Module: CloudAssets::Engine::ControllerMethods

Defined in:
lib/cloud_assets.rb

Instance Method Summary collapse

Instance Method Details

#apply_remote_layout ⇒ Object 



195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
 
# File 'lib/cloud_assets.rb', line 195

def apply_remote_layout
  begin
    if @remote_layout.nil?
      raise Exception.new(
        <<-ERR
          No remote layout is defined. Use set_remote_layout or
          set_default_remote_layout in your views prior to calling
          apply_remote_layout.
        ERR
      )
    end
    if @remote_layout.kind_of? String
      doc = optimized_html_for cloud_asset "#{@remote_layout}"
    else
      doc = optimized_html_for @remote_layout
    end
    unless @replacements.nil?
      @replacements.each do |key, value|
        value = value.encode("UTF-8")
        begin
          doc.css(key).each do |node|
            node.replace(value)
          end
        rescue
          Rails.logger.warn "Failed to replace template element: #{key}"
        end
      end
    end
    unless @overrides.nil?
      @overrides.each do |key, value|
        except = {}
        if value.kind_of? Hash
          # interpret as an option set
          except = value[:except]
          value = value[:value]
        end
        value = value.encode("UTF-8")
        begin
          doc.css(key).each do |node|
            except.each do |e|
               node.css(e).each do |sn|
                 value << sn.to_s
               end
            end
            node.inner_html = value
          end
        rescue StandardError => e
          Rails.logger.warn "Failed to override template element: #{key}"
          Rails.logger.warn e
        end
      end
    end
    unless @injections.nil?
      @injections.each do |key, value|
        value = value.encode("UTF-8")
        begin
          doc.css(key).each do |node|
            node.add_child(value)
          end
        rescue
          Rails.logger.warn "Failed to inject data into template element: #{key}"
        end
      end
    end
    s = doc.serialize(:encoding => 'UTF-8')
    # We don't know what in-doc references might be to, so we have to make
    # them local and can't optimize them to the CDN -- at least not without
    # some serious guessing which we are not ready to do
    CloudAssets::fixup_html(s.gsub CloudAssets::origin, '')
  rescue => e
    Rails.logger.error e
    raise e
  end
end

#cloud_asset(path) ⇒ Object 



71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
 
# File 'lib/cloud_assets.rb', line 71

def cloud_asset(path)
  if path =~ /^http.?:/
    raise ActionController::RoutingError.new("URL instead of URI for remote asset: #{path}")
  end
  p = CloudAssets::fixup_url("#{CloudAssets::origin}#{path}")
  hydra = Typhoeus::Hydra.hydra
  unless $dalli_cache.nil?
    hydra.cache_getter do |request|
      $dalli_cache.get(request.cache_key) rescue nil
    end
    hydra.cache_setter do |request|
      begin
        $dalli_cache.set(request.cache_key, request.response, request.cache_timeout)
      rescue
        Rails.logger.info "Attempt to save to memcached thru Dalli failed."
      end
    end
  end
  options = {
    :follow_location => true,
    :max_redirects => 3,
    :cache_timeout => CloudAssets::cache_timeout_seconds
  }
  unless CloudAssets::user.nil?
    options[:username] = CloudAssets::user
    options[:password] = CloudAssets::password
    options[:auth_method] = :basic
  end
  if CloudAssets.verbose
    Rails.logger.debug "Retrieving remote asset #{p}"
  end
  request = Typhoeus::Request.new p, options
  asset_response = nil
  request.on_complete do |hydra_response|
    asset_response = hydra_response
  end
  hydra.queue request
  hydra.run
  if asset_response.code == 404
    raise ActionController::RoutingError.new("Remote asset not found: #{path}")
  elsif asset_response.code > 399
    raise Exception.new("Error #{asset_response.code} on remote asset server fetching #{path}")
  end
  asset_response
end

#correct_uri(src) ⇒ Object 



125
126
127
 
# File 'lib/cloud_assets.rb', line 125

def correct_uri(src)
  src.gsub(CloudAssets::origin,'')
end

#inject_into_remote_layout(hash) ⇒ Object 



160
161
162
163
164
165
 
# File 'lib/cloud_assets.rb', line 160

def inject_into_remote_layout(hash)
  if @injections.nil?
    @injections = {}
  end
  @injections.merge! hash
end

#optimize_uri(src) ⇒ Object 



117
118
119
120
121
122
123
 
# File 'lib/cloud_assets.rb', line 117

def optimize_uri(src)
  return nil if src.nil?
  o = CloudAssets::cdn || ''
  src.gsub!(CloudAssets::origin,'')
  return src if src =~ /^http:/
  "#{o}#{src}"
end

#optimized_html_for(asset_response) ⇒ Object 



129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
 
# File 'lib/cloud_assets.rb', line 129

def optimized_html_for(asset_response)
  doc = Nokogiri::HTML(asset_response.body,nil,'UTF-8')

  { 'img' => 'src',
    'link' => 'href' }.each do |tag,attribute|
    doc.css(tag).each do |e|
      if tag == 'link' and e['rel'] != 'stylesheet'
        next
      end
      unless e[attribute].nil?
        e[attribute] = optimize_uri(e[attribute])
      end
    end
  end

  { 'a' => 'href',
    'script' => 'src',
    'link' => 'href' }.each do |tag,attribute|
    doc.css(tag).each do |e|
      if tag == 'link' and e['rel'] == 'stylesheet'
        next
      end
      unless e[attribute].nil?
        e[attribute] = correct_uri(e[attribute])
      end
    end
  end

  doc
end

#override_remote_layout(hash) ⇒ Object 



167
168
169
170
171
172
 
# File 'lib/cloud_assets.rb', line 167

def override_remote_layout(hash)
  if @overrides.nil?
    @overrides = {}
  end
  @overrides.merge! hash
end

#remove_remote_layout(selector) ⇒ Object 



181
182
183
 
# File 'lib/cloud_assets.rb', line 181

def remove_remote_layout(selector)
  replace_remote_layout(selector => '')
end

#replace_remote_layout(hash) ⇒ Object 



174
175
176
177
178
179
 
# File 'lib/cloud_assets.rb', line 174

def replace_remote_layout(hash)
  if @replacements.nil?
    @replacements = {}
  end
  @replacements.merge! hash
end

#set_default_remote_layout(layout) ⇒ Object 



189
190
191
192
193
 
# File 'lib/cloud_assets.rb', line 189

def set_default_remote_layout(layout)
  if @remote_layout.nil?
    @remote_layout = layout
  end
end

#set_remote_layout(layout) ⇒ Object 



185
186
187
 
# File 'lib/cloud_assets.rb', line 185

def set_remote_layout(layout)
  @remote_layout = layout
end