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name.go
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name.go
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// Copyright 2017 Google Inc. All Rights Reserved.
//
// 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 quotaapi
import (
"fmt"
"regexp"
"strconv"
"strings"
)
const (
collectionTrees = "trees"
wildcard = "-"
)
var (
// globalRE is a regex for quotas/global/ name filters.
// Wildcards ("-") are not allowed to replace "global". They could be allowed, but it's a query
// that doesn't make much sense, as if this format is used it has to be a global quota query.
globalRE *regexp.Regexp
// treeUsersRE is a broader regex for all trees/ and users/ name filters.
// It doesn't guard against the following specific situations:
// 1. quotas/trees/<id>/<kind>/config where id is not an int64
// 2. quotas/-/<id>/<kind>/config where id != "-", which is a possibly ambiguous query. It could
// be allowed, but since the ID being queried is already known, so is the collection, so it
// doesn't make much sense.
treesUsersRE *regexp.Regexp
)
func init() {
var err error
globalRE, err = regexp.Compile("^quotas/global/(-|read|write)/config$")
if err != nil {
panic(fmt.Sprintf("globalRE: %v", err))
}
treesUsersRE, err = regexp.Compile("^quotas/(-|trees|users)/[^/]+/(-|read|write)/config$")
if err != nil {
panic(fmt.Sprintf("treesUsersRE: %v", err))
}
}
// nameFilter represents a config name filter, as used by ListConfigs.
//
// A name filter is internally represented as the segments of the name, ie, the result of
// strings.Split(name, "/").
//
// A few examples are:
// * ["quotas", "global", "read", "configs"]
// * ["quotas", "trees", "12345", "write", "config"]
type nameFilter []string
func newNameFilter(name string) (nameFilter, error) {
if !globalRE.MatchString(name) && !treesUsersRE.MatchString(name) {
return nil, fmt.Errorf("invalid name filter: %q", name)
}
nf := strings.Split(string(name), "/")
// Guard against some ambiguous / incorrect wildcards that the regexes won't protect against
switch collection := nf[1]; collection {
case collectionTrees:
id := nf[2]
if id == wildcard {
break
}
// treeID must be an int64
if _, err := strconv.ParseInt(id, 10, 64); err != nil {
return nil, fmt.Errorf("invalid name filter: %q, ID %q is not a valid 64-bit integer", name, id)
}
case wildcard:
id := nf[2]
if id != wildcard {
return nil, fmt.Errorf("invalid name filter: %q, ambiguous ID %q received", name, id)
}
}
return nf, nil
}
func (nf nameFilter) matches(path string) bool {
segments := strings.Split(path, "/")
l := len(nf)
if l != len(segments) {
return false
}
// Skip first and last tokens (they're always "quotas" and "config").
for i := 1; i < l-1; i++ {
if nf[i] != wildcard && nf[i] != segments[i] {
return false
}
}
return true
}