Created
February 23, 2019 12:10
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Golang JWT token verification with jose-jwt
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| package main | |
| import ( | |
| "crypto/x509" | |
| "encoding/pem" | |
| "errors" | |
| "fmt" | |
| "io/ioutil" | |
| "log" | |
| "os" | |
| "gopkg.in/square/go-jose.v2" | |
| "gopkg.in/square/go-jose.v2/jwt" | |
| ) | |
| func main() { | |
| tokenString, err := ioutil.ReadFile("accesstoken.txt") | |
| if err != nil { | |
| fmt.Fprintf(os.Stderr, "Error opening accesstoken.txt\n") | |
| } | |
| certBuffer, err := ioutil.ReadFile("cert.pem") | |
| if err != nil { | |
| fmt.Fprintf(os.Stderr, "Error opening cert.pem\n") | |
| } | |
| publicKey, err := LoadPublicKey(certBuffer) | |
| if err != nil { | |
| log.Fatalf("failed to load PEM :%+v", err) | |
| } | |
| parsed, err := jwt.ParseSigned(string(tokenString)) | |
| if err != nil { | |
| log.Fatalf("failed to parse JWT:%+v", err) | |
| } | |
| allClaims := make(map[string]interface{}) | |
| err = parsed.Claims(publicKey, &allClaims) | |
| if err != nil { | |
| log.Fatalf("Failed to get claims JWT: %+v", err) | |
| } | |
| fmt.Print(allClaims["exp"]) | |
| } | |
| // LoadPublicKey is a function from jose-util | |
| func LoadPublicKey(data []byte) (interface{}, error) { | |
| input := data | |
| block, _ := pem.Decode(data) | |
| if block != nil { | |
| input = block.Bytes | |
| } | |
| // Try to load SubjectPublicKeyInfo | |
| pub, err0 := x509.ParsePKIXPublicKey(input) | |
| if err0 == nil { | |
| return pub, nil | |
| } | |
| cert, err1 := x509.ParseCertificate(input) | |
| if err1 == nil { | |
| return cert.PublicKey, nil | |
| } | |
| jwk, err2 := LoadJSONWebKey(data, true) | |
| if err2 == nil { | |
| return jwk, nil | |
| } | |
| return nil, fmt.Errorf("square/go-jose: parse error, got '%s', '%s' and '%s'", err0, err1, err2) | |
| } | |
| // LoadJSONWebKey is another function from jose-util | |
| func LoadJSONWebKey(json []byte, pub bool) (*jose.JSONWebKey, error) { | |
| var jwk jose.JSONWebKey | |
| err := jwk.UnmarshalJSON(json) | |
| if err != nil { | |
| return nil, err | |
| } | |
| if !jwk.Valid() { | |
| return nil, errors.New("invalid JWK key") | |
| } | |
| if jwk.IsPublic() != pub { | |
| return nil, errors.New("priv/pub JWK key mismatch") | |
| } | |
| return &jwk, nil | |
| } |
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