discourse/lib/plugin/instance.rb

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5.9 KiB
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require 'digest/sha1'
require 'fileutils'
require_dependency 'plugin/metadata'
require_dependency 'plugin/auth_provider'
class Plugin::Instance
attr_reader :auth_providers, :assets
attr_accessor :path, :metadata
def self.find_all(parent_path)
[].tap { |plugins|
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# also follows symlinks - http://stackoverflow.com/q/357754
Dir["#{parent_path}/**/*/**/plugin.rb"].each do |path|
source = File.read(path)
metadata = Plugin::Metadata.parse(source)
plugins << self.new(metadata, path)
end
}
end
def initialize(metadata=nil, path=nil)
@metadata = metadata
@path = path
@assets = []
end
def name
metadata.name
end
# will make sure all the assets this plugin needs are registered
def generate_automatic_assets!
paths = []
automatic_assets.each do |path, contents|
unless File.exists? path
ensure_directory path
File.open(path,"w") do |f|
f.write(contents)
end
end
paths << path
end
delete_extra_automatic_assets(paths)
paths
end
def delete_extra_automatic_assets(good_paths)
return unless Dir.exists? auto_generated_path
filenames = good_paths.map{|f| File.basename(f)}
# nuke old files
Dir.foreach(auto_generated_path) do |p|
next if [".", ".."].include?(p)
next if filenames.include?(p)
File.delete(auto_generated_path + "/#{p}")
end
end
def ensure_directory(path)
dirname = File.dirname(path)
unless File.directory?(dirname)
FileUtils.mkdir_p(dirname)
end
end
def auto_generated_path
File.dirname(path) << "/auto_generated"
end
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def after_initialize(&block)
@after_initialize ||= []
@after_initialize << block
end
def notify_after_initialize
if @after_initialize
@after_initialize.each do |callback|
callback.call
end
end
end
def register_css(style)
@styles ||= []
@styles << style
end
def register_javascript(js)
@javascripts ||= []
@javascripts << js
end
def register_asset(file,opts=nil)
full_path = File.dirname(path) << "/assets/" << file
assets << full_path
if opts == :server_side
@server_side_javascripts ||= []
@server_side_javascripts << full_path
end
end
def automatic_assets
css = ""
js = ""
css = @styles.join("\n") if @styles
js = @javascripts.join("\n") if @javascripts
unless auth_providers.blank?
auth_providers.each do |auth|
overrides = ""
overrides = ", titleOverride: '#{auth.title}'" if auth.title
overrides << ", messageOverride: '#{auth.message}'" if auth.message
overrides << ", frameWidth: '#{auth.frame_width}'" if auth.frame_width
overrides << ", frameHeight: '#{auth.frame_height}'" if auth.frame_height
js << "Discourse.LoginMethod.register(Discourse.LoginMethod.create({name: '#{auth.name}'#{overrides}}));\n"
if auth.glyph
css << ".btn-social.#{auth.name}:before{ content: '#{auth.glyph}'; }\n"
end
if auth.background_color
css << ".btn-social.#{auth.name}{ background: #{auth.background_color}; }\n"
end
end
end
# Generate an IIFE for the JS
js = "(function(){#{js}})();" if js.present?
result = []
result << [css, 'css'] if css.present?
result << [js, 'js'] if js.present?
result.map do |asset, extension|
hash = Digest::SHA1.hexdigest asset
["#{auto_generated_path}/plugin_#{hash}.#{extension}", asset]
end
end
# note, we need to be able to parse seperately to activation.
# this allows us to present information about a plugin in the UI
# prior to activations
def activate!
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self.instance_eval File.read(path), path
if auto_assets = generate_automatic_assets!
assets.concat auto_assets
end
unless assets.blank?
assets.each do |asset|
if asset =~ /\.js$|.js.erb$/
DiscoursePluginRegistry.javascripts << asset
elsif asset =~ /\.css$|\.scss$/
DiscoursePluginRegistry.stylesheets << asset
end
end
# TODO possibly amend this to a rails engine
Rails.configuration.assets.paths << auto_generated_path
Rails.configuration.assets.paths << File.dirname(path) + "/assets"
end
if @server_side_javascripts
@server_side_javascripts.each do |js|
DiscoursePluginRegistry.server_side_javascripts << js
end
end
public_data = File.dirname(path) + "/public"
if Dir.exists?(public_data)
target = Rails.root.to_s + "/public/plugins/"
`mkdir -p #{target}`
target << name
# TODO a cleaner way of registering and unregistering
`rm -f #{target}`
`ln -s #{public_data} #{target}`
end
end
def auth_provider(opts)
@auth_providers ||= []
provider = Plugin::AuthProvider.new
[:glyph, :background_color, :title, :message, :frame_width, :frame_height, :authenticator].each do |sym|
provider.send "#{sym}=", opts.delete(sym)
end
@auth_providers << provider
end
# shotgun approach to gem loading, in future we need to hack bundler
# to at least determine dependencies do not clash before loading
#
# Additionally we want to support multiple ruby versions correctly and so on
#
# This is a very rough initial implementation
def gem(name, version, opts = {})
gems_path = File.dirname(path) + "/gems/#{RUBY_VERSION}"
spec_path = gems_path + "/specifications"
spec_file = spec_path + "/#{name}-#{version}.gemspec"
unless File.exists? spec_file
command = "gem install #{name} -v #{version} -i #{gems_path} --no-rdoc --no-ri"
puts command
puts `#{command}`
end
if File.exists? spec_file
spec = Gem::Specification.load spec_file
spec.activate
unless opts[:require] == false
require name
end
else
puts "You are specifying the gem #{name} in #{path}, however it does not exist!"
exit(-1)
end
end
end