图片验证码库(captcha)

config/captcha.go

@@ -0,0 +1,19 @@
+package config
+
+import "github.com/runningwater/gohub/pkg/config"
+
+func init() {
+	config.Add("captcha", func() map[string]any {
+		return map[string]any{
+			"height":            config.Env("CAPTCHA_HEIGHT", 80),                       // 验证码高度
+			"width":             config.Env("CAPTCHA_WIDTH", 240),                       // 验证码宽度
+			"length":            config.Env("CAPTCHA_LENGTH", 6),                        // 验证码长度
+			"maxskew":           config.Env("CAPTCHA_MAXSKEW", 0.7),                     // 最大斜角
+			"dotcount":          config.Env("CAPTCHA_DOTCOUNT", 80),                     // 图片背景里的混淆点数量
+			"expire_time":       config.Env("CAPTCHA_EXPIRE_TIME", 15),                  // 验证码过期时间，单位分钟
+			"debug_expire_time": config.Env("CAPTCHA_DEBUG_EXPIRE_TIME", 60),            // 调试模式下验证码过期时间，单位分钟
+			"testing_key":       config.Env("CAPTCHA_TESTING_KEY", "captcha_skip_test"), // 测试时跳过验证码的 key
+		}
+
+	})
+}

go.mod

@@ -5,6 +5,7 @@ go 1.24.2
 require (
 	github.com/gin-gonic/gin v1.10.0
 	github.com/go-redis/redis v6.15.9+incompatible
+	github.com/mojocn/base64Captcha v1.3.8
 	github.com/spf13/cast v1.7.1
 	github.com/spf13/viper v1.20.1
 	github.com/thedevsaddam/govalidator v1.9.10
@@ -29,6 +30,7 @@ require (
 	github.com/go-sql-driver/mysql v1.7.0 // indirect
 	github.com/go-viper/mapstructure/v2 v2.2.1 // indirect
 	github.com/goccy/go-json v0.10.2 // indirect
+	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect
 	github.com/jinzhu/inflection v1.0.0 // indirect
 	github.com/jinzhu/now v1.1.5 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
@@ -51,6 +53,7 @@ require (
 	go.uber.org/multierr v1.10.0 // indirect
 	golang.org/x/arch v0.8.0 // indirect
 	golang.org/x/crypto v0.37.0 // indirect
+	golang.org/x/image v0.23.0 // indirect
 	golang.org/x/net v0.39.0 // indirect
 	golang.org/x/sys v0.32.0 // indirect
 	golang.org/x/text v0.24.0 // indirect

go.sum

@@ -41,6 +41,8 @@ github.com/go-viper/mapstructure/v2 v2.2.1 h1:ZAaOCxANMuZx5RCeg0mBdEZk7DZasvvZIx
 github.com/go-viper/mapstructure/v2 v2.2.1/go.mod h1:oJDH3BJKyqBA2TXFhDsKDGDTlndYOZ6rGS0BRZIxGhM=
 github.com/goccy/go-json v0.10.2 h1:CrxCmQqYDkv1z7lO7Wbh2HN93uovUHgrECaO5ZrCXAU=
 github.com/goccy/go-json v0.10.2/go.mod h1:6MelG93GURQebXPDq3khkgXZkazVtN9CRI+MGFi0w8I=
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.4.0-rc.1/go.mod h1:ceaxUfeHdC40wWswd/P6IGgMaK3YpKi5j83Wpe3EHw8=
 github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:xKAWHe0F5eneWXFV3EuXVDTCmh+JuBKY0li0aMyXATA=
@@ -85,6 +87,8 @@ github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w
 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
 github.com/modern-go/reflect2 v1.0.2 h1:xBagoLtFs94CBntxluKeaWgTMpvLxC4ur3nMaC9Gz0M=
 github.com/modern-go/reflect2 v1.0.2/go.mod h1:yWuevngMOJpCy52FWWMvUC8ws7m/LJsjYzDa0/r8luk=
+github.com/mojocn/base64Captcha v1.3.8 h1:rrN9BhCwXKS8ht1e21kvR3iTaMgf4qPC9sRoV52bqEg=
+github.com/mojocn/base64Captcha v1.3.8/go.mod h1:QFZy927L8HVP3+VV5z2b1EAEiv1KxVJKZbAucVgLUy4=
 github.com/nxadm/tail v1.4.4/go.mod h1:kenIhsEOeOJmVchQTgglprH7qJGnHDVpk1VPCcaMI8A=
 github.com/nxadm/tail v1.4.8 h1:nPr65rt6Y5JFSKQO7qToXr7pePgD6Gwiw05lkbyAQTE=
 github.com/nxadm/tail v1.4.8/go.mod h1:+ncqLTQzXmGhMZNUePPaPqPvBxHAIsmXswZKocGu+AU=
@@ -137,6 +141,7 @@ github.com/twitchyliquid64/golang-asm v0.15.1/go.mod h1:a1lVb/DtPvCB8fslRZhAngC2
 github.com/ugorji/go/codec v1.2.12 h1:9LC83zGrHhuUA9l16C9AHXAqEV/2wBQ4nkvumAE65EE=
 github.com/ugorji/go/codec v1.2.12/go.mod h1:UNopzCgEMSXjBc6AOMqYvWC1ktqTAfzJZUZgYf6w6lg=
 github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
 go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
 go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
 go.uber.org/multierr v1.10.0 h1:S0h4aNzvfcFsC3dRF1jLoaov7oRaKqRGC/pUEJ2yvPQ=
@@ -149,20 +154,44 @@ golang.org/x/arch v0.8.0/go.mod h1:FEVrYAQjsQXMVJ1nsMoVVXPZg6p2JE2mx8psSWTDQys=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/crypto v0.13.0/go.mod h1:y6Z2r+Rw4iayiXXAIxJIDAJ1zMW4yaTpebo8fPOliYc=
+golang.org/x/crypto v0.19.0/go.mod h1:Iy9bg/ha4yyC70EfRS8jz+B6ybOBKMaSxLj6P6oBDfU=
+golang.org/x/crypto v0.23.0/go.mod h1:CKFgDieR+mRhux2Lsu27y0fO304Db0wZe70UKqHu0v8=
 golang.org/x/crypto v0.37.0 h1:kJNSjF/Xp7kU0iB2Z+9viTPMW4EqqsrywMXLJOOsXSE=
 golang.org/x/crypto v0.37.0/go.mod h1:vg+k43peMZ0pUMhYmVAWysMK35e6ioLh3wB8ZCAfbVc=
+golang.org/x/image v0.23.0 h1:HseQ7c2OpPKTPVzNjG5fwJsOTCiiwS4QdsYi5XU6H68=
+golang.org/x/image v0.23.0/go.mod h1:wJJBTdLfCCf3tiHa1fNxpZmUI4mmoZvwMCPP0ddoNKY=
 golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
+golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/mod v0.12.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/mod v0.15.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
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 golang.org/x/net v0.0.0-20210428140749-89ef3d95e781/go.mod h1:OJAsFXCWl8Ukc7SiCT/9KSuxbyM7479/AVlXFRxuMCk=
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 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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+golang.org/x/sync v0.6.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+golang.org/x/sync v0.7.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+golang.org/x/sync v0.10.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
 golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -175,20 +204,45 @@ golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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 golang.org/x/sys v0.0.0-20211216021012-1d35b9e2eb4e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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pkg/captcha/captcha.go

@@ -0,0 +1,66 @@
+// Package captcha 处理图片验证码逻辑，支持: 1. 生成图片验证码 2. 校验图片验证码
+// 支持的存储：redis, memory
+package captcha
+
+import (
+	"sync"
+
+	"github.com/mojocn/base64Captcha"
+	"github.com/runningwater/gohub/pkg/app"
+	"github.com/runningwater/gohub/pkg/config"
+	"github.com/runningwater/gohub/pkg/redis"
+)
+
+type Captcha struct {
+	base64Captcha *base64Captcha.Captcha
+}
+
+// 确保 internalCaptcha 只初始化一次
+// 通过 sync.Once 确保线程安全
+var one sync.Once
+
+var internalCaptcha *Captcha
+
+// NewCaptcha 创建一个新的验证码实例
+func NewCaptcha() *Captcha {
+	one.Do(func() {
+		// 初始化 Captcha 实例
+		internalCaptcha = &Captcha{}
+
+		// 使用 redis 作为存储引擎，并设置 key 的前缀
+		store := RedisStore{
+			RedisClient: redis.Redis,
+			KeyPrefix:   config.GetString("app.name") + ":captcha:",
+		}
+
+		// 配置 base64Captcha 驱动信息
+		driver := base64Captcha.NewDriverDigit(
+			config.GetInt("captcha.height"),      // 高度
+			config.GetInt("captcha.width"),       // 宽度
+			config.GetInt("captcha.length"),      // 长度
+			config.GetFloat64("captcha.maxskew"), // 最大倾斜角度
+			config.GetInt("captcha.dotcount"),    // 图片背景里的混淆点数量
+		)
+
+		// 创建 base64Captcha 实例
+		internalCaptcha.base64Captcha = base64Captcha.NewCaptcha(driver, &store)
+	})
+
+	return internalCaptcha
+}
+
+// GenerateCaptcha 生成验证码
+func (c *Captcha) GenerateCaptcha() (id, b64s, answer string, err error) {
+	return c.base64Captcha.Generate()
+}
+
+// VerifyCaptcha 校验验证码
+func (c *Captcha) VerifyCaptcha(id, answer string) (match bool) {
+	// 方便本地开发调试
+	if !app.IsProduction() && id == config.GetString("captcha.testing_key") {
+		return true
+	}
+	// 第三个参数是验证后是否删除，我们选择 false
+	// 这样方便用户多次提交，防止表单提交错误需要多次输入图片验证码
+	return c.base64Captcha.Verify(id, answer, false)
+}

pkg/captcha/store_redis.go

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+package captcha
+
+import (
+	"errors"
+	"time"
+
+	"github.com/runningwater/gohub/pkg/app"
+	"github.com/runningwater/gohub/pkg/config"
+	"github.com/runningwater/gohub/pkg/redis"
+)
+
+// RedisStore is a store for captcha using Redis.
+// It implements the Store interface. base64Captcha.Store interface.
+type RedisStore struct {
+	RedisClient *redis.RedisClient
+	KeyPrefix   string
+}
+
+// Set 实现 base64Captcha.Store.Set 方法
+func (s *RedisStore) Set(key string, value string) error {
+	expiretime := time.Minute * time.Duration(config.GetInt64("captcha.expire_time"))
+	// 方便本地开发调试
+	if app.IsLocal() {
+		expiretime = time.Minute * time.Duration(config.GetInt64("captcha.debug_expire_time"))
+	}
+	if ok := s.RedisClient.Set(s.KeyPrefix+key, value, expiretime); !ok {
+		return errors.New("无法存储图片验证码")
+	}
+
+	return nil
+}
+
+// Get 实现 base64Captcha.Store.Get 方法
+func (s *RedisStore) Get(key string, clear bool) string {
+	key = s.KeyPrefix + key
+	val := s.RedisClient.Get(key)
+	if clear {
+		s.RedisClient.Del(key)
+	}
+	return val
+}
+
+// Verify 实现 base64Captcha.Store.Verify 方法
+func (s *RedisStore) Verify(key, answer string, clear bool) bool {
+	v := s.Get(key, clear)
+	return v == answer
+}