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88 lines
2.1 KiB
88 lines
2.1 KiB
/*
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Copyright The Helm Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package urlutil
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import (
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"net/url"
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"path"
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"path/filepath"
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"strings"
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)
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// URLJoin joins a base URL to one or more path components.
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//
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// It's like filepath.Join for URLs. If the baseURL is pathish, this will still
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// perform a join.
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//
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// If the URL is unparsable, this returns an error.
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func URLJoin(baseURL string, paths ...string) (string, error) {
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u, err := url.Parse(baseURL)
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if err != nil {
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return "", err
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}
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// We want path instead of filepath because path always uses /.
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all := []string{u.Path}
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all = append(all, paths...)
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u.Path = path.Join(all...)
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return u.String(), nil
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}
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// Equal normalizes two URLs and then compares for equality.
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func Equal(a, b string) bool {
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au, err := url.Parse(a)
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if err != nil {
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a = filepath.Clean(a)
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b = filepath.Clean(b)
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// If urls are paths, return true only if they are an exact match
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return a == b
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}
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bu, err := url.Parse(b)
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if err != nil {
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return false
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}
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for _, u := range []*url.URL{au, bu} {
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if u.Path == "" {
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u.Path = "/"
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}
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u.Path = filepath.Clean(u.Path)
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}
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return au.String() == bu.String()
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}
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// ExtractHostname returns hostname from URL
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func ExtractHostname(addr string) (string, error) {
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u, err := url.Parse(addr)
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if err != nil {
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return "", err
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}
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return stripPort(u.Host), nil
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}
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// stripPort from Go 1.8 because Circle is still on 1.7
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func stripPort(hostport string) string {
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colon := strings.IndexByte(hostport, ':')
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if colon == -1 {
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return hostport
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}
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if i := strings.IndexByte(hostport, ']'); i != -1 {
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return strings.TrimPrefix(hostport[:i], "[")
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}
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return hostport[:colon]
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}
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