Support /.well-known/host-meta.json (#32206)

spec/requests/well_known/host_meta_spec.rb

@@ -9,19 +9,39 @@ RSpec.describe 'The /.well-known/host-meta request' do
     expect(response)
       .to have_http_status(200)
       .and have_attributes(
-        media_type: 'application/xrd+xml',
-        body: host_meta_xml_template
+        media_type: 'application/xrd+xml'
+      )
+
+    doc = Nokogiri::XML(response.parsed_body)
+    expect(doc.at_xpath('/xrd:XRD/xrd:Link[@rel="lrdd"]/@template', 'xrd' => 'http://docs.oasis-open.org/ns/xri/xrd-1.0').value)
+      .to eq 'https://cb6e6126.ngrok.io/.well-known/webfinger?resource={uri}'
+  end
+
+  it 'returns http success with valid JSON response with .json extension' do
+    get '/.well-known/host-meta.json'
+
+    expect(response)
+      .to have_http_status(200)
+      .and have_attributes(
+        media_type: 'application/json'
+      )
+
+    expect(response.parsed_body)
+      .to include(
+        links: [
+          'rel' => 'lrdd',
+          'template' => 'https://cb6e6126.ngrok.io/.well-known/webfinger?resource={uri}',
+        ]
       )
   end
 
-  private
+  it 'returns http success with valid JSON response with Accept header' do
+    get '/.well-known/host-meta', headers: { 'Accept' => 'application/json' }
 
-  def host_meta_xml_template
-    <<~XML
-      <?xml version="1.0" encoding="UTF-8"?>
-      <XRD xmlns="http://docs.oasis-open.org/ns/xri/xrd-1.0">
-        <Link rel="lrdd" template="https://cb6e6126.ngrok.io/.well-known/webfinger?resource={uri}"/>
-      </XRD>
-    XML
+    expect(response)
+      .to have_http_status(200)
+      .and have_attributes(
+        media_type: 'application/json'
+      )
   end
 end