1package eu.siacs.conversations.services;
2
3import android.Manifest;
4import android.content.Context;
5import android.content.pm.PackageManager;
6import android.os.Build;
7import android.os.PowerManager;
8import android.os.SystemClock;
9import android.util.Log;
10import android.util.Pair;
11
12import org.bouncycastle.crypto.engines.AESEngine;
13import org.bouncycastle.crypto.modes.AEADBlockCipher;
14import org.bouncycastle.crypto.modes.GCMBlockCipher;
15import org.bouncycastle.crypto.params.AEADParameters;
16import org.bouncycastle.crypto.params.KeyParameter;
17
18import java.io.FileInputStream;
19import java.io.FileNotFoundException;
20import java.io.FileOutputStream;
21import java.io.InputStream;
22import java.io.OutputStream;
23import java.security.InvalidAlgorithmParameterException;
24import java.security.InvalidKeyException;
25import java.security.NoSuchAlgorithmException;
26import java.util.concurrent.atomic.AtomicLong;
27
28import javax.crypto.Cipher;
29import javax.crypto.CipherInputStream;
30import javax.crypto.CipherOutputStream;
31import javax.crypto.NoSuchPaddingException;
32import javax.crypto.spec.IvParameterSpec;
33import javax.crypto.spec.SecretKeySpec;
34
35import eu.siacs.conversations.Config;
36import eu.siacs.conversations.entities.DownloadableFile;
37
38public class AbstractConnectionManager {
39 protected XmppConnectionService mXmppConnectionService;
40
41 private static final int UI_REFRESH_THRESHOLD = 250;
42 private static final AtomicLong LAST_UI_UPDATE_CALL = new AtomicLong(0);
43
44 public AbstractConnectionManager(XmppConnectionService service) {
45 this.mXmppConnectionService = service;
46 }
47
48 public XmppConnectionService getXmppConnectionService() {
49 return this.mXmppConnectionService;
50 }
51
52 public long getAutoAcceptFileSize() {
53 String config = this.mXmppConnectionService.getPreferences().getString(
54 "auto_accept_file_size", "524288");
55 try {
56 return Long.parseLong(config);
57 } catch (NumberFormatException e) {
58 return 524288;
59 }
60 }
61
62 public boolean hasStoragePermission() {
63 if (!Config.ONLY_INTERNAL_STORAGE && Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
64 return mXmppConnectionService.checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED;
65 } else {
66 return true;
67 }
68 }
69
70 public static Pair<InputStream,Integer> createInputStream(DownloadableFile file, boolean gcm) throws FileNotFoundException {
71 FileInputStream is;
72 int size;
73 is = new FileInputStream(file);
74 size = (int) file.getSize();
75 if (file.getKey() == null) {
76 return new Pair<InputStream,Integer>(is,size);
77 }
78 try {
79 if (gcm) {
80 AEADBlockCipher cipher = new GCMBlockCipher(new AESEngine());
81 cipher.init(true, new AEADParameters(new KeyParameter(file.getKey()), 128, file.getIv()));
82 InputStream cis = new org.bouncycastle.crypto.io.CipherInputStream(is, cipher);
83 return new Pair<>(cis, cipher.getOutputSize(size));
84 } else {
85 IvParameterSpec ips = new IvParameterSpec(file.getIv());
86 Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
87 cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(file.getKey(), "AES"), ips);
88 Log.d(Config.LOGTAG, "opening encrypted input stream");
89 final int s = Config.REPORT_WRONG_FILESIZE_IN_OTR_JINGLE ? size : (size / 16 + 1) * 16;
90 return new Pair<InputStream,Integer>(new CipherInputStream(is, cipher),s);
91 }
92 } catch (InvalidKeyException e) {
93 return null;
94 } catch (NoSuchAlgorithmException e) {
95 return null;
96 } catch (NoSuchPaddingException e) {
97 return null;
98 } catch (InvalidAlgorithmParameterException e) {
99 return null;
100 }
101 }
102
103 public static OutputStream createAppendedOutputStream(DownloadableFile file) {
104 return createOutputStream(file, false, true);
105 }
106
107 public static OutputStream createOutputStream(DownloadableFile file, boolean gcm) {
108 return createOutputStream(file, gcm, false);
109 }
110
111 private static OutputStream createOutputStream(DownloadableFile file, boolean gcm, boolean append) {
112 FileOutputStream os;
113 try {
114 os = new FileOutputStream(file, append);
115 if (file.getKey() == null) {
116 return os;
117 }
118 } catch (FileNotFoundException e) {
119 return null;
120 }
121 try {
122 if (gcm) {
123 AEADBlockCipher cipher = new GCMBlockCipher(new AESEngine());
124 cipher.init(false, new AEADParameters(new KeyParameter(file.getKey()), 128, file.getIv()));
125 return new org.bouncycastle.crypto.io.CipherOutputStream(os, cipher);
126 } else {
127 IvParameterSpec ips = new IvParameterSpec(file.getIv());
128 Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
129 cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(file.getKey(), "AES"), ips);
130 Log.d(Config.LOGTAG, "opening encrypted output stream");
131 return new CipherOutputStream(os, cipher);
132 }
133 } catch (InvalidKeyException e) {
134 return null;
135 } catch (NoSuchAlgorithmException e) {
136 return null;
137 } catch (NoSuchPaddingException e) {
138 return null;
139 } catch (InvalidAlgorithmParameterException e) {
140 return null;
141 }
142 }
143
144 public void updateConversationUi(boolean force) {
145 synchronized (LAST_UI_UPDATE_CALL) {
146 if (force || SystemClock.elapsedRealtime() - LAST_UI_UPDATE_CALL.get() >= UI_REFRESH_THRESHOLD) {
147 LAST_UI_UPDATE_CALL.set(SystemClock.elapsedRealtime());
148 mXmppConnectionService.updateConversationUi();
149 }
150 }
151 }
152
153 public PowerManager.WakeLock createWakeLock(String name) {
154 PowerManager powerManager = (PowerManager) mXmppConnectionService.getSystemService(Context.POWER_SERVICE);
155 return powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,name);
156 }
157}