Ruby: Avoid double escaping path items (#3093)

`URI.encode` is obsolete. `CGI.escape`, `URI.encode_www_form` or
`URI.encode_www_form_component` are recommended instead.
https://ruby-doc.org/stdlib-2.6/libdoc/uri/rdoc/URI/Escape.html#method-i-escape

URI.encode has different behaviour to CGI.escape:

```ruby
URI.encode('hello/world?test%string')
=> "hello/world?test%25string"
CGI.escape('hello/world?test%string')
=> "hello%2Fworld%3Ftest%25string"
```

I recently raised pull request #3039
201cbdc

That pull request escapes path items at insertion.

Before either pull request, the path item 'hello?world' would go into
the URL as 'hello?world'. That behaviour was insecure as if an attacker
could control the path item value, they could change the URL the
application connected to.

After #3039 'hello?world' would go in as 'hello%253Fworld'. This was
safer than before, but it's still not correct.
If I'd realised at the time, I would have made it correct at the time.

What this pull request does is make it go in as 'hello%35world', which
is correct.

ApiClient::build_request_url was URI.encoding the whole path.
This wasn't protecting against all undesirable characters in the path
items, but was escaping % characters a 2nd time which was unhelpful.

I have additionally removed URI.encode from Configuration::base_url as I
can't see any benefit it could be bringing.
There is no justification for it in the commit where it was originally
added: 47c8597

modules/openapi-generator/src/main/resources/ruby-client/api.mustache

@@ -2,7 +2,6 @@
 {{> api_info}}
 =end
 
-require 'uri'
 require 'cgi'
 
 module {{moduleName}}

modules/openapi-generator/src/main/resources/ruby-client/api_client.mustache

@@ -7,7 +7,6 @@ require 'json'
 require 'logger'
 require 'tempfile'
 require 'typhoeus'
-require 'uri'
 
 module {{moduleName}}
   class ApiClient
@@ -256,7 +255,7 @@ module {{moduleName}}
     def build_request_url(path)
       # Add leading and trailing slashes to path
       path = "/#{path}".gsub(/\/+/, '/')
-      URI.encode(@config.base_url + path)
+      @config.base_url + path
     end
 
     # Builds the HTTP request body

modules/openapi-generator/src/main/resources/ruby-client/configuration.mustache

@@ -2,8 +2,6 @@
 {{> api_info}}
 =end
 
-require 'uri'
-
 module {{moduleName}}
   class Configuration
     # Defines url scheme
@@ -166,8 +164,7 @@ module {{moduleName}}
     end
 
     def base_url
-      url = "#{scheme}://#{[host, base_path].join('/').gsub(/\/+/, '/')}".sub(/\/+\z/, '')
-      URI.encode(url)
+      "#{scheme}://#{[host, base_path].join('/').gsub(/\/+/, '/')}".sub(/\/+\z/, '')
     end
 
     # Gets API key (with prefix if set).

samples/client/petstore/ruby/lib/petstore/api/another_fake_api.rb

@@ -10,7 +10,6 @@
 
 =end
 
-require 'uri'
 require 'cgi'
 
 module Petstore

samples/client/petstore/ruby/lib/petstore/api/fake_api.rb

@@ -10,7 +10,6 @@
 
 =end
 
-require 'uri'
 require 'cgi'
 
 module Petstore

samples/client/petstore/ruby/lib/petstore/api/fake_classname_tags123_api.rb

@@ -10,7 +10,6 @@
 
 =end
 
-require 'uri'
 require 'cgi'
 
 module Petstore

samples/client/petstore/ruby/lib/petstore/api/pet_api.rb

@@ -10,7 +10,6 @@
 
 =end
 
-require 'uri'
 require 'cgi'
 
 module Petstore

samples/client/petstore/ruby/lib/petstore/api/store_api.rb

@@ -10,7 +10,6 @@
 
 =end
 
-require 'uri'
 require 'cgi'
 
 module Petstore

samples/client/petstore/ruby/lib/petstore/api/user_api.rb

@@ -10,7 +10,6 @@
 
 =end
 
-require 'uri'
 require 'cgi'
 
 module Petstore

samples/client/petstore/ruby/lib/petstore/api_client.rb

@@ -15,7 +15,6 @@
 require 'logger'
 require 'tempfile'
 require 'typhoeus'
-require 'uri'
 
 module Petstore
   class ApiClient
@@ -262,7 +261,7 @@ def sanitize_filename(filename)
     def build_request_url(path)
       # Add leading and trailing slashes to path
       path = "/#{path}".gsub(/\/+/, '/')
-      URI.encode(@config.base_url + path)
+      @config.base_url + path
     end
 
     # Builds the HTTP request body

samples/client/petstore/ruby/lib/petstore/configuration.rb

@@ -10,8 +10,6 @@
 
 =end
 
-require 'uri'
-
 module Petstore
   class Configuration
     # Defines url scheme
@@ -174,8 +172,7 @@ def base_path=(base_path)
     end
 
     def base_url
-      url = "#{scheme}://#{[host, base_path].join('/').gsub(/\/+/, '/')}".sub(/\/+\z/, '')
-      URI.encode(url)
+      "#{scheme}://#{[host, base_path].join('/').gsub(/\/+/, '/')}".sub(/\/+\z/, '')
     end
 
     # Gets API key (with prefix if set).

samples/openapi3/client/petstore/ruby/lib/petstore/api/another_fake_api.rb

@@ -10,7 +10,6 @@
 
 =end
 
-require 'uri'
 require 'cgi'
 
 module Petstore

samples/openapi3/client/petstore/ruby/lib/petstore/api/default_api.rb

@@ -10,7 +10,6 @@
 
 =end
 
-require 'uri'
 require 'cgi'
 
 module Petstore

samples/openapi3/client/petstore/ruby/lib/petstore/api/fake_api.rb

@@ -10,7 +10,6 @@
 
 =end
 
-require 'uri'
 require 'cgi'
 
 module Petstore

samples/openapi3/client/petstore/ruby/lib/petstore/api/fake_classname_tags123_api.rb

@@ -10,7 +10,6 @@
 
 =end
 
-require 'uri'
 require 'cgi'
 
 module Petstore

samples/openapi3/client/petstore/ruby/lib/petstore/api/pet_api.rb

@@ -10,7 +10,6 @@
 
 =end
 
-require 'uri'
 require 'cgi'
 
 module Petstore

samples/openapi3/client/petstore/ruby/lib/petstore/api/store_api.rb

@@ -10,7 +10,6 @@
 
 =end
 
-require 'uri'
 require 'cgi'
 
 module Petstore

samples/openapi3/client/petstore/ruby/lib/petstore/api/user_api.rb

@@ -10,7 +10,6 @@
 
 =end
 
-require 'uri'
 require 'cgi'
 
 module Petstore

samples/openapi3/client/petstore/ruby/lib/petstore/api_client.rb

@@ -15,7 +15,6 @@
 require 'logger'
 require 'tempfile'
 require 'typhoeus'
-require 'uri'
 
 module Petstore
   class ApiClient
@@ -262,7 +261,7 @@ def sanitize_filename(filename)
     def build_request_url(path)
       # Add leading and trailing slashes to path
       path = "/#{path}".gsub(/\/+/, '/')
-      URI.encode(@config.base_url + path)
+      @config.base_url + path
     end
 
     # Builds the HTTP request body

samples/openapi3/client/petstore/ruby/lib/petstore/configuration.rb

@@ -10,8 +10,6 @@
 
 =end
 
-require 'uri'
-
 module Petstore
   class Configuration
     # Defines url scheme
@@ -174,8 +172,7 @@ def base_path=(base_path)
     end
 
     def base_url
-      url = "#{scheme}://#{[host, base_path].join('/').gsub(/\/+/, '/')}".sub(/\/+\z/, '')
-      URI.encode(url)
+      "#{scheme}://#{[host, base_path].join('/').gsub(/\/+/, '/')}".sub(/\/+\z/, '')
     end
 
     # Gets API key (with prefix if set).