Add string ops (#29)

README.md

@@ -49,6 +49,8 @@ HASHES
 
 OTHER
   filename.tmpl     - Replaces string #PAYLOAD# in content of a file that has .tmpl extension.
+  lower             - Convert string to lowercase
+  upper             - Convert string to uppercase
 
 ```
 

pkg/pencode/encoders.go

@@ -14,6 +14,7 @@ var availableEncoders = map[string]Encoder{
 	"hexdecode":        HexDecoder{},
 	"jsonescape":       JSONEscaper{},
 	"jsonunescape":     JSONUnescaper{},
+	"lower":            StrToLower{},
 	"md5":              MD5Hasher{},
 	"sha1":             SHA1Hasher{},
 	"sha224":           SHA224Hasher{},
@@ -22,6 +23,7 @@ var availableEncoders = map[string]Encoder{
 	"sha512":           SHA512Hasher{},
 	"unicodedecode":    UnicodeDecode{},
 	"unicodeencodeall": UnicodeEncodeAll{},
+	"upper":            StrToUpper{},
 	"urlencode":        URLEncoder{},
 	"urldecode":        URLDecoder{},
 	"urlencodeall":     URLEncoderAll{},

pkg/pencode/strings.go

@@ -0,0 +1,32 @@
+package pencode
+
+import (
+	"strings"
+)
+
+type StrToUpper struct{}
+type StrToLower struct{}
+
+func (s StrToUpper) Encode(input []byte) ([]byte, error) {
+	return []byte(strings.ToUpper(string(input))), nil
+}
+
+func (s StrToUpper) HelpText() string {
+	return "Convert string to uppercase"
+}
+
+func (s StrToUpper) Type() string {
+	return "other"
+}
+
+func (s StrToLower) Encode(input []byte) ([]byte, error) {
+	return []byte(strings.ToLower(string(input))), nil
+}
+
+func (s StrToLower) HelpText() string {
+	return "Convert string to lowercase"
+}
+
+func (s StrToLower) Type() string {
+	return "other"
+}