Add get_copy_reference and save_copy_reference methods

lib/dropbox/client.rb

@@ -72,6 +72,17 @@ def get_account_batch(account_ids)
       resp.map { |a| BasicAccount.new(a) }
     end
 
+    # Get a copy reference to a file or folder.
+    #
+    # @param [String] path
+    # @return [Dropbox::Metadata] metadata
+    # @return [String] copy_reference
+    def get_copy_reference(path)
+      resp = request('/files/copy_reference/get', path: path)
+      metadata = parse_tagged_response(resp['metadata'])
+      return metadata, resp['copy_reference']
+    end
+
     # Get information about the current user's account.
     #
     # @return [Dropbox::FullAccount]
@@ -177,6 +188,16 @@ def revoke_token
       raise APIError.new(r) if r.code != 200
     end
 
+    # Save a copy reference to the user's Dropbox.
+    #
+    # @param [String] copy_reference
+    # @param [String] path
+    # @return [Dropbox::Metadata] metadata
+    def save_copy_reference(copy_reference, path)
+      resp = request('/files/copy_reference/save', copy_reference: copy_reference, path: path)
+      parse_tagged_response(resp['metadata'])
+    end
+
     # Save a specified URL into a file in user's Dropbox.
     #
     # @param [String] path

test/test_files.rb

@@ -68,6 +68,28 @@ def test_download_error
     end
   end
 
+# TODO: Getting 500 errors from the API. Mention it to Dropbox.
+#
+#   def test_get_save_copy_reference
+#     meta, ref = @client.get_copy_reference('/file.txt')
+#
+#     assert meta.is_a?(Dropbox::FileMetadata)
+#     assert ref.is_a?(String)
+#     assert_match /^[a-z0-9]+$/i, ref
+#
+#     saved_meta = @client.save_copy_reference('/copied_file.txt')
+#
+#     assert meta.is_a?(Dropbox::FileMetadata)
+#     assert_equal 'copied_file.txt', file.name
+#     assert_equal 22, file.size
+#   end
+
+  def test_get_copy_reference_error
+    assert_raises(Dropbox::APIError) do
+      @client.get_copy_reference('/not_found')
+    end
+  end
+
   def test_get_metadata
     file = @client.get_metadata('/file.txt')
 
@@ -201,6 +223,12 @@ def test_save_url_error
     end
   end
 
+  def test_save_copy_reference_error
+    assert_raises(Dropbox::APIError) do
+      @client.save_copy_reference('invalid', '/saved_copy_reference.txt')
+    end
+  end
+
   def test_search
     matches = @client.search('empty')
     assert_equal 2, matches.length