268 lines
12 KiB
Java
268 lines
12 KiB
Java
/* Copyright 2017 Andrew Dawson
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*
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* This file is part of Tusky.
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*
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* Tusky is free software: you can redistribute it and/or modify it under the terms of the GNU
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* General Public License as published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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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
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* 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
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* <http://www.gnu.org/licenses/>. */
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package com.keylesspalace.tusky;
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import android.content.Context;
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import android.content.Intent;
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import android.content.SharedPreferences;
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import android.net.Uri;
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import android.os.Bundle;
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import android.support.v7.app.AppCompatActivity;
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import android.support.v7.widget.Toolbar;
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import android.view.View;
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import android.widget.Button;
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import android.widget.EditText;
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import android.widget.TextView;
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import com.android.volley.Request;
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import com.android.volley.Response;
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import com.android.volley.VolleyError;
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import com.android.volley.toolbox.JsonObjectRequest;
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import org.json.JSONException;
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import org.json.JSONObject;
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import java.io.UnsupportedEncodingException;
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import java.net.URLEncoder;
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import java.util.HashMap;
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import java.util.Map;
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public class LoginActivity extends AppCompatActivity {
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private static String OAUTH_SCOPES = "read write follow";
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private SharedPreferences preferences;
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private String domain;
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private String clientId;
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private String clientSecret;
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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
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* as the content of an HTTP request.
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*/
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private String toQueryString(Map<String, String> parameters)
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throws UnsupportedEncodingException {
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StringBuilder s = new StringBuilder();
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String between = "";
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for (Map.Entry<String, String> entry : parameters.entrySet()) {
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s.append(between);
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s.append(URLEncoder.encode(entry.getKey(), "UTF-8"));
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s.append("=");
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s.append(URLEncoder.encode(entry.getValue(), "UTF-8"));
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between = "&";
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}
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return s.toString();
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}
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/** Make sure the user-entered text is just a fully-qualified domain name. */
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private String validateDomain(String s) {
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s = s.replaceFirst("http://", "");
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s = s.replaceFirst("https://", "");
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return s;
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}
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private String getOauthRedirectUri() {
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String scheme = getString(R.string.oauth_scheme);
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String host = getString(R.string.oauth_redirect_host);
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return scheme + "://" + host + "/";
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}
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private void redirectUserToAuthorizeAndLogin() {
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/* To authorize this app and log in it's necessary to redirect to the domain given,
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* activity_login there, and the server will redirect back to the app with its response. */
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String endpoint = getString(R.string.endpoint_authorize);
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String redirectUri = getOauthRedirectUri();
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Map<String, String> parameters = new HashMap<>();
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parameters.put("client_id", clientId);
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parameters.put("redirect_uri", redirectUri);
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parameters.put("response_type", "code");
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parameters.put("scope", OAUTH_SCOPES);
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String queryParameters;
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try {
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queryParameters = toQueryString(parameters);
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} catch (UnsupportedEncodingException e) {
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//TODO: No clue how to handle this error case??
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assert(false);
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return;
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}
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String url = "https://" + domain + endpoint + "?" + queryParameters;
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Intent viewIntent = new Intent("android.intent.action.VIEW", Uri.parse(url));
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startActivity(viewIntent);
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}
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/**
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* Obtain the oauth client credentials for this app. This is only necessary the first time the
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* app is run on a given server instance. So, after the first authentication, they are
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* saved in SharedPreferences and every subsequent run they are simply fetched from there.
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*/
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private void onButtonClick(final EditText editText) {
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domain = validateDomain(editText.getText().toString());
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assert(domain != null);
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/* Attempt to get client credentials from SharedPreferences, and if not present
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* (such as in the case that the domain has never been accessed before)
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* authenticate with the server and store the received credentials to use next
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* time. */
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clientId = preferences.getString(domain + "/client_id", null);
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clientSecret = preferences.getString(domain + "/client_secret", null);
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if (clientId != null && clientSecret != null) {
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redirectUserToAuthorizeAndLogin();
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} else {
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String endpoint = getString(R.string.endpoint_apps);
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String url = "https://" + domain + endpoint;
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JSONObject parameters = new JSONObject();
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try {
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parameters.put("client_name", getString(R.string.app_name));
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parameters.put("redirect_uris", getOauthRedirectUri());
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parameters.put("scopes", OAUTH_SCOPES);
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} catch (JSONException e) {
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//TODO: error text????
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return;
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}
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JsonObjectRequest request = new JsonObjectRequest(
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Request.Method.POST, url, parameters,
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new Response.Listener<JSONObject>() {
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@Override
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public void onResponse(JSONObject response) {
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try {
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clientId = response.getString("client_id");
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clientSecret = response.getString("client_secret");
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} catch (JSONException e) {
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//TODO: Heck
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return;
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}
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SharedPreferences.Editor editor = preferences.edit();
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editor.putString(domain + "/client_id", clientId);
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editor.putString(domain + "/client_secret", clientSecret);
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editor.apply();
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redirectUserToAuthorizeAndLogin();
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}
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}, new Response.ErrorListener() {
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@Override
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public void onErrorResponse(VolleyError error) {
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editText.setError(
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"This app could not obtain authentication from that server " +
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"instance.");
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error.printStackTrace();
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}
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});
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VolleySingleton.getInstance(this).addToRequestQueue(request);
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}
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}
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_login);
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Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
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setSupportActionBar(toolbar);
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preferences = getSharedPreferences(
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getString(R.string.preferences_file_key), Context.MODE_PRIVATE);
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Button button = (Button) findViewById(R.id.button_login);
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final EditText editText = (EditText) findViewById(R.id.edit_text_domain);
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button.setOnClickListener(new View.OnClickListener() {
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@Override
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public void onClick(View v) {
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onButtonClick(editText);
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}
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});
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}
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@Override
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protected void onPause() {
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super.onPause();
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SharedPreferences.Editor editor = preferences.edit();
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editor.putString("domain", domain);
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editor.putString("clientId", clientId);
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editor.putString("clientSecret", clientSecret);
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editor.commit();
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}
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private void onLoginSuccess(String accessToken) {
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SharedPreferences.Editor editor = preferences.edit();
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editor.putString("accessToken", accessToken);
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editor.apply();
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Intent intent = new Intent(this, MainActivity.class);
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startActivity(intent);
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finish();
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}
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@Override
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protected void onResume() {
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super.onResume();
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/* Check if we are resuming during authorization by seeing if the intent contains the
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* redirect that was given to the server. If so, its response is here! */
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Uri uri = getIntent().getData();
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String redirectUri = getOauthRedirectUri();
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if (uri != null && uri.toString().startsWith(redirectUri)) {
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// This should either have returned an authorization code or an error.
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String code = uri.getQueryParameter("code");
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String error = uri.getQueryParameter("error");
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final TextView errorText = (TextView) findViewById(R.id.text_error);
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if (code != null) {
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/* During the redirect roundtrip this Activity usually dies, which wipes out the
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* instance variables, so they have to be recovered from where they were saved in
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* SharedPreferences. */
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domain = preferences.getString("domain", null);
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clientId = preferences.getString("clientId", null);
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clientSecret = preferences.getString("clientSecret", null);
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/* Since authorization has succeeded, the final step to log in is to exchange
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* the authorization code for an access token. */
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JSONObject parameters = new JSONObject();
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try {
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parameters.put("client_id", clientId);
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parameters.put("client_secret", clientSecret);
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parameters.put("redirect_uri", redirectUri);
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parameters.put("code", code);
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parameters.put("grant_type", "authorization_code");
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} catch (JSONException e) {
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errorText.setText("Heck.");
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//TODO: I don't even know how to handle this error state.
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}
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String endpoint = getString(R.string.endpoint_token);
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String url = "https://" + domain + endpoint;
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JsonObjectRequest request = new JsonObjectRequest(
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Request.Method.POST, url, parameters,
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new Response.Listener<JSONObject>() {
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@Override
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public void onResponse(JSONObject response) {
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String accessToken = "";
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try {
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accessToken = response.getString("access_token");
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} catch(JSONException e) {
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errorText.setText("Heck.");
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//TODO: I don't even know how to handle this error state.
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}
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onLoginSuccess(accessToken);
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}
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}, new Response.ErrorListener() {
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@Override
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public void onErrorResponse(VolleyError error) {
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errorText.setText(error.getMessage());
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}
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});
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VolleySingleton.getInstance(this).addToRequestQueue(request);
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} else if (error != null) {
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/* Authorization failed. Put the error response where the user can read it and they
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* can try again. */
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errorText.setText(error);
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} else {
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assert(false);
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// This case means a junk response was received somehow.
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errorText.setText("An unidentified authorization error occurred.");
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}
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}
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}
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}
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