Classes/DetailViewController.m

/*
     File: DetailViewController.m
 Abstract: 
 Controller for editing text view data.
 
  Version: 1.2
 
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*/
 
#import <Security/Security.h>
 
#import "DetailViewController.h"
#import "KeychainItemWrapper.h"
#import "EditorController.h"
 
enum {
    kUsernameSection = 0,
    kPasswordSection,
    kAccountNumberSection,
    kShowCleartextSection
};
 
// Defined UI constants.
static NSInteger kPasswordTag   = 2;    // Tag table view cells that contain a text field to support secure text entry.
 
@implementation DetailViewController
 
@synthesize tableView, textFieldController, passwordItem, accountNumberItem;
 
+ (NSString *)titleForSection:(NSInteger)section
{
    switch (section)
    {
        case kUsernameSection: return NSLocalizedString(@"Username", @"");
        case kPasswordSection: return NSLocalizedString(@"Password", @"");
        case kAccountNumberSection: return NSLocalizedString(@"Account Number", @"");
    }
    return nil;
}
 
+ (id)secAttrForSection:(NSInteger)section
{
    switch (section)
    {
        case kUsernameSection: return (id)kSecAttrAccount;
        case kPasswordSection: return (id)kSecValueData;
        case kAccountNumberSection: return (id)kSecValueData;
    }
    return nil;
}
 
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])
    {
        // Title displayed by the navigation controller.
        self.title = @"Keychain";
    }
    return self;
}
 
- (void)dealloc
{
    // Release allocated resources.
    [tableView release];
    [textFieldController release];
    [passwordItem release];
    [accountNumberItem release];
    [super dealloc];
}
 
- (void)awakeFromNib {
    self.navigationItem.rightBarButtonItem = self.editButtonItem;
    self.view.backgroundColor = [UIColor groupTableViewBackgroundColor];
}
 
- (void)switchAction:(id)sender
{
    UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:
                             [NSIndexPath indexPathForRow:0 inSection:kPasswordSection]];
    UITextField *textField = (UITextField *) [cell.contentView viewWithTag:kPasswordTag];
    textField.secureTextEntry = ![sender isOn];
    
    cell = [self.tableView cellForRowAtIndexPath:
            [NSIndexPath indexPathForRow:0 inSection:kAccountNumberSection]];
    textField = (UITextField *) [cell.contentView viewWithTag:kPasswordTag];
    textField.secureTextEntry = ![sender isOn];
}
 
// Action sheet delegate method.
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
    // the user clicked one of the OK/Cancel buttons
    if (buttonIndex == 0)
    {
        [passwordItem resetKeychainItem];
        [accountNumberItem resetKeychainItem];
        [self.tableView reloadData];
    }
}
 
- (IBAction)resetKeychain:(id)sender
{
    // open a dialog with an OK and cancel button
    UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@"Reset Generic Keychain Item?"
            delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:@"OK" otherButtonTitles:nil];
    actionSheet.actionSheetStyle = UIActionSheetStyleDefault;
    [actionSheet showInView:self.view];
    [actionSheet release];
}
 
- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [tableView reloadData];
}
 
- (void)setEditing:(BOOL)editing animated:(BOOL)animated
{
    [super setEditing:editing animated:animated];
    [tableView reloadData];
}
 
#pragma mark -
#pragma mark <UITableViewDelegate, UITableViewDataSource> Methods
 
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tv
{
    // 4 sections, one for each property and one for the switch
    return 4;
}
 
- (NSInteger)tableView:(UITableView *)tv numberOfRowsInSection:(NSInteger)section
{
    // Only one row for each section
    return 1;
}
 
- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section
{
    return (section == kAccountNumberSection) ? 48.0 : 0.0;
}
 
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    return [DetailViewController titleForSection:section];
}
 
- (NSString *)tableView:(UITableView *)tableView titleForFooterInSection:(NSInteger)section
{
    NSString *title = nil;
    
    if (section == kAccountNumberSection)
    {
        title = NSLocalizedString(@"AccountNumberShared", @"");
    }
    
    return title;
}
 
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)aTableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{
    static NSString *kUsernameCellIdentifier =  @"UsernameCell";
    static NSString *kPasswordCellIdentifier =  @"PasswordCell";
    static NSString *kSwitchCellIdentifier =    @"SwitchCell";
    
    UITableViewCell *cell = nil;    
    
    switch (indexPath.section)
    {
        case kUsernameSection:
        {
            cell = [aTableView dequeueReusableCellWithIdentifier:kUsernameCellIdentifier];
            if (cell == nil)
            {
                cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:kUsernameCellIdentifier] autorelease];
            }
            
            cell.textLabel.text = [passwordItem objectForKey:[DetailViewController secAttrForSection:indexPath.section]];
            cell.accessoryType = (self.editing) ? UITableViewCellAccessoryDisclosureIndicator : UITableViewCellAccessoryNone;
            
            break;
        }
            
        case kPasswordSection:
        case kAccountNumberSection:
        {
            UITextField *textField = nil;
            
            cell = [aTableView dequeueReusableCellWithIdentifier:kPasswordCellIdentifier];
            if (cell == nil)
            {
                cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:kPasswordCellIdentifier] autorelease];
 
                textField = [[UITextField alloc] initWithFrame:CGRectInset(cell.contentView.bounds, 10, 10)];
                textField.tag = kPasswordTag;
                textField.font = [UIFont systemFontOfSize:17.0];
                
                // prevent editing
                textField.enabled = NO;
                
                // display contents as bullets rather than text
                textField.secureTextEntry = YES;
                
                [cell.contentView addSubview:textField];
                [textField release];
            }
            else {
                textField = (UITextField *) [cell.contentView viewWithTag:kPasswordTag];
            }
            
            KeychainItemWrapper *wrapper = (indexPath.section == kPasswordSection) ? passwordItem : accountNumberItem;
            textField.text = [wrapper objectForKey:[DetailViewController secAttrForSection:indexPath.section]];
            cell.accessoryType = (self.editing) ? UITableViewCellAccessoryDisclosureIndicator : UITableViewCellAccessoryNone;
                        
            break;
        }
                        
        case kShowCleartextSection:
        {
            cell = [aTableView dequeueReusableCellWithIdentifier:kSwitchCellIdentifier];
            if (cell == nil)
            {
                cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:kSwitchCellIdentifier] autorelease];
                
                cell.textLabel.text = NSLocalizedString(@"Show Cleartext", @"");
                cell.selectionStyle = UITableViewCellSelectionStyleNone;
 
                UISwitch *switchCtl = [[[UISwitch alloc] initWithFrame:CGRectMake(194, 8, 94, 27)] autorelease];
                [switchCtl addTarget:self action:@selector(switchAction:) forControlEvents:UIControlEventValueChanged];
                [cell.contentView addSubview:switchCtl];
            }
            
            break;
        }
    }
    
    return cell;
}
 
 
- (void)tableView:(UITableView *)aTableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{    
    if (indexPath.section != kShowCleartextSection)
    {
        [tableView deselectRowAtIndexPath:indexPath animated:YES];
        id secAttr = [DetailViewController secAttrForSection:indexPath.section];
        [textFieldController.textControl setPlaceholder:[DetailViewController titleForSection:indexPath.section]];
        [textFieldController.textControl setSecureTextEntry:(indexPath.section == kPasswordSection || indexPath.section == kAccountNumberSection)];
        if (indexPath.section == kUsernameSection || indexPath.section == kPasswordSection)
        {
            textFieldController.keychainItemWrapper = passwordItem;
        }
        else {
            textFieldController.keychainItemWrapper = accountNumberItem;
        }
        textFieldController.textValue = [textFieldController.keychainItemWrapper objectForKey:secAttr];
        textFieldController.editedFieldKey = secAttr;
        textFieldController.title = [DetailViewController titleForSection:indexPath.section];
        
        [self.navigationController pushViewController:textFieldController animated:YES];
    }
}
 
@end