648 lines
22 KiB
Ruby
648 lines
22 KiB
Ruby
# frozen_string_literal: true
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require "final_destination"
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RSpec.describe FinalDestination do
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let(:opts) do
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{
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ignore_redirects: ["https://ignore-me.com"],
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force_get_hosts: %w[https://force.get.com https://*.ihaveawildcard.com/],
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preserve_fragment_url_hosts: ["https://eviltrout.com"],
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}
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end
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let(:doc_response) { { status: 200, headers: { "Content-Type" => "text/html" } } }
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let(:image_response) { { status: 200, headers: { "Content-Type" => "image/jpeg" } } }
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let(:body_response) { { status: 200, body: "<body>test</body>" } }
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def fd_stub_request(method, url)
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uri = URI.parse(url)
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host = uri.hostname
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ip = "1.2.3.4"
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# In Excon we pass the IP in the URL, so we need to stub
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# that version as well
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uri.hostname = "HOSTNAME_PLACEHOLDER"
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matcher =
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Regexp.escape(uri.to_s).sub(
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"HOSTNAME_PLACEHOLDER",
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"(#{Regexp.escape(host)}|#{Regexp.escape(ip)})",
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)
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stub_request(method, /\A#{matcher}\z/).with(headers: { "Host" => host })
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end
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def canonical_follow(from, dest)
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fd_stub_request(:get, from).to_return(
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status: 200,
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body: "<head><link rel=\"canonical\" href=\"#{dest}\"></head>",
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)
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end
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def redirect_response(from, dest)
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fd_stub_request(:head, from).to_return(status: 302, headers: { "Location" => dest })
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end
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def fd(url)
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FinalDestination.new(url, opts)
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end
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it "correctly parses ignored hostnames" do
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fd =
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FinalDestination.new(
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"https://meta.discourse.org",
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ignore_redirects: %w[http://google.com youtube.com https://meta.discourse.org ://bing.com],
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)
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expect(fd.ignored).to eq(%w[test.localhost google.com meta.discourse.org])
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end
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it "raises an error when URL is too long to encode" do
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expect {
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FinalDestination.new("https://meta.discourse.org/" + "x" * UrlHelper::MAX_URL_LENGTH)
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}.to raise_error(FinalDestination::UrlEncodingError)
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end
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describe ".resolve" do
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it "has a ready status code before anything happens" do
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expect(fd("https://eviltrout.com").status).to eq(:ready)
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end
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it "returns nil for an invalid url" do
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expect(fd(nil).resolve).to be_nil
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expect(fd("asdf").resolve).to be_nil
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end
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it "returns nil for unresolvable url" do
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FinalDestination::SSRFDetector.stubs(:lookup_ips).raises(SocketError)
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expect(fd("https://example.com").resolve).to eq(nil)
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end
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it "returns nil for url timeout" do
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FinalDestination::SSRFDetector.stubs(:lookup_ips).raises(Timeout::Error)
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expect(fd("https://example.com").resolve).to eq(nil)
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end
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it "returns nil when read timeouts" do
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Excon.expects(:public_send).raises(Excon::Errors::Timeout)
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expect(fd("https://discourse.org").resolve).to eq(nil)
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end
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context "without redirects" do
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before { fd_stub_request(:head, "https://eviltrout.com/").to_return(doc_response) }
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it "returns the final url" do
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final = FinalDestination.new("https://eviltrout.com", opts)
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expect(final.resolve.to_s).to eq("https://eviltrout.com")
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expect(final.redirected?).to eq(false)
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expect(final.status).to eq(:resolved)
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end
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end
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it "ignores redirects" do
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final = FinalDestination.new("https://ignore-me.com/some-url", opts)
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expect(final.resolve.to_s).to eq("https://ignore-me.com/some-url")
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expect(final.redirected?).to eq(false)
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expect(final.status).to eq(:resolved)
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end
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context "with underscores in URLs" do
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before { fd_stub_request(:head, "https://some_thing.example.com").to_return(doc_response) }
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it "doesn't raise errors with underscores in urls" do
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final = FinalDestination.new("https://some_thing.example.com", opts)
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expect(final.resolve.to_s).to eq("https://some_thing.example.com")
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expect(final.redirected?).to eq(false)
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expect(final.status).to eq(:resolved)
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end
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end
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context "with a couple of redirects" do
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before do
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redirect_response("https://eviltrout.com", "https://codinghorror.com/blog")
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redirect_response("https://codinghorror.com/blog", "https://discourse.org")
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fd_stub_request(:head, "https://discourse.org").to_return(doc_response)
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end
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it "returns the final url" do
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final = FinalDestination.new("https://eviltrout.com", opts)
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expect(final.resolve.to_s).to eq("https://discourse.org")
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expect(final.redirected?).to eq(true)
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expect(final.status).to eq(:resolved)
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end
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end
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context "with too many redirects" do
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before do
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redirect_response("https://eviltrout.com", "https://codinghorror.com/blog")
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redirect_response("https://codinghorror.com/blog", "https://discourse.org")
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fd_stub_request(:head, "https://discourse.org").to_return(doc_response)
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end
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it "returns the final url" do
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final = FinalDestination.new("https://eviltrout.com", opts.merge(max_redirects: 1))
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expect(final.resolve).to be_nil
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expect(final.redirected?).to eq(true)
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expect(final.status).to eq(:too_many_redirects)
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end
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end
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context "with a redirect to an internal IP" do
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before do
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redirect_response("https://eviltrout.com", "https://private-host.com")
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FinalDestination::SSRFDetector
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.stubs(:lookup_and_filter_ips)
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.with("eviltrout.com")
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.returns(["1.2.3.4"])
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FinalDestination::SSRFDetector
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.stubs(:lookup_and_filter_ips)
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.with("private-host.com")
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.raises(FinalDestination::SSRFDetector::DisallowedIpError)
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end
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it "returns the final url" do
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final = FinalDestination.new("https://eviltrout.com", opts)
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expect(final.resolve).to be_nil
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expect(final.redirected?).to eq(true)
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expect(final.status).to eq(:invalid_address)
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end
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end
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context "with a redirect to login path" do
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before { redirect_response("https://eviltrout.com/t/xyz/1", "https://eviltrout.com/login") }
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it "does not follow redirect" do
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final = FinalDestination.new("https://eviltrout.com/t/xyz/1", opts)
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expect(final.resolve.to_s).to eq("https://eviltrout.com/t/xyz/1")
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expect(final.redirected?).to eq(false)
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expect(final.status).to eq(:resolved)
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end
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end
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it "raises error when response is too big" do
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stub_const(described_class, "MAX_REQUEST_SIZE_BYTES", 1) do
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fd_stub_request(:get, "https://codinghorror.com/blog").to_return(body_response)
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final =
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FinalDestination.new("https://codinghorror.com/blog", opts.merge(follow_canonical: true))
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expect { final.resolve }.to raise_error(
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Excon::Errors::ExpectationFailed,
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"response size too big: https://codinghorror.com/blog",
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)
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end
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end
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it "raises error when response is too slow" do
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fd_stub_request(:get, "https://codinghorror.com/blog").to_return(
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lambda do |request|
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freeze_time(11.seconds.from_now)
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body_response
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end,
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)
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final =
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FinalDestination.new("https://codinghorror.com/blog", opts.merge(follow_canonical: true))
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expect { final.resolve }.to raise_error(
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Excon::Errors::ExpectationFailed,
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"connect timeout reached: https://codinghorror.com/blog",
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)
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end
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context "when following canonical links" do
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it "resolves the canonical link as the final destination" do
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canonical_follow("https://eviltrout.com", "https://codinghorror.com/blog")
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fd_stub_request(:head, "https://codinghorror.com/blog").to_return(doc_response)
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final = FinalDestination.new("https://eviltrout.com", opts.merge(follow_canonical: true))
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expect(final.resolve.to_s).to eq("https://codinghorror.com/blog")
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expect(final.redirected?).to eq(false)
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expect(final.status).to eq(:resolved)
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end
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it "resolves the canonical link when the URL is relative" do
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host = "https://codinghorror.com"
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canonical_follow("#{host}/blog", "/blog/canonical")
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fd_stub_request(:head, "#{host}/blog/canonical").to_return(doc_response)
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final = FinalDestination.new("#{host}/blog", opts.merge(follow_canonical: true))
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expect(final.resolve.to_s).to eq("#{host}/blog/canonical")
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expect(final.redirected?).to eq(false)
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expect(final.status).to eq(:resolved)
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end
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it "resolves the canonical link when the URL is relative and does not start with the / symbol" do
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host = "https://codinghorror.com"
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canonical_follow("#{host}/blog", "blog/canonical")
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fd_stub_request(:head, "#{host}/blog/canonical").to_return(doc_response)
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final = FinalDestination.new("#{host}/blog", opts.merge(follow_canonical: true))
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expect(final.resolve.to_s).to eq("#{host}/blog/canonical")
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expect(final.redirected?).to eq(false)
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expect(final.status).to eq(:resolved)
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end
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it "does not follow the canonical link if it's the same as the current URL" do
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canonical_follow("https://eviltrout.com", "https://eviltrout.com")
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final = FinalDestination.new("https://eviltrout.com", opts.merge(follow_canonical: true))
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expect(final.resolve.to_s).to eq("https://eviltrout.com")
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expect(final.redirected?).to eq(false)
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expect(final.status).to eq(:resolved)
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end
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it "does not follow the canonical link if it's invalid" do
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canonical_follow("https://eviltrout.com", "")
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final = FinalDestination.new("https://eviltrout.com", opts.merge(follow_canonical: true))
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expect(final.resolve.to_s).to eq("https://eviltrout.com")
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expect(final.redirected?).to eq(false)
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expect(final.status).to eq(:resolved)
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end
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end
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context "when forcing GET" do
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it "will do a GET when forced" do
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url = "https://force.get.com/posts?page=4"
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get_stub = fd_stub_request(:get, url)
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head_stub = fd_stub_request(:head, url)
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final = FinalDestination.new(url, opts)
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expect(final.resolve.to_s).to eq(url)
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expect(final.status).to eq(:resolved)
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expect(get_stub).to have_been_requested
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expect(head_stub).to_not have_been_requested
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end
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it "will do a HEAD if not forced" do
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url = "https://eviltrout.com/posts?page=2"
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get_stub = fd_stub_request(:get, url)
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head_stub = fd_stub_request(:head, url)
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final = FinalDestination.new(url, opts)
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expect(final.resolve.to_s).to eq(url)
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expect(final.status).to eq(:resolved)
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expect(get_stub).to_not have_been_requested
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expect(head_stub).to have_been_requested
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end
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it "will do a GET when forced on a wildcard subdomain" do
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url = "https://any-subdomain.ihaveawildcard.com/some/other/content"
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get_stub = fd_stub_request(:get, url)
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head_stub = fd_stub_request(:head, url)
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final = FinalDestination.new(url, opts)
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expect(final.resolve.to_s).to eq(url)
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expect(final.status).to eq(:resolved)
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expect(get_stub).to have_been_requested
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expect(head_stub).to_not have_been_requested
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end
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it "will do a HEAD if on a subdomain of a forced get domain without a wildcard" do
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url = "https://particularly.eviltrout.com/has/a/secret/plan"
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get_stub = fd_stub_request(:get, url)
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head_stub = fd_stub_request(:head, url)
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final = FinalDestination.new(url, opts)
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expect(final.resolve.to_s).to eq(url)
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expect(final.status).to eq(:resolved)
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expect(get_stub).to_not have_been_requested
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expect(head_stub).to have_been_requested
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end
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end
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context "when HEAD not supported" do
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before do
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fd_stub_request(:get, "https://eviltrout.com").to_return(
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status: 301,
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headers: {
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"Location" => "https://discourse.org",
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"Set-Cookie" => "evil=trout",
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},
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)
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fd_stub_request(:head, "https://discourse.org")
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end
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context "when the status code is 405" do
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before { fd_stub_request(:head, "https://eviltrout.com").to_return(status: 405) }
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it "will try a GET" do
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final = FinalDestination.new("https://eviltrout.com", opts)
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expect(final.resolve.to_s).to eq("https://discourse.org")
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expect(final.status).to eq(:resolved)
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expect(final.cookie).to eq("evil=trout")
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end
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end
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context "when the status code is 501" do
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before { fd_stub_request(:head, "https://eviltrout.com").to_return(status: 501) }
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it "will try a GET" do
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final = FinalDestination.new("https://eviltrout.com", opts)
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expect(final.resolve.to_s).to eq("https://discourse.org")
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expect(final.status).to eq(:resolved)
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expect(final.cookie).to eq("evil=trout")
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end
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end
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it "correctly extracts cookies during GET" do
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fd_stub_request(:head, "https://eviltrout.com").to_return(status: 405)
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fd_stub_request(:get, "https://eviltrout.com").to_return(
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status: 302,
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body: "",
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headers: {
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"Location" => "https://eviltrout.com",
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"Set-Cookie" => [
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"foo=219ffwef9w0f; expires=Mon, 19-Feb-2018 10:44:24 GMT; path=/; domain=eviltrout.com",
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"bar=1",
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"baz=2; expires=Tue, 19-Feb-2019 10:14:24 GMT; path=/; domain=eviltrout.com",
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],
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},
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)
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fd_stub_request(:head, "https://eviltrout.com").with(
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headers: {
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"Cookie" => "bar=1; baz=2; foo=219ffwef9w0f",
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},
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)
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final = FinalDestination.new("https://eviltrout.com", opts)
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expect(final.resolve.to_s).to eq("https://eviltrout.com")
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expect(final.status).to eq(:resolved)
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expect(final.cookie).to eq("bar=1; baz=2; foo=219ffwef9w0f")
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end
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end
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it "should use the correct format for cookies when there is only one cookie" do
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fd_stub_request(:head, "https://eviltrout.com").to_return(
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status: 302,
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headers: {
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"Location" => "https://eviltrout.com",
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"Set-Cookie" =>
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"foo=219ffwef9w0f; expires=Mon, 19-Feb-2018 10:44:24 GMT; path=/; domain=eviltrout.com",
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},
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)
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fd_stub_request(:head, "https://eviltrout.com").with(
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headers: {
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"Cookie" => "foo=219ffwef9w0f",
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},
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)
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final = FinalDestination.new("https://eviltrout.com", opts)
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expect(final.resolve.to_s).to eq("https://eviltrout.com")
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expect(final.status).to eq(:resolved)
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expect(final.cookie).to eq("foo=219ffwef9w0f")
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end
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it "should use the correct format for cookies when there are multiple cookies" do
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fd_stub_request(:head, "https://eviltrout.com").to_return(
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status: 302,
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headers: {
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"Location" => "https://eviltrout.com",
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"Set-Cookie" => [
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"foo=219ffwef9w0f; expires=Mon, 19-Feb-2018 10:44:24 GMT; path=/; domain=eviltrout.com",
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"bar=1",
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"baz=2; expires=Tue, 19-Feb-2019 10:14:24 GMT; path=/; domain=eviltrout.com",
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],
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},
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)
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fd_stub_request(:head, "https://eviltrout.com").with(
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headers: {
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"Cookie" => "bar=1; baz=2; foo=219ffwef9w0f",
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},
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)
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final = FinalDestination.new("https://eviltrout.com", opts)
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expect(final.resolve.to_s).to eq("https://eviltrout.com")
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expect(final.status).to eq(:resolved)
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expect(final.cookie).to eq("bar=1; baz=2; foo=219ffwef9w0f")
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end
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it "persists fragment url" do
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origin_url = "https://eviltrout.com/origin/lib/code/foobar.rb"
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upstream_url = "https://eviltrout.com/upstream/lib/code/foobar.rb"
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redirect_response(origin_url, upstream_url)
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fd_stub_request(:head, upstream_url).to_return(doc_response)
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final = FinalDestination.new("#{origin_url}#L154-L205", opts)
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expect(final.resolve.to_s).to eq("#{upstream_url}#L154-L205")
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expect(final.status).to eq(:resolved)
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end
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context "with content_type" do
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before do
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fd_stub_request(:head, "https://eviltrout.com/this/is/an/image").to_return(image_response)
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end
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it "returns a content_type" do
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final = FinalDestination.new("https://eviltrout.com/this/is/an/image", opts)
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expect(final.resolve.to_s).to eq("https://eviltrout.com/this/is/an/image")
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expect(final.content_type).to eq("image/jpeg")
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expect(final.status).to eq(:resolved)
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end
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end
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end
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describe "#get" do
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let(:fd) { FinalDestination.new("http://wikipedia.com", opts.merge(verbose: true)) }
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before { described_class.clear_https_cache!("wikipedia.com") }
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context "when there is a redirect" do
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after { WebMock.reset! }
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||
it "correctly streams" do
|
||
stub_request(:get, "http://wikipedia.com/").to_return(
|
||
status: 302,
|
||
body: "",
|
||
headers: {
|
||
"location" => "https://wikipedia.com/",
|
||
},
|
||
)
|
||
|
||
# webmock does not do chunks
|
||
stub_request(:get, "https://wikipedia.com/").to_return(
|
||
status: 200,
|
||
body: "<html><head>",
|
||
headers: {
|
||
},
|
||
)
|
||
|
||
chunk = nil
|
||
result =
|
||
fd.get do |resp, c|
|
||
chunk = c
|
||
throw :done
|
||
end
|
||
|
||
expect(result).to eq("https://wikipedia.com/")
|
||
expect(chunk).to eq("<html><head>")
|
||
end
|
||
|
||
it "does not forward 'Authorization' header to subsequent hosts" do
|
||
fd =
|
||
FinalDestination.new(
|
||
"http://wikipedia.com",
|
||
headers: {
|
||
"Authorization" => "Basic #{Base64.strict_encode64("account_id:license_key")}",
|
||
},
|
||
)
|
||
|
||
stub_request(:get, "http://wikipedia.com").with(
|
||
basic_auth: %w[account_id license_key],
|
||
).to_return(status: 302, body: "", headers: { "Location" => "http://some.host.com/" })
|
||
|
||
stub_request(:get, "http://some.host.com/")
|
||
.with { |req| expect(req.headers.key?("Authorization")).to eq(false) }
|
||
.to_return(status: 200, body: "")
|
||
|
||
fd.get {}
|
||
end
|
||
end
|
||
|
||
context "when there is a timeout" do
|
||
subject(:get) { fd.get {} }
|
||
|
||
before { fd.stubs(:safe_session).raises(Timeout::Error) }
|
||
|
||
it "logs the exception" do
|
||
Rails
|
||
.logger
|
||
.expects(:warn)
|
||
.with(regexp_matches(/FinalDestination could not resolve URL \(timeout\)/))
|
||
get
|
||
end
|
||
|
||
it "returns nothing" do
|
||
expect(get).to be_blank
|
||
end
|
||
end
|
||
|
||
context "when there is an SSL error" do
|
||
subject(:get) { fd.get {} }
|
||
|
||
before { fd.stubs(:safe_session).raises(OpenSSL::SSL::SSLError) }
|
||
|
||
it "logs the exception" do
|
||
Rails.logger.expects(:warn).with(regexp_matches(/an error with ssl occurred/i))
|
||
get
|
||
end
|
||
|
||
it "returns nothing" do
|
||
expect(get).to be_blank
|
||
end
|
||
end
|
||
end
|
||
|
||
describe ".validate_url_format" do
|
||
it "supports http urls" do
|
||
expect(fd("http://eviltrout.com").validate_uri_format).to eq(true)
|
||
end
|
||
|
||
it "supports https urls" do
|
||
expect(fd("https://eviltrout.com").validate_uri_format).to eq(true)
|
||
end
|
||
|
||
it "doesn't support ftp urls" do
|
||
expect(fd("ftp://eviltrout.com").validate_uri_format).to eq(false)
|
||
end
|
||
|
||
it "doesn't support IP urls" do
|
||
expect(fd("http://104.25.152.10").validate_uri_format).to eq(false)
|
||
expect(fd("https://[2001:abc:de:01:0:3f0:6a65:c2bf]").validate_uri_format).to eq(false)
|
||
end
|
||
|
||
it "returns false for schemeless URL" do
|
||
expect(fd("eviltrout.com").validate_uri_format).to eq(false)
|
||
end
|
||
|
||
it "returns false for nil URL" do
|
||
expect(fd(nil).validate_uri_format).to eq(false)
|
||
end
|
||
|
||
it "returns false for invalid https ports" do
|
||
expect(fd("https://eviltrout.com:8000").validate_uri_format).to eq(false)
|
||
end
|
||
|
||
it "returns true for valid http and https ports" do
|
||
expect(fd("http://eviltrout.com:80").validate_uri_format).to eq(true)
|
||
expect(fd("https://eviltrout.com:443").validate_uri_format).to eq(true)
|
||
end
|
||
|
||
it "returns false for invalid http port" do
|
||
expect(fd("http://eviltrout.com:21").validate_uri_format).to eq(false)
|
||
end
|
||
|
||
context "when s3_endpoint defined" do
|
||
before { SiteSetting.s3_endpoint = "http://minio.local:9000" }
|
||
|
||
it "returns false if the host is not in allowed_internal_hosts" do
|
||
expect(fd("http://discoursetest.minio.local:9000").validate_uri_format).to eq(false)
|
||
end
|
||
|
||
it "returns true if the host is in allowed_internal_hosts" do
|
||
SiteSetting.allowed_internal_hosts = %w[minio.local discoursetest.minio.local].join("|")
|
||
expect(fd("http://discoursetest.minio.local:9000").validate_uri_format).to eq(true)
|
||
end
|
||
end
|
||
end
|
||
|
||
describe "https cache" do
|
||
it "will cache https lookups" do
|
||
FinalDestination.clear_https_cache!("wikipedia.com")
|
||
|
||
fd_stub_request(:head, "http://wikipedia.com/image.png").to_return(
|
||
status: 302,
|
||
body: "",
|
||
headers: {
|
||
location: "https://wikipedia.com/image.png",
|
||
},
|
||
)
|
||
|
||
fd_stub_request(:head, "https://wikipedia.com/image.png")
|
||
|
||
fd("http://wikipedia.com/image.png").resolve
|
||
|
||
fd_stub_request(:head, "https://wikipedia.com/image2.png")
|
||
|
||
fd("http://wikipedia.com/image2.png").resolve
|
||
end
|
||
end
|
||
|
||
describe "#normalized_url" do
|
||
it "correctly normalizes url" do
|
||
fragment_url =
|
||
"https://eviltrout.com/2016/02/25/fixing-android-performance.html#discourse-comments"
|
||
|
||
expect(fd(fragment_url).normalized_url.to_s).to eq(fragment_url)
|
||
|
||
expect(fd("https://eviltrout.com?s=180&d=mm&r=g").normalized_url.to_s).to eq(
|
||
"https://eviltrout.com?s=180&d=mm&%23038;r=g",
|
||
)
|
||
|
||
expect(fd("http://example.com/?a=\11\15").normalized_url.to_s).to eq(
|
||
"http://example.com/?a=%09%0D",
|
||
)
|
||
|
||
expect(
|
||
fd("https://ru.wikipedia.org/wiki/%D0%A1%D0%B2%D0%BE%D0%B1%D0%BE").normalized_url.to_s,
|
||
).to eq("https://ru.wikipedia.org/wiki/%D0%A1%D0%B2%D0%BE%D0%B1%D0%BE")
|
||
|
||
expect(fd("https://ru.wikipedia.org/wiki/Свобо").normalized_url.to_s).to eq(
|
||
"https://ru.wikipedia.org/wiki/%D0%A1%D0%B2%D0%BE%D0%B1%D0%BE",
|
||
)
|
||
end
|
||
end
|
||
end
|