// perform strict type conversion using reflection.
	var rawPolicy struct {
		Expiration string        `json:"expiration"`
		Conditions []interface{} `json:"conditions"`
	}

	d.DisallowUnknownFields()
	if err := d.Decode(&rawPolicy); err != nil {
		return PostPolicyForm{}, err
	}

	parsedPolicy := PostPolicyForm{}

	// Parse expiry time.

pkg encoding/csv, type ParseError struct, StartLine int
pkg encoding/hex, func NewDecoder(io.Reader) io.Reader
pkg encoding/hex, func NewEncoder(io.Writer) io.Writer
pkg encoding/json, method (*Decoder) DisallowUnknownFields()
pkg encoding/xml, func NewTokenDecoder(TokenReader) *Decoder
pkg encoding/xml, type TokenReader interface { Token }
pkg encoding/xml, type TokenReader interface, Token() (Token, error)