Sync with Picasa
================

Useful if you want to allow Picasa to be used as a front-end for 
managing image assets.

Lots still to todo, including:

 *  Get this working on EM Httpclient2. Currently using Mechanize
    for the SSL connection to fetch session cookie and Net:HTTP 
    for all api calls (due to the ease of setting authorisation 
    headers and http method). Mechanize is also used for fetching
    and saving files.
    Need to be able to configure EM client to use ssl, a goolge 
    auth header, application/atom+xml content-type and variable 
    http verbs (as dryly as possible).
 *  tests... hardly tested at all. Lots is probably broken!

This is just an initial version knocked together in a day or so
to fulfill a requirement, I will be adding to it over the next 
days and weeks.

Usage (api is likely to change):
=====

declare some constants:

[RAILS_ROOT]
PICASA_ASSETS_PATH = [sync'd images saved here]
GOOGLE_EMAIL = 
GOOGLE_PASS = 
GOOGLE_USER = 

Create a new album on Picasa and return its google id.

  album = Picasync::Album.new("Summer Holiday")
  album.create!
  puts album.api_id
 
  album = Picasync::Album.find_by_title("Summer Holiday")
  album.delete!


  albums = Picasync::Album.find(:all)

  
Include all photographs in find:

  albums = Picasync::Album.find(:all, :images)

Images included by default for id/title find:

  albums = Picasync::Album.find_by_title('title')
  albums = Picasync::Album.find_by_id(id)


Generate CSVs:

  Picasync::Sync::CSV.new
  
    produces two csvs linked by foreign key:
    (format has changed, both csvs now include picasa album/photo ids)

    albums.csv

      id,updated_at,title
      1|2008-02-29T15:57:42.000Z|Foo
      2|2008-02-29T10:52:51.000Z|Bar
  
    images.csv

      album_id,album_title,updated_on,tiny,small,medium,large [local file names hashed from Picasa uri]
      1|Foo|2008-02-29T15:57:42.000Z|dd7a4b8bc3a3.jpg|5a931bc7a07a.jpg|f5597e87ab07.jpg|ab441ebc79bc.jpg
      2|Bar|2008-02-29T15:42:34.000Z|ffc41b6bb103.jpg|a04e32a71876.jpg|a1945a821036.jpg|05dae39288c8.jpg
      2|Bar|2008-02-29T15:42:34.000Z|171195e2e0e9.jpg|849f7eefb72b.jpg|6316aa373cc5.jpg|146037f723de.jpg
      2|Bar|2008-02-29T15:42:34.000Z|d87b6d955b02.jpg|5f7f0d5e3960.jpg|239ce36ddc49.jpg|13e01b353904.jpg
      2|Bar|2008-02-29T15:42:34.000Z|f32130c1510a.jpg|b19c23e54f7d.jpg|5a350e4fdce2.jpg|6379545d4ef4.jpg   

Sync local with modified galleries on Picasa:

  Picasync::Sync::All.new

Various options to store images manually:   

  Picasync::Image.mirror(:all)
  Picasync::Image.mirror(:album, album.id)
  Picasync::Image.mirror(image.id, album.id)

Also:

  images = Picasync::Image.find(:all, album.id)
  image = Picasync::Image.find(img.id, album.id)
 
Loop through albums and print local file name and remote google path 
for medium-size version:
  
  albums = Picasync::Album.find(:all, :images)
  albums.each do |album|
    puts album.title
    album.images.each do |image|
      puts img.medium
      puts img.medium_uri
    end
  end