NetNewsWire/Frameworks/RSParser/HTML/RSHTMLMetadata.m

246 lines
6.1 KiB
Objective-C
Executable File

//
// RSHTMLMetadata.m
// RSParser
//
// Created by Brent Simmons on 3/6/16.
// Copyright © 2016 Ranchero Software, LLC. All rights reserved.
//
#import "RSHTMLMetadata.h"
#import "RSParserInternal.h"
static NSString *urlStringFromDictionary(NSDictionary *d);
static NSString *absoluteURLStringWithRelativeURLString(NSString *relativeURLString, NSString *baseURLString);
static NSString *absoluteURLStringWithDictionary(NSDictionary *d, NSString *baseURLString);
static NSArray *objectsOfClassWithDictionaries(Class class, NSArray *dictionaries, NSString *baseURLString);
static NSString *relValue(NSDictionary *d);
static BOOL typeIsFeedType(NSString *type);
static NSString *kShortcutIconRelValue = @"shortcut icon";
static NSString *kHrefKey = @"href";
static NSString *kSrcKey = @"src";
static NSString *kAppleTouchIconValue = @"apple-touch-icon";
static NSString *kAppleTouchIconPrecomposedValue = @"apple-touch-icon-precomposed";
static NSString *kSizesKey = @"sizes";
static NSString *kTitleKey = @"title";
static NSString *kRelKey = @"rel";
static NSString *kAlternateKey = @"alternate";
static NSString *kRSSSuffix = @"/rss+xml";
static NSString *kAtomSuffix = @"/atom+xml";
static NSString *kTypeKey = @"type";
@interface RSHTMLMetadataAppleTouchIcon ()
- (instancetype)initWithDictionary:(NSDictionary *)d baseURLString:(NSString *)baseURLString;
@end
@interface RSHTMLMetadataFeedLink ()
- (instancetype)initWithDictionary:(NSDictionary *)d baseURLString:(NSString *)baseURLString;
@end
@implementation RSHTMLMetadata
#pragma mark - Init
- (instancetype)initWithURLString:(NSString *)urlString dictionaries:(NSArray <NSDictionary *> *)dictionaries {
self = [super init];
if (!self) {
return nil;
}
_baseURLString = urlString;
_dictionaries = dictionaries;
_faviconLink = [self resolvedLinkFromFirstDictionaryWithMatchingRel:kShortcutIconRelValue];
NSArray *appleTouchIconDictionaries = [self appleTouchIconDictionaries];
_appleTouchIcons = objectsOfClassWithDictionaries([RSHTMLMetadataAppleTouchIcon class], appleTouchIconDictionaries, urlString);
NSArray *feedLinkDictionaries = [self feedLinkDictionaries];
_feedLinks = objectsOfClassWithDictionaries([RSHTMLMetadataFeedLink class], feedLinkDictionaries, urlString);
return self;
}
#pragma mark - Private
- (NSDictionary *)firstDictionaryWithMatchingRel:(NSString *)valueToMatch {
// Case-insensitive.
for (NSDictionary *oneDictionary in self.dictionaries) {
NSString *oneRelValue = relValue(oneDictionary);
if (oneRelValue && [oneRelValue compare:valueToMatch options:NSCaseInsensitiveSearch] == NSOrderedSame) {
return oneDictionary;
}
}
return nil;
}
- (NSArray *)appleTouchIconDictionaries {
NSMutableArray *dictionaries = [NSMutableArray new];
for (NSDictionary *oneDictionary in self.dictionaries) {
NSString *oneRelValue = relValue(oneDictionary).lowercaseString;
if ([oneRelValue isEqualToString:kAppleTouchIconValue] || [oneRelValue isEqualToString:kAppleTouchIconPrecomposedValue]) {
[dictionaries addObject:oneDictionary];
}
}
return dictionaries;
}
- (NSArray *)feedLinkDictionaries {
NSMutableArray *dictionaries = [NSMutableArray new];
for (NSDictionary *oneDictionary in self.dictionaries) {
NSString *oneRelValue = relValue(oneDictionary).lowercaseString;
if (![oneRelValue isEqualToString:kAlternateKey]) {
continue;
}
NSString *oneType = [oneDictionary rsparser_objectForCaseInsensitiveKey:kTypeKey];
if (!typeIsFeedType(oneType)) {
continue;
}
if (RSParserStringIsEmpty(urlStringFromDictionary(oneDictionary))) {
continue;
}
[dictionaries addObject:oneDictionary];
}
return dictionaries;
}
- (NSString *)resolvedLinkFromFirstDictionaryWithMatchingRel:(NSString *)relValue {
NSDictionary *d = [self firstDictionaryWithMatchingRel:relValue];
return absoluteURLStringWithDictionary(d, self.baseURLString);
}
@end
static NSString *relValue(NSDictionary *d) {
return [d rsparser_objectForCaseInsensitiveKey:kRelKey];
}
static NSString *urlStringFromDictionary(NSDictionary *d) {
NSString *urlString = [d rsparser_objectForCaseInsensitiveKey:kHrefKey];
if (urlString) {
return urlString;
}
return [d rsparser_objectForCaseInsensitiveKey:kSrcKey];
}
static NSString *absoluteURLStringWithRelativeURLString(NSString *relativeURLString, NSString *baseURLString) {
NSURL *url = [NSURL URLWithString:baseURLString];
if (!url) {
return nil;
}
NSURL *absoluteURL = [NSURL URLWithString:relativeURLString relativeToURL:url];
return absoluteURL.absoluteString;
}
static NSString *absoluteURLStringWithDictionary(NSDictionary *d, NSString *baseURLString) {
NSString *urlString = urlStringFromDictionary(d);
if (RSParserStringIsEmpty(urlString)) {
return nil;
}
return absoluteURLStringWithRelativeURLString(urlString, baseURLString);
}
static NSArray *objectsOfClassWithDictionaries(Class class, NSArray *dictionaries, NSString *baseURLString) {
NSMutableArray *objects = [NSMutableArray new];
for (NSDictionary *oneDictionary in dictionaries) {
id oneObject = [[class alloc] initWithDictionary:oneDictionary baseURLString:baseURLString];
if (oneObject) {
[objects addObject:oneObject];
}
}
return [objects copy];
}
static BOOL typeIsFeedType(NSString *type) {
type = type.lowercaseString;
return [type hasSuffix:kRSSSuffix] || [type hasSuffix:kAtomSuffix];
}
@implementation RSHTMLMetadataAppleTouchIcon
- (instancetype)initWithDictionary:(NSDictionary *)d baseURLString:(NSString *)baseURLString {
self = [super init];
if (!self) {
return nil;
}
_urlString = absoluteURLStringWithDictionary(d, baseURLString);
_sizes = [d rsparser_objectForCaseInsensitiveKey:kSizesKey];
_rel = [d rsparser_objectForCaseInsensitiveKey:kRelKey];
return self;
}
@end
@implementation RSHTMLMetadataFeedLink
- (instancetype)initWithDictionary:(NSDictionary *)d baseURLString:(NSString *)baseURLString {
self = [super init];
if (!self) {
return nil;
}
_urlString = absoluteURLStringWithDictionary(d, baseURLString);
_title = [d rsparser_objectForCaseInsensitiveKey:kTitleKey];
_type = [d rsparser_objectForCaseInsensitiveKey:kTypeKey];
return self;
}
@end