Class: Rhales::View

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Includes:
Utils::LoggingHelpers
Defined in:
lib/rhales/core/view.rb

Overview

  • Runtime data (CSRF tokens, nonces, request metadata)
  • Computed data (authentication status, theme classes)
  • User objects, configuration, internal APIs

Client Data: Explicit Allowlist

Only client data declared in sections reaches the browser: - Creates a REST API-like boundary - Server-side variable interpolation processes secrets safely - JSON serialization validates data structure - No accidental exposure of sensitive server data

Example: # Server template has full access: {user{user.admin?} {csrf_token} {internal_config}

# Client only gets declared data from schema:

const schema = z.object({ userName: z.string() });

See docs/CONTEXT_AND_DATA_BOUNDARIES.md for complete details.

Subclasses can override context_class to use different context implementations.

Defined Under Namespace

Classes: RenderError, TemplateNotFoundError

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Utils::LoggingHelpers

#format_value, #log_timed_operation, #log_with_metadata

Methods included from Utils

#now, #now_in_μs, #pretty_path

Constructor Details

#initialize(req, client: {}, server: {}, config: nil) ⇒ View

Returns a new instance of View.



72
73
74
75
 
# File 'lib/rhales/core/view.rb', line 72

def initialize(req, client: {}, server: {}, config: nil)
  @req = req
  @rsfc_context = context_class.for_view(req, client: client, server: server, config: config || Rhales.configuration)
end

Instance Attribute Details

#req ⇒ Object (readonly)

Returns the value of attribute req.



67
68
69
 
# File 'lib/rhales/core/view.rb', line 67

def req
  @req
end

#rsfc_context ⇒ Object (readonly)

Returns the value of attribute rsfc_context.



67
68
69
 
# File 'lib/rhales/core/view.rb', line 67

def rsfc_context
  @rsfc_context
end

Class Method Details

.default_template_name ⇒ Object

Get default template name based on class name



508
509
510
511
512
513
514
515
 
# File 'lib/rhales/core/view.rb', line 508

def default_template_name
  # Convert ClassName to class_name
  name.split('::').last
    .gsub(/([A-Z])/, '_\1')
    .downcase
    .sub(/^_/, '')
    .sub(/_view$/, '')
end

.render_with_data(req, template_name: nil, config: nil, **client_data) ⇒ Object

Render template with client data



518
519
520
521
 
# File 'lib/rhales/core/view.rb', line 518

def render_with_data(req, template_name: nil, config: nil, **client_data)
  view = new(req, client: client_data, config: config)
  view.render(template_name)
end

.with_data(req, config: nil, **client_data) ⇒ Object

Create view instance with client data



524
525
526
 
# File 'lib/rhales/core/view.rb', line 524

def with_data(req, config: nil, **client_data)
  new(req, client: client_data, config: config)
end

Instance Method Details

#build_view_composition(template_name) ⇒ Object (private)

Build view composition for the given template



325
326
327
328
329
 
# File 'lib/rhales/core/view.rb', line 325

def build_view_composition(template_name)
  loader      = method(:load_template_for_composition)
  composition = ViewComposition.new(template_name, loader: loader, config: config)
  composition.resolve!
end

#calculate_etag(template_name = nil, additional_context = {}) ⇒ Object

Calculate ETag for current template data



177
178
179
180
181
182
183
 
# File 'lib/rhales/core/view.rb', line 177

def calculate_etag(template_name = nil, additional_context = {})
  require_relative '../hydration/hydration_endpoint'

  template_name ||= self.class.default_template_name
  endpoint = HydrationEndpoint.new(config, @rsfc_context)
  endpoint.calculate_etag(template_name, additional_context)
end

#context_class ⇒ Object (protected)

Return the context class to use Subclasses can override this to use different context implementations



212
213
214
 
# File 'lib/rhales/core/view.rb', line 212

def context_class
  Context
end

#create_partial_resolver ⇒ Object (private)

Create partial resolver for partial} inclusions



282
283
284
285
286
287
288
289
290
291
292
293
294
 
# File 'lib/rhales/core/view.rb', line 282

def create_partial_resolver
  templates_dir = File.join(templates_root, 'web')

  proc do |partial_name|
    partial_path = File.join(templates_dir, "#{partial_name}.rue")

    if File.exist?(partial_path)
      # Return full partial content so TemplateEngine can process
      # data sections, otherwise nil.
      File.read(partial_path)
    end
  end
end

#create_partial_resolver_from_composition(composition) ⇒ Object (private)

Create partial resolver that uses pre-loaded templates from composition



374
375
376
377
378
379
 
# File 'lib/rhales/core/view.rb', line 374

def create_partial_resolver_from_composition(composition)
  proc do |partial_name|
    parser = composition.template(partial_name)
    parser ? parser.content : nil
  end
end

#data_changed?(template_name = nil, etag = nil, additional_context = {}) ⇒ Boolean

Check if template data has changed for caching

Returns:

  • (Boolean) 


168
169
170
171
172
173
174
 
# File 'lib/rhales/core/view.rb', line 168

def data_changed?(template_name = nil, etag = nil, additional_context = {})
  require_relative '../hydration/hydration_endpoint'

  template_name ||= self.class.default_template_name
  endpoint = HydrationEndpoint.new(config, @rsfc_context)
  endpoint.data_changed?(template_name, etag, additional_context)
end

#data_hash(template_name = nil) ⇒ Object

Get processed data as hash (for API endpoints or testing)



199
200
201
202
203
204
205
206
 
# File 'lib/rhales/core/view.rb', line 199

def data_hash(template_name = nil)
  template_name ||= self.class.default_template_name

  # Build composition and aggregate data
  composition = build_view_composition(template_name)
  aggregator  = HydrationDataAggregator.new(@rsfc_context)
  aggregator.aggregate(composition)
end

#detect_mount_point_in_rendered_html(template_html) ⇒ Object (private)

Detect mount points in fully rendered HTML



316
317
318
319
320
321
322
 
# File 'lib/rhales/core/view.rb', line 316

def detect_mount_point_in_rendered_html(template_html)
  return nil unless config&.hydration

  custom_selectors = config.hydration.mount_point_selectors || []
  detector = MountPointDetector.new
  detector.detect(template_html, custom_selectors)
end

#generate_hydration_from_merged_data(merged_data) ⇒ Object (private)

Generate hydration HTML from pre-merged data



382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
 
# File 'lib/rhales/core/view.rb', line 382

def generate_hydration_from_merged_data(merged_data)
  hydration_parts = []

  merged_data.each do |window_attr, data|
    # Generate unique ID for this data block
    unique_id = "rsfc-data-#{SecureRandom.hex(8)}"
    nonce_attr = nonce_attribute

    # Create JSON script tag with optional reflection attributes
    json_attrs = reflection_enabled? ? " data-window=\"#{window_attr}\"" : ''
    json_script = <<~HTML.strip
      <script#{nonce_attr} id="#{unique_id}" type="application/json"#{json_attrs}>#{JSONSerializer.dump(data)}</script>
    HTML

    # Create hydration script with optional reflection attributes
    hydration_attrs = reflection_enabled? ? " data-hydration-target=\"#{window_attr}\"" : ''
    hydration_script = if reflection_enabled?
      <<~HTML.strip
        <script#{nonce_attr}#{hydration_attrs}>
        var dataScript = document.getElementById('#{unique_id}');
        var targetName = dataScript.getAttribute('data-window') || '#{window_attr}';
        window[targetName] = JSON.parse(dataScript.textContent);
        </script>
      HTML
    else
      <<~HTML.strip
        <script#{nonce_attr}#{hydration_attrs}>
        window['#{window_attr}'] = JSON.parse(document.getElementById('#{unique_id}').textContent);
        </script>
      HTML
    end

    hydration_parts << json_script
    hydration_parts << hydration_script
  end

  # Add reflection utilities if enabled
  if reflection_enabled? && !merged_data.empty?
    hydration_parts << generate_reflection_utilities
  end

  return '' if hydration_parts.empty?

  hydration_content = hydration_parts.join("\n")
  "\n\n<!-- Rhales Hydration Start -->\n#{hydration_content}\n<!-- Rhales Hydration End -->"
end

#generate_reflection_utilities ⇒ Object (private)

Generate JavaScript utilities for hydration reflection



435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
 
# File 'lib/rhales/core/view.rb', line 435

def generate_reflection_utilities
  nonce_attr = nonce_attribute

  <<~HTML.strip
    <script#{nonce_attr}>
    // Rhales hydration reflection utilities
    window.__rhales__ = window.__rhales__ || {
      getHydrationTargets: function() {
        return Array.from(document.querySelectorAll('[data-hydration-target]'));
      },
      getDataForTarget: function(target) {
        var targetName = target.dataset.hydrationTarget;
        return targetName ? window[targetName] : undefined;
      },
      getWindowAttribute: function(scriptEl) {
        return scriptEl.dataset.window;
      },
      getDataScripts: function() {
        return Array.from(document.querySelectorAll('script[data-window]'));
      },
      refreshData: function(target) {
        var targetName = target.dataset.hydrationTarget;
        var dataScript = document.querySelector('script[data-window="' + targetName + '"]');
        if (dataScript && targetName) {
          try {
            window[targetName] = JSON.parse(dataScript.textContent);
            return true;
          } catch (e) {
            console.error('Rhales: Failed to refresh data for ' + targetName, e);
            return false;
          }
        }
        return false;
      },
      getAllHydrationData: function() {
        var data = {};
        this.getHydrationTargets().forEach(function(target) {
          var targetName = target.dataset.hydrationTarget;
          if (targetName) {
            data[targetName] = window[targetName];
          }
        });
        return data;
      }
    };
    </script>
  HTML
end

#inject_hydration_with_mount_points(composition, template_name, template_html, hydration_html) ⇒ Object (private)

Smart hydration injection with mount point detection on rendered HTML



297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
 
# File 'lib/rhales/core/view.rb', line 297

def inject_hydration_with_mount_points(composition, template_name, template_html, hydration_html)
  injector = HydrationInjector.new(config.hydration, template_name)

  # Check if using link-based strategy
  if config.hydration.link_based_strategy?
    # For link-based strategies, we need the merged data context
    aggregator = HydrationDataAggregator.new(@rsfc_context)
    merged_data = aggregator.aggregate(composition)
    nonce = @rsfc_context.get('nonce')

    injector.inject_link_based_strategy(template_html, merged_data, nonce)
  else
    # Traditional strategies (early, earliest, late)
    mount_point = detect_mount_point_in_rendered_html(template_html)
    injector.inject(template_html, hydration_html, mount_point)
  end
end

#load_template(template_name) ⇒ Object (private)

Load and parse template



219
220
221
222
223
224
225
226
227
228
 
# File 'lib/rhales/core/view.rb', line 219

def load_template(template_name)
  template_path = resolve_template_path(template_name)

  unless File.exist?(template_path)
    raise TemplateNotFoundError, "Template not found: #{template_path}"
  end

  # Use refinement to load .rue file
  require template_path
end

#load_template_for_composition(template_name) ⇒ Object (private)

Loader proc for ViewComposition



332
333
334
335
336
337
338
339
 
# File 'lib/rhales/core/view.rb', line 332

def load_template_for_composition(template_name)
  template_path = resolve_template_path(template_name)
  return nil unless File.exist?(template_path)

  require template_path
rescue StandardError => ex
  raise TemplateNotFoundError, "Failed to load template #{template_name}: #{ex.message}"
end

#nonce_attribute ⇒ Object (private)

Get nonce attribute if available



485
486
487
488
 
# File 'lib/rhales/core/view.rb', line 485

def nonce_attribute
  nonce = @rsfc_context.get('nonce')
  nonce ? " nonce=\"#{ERB::Util.html_escape(nonce)}\"" : ''
end

#reflection_enabled? ⇒ Boolean (private)

Check if reflection system is enabled

Returns:

  • (Boolean) 


430
431
432
 
# File 'lib/rhales/core/view.rb', line 430

def reflection_enabled?
  config.hydration.reflection_enabled
end

#render(template_name = nil) ⇒ Object

Render RSFC template with hydration using two-pass architecture



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
116
117
118
119
120
121
122
123
124
125
126
127
128
129
 
# File 'lib/rhales/core/view.rb', line 78

def render(template_name = nil)
  start_time = now_in_μs
  template_name ||= self.class.default_template_name

  # Store template name in request env for middleware validation
  @req.env['rhales.template_name'] = template_name if @req && @req.respond_to?(:env)

  begin
    # Phase 1: Build view composition and aggregate data
    composition           = build_view_composition(template_name)
    aggregator            = HydrationDataAggregator.new(@rsfc_context)
    merged_hydration_data = aggregator.aggregate(composition)

    # Phase 2: Render HTML with pre-computed data
    # Render template content
    template_html = render_template_with_composition(composition, template_name)

    # Generate hydration HTML with merged data
    hydration_html = generate_hydration_from_merged_data(merged_hydration_data)

    # Set CSP header if enabled
    set_csp_header_if_enabled

    # Smart hydration injection with mount point detection
    result = inject_hydration_with_mount_points(composition, template_name, template_html, hydration_html)

    # Log successful render
    duration = now_in_μs - start_time
    hydration_size = merged_hydration_data.to_json.bytesize if merged_hydration_data

    log_with_metadata(Rhales.logger, :debug, 'View rendered',
      template: template_name,
      layout: composition.layout,
      partials: composition.dependencies.values.flatten.uniq,
      duration: duration,
      hydration_size_bytes: hydration_size
    )

    result
  rescue StandardError => ex
    duration = now_in_μs - start_time

    log_with_metadata(Rhales.logger, :error, 'View render failed',
      template: template_name,
      duration: duration,
      error: ex.message,
      error_class: ex.class.name
    )

    raise RenderError, "Failed to render template '#{template_name}': #{ex.message}"
  end
end

#render_hydration_only(template_name = nil) ⇒ Object

Generate only the data hydration HTML



186
187
188
189
190
191
192
193
194
195
196
 
# File 'lib/rhales/core/view.rb', line 186

def render_hydration_only(template_name = nil)
  template_name ||= self.class.default_template_name

  # Build composition and aggregate data
  composition           = build_view_composition(template_name)
  aggregator            = HydrationDataAggregator.new(@rsfc_context)
  merged_hydration_data = aggregator.aggregate(composition)

  # Generate hydration HTML
  generate_hydration_from_merged_data(merged_hydration_data)
end

#render_json_only(template_name = nil, additional_context = {}) ⇒ Object

Render JSON response for API endpoints (link-based strategies)



141
142
143
144
145
146
147
 
# File 'lib/rhales/core/view.rb', line 141

def render_json_only(template_name = nil, additional_context = {})
  require_relative '../hydration/hydration_endpoint'

  template_name ||= self.class.default_template_name
  endpoint = HydrationEndpoint.new(config, @rsfc_context)
  endpoint.render_json(template_name, additional_context)
end

#render_jsonp_only(template_name = nil, callback_name = 'callback', additional_context = {}) ⇒ Object

Render JSONP response with callback



159
160
161
162
163
164
165
 
# File 'lib/rhales/core/view.rb', line 159

def render_jsonp_only(template_name = nil, callback_name = 'callback', additional_context = {})
  require_relative '../hydration/hydration_endpoint'

  template_name ||= self.class.default_template_name
  endpoint = HydrationEndpoint.new(config, @rsfc_context)
  endpoint.render_jsonp(template_name, callback_name, additional_context)
end

#render_module_only(template_name = nil, additional_context = {}) ⇒ Object

Render ES module response for modulepreload strategy



150
151
152
153
154
155
156
 
# File 'lib/rhales/core/view.rb', line 150

def render_module_only(template_name = nil, additional_context = {})
  require_relative '../hydration/hydration_endpoint'

  template_name ||= self.class.default_template_name
  endpoint = HydrationEndpoint.new(config, @rsfc_context)
  endpoint.render_module(template_name, additional_context)
end

#render_template_only(template_name = nil) ⇒ Object

Render only the template section (without data hydration)



132
133
134
135
136
137
138
 
# File 'lib/rhales/core/view.rb', line 132

def render_template_only(template_name = nil)
  template_name ||= self.class.default_template_name

  # Build composition for consistent behavior
  composition = build_view_composition(template_name)
  render_template_with_composition(composition, template_name)
end

#render_template_section(parser) ⇒ Object (private)

Render template section with Rhales

RSFC Security Model: Templates have full server context access - Templates can access all business data, user objects, methods, etc. - This is like any server-side template (ERB, HAML, etc.) - Security boundary is at server-to-client handoff, not within server rendering - Only data declared in section reaches the client (after validation)



270
271
272
273
274
275
276
277
278
279
 
# File 'lib/rhales/core/view.rb', line 270

def render_template_section(parser)
  template_content = parser.section('template')
  return '' unless template_content

  # Create partial resolver
  partial_resolver = create_partial_resolver

  # Render with full server context
  TemplateEngine.render(template_content, @rsfc_context, partial_resolver: partial_resolver)
end

#render_template_with_composition(composition, root_template_name) ⇒ Object (private)

Render template using the view composition



342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
 
# File 'lib/rhales/core/view.rb', line 342

def render_template_with_composition(composition, root_template_name)
  root_parser      = composition.template(root_template_name)
  template_content = root_parser.section('template')
  return '' unless template_content

  # Create partial resolver that uses the composition
  partial_resolver = create_partial_resolver_from_composition(composition)

  # Use existing context for rendering
  context_with_rue_data = @rsfc_context

  # Check if template has a layout
  if root_parser.layout && composition.template(root_parser.layout)
    # Render content template first
    content_html = TemplateEngine.render(template_content, context_with_rue_data, partial_resolver: partial_resolver)

    # Then render layout with content
    layout_parser  = composition.template(root_parser.layout)
    layout_content = layout_parser.section('template')
    return '' unless layout_content

    # Use builder pattern to create new context with content for layout rendering
    layout_context = context_with_rue_data.merge_client('content' => content_html)

    TemplateEngine.render(layout_content, layout_context, partial_resolver: partial_resolver)
  else
    # Render with full server context (no layout)
    TemplateEngine.render(template_content, context_with_rue_data, partial_resolver: partial_resolver)
  end
end

#resolve_template_path(template_name) ⇒ Object (private)

Resolve template path



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
 
# File 'lib/rhales/core/view.rb', line 231

def resolve_template_path(template_name)
  # Check configured template paths first
  if config && config.template_paths && !config.template_paths.empty?
    config.template_paths.each do |path|
      template_path = File.join(path, "#{template_name}.rue")
      return template_path if File.exist?(template_path)
    end
  end

  # Fallback to default template structure
  # First try templates/web directory
  web_path = File.join(templates_root, 'web', "#{template_name}.rue")
  return web_path if File.exist?(web_path)

  # Then try templates directory
  templates_path = File.join(templates_root, "#{template_name}.rue")
  return templates_path if File.exist?(templates_path)

  # Return first configured path or web path for error message
  if config && config.template_paths && !config.template_paths.empty?
    File.join(config.template_paths.first, "#{template_name}.rue")
  else
    web_path
  end
end

#set_csp_header_if_enabled ⇒ Object (private)

Set CSP header if enabled



491
492
493
494
495
496
497
498
499
500
501
502
503
504
 
# File 'lib/rhales/core/view.rb', line 491

def set_csp_header_if_enabled
  return unless config.csp_enabled
  return unless @req && @req.respond_to?(:env)

  # Get nonce from context
  nonce = @rsfc_context.get('nonce')

  # Create CSP instance and build header
  csp = CSP.new(config, nonce: nonce)
  header_value = csp.build_header

  # Set header in request environment for framework to use
  @req.env['csp_header'] = header_value if header_value
end

#templates_root ⇒ Object (private)

Get templates root directory



258
259
260
261
 
# File 'lib/rhales/core/view.rb', line 258

def templates_root
  boot_root = File.expand_path('../../..', __dir__)
  File.join(boot_root, 'templates')
end