mirror of
https://github.com/Fishwaldo/huginn.git
synced 2025-03-18 12:51:43 +00:00
Improve encoding detection in WebsiteAgent
Previously, WebsiteAgent always assumed that a content with no charset specified in the Content-Type header would be encoded in UTF-8. This enhancement is to make use of the encoding detector implemented in Nokogiri for HTML/XML documents, instead of blindly falling back to UTF-8. When the document `type` is `html` or `xml`, WebsiteAgent tries to detect the encoding of a fetched document from the presence of a BOM, XML declaration, or HTML `meta` tag. This fixes #1742.
This commit is contained in:
Akinori MUSHA
parent
950975d7a8
commit
50b5833a3f
3 changed files with 301 additions and 98 deletions
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@ -46,6 +46,8 @@ module WebRequestConcern
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# Never try to transcode a binary content
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next
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end
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# Return body as binary if default_encoding is nil
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next if encoding.nil?
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end
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body.encode!(Encoding::UTF_8, encoding)
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end
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@ -89,6 +91,9 @@ module WebRequestConcern
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end
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end
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# The default encoding for a text content with no `charset`
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# specified in the Content-Type header. Override this and make it
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# return nil if you want to detect the encoding on your own.
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def default_encoding
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Encoding::UTF_8
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end
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@ -94,7 +94,12 @@ module Agents
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Set `uniqueness_look_back` to limit the number of events checked for uniqueness (typically for performance). This defaults to the larger of #{UNIQUENESS_LOOK_BACK} or #{UNIQUENESS_FACTOR}x the number of detected received results.
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Set `force_encoding` to an encoding name if the website is known to respond with a missing, invalid, or wrong charset in the Content-Type header. Note that a text content without a charset is taken as encoded in UTF-8 (not ISO-8859-1).
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Set `force_encoding` to an encoding name (such as `UTF-8` and `ISO-8859-1`) if the website is known to respond with a missing, invalid, or wrong charset in the Content-Type header. Below are the steps to detect the encoding of a fetched content:
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1. If `force_encoding` is given, use the value.
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2. If the Content-Type header contains a charset parameter, use the value.
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3. When `type` is `html` or `xml`, check for the presence of a BOM, XML declaration with attribute "encoding", and an HTML meta tag with charset information.
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4. Fall back to UTF-8 (not ISO-8859-1).
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Set `user_agent` to a custom User-Agent name if the website does not like the default value (`#{default_user_agent}`).
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@ -307,6 +312,16 @@ module Agents
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error "Error when fetching url: #{e.message}\n#{e.backtrace.join("\n")}"
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end
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def default_encoding
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case extraction_type
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when 'html', 'xml'
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# Let Nokogiri detect the encoding
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nil
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else
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super
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end
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end
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def handle_data(body, url, existing_payload)
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doc = parse(body)
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@ -318,110 +318,293 @@ describe Agents::WebsiteAgent do
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end
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describe 'encoding' do
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it 'should be forced with force_encoding option' do
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huginn = "\u{601d}\u{8003}"
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stub_request(:any, /no-encoding/).to_return(body: {
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value: huginn,
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}.to_json.encode(Encoding::EUC_JP).b, headers: {
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'Content-Type' => 'application/json',
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}, status: 200)
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site = {
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'name' => "Some JSON Response",
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'expected_update_period_in_days' => "2",
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'type' => "json",
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'url' => "http://no-encoding.example.com",
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'mode' => 'on_change',
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'extract' => {
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'value' => { 'path' => 'value' },
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},
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'force_encoding' => 'EUC-JP',
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}
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checker = Agents::WebsiteAgent.new(name: "No Encoding Site", options: site)
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checker.user = users(:bob)
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checker.save!
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expect { checker.check }.to change { Event.count }.by(1)
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event = Event.last
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expect(event.payload['value']).to eq(huginn)
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let :huginn do
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"\u{601d}\u{8003}"
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end
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it 'should be overridden with force_encoding option' do
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huginn = "\u{601d}\u{8003}"
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stub_request(:any, /wrong-encoding/).to_return(body: {
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value: huginn,
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}.to_json.encode(Encoding::EUC_JP).b, headers: {
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'Content-Type' => 'application/json; UTF-8',
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}, status: 200)
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site = {
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'name' => "Some JSON Response",
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'expected_update_period_in_days' => "2",
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'type' => "json",
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'url' => "http://wrong-encoding.example.com",
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'mode' => 'on_change',
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'extract' => {
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'value' => { 'path' => 'value' },
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},
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'force_encoding' => 'EUC-JP',
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}
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checker = Agents::WebsiteAgent.new(name: "Wrong Encoding Site", options: site)
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checker.user = users(:bob)
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checker.save!
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expect { checker.check }.to change { Event.count }.by(1)
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event = Event.last
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expect(event.payload['value']).to eq(huginn)
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let :odin do
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"\u{d3}\u{f0}inn"
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end
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it 'should be determined by charset in Content-Type' do
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huginn = "\u{601d}\u{8003}"
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stub_request(:any, /charset-euc-jp/).to_return(body: {
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value: huginn,
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}.to_json.encode(Encoding::EUC_JP), headers: {
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'Content-Type' => 'application/json; charset=EUC-JP',
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}, status: 200)
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site = {
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'name' => "Some JSON Response",
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'expected_update_period_in_days' => "2",
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'type' => "json",
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'url' => "http://charset-euc-jp.example.com",
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'mode' => 'on_change',
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'extract' => {
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'value' => { 'path' => 'value' },
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},
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}
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checker = Agents::WebsiteAgent.new(name: "Charset reader", options: site)
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checker.user = users(:bob)
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checker.save!
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expect { checker.check }.to change { Event.count }.by(1)
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event = Event.last
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expect(event.payload['value']).to eq(huginn)
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let :url do
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'http://encoding-test.example.com/'
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end
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it 'should default to UTF-8 when unknown charset is found' do
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huginn = "\u{601d}\u{8003}"
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stub_request(:any, /charset-unknown/).to_return(body: {
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value: huginn,
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}.to_json.b, headers: {
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'Content-Type' => 'application/json; charset=unicode',
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}, status: 200)
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site = {
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'name' => "Some JSON Response",
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'expected_update_period_in_days' => "2",
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'type' => "json",
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'url' => "http://charset-unknown.example.com",
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'mode' => 'on_change',
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'extract' => {
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'value' => { 'path' => 'value' },
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},
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}
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checker = Agents::WebsiteAgent.new(name: "Charset reader", options: site)
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checker.user = users(:bob)
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checker.save!
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let :content_type do
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raise 'define me'
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end
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expect { checker.check }.to change { Event.count }.by(1)
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event = Event.last
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expect(event.payload['value']).to eq(huginn)
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let :body do
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raise 'define me'
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end
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before do
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stub_request(:any, url).to_return(
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headers: {
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'Content-Type' => content_type,
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},
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body: body.b,
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status: 200)
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end
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let :options do
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{
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'name' => 'Some agent',
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'expected_update_period_in_days' => '2',
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'url' => url,
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'mode' => 'on_change',
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}
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end
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let :checker do
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Agents::WebsiteAgent.create!(name: 'Encoding Checker', options: options) { |agent|
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agent.user = users(:bob)
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}
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end
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context 'with no encoding information' do
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context 'for a JSON file' do
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let :content_type do
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'application/json'
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end
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let :body do
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{
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value: huginn,
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}.to_json
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end
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let :options do
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super().merge(
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'type' => 'json',
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'extract' => {
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'value' => { 'path' => 'value' }
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}
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)
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end
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it 'should be assumed to be UTF-8' do
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expect { checker.check }.to change { Event.count }.by(1)
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event = Event.last
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expect(event.payload['value']).to eq(huginn)
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end
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end
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context 'for an HTML file' do
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let :content_type do
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'text/html'
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end
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let :options do
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super().merge(
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'type' => 'html',
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'extract' => {
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'value' => { 'css' => 'title', 'value' => 'string(.)' }
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}
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)
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end
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context 'with a charset in the header' do
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let :content_type do
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super() + '; charset=iso-8859-1'
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end
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let :body do
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<<-HTML.encode(Encoding::ISO_8859_1)
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<!DOCTYPE html>
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<title>#{odin}</title>
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<p>Hello, world.
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HTML
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end
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it 'should be detected from it' do
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expect { checker.check }.to change { Event.count }.by(1)
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event = Event.last
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expect(event.payload['value']).to eq(odin)
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end
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end
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context 'with no charset in the header' do
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let :body do
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<<-HTML.encode(Encoding::ISO_8859_1)
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<!DOCTYPE html>
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<meta charset="iso-8859-1">
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<title>#{odin}</title>
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<p>Hello, world.
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HTML
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end
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it 'should be detected from a meta tag' do
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expect { checker.check }.to change { Event.count }.by(1)
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event = Event.last
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expect(event.payload['value']).to eq(odin)
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end
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end
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context 'with charset desclarations both in the header and in the content' do
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let :content_type do
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super() + '; charset=iso-8859-1'
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end
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let :body do
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<<-HTML.encode(Encoding::ISO_8859_1)
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<!DOCTYPE html>
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<meta charset="UTF-8">
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<title>#{odin}</title>
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<p>Hello, world.
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HTML
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end
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it 'should be detected as that of the header' do
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expect { checker.check }.to change { Event.count }.by(1)
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event = Event.last
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expect(event.payload['value']).to eq(odin)
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end
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end
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end
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context 'for an XML file' do
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let :content_type do
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'application/xml'
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end
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let :options do
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super().merge(
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'type' => 'xml',
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'extract' => {
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'value' => { 'xpath' => '/root/message', 'value' => 'string(.)' }
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}
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)
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end
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context 'with a charset in the header' do
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let :content_type do
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super() + '; charset=euc-jp'
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end
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let :body do
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<<-XML.encode(Encoding::EUC_JP)
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<?xml version="1.0"?>
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<root>
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<message>#{huginn}</message>
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</root>
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XML
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end
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it 'should be detected from it' do
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expect { checker.check }.to change { Event.count }.by(1)
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event = Event.last
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expect(event.payload['value']).to eq(huginn)
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end
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end
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context 'with no charset in the header' do
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context 'but in XML declaration' do
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let :body do
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<<-XML.encode(Encoding::EUC_JP)
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<?xml version="1.0" encoding="euc-jp"?>
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<root>
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<message>#{huginn}</message>
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</root>
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XML
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end
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it 'should be detected' do
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expect { checker.check }.to change { Event.count }.by(1)
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event = Event.last
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expect(event.payload['value']).to eq(huginn)
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end
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end
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context 'but having a BOM' do
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let :body do
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<<-XML.encode(Encoding::UTF_16LE)
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\u{feff}<?xml version="1.0"?>
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<root>
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<message>#{huginn}</message>
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</root>
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XML
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end
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it 'should be detected' do
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expect { checker.check }.to change { Event.count }.by(1)
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event = Event.last
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expect(event.payload['value']).to eq(huginn)
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end
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end
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end
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end
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end
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context 'when force_encoding option is specified' do
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let :options do
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super().merge(
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'force_encoding' => 'EUC-JP'
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)
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end
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context 'for a JSON file' do
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let :content_type do
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'application/json'
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end
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let :body do
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{
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value: huginn,
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}.to_json.encode(Encoding::EUC_JP)
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end
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let :options do
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super().merge(
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'type' => 'json',
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'extract' => {
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'value' => { 'path' => 'value' }
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}
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)
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end
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it 'should be forced' do
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expect { checker.check }.to change { Event.count }.by(1)
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event = Event.last
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expect(event.payload['value']).to eq(huginn)
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end
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end
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context 'for an HTML file' do
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let :content_type do
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'text/html'
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end
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context 'with charset specified in the header and the content' do
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let :content_type do
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super() + '; charset=UTF-8'
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end
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let :body do
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<<-HTML.encode(Encoding::EUC_JP)
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<!DOCTYPE html>
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<meta charset="UTF-8"/>
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<title>#{huginn}</title>
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<p>Hello, world.
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HTML
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end
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let :options do
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super().merge(
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'type' => 'html',
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'extract' => {
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'value' => { 'css' => 'title', 'value' => 'string(.)' }
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}
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)
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end
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it 'should still be forced' do
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expect { checker.check }.to change { Event.count }.by(1)
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event = Event.last
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expect(event.payload['value']).to eq(huginn)
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end
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end
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end
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end
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end
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