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349 lines
10 KiB
349 lines
10 KiB
/*
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* Minio Cloud Storage, (C) 2015, 2016 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 cmd
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import (
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"net/http"
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"path"
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"strings"
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"time"
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humanize "github.com/dustin/go-humanize"
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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 limiting body size middleware
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// Maximum allowed form data field values. 64MiB is a guessed practical value
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// which is more than enough to accommodate any form data fields and headers.
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const requestFormDataSize = 64 * humanize.MiByte
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// For any HTTP request, request body should be not more than 5GiB + requestFormDataSize
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// where, 5GiB is the maximum allowed object size for object upload.
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const requestMaxBodySize = 5*humanize.GiByte + requestFormDataSize
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type requestSizeLimitHandler struct {
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handler http.Handler
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maxBodySize int64
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}
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func setRequestSizeLimitHandler(h http.Handler) http.Handler {
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return requestSizeLimitHandler{handler: h, maxBodySize: requestMaxBodySize}
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}
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func (h requestSizeLimitHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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// Restricting read data to a given maximum length
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r.Body = http.MaxBytesReader(w, r.Body, h.maxBodySize)
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h.handler.ServeHTTP(w, r)
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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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// Adds redirect rules for incoming requests.
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type redirectHandler struct {
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handler http.Handler
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}
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func setBrowserRedirectHandler(h http.Handler) http.Handler {
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return redirectHandler{handler: h}
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}
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// Fetch redirect location if urlPath satisfies certain
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// criteria. Some special names are considered to be
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// redirectable, this is purely internal function and
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// serves only limited purpose on redirect-handler for
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// browser requests.
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func getRedirectLocation(urlPath string) (rLocation string) {
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if urlPath == reservedBucket {
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rLocation = reservedBucket + "/"
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}
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if contains([]string{
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"/",
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"/webrpc",
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"/login",
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"/favicon.ico",
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}, urlPath) {
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rLocation = reservedBucket + urlPath
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}
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return rLocation
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}
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// guessIsBrowserReq - returns true if the request is browser.
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// This implementation just validates user-agent and
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// looks for "Mozilla" string. This is no way certifiable
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// way to know if the request really came from a browser
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// since User-Agent's can be arbitrary. But this is just
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// a best effort function.
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func guessIsBrowserReq(req *http.Request) bool {
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if req == nil {
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return false
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}
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return strings.Contains(req.Header.Get("User-Agent"), "Mozilla")
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}
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func (h redirectHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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aType := getRequestAuthType(r)
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// Re-direct only for JWT and anonymous requests from browser.
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if aType == authTypeJWT || aType == authTypeAnonymous {
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// Re-direction is handled specifically for browser requests.
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if guessIsBrowserReq(r) && globalIsBrowserEnabled {
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// Fetch the redirect location if any.
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redirectLocation := getRedirectLocation(r.URL.Path)
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if redirectLocation != "" {
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// Employ a temporary re-direct.
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http.Redirect(w, r, redirectLocation, http.StatusTemporaryRedirect)
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return
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}
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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" && guessIsBrowserReq(r) && globalIsBrowserEnabled {
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// For all browser requests set appropriate Cache-Control policies
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if strings.HasPrefix(r.URL.Path, reservedBucket+"/") {
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if strings.HasSuffix(r.URL.Path, ".js") || r.URL.Path == reservedBucket+"/favicon.ico" {
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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 {
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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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}
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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 !guessIsBrowserReq(r) && 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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type timeValidityHandler 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 timeValidityHandler{h}
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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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// Supported Amz date headers.
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var amzDateHeaders = []string{
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"x-amz-date",
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"date",
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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, err := time.Parse(dateFormat, amzDateStr)
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if err == 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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// 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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func (h timeValidityHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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aType := getRequestAuthType(r)
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if aType == authTypeSigned || aType == authTypeSignedV2 || aType == authTypeStreamingSigned {
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// Verify if date headers are set, if not reject the request
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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 shifted by less than globalMaxSkewTime parameter in the past
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// or in the future, reject request otherwise.
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curTime := time.Now().UTC()
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if curTime.Sub(amzDate) > globalMaxSkewTime || amzDate.Sub(curTime) > globalMaxSkewTime {
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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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ExposedHeaders: []string{"ETag"},
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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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// 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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"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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// 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 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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// Serve HTTP.
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h.handler.ServeHTTP(w, r)
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}
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