minio/cmd/web-router.go
Harshavardhana 822eb5ddc7 Bring in safe mode support (#8478)
This PR refactors object layer handling such
that upon failure in sub-system initialization
server reaches a stage of safe-mode operation
wherein only certain API operations are enabled
and available.

This allows for fixing many scenarios such as

 - incorrect configuration in vault, etcd,
   notification targets
 - missing files, incomplete config migrations
   unable to read encrypted content etc
 - any other issues related to notification,
   policies, lifecycle etc
2019-11-09 09:27:23 -08:00

104 lines
3.4 KiB
Go

/*
* MinIO Cloud Storage, (C) 2016 MinIO, Inc.
*
* 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 cmd
import (
"fmt"
"net/http"
assetfs "github.com/elazarl/go-bindata-assetfs"
"github.com/gorilla/handlers"
"github.com/gorilla/mux"
jsonrpc "github.com/gorilla/rpc/v2"
"github.com/gorilla/rpc/v2/json2"
"github.com/minio/minio/browser"
)
// webAPI container for Web API.
type webAPIHandlers struct {
ObjectAPI func() ObjectLayer
CacheAPI func() CacheObjectLayer
}
// indexHandler - Handler to serve index.html
type indexHandler struct {
handler http.Handler
}
func (h indexHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
r.URL.Path = minioReservedBucketPath + SlashSeparator
h.handler.ServeHTTP(w, r)
}
const assetPrefix = "production"
func assetFS() *assetfs.AssetFS {
return &assetfs.AssetFS{
Asset: browser.Asset,
AssetDir: browser.AssetDir,
AssetInfo: browser.AssetInfo,
Prefix: assetPrefix,
}
}
// specialAssets are files which are unique files not embedded inside index_bundle.js.
const specialAssets = "index_bundle.*.js|loader.css|logo.svg|firefox.png|safari.png|chrome.png|favicon-16x16.png|favicon-32x32.png|favicon-96x96.png"
// registerWebRouter - registers web router for serving minio browser.
func registerWebRouter(router *mux.Router) error {
// Initialize Web.
web := &webAPIHandlers{
ObjectAPI: newObjectLayerFn,
CacheAPI: newCachedObjectLayerFn,
}
// Initialize a new json2 codec.
codec := json2.NewCodec()
// MinIO browser router.
webBrowserRouter := router.PathPrefix(minioReservedBucketPath).HeadersRegexp("User-Agent", ".*Mozilla.*").Subrouter()
// Initialize json rpc handlers.
webRPC := jsonrpc.NewServer()
webRPC.RegisterCodec(codec, "application/json")
webRPC.RegisterCodec(codec, "application/json; charset=UTF-8")
// Register RPC handlers with server
if err := webRPC.RegisterService(web, "Web"); err != nil {
return err
}
// RPC handler at URI - /minio/webrpc
webBrowserRouter.Methods("POST").Path("/webrpc").Handler(webRPC)
webBrowserRouter.Methods("PUT").Path("/upload/{bucket}/{object:.+}").HandlerFunc(httpTraceHdrs(web.Upload))
// These methods use short-expiry tokens in the URLs. These tokens may unintentionally
// be logged, so a new one must be generated for each request.
webBrowserRouter.Methods("GET").Path("/download/{bucket}/{object:.+}").Queries("token", "{token:.*}").HandlerFunc(httpTraceHdrs(web.Download))
webBrowserRouter.Methods("POST").Path("/zip").Queries("token", "{token:.*}").HandlerFunc(httpTraceHdrs(web.DownloadZip))
// Create compressed assets handler
compressAssets := handlers.CompressHandler(http.StripPrefix(minioReservedBucketPath, http.FileServer(assetFS())))
// Serve javascript files and favicon from assets.
webBrowserRouter.Path(fmt.Sprintf("/{assets:%s}", specialAssets)).Handler(compressAssets)
// Serve index.html from assets for rest of the requests.
webBrowserRouter.Path("/{index:.*}").Handler(indexHandler{compressAssets})
return nil
}