Function ScanParameters

http/jsonapi/runtime/parameters.go:57–114

ScanParameters scans the request using the given path parameter objects in case an error is encountered a 400 along with a jsonapi errors object is sent to the ResponseWriter and false is returned. Returns true if all values were scanned successfully. The used scanning function is fmt.Sscan

(w http.ResponseWriter, r *http.Request, parameters ...*ScanParameter)

// is sent to the ResponseWriter and false is returned. Returns true if all
// values were scanned successfully. The used scanning function is fmt.Sscan
func ScanParameters(w http.ResponseWriter, r *http.Request, parameters ...*ScanParameter) bool {
	for _, param := range parameters {
		var scanData string

		switch param.Location {
		case ScanInPath:
			// input is filled with path data
			scanData = param.Input
		case ScanInQuery:
			// input may not be filled and needs to be parsed from the request
			input := r.URL.Query()[param.Name]

			// if parameter is a slice
			reValue := reflect.ValueOf(param.Data).Elem()
			if reValue.Kind() == reflect.Slice {
				size := len(input)
				array := reflect.MakeSlice(reValue.Type(), size, size)
				invalid := 0
				for i := 0; i < size; i++ {
					if input[i] == "" {
						invalid++
						continue
					}

					arrElem := array.Index(i - invalid)
					n, _ := Scan(input[i], arrElem.Addr().Interface()) // nolint: gosec
					if n != 1 {
						WriteError(w, http.StatusBadRequest, param.BuildInvalidValueError(arrElem.Type(), input[i]))
						return false
					}
				}
				// some of the query parameters where empty, filter them out
				if invalid > 0 {
					array = array.Slice(0, size-invalid)
				}
				reValue.Set(array)

				// skip parsing at the bottom of the loop
				continue
			}

			// single parameter scanning
			scanData = strings.Join(input, " ")
		case ScanInHeader:
			scanData = r.Header.Get(param.Name)
		default:
			panic(fmt.Errorf("impossible scanning location: %d", param.Location))
		}

		n, _ := Scan(scanData, param.Data)
		// only report on non empty data, govalidator will handle the other cases
		if n != 1 && scanData != "" {
			WriteError(w, http.StatusBadRequest, param.BuildInvalidValueError(reflect.ValueOf(param.Data).Type(), scanData))
			return false
		}
	}
	return true
}