02ad48466d
The reasoning is that we can reply back with wide range of S3 error responses, which would provide more richer context to S3 client. Fixes #1267
293 lines
8.3 KiB
Go
293 lines
8.3 KiB
Go
/*
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* Minio Cloud Storage, (C) 2015 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package main
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import (
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"net/http"
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"path"
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"regexp"
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"strings"
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"time"
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router "github.com/gorilla/mux"
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"github.com/rs/cors"
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)
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// HandlerFunc - useful to chain different middleware http.Handler
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type HandlerFunc func(http.Handler) http.Handler
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func registerHandlers(mux *router.Router, handlerFns ...HandlerFunc) http.Handler {
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var f http.Handler
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f = mux
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for _, hFn := range handlerFns {
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f = hFn(f)
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}
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return f
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}
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// Adds redirect rules for incoming requests.
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type redirectHandler struct {
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handler http.Handler
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locationPrefix string
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}
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// Reserved bucket.
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const (
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reservedBucket = "/minio"
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)
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func setBrowserRedirectHandler(h http.Handler) http.Handler {
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return redirectHandler{handler: h, locationPrefix: reservedBucket}
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}
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func (h redirectHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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// Re-direction handled specifically for browsers.
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if strings.Contains(r.Header.Get("User-Agent"), "Mozilla") {
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// '/' is redirected to 'locationPrefix/'
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// '/rpc' is redirected to 'locationPrefix/rpc'
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// '/login' is redirected to 'locationPrefix/login'
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switch r.URL.Path {
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case "/", "/rpc", "/login", "/favicon.ico":
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location := h.locationPrefix + r.URL.Path
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// Redirect to new location.
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http.Redirect(w, r, location, http.StatusTemporaryRedirect)
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return
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}
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}
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h.handler.ServeHTTP(w, r)
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}
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// Adds Cache-Control header
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type cacheControlHandler struct {
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handler http.Handler
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}
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func setBrowserCacheControlHandler(h http.Handler) http.Handler {
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return cacheControlHandler{h}
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}
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func (h cacheControlHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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if r.Method == "GET" && strings.Contains(r.Header.Get("User-Agent"), "Mozilla") {
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// For all browser requests set appropriate Cache-Control policies
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match, e := regexp.MatchString(reservedBucket+`/([^/]+\.js|favicon.ico)`, r.URL.Path)
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if e != nil {
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writeErrorResponse(w, r, ErrInternalError, r.URL.Path)
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return
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}
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if match {
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// For assets set cache expiry of one year. For each release, the name
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// of the asset name will change and hence it can not be served from cache.
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w.Header().Set("Cache-Control", "max-age=31536000")
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} else if strings.HasPrefix(r.URL.Path, reservedBucket+"/") {
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// For non asset requests we serve index.html which will never be cached.
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w.Header().Set("Cache-Control", "no-store")
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}
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}
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h.handler.ServeHTTP(w, r)
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}
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// Adds verification for incoming paths.
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type minioPrivateBucketHandler struct {
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handler http.Handler
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reservedBucket string
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}
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func setPrivateBucketHandler(h http.Handler) http.Handler {
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return minioPrivateBucketHandler{handler: h, reservedBucket: reservedBucket}
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}
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func (h minioPrivateBucketHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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// For all non browser requests, reject access to 'reservedBucket'.
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if !strings.Contains(r.Header.Get("User-Agent"), "Mozilla") && path.Clean(r.URL.Path) == reservedBucket {
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writeErrorResponse(w, r, ErrAllAccessDisabled, r.URL.Path)
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return
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}
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h.handler.ServeHTTP(w, r)
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}
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// Supported Amz date formats.
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var amzDateFormats = []string{
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time.RFC1123,
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time.RFC1123Z,
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iso8601Format,
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// Add new AMZ date formats here.
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}
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// parseAmzDate - parses date string into supported amz date formats.
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func parseAmzDate(amzDateStr string) (amzDate time.Time, apiErr APIErrorCode) {
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for _, dateFormat := range amzDateFormats {
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amzDate, e := time.Parse(dateFormat, amzDateStr)
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if e == nil {
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return amzDate, ErrNone
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}
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}
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return time.Time{}, ErrMalformedDate
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}
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// Supported Amz date headers.
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var amzDateHeaders = []string{
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"x-amz-date",
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"x-minio-date",
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"date",
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}
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// parseAmzDateHeader - parses supported amz date headers, in
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// supported amz date formats.
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func parseAmzDateHeader(req *http.Request) (time.Time, APIErrorCode) {
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for _, amzDateHeader := range amzDateHeaders {
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amzDateStr := req.Header.Get(http.CanonicalHeaderKey(amzDateHeader))
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if amzDateStr != "" {
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return parseAmzDate(amzDateStr)
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}
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}
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// Date header missing.
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return time.Time{}, ErrMissingDateHeader
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}
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type timeHandler struct {
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handler http.Handler
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}
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// setTimeValidityHandler to validate parsable time over http header
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func setTimeValidityHandler(h http.Handler) http.Handler {
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return timeHandler{h}
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}
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func (h timeHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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// Verify if date headers are set, if not reject the request
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if _, ok := r.Header["Authorization"]; ok {
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amzDate, apiErr := parseAmzDateHeader(r)
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if apiErr != ErrNone {
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// All our internal APIs are sensitive towards Date
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// header, for all requests where Date header is not
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// present we will reject such clients.
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writeErrorResponse(w, r, apiErr, r.URL.Path)
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return
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}
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// Verify if the request date header is more than 5minutes
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// late, reject such clients.
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if time.Now().UTC().Sub(amzDate)/time.Minute > time.Duration(5)*time.Minute {
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writeErrorResponse(w, r, ErrRequestTimeTooSkewed, r.URL.Path)
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return
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}
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}
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h.handler.ServeHTTP(w, r)
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}
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type resourceHandler struct {
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handler http.Handler
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}
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// setCorsHandler handler for CORS (Cross Origin Resource Sharing)
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func setCorsHandler(h http.Handler) http.Handler {
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c := cors.New(cors.Options{
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AllowedOrigins: []string{"*"},
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AllowedMethods: []string{"GET", "HEAD", "POST", "PUT"},
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AllowedHeaders: []string{"*"},
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})
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return c.Handler(h)
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}
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// setIgnoreResourcesHandler -
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// Ignore resources handler is wrapper handler used for API request resource validation
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// Since we do not support all the S3 queries, it is necessary for us to throw back a
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// valid error message indicating that requested feature is not implemented.
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func setIgnoreResourcesHandler(h http.Handler) http.Handler {
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return resourceHandler{h}
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}
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// Resource handler ServeHTTP() wrapper
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func (h resourceHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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// Skip the first element which is usually '/' and split the rest.
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splits := strings.SplitN(r.URL.Path[1:], "/", 2)
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// Save bucketName and objectName extracted from url Path.
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var bucketName, objectName string
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if len(splits) == 1 {
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bucketName = splits[0]
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}
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if len(splits) == 2 {
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bucketName = splits[0]
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objectName = splits[1]
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}
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// If bucketName is present and not objectName check for bucket
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// level resource queries.
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if bucketName != "" && objectName == "" {
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if ignoreNotImplementedBucketResources(r) {
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writeErrorResponse(w, r, ErrNotImplemented, r.URL.Path)
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return
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}
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}
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// If bucketName and objectName are present check for its resource queries.
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if bucketName != "" && objectName != "" {
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if ignoreNotImplementedObjectResources(r) {
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writeErrorResponse(w, r, ErrNotImplemented, r.URL.Path)
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return
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}
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}
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// A put method on path "/" doesn't make sense, ignore it.
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if r.Method == "PUT" && r.URL.Path == "/" {
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writeErrorResponse(w, r, ErrNotImplemented, r.URL.Path)
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return
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}
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h.handler.ServeHTTP(w, r)
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}
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//// helpers
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// Checks requests for not implemented Bucket resources
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func ignoreNotImplementedBucketResources(req *http.Request) bool {
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for name := range req.URL.Query() {
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if notimplementedBucketResourceNames[name] {
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return true
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}
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}
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return false
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}
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// Checks requests for not implemented Object resources
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func ignoreNotImplementedObjectResources(req *http.Request) bool {
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for name := range req.URL.Query() {
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if notimplementedObjectResourceNames[name] {
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return true
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}
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}
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return false
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}
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// List of not implemented bucket queries
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var notimplementedBucketResourceNames = map[string]bool{
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"acl": true,
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"cors": true,
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"lifecycle": true,
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"logging": true,
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"notification": true,
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"replication": true,
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"tagging": true,
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"versions": true,
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"requestPayment": true,
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"versioning": true,
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"website": true,
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}
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// List of not implemented object queries
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var notimplementedObjectResourceNames = map[string]bool{
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"torrent": true,
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"acl": true,
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"policy": true,
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}
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