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api.go
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api.go
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package rest
import (
"fmt"
"github.com/golang/glog"
"github.com/gorilla/mux"
"github.com/ottogroup/penelope/pkg/builder"
"github.com/ottogroup/penelope/pkg/config"
"github.com/ottogroup/penelope/pkg/http/actions"
"github.com/ottogroup/penelope/pkg/http/auth"
"github.com/ottogroup/penelope/pkg/http/impersonate"
"github.com/ottogroup/penelope/pkg/secret"
"net/http"
"net/http/httputil"
)
// API will handle HTTP requests
type API struct {
router *mux.Router
}
type NewAPIArgs struct {
ProcessorBuilder *builder.ProcessorBuilder
AuthMiddleware *auth.AuthenticationMiddleware
TokenSourceProvider impersonate.TargetPrincipalForProjectProvider
CredentialsProvider secret.SecretProvider
}
func NewAPI(args NewAPIArgs) *API {
router := createRouter(args)
return &API{router}
}
// NewRestAPI return instance of API
func NewRestAPI(processorBuilder *builder.ProcessorBuilder, authMiddleware *auth.AuthenticationMiddleware, tokenSourceProvider impersonate.TargetPrincipalForProjectProvider, credentialsProvider secret.SecretProvider) *API {
return NewAPI(NewAPIArgs{
processorBuilder,
authMiddleware,
tokenSourceProvider,
credentialsProvider,
})
}
func createRouter(args NewAPIArgs) *mux.Router {
router := mux.NewRouter().StrictSlash(true)
for _, endpoint := range createEndpoints(args.ProcessorBuilder, args.TokenSourceProvider, args.CredentialsProvider) {
if endpoint.handler == nil {
msg := fmt.Sprintf("no handler defined for enpoint: %s", endpoint.pathWithoutTrailingSlash())
panic(msg)
}
h := endpoint.handler.ServeHTTP
if endpoint.authEnabled {
h = args.AuthMiddleware.AddAuthentication(h)
}
router.HandleFunc(endpoint.pathWithoutTrailingSlash(), h).Methods(endpoint.methods...)
glog.V(4).Infof("Handler for %s registered\n", endpoint)
}
router.NotFoundHandler = notImplementedHandler()
router.Use(loggingMiddleware)
router.Use(corsMiddleware)
return router
}
func createEndpoints(processorBuilder *builder.ProcessorBuilder, tokenSourceProvider impersonate.TargetPrincipalForProjectProvider, credentialsProvider secret.SecretProvider) []*Endpoint {
return []*Endpoint{
newAPIEndpoint(
fmt.Sprintf("%s/{backup_id}", backupPath),
true,
actions.NewUpdateBackupHandler(processorBuilder).ServeHTTP,
[]string{http.MethodPatch},
),
newAPIEndpoint(
backupPath,
true,
actions.NewUpdateBackupHandler(processorBuilder).ServeHTTP,
[]string{http.MethodPatch},
),
newAPIEndpoint(
fmt.Sprintf("%s/calculate", backupPath),
true,
actions.NewCalculateBackupHandler(processorBuilder).ServeHTTP,
[]string{http.MethodPost},
),
newAPIEndpoint(
backupPath,
true,
actions.NewAddBackupHandler(processorBuilder).ServeHTTP,
[]string{http.MethodPost},
),
newAPIEndpoint(
fmt.Sprintf("%s/{backup_id}", backupPath),
true,
actions.NewGettingBackupHandler(processorBuilder).ServeHTTP,
[]string{http.MethodGet},
),
newAPIEndpoint(
backupPath,
true,
actions.NewListingBackupHandler(processorBuilder).ServeHTTP,
[]string{http.MethodGet},
),
newAPIEndpoint(
fmt.Sprintf("%s/{task}", tasksPath),
false,
actions.NewTaskRunHandler(tokenSourceProvider, credentialsProvider).ServeHTTP,
[]string{http.MethodGet},
),
newAPIEndpoint(
tasksPath,
false,
actions.NewTaskRunHandler(tokenSourceProvider, credentialsProvider).ServeHTTP,
[]string{http.MethodGet},
),
newAPIEndpoint(
fmt.Sprintf("%s/me", userPath),
true,
actions.NewGetUserMeHandler().ServeHTTP,
[]string{http.MethodGet},
),
newAPIEndpoint(
fmt.Sprintf("%s/{backup_id}", restorePath),
true,
actions.NewRestoringBackupHandler(processorBuilder).ServeHTTP,
[]string{http.MethodGet},
),
newAPIEndpoint(
restorePath,
true,
actions.NewRestoringBackupHandler(processorBuilder).ServeHTTP,
[]string{http.MethodGet},
),
newAPIEndpoint(
fmt.Sprintf("%s/{project_id}", datasetsPath),
true,
actions.NewDatasetListingHandler(processorBuilder).ServeHTTP,
[]string{http.MethodGet},
),
newAPIEndpoint(
fmt.Sprintf("%s/{project_id}", bucketsPath),
true,
actions.NewBucketListingHandler(processorBuilder).ServeHTTP,
[]string{http.MethodGet},
),
newAPIEndpoint(
bucketsPath,
true,
actions.NewBucketListingHandler(processorBuilder).ServeHTTP,
[]string{http.MethodGet},
),
newCustomEndpoint(
healthCheckPath,
"health",
false,
handleHeathCheck,
[]string{http.MethodGet},
),
}
}
func (a *API) ServeHTTP(w http.ResponseWriter, r *http.Request) {
a.router.ServeHTTP(w, r)
}
// Register routine that will wait for the HTTP requests
func (a *API) Register() {
http.Handle("/", a.router)
glog.Infoln("Rest api handler registered")
}
func notImplementedHandler() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusNotImplemented)
if _, err := fmt.Fprintf(w, "Unkown api endpoint %s", r.URL.Path); err != nil {
glog.Warningf("Error writing response for %s: %s", r.URL.Path, err)
}
})
}
func corsMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
w.Header().Set("Access-Control-Allow-Methods", config.CorsAllowedMethods.GetOrDefault(""))
w.Header().Set("Access-Control-Allow-Origin", config.CorsAllowedOrigin.GetOrDefault(""))
w.Header().Set("Access-Control-Allow-Headers", config.CorsAllowedHeaders.GetOrDefault(""))
if req.Method == http.MethodOptions {
w.WriteHeader(http.StatusOK)
} else {
next.ServeHTTP(w, req)
}
})
}
func loggingMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if glog.V(4) {
dump, err := httputil.DumpRequest(r, true)
if err != nil {
glog.Warningf("Could not dump http request for %s: %s", r.URL.Path, err)
} else {
glog.Infof("HTTP request dump:\n %s", string(dump))
}
} else {
method := r.Method
if method == "" {
method = " GET"
}
glog.Infof("Processing HTTP request %s %s", method, r.URL.Path)
}
next.ServeHTTP(w, r)
})
}
func handleHeathCheck(w http.ResponseWriter, _ *http.Request) {
w.WriteHeader(http.StatusOK)
}