discourse/app/controllers/metadata_controller.rb

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class MetadataController < ApplicationController
layout false
skip_before_action :preload_json, :check_xhr, :redirect_to_login_if_required
def manifest
render json: default_manifest.to_json, content_type: 'application/manifest+json'
end
def opensearch
render file: "#{Rails.root}/app/views/metadata/opensearch.xml"
end
private
def default_manifest
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logo = SiteSetting.site_large_icon_url.presence ||
SiteSetting.site_logo_small_url.presence ||
SiteSetting.site_apple_touch_icon_url.presence
if !logo
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logo = '/images/d-logo-sketch-small.png'
end
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file_info = get_file_info(logo)
display = Regexp.new(SiteSetting.pwa_display_browser_regex).match(request.user_agent) ? 'browser' : 'standalone'
manifest = {
name: SiteSetting.title,
display: display,
start_url: Discourse.base_uri.present? ? "#{Discourse.base_uri}/" : '.',
background_color: "##{ColorScheme.hex_for_name('secondary', view_context.scheme_id)}",
theme_color: "##{ColorScheme.hex_for_name('header_background', view_context.scheme_id)}",
icons: [
{
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src: UrlHelper.absolute(logo),
sizes: file_info[:size],
type: file_info[:type]
}
],
share_target: {
action: "/new-topic",
params: {
title: "title",
text: "body"
}
}
}
manifest[:short_name] = SiteSetting.short_title if SiteSetting.short_title.present?
if SiteSetting.native_app_install_banner
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manifest = manifest.merge(
prefer_related_applications: true,
related_applications: [
{
platform: "play",
id: "com.discourse"
}
]
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)
end
manifest
end
def get_file_info(filename)
type = MiniMime.lookup_by_filename(filename)&.content_type || "image/png"
upload = Upload.find_by_url(filename)
{ size: "#{upload&.width || 512}x#{upload&.height || 512}", type: type }
end
end