trim prefix: list-objects; bucket-summary; multi-obj operations

* rtrim(prefix, '*') to satisfy one common expectation
* proxy only; leaving rest of the code and CLI intact

Signed-off-by: Alex Aizman <alex.aizman@gmail.com>

ais/proxy.go

@@ -632,6 +632,7 @@ func (p *proxy) httpbckget(w http.ResponseWriter, r *http.Request, dpq *dpq) {
 			p.writeErrf(w, r, cmn.FmtErrMorphUnmarshal, p.si, msg.Action, msg.Value, err)
 			return
 		}
+		summMsg.Prefix = cos.TrimPrefix(summMsg.Prefix)
 		if qbck.IsBucket() {
 			bck := (*meta.Bck)(qbck)
 			bckArgs := bctx{p: p, w: w, r: r, msg: msg, perms: apc.AceBckHEAD, bck: bck, dpq: dpq}
@@ -685,6 +686,7 @@ func (p *proxy) httpbckget(w http.ResponseWriter, r *http.Request, dpq *dpq) {
 		p.writeErrf(w, r, cmn.FmtErrMorphUnmarshal, p.si, msg.Action, msg.Value, err)
 		return
 	}
+	lsmsg.Prefix = cos.TrimPrefix(lsmsg.Prefix)
 	if err := cmn.ValidatePrefix("bad list-objects request", lsmsg.Prefix); err != nil {
 		p.statsT.IncErr(stats.ErrListCount)
 		p.writeErr(w, r, err)
@@ -1348,6 +1350,7 @@ func (p *proxy) _bckpost(w http.ResponseWriter, r *http.Request, msg *apc.ActMsg
 			p.writeErr(w, r, err)
 			return
 		}
+		tcbmsg.Prefix = cos.TrimPrefix(tcbmsg.Prefix)
 		if bckFrom.Equal(bckTo, true, true) {
 			if !bckFrom.IsRemote() {
 				p.writeErrf(w, r, "cannot %s bucket %q onto itself", msg.Action, bckFrom)
@@ -1408,6 +1411,7 @@ func (p *proxy) _bckpost(w http.ResponseWriter, r *http.Request, msg *apc.ActMsg
 			p.writeErrf(w, r, errPrependSync, tcomsg.Prepend)
 			return
 		}
+		tcomsg.Prefix = cos.TrimPrefix(tcomsg.Prefix)
 		bckTo = meta.CloneBck(&tcomsg.ToBck)
 
 		if bck.Equal(bckTo, true, true) {
@@ -1932,6 +1936,7 @@ func (p *proxy) httpbckhead(w http.ResponseWriter, r *http.Request, apireq *apiR
 			for _, s := range items[2:] {
 				prefix += "/" + s
 			}
+			prefix = cos.TrimPrefix(prefix)
 			apireq.after = 2
 		}
 	}

cmn/cos/strings.go

@@ -36,6 +36,17 @@ func TrimLastB(s string, b byte) string {
 	return s
 }
 
+// [NOTE] common *nix expectation in re: `ls aaa/bbb*` and similar
+// - `?` not supported
+// - `\*` not supported
+// see also: cmn.ObjHasPrefix and friends
+func TrimPrefix(s string) string {
+	if l := len(s); l > 0 && s[l-1] == WildcardMatchAll[0] {
+		return s[:l-1]
+	}
+	return s
+}
+
 // left if non-empty; otherwise right
 func Left(left, right string) string {
 	if left != "" {

cmn/cos/template.go

@@ -102,7 +102,7 @@ func NewParsedTemplate(template string) (parsed ParsedTemplate, err error) {
 	}
 
 	// "pure" prefix w/ no ranges
-	return ParsedTemplate{Prefix: template}, nil
+	return ParsedTemplate{Prefix: TrimPrefix(template)}, nil
 }
 
 func (pt *ParsedTemplate) Clone() *ParsedTemplate {

cmn/objlist_utils.go

@@ -219,14 +219,16 @@ func MergeLso(lists []*LsoRes, lsmsg *apc.LsoMsg, maxSize int) *LsoRes {
 // already listed and must be skipped). Note that string `>=` is lexicographic.
 func TokenGreaterEQ(token, objName string) bool { return token >= objName }
 
-// Directory has to either:
+// directory has to either:
 // - include (or match) prefix, or
 // - be contained in prefix - motivation: don't SkipDir a/b when looking for a/b/c
-// An alternative name for this function could be smth. like SameBranch()
+// an alternative name for this function could be smth. like SameBranch()
+// see also: cos.TrimPrefix
 func DirHasOrIsPrefix(dirPath, prefix string) bool {
 	return prefix == "" || (strings.HasPrefix(prefix, dirPath) || strings.HasPrefix(dirPath, prefix))
 }
 
+// see also: cos.TrimPrefix
 func ObjHasPrefix(objName, prefix string) bool {
 	return prefix == "" || strings.HasPrefix(objName, prefix)
 }