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Move webhook handlers into their own package
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| /* | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package webhook | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "fmt" | ||
| "net/http" | ||
|
|
||
| "k8s.io/apiserver/pkg/authentication/authenticator" | ||
| "k8s.io/apiserver/pkg/authorization/authorizer" | ||
| ) | ||
|
|
||
| type userInfo struct { | ||
| Username string `json:"username"` | ||
| UID string `json:"uid"` | ||
| Groups []string `json:"groups"` | ||
| Extra map[string][]string `json:"extra"` | ||
| } | ||
| type status struct { | ||
| Authenticated bool `json:"authenticated"` | ||
| User userInfo `json:"user"` | ||
| } | ||
|
|
||
| type WebhookHandler struct { | ||
| Authenticator authenticator.Token | ||
| Authorizer authorizer.Authorizer | ||
| } | ||
|
|
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| func (h *WebhookHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { | ||
| var data map[string]interface{} | ||
| decoder := json.NewDecoder(r.Body) | ||
| defer r.Body.Close() | ||
| err := decoder.Decode(&data) | ||
| if err != nil { | ||
| http.Error(w, err.Error(), http.StatusInternalServerError) | ||
| return | ||
| } | ||
|
|
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| var apiVersion = data["apiVersion"].(string) | ||
| var kind = data["kind"].(string) | ||
|
|
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| if apiVersion != "authentication.k8s.io/v1beta1" && apiVersion != "authorization.k8s.io/v1beta1" { | ||
| http.Error(w, fmt.Sprintf("unknown apiVersion %q", apiVersion), | ||
| http.StatusBadRequest) | ||
| return | ||
| } | ||
| if kind == "TokenReview" { | ||
| var token = data["spec"].(map[string]interface{})["token"].(string) | ||
| h.authenticateToken(w, r, token, data) | ||
| } else if kind == "SubjectAccessReview" { | ||
| h.authorizeToken(w, r, data) | ||
| } else { | ||
| http.Error(w, fmt.Sprintf("unknown kind/apiVersion %q %q", kind, apiVersion), | ||
| http.StatusBadRequest) | ||
| } | ||
| } | ||
|
|
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| func (h *WebhookHandler) authenticateToken(w http.ResponseWriter, r *http.Request, token string, data map[string]interface{}) { | ||
| user, authenticated, err := h.Authenticator.AuthenticateToken(token) | ||
|
|
||
| if !authenticated { | ||
| var response status | ||
| response.Authenticated = false | ||
| data["status"] = response | ||
|
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| output, err := json.MarshalIndent(data, "", " ") | ||
| if err != nil { | ||
| http.Error(w, err.Error(), http.StatusBadRequest) | ||
| return | ||
| } | ||
| w.Header().Set("Content-Type", "application/json") | ||
| w.WriteHeader(http.StatusUnauthorized) | ||
| w.Write(output) | ||
| return | ||
| } | ||
|
|
||
| var info userInfo | ||
| info.Username = user.GetName() | ||
| info.UID = user.GetUID() | ||
| info.Groups = user.GetGroups() | ||
| info.Extra = user.GetExtra() | ||
|
|
||
| var response status | ||
| response.Authenticated = true | ||
| response.User = info | ||
|
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| data["status"] = response | ||
|
|
||
| output, err := json.MarshalIndent(data, "", " ") | ||
| if err != nil { | ||
| http.Error(w, err.Error(), http.StatusInternalServerError) | ||
| return | ||
| } | ||
| w.Header().Set("Content-Type", "application/json") | ||
| w.WriteHeader(http.StatusOK) | ||
| w.Write(output) | ||
| } | ||
|
|
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| func (h *WebhookHandler) authorizeToken(w http.ResponseWriter, r *http.Request, data map[string]interface{}) { | ||
| fmt.Printf("authorizeToken data : %#v\n", data) | ||
| temp, _ := json.MarshalIndent(data, "", " ") | ||
| fmt.Printf("REQUEST : %s\n", string(temp)) | ||
|
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| _, _, err := h.Authorizer.Authorize(nil) | ||
| if err != nil { | ||
| http.Error(w, err.Error(), http.StatusInternalServerError) | ||
| return | ||
| } | ||
|
|
||
| delete(data, "spec") | ||
| data["status"] = map[string]interface{} { | ||
| "allowed": true, | ||
| } | ||
| output, err := json.MarshalIndent(data, "", " ") | ||
| if err != nil { | ||
| http.Error(w, err.Error(), http.StatusInternalServerError) | ||
| return | ||
| } | ||
| w.Header().Set("Content-Type", "application/json") | ||
| w.WriteHeader(http.StatusOK) | ||
| w.Write(output) | ||
| } |