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|
package objects
import (
"encoding/hex"
"fmt"
"net/url"
"sort"
)
// Properties are mappings from strings to strings that are encoded as a restricted version of URL query strings
// (only the characters [a-zA-Z0-9.:_-] are allowed, values are ordered by their key.
// This ordering and this character restrictions guarantee reproducible serialization)
type Properties map[string]string
// escapePropertyString escapes all bytes not in [a-zA-Z0-9.,:_-] as %XX, where XX represents the hexadecimal value of the byte.
// Compatible with URL query strings
func escapePropertyString(s string) []byte {
out := []byte{}
esc := []byte("%XX")
for _, b := range []byte(s) {
if (b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z') || (b >= '0' && b <= '9') || b == '.' || b == ',' || b == ':' || b == '_' || b == '-' {
out = append(out, b)
} else {
hex.Encode(esc[1:], []byte{b})
out = append(out, esc...)
}
}
return out
}
func (p Properties) MarshalText() ([]byte, error) { // Guaranteed to not fail, error is only here to satisfy encoding.TextMarshaler
keys := make([]string, len(p))
i := 0
for k := range p {
keys[i] = k
i++
}
sort.Strings(keys)
out := []byte{}
first := true
for _, k := range keys {
if first {
first = false
} else {
out = append(out, '&')
}
out = append(out, escapePropertyString(k)...)
out = append(out, '=')
out = append(out, escapePropertyString(p[k])...)
}
return out, nil
}
func (p Properties) UnmarshalText(text []byte) error {
vals, err := url.ParseQuery(string(text))
if err != nil {
return err
}
for k, v := range vals {
if len(v) != 1 {
return fmt.Errorf("Got %d values for key %s, expected 1", len(v), k)
}
p[k] = v[0]
}
return nil
}
func (a Properties) Equals(b Properties) bool {
for k, va := range a {
vb, ok := b[k]
if !ok || vb != va {
return false
}
}
for k := range b {
_, ok := a[k]
if !ok {
return false
}
}
return true
}
|
