Init project

.gitignore

@@ -0,0 +1,2 @@
+.idea
+build/

Makefile

@@ -0,0 +1,44 @@
+BINARY_DEFAULT="build/myurls.service"
+BINARY_LINUX="build/linux-amd64-myurls.service"
+BINARY_DARWIN="build/darwin-amd64-myurls.service"
+BINARY_WINDOWS="build/windows-amd64-myurls.service"
+
+GOFILES="main.go"
+VERSION=1.0.0
+BUILD=`date +%FT%T%z`
+
+default:
+	@echo ${BINARY_DEFAULT}
+	@go build -o ${BINARY_DEFAULT} ${GOFILES}
+
+all:
+	@echo ${BINARY_LINUX}
+	@CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o ${BINARY_LINUX} ${GOFILES}
+	@echo ${BINARY_DARWIN}
+	@CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build -o ${BINARY_DARWIN} ${GOFILES}
+	@echo ${BINARY_WINDOWS}
+	@CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -o ${BINARY_WINDOWS} ${GOFILES}
+
+linux:
+	@echo ${BINARY_LINUX}
+	@CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o ${BINARY_LINUX} ${GOFILES}
+
+darwin:
+	@echo ${BINARY_DARWIN}
+	@CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build -o ${BINARY_DARWIN} ${GOFILES}
+
+windows:
+	@echo ${BINARY_WINDOWS}
+	@CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -o ${BINARY_WINDOWS} ${GOFILES}
+
+install:
+	@go mod tidy
+
+fmt:
+	@go fmt ./...
+
+clean:
+	@if [ -f ${BINARY_DEFAULT} ] ; then rm ${BINARY_DEFAULT} ; fi
+	@if [ -f ${BINARY_LINUX} ] ; then rm ${BINARY_LINUX} ; fi
+	@if [ -f ${BINARY_DARWIN} ] ; then rm ${BINARY_DARWIN} ; fi
+	@if [ -f ${BINARY_WINDOWS} ] ; then rm ${BINARY_WINDOWS} ; fi

README.md

@@ -0,0 +1,87 @@
+# bitly
+
+基于 golang1.13 与 Redis 实现的本地短链接服务，用于缩短请求链接与短链接还原。
+
+## Table of Contents
+
+- [Update](#update)
+- [Dependencies](#dependencies)
+- [Docker](#Docker)
+- [Install](#install)
+- [Usage](#usage)
+- [API](#api)
+- [Maintainers](#maintainers)
+- [Contributing](#contributing)
+- [License](#license)
+
+# Dependencies
+
+本服务依赖于 Redis 提供长短链接映射关系存储，你需要本地安装 Redis 服务来保证短链接服务的正常运行。
+
+```shell script
+sudo apt-get update
+
+# 安装Redis
+sudo add-apt-repository ppa:chris-lea/redis-server -y 
+sudo apt-get update 
+sudo apt-get install redis-server -y 
+```
+
+## Docker 
+
+TODO
+
+## Install
+
+安装项目依赖
+
+```shell script
+make install
+```
+
+生成可执行文件，目录位于 build/ 。默认当前平台，其他平台请参照 Makefile 或执行对应 go build 命令。
+
+```shell script
+make
+```
+
+## Usage
+
+前往 [Release](https://github.com/CareyWang/MyUrls/releases) 下载对应平台可执行文件。
+
+```shell script
+./build/myurls -h 
+
+Usage of ./build/myurls.service:
+  -domain string
+        短链接域名 (default "s.wcc.best")
+  -port int
+        服务端口 (default 8002)
+  -ttl int
+        短链接有效期，单位(天)，默认90天。 (default 90)
+```
+
+建议配合 [pm2](https://pm2.keymetrics.io/) 开启守护进程。
+
+```shell script
+pm2 start myurls.service --watch --name myurls -- -domain example.com
+```
+
+## API
+
+[参考文档](https://myurls.mydoc.li)
+
+
+## Maintainers
+
+[@CareyWang](https://github.com/CareyWang)
+
+## Contributing
+
+PRs accepted.
+
+Small note: If editing the README, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
+
+## License
+
+MIT © 2020 CareyWang

go.mod

@@ -0,0 +1,12 @@
+module github.com/CareyWang/MyUrls
+
+go 1.13
+
+require (
+	github.com/gin-gonic/gin v1.5.0
+	github.com/gomodule/redigo v2.0.0+incompatible
+	github.com/kr/pretty v0.1.0 // indirect
+	golang.org/x/sys v0.0.0-20191010194322-b09406accb47 // indirect
+	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
+	gopkg.in/yaml.v2 v2.2.4 // indirect
+)

go.sum

@@ -0,0 +1,57 @@
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main.go

@@ -0,0 +1,129 @@
+package main
+
+import (
+	"encoding/base64"
+	"flag"
+	"fmt"
+	"github.com/gin-gonic/gin"
+	"github.com/gomodule/redigo/redis"
+	"math/rand"
+	"net/http"
+)
+
+type Response struct {
+	Code     int
+	Message  string
+	LongUrl  string
+	ShortUrl string
+}
+
+const letterBytes = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+
+const defaultPort int = 8002
+const defaultDomain = "s.wcc.best"
+const defaultExpire = 90
+const redisConfig = "127.0.0.1:6379"
+
+func main() {
+	gin.SetMode(gin.ReleaseMode)
+	router := gin.Default()
+
+	port := flag.Int("port", defaultPort, "服务端口")
+	domain := flag.String("domain", defaultDomain, "短链接域名")
+	ttl := flag.Int("ttl", defaultExpire, "短链接有效期，单位(天)，默认90天。")
+	flag.Parse()
+
+	router.POST("/short", func(context *gin.Context) {
+		res := &Response{
+			Code:     1,
+			Message:  "",
+			LongUrl:  "",
+			ShortUrl: "",
+		}
+
+		longUrl := context.Query("longUrl")
+		_longUrl, _ := base64.StdEncoding.DecodeString(longUrl)
+		longUrl = string(_longUrl)
+
+		shortKey := longToShort(longUrl, *ttl * 24 * 3600)
+		if shortKey == "" {
+			res.Code = 0
+			res.Message = "短链接生成失败"
+			context.JSON(500, *res)
+			return
+		}
+
+		res.LongUrl = longUrl
+		res.ShortUrl = "http://" + *domain + "/" + shortKey
+		context.JSON(200, *res)
+	})
+
+	router.GET("/:shortKey", func(context *gin.Context) {
+		shortKey := context.Param("shortKey")
+		longUrl := shortToLong(shortKey)
+
+		if longUrl == "" {
+			context.String(http.StatusNotFound, "短链接不存在或已过期")
+		} else {
+			context.Redirect(http.StatusMovedPermanently, longUrl)
+		}
+	})
+
+	router.Run(fmt.Sprintf(":%d", *port))
+}
+
+// 短链接转长链接
+func shortToLong(shortKey string) string {
+	redisClient := initRedis()
+
+	longUrl, _ := redis.String(redisClient.Do("get", shortKey))
+	return longUrl
+}
+
+// 长链接转短链接
+func longToShort(longUrl string, ttl int) string {
+	redisClient := initRedis()
+
+	// 是否生成过该长链接对应短链接
+	_existsKey, _ := redis.String(redisClient.Do("get", longUrl))
+	if _existsKey != "" {
+		_, _ = redisClient.Do("expire", _existsKey, ttl)
+
+		return _existsKey
+	}
+
+	// 重试三次
+	var shortKey string
+	for i := 0; i < 3; i++ {
+		shortKey = generate(6)
+
+		_existsLongUrl, _ := redis.String(redisClient.Do("get", longUrl))
+		if _existsLongUrl != "" {
+			break
+		}
+	}
+
+	if shortKey != "" {
+		_, _ = redisClient.Do("mset", shortKey, longUrl, longUrl, shortKey)
+
+		_, _ = redisClient.Do("expire", shortKey, ttl)
+		_, _ = redisClient.Do("expire", longUrl, ttl)
+	}
+
+	return shortKey
+}
+
+// 产生一个63位随机整数，除以字符数取余获取对应字符
+func generate(bits int) string {
+	b := make([]byte, bits)
+	for i := range b {
+		b[i] = letterBytes[rand.Int63()%int64(len(letterBytes))]
+	}
+	return string(b)
+}
+
+func initRedis() redis.Conn {
+	client, _ := redis.Dial("tcp", redisConfig)
+
+	return client
+}