Implement MetadataFinder for Swift

swift/lib/dependabot/swift/metadata_finder.rb

@@ -9,6 +9,25 @@ class MetadataFinder < Dependabot::MetadataFinders::Base
       private
 
       def look_up_source
+        case new_source_type
+        when "git" then find_source_from_git_url
+        when "registry" then find_source_from_registry
+        else raise "Unexpected source type: #{new_source_type}"
+        end
+      end
+
+      def new_source_type
+        dependency.source_type
+      end
+
+      def find_source_from_git_url
+        info = dependency.source_details
+
+        url = info[:url] || info.fetch("url")
+        Source.from_url(url)
+      end
+
+      def find_source_from_registry
         raise NotImplementedError
       end
     end

swift/spec/dependabot/swift/metadata_finder_spec.rb

@@ -0,0 +1,75 @@
+# frozen_string_literal: true
+
+require "spec_helper"
+require "dependabot/dependency"
+require "dependabot/swift/metadata_finder"
+require_common_spec "metadata_finders/shared_examples_for_metadata_finders"
+
+RSpec.describe Dependabot::Swift::MetadataFinder do
+  it_behaves_like "a dependency metadata finder"
+
+  let(:credentials) do
+    [{
+      "type" => "git_source",
+      "host" => "github.com",
+      "username" => "x-access-token",
+      "password" => "token"
+    }]
+  end
+
+  let(:finder) do
+    described_class.new(dependency: dependency, credentials: credentials)
+  end
+
+  describe "#source_url" do
+    context "with a direct dependency" do
+      let(:dependency) do
+        Dependabot::Dependency.new(
+          name: "reactiveswift",
+          version: "7.1.1",
+          requirements: [{
+            file: "package.swfit",
+            requirement: "= 7.1.1",
+            groups: [],
+            source: {
+              "type" => "git",
+              "url" => "https://github.com/reactivecocoa/reactiveswift",
+              "ref" => "7.1.1",
+              "branch" => nil
+            }
+          }],
+          package_manager: "swift"
+        )
+      end
+
+      it "works" do
+        expect(finder.source_url).to eq "https://github.com/reactivecocoa/reactiveswift"
+      end
+    end
+
+    context "with an indirect dependency" do
+      let(:dependency) do
+        Dependabot::Dependency.new(
+          name: "reactiveswift",
+          version: "7.1.1",
+          requirements: [],
+          subdependency_metadata: [
+            {
+              source: {
+                "type" => "git",
+                "url" => "https://github.com/reactivecocoa/reactiveswift",
+                "ref" => "7.1.1",
+                "branch" => nil
+              }
+            }
+          ],
+          package_manager: "swift"
+        )
+      end
+
+      it "works" do
+        expect(finder.source_url).to eq "https://github.com/reactivecocoa/reactiveswift"
+      end
+    end
+  end
+end