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encode.go
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encode.go
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// Copyright (c) 2015 Dalton Hubble. All rights reserved.
// Copyrights licensed under the MIT License.
package oauth1
import (
"bytes"
"fmt"
"strings"
)
// encodeParameterString encodes collected OAuth parameters
// into a parameter string as defined in RFC 5894 3.4.1.3.2.
func encodeParameterString(params map[string]string) string {
return strings.Join(sortParameters(
encodeParameters(params), "%s=%s"), "&")
}
// encodeParameters percent encodes parameter keys and
// values according to RFC5849 3.6 and RFC3986 2.1 and
// returns a new map.
func encodeParameters(params map[string]string) map[string]string {
encoded := map[string]string{}
for key, value := range params {
encoded[percentEncode(key)] = percentEncode(value)
}
return encoded
}
// percentEncode percent encodes a string according to
// RFC 3986 2.1.
func percentEncode(input string) string {
var buf bytes.Buffer
for _, b := range []byte(input) {
// if in unreserved set
if shouldEscape(b) {
buf.Write([]byte(fmt.Sprintf("%%%02X", b)))
} else {
// do not escape, write byte as-is
buf.WriteByte(b)
}
}
return buf.String()
}
// shouldEscape returns false if the byte is an unreserved
// character that should not be escaped and true otherwise,
// according to RFC 3986 2.1.
func shouldEscape(c byte) bool {
// RFC3986 2.3 unreserved characters
if 'A' <= c && c <= 'Z' || 'a' <= c && c <= 'z' || '0' <= c && c <= '9' {
return false
}
switch c {
case '-', '.', '_', '~':
return false
}
// all other bytes must be escaped
return true
}