37 lines
825 B
Go
37 lines
825 B
Go
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package oauth1
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import (
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"bytes"
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"fmt"
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)
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// PercentEncode percent encodes a string according to RFC 3986 2.1.
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func PercentEncode(input string) string {
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var buf bytes.Buffer
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for _, b := range []byte(input) {
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// if in unreserved set
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if shouldEscape(b) {
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buf.Write([]byte(fmt.Sprintf("%%%02X", b)))
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} else {
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// do not escape, write byte as-is
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buf.WriteByte(b)
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}
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}
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return buf.String()
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}
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// shouldEscape returns false if the byte is an unreserved character that
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// should not be escaped and true otherwise, according to RFC 3986 2.1.
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func shouldEscape(c byte) bool {
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// RFC3986 2.3 unreserved characters
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if 'A' <= c && c <= 'Z' || 'a' <= c && c <= 'z' || '0' <= c && c <= '9' {
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return false
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}
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switch c {
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case '-', '.', '_', '~':
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return false
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}
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// all other bytes must be escaped
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return true
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}
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