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|
package pencode
import (
"fmt"
"sort"
"strings"
)
var availableEncoders = map[string]Encoder{
"b64encode": Base64Encoder{},
"b64decode": Base64Decoder{},
"filename.tmpl": Template{},
"hexencode": HexEncoder{},
"hexdecode": HexDecoder{},
"htmlescape": HTMLEscaper{},
"htmlunescape": HTMLUnescaper{},
"jsonescape": JSONEscaper{},
"jsonunescape": JSONUnescaper{},
"lower": StrToLower{},
"md5": MD5Hasher{},
"sha1": SHA1Hasher{},
"sha224": SHA224Hasher{},
"sha256": SHA256Hasher{},
"sha384": SHA384Hasher{},
"sha512": SHA512Hasher{},
"unicodedecode": UnicodeDecode{},
"unicodeencodeall": UnicodeEncodeAll{},
"upper": StrToUpper{},
"urlencode": URLEncoder{},
"urldecode": URLDecoder{},
"urlencodeall": URLEncoderAll{},
"utf16": UTF16LEEncode{},
"utf16be": UTF16BEEncode{},
"xmlescape": XMLEscaper{},
"xmlunescape": XMLUnescaper{},
}
type Chain struct {
Encoders []Encoder
initialized bool
actions []string
}
func NewChain() *Chain {
c := Chain{initialized: false}
return &c
}
// Initialize loops through requested names for encoders and sets up the encoder chain. If an unknown encoder is
// requested, error will be returned.
func (c *Chain) Initialize(actions []string) error {
c.actions = actions
c.Encoders = make([]Encoder, 0)
for _, a := range actions {
if ok, err := c.HasEncoder(a); ok {
// Templates are a bit special
if isTemplate(a) {
tenc, err := NewTemplateEncoder(a)
if err != nil {
return err
}
c.Encoders = append(c.Encoders, tenc)
} else {
c.Encoders = append(c.Encoders, availableEncoders[a])
}
} else if err != nil {
return err
} else {
return fmt.Errorf("Encoder %s requested but not found.\n", a)
}
}
c.initialized = true
return nil
}
func (c *Chain) Encode(input []byte) ([]byte, error) {
var err error
if !c.initialized {
return []byte{}, fmt.Errorf("Encoder chain not initialized.\n")
}
for _, e := range c.Encoders {
input, err = e.Encode(input)
if err != nil {
return []byte{}, err
}
}
return input, nil
}
// HasEncoder returns true if encoder with a specified name is configured
func (c *Chain) HasEncoder(name string) (bool, error) {
if _, ok := availableEncoders[name]; ok {
return true, nil
}
// Check for template
if isTemplate(name) {
return hasTemplate(name)
}
return false, nil
}
func (c *Chain) GetEncoders() []string {
// Sort the encoders alphabetically
names := make([]string, 0, len(availableEncoders))
for e := range availableEncoders {
names = append(names, e)
}
sort.Strings(names)
return names
}
// Usage prints the help string for each configured encoder
func (c *Chain) Usage() {
// Calculate maximum keyword length for nice help formatting
max_length := 0
for k := range availableEncoders {
if len(k) > max_length {
max_length = len(k)
}
}
format := fmt.Sprintf(" %%-%ds- %%s\n", max_length+2)
//names := c.GetEncoders()
for _, t := range []string{"encoders", "decoders", "hashes", "other"} {
fmt.Printf("%s\n", strings.ToUpper(t))
list := []string{}
for n, e := range availableEncoders {
if e.Type() == t {
list = append(list, fmt.Sprintf(format, n, e.HelpText()))
}
}
sort.Strings(list)
for _, i := range list {
fmt.Print(i)
}
fmt.Println()
}
}
|
