309 lines
9.3 KiB
Ruby
309 lines
9.3 KiB
Ruby
# plemp.rb - The Plemp! application, create your own on-line pile of junk!
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#
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# Plemp! is Copyright © 2010 Paul van Tilburg <paul@luon.net>
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#
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# This program is free software; you can redistribute it and/or modify it under
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# the terms of the GNU General Public License as published by the Free Software
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# Foundation; either version 2 of the License, or (at your option) any later
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# version.
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require "active_record"
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require "camping"
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require "coderay"
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require "fileutils"
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require "json"
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require "markaby"
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require "mime/types"
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require "pathname"
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Camping.goes :Plemp
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# We want (somewhat) indent HTML to be produced.
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Markaby::Builder.set(:indent, 2)
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# Global variables.
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unless defined? BASE_DIR
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BASE_DIR = Pathname.new(__FILE__).dirname
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PUBLIC_DIR = BASE_DIR + "public"
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UPLOAD_DIR = BASE_DIR + "upload"
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Program = "Plemp!"
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Version = "0.1"
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end
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# = The Plemp module
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module Plemp
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# Calls methods at application creation/setup time.
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def self.create
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Plemp::Models.create_schema
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end
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end
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# = The Plemp models
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module Plemp::Models
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# = The draggable model class
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#
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# This class represents an draggable object attached to an uploaded
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# file.
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class Draggable < Base
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end
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# = The basic fields class
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#
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# Class that connects model classes to database tables.
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class BasicFields < V 1.0
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def self.up
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create_table Draggable.table_name do |d|
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d.string :file
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d.integer :left, :top, :z_index
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# This gives us created_at and updated_at.
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d.timestamps
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end
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end
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def self.down
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drop_table Draggable.table_name
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end
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end
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end # module Plemp::Models
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# = The Plemp controllers
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module Plemp::Controllers
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# = The index controller
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#
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# Main controller that shows the canvas with the draggable objects.
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#
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# path:: /
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# view:: Views#main
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class Index
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# Retrieves all draggables and renders the main view.
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def get
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@draggables = Draggable.all
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render :main
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end
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end
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# = The current controller
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#
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# Controller accessed through AJAX requests by the main page for getting
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# the current (global) state (position) of the draggables.
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#
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# path:: /current
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# view:: N/A
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class Current
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# Retrieves all draggables with there top/left position and returns
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# an Hash in JSON format.
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def get
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out = Hash.new
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Draggable.all.each { |d| out[d.file] = [d.left, d.top] }
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$stderr.puts("Current status requested: #{out.to_json}")
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out.to_json
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end
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end
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# = The position save controller
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#
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# Controller used through AJAX request by the main page for committing
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# position changes of the draggables to the database, i.e. the global
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# state.
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#
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# path:: /savepos/<id>/<top>/<left>
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# view:: N/A
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class SaveposXXX
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# Retrieves the draggable _file_ from the database and updates its
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# _top_ and _left_ position.
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def post(file, top, left)
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[top, left].each { |pos| pos.gsub!(/px$/, '') }
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$stderr.puts("Got: file id: #{file} -> top: #{top}, left: #{left}")
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drag = Draggable.find_by_file(file)
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drag.top = top
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drag.left = left
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drag.save
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""
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end
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end
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# = The static controller
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#
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# Controller to serve static data from either the public or upload
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# subdirectory using X-Sendfile.
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#
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# path:: /static/(public,upload)/<file>
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# view:: N/A (X-Sendfile)
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class StaticXX
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# Determines the MIME type of the file referenced by _path_ and sets
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# the suitable headers and X-Sendfile header. The _type_ can be either
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# _public_ if the file came with Plemp!, or _upload_ if the file was
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# once uploaded to Plemp!.
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def get(type, path)
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mime_type = MIME::Types.type_for(path).first
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@headers['Content-Type'] = mime_type.nil? ? "text/plain" : mime_type.to_s
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unless path.include? ".." or not ["public", "upload"].include? type
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@headers['X-Sendfile'] = (BASE_DIR + type + path).to_s
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else
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@status = "403"
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"Error 403: Invalid path: #{path}"
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end
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end
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end
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# = The upload controller
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#
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# Controller to handle uploads from the main site. This can either
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# be a file or some pasted text. After upload the controler redirects
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# to the main page which includes the just uploaded file.
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#
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# path:: /upload
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# redirect:: Index
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class Upload
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# Creates a text file from input text or otherise from the supplied
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# uploaded temp file. The file name is base on the current timestamp
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# plus the appropriate extension. Also creates an Draggable object in
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# the database.
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def post
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# TODO: store the MIME type in the database!
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# TODO: in case of text + filename, commit both.
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if @input.text.empty?
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# Text input has priority over file uploads.
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orig_ext = File.extname(@input.file[:filename]).downcase
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file_base = Time.now.strftime("%Y%m%d%H%M%S#{orig_ext}")
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contents = @input.file[:tempfile].read
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else
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file_base = Time.now.strftime("%Y%m%d%H%M%S.txt")
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contents = @input.text.chomp + "\n"
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end
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new_file = UPLOAD_DIR + file_base
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new_file.open("w") do |f|
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f.write(contents)
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end
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Draggable.create(:file => file_base,
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:left => 350, :top => 200, :z_index => 0)
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redirect Index
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end
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end
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end # module Plemp::Controllers
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# The Plemp views
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module Plemp::Views
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# The main layout used by Controllers::*#render. Loads the appropriate
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# style and JavaScript files.
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def layout
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xhtml_strict do
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head do
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title "Plemp!"
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link :rel => "stylesheet", :type => "text/css",
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:media => "screen", :href => R(StaticXX, "public", "plemp.css")
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['prototype', 'scriptaculous', 'dragreg'].each do |js|
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script :src => R(StaticXX, "public", "#{js}.js"),
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:type => "text/javascript"
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end
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script :type => "text/javascript" do
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"init_plemp();"
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end
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end
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# TODO: move this to init_plemp()?
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body(:onLoad => "return setup_draggables();") do
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self << yield
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end
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end
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end
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# The main view. Shows the header, the (hidden) add_dialog and the
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# cavnas with the draggable objects.
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def main
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div.header! do
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h1 do
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div.title! { span Program; span.subtitle! "v#{Version}" }
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div.add!(:onClick => "show_add_dialog(); return false;") { "+" }
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end
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end
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add_dialog
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draggables
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end
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# The add dialog. A hidden dialog only shown when the Plus button/key
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# is used. Uses Controllers::Upload to upload a file or pasted text.
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def add_dialog
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div.add_dialog!(:style => "display:none;") do
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div.background {}
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form :action => R(Upload), :method => "post", :id => "add_form",
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:enctype => "multipart/form-data" do
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h2 "Plemp it!"
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p "Scribble something below:"
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textarea :name => "text", :id => "text", :cols => 60, :rows => 12
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p do
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span "… or upload a file:"
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input :name => "file", :id => "file", :type => "file"
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end
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div.right do
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input :type => "button", :value => "Cancel",
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:onClick => "hide_add_dialog(); return false;"
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input :type => "submit", :value => "Upload!"
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end
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end
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end
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end
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# The canvas with draggables. Creates a draggable HTML element including
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# the actually contents of the associated file per Draggable object in
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# the database.
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def draggables
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div.draggables! do
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@draggables.each do |d|
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file = UPLOAD_DIR + d.file
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unless file.exist?
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# The associated file of this Draggable object is gone, remove
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# the object from the database too.
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d.destroy
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next
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end
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# Determine the MIME type.
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file_type = `file --brief --mime-type #{file}`.chomp
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mime_type = MIME::Types[file_type].first
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if mime_type.nil?
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mime_type = MIME::Type.new(file_type)
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end
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# Create an HTML element based on the type of the Draggable object.
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default_style = "left:#{d.left}px;top:#{d.top}px;z-index:0;display:none"
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case mime_type.media_type
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when "image"
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img.draggable :id => d.file, :style => default_style,
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:src => R(StaticXX, "upload", file.basename),
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:alt => file.basename
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when "video"
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# HTML5 is not supported by Markaby!
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self << \
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" <video class=\"draggable\" id=\"#{d.file}\" " +
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"style=\"#{default_style}\" " +
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"src=\"#{R(StaticXX, "upload", d.file)}\" " +
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"controls=\"true\">" + "</video>\n"
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when "audio"
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# HTML5 is not supported by Markaby!
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self <<
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" <audio class=\"draggable\" id=\"#{d.file}\" " +
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"style=\"#{default_style};height=80px;\" " +
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"src=\"#{R(StaticXX, "upload", d.file)}\" " +
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"controls=\"true\">" + "</audio>\n"
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when "text"
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div.draggable :id => d.file, :style => default_style do
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CodeRay.scan_file(file).div(:tab_width => 2,
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:line_numbers => :inline)
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end
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else
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span.draggable :id => d.file, :style => default_style do
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em "#{d.file}: Unsupported file type!"
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end
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end # case
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end
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end
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end # def draggables
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end # module Plemp::Views
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