75 lines
1.8 KiB
Go
75 lines
1.8 KiB
Go
package nomino
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import (
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"crypto"
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"encoding/hex"
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"errors"
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"hash"
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"github.com/gosimple/slug"
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)
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// ErrMissingOriginal is the error returned by Slug if there is no filename.
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var ErrMissingOriginal = errors.New("missing original filename")
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func getOriginal(c *Config) (string, error) {
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if c.original == "" {
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return "", ErrMissingOriginal
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}
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name := c.original
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c.original = ""
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return name, nil
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}
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// Slug generates a name from the original filename.
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// When this is used, the original filename will be removed from the final filename.
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// If a language is specified, that may affect the resulting slug.
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func Slug(lang ...string) Generator {
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ret := slug.Make
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if len(lang) > 0 {
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ret = func(in string) string {
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return slug.MakeLang(in, lang[0])
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}
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}
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return func(c *Config) (string, error) {
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name, err := getOriginal(c)
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return ret(name), err
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}
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}
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// HashingFunc is a function that generates a hash.Hash.
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type HashingFunc func() hash.Hash
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// New allows HashingFunc to be used as a Hasher.
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func (hf HashingFunc) New() hash.Hash {
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return hf()
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}
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// Hasher is a type returns a hash.Hash.
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// All crypto.Hash may be used.
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type Hasher interface {
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New() hash.Hash
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}
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// ErrInvalidHash is returned by the Hash generator when an invalid HashType is passed.
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var ErrInvalidHash = errors.New("invalid hash type")
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// Hash generates a name from a hash of the filename.
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// When this is used, the original filename will be removed from the final filename.
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func Hash(h Hasher) Generator {
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if h == nil {
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h = crypto.MD5
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}
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return func(c *Config) (string, error) {
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if h == crypto.MD5SHA1 {
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return "", ErrInvalidHash
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}
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name, err := getOriginal(c)
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if err != nil {
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return "", err
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}
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hs := h.New()
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hs.Write([]byte(name))
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return hex.EncodeToString(hs.Sum(nil)), nil
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}
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}
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