Class: BrainzLab::DevTools::Middleware::ErrorPage

Inherits:
Object
  • Object
show all
Defined in:
lib/brainzlab/devtools/middleware/error_page.rb

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ ErrorPage

Returns a new instance of ErrorPage.



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# File 'lib/brainzlab/devtools/middleware/error_page.rb', line 9

def initialize(app)
  @app = app
  @renderer = Renderers::ErrorPageRenderer.new
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/brainzlab/devtools/middleware/error_page.rb', line 14

def call(env)
  return @app.call(env) if env['REQUEST_METHOD'] == 'OPTIONS'
  return @app.call(env) unless should_handle?(env)

  begin
    status, headers, body = @app.call(env)

    # Check if this is an error response that we should intercept
    if status >= 400 && html_response?(headers) && !json_request?(env) && !api_path?(env)
      # Check if this looks like Rails' default error page
      body_content = collect_body(body)
      if body_content.include?('Action Controller: Exception caught') || body_content.include?('background: #C00')
        # Extract exception info from the page
        exception_info = extract_exception_from_html(body_content)
        if exception_info
          data = collect_debug_data_from_info(env, exception_info, status)
          return render_error_page_from_info(exception_info, data, status)
        end
      end
    end

    [status, headers, body]
  rescue Exception => e
    # For JSON/API requests, return a proper JSON error response
    if json_request?(env) || api_path?(env)
      capture_to_reflex(e)
      return json_error_response(e)
    end

    # Still capture to Reflex if available
    capture_to_reflex(e)

    # Collect debug data and render branded error page
    data = collect_debug_data(env, e)
    render_error_page(e, data)
  end
end

#collect_debug_data_from_info(env, info, status = 500) ⇒ Object 



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# File 'lib/brainzlab/devtools/middleware/error_page.rb', line 96

def collect_debug_data_from_info(env, info, status = 500)
  context = defined?(BrainzLab::Context) ? BrainzLab::Context.current : nil
  collector_data = Data::Collector.get_request_data

  backtrace = (info[:backtrace] || []).map do |line|
    parsed = parse_backtrace_line(line)
    parsed[:in_app] = in_app_frame?(parsed[:file])
    parsed
  end

  # Extract source from the first in-app frame
  source_extract = extract_source_from_backtrace(info[:backtrace] || [])

  {
    exception: nil,
    exception_class: info[:class_name],
    exception_message: info[:message],
    backtrace: backtrace,
    request: build_request_info(env, context),
    context: build_context_info(context),
    sql_queries: collector_data.dig(:database, :queries) || [],
    environment: collect_environment_info,
    source_extract: source_extract
  }
end

#decode_html_entities(str) ⇒ Object 



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# File 'lib/brainzlab/devtools/middleware/error_page.rb', line 85

def decode_html_entities(str)
  return str unless str

  str.gsub(''', "'")
     .gsub('"', '"')
     .gsub('&', '&')
     .gsub('&lt;', '<')
     .gsub('&gt;', '>')
     .gsub('&nbsp;', ' ')
end

#extract_exception_from_html(body) ⇒ Object 



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# File 'lib/brainzlab/devtools/middleware/error_page.rb', line 58

def extract_exception_from_html(body)
  # Try to extract exception class and message from Rails error page
  if (match = body.match(%r{<h1>([^<]+)</h1>}))
    error_title = match[1]
    # Extract the exception message from the page
    if (msg_match = body.match(%r{<pre[^>]*>([^<]+)</pre>}))
      error_message = msg_match[1]
    end

    # Try to extract backtrace from Rails 8 format
    # Format: <a class="trace-frames ...">path/to/file.rb:123:in 'method'</a>
    backtrace = []
    body.scan(%r{<a[^>]*class="trace-frames[^"]*"[^>]*>\s*([^<]+)\s*</a>}m) do |trace_match|
      line = trace_match[0].strip
      # Decode HTML entities
      line = line.gsub('&#39;', "'").gsub('&quot;', '"').gsub('&amp;', '&').gsub('&lt;', '<').gsub('&gt;', '>')
      backtrace << line unless line.empty?
    end

    {
      class_name: decode_html_entities(error_title.strip),
      message: decode_html_entities(error_message&.strip || error_title.strip),
      backtrace: backtrace
    }
  end
end

#html_response?(headers) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/brainzlab/devtools/middleware/error_page.rb', line 52

def html_response?(headers)
  # Handle both uppercase and lowercase header names
  content_type = headers['Content-Type'] || headers['content-type'] || ''
  content_type.to_s.downcase.include?('text/html')
end

#render_error_page_from_info(info, data, status = 500) ⇒ Object 



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# File 'lib/brainzlab/devtools/middleware/error_page.rb', line 122

def render_error_page_from_info(info, data, status = 500)
  # Create a simple exception-like object
  exception = StandardError.new(info[:message])
  exception.define_singleton_method(:class) do
    Class.new(StandardError) do
      define_singleton_method(:name) { info[:class_name] }
    end
  end

  data[:exception] = exception
  html = @renderer.render(exception, data)

  [
    status,
    {
      'Content-Type' => 'text/html; charset=utf-8',
      'Content-Length' => html.bytesize.to_s,
      'X-Content-Type-Options' => 'nosniff'
    },
    [html]
  ]
end