92 lines
2.3 KiB
Go
92 lines
2.3 KiB
Go
package model
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import (
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"crypto/md5"
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"encoding/pem"
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"fmt"
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"strings"
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"unicode"
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"code.google.com/p/go.crypto/ssh"
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"code.google.com/p/go.text/unicode/norm"
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"github.com/dchest/uniuri"
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)
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var (
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lat = []*unicode.RangeTable{unicode.Letter, unicode.Number}
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nop = []*unicode.RangeTable{unicode.Mark, unicode.Sk, unicode.Lm}
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)
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// helper function to create a Gravatar Hash
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// for the given Email address.
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func createGravatar(email string) string {
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email = strings.ToLower(strings.TrimSpace(email))
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hash := md5.New()
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hash.Write([]byte(email))
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return fmt.Sprintf("%x", hash.Sum(nil))
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}
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// helper function to create a Slug for the
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// given string of text.
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func createSlug(s string) string {
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buf := make([]rune, 0, len(s))
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dash := false
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for _, r := range norm.NFKD.String(s) {
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switch {
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// unicode 'letters' like mandarin characters pass through
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case unicode.IsOneOf(lat, r):
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buf = append(buf, unicode.ToLower(r))
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dash = true
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case unicode.IsOneOf(nop, r):
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// skip
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case dash:
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buf = append(buf, '-')
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dash = false
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}
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}
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if i := len(buf) - 1; i >= 0 && buf[i] == '-' {
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buf = buf[:i]
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}
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return string(buf)
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}
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// helper function to create a random 40-byte
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// Token that is URL-friendly.
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func createToken() string {
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return uniuri.NewLen(40)
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}
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// -----------------------------------------------------------------------------
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// SSH Functions
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const (
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RSA_BITS = 2048 // Default number of bits in an RSA key
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RSA_BITS_MIN = 768 // Minimum number of bits in an RSA key
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)
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// helper function to generate an RSA Private Key.
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func generatePrivateKey() (*rsa.PrivateKey, error) {
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return rsa.GenerateKey(rand.Reader, RSA_BITS)
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}
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// helper function that marshalls an RSA Public Key to an SSH
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// .authorized_keys format
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func marshalPublicKey(pubkey *rsa.PublicKey) string {
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pk, err := ssh.NewPublicKey(pubkey)
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if err != nil {
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return ""
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}
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return string(ssh.MarshalAuthorizedKey(pk))
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}
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// helper function that marshalls an RSA Private Key to
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// a PEM encoded file.
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func marshalPrivateKey(privkey *rsa.PrivateKey) string {
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privateKeyMarshaled := x509.MarshalPKCS1PrivateKey(privkey)
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privateKeyPEM := pem.EncodeToMemory(&pem.Block{Type: "RSA PRIVATE KEY", Headers: nil, Bytes: privateKeyMarshaled})
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return string(privateKeyPEM)
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}
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