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golang 原生库生成RSA密钥对，公钥和私钥保存为文件

package main

import (
	"crypto/rand"
	"crypto/rsa"
	"crypto/x509"
	"encoding/pem"
	"os"
)

func generateRSAKey(privateFile, publicFile string, bits int) error {
	// 生成 RSA 私钥对象
	privateKey, err := rsa.GenerateKey(rand.Reader, bits)
	if err != nil {
		return err
	}

	// 通过x509标准将得到的ras私钥序列化为 ASN.1 的 DER 编码字符串
	x509PrivateKey := x509.MarshalPKCS1PrivateKey(privateKey)

	// 新建私钥文件
	private, err := os.Create(privateFile)
	if err != nil {
		return err
	}
	defer private.Close()

	// 将数据保存到文件
	err = pem.Encode(private, &pem.Block{
		Type:    "RSA Private Key",
		Headers: map[string]string{},
		Bytes:   x509PrivateKey,
	})
	if err != nil {
		return err
	}

	// X509对公钥编码
	X509PublicKey, err := x509.MarshalPKIXPublicKey(&privateKey.PublicKey)
	if err != nil {
		return err
	}

	// 新建公钥文件
	public, err := os.Create(publicFile)
	if err != nil {
		return err
	}
	defer public.Close()

	// 将数据保存到文件
	err = pem.Encode(public, &pem.Block{
		Type:    "RSA Public Key",
		Headers: map[string]string{},
		Bytes:   X509PublicKey,
	})
	if err != nil {
		return err
	}

	return nil
}

func main() {
	generateRSAKey("./private.key", "./public.key", 4096)
}

1. 基础用法：

package main

import (
	"net/http"

	"github.com/gin-gonic/gin"
)

func main() {
	r := gin.Default()

	r.GET("/", func(c *gin.Context) {
		c.String(200, "Index")
	})

	r.GET("/user/:name", func(c *gin.Context) {
		name := c.Param("name")
		c.String(http.StatusOK, "Hello %s", name)
	})

	r.POST("/form", func(c *gin.Context) {
		username := c.PostForm("username")
		password := c.DefaultPostForm("password", "000000")

		c.JSON(http.StatusOK, gin.H{
			"username": username,
			"password": password,
		})
	})

	r.POST("/upload", func(c *gin.Context) {
		file, _ := c.FormFile("file")
		// c.SaveUploadedFile(file, dst)
		c.String(http.StatusOK, "%s uploaded!", file.Filename)
	})

	r.Run("0.0.0.0:8800")
}

2. 常用方法

// c.Abort() 
// c.AbortWithError(code int, err error) *Error 
// c.AbortWithStatus(code int) 
// c.AbortWithStatusJSON(code int, jsonObj interface}) 
// c.AsciiJSON(code int, obj interface}) 
// c.Bind(obj interface}) error 
// c.BindHeader(obj interface}) error 
// c.BindJSON(obj interface}) error 
// c.BindQuery(obj interface}) error 
// c.BindUri(obj interface}) error 
// c.BindXML(obj interface}) error 
// c.BindYAML(obj interface}) error 
// c.ClientIP() string 
// c.ContentType() string 
// c.Cookie(name string) (string, error) 
// c.Data(code int, contentType string, data []byte) 
// c.DataFromReader(code int, contentLength int64, contentType string, reader io.Reader, extraHeaders map[string]string) 
// c.Deadline() (deadline time.Time, ok bool) 
// c.DefaultPostForm(key, defaultValue string) string 
// c.DefaultQuery(key, defaultValue string) string 
// c.Done() <-chan struct} 
// c.Err() error 
// c.Error(err error) *Error 
// c.File(filepath string) 
// c.FileAttachment(filepath, filename string) 
// c.FileFromFS(filepath string, fs http.FileSystem) 
// c.FormFile(name string) (*multipart.FileHeader, error) 
// c.FullPath() string 
// c.func bodyAllowedForStatus(status int) bool 
// c.func validateHeader(header string) (clientIP string, valid bool) 
// c.Get(key string) (value interface}, exists bool) 
// c.get(m map[string][]string, key string) (map[string]string, bool) 
// c.GetBool(key string) (b bool) 
// c.GetDuration(key string) (d time.Duration) 
// c.GetFloat64(key string) (f64 float64) 
// c.GetHeader(key string) string 
// c.GetInt(key string) (i int) 
// c.GetInt64(key string) (i64 int64) 
// c.GetPostForm(key string) (string, bool) 
// c.GetPostFormArray(key string) ([]string, bool) 
// c.GetPostFormMap(key string) (map[string]string, bool) 
// c.GetQuery(key string) (string, bool) 
// c.GetQueryArray(key string) ([]string, bool) 
// c.GetQueryMap(key string) (map[string]string, bool) 
// c.GetRawData() ([]byte, error) 
// c.GetString(key string) (s string) 
// c.GetStringMap(key string) (sm map[string]interface}) 
// c.GetStringMapString(key string) (sms map[string]string) 
// c.GetStringMapStringSlice(key string) (smss map[string][]string) 
// c.GetStringSlice(key string) (ss []string) 
// c.GetTime(key string) (t time.Time) 
// c.GetUint(key string) (ui uint) 
// c.GetUint64(key string) (ui64 uint64) 
// c.Handler() HandlerFunc 
// c.HandlerName() string 
// c.HandlerNames() []string 
// c.Header(key, value string) 
// c.HTML(code int, name string, obj interface}) 
// c.IndentedJSON(code int, obj interface}) 
// c.initFormCache() 
// c.initQueryCache() 
// c.IsAborted() bool 
// c.IsWebsocket() bool 
// c.JSON(code int, obj interface}) 
// c.JSONP(code int, obj interface}) 
// c.MultipartForm() (*multipart.Form, error) 
// c.MustBindWith(obj interface}, b binding.Binding) error 
// c.MustGet(key string) interface} 
// c.Negotiate(code int, config Negotiate) 
// c.NegotiateFormat(offered ...string) string 
// c.Next() 
// c.Param(key string) string 
// c.PostForm(key string) string 
// c.PostFormArray(key string) []string 
// c.PostFormMap(key string) map[string]string 
// c.ProtoBuf(code int, obj interface}) 
// c.PureJSON(code int, obj interface}) 
// c.Query(key string) string 
// c.QueryArray(key string) []string 
// c.QueryMap(key string) map[string]string 
// c.Redirect(code int, location string) 
// c.RemoteIP() (net.IP, bool) 
// c.Render(code int, r render.Render) 
// c.requestHeader(key string) string 
// c.SaveUploadedFile(file *multipart.FileHeader, dst string) error 
// c.SecureJSON(code int, obj interface}) 
// c.Set(key string, value interface}) 
// c.SetAccepted(formats ...string) 
// c.SetCookie(name, value string, maxAge int, path, domain string, secure, httpOnly bool) 
// c.SetSameSite(samesite http.SameSite) 
// c.ShouldBind(obj interface}) error 
// c.ShouldBindBodyWith(obj interface}, bb binding.BindingBody) (err error) 
// c.ShouldBindHeader(obj interface}) error 
// c.ShouldBindJSON(obj interface}) error 
// c.ShouldBindQuery(obj interface}) error 
// c.ShouldBindUri(obj interface}) error 
// c.ShouldBindWith(obj interface}, b binding.Binding) error 
// c.ShouldBindXML(obj interface}) error 
// c.ShouldBindYAML(obj interface}) error 
// c.SSEvent(name string, message interface}) 
// c.Status(code int) 
// c.Stream(step func(w io.Writer) bool) bool 
// c.String(code int, format string, values ...interface}) 
// c.Value(key interface}) interface} 
// c.XML(code int, obj interface}) 
// c.YAML(code int, obj interface}) 

— 压力测试

https://github.com/rakyll/hey

— RPC 框架

https://grpc.io/

— 数据库

https://gorm.io/

https://github.com/go-sql-driver/mysql

— 网络

https://github.com/valyala/fasthttp

https://github.com/andelf/go-curl

https://github.com/dghubble/sling

— 存储

https://min.io/

— 证书

https://github.com/go-acme/lego

抓取网页内容

func getHtmlContent(u string, r string) []string {
	resp, err := http.Get(u)
	if err != nil {
		log.Println(err.Error())
		return nil
	}
	defer resp.Body.Close()

	if resp.StatusCode == http.StatusOK {
		c, err := ioutil.ReadAll(resp.Body)
		if err != nil {
			log.Println(err.Error())
			return nil
		}

		return regexp.MustCompile(`href=".*"`).FindAllString(string(c), -1)
	} else {
		log.Println("Error HTML Code: ", resp.StatusCode)
		return nil
	}
}