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e2f9b7dd6f
There are at least two ways of rendering templates outside of the controller. The first one is Rails way enabled with Rails 5 https://evilmartians.com/chronicles/new-feature-in-rails-5-render-views-outside-of-actions The downside of this method is that all variables need to be passed as params (I could find a way to pass the whole context) Another way is to use instance_eval described in Erubi documentation https://github.com/jeremyevans/erubi#usage - it works perfectly fine, however, I didn't feel very confident about using eval unless necessary. An additional benefit of using `ApplicationController.render` is that if Rails would change the ERB engine in the future, this code should still work. If you want to test it on your local, you need to be signed in and then that two URLs are generating certificates: http://localhost:3000/discobot/certificate.svg?date=Oct+07+2019&type=standard&user_id=1 http://localhost:3000/discobot/certificate.svg?date=Oct+07+2019&type=advanced&user_id=1 Dev: https://dev.discourse.org/t/discourse-narrative-bot-should-not-be-storing-giant-strings/17130
93 lines
2.8 KiB
Ruby
93 lines
2.8 KiB
Ruby
# frozen_string_literal: true
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module DiscourseNarrativeBot
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class CertificateGenerator
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def initialize(user, date)
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@user = user
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date =
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begin
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Date.parse(date)
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rescue ArgumentError => e
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if e.message == 'invalid date'
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Date.parse(Date.today.to_s)
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else
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raise e
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end
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end
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@date = I18n.l(date, format: :date_only)
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@discobot_user = User.find(-2)
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end
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def new_user_track
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width = 538.583 # Default width for the SVG
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ApplicationController.render(inline: File.read(File.expand_path('../templates/new_user.svg.erb', __FILE__)),
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assigns: { width: width,
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discobot_user: @discobot_user,
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date: @date,
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avatar_url: base64_image_link(avatar_url),
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logo_group: logo_group(55, width, 350),
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name: name })
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end
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def advanced_user_track
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width = 722.8 # Default width for the SVG
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ApplicationController.render(inline: File.read(File.expand_path('../templates/advanced_user.svg.erb', __FILE__)),
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assigns: { width: width,
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discobot_user: @discobot_user,
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date: @date,
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avatar_url: base64_image_link(avatar_url),
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logo_group: logo_group(40, width, 280),
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name: name })
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end
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private
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def name
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@user.username.titleize
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end
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def logo_group(size, width, height)
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return unless SiteSetting.site_logo_small_url.present?
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begin
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uri = URI(SiteSetting.site_logo_small_url)
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logo_uri =
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if uri.host.blank? || uri.scheme.blank?
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URI("#{Discourse.base_url}/#{uri.path}")
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else
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uri
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end
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<<~URL
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<g transform="translate(#{width / 2 - (size / 2)} #{height})">
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<image height="#{size}px" width="#{size}px" #{base64_image_link(logo_uri)}/>
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</g>
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URL
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rescue URI::InvalidURIError
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''
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end
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end
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def base64_image_link(url)
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if image = fetch_image(url)
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"xlink:href=\"data:image/png;base64,#{Base64.strict_encode64(image)}\""
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else
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""
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end
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end
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def fetch_image(url)
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URI(url).open('rb', redirect: true, allow_redirections: :all).read
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rescue OpenURI::HTTPError
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# Ignore if fetching image returns a non 200 response
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end
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def avatar_url
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UrlHelper.absolute(Discourse.base_uri + @user.avatar_template.gsub('{size}', '250'))
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end
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end
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end
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