forked from mirror/jwt
127 lines
3.8 KiB
Go
127 lines
3.8 KiB
Go
package jwt
|
|
|
|
import (
|
|
"encoding/base64"
|
|
"encoding/json"
|
|
"net/http"
|
|
"strings"
|
|
"time"
|
|
)
|
|
|
|
// TimeFunc provides the current time when parsing token to validate "exp" claim (expiration time).
|
|
// You can override it to use another time value. This is useful for testing or if your
|
|
// server uses a different time zone than your tokens.
|
|
var TimeFunc = time.Now
|
|
|
|
// Parse methods use this callback function to supply
|
|
// the key for verification. The function receives the parsed,
|
|
// but unverified Token. This allows you to use propries in the
|
|
// Header of the token (such as `kid`) to identify which key to use.
|
|
type Keyfunc func(*Token) (interface{}, error)
|
|
|
|
// A JWT Token. Different fields will be used depending on whether you're
|
|
// creating or parsing/verifying a token.
|
|
type Token struct {
|
|
Raw string // The raw token. Populated when you Parse a token
|
|
Method SigningMethod // The signing method used or to be used
|
|
Header map[string]interface{} // The first segment of the token
|
|
Claims map[string]interface{} // The second segment of the token
|
|
Signature string // The third segment of the token. Populated when you Parse a token
|
|
Valid bool // Is the token valid? Populated when you Parse/Verify a token
|
|
}
|
|
|
|
// Create a new Token. Takes a signing method
|
|
func New(method SigningMethod) *Token {
|
|
return &Token{
|
|
Header: map[string]interface{}{
|
|
"typ": "JWT",
|
|
"alg": method.Alg(),
|
|
},
|
|
Claims: make(map[string]interface{}),
|
|
Method: method,
|
|
}
|
|
}
|
|
|
|
// Get the complete, signed token
|
|
func (t *Token) SignedString(key interface{}) (string, error) {
|
|
var sig, sstr string
|
|
var err error
|
|
if sstr, err = t.SigningString(); err != nil {
|
|
return "", err
|
|
}
|
|
if sig, err = t.Method.Sign(sstr, key); err != nil {
|
|
return "", err
|
|
}
|
|
return strings.Join([]string{sstr, sig}, "."), nil
|
|
}
|
|
|
|
// Generate the signing string. This is the
|
|
// most expensive part of the whole deal. Unless you
|
|
// need this for something special, just go straight for
|
|
// the SignedString.
|
|
func (t *Token) SigningString() (string, error) {
|
|
var err error
|
|
parts := make([]string, 2)
|
|
for i, _ := range parts {
|
|
var source map[string]interface{}
|
|
if i == 0 {
|
|
source = t.Header
|
|
} else {
|
|
source = t.Claims
|
|
}
|
|
|
|
var jsonValue []byte
|
|
if jsonValue, err = json.Marshal(source); err != nil {
|
|
return "", err
|
|
}
|
|
|
|
parts[i] = EncodeSegment(jsonValue)
|
|
}
|
|
return strings.Join(parts, "."), nil
|
|
}
|
|
|
|
// Parse, validate, and return a token.
|
|
// keyFunc will receive the parsed token and should return the key for validating.
|
|
// If everything is kosher, err will be nil
|
|
func Parse(tokenString string, keyFunc Keyfunc) (*Token, error) {
|
|
return new(Parser).Parse(tokenString, keyFunc)
|
|
}
|
|
|
|
// Try to find the token in an http.Request.
|
|
// This method will call ParseMultipartForm if there's no token in the header.
|
|
// Currently, it looks in the Authorization header as well as
|
|
// looking for an 'access_token' request parameter in req.Form.
|
|
func ParseFromRequest(req *http.Request, keyFunc Keyfunc) (token *Token, err error) {
|
|
|
|
// Look for an Authorization header
|
|
if ah := req.Header.Get("Authorization"); ah != "" {
|
|
// Should be a bearer token
|
|
if len(ah) > 6 && strings.ToUpper(ah[0:7]) == "BEARER " {
|
|
return Parse(ah, keyFunc)
|
|
}
|
|
}
|
|
|
|
// Look for "access_token" parameter
|
|
req.ParseMultipartForm(10e6)
|
|
if tokStr := req.Form.Get("access_token"); tokStr != "" {
|
|
return Parse(tokStr, keyFunc)
|
|
}
|
|
|
|
return nil, ErrNoTokenInRequest
|
|
|
|
}
|
|
|
|
// Encode JWT specific base64url encoding with padding stripped
|
|
func EncodeSegment(seg []byte) string {
|
|
return strings.TrimRight(base64.URLEncoding.EncodeToString(seg), "=")
|
|
}
|
|
|
|
// Decode JWT specific base64url encoding with padding stripped
|
|
func DecodeSegment(seg string) ([]byte, error) {
|
|
if l := len(seg) % 4; l > 0 {
|
|
seg += strings.Repeat("=", 4-l)
|
|
}
|
|
|
|
return base64.URLEncoding.DecodeString(seg)
|
|
}
|