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Grabs the issuer after parsing the token and tries to verify it using the issuer's well known JWKS.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| package middleware | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "log" | ||
| "net/http" | ||
| "net/url" | ||
| "time" | ||
|
|
||
| "github.com/MicahParks/keyfunc" | ||
| "github.com/gin-gonic/gin" | ||
| "github.com/golang-jwt/jwt/v4" | ||
| ) | ||
|
|
||
| func JWKS() gin.HandlerFunc { | ||
| return func(c *gin.Context) { | ||
| auth := c.GetHeader("Authorization") | ||
| encodedToken := auth[len("Bearer "):] | ||
| p := jwt.Parser{} | ||
| t, _, err := p.ParseUnverified(encodedToken, &jwt.RegisteredClaims{}) | ||
| if err != nil { | ||
| log.Printf("failed parsing token: %s", err) | ||
| c.AbortWithStatus(http.StatusBadRequest) | ||
| return | ||
| } | ||
|
|
||
| iss := t.Claims.(*jwt.RegisteredClaims).Issuer | ||
| jwksURL, err := url.Parse(iss + "/.well-known/jwks.json") | ||
| if err != nil { | ||
| log.Printf("invalid issuer URL: %s", err) | ||
| c.AbortWithStatus(http.StatusBadRequest) | ||
| return | ||
| } | ||
|
|
||
| err = validateToken(encodedToken, jwksURL.String()) | ||
| if err != nil { | ||
| log.Printf("could not validate token: %s", err) | ||
| c.AbortWithStatus(http.StatusUnauthorized) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func validateToken(encToken string, jwksURL string) error { | ||
| ctx, cancel := context.WithCancel(context.Background()) | ||
| defer cancel() | ||
| options := keyfunc.Options{ | ||
| Ctx: ctx, | ||
| RefreshErrorHandler: func(err error) { | ||
| log.Printf("refreshing JWKS failed: %s", err) | ||
| }, | ||
| RefreshInterval: time.Hour, | ||
| RefreshRateLimit: time.Minute * 5, | ||
| RefreshTimeout: time.Second * 10, | ||
| RefreshUnknownKID: true, | ||
| } | ||
|
|
||
| jwks, err := keyfunc.Get(jwksURL, options) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| var token *jwt.Token | ||
| if token, err = jwt.Parse(encToken, jwks.Keyfunc); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if !token.Valid { | ||
| return fmt.Errorf("invalid jwt token") | ||
| } | ||
| log.Println("The token is valid.") | ||
|
|
||
| return nil | ||
| } |
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