├── jwt_client ├── go.mod ├── go.sum └── main.go ├── api_gateway ├── go.mod ├── go.sum └── main.go ├── .github └── CODEOWNERS ├── README.md └── LICENSE /jwt_client/go.mod: -------------------------------------------------------------------------------- 1 | module jwt_client 2 | 3 | go 1.15 4 | 5 | require github.com/dgrijalva/jwt-go v3.2.0+incompatible 6 | -------------------------------------------------------------------------------- /api_gateway/go.mod: -------------------------------------------------------------------------------- 1 | module api_gateway 2 | 3 | go 1.15 4 | 5 | require github.com/dgrijalva/jwt-go v3.2.0+incompatible // indirect 6 | -------------------------------------------------------------------------------- /.github/CODEOWNERS: -------------------------------------------------------------------------------- 1 | # This is a managed file. Manual changes will be overwritten. 2 | # https://github.com/FusionAuth/fusionauth-public-repos/ 3 | 4 | .github/ @fusionauth/owners @fusionauth/platform 5 | -------------------------------------------------------------------------------- /api_gateway/go.sum: -------------------------------------------------------------------------------- 1 | github.com/dgrijalva/jwt-go v1.0.2 h1:KPldsxuKGsS2FPWsNeg9ZO18aCrGKujPoWXn2yo+KQM= 2 | github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumCAMpl/TFQ4/5kLM= 3 | github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ= 4 | -------------------------------------------------------------------------------- /jwt_client/go.sum: -------------------------------------------------------------------------------- 1 | github.com/dgrijalva/jwt-go v1.0.2 h1:KPldsxuKGsS2FPWsNeg9ZO18aCrGKujPoWXn2yo+KQM= 2 | github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumCAMpl/TFQ4/5kLM= 3 | github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ= 4 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # FusionAuth golang microservices example 2 | 3 | This code is an example of protecting golang microservices with JSON web tokens. 4 | 5 | Read the blog post here: https://fusionauth.io/blog/2021/02/18/securing-golang-microservice/ 6 | 7 | ## To run 8 | 9 | This assumes you already have go 1.15.8 installed and have cloned this repo. 10 | 11 | In one terminal: 12 | * cd jwt_client 13 | * go get 14 | * go run main.go 15 | 16 | In another terminal: 17 | * cd api_gateway 18 | * go get 19 | * go run main.go 20 | 21 | In yet another terminal: 22 | 23 | * curl http://localhost:8080 # to get the JWT 24 | * curl http://localhost:9001 --header 'Token: [jwt value]' # to get the secret microservice response 25 | 26 | Original code by @krissnawat 27 | -------------------------------------------------------------------------------- /jwt_client/main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "fmt" 5 | "log" 6 | "net/http" 7 | "os" 8 | "time" 9 | 10 | jwt "github.com/dgrijalva/jwt-go" 11 | ) 12 | var mySigningKey = []byte(os.Getenv("SECRET_KEY")) 13 | 14 | func GetJWT() (string, error) { 15 | token := jwt.New(jwt.SigningMethodHS256) 16 | 17 | claims := token.Claims.(jwt.MapClaims) 18 | 19 | claims["authorized"] = true 20 | claims["client"] = "Krissanawat" 21 | claims["aud"] = "billing.jwtgo.io" 22 | claims["iss"] = "jwtgo.io" 23 | claims["exp"] = time.Now().Add(time.Minute * 1).Unix() 24 | 25 | tokenString, err := token.SignedString(mySigningKey) 26 | 27 | if err != nil { 28 | fmt.Errorf("Something Went Wrong: %s", err.Error()) 29 | return "", err 30 | } 31 | 32 | return tokenString, nil 33 | } 34 | 35 | func Index(w http.ResponseWriter, r *http.Request) { 36 | validToken, err := GetJWT() 37 | fmt.Println(validToken) 38 | if err != nil { 39 | fmt.Println("Failed to generate token") 40 | } 41 | 42 | fmt.Fprintf(w, string(validToken)) 43 | } 44 | 45 | func handleRequests() { 46 | http.HandleFunc("/", Index) 47 | 48 | log.Fatal(http.ListenAndServe(":8080", nil)) 49 | } 50 | 51 | func main() { 52 | handleRequests() 53 | } -------------------------------------------------------------------------------- /api_gateway/main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "fmt" 5 | "log" 6 | "net/http" 7 | "os" 8 | 9 | "github.com/dgrijalva/jwt-go" 10 | ) 11 | 12 | var MySigningKey = []byte(os.Getenv("SECRET_KEY")) 13 | 14 | func homePage(w http.ResponseWriter, r *http.Request) { 15 | fmt.Fprintf(w, "Super Secret Information") 16 | } 17 | func isAuthorized(endpoint func(http.ResponseWriter, *http.Request)) http.Handler { 18 | return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { 19 | if r.Header["Token"] != nil { 20 | 21 | token, err := jwt.Parse(r.Header["Token"][0], func(token *jwt.Token) (interface{}, error) { 22 | if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok { 23 | return nil, fmt.Errorf(("Invalid Signing Method")) 24 | } 25 | aud := "billing.jwtgo.io" 26 | checkAudience := token.Claims.(jwt.MapClaims).VerifyAudience(aud, false) 27 | if !checkAudience { 28 | return nil, fmt.Errorf(("invalid aud")) 29 | } 30 | // verify iss claim 31 | iss := "jwtgo.io" 32 | checkIss := token.Claims.(jwt.MapClaims).VerifyIssuer(iss, false) 33 | if !checkIss { 34 | return nil, fmt.Errorf(("invalid iss")) 35 | } 36 | 37 | return MySigningKey, nil 38 | }) 39 | if err != nil { 40 | fmt.Fprintf(w, err.Error()) 41 | } 42 | 43 | if token.Valid { 44 | endpoint(w, r) 45 | } 46 | 47 | } else { 48 | fmt.Fprintf(w, "No Authorization Token provided") 49 | } 50 | }) 51 | } 52 | func handleRequests() { 53 | http.Handle("/", isAuthorized(homePage)) 54 | log.Fatal(http.ListenAndServe(":9001", nil)) 55 | } 56 | func main() { 57 | fmt.Println("server") 58 | handleRequests() 59 | } 60 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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