mndrix / amazon_api Goto Github PK

Amazon's API can return error responses. A piece of the parsed XML response looks like this:

element('Errors',
                      [],
                      [ element('Error',
                        [],
                        [ element('Code',
                              [],
                              [ 'AWS.ECommerceService.ItemNotAccessible'
                              ]),
                          element('Message',
                              [],
                              [ 'This item is not accessible through the Product Advertising API.'
                              ])
                        ])
                      ])
                ])

Make a convenient predicate for iterating errors (with code and message) and a semidet predicate for determining whether the response contains an error.

That version changed the way that uri_encoded/3 works. It now correctly escapes %. Our sign_request predicate has some code that assumes % will not be escaped. They're now being double-escaped which causes Amazon to fail the API request.

We'll probably have to construct our URL with format/3 rather than using quasiquotations in this case.