From 787e9d26e094cbc2a8dab89d15926663ae659a3c Mon Sep 17 00:00:00 2001
From: Chris Jaekl <chris@jaekl.net>
Date: Wed, 26 Jun 2024 22:19:56 -0400
Subject: [PATCH] Refactor `Scanner::Opf` to reduce complexity

---
 app/scanner/epub.rb | 139 ++------------------------------------------
 app/tconn.rb        |   4 +-
 2 files changed, 8 insertions(+), 135 deletions(-)

diff --git a/app/scanner/epub.rb b/app/scanner/epub.rb
index bfc1e0d..119f854 100644
--- a/app/scanner/epub.rb
+++ b/app/scanner/epub.rb
@@ -3,6 +3,7 @@
 require "nokogiri"
 require "zip"
 
+require "scanner/opf"
 require "scanner/scanner"
 
 module Scanner
@@ -20,12 +21,8 @@ module Scanner
           puts "No META-INF/container.xml, skipping book #{filename.inspect}"
           return nil
         end
-        cont_xml = zipfile.read("META-INF/container.xml")
-        cont_doc = Nokogiri::XML(cont_xml)
-        opf_path = cont_doc.css("container rootfiles rootfile")[0]["full-path"]
-
         book = scan_base_attributes(filename)
-        scan_opf(book, zipfile, opf_path)
+        Opf.new(book).scan_opf(zipfile, opf_path(zipfile))
       end
     rescue Zip::Error => e
       puts "ERROR processing file #{filename.inspect}:"
@@ -35,134 +32,10 @@ module Scanner
 
     private
 
-    DC_NS_URL = "http://purl.org/dc/elements/1.1/"
-    private_constant :DC_NS_URL
-
-    def scan_opf(book, zipfile, opf_path)
-      cover_id = nil
-
-      opf_xml = zipfile.read(opf_path)
-      opf_doc = Nokogiri::XML(opf_xml)
-
-      #-------
-      # Author
-
-      grouping = book.author.grouping
-      reading_order = book.author.reading_order
-      sort_order = book.author.sort_order
-
-      creators = opf_doc.css("dc|creator", "dc" => DC_NS_URL)
-      unless creators.empty?
-        creator = creators[0]
-
-        return if creator.nil?
-
-        role = creator["opf:role"]
-        if role == "aut"
-          reading_order = creator.content
-
-          file_as = creator["opf:file-as"]
-          sort_order = file_as unless file_as.nil?
-        end
-
-        book.author = Author.new(grouping, reading_order, sort_order)
-      end
-
-      #---------------------------------------
-      # Title
-
-      titles = opf_doc.css("dc|title", "dc" => DC_NS_URL)
-      unless titles.empty?
-        title = titles[0]
-        book.title = title.content unless title.nil?
-      end
-
-      #---------------------------------------
-      # Description
-
-      descr_nodes = opf_doc.css("dc|description", "dc" => DC_NS_URL)
-      unless descr_nodes.empty?
-        descr_node = descr_nodes[0]
-        book.description = descr_node.content unless descr_node.nil?
-      end
-
-      #---------------------------------------
-      # Language
-
-      lang_nodes = opf_doc.css("dc|language", "dc" => DC_NS_URL)
-      unless lang_nodes.empty?
-        lang_node = lang_nodes[0]
-        book.language = lang_node.content if lang_node
-      end
-
-      #---------------------------------------
-      # Other metadata:  series, volume, cover
-
-      metas = opf_doc.css("package metadata meta")
-      metas.each do |m|
-        name = m["name"]
-        content = m["content"]
-
-        case name
-        when "calibre:series"
-          # TODO:  Dynamically create a new series?
-          # @series_id = content
-        when "calibre:series-index"
-          book.volume = content
-        when "cover"
-          cover_id = content
-        end
-      end
-
-      #---------------
-      # Load the cover
-
-      book.cover = load_cover(zipfile, opf_path, opf_doc, cover_id)
-
-      book
-    end
-
-    def load_cover(zipfile, opf_path, opf_doc, cover_id)
-      cover_id = "cover-image" if cover_id.nil?
-
-      items = opf_doc.css("package manifest item")
-      items.each do |i|
-        href = i["href"]
-        id = i["id"]
-        mime_type = i["media-type"]
-
-        next unless cover_id == id
-
-        entry = zipfile.find_entry(href)
-
-        if entry.nil?
-          # Although the epub standard requires the path to be relative
-          # to the base of the epub (zip), some books encountered in the
-          # wild have been found to use a bath relative to the location
-          # of the opf file.
-          parts = opf_path.split("/")
-          opf_base_path = parts[0..-2].join("/")
-          cover_path = "#{opf_base_path}/#{href}"
-          entry = zipfile.find_entry(cover_path)
-        end
-
-        if !entry && href.start_with?("../")
-          # Another case found in the wild:  cover image is at the root, but path is '../cover.jpeg'
-          cover_path = href[3..]
-          entry = zipfile.find_entry(cover_path)
-        end
-
-        if entry.nil?
-          puts "WARNING!  Cover image #{href.inspect} not found in file #{@book.path.inspect}."
-          return nil
-        else
-          entry.get_input_stream do |is|
-            return Cover.new(is, href, mime_type)
-          end
-        end
-      end
-
-      nil
+    def opf_path(zipfile)
+      cont_xml = zipfile.read("META-INF/container.xml")
+      cont_doc = Nokogiri::XML(cont_xml)
+      cont_doc.css("container rootfiles rootfile")[0]["full-path"]
     end
   end
 end
diff --git a/app/tconn.rb b/app/tconn.rb
index eb1faf0..437f301 100644
--- a/app/tconn.rb
+++ b/app/tconn.rb
@@ -24,7 +24,7 @@ class TimedConn
     end
   end
 
-  def exec(*args, &block)
+  def exec(*args)
     before = Time.now
     result = @conn.exec(*args)
     after = Time.now
@@ -37,7 +37,7 @@ class TimedConn
     yield(result)
   end
 
-  def exec_params(*args, &block)
+  def exec_params(*args)
     before = Time.now
     result = @conn.exec_params(*args)
     after = Time.now
-- 
2.39.2