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API/CopyObject: Refactor the code and handle if-modified-since as well. (#2183)
This completes the S3 spec behavior for CopyObject API as reported by `s3verify`.
This commit is contained in:
Harshavardhana
GitHub
parent
bef72f26db
commit
e9647b5f12
@ -22,12 +22,104 @@ import (
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"time"
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)
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// Validates the preconditions. Returns true if object content need not be written to http.ResponseWriter.
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func checkPreconditions(r *http.Request, w http.ResponseWriter, objInfo ObjectInfo) bool {
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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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@ -94,12 +186,6 @@ func checkPreconditions(r *http.Request, w http.ResponseWriter, objInfo ObjectIn
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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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if objTime.IsZero() || objTime.Equal(time.Unix(0, 0)) {
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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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return false
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}
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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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@ -124,100 +210,3 @@ func canonicalizeETag(etag string) string {
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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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// checkCopySource implements x-amz-copy-source-if-modified-since and
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// x-amz-copy-source-if-unmodified-since checks.
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//
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// modtime is the modification time of the resource to be served, or
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// IsZero(). return value is whether this request is now complete.
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func checkCopySourceLastModified(w http.ResponseWriter, r *http.Request, modtime time.Time) bool {
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// writer always has quoted string
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// transform reader's etag to
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if r.Method != "PUT" {
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return false
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}
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if modtime.IsZero() || modtime.Equal(time.Unix(0, 0)) {
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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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return false
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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 _, ok := r.Header["x-amz-copy-source-if-modified-since"]; ok {
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// Return the object only if it has been modified since the
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// specified time, otherwise return a 304 error (not modified).
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t, err := time.Parse(http.TimeFormat, r.Header.Get("x-amz-copy-source-if-modified-since"))
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if err == nil && modtime.Before(t.Add(1*time.Second)) {
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h := w.Header()
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// Remove Content headers if set
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delete(h, "Content-Type")
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delete(h, "Content-Length")
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delete(h, "Content-Range")
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w.WriteHeader(http.StatusNotModified)
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return true
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}
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} else if _, ok := r.Header["x-amz-copy-source-if-unmodified-since"]; ok {
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// Return the object only if it has not been modified since the
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// specified time, otherwise return a 412 error (precondition failed).
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t, err := time.Parse(http.TimeFormat, r.Header.Get("x-amz-copy-source-if-unmodified-since"))
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if err == nil && modtime.After(t.Add(1*time.Second)) {
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h := w.Header()
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// Remove Content headers if set
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delete(h, "Content-Type")
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delete(h, "Content-Length")
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delete(h, "Content-Range")
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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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w.Header().Set("Last-Modified", modtime.UTC().Format(http.TimeFormat))
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return false
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}
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// checkCopySourceETag implements x-amz-copy-source-if-match and
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// x-amz-copy-source-if-none-match checks.
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//
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// The ETag must have been previously set in the ResponseWriter's
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// headers. The return value is whether this request is now considered
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// complete.
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func checkCopySourceETag(w http.ResponseWriter, r *http.Request) bool {
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// writer always has quoted string
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// transform reader's etag to
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if r.Method != "PUT" {
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return false
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}
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etag := w.Header().Get("ETag")
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// Tag must be provided...
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if etag == "" {
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return false
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}
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if inm := r.Header.Get("x-amz-copy-source-if-none-match"); inm != "" {
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// Return the object only if its entity tag (ETag) is
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// different from the one specified; otherwise, the
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// request returns a 412 HTTP status code error (failed precondition).
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if isETagEqual(inm, etag) || isETagEqual(inm, "*") {
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h := w.Header()
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// Remove Content headers if set
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delete(h, "Content-Type")
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delete(h, "Content-Length")
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delete(h, "Content-Range")
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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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} else if inm := r.Header.Get("x-amz-copy-source-if-match"); !isETagEqual(inm, "") {
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// Return the object only if its entity tag (ETag) is the same
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// as the one specified; otherwise, return a 412 (precondition failed).
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if !isETagEqual(inm, etag) {
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h := w.Header()
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// Remove Content headers if set
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delete(h, "Content-Type")
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delete(h, "Content-Length")
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delete(h, "Content-Range")
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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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return false
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}
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@ -130,7 +130,7 @@ func (api objectAPIHandlers) GetObjectHandler(w http.ResponseWriter, r *http.Req
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}
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// Validate pre-conditions if any.
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if checkPreconditions(r, w, objInfo) {
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if checkPreconditions(w, r, objInfo) {
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return
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}
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@ -217,7 +217,7 @@ func (api objectAPIHandlers) HeadObjectHandler(w http.ResponseWriter, r *http.Re
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}
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// Validate pre-conditions if any.
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if checkPreconditions(r, w, objInfo) {
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if checkPreconditions(w, r, objInfo) {
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return
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}
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@ -295,21 +295,8 @@ func (api objectAPIHandlers) CopyObjectHandler(w http.ResponseWriter, r *http.Re
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return
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}
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// Verify before writing.
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// Verify x-amz-copy-source-if-modified-since and
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// x-amz-copy-source-if-unmodified-since.
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lastModified := objInfo.ModTime
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if checkCopySourceLastModified(w, r, lastModified) {
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return
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}
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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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// Verify x-amz-copy-source-if-match and x-amz-copy-source-if-none-match.
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if checkCopySourceETag(w, r) {
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// Verify before x-amz-copy-source preconditions before continuing with CopyObject.
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if checkCopyObjectPreconditions(w, r, objInfo) {
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return
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}
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