c29f4cc9b4
* New LICENSE-COMMERCIAL file * Apply dual licenses: AGPL + Element Commercial to file headers * Update README with dual licensing
66 lines
2.8 KiB
Swift
66 lines
2.8 KiB
Swift
//
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// Copyright 2022-2024 New Vector Ltd.
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//
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// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
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// Please see LICENSE files in the repository root for full details.
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//
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import DTCoreText
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import Foundation
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public extension DTHTMLElement {
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/// Sanitize the element using the given parameters.
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/// - Parameters:
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/// - font: The default font to use when resetting the content of any unsupported tags.
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@objc func sanitize(font: UIFont) {
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if let name, !Self.allowedHTMLTags.contains(name) {
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// This is an unsupported tag.
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// Remove any attachments to fix rendering.
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textAttachment = nil
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// If the element has plain text content show that,
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// otherwise prevent the tag from displaying.
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if let stringContent = attributedString()?.string,
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!stringContent.isEmpty,
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let element = DTTextHTMLElement(name: nil, attributes: nil) {
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element.setText(stringContent)
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removeAllChildNodes()
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addChildNode(element)
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if let parent = parent() {
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element.inheritAttributes(from: parent)
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} else {
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fontDescriptor = DTCoreTextFontDescriptor()
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fontDescriptor.fontFamily = font.familyName
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fontDescriptor.fontName = font.fontName
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fontDescriptor.pointSize = font.pointSize
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paragraphStyle = DTCoreTextParagraphStyle.default()
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element.inheritAttributes(from: self)
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}
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element.interpretAttributes()
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} else if let parent = parent() {
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parent.removeChildNode(self)
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} else {
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didOutput = true
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}
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} else {
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// This element is a supported tag, but it may contain children that aren't,
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// so santize all child nodes to ensure correct tags.
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if let childNodes = childNodes as? [DTHTMLElement] {
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childNodes.forEach { $0.sanitize(font: font) }
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}
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}
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}
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private static let allowedHTMLTags = ["font", // custom to matrix for IRC-style font coloring
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"del", // for markdown
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"body", // added internally by DTCoreText
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"mx-reply",
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"h1", "h2", "h3", "h4", "h5", "h6", "blockquote", "p", "a", "ul", "ol",
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"nl", "li", "b", "i", "u", "strong", "em", "strike", "code", "hr", "br", "div",
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"table", "thead", "caption", "tbody", "tr", "th", "td", "pre"]
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}
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