37 lines
1.3 KiB
Go
37 lines
1.3 KiB
Go
// Copyright 2020-2026 The happyDomain Authors
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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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package checker
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import "strings"
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// JoinRelative treats name as relative to origin, as happyDomain encodes
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// service-embedded record owners and subdomains. An empty or "@" name
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// resolves to the origin itself; an empty origin returns the trimmed name
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// unchanged. A name already suffixed by origin is returned as-is so that
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// absolute encodings round-trip safely. Trailing dots are stripped.
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func JoinRelative(name, origin string) string {
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origin = strings.TrimSuffix(origin, ".")
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name = strings.TrimSuffix(name, ".")
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if origin == "" {
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return name
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}
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if name == "" || name == "@" {
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return origin
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}
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if name == origin || strings.HasSuffix(name, "."+origin) {
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return name
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}
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return name + "." + origin
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}
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