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//
// KSURLFormatter.m
//
// Copyright (c) 2008-2012 Mike Abdullah and Karelia Software
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL MIKE ABDULLAH OR KARELIA SOFTWARE BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
#import "KSURLFormatter.h"
#import "KSURLUtilities.h"
@implementation KSURLFormatter
#pragma mark Class Methods
+ (NSURL *)URLFromString:(NSString *)string;
{
// Encode the URL string
CFStringRef escapedString = CFURLCreateStringByAddingPercentEscapes(NULL,
(CFStringRef)string,
(CFStringRef)@"%+#",
NULL,
kCFStringEncodingUTF8);
// If we're still left with a valid string, turn it into a URL
NSURL *result = nil;
if (escapedString)
{
result = [NSURL URLWithString:(NSString *)escapedString];
CFRelease(escapedString);
}
return result;
}
+ (BOOL)isValidEmailAddress:(NSString *)address;
{
// for now, just validate that syntactically it it at least _@_.__
// though we are not checking actual other characters.
// we can refine this over time
NSRange whereAt = [address rangeOfString:@"@"];
BOOL OK = (whereAt.location != NSNotFound && whereAt.location >= 1); // make sure there is an @ and it's not the first character
if (OK)
{
NSInteger len = [address length] - whereAt.location;
NSRange whereDot = [address rangeOfString:@"." options:0 range:NSMakeRange(whereAt.location, len)];
OK = (whereDot.location != NSNotFound);
if (OK)
{
// make sure there is room between the @ and the .
OK = (whereDot.location - whereAt.location >= 2) && ([address length] - whereDot.location >= 3);
}
}
return OK;
}
#pragma mark Init & Dealloc
- (id)init
{
[super init];
_defaultScheme = [@"http" retain];
_fallbackTopLevelDomain = [@"com" retain];
return self;
}
- (void)dealloc
{
[_defaultScheme release];
[_allowedSchemes release];
[_fallbackTopLevelDomain release];
[super dealloc];
}
#pragma mark Managing Behaviour
@synthesize useDisplayNameForFileURLs = _useDisplayNameForFileURLs;
@synthesize defaultScheme = _defaultScheme;
@synthesize allowedSchemes = _allowedSchemes;
- (void)setAllowedSchemes:(NSArray *)schemes;
{
if (schemes) NSParameterAssert([schemes count] > 0);
schemes = [schemes copy];
[_allowedSchemes release]; _allowedSchemes = schemes;
}
@synthesize fallbackTopLevelDomain = _fallbackTopLevelDomain;
#pragma mark Textual Representation of Cell Content
- (NSString *)stringForObjectValue:(id)anObject
{
if (!anObject) return nil;
if (![anObject isKindOfClass:[NSURL class]]) return [anObject description];
NSURL *URL = anObject;
NSString *result;
if ([self useDisplayNameForFileURLs] && [anObject isFileURL])
{
result = [[NSFileManager defaultManager] displayNameAtPath:[URL path]];
}
else
{
result = [URL absoluteString];
// Append trailing slash if needed
if ([URL ks_hasNetworkLocation] && [[URL path] isEqualToString:@""])
{
result = [result stringByAppendingString:@"/"];
}
}
return result;
}
#pragma mark Object Equivalent to Textual Representation
+ (NSURL *)URLFromString:(NSString *)string defaultScheme:(NSString *)fallbackScheme;
{
// Tries to interpret the string as a complete URL. If there is no scheme specified, try it as an email address. If that doesn't seem reasonable, combine with fallbackScheme
NSURL *result = [self URLFromString:string];
// Allow fragment links as-is
if ([string hasPrefix:@"#"] && ([string length] > [@"#" length] && result))
{
return result;
}
// This is probably a really naive check
if ((![result scheme] && ![string hasPrefix:@"/"]) || // e.g. foo
(![result host])) // e.g. foo.com:8888
{
// if it looks like an email address, use mailto:
if ([self isValidEmailAddress:string])
{
result = [NSURL URLWithString:[NSString stringWithFormat:@"mailto:%@", string]];
}
else
{
result = [self URLFromString:[NSString stringWithFormat:
@"%@://%@",
fallbackScheme,
string]];
}
}
// Append a trailing slash if needed
if ([result ks_hasNetworkLocation] && [[result path] isEqualToString:@""])
{
result = [[NSURL URLWithString:@"/" relativeToURL:result] absoluteURL];
}
return result;
}
- (BOOL)getObjectValue:(id *)anObject forString:(NSString *)string errorDescription:(NSString **)error
{
if (anObject)
{
NSURL *URL = [self URLFromString:string];
if ([self generatesURLStrings])
{
*anObject = [URL absoluteString];
}
else
{
*anObject = URL;
}
}
return YES;
}
- (NSURL *)URLFromString:(NSString *)string;
{
NSURL *result = nil;
if ([string length] > 0)
{
result = [KSURLFormatter URLFromString:string defaultScheme:[self defaultScheme]];
// Does the URL have no useful resource specified? If so, generate nil URL
if (result && ![[result scheme] isEqualToString:@"mailto"])
{
NSString *resource = [result resourceSpecifier];
if ([resource length] == 0 ||
[resource isEqualToString:@"/"] ||
[resource isEqualToString:@"//"])
{
result = nil;
}
// URLs should also really have a host and a path
if (result)
{
NSString *host = [result host];
NSString *path = [result path];
if (!host && !path && ![result fragment])
{
result = nil;
}
}
}
// Did the user not enter a top-level domain? We'll guess for them
if (result && [self fallbackTopLevelDomain])
{
if ([[result ks_domains] count] == 1)
{
NSString *urlString = [NSString stringWithFormat:
@"%@://%@.%@/",
[result scheme],
[result host],
[self fallbackTopLevelDomain]];
result = [NSURL URLWithString:urlString];
}
}
// Make sure the scheme is allowed
NSArray *allowedSchemes = [self allowedSchemes];
if (allowedSchemes)
{
NSString *scheme = [result scheme];
if (scheme && ![allowedSchemes containsObject:[result scheme]])
{
// Look for the best matching scheme based on the assumption that the URL was simply pasted in missing a small number of initial characters
for (NSString *aScheme in allowedSchemes)
{
if ([aScheme hasSuffix:scheme])
{
result = [result ks_URLWithScheme:aScheme];
return result;
}
}
// Nothing matched? Alright, go for the first one then
result = [result ks_URLWithScheme:[allowedSchemes objectAtIndex:0]];
}
}
}
return result;
}
@synthesize generatesURLStrings = _generateStrings;
@end
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