discourse/lib/email_cook.rb

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# frozen_string_literal: true
require_dependency 'pretty_text'
# A very simple formatter for imported emails
class EmailCook
def self.url_regexp
@url_regexp ||= /((?:https?:(?:\/{1,3}|[a-z0-9%])|www\d{0,3}[.])(?:[^\s()<>]+|\([^\s()<>]+\))+(?:\([^\s()<>]+\)|[^`!()\[\]{};:'".,<>?«»“”‘’\s]))/
end
def self.raw_regexp
@raw_regexp ||= /^\[plaintext\]$\n(.*)\n^\[\/plaintext\]$(?:\s^\[attachments\]$\n(.*)\n^\[\/attachments\]$)?(?:\s^\[elided\]$\n(.*)\n^\[\/elided\]$)?/m
end
def initialize(raw)
@raw = raw
@body, @attachment_html, @elided = @raw.scan(EmailCook.raw_regexp).first
end
def add_quote(result, buffer)
if buffer.present?
return if buffer =~ /\A(<br>)+\z$/
result << "<blockquote>#{buffer}</blockquote>"
end
end
def link_string!(line, unescaped_line)
unescaped_line = unescaped_line.strip
unescaped_line.scan(EmailCook.url_regexp).each do |m|
url = m[0]
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if unescaped_line == url
# this could be oneboxed
val = %|<a href="#{url}" class="onebox" target="_blank">#{url}</a>|
else
val = %|<a href="#{url}">#{url}</a>|
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end
line.gsub!(url, val)
end
end
def htmlify(text)
result = +""
quote_buffer = +""
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in_text = false
in_quote = false
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text.each_line do |line|
# replace indentation with non-breaking spaces
line.sub!(/^\s{2,}/) { |s| "\u00A0" * s.length }
if line =~ /^\s*>/
in_quote = true
line.sub!(/^[\s>]*/, '')
unescaped_line = line
line = CGI.escapeHTML(line)
link_string!(line, unescaped_line)
quote_buffer << line << "<br>"
elsif in_quote
add_quote(result, quote_buffer)
quote_buffer = ""
in_quote = false
else
sz = line.size
unescaped_line = line
line = CGI.escapeHTML(line)
link_string!(line, unescaped_line)
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if sz < 60
if in_text && line == "\n"
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result << "<br>"
end
result << line
result << "<br>"
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in_text = false
else
result << line
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in_text = true
end
end
end
if in_quote && quote_buffer.present?
add_quote(result, quote_buffer)
end
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result.gsub!(/(<br>\n*){3,10}/, '<br><br>')
result
end
def cook(opts = {})
# fallback to PrettyText if we failed to detect a body
return PrettyText.cook(@raw, opts) if @body.nil?
result = htmlify(@body)
result << "\n<br>" << @attachment_html if @attachment_html.present?
result << "\n<br><br>" << Email::Receiver.elided_html(htmlify(@elided)) if @elided.present?
result
end
end