Tweak.xm

   1 /* Cydia Substrate - Powerful Code Insertion Platform
   2  * Copyright (C) 2008-2013  Jay Freeman (saurik)
   3 */
   4
   5 /* GNU Lesser General Public License, Version 3 {{{ */
   6 /*
   7  * Substrate is free software: you can redistribute it and/or modify it under
   8  * the terms of the GNU Lesser General Public License as published by the
   9  * Free Software Foundation, either version 3 of the License, or (at your
  10  * option) any later version.
  11  *
  12  * Substrate is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  15  * License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public License
  18  * along with Substrate.  If not, see <http://www.gnu.org/licenses/>.
  19 **/
  20 /* }}} */
  21
  22 #import <CoreFoundation/CoreFoundation.h>
  23 #import <Foundation/Foundation.h>
  24 #import <CoreGraphics/CGGeometry.h>
  25 #import <UIKit/UIKit.h>
  26
  27 #include <substrate.h>
  28
  29 Class $SafeModeAlertItem;
  30
  31 @interface SBAlertItem : NSObject {
  32 }
  33 - (UIAlertView *) alertSheet;
  34 - (void) dismiss;
  35 @end
  36
  37 @interface SBAlertItemsController : NSObject {
  38 }
  39 + (SBAlertItemsController *) sharedInstance;
  40 - (void) activateAlertItem:(SBAlertItem *)item;
  41 @end
  42
  43 @interface SBStatusBarTimeView : UIView {
  44 }
  45 - (id) textFont;
  46 @end
  47
  48 @interface UIApplication (CydiaSubstrate)
  49 - (void) applicationOpenURL:(id)url;
  50 @end
  51
  52 @interface UIAlertView (CydiaSubstrate)
  53 - (void) setForceHorizontalButtonsLayout:(BOOL)force;
  54 - (void) setBodyText:(NSString *)body;
  55 - (void) setNumberOfRows:(NSInteger)rows;
  56 @end
  57
  58 void SafeModeButtonClicked(int button) {
  59     switch (button) {
  60         case 1:
  61         break;
  62
  63         case 2:
  64             if (kCFCoreFoundationVersionNumber >= 700)
  65                 system("killall backboardd");
  66             else
  67                 // XXX: there are better ways of restarting SpringBoard that would actually save state
  68                 exit(0);
  69         break;
  70
  71         case 3:
  72             [[UIApplication sharedApplication] applicationOpenURL:[NSURL URLWithString:@"http://cydia.saurik.com/safemode/"]];
  73         break;
  74     }
  75 }
  76
  77 void SafeModeAlertItem$alertSheet$buttonClicked$(id self, SEL sel, id sheet, int button) {
  78     SafeModeButtonClicked(button);
  79     [self dismiss];
  80 }
  81
  82 void SafeModeAlertItem$alertView$clickedButtonAtIndex$(id self, SEL sel, id sheet, NSInteger button) {
  83     SafeModeButtonClicked(button + 1);
  84     [self dismiss];
  85 }
  86
  87 void SafeModeAlertItem$configure$requirePasscodeForActions$(id self, SEL sel, BOOL configure, BOOL require) {
  88     UIAlertView *sheet([self alertSheet]);
  89
  90     [sheet setDelegate:self];
  91     [sheet setBodyText:@"We apologize for the inconvenience, but SpringBoard has just crashed.\n\nMobileSubstrate /did not/ cause this problem: it has protected you from it.\n\nYour device is now running in Safe Mode. All extensions that support this safety system are disabled.\n\nReboot (or restart SpringBoard) to return to the normal mode. To return to this dialog touch the status bar.\n\nTap \"Help\" below for more tips."];
  92     [sheet addButtonWithTitle:@"OK"];
  93     [sheet addButtonWithTitle:@"Restart"];
  94     [sheet addButtonWithTitle:@"Help"];
  95     [sheet setNumberOfRows:1];
  96
  97     if ([sheet respondsToSelector:@selector(setForceHorizontalButtonsLayout:)])
  98         [sheet setForceHorizontalButtonsLayout:YES];
  99 }
 100
 101 void SafeModeAlertItem$performUnlockAction(id self, SEL sel) {
 102     [[%c(SBAlertItemsController) sharedInstance] activateAlertItem:self];
 103 }
 104
 105 static void MSAlert() {
 106     if ($SafeModeAlertItem == nil)
 107         $SafeModeAlertItem = objc_lookUpClass("SafeModeAlertItem");
 108     if ($SafeModeAlertItem == nil) {
 109         $SafeModeAlertItem = objc_allocateClassPair(objc_getClass("SBAlertItem"), "SafeModeAlertItem", 0);
 110         if ($SafeModeAlertItem == nil)
 111             return;
 112
 113         class_addMethod($SafeModeAlertItem, @selector(alertSheet:buttonClicked:), (IMP) &SafeModeAlertItem$alertSheet$buttonClicked$, "v@:@i");
 114         class_addMethod($SafeModeAlertItem, @selector(alertView:clickedButtonAtIndex:), (IMP) &SafeModeAlertItem$alertView$clickedButtonAtIndex$, "v@:@i");
 115         class_addMethod($SafeModeAlertItem, @selector(configure:requirePasscodeForActions:), (IMP) &SafeModeAlertItem$configure$requirePasscodeForActions$, "v@:cc");
 116         class_addMethod($SafeModeAlertItem, @selector(performUnlockAction), (IMP) SafeModeAlertItem$performUnlockAction, "v@:");
 117         objc_registerClassPair($SafeModeAlertItem);
 118     }
 119
 120     if (%c(SBAlertItemsController) != nil)
 121         [[%c(SBAlertItemsController) sharedInstance] activateAlertItem:[[[$SafeModeAlertItem alloc] init] autorelease]];
 122 }
 123
 124
 125 // XXX: on iOS 5.0, we really would prefer avoiding
 126
 127 %hook SBStatusBar
 128 - (void) touchesEnded:(id)touches withEvent:(id)event {
 129     MSAlert();
 130     %orig(touches, event);
 131 } %end
 132
 133 %hook SBStatusBar
 134 - (void) mouseDown:(void *)event {
 135     MSAlert();
 136     %orig(event);
 137 } %end
 138
 139 %hook UIStatusBar
 140 - (void) touchesBegan:(void *)touches withEvent:(void *)event {
 141     MSAlert();
 142     %orig(touches, event);
 143 } %end
 144
 145
 146 // this fairly complex code came from Grant, to solve the "it Safe Mode"-in-bar bug
 147
 148 %hook SBStatusBarDataManager
 149 - (void) _updateTimeString {
 150     char *_data(&MSHookIvar<char>(self, "_data"));
 151     if (_data == NULL)
 152         return;
 153
 154     Ivar _itemIsEnabled(object_getInstanceVariable(self, "_itemIsEnabled", NULL));
 155     if (_itemIsEnabled == NULL)
 156         return;
 157
 158     Ivar _itemIsCloaked(object_getInstanceVariable(self, "_itemIsCloaked", NULL));
 159     if (_itemIsCloaked == NULL)
 160         return;
 161
 162     size_t enabledOffset(ivar_getOffset(_itemIsEnabled));
 163     size_t cloakedOffset(ivar_getOffset(_itemIsCloaked));
 164     if (enabledOffset >= cloakedOffset)
 165         return;
 166
 167     size_t offset(cloakedOffset - enabledOffset);
 168     char *timeString(_data + offset);
 169     strcpy(timeString, "Exit Safe Mode");
 170 } %end
 171
 172
 173 // this /insanely/ complex code came from that parrot guy... omg this is getting bad
 174
 175 @interface SBStatusBarStateAggregator : NSObject
 176 - (void) _stopTimeItemTimer;
 177 @end
 178
 179 %hook SBStatusBarStateAggregator
 180
 181 - (void) _updateTimeItems {
 182     if ([self respondsToSelector:@selector(_stopTimeItemTimer)])
 183         [self _stopTimeItemTimer];
 184     %orig;
 185 }
 186
 187 - (void) _restartTimeItemTimer {
 188 }
 189
 190 - (void) _resetTimeItemFormatter {
 191     %orig;
 192     if (NSDateFormatter *df = MSHookIvar<NSDateFormatter *>(self, "_timeItemDateFormatter"))
 193         [df setDateFormat:@"'Exit' 'Safe' 'Mode'"];
 194 }
 195
 196 %end
 197
 198
 199 static bool alerted_;
 200
 201 static void AlertIfNeeded() {
 202     if (alerted_)
 203         return;
 204     alerted_ = true;
 205     MSAlert();
 206 }
 207
 208
 209 // on iOS 4.3 and above we can use this advertisement, which seems to check every time the user unlocks
 210 // XXX: verify that this still works on iOS 5.0
 211
 212 %hook AAAccountManager
 213 + (void) showMobileMeOfferIfNecessary {
 214     AlertIfNeeded();
 215 } %end
 216
 217
 218 // -[SBIconController showInfoAlertIfNeeded] explains how to drag icons around the iPhone home screen
 219 // it used to be shown to users when they unlocked their screen for the first time, and happened every unlock
 220 // however, as of iOS 4.3, it got relegated to only appearing once the user installed an app or web clip
 221
 222 %hook SBIconController
 223 - (void) showInfoAlertIfNeeded {
 224     AlertIfNeeded();
 225 } %end
 226
 227
 228 // the icon state, including crazy configurations like Five Icon Dock, is stored in SpringBoard's defaults
 229 // unfortunately, SpringBoard on iOS 2.0 and 2.1 (maybe 2.2 as well) buffer overrun with more than 4 icons
 230 // there is a third party package called IconSupport that remedies this, but not everyone is using it yet
 231
 232 %hook SBButtonBar
 233 - (int) maxIconColumns {
 234     static int max;
 235     if (max == 0) {
 236         max = %orig();
 237         if (NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults])
 238             if (NSDictionary *iconState = [defaults objectForKey:@"iconState"])
 239                 if (NSDictionary *buttonBar = [iconState objectForKey:@"buttonBar"])
 240                     if (NSArray *iconMatrix = [buttonBar objectForKey:@"iconMatrix"])
 241                         if ([iconMatrix count] != 0)
 242                             if (NSArray *row = [iconMatrix objectAtIndex:0]) {
 243                                 int count([row count]);
 244                                 if (max < count)
 245                                     max = count;
 246                             }
 247     } return max;
 248 } %end
 249
 250
 251 %hook SBUIController
 252 - (id) init {
 253     if ((self = %orig()) != nil) {
 254         UIView *&_contentLayer(MSHookIvar<UIView *>(self, "_contentLayer"));
 255         UIView *&_contentView(MSHookIvar<UIView *>(self, "_contentView"));
 256
 257         UIView *layer;
 258         if (&_contentLayer != NULL)
 259             layer = _contentLayer;
 260         else if (&_contentView != NULL)
 261             layer = _contentView;
 262         else
 263             layer = nil;
 264
 265         if (layer != nil)
 266             [layer setBackgroundColor:[UIColor darkGrayColor]];
 267     } return self;
 268 } %end
 269
 270 #define Paper_ "/Library/MobileSubstrate/MobileSafety.png"
 271
 272 %hook UIImage
 273 + (UIImage *) defaultDesktopImage {
 274     return [UIImage imageWithContentsOfFile:@Paper_];
 275 } %end
 276
 277 %hook SBStatusBarTimeView
 278 - (void) tile {
 279     NSString *&_time(MSHookIvar<NSString *>(self, "_time"));
 280     CGRect &_textRect(MSHookIvar<CGRect>(self, "_textRect"));
 281     if (_time != nil)
 282         [_time release];
 283     _time = [@"Exit Safe Mode" retain];
 284     id font([self textFont]);
 285     CGSize size([_time sizeWithFont:font]);
 286     CGRect frame([self frame]);
 287     _textRect.size = size;
 288     _textRect.origin.x = (frame.size.width - size.width) / 2;
 289     _textRect.origin.y = (frame.size.height - size.height) / 2;
 290 } %end
 291
 292
 293 // notification widgets ("wee apps" or "bulletin board sections") are capable of crashing SpringBoard
 294 // unfortunately, which ones are in use are stored in SpringBoard's defaults, so we need to turn them off
 295
 296 %hook BBSectionInfo
 297 - (BOOL) showsInNotificationCenter {
 298     return NO;
 299 } %end
 300
 301
 302 // on iOS 6.0, Apple split parts of SpringBoard into a daemon called backboardd, including app launches
 303 // in order to allow safe mode to propogate into applications, we need to then tell backboardd here
 304 // XXX: (all of this should be replaced, however, with per-process launchd-mediated exception handling)
 305
 306 %hook BKSApplicationLaunchSettings
 307 - (void) setEnvironment:(NSDictionary *)original {
 308     if (original == nil)
 309         return %orig(nil);
 310
 311     NSMutableDictionary *modified([original mutableCopy]);
 312     [modified setObject:@"1" forKey:@"_MSSafeMode"];
 313     return %orig(modified);
 314 } %end
 315
 316 %ctor {
 317     NSAutoreleasePool *pool([[NSAutoreleasePool alloc] init]);
 318
 319     // on iOS 6, backboardd is in charge of brightness, and freaks out when SpringBoard restarts :(
 320     // the result is that the device is super dark until we attempt to update the brightness here.
 321
 322     if (kCFCoreFoundationVersionNumber >= 700) {
 323         if (void (*GSEventSetBacklightLevel)(float) = reinterpret_cast<void (*)(float)>(dlsym(RTLD_DEFAULT, "GSEventSetBacklightLevel")))
 324             if (NSMutableDictionary *defaults = [NSMutableDictionary dictionaryWithContentsOfFile:[NSString stringWithFormat:@"%@/Library/Preferences/com.apple.springboard.plist", NSHomeDirectory()]])
 325                 if (NSNumber *level = [defaults objectForKey:@"SBBacklightLevel2"])
 326                     GSEventSetBacklightLevel([level floatValue]);
 327     }
 328
 329     [pool release];
 330 }