72 lines
1.1 KiB
Go
72 lines
1.1 KiB
Go
package captcha
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import (
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"crypto/rand"
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"errors"
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"image"
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"math/big"
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"time"
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)
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const (
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maxAnswer = 999999
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)
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var errorNotFound = errors.New("captcha not found")
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type Answer string
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type ICaptcha interface {
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generateImage() *image.Image
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GetImage() *image.Image
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GetAnswer() Answer
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Solve(answer Answer) bool
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IsSolved() bool
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Expiry() time.Time
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}
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type Captcha struct {
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Image image.Image
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Answer Answer
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Solved bool
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ExpireIn time.Time
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}
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func (c *Captcha) generateImage() *image.Image {
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return nil
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}
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func (c *Captcha) GetImage() *image.Image {
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if c.Image == nil {
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return c.generateImage()
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}
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return &c.Image
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}
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func (c *Captcha) Solve(answer Answer) bool {
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c.Solved = c.Answer == answer
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return c.Solved
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}
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func (c *Captcha) GetAnswer() Answer {
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return c.Answer
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}
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func (c *Captcha) IsSolved() bool {
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return c.Solved
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}
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func (c *Captcha) Expiry() time.Time {
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return c.ExpireIn
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}
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func GenerateAnswer() Answer {
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ans, _ := rand.Int(rand.Reader, big.NewInt(maxAnswer))
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return (Answer(ans.String()))
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}
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func ExpiryDate(expiry time.Duration) time.Time {
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return time.Now().Add(expiry)
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}
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