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server: Move all the top level files into cmd folder. (#2490)
This change brings a change which was done for the 'mc' package to allow for clean repo and have a cleaner github drop in experience.
This commit is contained in:
Harshavardhana
committed by
Anand Babu (AB) Periasamy
Anand Babu (AB) Periasamy
parent
73d1a46f3e
commit
bccf549463
212
cmd/object-handlers-common.go
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212
cmd/object-handlers-common.go
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@@ -0,0 +1,212 @@
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/*
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* Minio Cloud Storage, (C) 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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"strings"
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"time"
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)
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// Validates the preconditions for CopyObject, returns true if CopyObject operation should not proceed.
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// Preconditions supported are:
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// x-amz-copy-source-if-modified-since
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// x-amz-copy-source-if-unmodified-since
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// x-amz-copy-source-if-match
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// x-amz-copy-source-if-none-match
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func checkCopyObjectPreconditions(w http.ResponseWriter, r *http.Request, objInfo ObjectInfo) bool {
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// Return false for methods other than GET and HEAD.
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if r.Method != "PUT" {
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return false
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}
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// If the object doesn't have a modtime (IsZero), or the modtime
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// is obviously garbage (Unix time == 0), then ignore modtimes
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// and don't process the If-Modified-Since header.
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if objInfo.ModTime.IsZero() || objInfo.ModTime.Equal(time.Unix(0, 0)) {
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return false
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}
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// Headers to be set of object content is not going to be written to the client.
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writeHeaders := func() {
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// set common headers
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setCommonHeaders(w)
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// set object-related metadata headers
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w.Header().Set("Last-Modified", objInfo.ModTime.UTC().Format(http.TimeFormat))
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if objInfo.MD5Sum != "" {
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w.Header().Set("ETag", "\""+objInfo.MD5Sum+"\"")
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}
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}
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// x-amz-copy-source-if-modified-since: Return the object only if it has been modified
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// since the specified time otherwise return 412 (precondition failed).
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ifModifiedSinceHeader := r.Header.Get("x-amz-copy-source-if-modified-since")
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if ifModifiedSinceHeader != "" {
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if !ifModifiedSince(objInfo.ModTime, ifModifiedSinceHeader) {
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// If the object is not modified since the specified time.
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writeHeaders()
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writeErrorResponse(w, r, ErrPreconditionFailed, r.URL.Path)
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return true
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}
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}
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// x-amz-copy-source-if-unmodified-since : Return the object only if it has not been
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// modified since the specified time, otherwise return a 412 (precondition failed).
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ifUnmodifiedSinceHeader := r.Header.Get("x-amz-copy-source-if-unmodified-since")
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if ifUnmodifiedSinceHeader != "" {
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if ifModifiedSince(objInfo.ModTime, ifUnmodifiedSinceHeader) {
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// If the object is modified since the specified time.
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writeHeaders()
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writeErrorResponse(w, r, ErrPreconditionFailed, r.URL.Path)
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return true
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}
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}
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// x-amz-copy-source-if-match : Return the object only if its entity tag (ETag) is the
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// same as the one specified; otherwise return a 412 (precondition failed).
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ifMatchETagHeader := r.Header.Get("x-amz-copy-source-if-match")
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if ifMatchETagHeader != "" {
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if !isETagEqual(objInfo.MD5Sum, ifMatchETagHeader) {
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// If the object ETag does not match with the specified ETag.
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writeHeaders()
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writeErrorResponse(w, r, ErrPreconditionFailed, r.URL.Path)
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return true
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}
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}
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// If-None-Match : Return the object only if its entity tag (ETag) is different from the
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// one specified otherwise, return a 304 (not modified).
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ifNoneMatchETagHeader := r.Header.Get("x-amz-copy-source-if-none-match")
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if ifNoneMatchETagHeader != "" {
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if isETagEqual(objInfo.MD5Sum, ifNoneMatchETagHeader) {
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// If the object ETag matches with the specified ETag.
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writeHeaders()
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writeErrorResponse(w, r, ErrPreconditionFailed, r.URL.Path)
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return true
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}
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}
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// Object content should be written to http.ResponseWriter
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return false
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}
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// Validates the preconditions. Returns true if GET/HEAD operation should not proceed.
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// Preconditions supported are:
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// If-Modified-Since
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// If-Unmodified-Since
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// If-Match
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// If-None-Match
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func checkPreconditions(w http.ResponseWriter, r *http.Request, objInfo ObjectInfo) bool {
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// Return false for methods other than GET and HEAD.
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if r.Method != "GET" && r.Method != "HEAD" {
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return false
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}
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// If the object doesn't have a modtime (IsZero), or the modtime
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// is obviously garbage (Unix time == 0), then ignore modtimes
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// and don't process the If-Modified-Since header.
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if objInfo.ModTime.IsZero() || objInfo.ModTime.Equal(time.Unix(0, 0)) {
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return false
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}
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// Headers to be set of object content is not going to be written to the client.
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writeHeaders := func() {
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// set common headers
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setCommonHeaders(w)
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// set object-related metadata headers
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w.Header().Set("Last-Modified", objInfo.ModTime.UTC().Format(http.TimeFormat))
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if objInfo.MD5Sum != "" {
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w.Header().Set("ETag", "\""+objInfo.MD5Sum+"\"")
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}
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}
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// If-Modified-Since : Return the object only if it has been modified since the specified time,
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// otherwise return a 304 (not modified).
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ifModifiedSinceHeader := r.Header.Get("If-Modified-Since")
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if ifModifiedSinceHeader != "" {
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if !ifModifiedSince(objInfo.ModTime, ifModifiedSinceHeader) {
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// If the object is not modified since the specified time.
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writeHeaders()
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w.WriteHeader(http.StatusNotModified)
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return true
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}
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}
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// If-Unmodified-Since : Return the object only if it has not been modified since the specified
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// time, otherwise return a 412 (precondition failed).
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ifUnmodifiedSinceHeader := r.Header.Get("If-Unmodified-Since")
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if ifUnmodifiedSinceHeader != "" {
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if ifModifiedSince(objInfo.ModTime, ifUnmodifiedSinceHeader) {
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// If the object is modified since the specified time.
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writeHeaders()
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writeErrorResponse(w, r, ErrPreconditionFailed, r.URL.Path)
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return true
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}
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}
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// If-Match : Return the object only if its entity tag (ETag) is the same as the one specified;
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// otherwise return a 412 (precondition failed).
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ifMatchETagHeader := r.Header.Get("If-Match")
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if ifMatchETagHeader != "" {
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if !isETagEqual(objInfo.MD5Sum, ifMatchETagHeader) {
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// If the object ETag does not match with the specified ETag.
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writeHeaders()
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writeErrorResponse(w, r, ErrPreconditionFailed, r.URL.Path)
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return true
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}
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}
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// If-None-Match : Return the object only if its entity tag (ETag) is different from the
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// one specified otherwise, return a 304 (not modified).
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ifNoneMatchETagHeader := r.Header.Get("If-None-Match")
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if ifNoneMatchETagHeader != "" {
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if isETagEqual(objInfo.MD5Sum, ifNoneMatchETagHeader) {
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// If the object ETag matches with the specified ETag.
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writeHeaders()
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w.WriteHeader(http.StatusNotModified)
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return true
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}
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}
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// Object content should be written to http.ResponseWriter
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return false
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}
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// returns true if object was modified after givenTime.
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func ifModifiedSince(objTime time.Time, givenTimeStr string) bool {
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givenTime, err := time.Parse(http.TimeFormat, givenTimeStr)
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if err != nil {
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return true
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}
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// The Date-Modified header truncates sub-second precision, so
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// use mtime < t+1s instead of mtime <= t to check for unmodified.
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if objTime.After(givenTime.Add(1 * time.Second)) {
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return true
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}
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return false
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}
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// canonicalizeETag returns ETag with leading and trailing double-quotes removed,
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// if any present
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func canonicalizeETag(etag string) string {
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canonicalETag := strings.TrimPrefix(etag, "\"")
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return strings.TrimSuffix(canonicalETag, "\"")
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}
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// isETagEqual return true if the canonical representations of two ETag strings
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// are equal, false otherwise
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func isETagEqual(left, right string) bool {
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return canonicalizeETag(left) == canonicalizeETag(right)
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}
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