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// Copyright 2017 Eric Zhou. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package base64Captcha supports digits, numbers,alphabet, arithmetic, audio and digit-alphabet captcha.
// base64Captcha is used for fast development of RESTful APIs, web apps and backend services in Go. give a string identifier to the package and it returns with a base64-encoding-png-string
package base64Captcha
import (
"strings"
)
// Captcha captcha basic information.
type Captcha struct {
Driver Driver
Store Store
}
// NewCaptcha creates a captcha instance from driver and store
func NewCaptcha(driver Driver, store Store) *Captcha {
return &Captcha{Driver: driver, Store: store}
}
// Generate generates a random id, base64 image string or an error if any
func (c *Captcha) Generate() (id, b64s string, err error) {
id, content, answer := c.Driver.GenerateIdQuestionAnswer()
item, err := c.Driver.DrawCaptcha(content)
if err != nil {
return "", "", err
}
err = c.Store.Set(id, answer)
if err != nil {
return "", "", err
}
b64s = item.EncodeB64string()
return
}
// Verify by a given id key and remove the captcha value in store,
// return boolean value.
// if you has multiple captcha instances which share a same store.
// You may want to call `store.Verify` method instead.
func (c *Captcha) Verify(id, answer string, clear bool) (match bool) {
vv := c.Store.Get(id, clear)
//fix issue for some redis key-value string value
vv = strings.TrimSpace(vv)
return vv == strings.TrimSpace(answer)
}