Implement GitPitchTag (#4942)

app/liquid_tags/gitpitch_tag.rb

@@ -0,0 +1,38 @@
+class GitPitchTag < LiquidTagBase
+  PARTIAL = "liquids/gitpitch".freeze
+  URL_REGEXP = /(http|https):\/\/gitpitch.com\/[a-zA-Z0-9\-\/]*/.freeze
+
+  def initialize(tag_name, link, tokens)
+    super
+    @link = parse_link(link)
+  end
+
+  def render(_context)
+    ActionController::Base.new.render_to_string(
+      partial: PARTIAL,
+      locals: {
+        link: @link
+      },
+    )
+  end
+
+  private
+
+  def parse_link(link)
+    stripped_link = ActionController::Base.helpers.strip_tags(link)
+    the_link = stripped_link.split(" ").first
+    raise_error unless valid_link?(the_link)
+    the_link
+  end
+
+  def valid_link?(link)
+    link_no_space = link.delete(" ")
+    (link_no_space =~ URL_REGEXP)&.zero?
+  end
+
+  def raise_error
+    raise StandardError, "Invalid GitPitch URL"
+  end
+end
+
+Liquid::Template.register_tag("gitpitch", GitPitchTag)

app/views/liquids/_gitpitch.html.erb

@@ -0,0 +1,5 @@
+<iframe
+  height="450"
+  src="<%= link %>"
+  loading="lazy">
+</iframe>

app/views/pages/_editor_guide_text.html.erb

@@ -167,6 +167,11 @@
         </code></p>
       </dd>
     </dl>
+    <h3><strong>GitPitch Embed</strong></h3>
+    <p>All you need is the GitPitch link:</p>
+    <code>
+      {% gitpitch https://gitpitch.com/gitpitch/in-60-seconds %}
+    </code>
     <h3><strong>Video Embed</strong></h3>
     <p>All you need is the <code>id</code> from the URL.
       <ul>

spec/liquid_tags/gitpitch_tag_spec.rb

@@ -0,0 +1,47 @@
+require "rails_helper"
+
+RSpec.describe GitPitchTag, type: :liquid_tag do
+  describe "#link" do
+    let(:valid_links) do
+      [
+        "https://gitpitch.com/gitpitch/in-60-seconds",
+        "https://gitpitch.com/gitpitch/what-is-gitpitch",
+        "https://gitpitch.com/gitpitch/demo-deck",
+      ]
+    end
+
+    let(:bad_links) do
+      [
+        "//pastebin.com/raw/b77FrXUA#gist.github.com",
+        "https://gitpitch.com/gitpitch/github.com@evil.com",
+        "https://gitpitch.github.com.evil.com",
+        "https://github.com/string/string/raw/string/file",
+      ]
+    end
+
+    def generate_tag(link)
+      Liquid::Template.register_tag("gitpitch", GitPitchTag)
+      Liquid::Template.parse("{% gitpitch #{link} %}")
+    end
+
+    def generate_script(link)
+      html = <<~HTML
+        <iframe height="450" src="#{link}" loading="lazy"></iframe>
+      HTML
+      html.tr("\n", " ").delete(" ")
+    end
+
+    it "rejects invalid gitpitch url" do
+      expect do
+        generate_new_liquid("really_long_invalid_link")
+      end.to raise_error(StandardError)
+    end
+
+    it "accepts valid gitpitch url" do
+      valid_links.each do |link|
+        liquid = generate_tag(link)
+        expect(liquid.render.tr("\n", " ").delete(" ")).to eq(generate_script(link))
+      end
+    end
+  end
+end