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 static bool alerted_;
 174
 175 static void AlertIfNeeded() {
 176     if (alerted_)
 177         return;
 178     alerted_ = true;
 179     MSAlert();
 180 }
 181
 182
 183 // on iOS 4.3 and above we can use this advertisement, which seems to check every time the user unlocks
 184 // XXX: verify that this still works on iOS 5.0
 185
 186 %hook AAAccountManager
 187 + (void) showMobileMeOfferIfNecessary {
 188     AlertIfNeeded();
 189 } %end
 190
 191
 192 // -[SBIconController showInfoAlertIfNeeded] explains how to drag icons around the iPhone home screen
 193 // it used to be shown to users when they unlocked their screen for the first time, and happened every unlock
 194 // however, as of iOS 4.3, it got relegated to only appearing once the user installed an app or web clip
 195
 196 %hook SBIconController
 197 - (void) showInfoAlertIfNeeded {
 198     AlertIfNeeded();
 199 } %end
 200
 201
 202 // the icon state, including crazy configurations like Five Icon Dock, is stored in SpringBoard's defaults
 203 // unfortunately, SpringBoard on iOS 2.0 and 2.1 (maybe 2.2 as well) buffer overrun with more than 4 icons
 204 // there is a third party package called IconSupport that remedies this, but not everyone is using it yet
 205
 206 %hook SBButtonBar
 207 - (int) maxIconColumns {
 208     static int max;
 209     if (max == 0) {
 210         max = %orig();
 211         if (NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults])
 212             if (NSDictionary *iconState = [defaults objectForKey:@"iconState"])
 213                 if (NSDictionary *buttonBar = [iconState objectForKey:@"buttonBar"])
 214                     if (NSArray *iconMatrix = [buttonBar objectForKey:@"iconMatrix"])
 215                         if ([iconMatrix count] != 0)
 216                             if (NSArray *row = [iconMatrix objectAtIndex:0]) {
 217                                 int count([row count]);
 218                                 if (max < count)
 219                                     max = count;
 220                             }
 221     } return max;
 222 } %end
 223
 224
 225 %hook SBUIController
 226 - (id) init {
 227     if ((self = %orig()) != nil) {
 228         UIView *&_contentLayer(MSHookIvar<UIView *>(self, "_contentLayer"));
 229         UIView *&_contentView(MSHookIvar<UIView *>(self, "_contentView"));
 230
 231         UIView *layer;
 232         if (&_contentLayer != NULL)
 233             layer = _contentLayer;
 234         else if (&_contentView != NULL)
 235             layer = _contentView;
 236         else
 237             layer = nil;
 238
 239         if (layer != nil)
 240             [layer setBackgroundColor:[UIColor darkGrayColor]];
 241     } return self;
 242 } %end
 243
 244 #define Paper_ "/Library/MobileSubstrate/MobileSafety.png"
 245
 246 %hook UIImage
 247 + (UIImage *) defaultDesktopImage {
 248     return [UIImage imageWithContentsOfFile:@Paper_];
 249 } %end
 250
 251 %hook SBStatusBarTimeView
 252 - (void) tile {
 253     NSString *&_time(MSHookIvar<NSString *>(self, "_time"));
 254     CGRect &_textRect(MSHookIvar<CGRect>(self, "_textRect"));
 255     if (_time != nil)
 256         [_time release];
 257     _time = [@"Exit Safe Mode" retain];
 258     id font([self textFont]);
 259     CGSize size([_time sizeWithFont:font]);
 260     CGRect frame([self frame]);
 261     _textRect.size = size;
 262     _textRect.origin.x = (frame.size.width - size.width) / 2;
 263     _textRect.origin.y = (frame.size.height - size.height) / 2;
 264 } %end
 265
 266
 267 // notification widgets ("wee apps" or "bulletin board sections") are capable of crashing SpringBoard
 268 // unfortunately, which ones are in use are stored in SpringBoard's defaults, so we need to turn them off
 269
 270 %hook BBSectionInfo
 271 - (BOOL) showsInNotificationCenter {
 272     return NO;
 273 } %end
 274
 275
 276 // on iOS 6.0, Apple split parts of SpringBoard into a daemon called backboardd, including app launches
 277 // in order to allow safe mode to propogate into applications, we need to then tell backboardd here
 278 // XXX: (all of this should be replaced, however, with per-process launchd-mediated exception handling)
 279
 280 %hook BKSApplicationLaunchSettings
 281 - (void) setEnvironment:(NSDictionary *)original {
 282     if (original == nil)
 283         return %orig(nil);
 284
 285     NSMutableDictionary *modified([original mutableCopy]);
 286     [modified setObject:@"1" forKey:@"_MSSafeMode"];
 287     return %orig(modified);
 288 } %end
 289
 290 %ctor {
 291     NSAutoreleasePool *pool([[NSAutoreleasePool alloc] init]);
 292
 293     // on iOS 6, backboardd is in charge of brightness, and freaks out when SpringBoard restarts :(
 294     // the result is that the device is super dark until we attempt to update the brightness here.
 295
 296     if (kCFCoreFoundationVersionNumber >= 700) {
 297         if (void (*GSEventSetBacklightLevel)(float) = reinterpret_cast<void (*)(float)>(dlsym(RTLD_DEFAULT, "GSEventSetBacklightLevel")))
 298             if (NSMutableDictionary *defaults = [NSMutableDictionary dictionaryWithContentsOfFile:[NSString stringWithFormat:@"%@/Library/Preferences/com.apple.springboard.plist", NSHomeDirectory()]])
 299                 if (NSNumber *level = [defaults objectForKey:@"SBBacklightLevel2"])
 300                     GSEventSetBacklightLevel([level floatValue]);
 301     }
 302
 303     [pool release];
 304 }