Tusky-App-Android/app/src/main/java/com/keylesspalace/tusky/LoginActivity.java

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/* Copyright 2017 Andrew Dawson
*
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* This file is a part of Tusky.
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*
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* This program is free software; you can redistribute it and/or modify it under the terms of the
* GNU General Public License as published by the Free Software Foundation; either version 3 of the
* License, or (at your option) any later version.
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*
* Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
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* the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
* Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with Tusky; if not,
* see <http://www.gnu.org/licenses>. */
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package com.keylesspalace.tusky;
import android.app.AlertDialog;
import android.content.ActivityNotFoundException;
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import android.content.Context;
import android.content.DialogInterface;
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import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.os.Bundle;
import android.preference.PreferenceManager;
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import android.support.annotation.NonNull;
import android.support.customtabs.CustomTabsIntent;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.text.method.LinkMovementMethod;
import android.util.Log;
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import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
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import android.widget.TextView;
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import com.keylesspalace.tusky.entity.AccessToken;
import com.keylesspalace.tusky.entity.AppCredentials;
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import com.keylesspalace.tusky.network.MastodonApi;
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import com.keylesspalace.tusky.util.CustomTabsHelper;
import com.keylesspalace.tusky.util.OkHttpUtils;
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import java.util.HashMap;
import java.util.Map;
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import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;
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public class LoginActivity extends AppCompatActivity {
private static final String TAG = "LoginActivity"; // logging tag
private static String OAUTH_SCOPES = "read write follow";
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private LinearLayout input;
private LinearLayout loading;
private EditText editText;
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private SharedPreferences preferences;
private String domain;
private String clientId;
private String clientSecret;
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@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (PreferenceManager.getDefaultSharedPreferences(this).getBoolean("lightTheme", false)) {
setTheme(R.style.AppTheme_Light);
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}
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setContentView(R.layout.activity_login);
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input = findViewById(R.id.login_input);
loading = findViewById(R.id.login_loading);
editText = findViewById(R.id.edit_text_domain);
Button button = findViewById(R.id.button_login);
TextView whatsAnInstance = findViewById(R.id.whats_an_instance);
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if (savedInstanceState != null) {
domain = savedInstanceState.getString("domain");
clientId = savedInstanceState.getString("clientId");
clientSecret = savedInstanceState.getString("clientSecret");
} else {
domain = null;
clientId = null;
clientSecret = null;
}
preferences = getSharedPreferences(
getString(R.string.preferences_file_key), Context.MODE_PRIVATE);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
onButtonClick(editText);
}
});
final Context context = this;
whatsAnInstance.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
AlertDialog dialog = new AlertDialog.Builder(context)
.setMessage(R.string.dialog_whats_an_instance)
.setPositiveButton(R.string.action_close,
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
})
.show();
TextView textView = dialog.findViewById(android.R.id.message);
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textView.setMovementMethod(LinkMovementMethod.getInstance());
}
});
}
@Override
protected void onSaveInstanceState(Bundle outState) {
outState.putString("domain", domain);
outState.putString("clientId", clientId);
outState.putString("clientSecret", clientSecret);
super.onSaveInstanceState(outState);
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}
/** Make sure the user-entered text is just a fully-qualified domain name. */
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@NonNull
private static String validateDomain(String s) {
// Strip any schemes out.
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s = s.replaceFirst("http://", "");
s = s.replaceFirst("https://", "");
// If a username was included (e.g. username@example.com), just take what's after the '@'.
int at = s.lastIndexOf('@');
if (at != -1) {
s = s.substring(at + 1);
}
return s.trim();
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}
private String getOauthRedirectUri() {
String scheme = getString(R.string.oauth_scheme);
String host = getString(R.string.oauth_redirect_host);
return scheme + "://" + host + "/";
}
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private MastodonApi getApiFor(String domain) {
Retrofit retrofit = new Retrofit.Builder()
.baseUrl("https://" + domain)
.client(OkHttpUtils.getCompatibleClient())
.addConverterFactory(GsonConverterFactory.create())
.build();
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return retrofit.create(MastodonApi.class);
}
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/**
* Obtain the oauth client credentials for this app. This is only necessary the first time the
* app is run on a given server instance. So, after the first authentication, they are
* saved in SharedPreferences and every subsequent run they are simply fetched from there.
*/
private void onButtonClick(final EditText editText) {
domain = validateDomain(editText.getText().toString());
/* Attempt to get client credentials from SharedPreferences, and if not present
* (such as in the case that the domain has never been accessed before)
* authenticate with the server and store the received credentials to use next
* time. */
String prefClientId = preferences.getString(domain + "/client_id", null);
String prefClientSecret = preferences.getString(domain + "/client_secret", null);
if (prefClientId != null && prefClientSecret != null) {
clientId = prefClientId;
clientSecret = prefClientSecret;
redirectUserToAuthorizeAndLogin(editText);
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} else {
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Callback<AppCredentials> callback = new Callback<AppCredentials>() {
@Override
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public void onResponse(Call<AppCredentials> call,
Response<AppCredentials> response) {
if (!response.isSuccessful()) {
editText.setError(getString(R.string.error_failed_app_registration));
Log.e(TAG, "App authentication failed. " + response.message());
return;
}
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AppCredentials credentials = response.body();
clientId = credentials.clientId;
clientSecret = credentials.clientSecret;
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preferences.edit()
.putString(domain + "/client_id", clientId)
.putString(domain + "/client_secret", clientSecret)
.apply();
redirectUserToAuthorizeAndLogin(editText);
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}
@Override
public void onFailure(Call<AppCredentials> call, Throwable t) {
editText.setError(getString(R.string.error_failed_app_registration));
Log.e(TAG, Log.getStackTraceString(t));
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}
};
try {
getApiFor(domain)
.authenticateApp(getString(R.string.app_name), getOauthRedirectUri(),
OAUTH_SCOPES, getString(R.string.app_website))
.enqueue(callback);
} catch (IllegalArgumentException e) {
editText.setError(getString(R.string.error_invalid_domain));
}
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}
}
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/**
* Chain together the key-value pairs into a query string, for either appending to a URL or
* as the content of an HTTP request.
*/
@NonNull
private static String toQueryString(Map<String, String> parameters) {
StringBuilder s = new StringBuilder();
String between = "";
for (Map.Entry<String, String> entry : parameters.entrySet()) {
s.append(between);
s.append(Uri.encode(entry.getKey()));
s.append("=");
s.append(Uri.encode(entry.getValue()));
between = "&";
}
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return s.toString();
}
private static boolean openInCustomTab(Uri uri, Context context) {
boolean lightTheme = PreferenceManager.getDefaultSharedPreferences(context)
.getBoolean("lightTheme", false);
int toolbarColorRes;
if (lightTheme) {
toolbarColorRes = R.color.custom_tab_toolbar_light;
} else {
toolbarColorRes = R.color.custom_tab_toolbar_dark;
}
int toolbarColor = ContextCompat.getColor(context, toolbarColorRes);
CustomTabsIntent.Builder builder = new CustomTabsIntent.Builder();
builder.setToolbarColor(toolbarColor);
CustomTabsIntent customTabsIntent = builder.build();
try {
String packageName = CustomTabsHelper.getPackageNameToUse(context);
/* If we cant find a package name, it means theres no browser that supports
* Chrome Custom Tabs installed. So, we fallback to the webview */
if (packageName == null) {
return false;
} else {
customTabsIntent.intent.setPackage(packageName);
customTabsIntent.launchUrl(context, uri);
}
} catch (ActivityNotFoundException e) {
Log.w("URLSpan", "Activity was not found for intent, " + customTabsIntent.toString());
return false;
}
return true;
}
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private void redirectUserToAuthorizeAndLogin(EditText editText) {
/* To authorize this app and log in it's necessary to redirect to the domain given,
* activity_login there, and the server will redirect back to the app with its response. */
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String endpoint = MastodonApi.ENDPOINT_AUTHORIZE;
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String redirectUri = getOauthRedirectUri();
Map<String, String> parameters = new HashMap<>();
parameters.put("client_id", clientId);
parameters.put("redirect_uri", redirectUri);
parameters.put("response_type", "code");
parameters.put("scope", OAUTH_SCOPES);
String url = "https://" + domain + endpoint + "?" + toQueryString(parameters);
Uri uri = Uri.parse(url);
if (!openInCustomTab(uri, this)) {
Intent viewIntent = new Intent(Intent.ACTION_VIEW, uri);
if (viewIntent.resolveActivity(getPackageManager()) != null) {
startActivity(viewIntent);
} else {
editText.setError(getString(R.string.error_no_web_browser_found));
}
}
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}
@Override
protected void onStop() {
super.onStop();
if (domain != null) {
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preferences.edit()
.putString("domain", domain)
.putString("clientId", clientId)
.putString("clientSecret", clientSecret)
.apply();
}
}
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@Override
protected void onStart() {
super.onStart();
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/* Check if we are resuming during authorization by seeing if the intent contains the
* redirect that was given to the server. If so, its response is here! */
Uri uri = getIntent().getData();
String redirectUri = getOauthRedirectUri();
preferences = getSharedPreferences(
getString(R.string.preferences_file_key), Context.MODE_PRIVATE);
if (preferences.getString("accessToken", null) != null
&& preferences.getString("domain", null) != null) {
// We are already logged in, go to MainActivity
Intent intent = new Intent(this, MainActivity.class);
startActivity(intent);
finish();
return;
}
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if (uri != null && uri.toString().startsWith(redirectUri)) {
// This should either have returned an authorization code or an error.
String code = uri.getQueryParameter("code");
String error = uri.getQueryParameter("error");
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if (code != null) {
/* During the redirect roundtrip this Activity usually dies, which wipes out the
* instance variables, so they have to be recovered from where they were saved in
* SharedPreferences. */
domain = preferences.getString("domain", null);
clientId = preferences.getString("clientId", null);
clientSecret = preferences.getString("clientSecret", null);
setLoading(true);
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/* Since authorization has succeeded, the final step to log in is to exchange
* the authorization code for an access token. */
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Callback<AccessToken> callback = new Callback<AccessToken>() {
@Override
public void onResponse(Call<AccessToken> call, Response<AccessToken> response) {
if (response.isSuccessful()) {
onLoginSuccess(response.body().accessToken);
} else {
setLoading(false);
editText.setError(getString(R.string.error_retrieving_oauth_token));
Log.e(TAG, String.format("%s %s",
getString(R.string.error_retrieving_oauth_token),
response.message()));
}
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}
@Override
public void onFailure(Call<AccessToken> call, Throwable t) {
setLoading(false);
editText.setError(getString(R.string.error_retrieving_oauth_token));
Log.e(TAG, String.format("%s %s",
getString(R.string.error_retrieving_oauth_token),
t.getMessage()));
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}
};
getApiFor(domain).fetchOAuthToken(clientId, clientSecret, redirectUri, code,
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"authorization_code").enqueue(callback);
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} else if (error != null) {
/* Authorization failed. Put the error response where the user can read it and they
* can try again. */
setLoading(false);
editText.setError(getString(R.string.error_authorization_denied));
Log.e(TAG, getString(R.string.error_authorization_denied) + error);
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} else {
setLoading(false);
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// This case means a junk response was received somehow.
editText.setError(getString(R.string.error_authorization_unknown));
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}
}
}
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private void setLoading(boolean loadingState) {
if (loadingState) {
loading.setVisibility(View.VISIBLE);
input.setVisibility(View.GONE);
} else {
loading.setVisibility(View.GONE);
input.setVisibility(View.VISIBLE);
}
}
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private void onLoginSuccess(String accessToken) {
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boolean committed = preferences.edit()
.putString("domain", domain)
.putString("accessToken", accessToken)
.commit();
if (!committed) {
setLoading(false);
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editText.setError(getString(R.string.error_retrieving_oauth_token));
return;
}
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Intent intent = new Intent(this, MainActivity.class);
startActivity(intent);
finish();
}
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}