Class: Onesie

Inherits:
Object
  • Object
show all
Defined in:
lib/onesie.rb

Overview

For any request path that doesn’t match options[:path], immediately redirect to #{options[:path]}/#/#{request-path} after dropping the original request path in the session. For any request that comes in, matches options[:path], and has a request-path in the session, rewrite the request to match the path info in the session, remove the session copy, and allow the app to route/handle as normal.

Constant Summary collapse

VERSION =

Duh.

"1.0.0"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app, options = {}) ⇒ Onesie

Create a new instance of this middleware. app (required) is the Rack application we’re wrapping. Valid options:

:except  # An Array of prefix strings or Regexps to ignore.
:log     # A lambda for logging, takes one message arg.
:only    # An array of prefix strings or Regexps to require.
:path    # The correct path for the one-page app. Default: "/"



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# File 'lib/onesie.rb', line 26

def initialize app, options = {}
  @app    = app
  @except = Array(options[:except]).map { |e| regexpify e }
  @log    = options[:log]
  @only   = Array(options[:only]).map   { |o| regexpify o }
  @path   = options[:path] || "/"

  if FalseClass === @log
    @log = lambda { |m| }
  elsif !@log
    if defined? Rails
      @log = lambda { |m| Rails.logger.info "  [Onesie] #{m}" }
    else
      @log = lambda { |m| puts "[Onesie] #{m}" }
    end
  end
end

Instance Attribute Details

#except ⇒ Object (readonly)

Returns the value of attribute except.



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# File 'lib/onesie.rb', line 16

def except
  @except
end

#only ⇒ Object (readonly)

Returns the value of attribute only.



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# File 'lib/onesie.rb', line 16

def only
  @only
end

#path ⇒ Object (readonly)

Returns the value of attribute path.



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# File 'lib/onesie.rb', line 16

def path
  @path
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/onesie.rb', line 44

def call env
  request = Rack::Request.new env
  session = env["rack.session"]

  session.delete "onesie.path" if /onesie.clear/ =~ env["REQUEST_URI"]

  allowed = only.empty? || only.any? { |o| o =~ request.path_info }
  denied  = except.any? { |e| e =~ request.path_info }

  return @app.call env if request.xhr? || !allowed || denied

  if request.path_info == @path
    path = session.delete("onesie.path") || "/"
    old_path_info = request.path_info

    env["PATH_INFO"] = env["onesie.path"] = path
    env["REQUEST_URI"].sub!(/^#{old_path_info}/, path)

    @log.call "actual path is #{path}"
    return @app.call env
  end

  session["onesie.path"] = dest = request.path_info
  request.path_info = @path
  request.path_info << "/" unless "/" == request.path_info[-1, 1]

  dest = request.url + "##{dest}"
  @log.call "redirecting to #{dest}"

  [302, { "Location" => dest }, "Redirecting."]
end