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# frozen_string_literal: true
require 'rdoc'
require 'erb'
require 'time'
require 'json'
require 'webrick'
##
# This is a WEBrick servlet that allows you to browse ri documentation.
#
# You can show documentation through either `ri --server` or, with RubyGems
# 2.0 or newer, `gem server`. For ri, the server runs on port 8214 by
# default. For RubyGems the server runs on port 8808 by default.
#
# You can use this servlet in your own project by mounting it on a WEBrick
# server:
#
# require 'webrick'
#
# server = WEBrick::HTTPServer.new Port: 8000
#
# server.mount '/', RDoc::Servlet
#
# If you want to mount the servlet some other place than the root, provide the
# base path when mounting:
#
# server.mount '/rdoc', RDoc::Servlet, '/rdoc'
class RDoc::Servlet < WEBrick::HTTPServlet::AbstractServlet
@server_stores = Hash.new { |hash, server| hash[server] = {} }
@cache = Hash.new { |hash, store| hash[store] = {} }
##
# Maps an asset type to its path on the filesystem
attr_reader :asset_dirs
##
# An RDoc::Options instance used for rendering options
attr_reader :options
##
# Creates an instance of this servlet that shares cached data between
# requests.
def self.get_instance server, *options # :nodoc:
stores = @server_stores[server]
new server, stores, @cache, *options
end
##
# Creates a new WEBrick servlet.
#
# Use +mount_path+ when mounting the servlet somewhere other than /.
#
# Use +extra_doc_dirs+ for additional documentation directories.
#
# +server+ is provided automatically by WEBrick when mounting. +stores+ and
# +cache+ are provided automatically by the servlet.
def initialize server, stores, cache, mount_path = nil, extra_doc_dirs = []
super server
@cache = cache
@mount_path = mount_path
@extra_doc_dirs = extra_doc_dirs
@stores = stores
@options = RDoc::Options.new
@options.op_dir = '.'
darkfish_dir = nil
# HACK dup
$LOAD_PATH.each do |path|
darkfish_dir = File.join path, 'rdoc/generator/template/darkfish/'
next unless File.directory? darkfish_dir
@options.template_dir = darkfish_dir
break
end
@asset_dirs = {
:darkfish => darkfish_dir,
:json_index =>
File.expand_path('../generator/template/json_index/', __FILE__),
}
end
##
# Serves the asset at the path in +req+ for +generator_name+ via +res+.
def asset generator_name, req, res
asset_dir = @asset_dirs[generator_name]
asset_path = File.join asset_dir, req.path
if_modified_since req, res, asset_path
res.body = File.read asset_path
res.content_type = case req.path
when /css$/ then 'text/css'
when /js$/ then 'application/javascript'
else 'application/octet-stream'
end
end
##
# GET request entry point. Fills in +res+ for the path, etc. in +req+.
def do_GET req, res
req.path.sub!(/^#{Regexp.escape @mount_path}/o, '') if @mount_path
case req.path
when '/' then
root req, res
when '/js/darkfish.js', '/js/jquery.js', '/js/search.js',
%r%^/css/%, %r%^/images/%, %r%^/fonts/% then
asset :darkfish, req, res
when '/js/navigation.js', '/js/searcher.js' then
asset :json_index, req, res
when '/js/search_index.js' then
root_search req, res
else
show_documentation req, res
end
rescue WEBrick::HTTPStatus::NotFound => e
generator = generator_for RDoc::Store.new
not_found generator, req, res, e.message
rescue WEBrick::HTTPStatus::Status
raise
rescue => e
error e, req, res
end
##
# Fills in +res+ with the class, module or page for +req+ from +store+.
#
# +path+ is relative to the mount_path and is used to determine the class,
# module or page name (/RDoc/Servlet.html becomes RDoc::Servlet).
# +generator+ is used to create the page.
def documentation_page store, generator, path, req, res
name = path.sub(/.html$/, '').gsub '/', '::'
if klass = store.find_class_or_module(name) then
res.body = generator.generate_class klass
elsif page = store.find_text_page(name.sub(/_([^_]*)$/, '.\1')) then
res.body = generator.generate_page page
else
not_found generator, req, res
end
end
##
# Creates the JSON search index on +res+ for the given +store+. +generator+
# must respond to \#json_index to build. +req+ is ignored.
def documentation_search store, generator, req, res
json_index = @cache[store].fetch :json_index do
@cache[store][:json_index] =
JSON.dump generator.json_index.build_index
end
res.content_type = 'application/javascript'
res.body = "var search_data = #{json_index}"
end
##
# Returns the RDoc::Store and path relative to +mount_path+ for
# documentation at +path+.
def documentation_source path
_, source_name, path = path.split '/', 3
store = @stores[source_name]
return store, path if store
store = store_for source_name
store.load_all
@stores[source_name] = store
return store, path
end
##
# Generates an error page for the +exception+ while handling +req+ on +res+.
def error exception, req, res
backtrace = exception.backtrace.join "\n"
res.content_type = 'text/html'
res.status = 500
res.body = <<-BODY
<!DOCTYPE html>
<html>
<head>
<meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
<title>Error - #{ERB::Util.html_escape exception.class}</title>
<link type="text/css" media="screen" href="#{@mount_path}/css/rdoc.css" rel="stylesheet">
</head>
<body>
<h1>Error</h1>
<p>While processing <code>#{ERB::Util.html_escape req.request_uri}</code> the
RDoc (#{ERB::Util.html_escape RDoc::VERSION}) server has encountered a
<code>#{ERB::Util.html_escape exception.class}</code>
exception:
<pre>#{ERB::Util.html_escape exception.message}</pre>
<p>Please report this to the
<a href="https://github.com/ruby/rdoc/issues">RDoc issues tracker</a>. Please
include the RDoc version, the URI above and exception class, message and
backtrace. If you're viewing a gem's documentation, include the gem name and
version. If you're viewing Ruby's documentation, include the version of ruby.
<p>Backtrace:
<pre>#{ERB::Util.html_escape backtrace}</pre>
</body>
</html>
BODY
end
##
# Instantiates a Darkfish generator for +store+
def generator_for store
generator = RDoc::Generator::Darkfish.new store, @options
generator.file_output = false
generator.asset_rel_path = '..'
rdoc = RDoc::RDoc.new
rdoc.store = store
rdoc.generator = generator
rdoc.options = @options
@options.main_page = store.main
@options.title = store.title
generator
end
##
# Handles the If-Modified-Since HTTP header on +req+ for +path+. If the
# file has not been modified a Not Modified response is returned. If the
# file has been modified a Last-Modified header is added to +res+.
def if_modified_since req, res, path = nil
last_modified = File.stat(path).mtime if path
res['last-modified'] = last_modified.httpdate
return unless ims = req['if-modified-since']
ims = Time.parse ims
unless ims < last_modified then
res.body = ''
raise WEBrick::HTTPStatus::NotModified
end
end
##
# Returns an Array of installed documentation.
#
# Each entry contains the documentation name (gem name, 'Ruby
# Documentation', etc.), the path relative to the mount point, whether the
# documentation exists, the type of documentation (See RDoc::RI::Paths#each)
# and the filesystem to the RDoc::Store for the documentation.
def installed_docs
extra_counter = 0
ri_paths.map do |path, type|
store = RDoc::Store.new path, type
exists = File.exist? store.cache_path
case type
when :gem then
gem_path = path[%r%/([^/]*)/ri$%, 1]
[gem_path, "#{gem_path}/", exists, type, path]
when :system then
['Ruby Documentation', 'ruby/', exists, type, path]
when :site then
['Site Documentation', 'site/', exists, type, path]
when :home then
['Home Documentation', 'home/', exists, type, path]
when :extra then
extra_counter += 1
store.load_cache if exists
title = store.title || "Extra Documentation"
[title, "extra-#{extra_counter}/", exists, type, path]
end
end
end
##
# Returns a 404 page built by +generator+ for +req+ on +res+.
def not_found generator, req, res, message = nil
message ||= "The page <kbd>#{ERB::Util.h req.path}</kbd> was not found"
res.body = generator.generate_servlet_not_found message
res.status = 404
end
##
# Enumerates the ri paths. See RDoc::RI::Paths#each
def ri_paths &block
RDoc::RI::Paths.each true, true, true, :all, *@extra_doc_dirs, &block #TODO: pass extra_dirs
end
##
# Generates the root page on +res+. +req+ is ignored.
def root req, res
generator = RDoc::Generator::Darkfish.new nil, @options
res.body = generator.generate_servlet_root installed_docs
res.content_type = 'text/html'
end
##
# Generates a search index for the root page on +res+. +req+ is ignored.
def root_search req, res
search_index = []
info = []
installed_docs.map do |name, href, exists, type, path|
next unless exists
search_index << name
case type
when :gem
gemspec = path.gsub(%r%/doc/([^/]*?)/ri$%,
'/specifications/\1.gemspec')
spec = Gem::Specification.load gemspec
path = spec.full_name
comment = spec.summary
when :system then
path = 'ruby'
comment = 'Documentation for the Ruby standard library'
when :site then
path = 'site'
comment = 'Documentation for non-gem libraries'
when :home then
path = 'home'
comment = 'Documentation from your home directory'
when :extra
comment = name
end
info << [name, '', path, '', comment]
end
index = {
:index => {
:searchIndex => search_index,
:longSearchIndex => search_index,
:info => info,
}
}
res.body = "var search_data = #{JSON.dump index};"
res.content_type = 'application/javascript'
end
##
# Displays documentation for +req+ on +res+, whether that be HTML or some
# asset.
def show_documentation req, res
store, path = documentation_source req.path
if_modified_since req, res, store.cache_path
generator = generator_for store
case path
when nil, '', 'index.html' then
res.body = generator.generate_index
when 'table_of_contents.html' then
res.body = generator.generate_table_of_contents
when 'js/search_index.js' then
documentation_search store, generator, req, res
else
documentation_page store, generator, path, req, res
end
ensure
res.content_type ||= 'text/html'
end
##
# Returns an RDoc::Store for the given +source_name+ ('ruby' or a gem name).
def store_for source_name
case source_name
when 'home' then
RDoc::Store.new RDoc::RI::Paths.home_dir, :home
when 'ruby' then
RDoc::Store.new RDoc::RI::Paths.system_dir, :system
when 'site' then
RDoc::Store.new RDoc::RI::Paths.site_dir, :site
when /^extra-(\d+)$/ then
index = $1.to_i - 1
ri_dir = installed_docs[index][4]
RDoc::Store.new ri_dir, :extra
else
ri_dir, type = ri_paths.find do |dir, dir_type|
next unless dir_type == :gem
source_name == dir[%r%/([^/]*)/ri$%, 1]
end
raise WEBrick::HTTPStatus::NotFound,
"Could not find gem \"#{ERB::Util.html_escape(source_name)}\". Are you sure you installed it?" unless ri_dir
store = RDoc::Store.new ri_dir, type
return store if File.exist? store.cache_path
raise WEBrick::HTTPStatus::NotFound,
"Could not find documentation for \"#{ERB::Util.html_escape(source_name)}\". Please run `gem rdoc --ri gem_name`"
end
end
end
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