update-cdn-ips in github-pages-health-check-1.17.8

- old
+ new
@@ -6,17 +6,45 @@
 
 require "open-uri"
 require "json"
 
 SOURCES = {
-  :cloudflare => "https://www.cloudflare.com/ips-v4",
-  :fastly => "https://api.fastly.com/public-ip-list"
+  :cloudflare => ["https://www.cloudflare.com/ips-v4", "https://www.cloudflare.com/ips-v6"],
+  :fastly => ["https://api.fastly.com/public-ip-list"]
 }.freeze
 
-SOURCES.each do |source, url|
+def parse_fastly(data)
+  json_data = JSON.parse(data)
+  (json_data["addresses"] + json_data["ipv6_addresses"]).join("\n")
+end
+
+def parse_cloudflare(data)
+  data
+end
+
+def fetch_ips_from_cdn(urls)
+  urls.map do |url|
+    puts "Fetching #{url}..."
+    URI.parse(url).open.read
+  end.join("\n")
+end
+
+def update_cdn_file(source, data)
   file = "config/#{source}-ips.txt"
-  puts "Fetching #{url}..."
-  data = open(url).read
-  data = JSON.parse(data)["addresses"].join("\n") if source == :fastly
   File.write(file, data)
+  puts "Writing contents to #{file} and staging changes."
   `git add --verbose #{file}`
+end
+
+def parse_cdn_response(source, ips)
+  send("parse_#{source}", ips)
+end
+
+def update_cdn_ips(source, urls)
+  ips = fetch_ips_from_cdn(urls)
+  data = parse_cdn_response(source, ips)
+  update_cdn_file(source, data)
+end
+
+SOURCES.each do |source, urls|
+  update_cdn_ips(source, urls)
 end