diff --git a/Library/Homebrew/download_strategy.rb b/Library/Homebrew/download_strategy.rb
index 911deac410..d18def0a01 100644
--- a/Library/Homebrew/download_strategy.rb
+++ b/Library/Homebrew/download_strategy.rb
@@ -17,13 +17,12 @@ class AbstractDownloadStrategy
   attr_reader :meta, :name, :version
   attr_reader :shutup
 
-  def initialize(url, name, version, resource, mirrors: [])
+  def initialize(url, name, version, **meta)
     @url = url
     @name = name
     @version = version
-    @meta = resource.specs
+    @meta = meta
     @shutup = false
-    @mirrors = mirrors
     extend Pourable if meta[:bottle]
   end
 
@@ -91,7 +90,7 @@ end
 class VCSDownloadStrategy < AbstractDownloadStrategy
   REF_TYPES = [:tag, :branch, :revisions, :revision].freeze
 
-  def initialize(url, name, version, resource, mirrors: [])
+  def initialize(url, name, version, **meta)
     super
     @ref_type, @ref = extract_ref(meta)
     @revision = meta[:revision]
@@ -210,8 +209,9 @@ end
 class CurlDownloadStrategy < AbstractFileDownloadStrategy
   attr_reader :mirrors, :tarball_path, :temporary_path
 
-  def initialize(url, name, version, resource, mirrors: [])
+  def initialize(url, name, version, **meta)
     super
+    @mirrors = meta.fetch(:mirrors, [])
     @tarball_path = HOMEBREW_CACHE/"#{name}-#{version}#{ext}"
     @temporary_path = Pathname.new("#{cached_location}.incomplete")
   end
@@ -389,7 +389,7 @@ class GitHubPrivateRepositoryDownloadStrategy < CurlDownloadStrategy
   require "utils/formatter"
   require "utils/github"
 
-  def initialize(url, name, version, resource, mirrors: [])
+  def initialize(url, name, version, **meta)
     super
     parse_url_pattern
     set_github_token
@@ -495,7 +495,7 @@ end
 class ScpDownloadStrategy < AbstractFileDownloadStrategy
   attr_reader :tarball_path, :temporary_path
 
-  def initialize(url, name, version, resource, mirrors: [])
+  def initialize(url, name, version, **meta)
     super
     @tarball_path = HOMEBREW_CACHE/"#{name}-#{version}#{ext}"
     @temporary_path = Pathname.new("#{cached_location}.incomplete")
@@ -546,7 +546,7 @@ class ScpDownloadStrategy < AbstractFileDownloadStrategy
 end
 
 class SubversionDownloadStrategy < VCSDownloadStrategy
-  def initialize(url, name, version, resource, mirrors: [])
+  def initialize(url, name, version, **meta)
     super
     @url = @url.sub("svn+http://", "")
   end
@@ -631,7 +631,7 @@ class GitDownloadStrategy < VCSDownloadStrategy
     %r{http://llvm\.org},
   ].freeze
 
-  def initialize(url, name, version, resource, mirrors: [])
+  def initialize(url, name, version, **meta)
     super
     @ref_type ||= :branch
     @ref ||= "master"
@@ -803,7 +803,7 @@ class GitDownloadStrategy < VCSDownloadStrategy
 end
 
 class GitHubGitDownloadStrategy < GitDownloadStrategy
-  def initialize(url, name, version, resource, mirrors: [])
+  def initialize(url, name, version, **meta)
     super
 
     return unless %r{^https?://github\.com/(?<user>[^/]+)/(?<repo>[^/]+)\.git$} =~ @url
@@ -857,7 +857,7 @@ class GitHubGitDownloadStrategy < GitDownloadStrategy
 end
 
 class CVSDownloadStrategy < VCSDownloadStrategy
-  def initialize(url, name, version, resource, mirrors: [])
+  def initialize(url, name, version, **meta)
     super
     @url = @url.sub(%r{^cvs://}, "")
 
@@ -927,7 +927,7 @@ class CVSDownloadStrategy < VCSDownloadStrategy
 end
 
 class MercurialDownloadStrategy < VCSDownloadStrategy
-  def initialize(url, name, version, resource, mirrors: [])
+  def initialize(url, name, version, **meta)
     super
     @url = @url.sub(%r{^hg://}, "")
   end
@@ -983,7 +983,7 @@ class MercurialDownloadStrategy < VCSDownloadStrategy
 end
 
 class BazaarDownloadStrategy < VCSDownloadStrategy
-  def initialize(url, name, version, resource, mirrors: [])
+  def initialize(url, name, version, **meta)
     super
     @url.sub!(%r{^bzr://}, "")
     ENV["BZR_HOME"] = HOMEBREW_TEMP
@@ -1034,7 +1034,7 @@ class BazaarDownloadStrategy < VCSDownloadStrategy
 end
 
 class FossilDownloadStrategy < VCSDownloadStrategy
-  def initialize(url, name, version, resource, mirrors: [])
+  def initialize(url, name, version, **meta)
     super
     @url = @url.sub(%r{^fossil://}, "")
   end
diff --git a/Library/Homebrew/resource.rb b/Library/Homebrew/resource.rb
index 7dde0deca8..a4989ed058 100644
--- a/Library/Homebrew/resource.rb
+++ b/Library/Homebrew/resource.rb
@@ -17,16 +17,6 @@ class Resource
   # formula name before initialization of the formula
   attr_accessor :name
 
-  class Download
-    def initialize(resource)
-      @resource = resource
-    end
-
-    def specs
-      @resource.specs
-    end
-  end
-
   def initialize(name = nil, &block)
     @name = name
     @url = nil
@@ -45,8 +35,8 @@ class Resource
   end
 
   def downloader
-    download_strategy.new(url, download_name, version, Download.new(self),
-                          mirrors: mirrors.dup)
+    download_strategy.new(url, download_name, version,
+                          mirrors: mirrors.dup, **specs)
   end
 
   # Removes /s from resource names; this allows go package names
@@ -149,7 +139,7 @@ class Resource
     define_method(type) { |val| @checksum = Checksum.new(type, val) }
   end
 
-  def url(val = nil, specs = {})
+  def url(val = nil, **specs)
     return @url if val.nil?
     @url = val
     @specs.merge!(specs)
diff --git a/Library/Homebrew/test/download_strategies_spec.rb b/Library/Homebrew/test/download_strategies_spec.rb
index c84f332f8d..3389f922cd 100644
--- a/Library/Homebrew/test/download_strategies_spec.rb
+++ b/Library/Homebrew/test/download_strategies_spec.rb
@@ -1,13 +1,12 @@
 require "download_strategy"
 
 describe AbstractDownloadStrategy do
-  subject { described_class.new(url, name, version, resource) }
+  subject { described_class.new(url, name, version, **specs) }
 
   let(:specs) { {} }
   let(:name) { "foo" }
   let(:url) { "http://example.com/foo.tar.gz" }
   let(:version) { nil }
-  let(:resource) { double(Resource, specs: specs) }
   let(:args) { %w[foo bar baz] }
 
   specify "#source_modified_time" do
@@ -37,23 +36,21 @@ end
 describe VCSDownloadStrategy do
   let(:url) { "http://example.com/bar" }
   let(:version) { nil }
-  let(:resource) { double(Resource, specs: {}) }
 
   describe "#cached_location" do
     it "returns the path of the cached resource" do
       allow_any_instance_of(described_class).to receive(:cache_tag).and_return("foo")
-      downloader = described_class.new(url, "baz", version, resource)
+      downloader = described_class.new(url, "baz", version)
       expect(downloader.cached_location).to eq(HOMEBREW_CACHE/"baz--foo")
     end
   end
 end
 
 describe GitHubPrivateRepositoryDownloadStrategy do
-  subject { described_class.new(url, "foo", version, resource) }
+  subject { described_class.new(url, "foo", version) }
 
   let(:url) { "https://github.com/owner/repo/archive/1.1.5.tar.gz" }
   let(:version) { nil }
-  let(:resource) { double(Resource, specs: {}) }
 
   before do
     ENV["HOMEBREW_GITHUB_API_TOKEN"] = "token"
@@ -74,11 +71,10 @@ describe GitHubPrivateRepositoryDownloadStrategy do
 end
 
 describe GitHubPrivateRepositoryReleaseDownloadStrategy do
-  subject { described_class.new(url, "foo", version, resource) }
+  subject { described_class.new(url, "foo", version) }
 
   let(:url) { "https://github.com/owner/repo/releases/download/tag/foo_v0.1.0_darwin_amd64.tar.gz" }
   let(:version) { nil }
-  let(:resource) { double(Resource, url: url, specs: {}) }
 
   before do
     ENV["HOMEBREW_GITHUB_API_TOKEN"] = "token"
@@ -126,12 +122,11 @@ describe GitHubPrivateRepositoryReleaseDownloadStrategy do
 end
 
 describe GitHubGitDownloadStrategy do
-  subject { described_class.new(url, name, version, resource) }
+  subject { described_class.new(url, name, version) }
 
   let(:name) { "brew" }
   let(:url) { "https://github.com/homebrew/brew.git" }
   let(:version) { nil }
-  let(:resource) { double(Resource, specs: {}) }
 
   it "parses the URL and sets the corresponding instance variables" do
     expect(subject.instance_variable_get(:@user)).to eq("homebrew")
@@ -140,12 +135,11 @@ describe GitHubGitDownloadStrategy do
 end
 
 describe GitDownloadStrategy do
-  subject { described_class.new(url, name, version, resource) }
+  subject { described_class.new(url, name, version) }
 
   let(:name) { "baz" }
   let(:url) { "https://github.com/homebrew/foo" }
   let(:version) { nil }
-  let(:resource) { double(Resource, specs: {}) }
   let(:cached_location) { subject.cached_location }
 
   before do
@@ -187,7 +181,6 @@ describe GitDownloadStrategy do
   describe "#fetch_last_commit" do
     let(:url) { "file://#{remote_repo}" }
     let(:version) { Version.create("HEAD") }
-    let(:resource) { double(Resource, url: url, mirrors: [], specs: {}, version: version) }
     let(:remote_repo) { HOMEBREW_PREFIX/"remote_repo" }
 
     before { remote_repo.mkpath }
@@ -208,15 +201,14 @@ describe GitDownloadStrategy do
 end
 
 describe S3DownloadStrategy do
-  subject { described_class.new(url, name, version, resource) }
+  subject { described_class.new(url, name, version) }
 
   let(:name) { "foo" }
   let(:url) { "http://bucket.s3.amazonaws.com/foo.tar.gz" }
   let(:version) { nil }
-  let(:resource) { double(Resource, specs: {}) }
 
   describe "#_fetch" do
-    subject { described_class.new(url, name, version, resource)._fetch }
+    subject { described_class.new(url, name, version)._fetch }
 
     context "when given Bad S3 URL" do
       let(:url) { "http://example.com/foo.tar.gz" }
@@ -231,19 +223,19 @@ describe S3DownloadStrategy do
 end
 
 describe CurlDownloadStrategy do
-  subject { described_class.new(url, name, version, resource) }
+  subject { described_class.new(url, name, version, **specs) }
 
   let(:name) { "foo" }
   let(:url) { "http://example.com/foo.tar.gz" }
   let(:version) { nil }
-  let(:resource) { double(Resource, specs: { user: "download:123456" }) }
+  let(:specs) { { user: "download:123456" } }
 
   it "parses the opts and sets the corresponding args" do
     expect(subject.send(:_curl_opts)).to eq(["--user", "download:123456"])
   end
 
   describe "#tarball_path" do
-    subject { described_class.new(url, name, version, resource).tarball_path }
+    subject { described_class.new(url, name, version, **specs).tarball_path }
 
     context "when URL ends with file" do
       it { is_expected.to eq(HOMEBREW_CACHE/"foo-.tar.gz") }
@@ -258,11 +250,10 @@ describe CurlDownloadStrategy do
 end
 
 describe ScpDownloadStrategy do
-  subject { described_class.new(url, name, version, resource) }
+  subject { described_class.new(url, name, version) }
   let(:name) { "foo" }
   let(:url) { "scp://example.com/foo.tar.gz" }
   let(:version) { nil }
-  let(:resource) { double(Resource, specs: {}) }
 
   describe "#initialize" do
     invalid_urls = %w[