Class: ActiveCanvas::MediaRefBackfill

Inherits:
Object
  • Object
show all
Defined in:
app/services/active_canvas/media_ref_backfill.rb

Overview

One-time, best-effort backfill: rewrites legacy <img> tags whose src is an Active Storage blob redirect URL into stable <img data-ac-media-id=“N”> refs that ContentRenderer can resolve at render time. Idempotent; logs unmatched.

Recovers the blob id by decoding the signed_id payload directly, bypassing the expiry check (this is our own data) so already-rotted URLs are healed.

Constant Summary collapse

BLOB_URL_RE = 
%r{active_storage/blobs/(?:redirect|proxy)/([^/]+)/[^/]+\z}

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(logger) ⇒ MediaRefBackfill

Returns a new instance of MediaRefBackfill.



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# File 'app/services/active_canvas/media_ref_backfill.rb', line 18

def initialize(logger)
  @logger = logger
end

Class Method Details

.run(logger: Rails.logger) ⇒ Object 



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# File 'app/services/active_canvas/media_ref_backfill.rb', line 14

def self.run(logger: Rails.logger)
  new(logger).run
end

Instance Method Details

#run ⇒ Object 



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# File 'app/services/active_canvas/media_ref_backfill.rb', line 22

def run
  ActiveCanvas::Page.find_each do |page|
    content = page.content
    next if content.blank?

    fragment = Nokogiri::HTML5.fragment(content)
    changed = false

    fragment.css("img").each do |img|
      next if img["data-ac-media-id"].present?

      src = img["src"].to_s
      next unless src.match?(BLOB_URL_RE)

      media_id = media_id_for(src)
      if media_id
        img["data-ac-media-id"] = media_id.to_s
        changed = true
      else
        @logger.warn("[ActiveCanvas] backfill: could not match media for #{src} on page #{page.id}")
      end
    end

    # update_columns: skip sanitize + version callbacks; we only add a data-* attr.
    page.update_columns(content: fragment.to_html) if changed
  end
end