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// Copyright 2016 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 martianurl
// MatchHost matches two URL hosts with support for wildcards.
func MatchHost(host, match string) bool {
// Short circuit if host is empty.
if host == "" {
return false
}
// Exact match, no need to loop.
if host == match {
return true
}
// Walk backward over the host.
hi := len(host) - 1
for mi := len(match) - 1; mi >= 0; mi-- {
// Found wildcard, skip to next period.
if match[mi] == '*' {
for hi > 0 && host[hi] != '.' {
hi--
}
// Wildcard was the leftmost part and we have walked the entire host,
// success.
if mi == 0 && hi == 0 {
return true
}
continue
}
if host[hi] != match[mi] {
return false
}
// We have walked the entire host, if we have not walked the entire matcher
// (mi != 0) that means the matcher has remaining characters to match and
// thus the host cannot match.
if hi == 0 {
return mi == 0
}
hi--
}
// We have walked the entire length of the matcher, but haven't finished
// walking the host thus they cannot match.
return false
}
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