Module: C2paXmpProbe

Defined in:
lib/c2pa_xmp_probe.rb

Defined Under Namespace

Classes: Result

Constant Summary collapse

VERSION = 
"0.1.0"
C2PA_MARKERS = 
%w[c2pa C2PA jumb c2ma c2cl c2cs c2as].freeze
XMP_MARKERS = 
[
  "http://ns.adobe.com/xap/1.0/",
  "<x:xmpmeta",
  "xmlns:xmp",
  "photoshop:DocumentAncestors"
].freeze
AI_HINT_MARKERS = 
[
  "Firefly",
  "Midjourney",
  "Stable Diffusion",
  "DALL-E",
  "DALL·E",
  "Content Credentials",
  "madewithai",
  "Made with AI"
].freeze

Class Method Summary collapse

Class Method Details

.probe_bytes(data, path: "<memory>") ⇒ Object 



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# File 'lib/c2pa_xmp_probe.rb', line 37

def probe_bytes(data, path: "<memory>")
  matched = []
  has_c2pa = false
  has_xmp = false
  has_ai_hint = false

  C2PA_MARKERS.each do |marker|
    next unless data.include?(marker)

    has_c2pa = true
    matched << marker
  end

  XMP_MARKERS.each do |marker|
    next unless data.include?(marker)

    has_xmp = true
    matched << marker[0, 48]
  end

  AI_HINT_MARKERS.each do |marker|
    next unless data.include?(marker)

    has_ai_hint = true
    matched << marker
  end

  Result.new(
    path: path,
    size: data.bytesize,
    has_c2pa: has_c2pa,
    has_xmp: has_xmp,
    has_ai_hint: has_ai_hint,
    matched: matched.uniq
  )
end

.probe_file(file_path) ⇒ Object 



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# File 'lib/c2pa_xmp_probe.rb', line 74

def probe_file(file_path)
  data = File.binread(file_path)
  probe_bytes(data, path: file_path)
end