oembed mostly works

app/controllers/posts_controller.rb

@@ -7,7 +7,7 @@ require Rails.root.join("app", "presenters", "post_presenter")
 class PostsController < ApplicationController
   include PostsHelper
   
-  before_filter :authenticate_user!, :except => [:show, :iframe]
+  before_filter :authenticate_user!, :except => [:show, :iframe, :oembed]
   before_filter :set_format_if_malformed_from_status_net, :only => :show
 
   layout 'post'
@@ -24,13 +24,7 @@ class PostsController < ApplicationController
   end
 
   def show
-    key = params[:id].to_s.length <= 8 ? :id : :guid
-
-    if user_signed_in?
-      @post = current_user.find_visible_shareable_by_id(Post, params[:id], :key => key)
-    else
-      @post = Post.where(key => params[:id], :public => true).includes(:author, :comments => :author).first
-    end
+    @post = find_by_guid_or_id_with_current_user(params[:id])
 
     if @post
       # @commenting_disabled = can_not_comment_on_post?
@@ -59,6 +53,13 @@ class PostsController < ApplicationController
     render :text => post_iframe_url(params[:id]), :layout => false
   end
 
+  def oembed
+    post_id = OEmbedPresenter.id_from_url(params.delete(:url))
+    post = find_by_guid_or_id_with_current_user(post_id) 
+    oembed = OEmbedPresenter.new(post, params.slice(:format, :maxheight, :minheight))
+    render :json => oembed
+  end
+
   def destroy
     @post = current_user.posts.where(:id => params[:id]).first
     if @post
@@ -76,6 +77,16 @@ class PostsController < ApplicationController
 
   private
 
+  def find_by_guid_or_id_with_current_user(id)
+    key = id.to_s.length <= 8 ? :id : :guid
+    if user_signed_in?
+      current_user.find_visible_shareable_by_id(Post, id, :key => key)
+    else
+      Post.where(key => id, :public => true).includes(:author, :comments => :author).first
+    end
+
+  end
+
   def set_format_if_malformed_from_status_net
    request.format = :html if request.format == 'application/html+xml'
   end

app/helpers/posts_helper.rb

@@ -20,6 +20,6 @@ module PostsHelper
   def post_iframe_url(post_id, opts={})
     opts[:width] ||= 516
     opts[:height] ||= 315 
-   "<iframe src='#{Rails.application.routes.url_helpers.post_url(post_id)}' width='#{opts[:width]}px' height='#{opts[:height]}px' frameBorder='0'></iframe>".html_safe
+   "<iframe src='#{Rails.application.routes.url_helpers.post_url(post_id, :host => AppConfig[:pod_uri].host)}' width='#{opts[:width]}px' height='#{opts[:height]}px' frameBorder='0'></iframe>".html_safe
   end
 end

app/presenters/o_embed_presenter.rb

@@ -1,5 +1,7 @@
+require 'uri'
 class OEmbedPresenter
   include PostsHelper
+  include ActionView::Helpers::TextHelper
 
   def initialize(post, opts = {})
     @post = post
@@ -10,24 +12,27 @@ class OEmbedPresenter
     as_json(opts).to_json
   end
 
-  def as_json(opts)
+  def as_json(opts={})
     {
       :provider_name => "Diaspora", 
       :provider_url => AppConfig[:pod_url],
+      :type => 'rich',
       :version => '1.0',
       :title => post_title,
       :author_name => post_author,
       :author_url => post_author_url,
-      :width => @opts.fetch(:height, 516), 
-      :height => @opts.fetch(:width, 320),
+      :width => @opts.fetch(:maxwidth, 516), 
+      :height => @opts.fetch(:maxheight, 320),
       :html => iframe_html
     }
   end
 
-  private
+  def self.id_from_url(url)
+    URI.parse(url).path.gsub(%r{\/posts\/|\/p\/}, '')
+  end
 
   def post_title
-    @post.text
+    post_page_title(@post)
   end
 
   def post_author
@@ -35,10 +40,10 @@ class OEmbedPresenter
   end
 
   def post_author_url
-   Rails.application.routes.url_helpers.person_url(@post.author)
+   Rails.application.routes.url_helpers.person_url(@post.author, :host => AppConfig[:pod_uri].host)
   end
 
   def iframe_html
-    post_iframe_url(@post.id)
+    post_iframe_url(@post.id, :height => @opts[:maxheight], :width => @opts[:maxwidth])
   end
 end

app/views/layouts/post.html.haml

@@ -44,6 +44,8 @@
     = set_asset_host
     = translation_missing_warnings
     = current_user_atom_tag
+    - if @post.present?
+      %link{:rel => 'alternate', :type => "application/json+oembed", :href => "#{oembed_url(:url => post_url(@post))}"}
 
     = yield(:head)
     = csrf_meta_tag

config/environments/test.rb

@@ -47,4 +47,6 @@ Diaspora::Application.configure do
   # This is necessary if your schema can't be completely dumped by the schema dumper,
   # like if you have constraints or database-specific column types
   # config.active_record.schema_format = :sql
+  
+  config.default_url_options = { :host => AppConfig[:pod_uri].host}
 end

config/routes.rb

@@ -5,6 +5,7 @@
 Diaspora::Application.routes.draw do
   mount RailsAdmin::Engine => '/admin_panel', :as => 'rails_admin'
 
+  get 'oembed' => 'posts#oembed', :as => 'oembed'
   # Posting and Reading
   resources :reshares
 

spec/presenters/o_embed_presenter_spec.rb

@@ -1,6 +1,35 @@
 require 'spec_helper'
 describe OEmbedPresenter do
-  it 'works' do
-    OEmbedPresenter.new(Factory(:status_message)).to_json.should_not be_nil
+  before do
+   @oembed = OEmbedPresenter.new(Factory(:status_message))
+  end
+
+  it 'is a hash' do
+    @oembed.as_json.should be_a Hash
+  end
+
+  context 'required options from oembed spec' do
+    it 'supports maxheight + maxwidth(required)' do
+      oembed = OEmbedPresenter.new(Factory(:status_message), :maxwidth => 200, :maxheight => 300).as_json
+      oembed[:width].should  == 200
+      oembed[:height].should == 300
+    end
+  end
+
+  describe '#iframe_html' do
+    it 'passes the height options to post_iframe_url' do
+      @oembed.should_receive(:post_iframe_url).with(instance_of(Fixnum), instance_of(Hash))
+      @oembed.iframe_html
+    end
+  end
+
+  describe '.id_from_url' do
+    it 'takes a long post url and gives you the id' do
+      OEmbedPresenter.id_from_url('http://localhost:400/posts/1').should == "1"
+    end
+
+    it 'takes a short post url and gives you the id' do
+      OEmbedPresenter.id_from_url('http://localhost:400/p/1').should == "1"
+    end
   end
 end