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FIX - use ImageMagick to determine size of svg images (#12230) 

SVG files can have dimensions expressed in inches, centimeters, etc., which may lead to the dimensions being misinterpreted (e.g. “8in” ends up as 8 pixels).

If the file type is `svg`, ask ImageMagick to work out what size the SVG file should be rendered on screen.

NOTE: The `pencil.svg` file was obtained from https://freesvg.org/1534028868, which has placed the file in to the public domain.
This commit is contained in:
jbrw 2021-03-01 11:44:00 -05:00 committed by GitHub
parent 6809cccd88
commit a9b6f4d829
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 272 additions and 3 deletions
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4
app/models/upload.rb
View File

@ -224,7 +224,11 @@ class Upload < ActiveRecord::Base
end
begin
if extension == 'svg'
w, h = Discourse::Utils.execute_command("identify", "-format", "%w %h", path).split(' ') rescue [0, 0]
else
w, h = FastImage.new(path, raise_on_failure: true).size
end
self.width = w || 0
self.height = h || 0

10
lib/upload_creator.rb
View File

@ -124,8 +124,14 @@ class UploadCreator
@upload.extension = image_type || File.extname(@filename)[1..10]
if is_image
@upload.thumbnail_width, @upload.thumbnail_height = ImageSizer.resize(*@image_info.size)
@upload.width, @upload.height = @image_info.size
if @image_info.type.to_s == 'svg'
w, h = Discourse::Utils.execute_command("identify", "-format", "%w %h", @file.path).split(' ') rescue [0, 0]
else
w, h = @image_info.size
end
@upload.thumbnail_width, @upload.thumbnail_height = ImageSizer.resize(w, h)
@upload.width, @upload.height = w, h
@upload.animated = animated?
end

245
spec/fixtures/images/pencil.svg vendored Normal file
View File

@ -0,0 +1,245 @@
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xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:cc="http://creativecommons.org/ns#"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:svg="http://www.w3.org/2000/svg"
xmlns="http://www.w3.org/2000/svg"
xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
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viewBox="0 0 210 297"
version="1.1"
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14
spec/lib/upload_creator_spec.rb
View File

@ -535,6 +535,20 @@ RSpec.describe UploadCreator do
end
end
describe "svg sizing" do
let(:svg_filename) { "pencil.svg" }
let(:svg_file) { file_from_fixtures(svg_filename) }
it "should handle units in width and height" do
upload = UploadCreator.new(svg_file, svg_filename,
force_optimize: true,
).create_for(user.id)
expect(upload.width).to be > 100
expect(upload.height).to be > 100
end
end
describe '#should_downsize?' do
context "GIF image" do
let(:gif_file) { file_from_fixtures("animated.gif") }