mirror of
https://github.com/go-gitea/gitea.git
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201 lines
4.1 KiB
Go
201 lines
4.1 KiB
Go
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/**
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* Copyright 2014 Paul Querna
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package otp
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import (
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"github.com/boombuler/barcode"
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"github.com/boombuler/barcode/qr"
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"crypto/md5"
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"crypto/sha1"
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"crypto/sha256"
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"crypto/sha512"
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"errors"
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"fmt"
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"hash"
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"image"
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"net/url"
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"strings"
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)
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// Error when attempting to convert the secret from base32 to raw bytes.
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var ErrValidateSecretInvalidBase32 = errors.New("Decoding of secret as base32 failed.")
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// The user provided passcode length was not expected.
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var ErrValidateInputInvalidLength = errors.New("Input length unexpected")
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// When generating a Key, the Issuer must be set.
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var ErrGenerateMissingIssuer = errors.New("Issuer must be set")
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// When generating a Key, the Account Name must be set.
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var ErrGenerateMissingAccountName = errors.New("AccountName must be set")
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// Key represents an TOTP or HTOP key.
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type Key struct {
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orig string
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url *url.URL
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}
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// NewKeyFromURL creates a new Key from an TOTP or HOTP url.
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//
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// The URL format is documented here:
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// https://code.google.com/p/google-authenticator/wiki/KeyUriFormat
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//
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func NewKeyFromURL(orig string) (*Key, error) {
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u, err := url.Parse(orig)
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if err != nil {
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return nil, err
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}
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return &Key{
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orig: orig,
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url: u,
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}, nil
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}
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func (k *Key) String() string {
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return k.orig
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}
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// Image returns an QR-Code image of the specified width and height,
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// suitable for use by many clients like Google-Authenricator
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// to enroll a user's TOTP/HOTP key.
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func (k *Key) Image(width int, height int) (image.Image, error) {
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b, err := qr.Encode(k.orig, qr.M, qr.Auto)
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if err != nil {
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return nil, err
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}
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b, err = barcode.Scale(b, width, height)
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if err != nil {
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return nil, err
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}
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return b, nil
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}
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// Type returns "hotp" or "totp".
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func (k *Key) Type() string {
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return k.url.Host
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}
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// Issuer returns the name of the issuing organization.
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func (k *Key) Issuer() string {
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q := k.url.Query()
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issuer := q.Get("issuer")
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if issuer != "" {
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return issuer
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}
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p := strings.TrimPrefix(k.url.Path, "/")
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i := strings.Index(p, ":")
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if i == -1 {
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return ""
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}
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return p[:i]
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}
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// AccountName returns the name of the user's account.
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func (k *Key) AccountName() string {
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p := strings.TrimPrefix(k.url.Path, "/")
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i := strings.Index(p, ":")
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if i == -1 {
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return p
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}
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return p[i+1:]
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}
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// Secret returns the opaque secret for this Key.
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func (k *Key) Secret() string {
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q := k.url.Query()
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return q.Get("secret")
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}
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// Algorithm represents the hashing function to use in the HMAC
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// operation needed for OTPs.
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type Algorithm int
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const (
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AlgorithmSHA1 Algorithm = iota
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AlgorithmSHA256
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AlgorithmSHA512
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AlgorithmMD5
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)
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func (a Algorithm) String() string {
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switch a {
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case AlgorithmSHA1:
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return "SHA1"
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case AlgorithmSHA256:
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return "SHA256"
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case AlgorithmSHA512:
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return "SHA512"
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case AlgorithmMD5:
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return "MD5"
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}
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panic("unreached")
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}
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func (a Algorithm) Hash() hash.Hash {
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switch a {
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case AlgorithmSHA1:
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return sha1.New()
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case AlgorithmSHA256:
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return sha256.New()
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case AlgorithmSHA512:
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return sha512.New()
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case AlgorithmMD5:
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return md5.New()
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}
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panic("unreached")
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}
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// Digits represents the number of digits present in the
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// user's OTP passcode. Six and Eight are the most common values.
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type Digits int
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const (
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DigitsSix Digits = 6
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DigitsEight Digits = 8
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)
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// Format converts an integer into the zero-filled size for this Digits.
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func (d Digits) Format(in int32) string {
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f := fmt.Sprintf("%%0%dd", d)
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return fmt.Sprintf(f, in)
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}
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// Length returns the number of characters for this Digits.
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func (d Digits) Length() int {
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return int(d)
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}
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func (d Digits) String() string {
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return fmt.Sprintf("%d", d)
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}
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