func PartsFromHeader(h *lob.Header) (Parts, error) {
if h.IsZero() {
return nil, nil
}
y := make(Parts, len(h.Extra))
for k, v := range h.Extra {
if len(k) != 2 {
return nil, ErrInvalidParts
}
s, ok := v.(string)
if !ok || s == "" {
return nil, ErrInvalidParts
}
csid, err := hex.DecodeString(k)
if err != nil {
return nil, ErrInvalidParts
}
if len(s) != 52 {
return nil, ErrInvalidParts
}
y[csid[0]] = s
}
return y, nil
}
func (k Keys) ApplyToHeader(h *lob.Header) {
for csid, v := range k {
h.Set(hex.EncodeToString([]byte{csid}), v.String())
}
}
func (p Parts) ApplyToHeader(h *lob.Header) {
for k, v := range p {
h.Set(hex.EncodeToString([]byte{k}), v)
}
}