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