forked from mirror/jwt
Introduce (*Parser).ParseUnverified
This is not something users of this library would commonly use but I'm hitting a case where I still want to transmit the values contained inside of the token trough the system, after it's been verified by the frontend. In that case it would be easier just to transmit the token around and be able to parse the values within, without having to verify the signature. The backend services also don't have access to the user secrets to validate the signature.
This commit is contained in:
zimbatm
parent
24c63f5652
commit
bf316c4813
110
parser.go
110
parser.go
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@ -21,55 +21,9 @@ func (p *Parser) Parse(tokenString string, keyFunc Keyfunc) (*Token, error) {
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}
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func (p *Parser) ParseWithClaims(tokenString string, claims Claims, keyFunc Keyfunc) (*Token, error) {
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parts := strings.Split(tokenString, ".")
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if len(parts) != 3 {
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return nil, NewValidationError("token contains an invalid number of segments", ValidationErrorMalformed)
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}
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var err error
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token := &Token{Raw: tokenString}
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// parse Header
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var headerBytes []byte
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if headerBytes, err = DecodeSegment(parts[0]); err != nil {
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if strings.HasPrefix(strings.ToLower(tokenString), "bearer ") {
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return token, NewValidationError("tokenstring should not contain 'bearer '", ValidationErrorMalformed)
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}
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return token, &ValidationError{Inner: err, Errors: ValidationErrorMalformed}
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}
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if err = json.Unmarshal(headerBytes, &token.Header); err != nil {
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return token, &ValidationError{Inner: err, Errors: ValidationErrorMalformed}
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}
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// parse Claims
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var claimBytes []byte
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token.Claims = claims
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if claimBytes, err = DecodeSegment(parts[1]); err != nil {
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return token, &ValidationError{Inner: err, Errors: ValidationErrorMalformed}
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}
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dec := json.NewDecoder(bytes.NewBuffer(claimBytes))
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if p.UseJSONNumber {
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dec.UseNumber()
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}
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// JSON Decode. Special case for map type to avoid weird pointer behavior
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if c, ok := token.Claims.(MapClaims); ok {
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err = dec.Decode(&c)
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} else {
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err = dec.Decode(&claims)
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}
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// Handle decode error
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token, parts, err := p.ParseUnverified(tokenString, claims)
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if err != nil {
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return token, &ValidationError{Inner: err, Errors: ValidationErrorMalformed}
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}
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// Lookup signature method
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if method, ok := token.Header["alg"].(string); ok {
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if token.Method = GetSigningMethod(method); token.Method == nil {
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return token, NewValidationError("signing method (alg) is unavailable.", ValidationErrorUnverifiable)
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}
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} else {
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return token, NewValidationError("signing method (alg) is unspecified.", ValidationErrorUnverifiable)
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return token, err
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}
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// Verify signing method is in the required set
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@ -129,3 +83,63 @@ func (p *Parser) ParseWithClaims(tokenString string, claims Claims, keyFunc Keyf
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return token, vErr
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}
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// WARNING: Don't use this method unless you know what you're doing
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//
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// This method parses the token but doesn't validate the signature. It's only
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// ever useful in cases where you know the signature is valid (because it has
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// been checked previously in the stack) and you want to extract values from
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// it.
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func (p *Parser) ParseUnverified(tokenString string, claims Claims) (token *Token, parts []string, err error) {
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parts = strings.Split(tokenString, ".")
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if len(parts) != 3 {
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return nil, parts, NewValidationError("token contains an invalid number of segments", ValidationErrorMalformed)
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}
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token = &Token{Raw: tokenString}
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// parse Header
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var headerBytes []byte
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if headerBytes, err = DecodeSegment(parts[0]); err != nil {
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if strings.HasPrefix(strings.ToLower(tokenString), "bearer ") {
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return token, parts, NewValidationError("tokenstring should not contain 'bearer '", ValidationErrorMalformed)
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}
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return token, parts, &ValidationError{Inner: err, Errors: ValidationErrorMalformed}
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}
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if err = json.Unmarshal(headerBytes, &token.Header); err != nil {
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return token, parts, &ValidationError{Inner: err, Errors: ValidationErrorMalformed}
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}
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// parse Claims
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var claimBytes []byte
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token.Claims = claims
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if claimBytes, err = DecodeSegment(parts[1]); err != nil {
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return token, parts, &ValidationError{Inner: err, Errors: ValidationErrorMalformed}
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}
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dec := json.NewDecoder(bytes.NewBuffer(claimBytes))
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if p.UseJSONNumber {
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dec.UseNumber()
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}
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// JSON Decode. Special case for map type to avoid weird pointer behavior
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if c, ok := token.Claims.(MapClaims); ok {
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err = dec.Decode(&c)
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} else {
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err = dec.Decode(&claims)
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}
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// Handle decode error
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if err != nil {
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return token, parts, &ValidationError{Inner: err, Errors: ValidationErrorMalformed}
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}
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// Lookup signature method
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if method, ok := token.Header["alg"].(string); ok {
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if token.Method = GetSigningMethod(method); token.Method == nil {
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return token, parts, NewValidationError("signing method (alg) is unavailable.", ValidationErrorUnverifiable)
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}
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} else {
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return token, parts, NewValidationError("signing method (alg) is unspecified.", ValidationErrorUnverifiable)
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}
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return token, parts, nil
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}
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