add a jwt tutorial + go client

_examples/auth/jwt/tutorial/util/app.go

@@ -0,0 +1,7 @@
+package util
+
+// Constants for the application.
+const (
+	Version = "0.0.1"
+	AppName = "myapp"
+)

_examples/auth/jwt/tutorial/util/clock.go

@@ -0,0 +1,7 @@
+package util
+
+import "time"
+
+// Now is the default current time for the whole application.
+// Can be modified for testing or custom timezone.
+var Now = time.Now

_examples/auth/jwt/tutorial/util/password.go

@@ -0,0 +1,25 @@
+package util
+
+import "golang.org/x/crypto/bcrypt"
+
+// MustGeneratePassword same as GeneratePassword but panics on errors.
+func MustGeneratePassword(userPassword string) []byte {
+	hashed, err := GeneratePassword(userPassword)
+	if err != nil {
+		panic(err)
+	}
+
+	return hashed
+}
+
+// GeneratePassword will generate a hashed password for us based on the
+// user's input.
+func GeneratePassword(userPassword string) ([]byte, error) {
+	return bcrypt.GenerateFromPassword([]byte(userPassword), bcrypt.DefaultCost)
+}
+
+// ValidatePassword will check if passwords are matched.
+func ValidatePassword(userPassword string, hashed []byte) bool {
+	err := bcrypt.CompareHashAndPassword(hashed, []byte(userPassword))
+	return err == nil
+}

_examples/auth/jwt/tutorial/util/uuid.go

@@ -0,0 +1,23 @@
+package util
+
+import "github.com/google/uuid"
+
+// MustGenerateUUID returns a new v4 UUID or panics.
+func MustGenerateUUID() string {
+	id, err := GenerateUUID()
+	if err != nil {
+		panic(err)
+	}
+
+	return id
+}
+
+// GenerateUUID returns a new v4 UUID.
+func GenerateUUID() (string, error) {
+	id, err := uuid.NewRandom()
+	if err != nil {
+		return "", err
+	}
+
+	return id.String(), nil
+}