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Properly maintain aspect ratio of inline images (#7503)

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Michael Telatynski 2022-01-10 15:32:06 +00:00 committed by GitHub
parent 5cfb046816
commit 3c1ce77d48
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3 changed files with 28 additions and 8 deletions
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9
res/css/views/rooms/_EventTile.scss
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@ -450,6 +450,15 @@ $left-gutter: 64px;
pre {
border: 1px solid transparent;
}
// selector wrongly applies to pill avatars but those have explicit width/height passed at a higher specificity
&.markdown-body img {
// the image will have max-width and max-height applied during sanitization
width: 100%;
height: 100%;
object-fit: contain;
object-position: left top;
}
}
.mx_EventTile_clamp {

24
src/HtmlUtils.tsx
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@ -207,8 +207,12 @@ const transformTags: IExtendedSanitizeOptions["transformTags"] = { // custom to
return { tagName, attribs: {} };
}
const width = Number(attribs.width) || 800;
const height = Number(attribs.height) || 600;
const width = Math.min(Number(attribs.width) || 800, 800);
const height = Math.min(Number(attribs.height) || 600, 600);
// specify width/height as max values instead of absolute ones to allow object-fit to do its thing
// we only allow our own styles for this tag so overwrite the attribute
attribs.style = `max-width: ${width}px; max-height: ${height}px;`;
attribs.src = mediaFromMxc(src).getThumbnailOfSourceHttp(width, height);
return { tagName, attribs };
},
@ -223,9 +227,12 @@ const transformTags: IExtendedSanitizeOptions["transformTags"] = { // custom to
return { tagName, attribs };
},
'*': function(tagName: string, attribs: sanitizeHtml.Attributes) {
// Delete any style previously assigned, style is an allowedTag for font and span
// because attributes are stripped after transforming
delete attribs.style;
// Delete any style previously assigned, style is an allowedTag for font, span & img,
// because attributes are stripped after transforming.
// For img this is trusted as it is generated wholly within the img transformation method.
if (tagName !== "img") {
delete attribs.style;
}
// Sanitise and transform data-mx-color and data-mx-bg-color to their CSS
// equivalents
@ -249,7 +256,7 @@ const transformTags: IExtendedSanitizeOptions["transformTags"] = { // custom to
});
if (style) {
attribs.style = style;
attribs.style = style + (attribs.style || "");
}
return { tagName, attribs };
@ -266,12 +273,15 @@ const sanitizeHtmlParams: IExtendedSanitizeOptions = {
'details', 'summary',
],
allowedAttributes: {
// attribute sanitization happens after transformations, so we have to accept `style` for font, span & img
// but strip during the transformation.
// custom ones first:
font: ['color', 'data-mx-bg-color', 'data-mx-color', 'style'], // custom to matrix
span: ['data-mx-maths', 'data-mx-bg-color', 'data-mx-color', 'data-mx-spoiler', 'style'], // custom to matrix
div: ['data-mx-maths'],
a: ['href', 'name', 'target', 'rel'], // remote target: custom to matrix
img: ['src', 'width', 'height', 'alt', 'title'],
// img tags also accept width/height, we just map those to max-width & max-height during transformation
img: ['src', 'alt', 'title', 'style'],
ol: ['start'],
code: ['class'], // We don't actually allow all classes, we filter them in transformTags
},

3
test/components/structures/GroupView-test.js
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@ -264,7 +264,8 @@ describe('GroupView', function() {
const imgSrc = "https://my.home.server/_matrix/media/r0/thumbnail/someimageurl" +
"?width=800&height=600&method=scale";
expect(longDescElement.innerHTML).toContain('<img src="' + imgSrc + '">');
expect(longDescElement.innerHTML).toContain('<img src="' + imgSrc + '" ' +
'style="max-width:800px;max-height:600px">');
});
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