/
final_destination_spec.rb
627 lines (509 loc) · 23 KB
/
final_destination_spec.rb
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# frozen_string_literal: true
require 'final_destination'
RSpec.describe FinalDestination do
let(:opts) do
{
ignore_redirects: ['https://ignore-me.com'],
force_get_hosts: ['https://force.get.com', 'https://*.ihaveawildcard.com/'],
preserve_fragment_url_hosts: ['https://eviltrout.com'],
# avoid IP lookups in test
lookup_ip: lambda do |host|
case host
when 'eviltrout.com' then '52.84.143.152'
when 'particularly.eviltrout.com' then '52.84.143.152'
when 'codinghorror.com' then '91.146.108.148'
when 'discourse.org' then '104.25.152.10'
when 'some_thing.example.com' then '104.25.152.10'
when 'private-host.com' then '192.168.10.1'
when 'internal-ipv6.com' then '2001:abc:de:01:3:3d0:6a65:c2bf'
when 'ignore-me.com' then '53.84.143.152'
when 'force.get.com' then '22.102.29.40'
when 'any-subdomain.ihaveawildcard.com' then '104.25.152.11'
when 'wikipedia.com' then '1.2.3.4'
else
_as_ip = IPAddr.new(host)
host
end
end
}
end
let(:doc_response) do
{
status: 200,
headers: { "Content-Type" => "text/html" }
}
end
let(:image_response) do
{
status: 200,
headers: { "Content-Type" => "image/jpeg" }
}
end
let(:body_response) do
{
status: 200,
body: "<body>test</body>"
}
end
def canonical_follow(from, dest)
stub_request(:get, from).to_return(
status: 200,
body: "<head><link rel=\"canonical\" href=\"#{dest}\"></head>"
)
end
def redirect_response(from, dest)
stub_request(:head, from).to_return(
status: 302,
headers: { "Location" => dest }
)
end
def fd(url)
FinalDestination.new(url, opts)
end
it 'correctly parses ignored hostnames' do
fd = FinalDestination.new('https://meta.discourse.org',
ignore_redirects: ['http://google.com', 'youtube.com', 'https://meta.discourse.org', '://bing.com']
)
expect(fd.ignored).to eq(['test.localhost', 'google.com', 'meta.discourse.org'])
end
describe '.resolve' do
it "has a ready status code before anything happens" do
expect(fd('https://eviltrout.com').status).to eq(:ready)
end
it "returns nil for an invalid url" do
expect(fd(nil).resolve).to be_nil
expect(fd('asdf').resolve).to be_nil
end
it "returns nil when read timeouts" do
Excon.expects(:public_send).raises(Excon::Errors::Timeout)
expect(fd('https://discourse.org').resolve).to eq(nil)
end
context "without redirects" do
before do
stub_request(:head, "https://eviltrout.com").to_return(doc_response)
end
it "returns the final url" do
final = FinalDestination.new('https://eviltrout.com', opts)
expect(final.resolve.to_s).to eq('https://eviltrout.com')
expect(final.redirected?).to eq(false)
expect(final.status).to eq(:resolved)
end
end
it "ignores redirects" do
final = FinalDestination.new('https://ignore-me.com/some-url', opts)
expect(final.resolve.to_s).to eq('https://ignore-me.com/some-url')
expect(final.redirected?).to eq(false)
expect(final.status).to eq(:resolved)
end
context "with underscores in URLs" do
before do
stub_request(:head, 'https://some_thing.example.com').to_return(doc_response)
end
it "doesn't raise errors with underscores in urls" do
final = FinalDestination.new('https://some_thing.example.com', opts)
expect(final.resolve.to_s).to eq('https://some_thing.example.com')
expect(final.redirected?).to eq(false)
expect(final.status).to eq(:resolved)
end
end
context "with a couple of redirects" do
before do
redirect_response("https://eviltrout.com", "https://codinghorror.com/blog")
redirect_response("https://codinghorror.com/blog", "https://discourse.org")
stub_request(:head, "https://discourse.org").to_return(doc_response)
end
it "returns the final url" do
final = FinalDestination.new('https://eviltrout.com', opts)
expect(final.resolve.to_s).to eq('https://discourse.org')
expect(final.redirected?).to eq(true)
expect(final.status).to eq(:resolved)
end
end
context "with too many redirects" do
before do
redirect_response("https://eviltrout.com", "https://codinghorror.com/blog")
redirect_response("https://codinghorror.com/blog", "https://discourse.org")
stub_request(:head, "https://discourse.org").to_return(doc_response)
end
it "returns the final url" do
final = FinalDestination.new('https://eviltrout.com', opts.merge(max_redirects: 1))
expect(final.resolve).to be_nil
expect(final.redirected?).to eq(true)
expect(final.status).to eq(:too_many_redirects)
end
end
context "with a redirect to an internal IP" do
before do
redirect_response("https://eviltrout.com", "https://private-host.com")
stub_request(:head, "https://private-host.com").to_return(doc_response)
end
it "returns the final url" do
final = FinalDestination.new('https://eviltrout.com', opts)
expect(final.resolve).to be_nil
expect(final.redirected?).to eq(true)
expect(final.status).to eq(:invalid_address)
end
end
context "with a redirect to login path" do
before do
redirect_response("https://eviltrout.com/t/xyz/1", "https://eviltrout.com/login")
end
it "does not follow redirect" do
final = FinalDestination.new('https://eviltrout.com/t/xyz/1', opts)
expect(final.resolve.to_s).to eq('https://eviltrout.com/t/xyz/1')
expect(final.redirected?).to eq(false)
expect(final.status).to eq(:resolved)
end
end
it 'raises error when response is too big' do
stub_const(described_class, "MAX_REQUEST_SIZE_BYTES", 1) do
stub_request(:get, "https://codinghorror.com/blog").to_return(body_response)
final = FinalDestination.new('https://codinghorror.com/blog', opts.merge(follow_canonical: true))
expect { final.resolve }.to raise_error(Excon::Errors::ExpectationFailed, "response size too big: https://codinghorror.com/blog")
end
end
it 'raises error when response is too slow' do
stub_request(:get, "https://codinghorror.com/blog").to_return(lambda { |request| freeze_time(11.seconds.from_now) ; body_response })
final = FinalDestination.new('https://codinghorror.com/blog', opts.merge(follow_canonical: true))
expect { final.resolve }.to raise_error(Excon::Errors::ExpectationFailed, "connect timeout reached: https://codinghorror.com/blog")
end
context 'when following canonical links' do
it 'resolves the canonical link as the final destination' do
canonical_follow("https://eviltrout.com", "https://codinghorror.com/blog")
stub_request(:head, "https://codinghorror.com/blog").to_return(doc_response)
final = FinalDestination.new('https://eviltrout.com', opts.merge(follow_canonical: true))
expect(final.resolve.to_s).to eq("https://codinghorror.com/blog")
expect(final.redirected?).to eq(false)
expect(final.status).to eq(:resolved)
end
it 'resolves the canonical link when the URL is relative' do
host = "https://codinghorror.com"
canonical_follow("#{host}/blog", "/blog/canonical")
stub_request(:head, "#{host}/blog/canonical").to_return(doc_response)
final = FinalDestination.new("#{host}/blog", opts.merge(follow_canonical: true))
expect(final.resolve.to_s).to eq("#{host}/blog/canonical")
expect(final.redirected?).to eq(false)
expect(final.status).to eq(:resolved)
end
it 'resolves the canonical link when the URL is relative and does not start with the / symbol' do
host = "https://codinghorror.com"
canonical_follow("#{host}/blog", "blog/canonical")
stub_request(:head, "#{host}/blog/canonical").to_return(doc_response)
final = FinalDestination.new("#{host}/blog", opts.merge(follow_canonical: true))
expect(final.resolve.to_s).to eq("#{host}/blog/canonical")
expect(final.redirected?).to eq(false)
expect(final.status).to eq(:resolved)
end
it "does not follow the canonical link if it's the same as the current URL" do
canonical_follow("https://eviltrout.com", "https://eviltrout.com")
final = FinalDestination.new('https://eviltrout.com', opts.merge(follow_canonical: true))
expect(final.resolve.to_s).to eq("https://eviltrout.com")
expect(final.redirected?).to eq(false)
expect(final.status).to eq(:resolved)
end
it "does not follow the canonical link if it's invalid" do
canonical_follow("https://eviltrout.com", "")
final = FinalDestination.new('https://eviltrout.com', opts.merge(follow_canonical: true))
expect(final.resolve.to_s).to eq("https://eviltrout.com")
expect(final.redirected?).to eq(false)
expect(final.status).to eq(:resolved)
end
end
context "when forcing GET" do
before do
stub_request(:head, 'https://force.get.com/posts?page=4')
stub_request(:get, 'https://force.get.com/posts?page=4')
stub_request(:get, 'https://any-subdomain.ihaveawildcard.com/some/other/content')
stub_request(:head, 'https://eviltrout.com/posts?page=2')
stub_request(:get, 'https://eviltrout.com/posts?page=2')
stub_request(:head, 'https://particularly.eviltrout.com/has/a/secret/plan')
stub_request(:get, 'https://particularly.eviltrout.com/has/a/secret/plan')
end
it "will do a GET when forced" do
final = FinalDestination.new('https://force.get.com/posts?page=4', opts)
expect(final.resolve.to_s).to eq('https://force.get.com/posts?page=4')
expect(final.status).to eq(:resolved)
expect(WebMock).to have_requested(:get, 'https://force.get.com/posts?page=4')
expect(WebMock).to_not have_requested(:head, 'https://force.get.com/posts?page=4')
end
it "will do a HEAD if not forced" do
final = FinalDestination.new('https://eviltrout.com/posts?page=2', opts)
expect(final.resolve.to_s).to eq('https://eviltrout.com/posts?page=2')
expect(final.status).to eq(:resolved)
expect(WebMock).to_not have_requested(:get, 'https://eviltrout.com/posts?page=2')
expect(WebMock).to have_requested(:head, 'https://eviltrout.com/posts?page=2')
end
it "will do a GET when forced on a wildcard subdomain" do
final = FinalDestination.new('https://any-subdomain.ihaveawildcard.com/some/other/content', opts)
expect(final.resolve.to_s).to eq('https://any-subdomain.ihaveawildcard.com/some/other/content')
expect(final.status).to eq(:resolved)
expect(WebMock).to have_requested(:get, 'https://any-subdomain.ihaveawildcard.com/some/other/content')
expect(WebMock).to_not have_requested(:head, 'https://any-subdomain.ihaveawildcard.com/some/other/content')
end
it "will do a HEAD if on a subdomain of a forced get domain without a wildcard" do
final = FinalDestination.new('https://particularly.eviltrout.com/has/a/secret/plan', opts)
expect(final.resolve.to_s).to eq('https://particularly.eviltrout.com/has/a/secret/plan')
expect(final.status).to eq(:resolved)
expect(WebMock).to_not have_requested(:get, 'https://particularly.eviltrout.com/has/a/secret/plan')
expect(WebMock).to have_requested(:head, 'https://particularly.eviltrout.com/has/a/secret/plan')
end
end
context "when HEAD not supported" do
before do
stub_request(:get, 'https://eviltrout.com').to_return(
status: 301,
headers: {
"Location" => 'https://discourse.org',
'Set-Cookie' => 'evil=trout'
}
)
stub_request(:head, 'https://discourse.org')
end
context "when the status code is 405" do
before do
stub_request(:head, 'https://eviltrout.com').to_return(status: 405)
end
it "will try a GET" do
final = FinalDestination.new('https://eviltrout.com', opts)
expect(final.resolve.to_s).to eq('https://discourse.org')
expect(final.status).to eq(:resolved)
expect(final.cookie).to eq('evil=trout')
end
end
context "when the status code is 501" do
before do
stub_request(:head, 'https://eviltrout.com').to_return(status: 501)
end
it "will try a GET" do
final = FinalDestination.new('https://eviltrout.com', opts)
expect(final.resolve.to_s).to eq('https://discourse.org')
expect(final.status).to eq(:resolved)
expect(final.cookie).to eq('evil=trout')
end
end
it "correctly extracts cookies during GET" do
stub_request(:head, "https://eviltrout.com").to_return(status: 405)
stub_request(:get, "https://eviltrout.com")
.to_return(status: 302, body: "" , headers: {
"Location" => "https://eviltrout.com",
"Set-Cookie" => ["foo=219ffwef9w0f; expires=Mon, 19-Feb-2018 10:44:24 GMT; path=/; domain=eviltrout.com",
"bar=1",
"baz=2; expires=Tue, 19-Feb-2019 10:14:24 GMT; path=/; domain=eviltrout.com"]
})
stub_request(:head, "https://eviltrout.com")
.with(headers: { "Cookie" => "bar=1; baz=2; foo=219ffwef9w0f" })
final = FinalDestination.new("https://eviltrout.com", opts)
expect(final.resolve.to_s).to eq("https://eviltrout.com")
expect(final.status).to eq(:resolved)
expect(final.cookie).to eq("bar=1; baz=2; foo=219ffwef9w0f")
end
end
it "should use the correct format for cookies when there is only one cookie" do
stub_request(:head, "https://eviltrout.com")
.to_return(status: 302, headers: {
"Location" => "https://eviltrout.com",
"Set-Cookie" => "foo=219ffwef9w0f; expires=Mon, 19-Feb-2018 10:44:24 GMT; path=/; domain=eviltrout.com"
})
stub_request(:head, "https://eviltrout.com")
.with(headers: { "Cookie" => "foo=219ffwef9w0f" })
final = FinalDestination.new("https://eviltrout.com", opts)
expect(final.resolve.to_s).to eq("https://eviltrout.com")
expect(final.status).to eq(:resolved)
expect(final.cookie).to eq("foo=219ffwef9w0f")
end
it "should use the correct format for cookies when there are multiple cookies" do
stub_request(:head, "https://eviltrout.com")
.to_return(status: 302, headers: {
"Location" => "https://eviltrout.com",
"Set-Cookie" => ["foo=219ffwef9w0f; expires=Mon, 19-Feb-2018 10:44:24 GMT; path=/; domain=eviltrout.com",
"bar=1",
"baz=2; expires=Tue, 19-Feb-2019 10:14:24 GMT; path=/; domain=eviltrout.com"]
})
stub_request(:head, "https://eviltrout.com")
.with(headers: { "Cookie" => "bar=1; baz=2; foo=219ffwef9w0f" })
final = FinalDestination.new("https://eviltrout.com", opts)
expect(final.resolve.to_s).to eq("https://eviltrout.com")
expect(final.status).to eq(:resolved)
expect(final.cookie).to eq("bar=1; baz=2; foo=219ffwef9w0f")
end
it "persists fragment url" do
origin_url = "https://eviltrout.com/origin/lib/code/foobar.rb"
upstream_url = "https://eviltrout.com/upstream/lib/code/foobar.rb"
redirect_response(origin_url, upstream_url)
stub_request(:head, upstream_url).to_return(doc_response)
final = FinalDestination.new("#{origin_url}#L154-L205", opts)
expect(final.resolve.to_s).to eq("#{upstream_url}#L154-L205")
expect(final.status).to eq(:resolved)
end
context "with content_type" do
before do
stub_request(:head, "https://eviltrout.com/this/is/an/image").to_return(image_response)
end
it "returns a content_type" do
final = FinalDestination.new("https://eviltrout.com/this/is/an/image", opts)
expect(final.resolve.to_s).to eq("https://eviltrout.com/this/is/an/image")
expect(final.content_type).to eq("image/jpeg")
expect(final.status).to eq(:resolved)
end
end
end
describe '#get' do
let(:fd) { FinalDestination.new("http://wikipedia.com", opts.merge(verbose: true)) }
before do
described_class.clear_https_cache!("wikipedia.com")
end
context "when there is a redirect" do
before 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: {})
end
after do
WebMock.reset!
end
it "correctly streams" do
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
end
context "when there is a timeout" do
subject(:get) { fd.get {} }
before do
fd.stubs(:safe_session).raises(Timeout::Error)
end
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
end
describe '.validate_uri' do
context "with host lookups" do
it "works for various hosts" do
expect(fd('https://private-host.com').validate_uri).to eq(false)
expect(fd('https://eviltrout.com:443').validate_uri).to eq(true)
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 ports" do
expect(fd('http://eviltrout.com:21').validate_uri_format).to eq(false)
expect(fd('https://eviltrout.com:8000').validate_uri_format).to eq(false)
end
it "returns true for valid 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
end
describe ".is_dest_valid" do
it "returns false for a valid ipv4" do
expect(fd("https://52.84.143.67").is_dest_valid?).to eq(true)
expect(fd("https://104.25.153.10").is_dest_valid?).to eq(true)
end
it "returns false for short ip" do
lookup = lambda do |host|
# How IPs are looked up for single digits
if host == "0"
"0.0.0.0"
elsif host == "1"
"0.0.0.1"
end
end
expect(FinalDestination.new('https://0/logo.png', lookup_ip: lookup).is_dest_valid?).to eq(false)
expect(FinalDestination.new('https://1/logo.png', lookup_ip: lookup).is_dest_valid?).to eq(false)
end
it "returns false for private ipv4" do
expect(fd("https://127.0.0.1").is_dest_valid?).to eq(false)
expect(fd("https://192.168.1.3").is_dest_valid?).to eq(false)
expect(fd("https://10.0.0.5").is_dest_valid?).to eq(false)
expect(fd("https://172.16.0.1").is_dest_valid?).to eq(false)
end
it "returns false for IPV6 via site settings" do
SiteSetting.blocked_ip_blocks = '2001:abc:de::/48|2002:abc:de::/48'
expect(fd('https://[2001:abc:de:01:0:3f0:6a65:c2bf]').is_dest_valid?).to eq(false)
expect(fd('https://[2002:abc:de:01:0:3f0:6a65:c2bf]').is_dest_valid?).to eq(false)
expect(fd('https://internal-ipv6.com').is_dest_valid?).to eq(false)
expect(fd('https://[2003:abc:de:01:0:3f0:6a65:c2bf]').is_dest_valid?).to eq(true)
end
it "ignores invalid ranges" do
SiteSetting.blocked_ip_blocks = '2001:abc:de::/48|eviltrout'
expect(fd('https://[2001:abc:de:01:0:3f0:6a65:c2bf]').is_dest_valid?).to eq(false)
end
it "returns true for public ipv6" do
expect(fd("https://[2001:470:1:3a8::251]").is_dest_valid?).to eq(true)
end
it "returns false for private ipv6" do
expect(fd("https://[fdd7:b450:d4d1:6b44::1]").is_dest_valid?).to eq(false)
end
it "returns true for the base uri" do
SiteSetting.force_hostname = "final-test.example.com"
expect(fd("https://final-test.example.com/onebox").is_dest_valid?).to eq(true)
end
it "returns true for the S3 CDN url" do
SiteSetting.enable_s3_uploads = true
SiteSetting.s3_cdn_url = "https://s3.example.com"
expect(fd("https://s3.example.com/some/thing").is_dest_valid?).to eq(true)
end
it "returns true for the CDN url" do
GlobalSetting.stubs(:cdn_url).returns("https://cdn.example.com/discourse")
expect(fd("https://cdn.example.com/some/asset").is_dest_valid?).to eq(true)
end
it 'supports allowlisting via a site setting' do
SiteSetting.allowed_internal_hosts = 'private-host.com'
expect(fd("https://private-host.com/some/url").is_dest_valid?).to eq(true)
end
end
describe "https cache" do
it 'will cache https lookups' do
FinalDestination.clear_https_cache!("wikipedia.com")
stub_request(:head, "http://wikipedia.com/image.png")
.to_return(status: 302, body: "", headers: { location: 'https://wikipedia.com/image.png' })
stub_request(:head, "https://wikipedia.com/image.png")
fd('http://wikipedia.com/image.png').resolve
stub_request(:head, "https://wikipedia.com/image2.png")
fd('http://wikipedia.com/image2.png').resolve
end
end
describe "#escape_url" do
it "correctly escapes url" do
fragment_url = "https://eviltrout.com/2016/02/25/fixing-android-performance.html#discourse-comments"
expect(fd(fragment_url).escape_url.to_s).to eq(fragment_url)
expect(fd("https://eviltrout.com?s=180&d=mm&r=g").escape_url.to_s)
.to eq("https://eviltrout.com?s=180&d=mm&%23038;r=g")
expect(fd("http://example.com/?a=\11\15").escape_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").escape_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').escape_url.to_s)
.to eq('https://ru.wikipedia.org/wiki/%D0%A1%D0%B2%D0%BE%D0%B1%D0%BE')
end
end
end