Add URI.from_json_object_key? and URI#to_json_object_key (#14834)

spec/std/uri/json_spec.cr

@@ -0,0 +1,14 @@
+require "spec"
+require "uri/json"
+
+describe "URI" do
+  describe "serializes" do
+    it "#to_json" do
+      URI.parse("https://example.com").to_json.should eq %q("https://example.com")
+    end
+
+    it "from_json_object_key?" do
+      URI.from_json_object_key?("https://example.com").should eq(URI.parse("https://example.com"))
+    end
+  end
+end

src/uri/json.cr

@@ -25,4 +25,18 @@ class URI
   def to_json(builder : JSON::Builder)
     builder.string self
   end
+
+  # Deserializes the given JSON *key* into a `URI`
+  #
+  # NOTE: `require "uri/json"` is required to opt-in to this feature.
+  def self.from_json_object_key?(key : String) : URI?
+    parse key
+  rescue URI::Error
+    nil
+  end
+
+  # :nodoc:
+  def to_json_object_key : String
+    to_s
+  end
 end