func normalize(call *Call, info *data.BookMetaData) {
var isbn isbn13.ISBN13
var err error
if isbn, err = isbn13.New(info.ISBN); err == nil {
var base *data.BookMetaData
if base, err = persistence.LookupISBN(call.Context, call.DetermineCountry(), isbn); err == nil {
info.Volume.Images = base.Volume.Images
return
} else {
info.Volume.Images = data.ImageLinks{}
}
} else {
call.Context.Errorf("Could not normalize data for %s: %s", info.ISBN, err.Error())
}
}
func serveVolumeSingle(call *Call) (interface{}, error) {
isbn, err := isbn13.New(call.Request.URL.Path[9:])
var book *data.BookMetaData
if err == nil {
switch call.Request.Method {
case "GET":
book, err = compositeISBNLookup(call.Context, call.DetermineCountry(), isbn)
case "PUT":
book, err = putVolumeSingle(call, isbn)
case "DELETE":
book, err = deleteVolumeSingle(call, isbn)
default:
call.StatusCode = http.StatusMethodNotAllowed
call.Response.Header().Add("Allow", "GET, PUT, DELETE")
err = errors.New("Unsupported operation. Only GET, PUT and DELETE methods are allowed")
}
} else {
call.StatusCode = http.StatusNotFound
}
return book, err
}