Class: BentoSearch::JournalTocsForJournal

Inherits:
Object
  • Object
show all
Extended by:
HTTPClient::IncludeClient
Includes:
ActionView::Helpers::SanitizeHelper, SearchEngine
Defined in:
app/search_engines/bento_search/journal_tocs_for_journal.rb

Overview

Powered by JournalTocs (www.journaltocs.hw.ac.uk/index.php?action=api) This is NOT actually a typical Bento Search engine, it does not let you search for keywords, there is actually no #search method.

Instead, you can pull up list of current articles for a journal with #fetch_by_issn(issn)

Theoretically, JournalTocs could support a very basic keyword search too, but it’s very limited, and I didn’t have a use case for it, so didn’t implement. If someone wants it though, a normal bento search engine with very basic functionality could be implemented.

Required config:

[:registered_email]   email address you've registered with JournalTocs
            http://www.journaltocs.ac.uk/index.php?action=register

Defined Under Namespace

Classes: FetchError

Constant Summary collapse

HttpTimeout = 
3

Constants included from SearchEngine

SearchEngine::DefaultPerPage

Class Method Summary collapse

Instance Method Summary collapse

Methods included from SearchEngine

#fill_in_search_metadata_for, #initialize, #normalized_search_arguments, #public_settable_search_args, #search

Methods included from SearchEngine::Capabilities

#max_per_page, #search_field_definitions, #search_keys, #semantic_search_keys, #semantic_search_map, #sort_definitions, #sort_keys

Class Method Details

.default_configuration ⇒ Object 



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# File 'app/search_engines/bento_search/journal_tocs_for_journal.rb', line 183

def self.default_configuration
  {
    :base_url => 'http://www.journaltocs.ac.uk/api'
  }
end

.required_configuration ⇒ Object 



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# File 'app/search_engines/bento_search/journal_tocs_for_journal.rb', line 189

def self.required_configuration
  ["registered_email"]
end

Instance Method Details

#fetch_by_issn(issn) ⇒ Object

returns an array of BentoSearch::ResultItem objects, representing items.



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# File 'app/search_engines/bento_search/journal_tocs_for_journal.rb', line 80

def fetch_by_issn(issn)
  xml = fetch_xml(issn)


  results = BentoSearch::Results.new.concat(
    xml.xpath("./rdf:RDF/rss:item", xml_ns).collect do |node|
      item = BentoSearch::ResultItem.new

      item.format = "Article"

      item.issn   = issn # one we searched with, we know that!

      item.title  = xml_text(node, "rss:title")
      item.link   = xml_text(node, "rss:link")

      item.publisher      = xml_text(node, "prism:publisher") || xml_text(node, "dc:publisher")
      item.source_title   = xml_text(node, "prism:PublicationName")
      item.volume         = xml_text(node, "prism:volume")
      item.issue          = xml_text(node, "prism:number")
      item.start_page     = xml_text(node, "prism:startingPage")
      item.end_page       = xml_text(node, "prism:endingPage")

      # Look for something that looks like a DOI in dc:identifier
      node.xpath("dc:identifier").each do |id_node|
        if id_node.text =~ /\ADOI (.*)\Z/
          item.doi = $1
          # doi's seem to often have garbage after a "; ", especially
          # from highwire. heuristically fix, sorry, a real DOI with "; "
          # will get corrupted.
          if (parts = item.doi.split("; ")).length > 1
            item.doi = parts.first
          end

          break
        end
      end

      # authors?
      node.xpath("dc:creator", xml_ns).each do |creator_node|
        name = creator_node.text
        name.strip!

        # author names in RSS seem to often have HTML entities,
        # un-encode them to literals.
        name = HTMLEntities.new.decode(name)


        item.authors << BentoSearch::Author.new(:display => name)
      end

      # Date is weird and various formatted, we do our best to
      # look for yyyy-mm-dd at the beginning of either prism:coverDate or
      # dc:date or prism:publicationDate
      date_node = xml_text(node, "prism:coverDate") || xml_text(node, "dc:date") || xml_text(node, "prism:publicationDate")
      if date_node && date_node =~ /\A(\d\d\d\d-\d\d-\d\d)/
        item.publication_date = Date.strptime( $1, "%Y-%m-%d")
      elsif date_node
        # Let's try a random parse, they give us all kinds of things I'm afraid
        item.publication_date = Date.parse(date_node) rescue ArgumentError
      end

      # abstract, we need to strip possible HTML tags (sometimes they're
      # there, sometimes not).
      item.abstract   = xml_text(node, "rss:description").try do |text|
        strip_tags(text)
      end

      item
    end
  )

  # Items seem to come back in arbitrary order, we want to sort
  # by date reverse if we can
  if results.all? {|i| i.publication_date.present? }
    results.sort_by! {|i| i.publication_date}.reverse!
  end

  fill_in_search_metadata_for(results)

  return results
end

#fetch_xml(issn) ⇒ Object

return a nokogiri document of journal Tocs results. Usually just for internal use, use #fetch_by_issn instead.

May raise JournalTocsFetcher::FetchError on error (bad baseURL, bad API key, error response from journaltocs)



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# File 'app/search_engines/bento_search/journal_tocs_for_journal.rb', line 46

def fetch_xml(issn)

  xml =
    begin
      url = request_url(issn)
      response = http_client.get(url)

      # In some cases, status 401 seems to be bad email
      unless response.ok?
        # trim some XML boilerplate and remove newlines
        # from response body, for better error message
        response_body = response.body.gsub(/[\n\t]/, '').sub(/\A<\?xml[^>]*\>/, '')

        raise FetchError.new("#{url}: returns #{response.status} response: #{response_body}")
      end

      Nokogiri::XML(response.body)
    rescue SocketError => e
      raise FetchError.new("#{url}: #{e.inspect}")
    end

  # There's no good way to tell we got an error from unregistered email
  # or other usage problem except sniffing the XML to try and notice
  # it's giving us a usage message.
  if ( xml.xpath("./rdf:RDF/rss:item", xml_ns).length == 1 &&
       xml.at_xpath("./rdf:RDF/rss:item/rss:link", xml_ns).try(:text) == "http://www.journaltocs.ac.uk/develop.php" )
    raise FetchError.new("Usage error on api call, missing registered email? #{request_url}")
  end

  return xml
end

#request_url(issn) ⇒ Object 



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# File 'app/search_engines/bento_search/journal_tocs_for_journal.rb', line 179

def request_url(issn)
  "#{configuration.base_url}/journals/#{issn}?output=articles&user=#{CGI.escape configuration.registered_email}"
end

#xml_ns ⇒ Object

xml namespaces used in JournalTocs response, for nokogiri xpaths



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# File 'app/search_engines/bento_search/journal_tocs_for_journal.rb', line 169

def xml_ns
  { "rdf" => "http://www.w3.org/1999/02/22-rdf-syntax-ns#",
    "rss" => "http://purl.org/rss/1.0/",
    "prism"=>"http://prismstandard.org/namespaces/1.2/basic/",
    "dc"=>"http://purl.org/dc/elements/1.1/",
    "mn"=>"http://usefulinc.com/rss/manifest/",
    "content"=>"http://purl.org/rss/1.0/modules/content/"
  }
end

#xml_text(node, xpath) ⇒ Object

just a convenience method



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# File 'app/search_engines/bento_search/journal_tocs_for_journal.rb', line 163

def xml_text(node, xpath)
  node.at_xpath(xpath, xml_ns).try(:text)
end