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Undo Wikipedia Blackout
(c) 2012 Alasdair Mercer
Freely distributable under the MIT license.
For all details and documentation:
http://neocotic.com/UndoWikipediaBlackout

 
             		           
                               
                            
                                
               
Private constants
             		                            
             		           
                               
                            
                                
               
Date ranges for known blackouts on Wikipedia.
             		                            
BLACKOUTS        = [
  start: new Date 2012, 0, 17, 0,  0,  0,  0
  end:   new Date 2012, 0, 19, 23, 59, 59, 999
]
             		           
                               
                            
                                
               
Extension ID being used by Undo Wikipedia Blackout.
             		                            
EXTENSION_ID     = utils.i18n '@@extension_id'
             		           
                               
                            
                                
               
Domain of Undo Wikipedia Blackout's homepage.
             		                            
HOMEPAGE_DOMAIN  = 'neocotic.com'
             		           
                               
                            
                                
               
Domain of Wikipedia.
             		                            
WIKIPEDIA_DOMAIN = 'wikipedia.org'
             		           
                               
                            
                                
               
Private variables
             		                            
             		           
                               
                            
                                
               
Current version of Undo Wikipedia Blackout.
             		                            
version = ''
             		           
                               
                            
                                
               
Private functions
             		                            
             		           
                               
                            
                                
               
Inject and execute the content scripts within all of the tabs (where
appropriate) of each Chrome window.
             		                            
executeScriptsInExistingWindows = ->
  chrome.windows.getAll null, (windows) ->
    for win in windows
             		           
                               
                            
                                
               
Retrieve all tabs open in win.
             		                            
      chrome.tabs.query windowId: win.id, (tabs) ->
        for tab in tabs
             		           
                               
                            
                                
               
Only execute blackout removal content scripts for tabs displaying a
page on Wikipedia's domain.
             		                            
          if tab.url.indexOf(WIKIPEDIA_DOMAIN) isnt -1
            chrome.tabs.executeScript tab.id, file: 'lib/content.js'
             		           
                               
                            
                                
               
Only execute inline installation content script for tabs displaying
a page on Undo Wikipedia Blackout's homepage domain.
             		                            
          if tab.url.indexOf(HOMEPAGE_DOMAIN) isnt -1
            chrome.tabs.executeScript tab.id, file: 'lib/install.js'
             		           
                               
                            
                                
               
Determine whether or not today falls within a known blackout for Wikipedia.
             		                            
isBlackoutToday = ->
  today = new Date()
  for range in BLACKOUTS
    return yes if today >= range.start and today <= range.end
  no
             		           
                               
                            
                                
               
Listener for internal requests to Undo Wikipedia Blackout.
             		                            
onRequest = (request, sender, sendResponse) ->
  switch request?.type
             		           
                               
                            
                                
               
Send some useful information back to the sender.
             		                            
    when 'info'
      sendResponse?(
        blackout: isBlackoutToday()
        id:       EXTENSION_ID
        version:  version
      )
             		           
                               
                            
                                
               
Show the page action if the request originated from a content script.
             		                            
    when 'show' then chrome.pageAction.show sender.tab.id if sender.tab
             		           
                               
                            
                                
               
Background page setup
             		                            
ext = window.ext =
             		           
                               
                            
                                
               
Public functions
             		                            
             		           
                               
                            
                                
               
Initialize the background page. 

This will involve initializing the settings and adding the request
listeners.
             		                            
  init: ->
    utils.init 'log', off
             		           
                               
                            
                                
               
Add listeners for internal requests.
             		                            
    chrome.extension.onRequest.addListener onRequest
             		           
                               
                            
                                
               
It's nice knowing what version is running.
             		                            
    req = new XMLHttpRequest()
    req.open 'GET', chrome.extension.getURL('manifest.json'), yes
    req.onreadystatechange = ->
      if req.readyState is 4
        data    = JSON.parse req.responseText
        version = data.version
             		           
                               
                            
                                
               
Execute content scripts now that we know the version.
             		                            
        executeScriptsInExistingWindows()
    req.send()