minio/generic-handlers.go

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/*
* Minio Cloud Storage, (C) 2015 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 main
import (
"errors"
"net/http"
"strings"
"time"
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router "github.com/gorilla/mux"
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"github.com/rs/cors"
)
// MiddlewareHandler - useful to chain different middleware http.Handler
type MiddlewareHandler func(http.Handler) http.Handler
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func registerCustomMiddleware(mux *router.Router, mwHandlers ...MiddlewareHandler) http.Handler {
var f http.Handler
f = mux
for _, mw := range mwHandlers {
f = mw(f)
}
return f
}
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type timeHandler struct {
handler http.Handler
}
type resourceHandler struct {
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handler http.Handler
}
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type ignoreSignatureV2RequestHandler struct {
handler http.Handler
}
func parseDate(req *http.Request) (time.Time, error) {
amzDate := req.Header.Get(http.CanonicalHeaderKey("x-amz-date"))
switch {
case amzDate != "":
if _, err := time.Parse(time.RFC1123, amzDate); err == nil {
return time.Parse(time.RFC1123, amzDate)
}
if _, err := time.Parse(time.RFC1123Z, amzDate); err == nil {
return time.Parse(time.RFC1123Z, amzDate)
}
if _, err := time.Parse(iso8601Format, amzDate); err == nil {
return time.Parse(iso8601Format, amzDate)
}
}
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minioDate := req.Header.Get(http.CanonicalHeaderKey("x-minio-date"))
switch {
case minioDate != "":
if _, err := time.Parse(time.RFC1123, minioDate); err == nil {
return time.Parse(time.RFC1123, minioDate)
}
if _, err := time.Parse(time.RFC1123Z, minioDate); err == nil {
return time.Parse(time.RFC1123Z, minioDate)
}
if _, err := time.Parse(iso8601Format, minioDate); err == nil {
return time.Parse(iso8601Format, minioDate)
}
}
date := req.Header.Get("Date")
switch {
case date != "":
if _, err := time.Parse(time.RFC1123, date); err == nil {
return time.Parse(time.RFC1123, date)
}
if _, err := time.Parse(time.RFC1123Z, date); err == nil {
return time.Parse(time.RFC1123Z, date)
}
if _, err := time.Parse(iso8601Format, amzDate); err == nil {
return time.Parse(iso8601Format, amzDate)
}
}
return time.Time{}, errors.New("invalid request")
}
// Adds Cache-Control header
type cacheControlHandler struct {
handler http.Handler
}
func setCacheControlHandler(h http.Handler) http.Handler {
return cacheControlHandler{h}
}
func (h cacheControlHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if r.Method == "GET" {
// expire the cache in one week
w.Header().Set("Cache-Control", "public, max-age=604800")
}
h.handler.ServeHTTP(w, r)
}
// TimeValidityHandler to validate parsable time over http header
func TimeValidityHandler(h http.Handler) http.Handler {
return timeHandler{h}
}
func (h timeHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
// Verify if date headers are set, if not reject the request
if r.Header.Get("Authorization") != "" {
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if r.Header.Get(http.CanonicalHeaderKey("x-amz-date")) == "" && r.Header.Get(http.CanonicalHeaderKey("x-minio-date")) == "" && r.Header.Get("Date") == "" {
// there is no way to knowing if this is a valid request, could be a attack reject such clients
writeErrorResponse(w, r, RequestTimeTooSkewed, r.URL.Path)
return
}
date, err := parseDate(r)
if err != nil {
// there is no way to knowing if this is a valid request, could be a attack reject such clients
writeErrorResponse(w, r, RequestTimeTooSkewed, r.URL.Path)
return
}
duration := time.Since(date)
minutes := time.Duration(5) * time.Minute
if duration.Minutes() > minutes.Minutes() {
writeErrorResponse(w, r, RequestTimeTooSkewed, r.URL.Path)
return
}
}
h.handler.ServeHTTP(w, r)
}
// CorsHandler handler for CORS (Cross Origin Resource Sharing)
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func CorsHandler(h http.Handler) http.Handler {
c := cors.New(cors.Options{
AllowedOrigins: []string{"*"},
AllowedMethods: []string{"GET", "HEAD", "POST", "PUT"},
AllowedHeaders: []string{"*"},
})
return c.Handler(h)
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}
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// IgnoreSignatureV2RequestHandler -
// Verify if authorization header has signature version '2', reject it cleanly.
func IgnoreSignatureV2RequestHandler(h http.Handler) http.Handler {
return ignoreSignatureV2RequestHandler{h}
}
// Ignore signature version '2' ServerHTTP() wrapper.
func (h ignoreSignatureV2RequestHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if _, ok := r.Header["Authorization"]; ok {
if !strings.HasPrefix(r.Header.Get("Authorization"), authHeaderPrefix) {
writeErrorResponse(w, r, SignatureVersionNotSupported, r.URL.Path)
return
}
}
h.handler.ServeHTTP(w, r)
}
// IgnoreResourcesHandler -
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// Ignore resources handler is wrapper handler used for API request resource validation
// Since we do not support all the S3 queries, it is necessary for us to throw back a
// valid error message indicating such a feature is not implemented.
func IgnoreResourcesHandler(h http.Handler) http.Handler {
return resourceHandler{h}
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}
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// Resource handler ServeHTTP() wrapper
func (h resourceHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
// Skip the first element which is usally '/' and split the rest.
splits := strings.SplitN(r.URL.Path[1:], "/", 2)
// Save bucketName and objectName extracted from url Path.
var bucketName, objectName string
if len(splits) == 1 {
bucketName = splits[0]
}
if len(splits) == 2 {
bucketName = splits[0]
objectName = splits[1]
}
// If bucketName is present and not objectName check for bucket
// level resource queries.
if bucketName != "" && objectName == "" {
if ignoreNotImplementedBucketResources(r) {
writeErrorResponse(w, r, NotImplemented, r.URL.Path)
return
}
}
// If bucketName and objectName are present check for its resource queries.
if bucketName != "" && objectName != "" {
if ignoreNotImplementedObjectResources(r) {
writeErrorResponse(w, r, NotImplemented, r.URL.Path)
return
}
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}
// A put method on path "/" doesn't make sense, ignore it.
if r.Method == "PUT" && r.URL.Path == "/" {
writeErrorResponse(w, r, NotImplemented, r.URL.Path)
return
}
h.handler.ServeHTTP(w, r)
}
//// helpers
// Checks requests for not implemented Bucket resources
func ignoreNotImplementedBucketResources(req *http.Request) bool {
q := req.URL.Query()
for name := range q {
if notimplementedBucketResourceNames[name] {
return true
}
}
return false
}
// Checks requests for not implemented Object resources
func ignoreNotImplementedObjectResources(req *http.Request) bool {
q := req.URL.Query()
for name := range q {
if notimplementedObjectResourceNames[name] {
return true
}
}
return false
}