README
¶
Captchas
Base64 Captchas Manager, supports multiple drivers and stores.
Drivers
Stores
- Memory Store
- Redis Store
- Memcached Store
- MySQL Store
- SQLite3 Store
- PostgreSQL Store
- Add your store here by PR or request a new store.
Usage
Preview: https://captcha.clevergo.tech/.
$ cd example
$ go run main.go
Quick Start
$ go get clevergo.tech/captchas \
clevergo.tech/captchas/drivers \
clevergo.tech/captchas/stores/memstore
package main
import (
"encoding/json"
"fmt"
"io"
"log"
"net/http"
"text/template"
"clevergo.tech/captchas"
"clevergo.tech/captchas/drivers"
"clevergo.tech/captchas/stores/memstore"
)
var (
store = memstore.New() // memory store.
driver = drivers.NewDigit() // digit driver.
manager = captchas.New(store, driver) // manager
tmpl = template.Must(template.New("captcha").Parse(`
<html>
<body>
<form action="/validate" method="POST">
<input name="captcha">
{{ .captcha.HTMLField "captcha_id" }}
<input type="submit" value="Submit">
</form>
</body>
</html>
`))
)
func main() {
http.HandleFunc("/generate", generate)
http.HandleFunc("/validate", validate)
log.Println(http.ListenAndServe(":8080", http.DefaultServeMux))
}
// generates a new captcha
func generate(w http.ResponseWriter, r *http.Request) {
captcha, err := manager.Generate(r.Context())
if err != nil {
http.Error(w, err.Error(), 500)
return
}
// returns JSON data.
if r.URL.Query().Get("format") == "json" {
v := map[string]string{
"captcha_id": captcha.ID(), // captcha ID.
"captcha_data": captcha.EncodeToString(), // base64 encode string.
}
data, _ := json.Marshal(v)
w.Write(data)
return
}
// render captcha via template.
tmpl.Execute(w, map[string]interface{}{
"captcha": captcha,
})
}
// validates a captcha.
func validate(w http.ResponseWriter, r *http.Request) {
captchaID := r.PostFormValue("captcha_id")
captcha := r.PostFormValue("captcha")
// verify
if err := manager.Verify(r.Context(), captchaID, captcha, true); err != nil {
io.WriteString(w, fmt.Sprintf("captcha is invalid: %s", err.Error()))
return
}
io.WriteString(w, "valid")
}
Documentation
¶
Index ¶
Constants ¶
This section is empty.
Variables ¶
View Source
var ( ErrCaptchaIncorrect = errors.New("captcha is incorrect") ErrCaptchaExpired = errors.New("captcha is expired") )
Errors
Functions ¶
This section is empty.
Types ¶
type Captcha ¶
type Captcha interface {
// ID returns captcha ID.
ID() string
// Answer returns captcha answer.
Answer() string
// EncodeToString returns encoded base64 string.
EncodeToString() string
// HTMLField returns a template.HTML that includes captcha ID hidden input field
// and media field(audio/img).
HTMLField(fieldName string) template.HTML
}
Captcha is an interface that captchas that generated by driver should implements.
type Driver ¶
type Driver interface {
// Generate generates a new captcha, returns an error if failed.
Generate() (Captcha, error)
}
Driver defines how to generate captchas.
type Manager ¶
type Manager struct {
// contains filtered or unexported fields
}
Manager is a captchas manager.
func (*Manager) Generate ¶
Generate generates a new captcha and save it to store, returns an error if failed.
type Option ¶
type Option func(*Manager)
Option is a function that receives a pointer of manager.
func CaseSensitive ¶
CaseSensitive is an option that enable or disable case sensitive.
type Store ¶
type Store interface {
// Get returns the answer of the given captcha ID, returns
// an error if failed. Clear indicates whether delete the
// captcha after fetching.
Get(ctx context.Context, id string, clear bool) (string, error)
// Set saves the captcha ID and answer, returns error
// if failed.
Set(ctx context.Context, id, answer string) error
}
Store defines how to save and load captcha information.
Source Files
Directories
¶
| Path | Synopsis |
|---|---|
|
drivers
module
|
|
|
stores
|
|
|
dbstore
module
|
|
|
memcachedstore
module
|
|
|
memstore
module
|
|
|
mysqlstore
module
|
|
|
postgresstore
module
|
|
|
redisstore
module
|
|
|
sqlite3store
module
|
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