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feat: add middleware to validate mycarehub tokens
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| package rest | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/json" | ||
| "fmt" | ||
| "io" | ||
| "net/http" | ||
| "net/url" | ||
| "strings" | ||
| "time" | ||
|
|
||
| "github.com/gin-gonic/gin" | ||
| "github.com/savannahghi/authutils" | ||
| "github.com/savannahghi/firebasetools" | ||
| "github.com/savannahghi/serverutils" | ||
| ) | ||
|
|
||
| var ( | ||
| clientID = serverutils.MustGetEnvVar("MYCAREHUB_CLIENT_ID") | ||
| clientSecret = serverutils.MustGetEnvVar("MYCAREHUB_CLIENT_SECRET") | ||
| introspectURL = serverutils.MustGetEnvVar("MYCAREHUB_INTROSPECT_URL") | ||
| ) | ||
|
|
||
| type IntrospectResponse struct { | ||
| Active bool `json:"active"` | ||
| UserID string `json:"user_id"` | ||
| } | ||
|
|
||
| func HasValidMycarehubBearerToken(_ context.Context, r *http.Request) (bool, map[string]string, *authutils.TokenIntrospectionResponse) { | ||
| token, err := firebasetools.ExtractBearerToken(r) | ||
| if err != nil { | ||
| return false, serverutils.ErrorMap(err), nil | ||
| } | ||
|
|
||
| formData := url.Values{ | ||
| "token": []string{token}, | ||
| } | ||
|
|
||
| client := &http.Client{ | ||
| Timeout: 5 * time.Second, | ||
| } | ||
|
|
||
| req, err := http.NewRequest(http.MethodPost, introspectURL, strings.NewReader(formData.Encode())) | ||
| if err != nil { | ||
| return false, serverutils.ErrorMap(err), nil | ||
| } | ||
|
|
||
| req.Header.Set("Content-Type", "application/x-www-form-urlencoded") | ||
| req.SetBasicAuth(clientID, clientSecret) | ||
|
|
||
| resp, err := client.Do(req) | ||
| if err != nil { | ||
| return false, serverutils.ErrorMap(err), nil | ||
| } | ||
|
|
||
| defer func() { | ||
| err = resp.Body.Close() | ||
| if err != nil { | ||
| fmt.Printf("Introspector() failed to close body:%s", err) | ||
| } | ||
| }() | ||
|
|
||
| if resp.StatusCode != http.StatusOK { | ||
| err := fmt.Errorf("failed to introspect token") | ||
| return false, serverutils.ErrorMap(err), nil | ||
| } | ||
|
|
||
| var introspection IntrospectResponse | ||
|
|
||
| bs, err := io.ReadAll(resp.Body) | ||
| if err != nil { | ||
| return false, serverutils.ErrorMap(err), nil | ||
| } | ||
|
|
||
| if err := json.Unmarshal(bs, &introspection); err != nil { | ||
| return false, serverutils.ErrorMap(err), nil | ||
| } | ||
|
|
||
| if !introspection.Active { | ||
| err := fmt.Errorf("the supplied access token is invalid") | ||
| return false, serverutils.ErrorMap(err), nil | ||
| } | ||
|
|
||
| return true, nil, &authutils.TokenIntrospectionResponse{Token: token, UserGUID: introspection.UserID, IsValid: introspection.Active} | ||
| } | ||
|
|
||
| // authCheckFn is a function type for authorization and authentication checks | ||
| // there can be several e.g an authentication check runs first then an authorization | ||
| // check runs next if the authentication passes etc | ||
| type authCheckFn = func( | ||
| ctx context.Context, | ||
| r *http.Request, | ||
| ) (bool, map[string]string, *authutils.TokenIntrospectionResponse) | ||
|
|
||
| // AuthenticationGinMiddleware is an authentication middleware for servers using Gin. It checks the user token and ensures | ||
| // that it is valid | ||
| func AuthenticationGinMiddleware(cl authutils.Client) gin.HandlerFunc { | ||
| checkFuncs := []authCheckFn{cl.HasValidSlade360BearerToken, HasValidMycarehubBearerToken} | ||
|
|
||
| return func(c *gin.Context) { | ||
| var successful bool | ||
|
|
||
| var tokenResponse *authutils.TokenIntrospectionResponse | ||
|
|
||
| errs := []map[string]string{} | ||
|
|
||
| for _, checkFunc := range checkFuncs { | ||
| valid, errMap, authToken := checkFunc(c.Request.Context(), c.Request) | ||
| if valid { | ||
| successful = true | ||
| tokenResponse = authToken | ||
|
|
||
| break | ||
| } | ||
|
|
||
| errs = append(errs, errMap) | ||
| } | ||
|
|
||
| if !successful { | ||
| serverutils.WriteJSONResponse(c.Writer, errs, http.StatusUnauthorized) | ||
| c.Abort() | ||
| } | ||
|
|
||
| ctx := context.WithValue(c.Request.Context(), authutils.AuthTokenContextKey, tokenResponse) | ||
| c.Request = c.Request.WithContext(ctx) | ||
| c.Next() | ||
| } | ||
| } |