mirror of
https://github.com/vector-im/element-ios.git
synced 2024-09-29 15:52:40 +00:00
61 lines
2.7 KiB
Objective-C
61 lines
2.7 KiB
Objective-C
//
|
|
// Copyright 2021 New Vector Ltd
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
//
|
|
|
|
#import "HTMLFormatter.h"
|
|
#import "GeneratedInterface-Swift.h"
|
|
|
|
@implementation HTMLFormatter
|
|
|
|
- (NSAttributedString *)formatHTML:(NSString *)htmlString withAllowedTags:(NSArray<NSString *> *)allowedTags fontSize:(CGFloat)fontSize
|
|
{
|
|
// TODO: This method should be more general purpose and usable from MXKEventFormatter and GroupHomeViewController
|
|
// FIXME: The implementation is currently in Objective-C as there is a crash in the callback when implemented in Swift
|
|
UIFont *font = [UIFont systemFontOfSize:fontSize];
|
|
|
|
// Do some sanitisation before finalizing the string
|
|
DTHTMLAttributedStringBuilderWillFlushCallback sanitizeCallback = ^(DTHTMLElement *element) {
|
|
[element sanitizeWith:allowedTags bodyFont:font imageHandler:nil];
|
|
};
|
|
|
|
NSDictionary *options = @{
|
|
DTUseiOS6Attributes: @(YES), // Enable it to be able to display the attributed string in a UITextView
|
|
DTDefaultFontFamily: font.familyName,
|
|
DTDefaultFontName: font.fontName,
|
|
DTDefaultFontSize: @(font.pointSize),
|
|
DTDefaultLinkDecoration: @(NO),
|
|
DTWillFlushBlockCallBack: sanitizeCallback
|
|
};
|
|
|
|
// Do not use the default HTML renderer of NSAttributedString because this method
|
|
// runs on the UI thread which we want to avoid because renderHTMLString is called
|
|
// most of the time from a background thread.
|
|
// Use DTCoreText HTML renderer instead.
|
|
// Using DTCoreText, which renders static string, helps to avoid code injection attacks
|
|
// that could happen with the default HTML renderer of NSAttributedString which is a
|
|
// webview.
|
|
NSAttributedString *string = [[NSAttributedString alloc] initWithHTMLData:[htmlString dataUsingEncoding:NSUTF8StringEncoding] options:options documentAttributes:NULL];
|
|
|
|
// Apply additional treatments
|
|
string = [MXKTools removeDTCoreTextArtifacts:string];
|
|
|
|
if (!string) {
|
|
return [[NSAttributedString alloc] initWithString:htmlString];
|
|
}
|
|
|
|
return string;
|
|
}
|
|
|
|
@end
|