg3
+    private final class LoginTask
+        extends AsyncTask<LoginParams, String, String>
+    {
+        ProgressDialog dialog;
+
+        @Override
+        protected void onPreExecute()
+        {
+            dialog = dialog.show(LoginActivity.this, "ProgressDialog",
+                "Logging into server");
+        }
+
+        @Override
+        protected String doInBackground(final LoginParams... params)
+        {
+            try {
+                final LoginParams p = params[0];
+                final Login l = new Login();
+                final String cookie = l.login(p.https, p.url, p.username,
+                    p.password);
+                final InternalFile f = new InternalFile(
+                        getApplicationContext(), "login");
+                final Cookie c = new Cookie(p.username, cookie);
+
+                c.store(f.getFile());
+                return "";
+            } catch (final IOException e) {
+                System.out.println(e.getMessage());
+                return e.getMessage();
+            }
+        }
+
+        @Override
+        protected void onProgressUpdate(final String... text)
+        {
+        }
+
+        @Override
+        protected void onPostExecute(final String result)
+        {
+            Intent intent = new Intent(LoginActivity.this, Directory.class);
+
+            dialog.dismiss();
+            startActivity(intent);
+            // TODO: review errors.
+            //error.setText("Exception: " + e.getMessage());
+        }
+    }
+}
diff --git a/src/org/slcl/Main.java b/src/org/slcl/Main.java
new file mode 100644
index 0000000..8ac8c55
--- /dev/null
+++ b/src/org/slcl/Main.java
@@ -0,0 +1,93 @@
+/*
+ * slcl-android, an Android frontend for slcl
+ * Copyright (C) 2023-2024  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package org.slcl;
+
+import org.slcl.LoginActivity;
+import org.slcl.Directory;
+import org.slcl.core.Cookie;
+import java.io.IOException;
+import android.app.Activity;
+import android.app.ProgressDialog;
+import android.content.Context;
+import android.content.Intent;
+import android.os.AsyncTask;
+import android.os.Bundle;
+import android.text.Editable;
+import android.view.View;
+
+public final class Main extends Activity {
+    @Override
+    protected void onCreate(Bundle savedInstanceState)
+    {
+        final LoadTask t = new LoadTask();
+
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        t.execute();
+    }
+
+    private final class LoadTask extends AsyncTask<String, String, Cookie>
+    {
+        ProgressDialog dialog;
+
+        @Override
+        protected void onPreExecute()
+        {
+            dialog = dialog.show(Main.this, "ProgressDialog",
+                "Retrieving credentials");
+        }
+
+        @Override
+        protected Cookie doInBackground(final String... args)
+        {
+            try {
+                final InternalFile f = new InternalFile(
+                    getApplicationContext(), "login");
+                final Cookie c = new Cookie(f.getFile());
+
+                return c;
+            } catch (final IOException e) {
+                System.out.println(e.getMessage());
+                return null;
+            }
+        }
+
+        @Override
+        protected void onProgressUpdate(final String... params)
+        {
+        }
+
+        @Override
+        protected void onPostExecute(final Cookie cookie)
+        {
+            final Intent intent;
+
+            if (cookie == null) {
+                intent = new Intent(Main.this, LoginActivity.class);
+            } else {
+                intent = new Intent(Main.this, Directory.class);
+                // TODO: split cookie with ';' (expiration date, etc.).
+                intent.putExtra(Directory.EXTRA_ID, cookie.getCookie());
+            }
+
+            dialog.dismiss();
+            startActivity(intent);
+        }
+    }
+}
diff --git a/src/org/slcl/core/Cookie.java b/src/org/slcl/core/Cookie.java
new file mode 100644
index 0000000..86f64b5
--- /dev/null
+++ b/src/org/slcl/core/Cookie.java
@@ -0,0 +1,156 @@
+/*
+ * slcl-android, an Android frontend for slcl
+ * Copyright (C) 2023-2024  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package org.slcl.core;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.InputStreamReader;
+import java.io.IOException;
+import java.text.ParsePosition;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.List;
+
+public final class Cookie {
+    final String username, cookie;
+    final CookieDate date;
+
+    private final class Results {
+        final String username, cookie;
+        final CookieDate date;
+
+        Results(String username, String cookie, final CookieDate date)
+        {
+            this.username = username;
+            this.cookie = cookie;
+            this.date = date;
+        }
+    }
+
+    public Cookie(final File f)
+        throws IOException {
+        final FileInputStream fis = new FileInputStream(f);
+        final InputStreamReader ir = new InputStreamReader(fis);
+        final BufferedReader r = new BufferedReader(ir);
+        final Results res = from_data(null, r.readLine());
+
+        username = res.username;
+        cookie = res.cookie;
+        date = res.date;
+        fis.close();
+    }
+
+    private final class CookieDate {
+        final private String FMT = "EEE, dd MMM yyyy hh:mm:ss z";
+        Date date;
+
+        public CookieDate(final String[] tokens) throws IOException
+        {
+            for (int i = 1; i < tokens.length; i++) {
+                final String[] date_tokens = tokens[i].split("=");
+
+                if (date_tokens.length != 2) {
+                    continue;
+                }
+
+                final String header = date_tokens[0].trim();
+
+                if (!header.equalsIgnoreCase("Expires")) {
+                    continue;
+                }
+
+                ParsePosition pos = new ParsePosition(0);
+                final SimpleDateFormat fmt = new SimpleDateFormat(FMT);
+                final Date d = fmt.parse(date_tokens[1], pos);
+
+                if (d != null) {
+                    // TODO: check pos.
+                    date = d;
+                    return;
+                }
+            }
+
+            throw new IOException("missing expiration date");
+        }
+
+        public String toString()
+        {
+            final SimpleDateFormat fmt = new SimpleDateFormat(FMT);
+
+            return fmt.format(date, null, null).toString();
+        }
+
+        public Date getDate() {
+            return date;
+        }
+    }
+
+    private Results from_data(final String exp_username, final String data)
+        throws IOException
+    {
+        final int sep = data.indexOf('=');
+
+        if (sep <= 0) {
+            throw new IOException("expected key=value format");
+        }
+
+        final String username = data.substring(0, sep);
+
+        if (exp_username != null
+            && !username.equals(exp_username)) {
+            throw new IOException("wrong username");
+        }
+
+        final String[] tokens = data.substring(sep + 1).split(";");
+
+        if (tokens.length < 2) {
+            throw new IOException("expected at least two tokens");
+        }
+
+        return new Results(username, tokens[0], new CookieDate(tokens));
+    }
+
+    public Cookie(final String exp_username, final String data)
+        throws IOException
+    {
+        final Results r = from_data(exp_username, data);
+
+        username = r.username;
+        cookie = r.cookie;
+        date = r.date;
+    }
+
+    public void store(final File f) throws IOException
+    {
+        final FileOutputStream fos = new FileOutputStream(f);
+        final String datestr = "Expires=" + date.toString();
+
+        fos.write(cookie.getBytes());
+        fos.write(';');
+        fos.write(datestr.getBytes());
+        fos.write('\n');
+        fos.close();
+    }
+
+    public String getCookie() {
+        return cookie;
+    }
+}
diff --git a/src/org/slcl/core/Login.java b/src/org/slcl/core/Login.java
new file mode 100644
index 0000000..d5b9267
--- /dev/null
+++ b/src/org/slcl/core/Login.java
@@ -0,0 +1,93 @@
+/*
+ * slcl-android, an Android frontend for slcl
+ * Copyright (C) 2023-2024  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package org.slcl.core;
+
+import java.io.OutputStream;
+import java.io.IOException;
+import java.net.URL;
+import java.net.URLConnection;
+import java.net.HttpURLConnection;
+import java.util.List;
+import java.util.Map;
+import javax.net.ssl.HttpsURLConnection;
+
+public final class Login {
+    public String login(final boolean https, String url, final String username,
+        final String password) throws IOException {
+
+        if (!url.startsWith("https://") && https) {
+            url = "https://" + url;
+        }
+        else if (!url.startsWith("http://")) {
+            url = "http://" + url;
+        }
+
+        url += "/login";
+
+        final String data = "username=" + username + "&password=" + password;
+
+        URL u = new URL(url);
+        HttpURLConnection c;
+
+        if (https) {
+            c = (HttpsURLConnection)u.openConnection();
+        }
+        else {
+            c = (HttpURLConnection)u.openConnection();
+        }
+
+        c.setRequestMethod("POST");
+        c.setInstanceFollowRedirects(false);
+        c.setReadTimeout(5000);
+
+        OutputStream os = c.getOutputStream();
+
+        os.write(data.getBytes());
+
+        final int code = c.getResponseCode();
+
+        switch (code)
+        {
+            case HttpURLConnection.HTTP_FORBIDDEN:
+                throw new IOException("Forbidden");
+
+            case HttpURLConnection.HTTP_UNAUTHORIZED:
+                throw new IOException("Unauthorized");
+
+            case HttpURLConnection.HTTP_SEE_OTHER:
+            {
+                final Map<String,List<String>> headers = c.getHeaderFields();
+                final List<String> cookies = headers.get("Set-Cookie");
+
+                if (cookies != null) {
+                    if (cookies.size() != 1) {
+                        throw new IOException("Expected only 1 cookie");
+                    }
+
+                    return cookies.toArray(new String[0])[0];
+                } else {
+                    throw new IOException("No Cookie found");
+                }
+            }
+
+            default:
+                throw new IOException("Unexpected HTTP status " + code);
+        }
+    }
+}