Adds body and headers matching for VCR

spec/spec_helper.rb

@@ -3,10 +3,13 @@
 require "ruby/openai"
 require "vcr"
 
+Dir[File.expand_path("spec/support/**/*.rb")].sort.each { |f| require f }
+
 VCR.configure do |c|
   c.hook_into :webmock
   c.cassette_library_dir = "spec/fixtures/cassettes"
-  c.default_cassette_options = { record: ENV["NO_VCR"] == "true" ? :all : :new_episodes }
+  c.default_cassette_options = { record: ENV["NO_VCR"] == "true" ? :all : :new_episodes,
+                                 match_requests_on: [:method, :uri, VCRMultipartMatcher.new] }
   c.filter_sensitive_data("<OPENAI_ACCESS_TOKEN>") { Ruby::OpenAI.configuration.access_token }
   c.filter_sensitive_data("<OPENAI_ORGANIZATION_ID>") { Ruby::OpenAI.configuration.organization_id }
 end

spec/support/vcr_multipart_matcher.rb

@@ -0,0 +1,47 @@
+class VCRMultipartMatcher
+  MULTIPART_HEADER_MATCHER = %r{^multipart/form-data; boundary=(.+)$}.freeze
+  BOUNDARY_SUBSTITUTION = "----MultipartBoundaryAbcD3fGhiXyz00001".freeze
+
+  def call(request1, request2)
+    return false unless same_content_type?(request1, request2)
+    unless headers_excluding_content_type(request1) == headers_excluding_content_type(request2)
+      return false
+    end
+
+    normalized_multipart_body(request1) == normalized_multipart_body(request2)
+  end
+
+  private
+
+  def same_content_type?(request1, request2)
+    content_type1 = (request1.headers["Content-Type"] || []).first.to_s
+    content_type2 = (request2.headers["Content-Type"] || []).first.to_s
+
+    if multipart_request?(content_type1)
+      multipart_request?(content_type2)
+    elsif multipart_request?(content_type2)
+      false
+    else
+      content_type1 == content_type2
+    end
+  end
+
+  def headers_excluding_content_type(request)
+    request.headers.except("Content-Type")
+  end
+
+  def normalized_multipart_body(request)
+    content_type = (request.headers["Content-Type"] || []).first.to_s
+
+    return request.headers unless multipart_request?(content_type)
+
+    boundary = MULTIPART_HEADER_MATCHER.match(content_type)[1]
+    request.body.gsub(boundary, BOUNDARY_SUBSTITUTION)
+  end
+
+  def multipart_request?(content_type)
+    return false if content_type.empty?
+
+    MULTIPART_HEADER_MATCHER.match?(content_type)
+  end
+end