github.com/dbernstein1/tyk@v2.9.0-beta9-dl-apic+incompatible/gateway/mw_oauth2_key_exists.go (about)

     1  package gateway
     2  
     3  import (
     4  	"errors"
     5  	"net/http"
     6  	"strings"
     7  	"time"
     8  
     9  	"github.com/TykTechnologies/tyk/apidef"
    10  	"github.com/TykTechnologies/tyk/headers"
    11  )
    12  
    13  const (
    14  	checkOAuthClientDeletedInetrval = 1 * time.Second
    15  )
    16  
    17  // Oauth2KeyExists will check if the key being used to access the API is in the request data,
    18  // and then if the key is in the storage engine
    19  type Oauth2KeyExists struct {
    20  	BaseMiddleware
    21  }
    22  
    23  func (k *Oauth2KeyExists) Name() string {
    24  	return "Oauth2KeyExists"
    25  }
    26  
    27  func (k *Oauth2KeyExists) EnabledForSpec() bool {
    28  	return k.Spec.UseOauth2
    29  }
    30  
    31  // ProcessRequest will run any checks on the request on the way through the system, return an error to have the chain fail
    32  func (k *Oauth2KeyExists) ProcessRequest(w http.ResponseWriter, r *http.Request, _ interface{}) (error, int) {
    33  	logger := k.Logger()
    34  	// We're using OAuth, start checking for access keys
    35  	token := r.Header.Get(headers.Authorization)
    36  	parts := strings.Split(token, " ")
    37  
    38  	if len(parts) < 2 {
    39  		logger.Info("Attempted access with malformed header, no auth header found.")
    40  
    41  		return errors.New("Authorization field missing"), http.StatusBadRequest
    42  	}
    43  
    44  	if strings.ToLower(parts[0]) != "bearer" {
    45  		logger.Info("Bearer token malformed")
    46  
    47  		return errors.New("Bearer token malformed"), http.StatusBadRequest
    48  	}
    49  
    50  	accessToken := parts[1]
    51  	logger = logger.WithField("key", obfuscateKey(accessToken))
    52  
    53  	// get session for the given oauth token
    54  	session, keyExists := k.CheckSessionAndIdentityForValidKey(accessToken, r)
    55  	if !keyExists {
    56  		logger.Warning("Attempted access with non-existent key.")
    57  
    58  		// Fire Authfailed Event
    59  		AuthFailed(k, r, accessToken)
    60  		// Report in health check
    61  		reportHealthValue(k.Spec, KeyFailure, "-1")
    62  
    63  		return errors.New("Key not authorised"), http.StatusForbidden
    64  	}
    65  
    66  	// Make sure OAuth-client is still present
    67  	oauthClientDeletedKey := "oauth-del-" + k.Spec.APIID + session.OauthClientID
    68  	oauthClientDeleted := false
    69  	// check if that oauth client was deleted with using  memory cache first
    70  	if val, found := UtilCache.Get(oauthClientDeletedKey); found {
    71  		oauthClientDeleted = val.(bool)
    72  	} else {
    73  		// if not cached in memory then hit Redis to get oauth-client from there
    74  		if _, err := k.Spec.OAuthManager.OsinServer.Storage.GetClient(session.OauthClientID); err != nil {
    75  			// set this oauth client as deleted in memory cache forever
    76  			UtilCache.Set(oauthClientDeletedKey, true, -1)
    77  			oauthClientDeleted = true
    78  		} else {
    79  			// set this oauth client as NOT deleted in memory cache for next N sec
    80  			UtilCache.Set(oauthClientDeletedKey, false, checkOAuthClientDeletedInetrval)
    81  		}
    82  	}
    83  	if oauthClientDeleted {
    84  		logger.WithField("oauthClientID", session.OauthClientID).Warning("Attempted access for deleted OAuth client.")
    85  		return errors.New("Key not authorised. OAuth client access was revoked"), http.StatusForbidden
    86  	}
    87  
    88  	// Set session state on context, we will need it later
    89  	switch k.Spec.BaseIdentityProvidedBy {
    90  	case apidef.OAuthKey, apidef.UnsetAuth:
    91  		ctxSetSession(r, &session, accessToken, false)
    92  	}
    93  
    94  	// Request is valid, carry on
    95  	return nil, http.StatusOK
    96  }