58 lines
1.4 KiB
Ruby
58 lines
1.4 KiB
Ruby
# frozen_string_literal: true
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require "base64"
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module ActionMailer
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# Implements a mailer preview interceptor that converts image tag src attributes
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# that use inline cid: style URLs to data: style URLs so that they are visible
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# when previewing an HTML email in a web browser.
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#
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# This interceptor is enabled by default. To disable it, delete it from the
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# <tt>ActionMailer::Base.preview_interceptors</tt> array:
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#
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# ActionMailer::Base.preview_interceptors.delete(ActionMailer::InlinePreviewInterceptor)
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#
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class InlinePreviewInterceptor
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PATTERN = /src=(?:"cid:[^"]+"|'cid:[^']+')/i
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include Base64
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def self.previewing_email(message) #:nodoc:
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new(message).transform!
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end
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def initialize(message) #:nodoc:
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@message = message
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end
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def transform! #:nodoc:
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return message if html_part.blank?
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html_part.body = html_part.decoded.gsub(PATTERN) do |match|
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if part = find_part(match[9..-2])
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%[src="#{data_url(part)}"]
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else
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match
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end
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end
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message
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end
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private
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attr_reader :message
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def html_part
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@html_part ||= message.html_part
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end
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def data_url(part)
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"data:#{part.mime_type};base64,#{strict_encode64(part.body.raw_source)}"
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end
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def find_part(cid)
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message.all_parts.find { |p| p.attachment? && p.cid == cid }
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end
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end
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end
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