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Refactoring: Clean up SignatureDetection class

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Ryan Lue 2019-03-20 20:22:20 +08:00 committed by Thorsten Eckel
parent eb97516bfc
commit 00934ef4f4
1 changed files with 29 additions and 91 deletions
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128
lib/signature_detection.rb
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@ -20,91 +20,34 @@ returns
=end
def self.find_signature(messages)
signature_candidates = Hash.new(0) # <potential_signature>: <score>
messages = messages.map { |m| m[:content_type].match?(%r{text/html}i) ? m[:content].html2text(true) : m[:content] }
message_pairs = messages.each_cons(2).to_a
diffs = message_pairs.map { |msg_pair| Diffy::Diff.new(*msg_pair).to_s }
string_list = messages.map { |m| m[:content] }
.map do |c|
c.match?(%r{text/html}i) ? c.html2text(true) : c
# Find the first 5- to 10-line common substring in each diff
diffs.map { |d| d.split("\n") }.each do |diff_lines|
# Get line numbers in diff representing changes (those starting with +, -, \)
delta_indices = diff_lines.map.with_index { |l, i| l.start_with?(' ') ? nil : i }.compact
# Add boundaries at start and end
delta_indices.unshift(-1).push(diff_lines.length)
# Find first gap of 5+ lines between deltas (i.e., the common substring's location)
sig_range = delta_indices.each_cons(2)
.map { |head, tail| [head + 1, tail - 1] }
.find { |head, tail| tail > head + 4 }
# Take up to 10 lines from this "gap" (i.e., the common substring)
match_content = diff_lines[sig_range.first..sig_range.last]
.map { |l| l.sub(/^./, '') }
.first(10).join("\n")
# Add this substring to the signature_candidates hash and increment its match score
signature_candidates[match_content] += 1
end
# hash with possible signature and count of matches in string list
possible_signatures = {}
# loop all strings in array
string_list.each_with_index do |_main_string, main_string_index|
break if main_string_index + 1 > string_list.length - 1
# loop all all strings in array except of the previous index
( main_string_index + 1..string_list.length - 1 ).each do |second_string_index|
# get content of string 1
string1_content = string_list[main_string_index]
# get content of string 2
string2_content = string_list[second_string_index]
# diff strings
diff_result = Diffy::Diff.new(string1_content, string2_content)
# split diff result by new line
diff_result_array = diff_result.to_s.split("\n")
# define start index for blocks with no difference
match_block = nil
# loop of lines of the diff result
( 0..diff_result_array.length - 1 ).each do |diff_string_index|
# if no block with difference is defined then we try to find a string block without a difference
if !match_block
match_block = diff_string_index
end
# get line of diff result with current loop inde
line = diff_result_array[diff_string_index]
# check if the line starts with
# + = new content incoming
# - = removed content
# \ = end of file
# or if the current line is the last line of the diff result
next if line !~ /^(\\|\+|\-)/i && diff_string_index != diff_result_array.length - 1
# if the count of the lines without any difference is higher than 4 lines
if diff_string_index - match_block > 4
# define the block size without any difference
# except "-" because in this case 1 line is removed to much
match_block_total = diff_string_index + (line.match?(/^(\\|\+)/i) ? -1 : 0)
# get string of possible signature, use only the first 10 lines
match_max_content = 0
match_content = ''
( match_block..match_block_total ).each do |match_block_index|
break if match_max_content == 10
match_max_content += 1
match_content += "#{diff_result_array[match_block_index][1..-1]}\n"
end
# count the match of the signature in string list to rank
# the signature
possible_signatures[match_content] ||= 0
possible_signatures[match_content] += 1
break
end
match_block = nil
end
end
end
# loop all possible signature by rating and return highest rating
possible_signatures.sort { |a1, a2| a2[1].to_i <=> a1[1].to_i }.map do |content, _score|
return content.chomp
end
nil
signature_candidates.max_by { |_, score| score }&.first
end
=begin
@ -124,18 +67,13 @@ returns
=end
def self.find_signature_line(signature, string, content_type)
if content_type.match?(%r{text/html}i)
string = string.html2text(true)
end
string = string.html2text(true) if content_type.match?(%r{text/html}i)
# try to find the char position of the signature
search_position = string.index(signature)
return if search_position.nil?
# count new lines up to signature
string[0..search_position].split("\n").length + 1
string[0..search_position].split("\n").length + 1 if search_position.present?
end
=begin
@ -256,11 +194,12 @@ returns
=end
def self.rebuild_all_articles
article_type = Ticket::Article::Type.lookup(name: 'email')
Ticket::Article.select('id').where(type_id: article_type.id).order(id: :desc).each do |local_article|
article = Ticket::Article.find(local_article.id)
user = User.find(article.created_by_id)
Ticket::Article.where(type_id: article_type.id)
.order(id: :desc)
.find_each(batch_size: 10) do |article|
user = User.lookup(id: article.created_by_id)
next if !user.preferences[:signature_detection]
signature_line = find_signature_line(
@ -269,10 +208,9 @@ returns
article.content_type,
)
next if !signature_line
next if article.preferences[:signature_detection] == signature_line
article.preferences[:signature_detection] = signature_line
article.save
article.save if article.changed?
end
true
end