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// -
// ========================LICENSE_START=================================
// Copyright (C) 2024-2025: Deutsche Telekom
//
// 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.
// SPDX-License-Identifier: Apache-2.0
// ========================LICENSE_END===================================
// Package api provides HTTP handlers for the policy-opa-pdp service.
// This package includes handlers for decision making, bundle serving, health checks, and readiness probes.
// It also includes basic authentication middleware for securing certain endpoints.
package api
import (
"net/http"
"policy-opa-pdp/cfg"
"policy-opa-pdp/pkg/data"
"policy-opa-pdp/pkg/decision"
"policy-opa-pdp/pkg/healthcheck"
"policy-opa-pdp/pkg/log"
"policy-opa-pdp/pkg/metrics"
"policy-opa-pdp/pkg/opasdk"
)
// RegisterHandlers registers the HTTP handlers for the service.
func RegisterHandlers() {
// Handler for OPA decision making
opaDecisionHandler := http.HandlerFunc(decision.OpaDecision)
http.Handle("/policy/pdpo/v1/decision", basicAuth(opaDecisionHandler))
// Handler for kubernetes readiness probe
readinessProbeHandler := http.HandlerFunc(readinessProbe)
http.Handle("/ready", readinessProbeHandler)
// Handler for health checks
healthCheckHandler := http.HandlerFunc(healthcheck.HealthCheckHandler)
http.HandleFunc("/policy/pdpo/v1/healthcheck", basicAuth(healthCheckHandler))
// Handler for statistics report
statisticsReportHandler := http.HandlerFunc(metrics.FetchCurrentStatistics)
http.HandleFunc("/policy/pdpo/v1/statistics", basicAuth(statisticsReportHandler))
listPoliciesHandler := http.HandlerFunc(opasdk.ListPolicies)
http.Handle("/opa/listpolicies", listPoliciesHandler)
dataHandler := http.HandlerFunc(data.DataHandler)
http.Handle("/policy/pdpo/v1/data/", basicAuth(dataHandler))
http.Handle("/policy/pdpo/v1/data", basicAuth(dataHandler))
}
// handles authentication
func basicAuth(next http.HandlerFunc) http.HandlerFunc {
return func(res http.ResponseWriter, req *http.Request) {
user, pass, ok := req.BasicAuth()
if !ok || !validateCredentials(user, pass) {
res.Header().Set("WWW-Authenticate", `Basic realm="Restricted"`)
http.Error(res, "Unauthorized", http.StatusUnauthorized)
return
}
next(res, req)
}
}
// validates Credentials for http server
func validateCredentials(username, password string) bool {
validUser := cfg.Username
validPass := cfg.Password
return username == validUser && password == validPass
}
// handles readiness probe endpoint
func readinessProbe(res http.ResponseWriter, req *http.Request) {
res.WriteHeader(http.StatusOK)
_, err := res.Write([]byte("Ready"))
if err != nil {
log.Errorf("Failed to write response: %v", err)
}
}
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