fix: intercept should raise error on unknown resource type and reques…

…t stage

fixes #313

lib/ferrum/network.rb

@@ -11,9 +11,10 @@ module Ferrum
   class Network
     CLEAR_TYPE = %i[traffic cache].freeze
     AUTHORIZE_TYPE = %i[server proxy].freeze
-    RESOURCE_TYPES = %w[Document Stylesheet Image Media Font Script TextTrack
-                        XHR Fetch EventSource WebSocket Manifest
-                        SignedExchange Ping CSPViolationReport Other].freeze
+    REQUEST_STAGES = %i[Request Response].freeze
+    RESOURCE_TYPES = %i[Document Stylesheet Image Media Font Script TextTrack
+                        XHR Fetch Prefetch EventSource WebSocket Manifest
+                        SignedExchange Ping CSPViolationReport Preflight Other].freeze
     AUTHORIZE_BLOCK_MISSING = "Block is missing, call `authorize(...) { |r| r.continue } " \
                               "or subscribe to `on(:request)` events before calling it"
     AUTHORIZE_TYPE_WRONG = ":type should be in #{AUTHORIZE_TYPE}"
@@ -187,11 +188,20 @@ def whitelist=(patterns)
     #   end
     #   browser.go_to("https://google.com")
     #
-    def intercept(pattern: "*", resource_type: nil)
+    def intercept(pattern: "*", resource_type: nil, request_stage: nil, handle_auth_requests: true)
       pattern = { urlPattern: pattern }
-      pattern[:resourceType] = resource_type if resource_type && RESOURCE_TYPES.include?(resource_type.to_s)
 
-      @page.command("Fetch.enable", handleAuthRequests: true, patterns: [pattern])
+      if resource_type && RESOURCE_TYPES.none?(resource_type.to_sym)
+        raise ArgumentError, "Unknown resource type '#{resource_type}' must be #{RESOURCE_TYPES.join(' | ')}"
+      end
+
+      if request_stage && REQUEST_STAGES.none?(request_stage.to_sym)
+        raise ArgumentError, "Unknown request stage '#{request_stage}' must be #{REQUEST_STAGES.join(' | ')}"
+      end
+
+      pattern[:resourceType] = resource_type if resource_type
+      pattern[:requestStage] = request_stage if request_stage
+      @page.command("Fetch.enable", patterns: [pattern], handleAuthRequests: handle_auth_requests)
     end
 
     #

spec/network_spec.rb

@@ -302,6 +302,55 @@
   end
 
   describe "#intercept" do
+    it "supports :pattern argument" do
+      network.intercept(pattern: "*/ferrum/frame_child")
+      page.on(:request) do |request|
+        request.respond(body: "<h1>hello</h1>")
+      end
+
+      page.go_to("/ferrum/frame_parent")
+
+      expect(network.status).to eq(200)
+      frame = page.at_xpath("//iframe").frame
+      expect(frame.body).to include("hello")
+    end
+
+    context "with :resource_type argument" do
+      it "raises an error with wrong type" do
+        expect { network.intercept(resource_type: :BlaBla) }.to raise_error(ArgumentError)
+      end
+
+      it "intercepts only given type" do
+        network.intercept(resource_type: :Document)
+        page.on(:request) do |request|
+          request.respond(body: "<h1>hello</h1>")
+        end
+
+        page.go_to("/ferrum/non_existing")
+
+        expect(network.status).to eq(200)
+        expect(page.body).to include("hello")
+      end
+    end
+
+    context "with :request_stage argument" do
+      it "raises an error with wrong stage" do
+        expect { network.intercept(request_stage: :BlaBla) }.to raise_error(ArgumentError)
+      end
+
+      it "intercepts only given stage" do
+        network.intercept(request_stage: :Response)
+        page.on(:request) do |request|
+          request.respond(body: "<h1>hello</h1>")
+        end
+
+        page.go_to("/ferrum/index")
+
+        expect(network.status).to eq(200)
+        expect(page.body).to include("hello")
+      end
+    end
+
     it "supports custom responses" do
       network.intercept
       page.on(:request) do |request|