jwt

JSON Web Tokens

Iris has its own builtin JWT middleware now which is faster and supports payload encryption, it is compatible with the new iris.User interface, it can write and read Go structs or map as token claims and many more features than the community edition one. Please navigate to kataras/iris/_examples/auth/jwt instead.

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Provides basic JWT functionality for your APIs.

Example can be found at: _example/main.go

1. Install with go get github.com/iris-contrib/middleware/jwt@master

2. Import in your code import "github.com/iris-contrib/middleware/jwt"

3. Define a HS256 secret, e.g. const mySecret = []byte("My Secret"). In production you usually load it from a local file or from system environment variables

4. Initialize the middleware:

j := jwt.New(jwt.Config{
    ValidationKeyGetter: func(token *jwt.Token) (interface{}, error) {
        return mySecret, nil
    },
    SigningMethod: jwt.SigningMethodHS256,
})

5. Generate a token:

token := jwt.NewTokenWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
    "foo": "bar",
})

tokenString, _ := token.SignedString(mySecret)

6. Verify a token with the j.Serve before the main handler, e.g.:

app.Get("/protected", j.Serve, protectedHandler)

Or per group of routes:

usersAPI := app.Party("/users", j.Serve)
usersAPI.Get(protectedHandler)

7. Get the verified claims stored in Context's key of "jwt":

func protectedHandler(ctx iris.Context) {
    // Get the Token verified in the previous handler (of `j.Serve`).
    user := ctx.Values().Get("jwt").(*jwt.Token)

    // A map type of our stored Claims on this verified Token.
	foobar := user.Claims.(jwt.MapClaims) 
	for key, value := range foobar {
		ctx.Writef("%s = %s", key, value)
	}
}

By default the token is extracted by the Authorization: Bearer $TOKEN header. To change this behavior, you can set custom TokenExtractor in the JWT middleware's configuration. A TokenExtractor looks like that:

type TokenExtractor func(iris.Context) (string, error)

The middleware package contains some builtin extractors like the FromParameter one. For example, if you want to accept a token only by a "token" URL Query Parameter do that:

j := jwt.New(jwt.Config{
    // [...other fields]
    Extractor: jwt.FromParameter("token"),
})

You can also use more token extractors by wrapping them with the FromFirst extractor, e.g. try to receive the token from the "Authorization" Header and the "token" URL Query Parameter:

j := jwt.New(jwt.Config{
    // [...other fields]
    Extractor: jwt.FromFirst(FromAuthHeader, jwt.FromParameter("token")),
})