Ensure some cookies don't cause failure

CHANGELOG.md

@@ -11,6 +11,7 @@ All notable changes to this project will be documented in this file. For info on
 ### Fixed
 
 - Avoid NoMethodError when accessing Rack::Session::Cookie without requiring delegate first. ([#1610](https://github.com/rack/rack/issues/1610), [@onigra](https://github.com/onigra))
+- Handle cookies with values that end in '=' ([#1645](https://github.com/rack/rack/pull/1645), [@lukaso](https://github.com/lukaso))
 
 ## [2.2.2] - 2020-02-11
 

lib/rack/mock.rb

@@ -254,9 +254,9 @@ def identify_cookie_attributes(cookie_filling)
       cookie_bits = cookie_filling.split(';')
       cookie_attributes = Hash.new
       cookie_attributes.store('value', cookie_bits[0].strip)
-      cookie_bits.each do |bit|
+      cookie_bits.drop(1).each do |bit|
         if bit.include? '='
-          cookie_attribute, attribute_value = bit.split('=')
+          cookie_attribute, attribute_value = bit.split('=',2)
           cookie_attributes.store(cookie_attribute.strip, attribute_value.strip)
           if cookie_attribute.include? 'max-age'
             cookie_attributes.store('expires', Time.now + attribute_value.strip.to_i)

test/spec_mock.rb

@@ -319,6 +319,12 @@
     secure_cookie.expires.must_be_nil
   end
 
+  it "parses cookie headers with equals sign at the end" do
+    res = Rack::MockRequest.new(->(env) { [200, {"Set-Cookie" => "__cf_bm=_somebase64encodedstringwithequalsatthened=; array=awesome"}, [""]] }).get("")
+    cookie = res.cookie("__cf_bm")
+    cookie.value[0].must_equal "_somebase64encodedstringwithequalsatthened="
+  end
+
   it "return nil if a non existent cookie is requested" do
     res = Rack::MockRequest.new(app).get("")
     res.cookie("i_dont_exist").must_be_nil