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miniflux/url/url.go

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// Copyright 2017 Frédéric Guillot. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.
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package url // import "miniflux.app/url"
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import (
"fmt"
"net/url"
"strings"
)
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// IsAbsoluteURL returns true if the link is absolute.
func IsAbsoluteURL(link string) bool {
u, err := url.Parse(link)
if err != nil {
return false
}
return u.IsAbs()
}
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// AbsoluteURL converts the input URL as absolute URL if necessary.
func AbsoluteURL(baseURL, input string) (string, error) {
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if strings.HasPrefix(input, "//") {
input = "https://" + input[2:]
}
u, err := url.Parse(input)
if err != nil {
return "", fmt.Errorf("unable to parse input URL: %v", err)
}
if u.IsAbs() {
return u.String(), nil
}
base, err := url.Parse(baseURL)
if err != nil {
return "", fmt.Errorf("unable to parse base URL: %v", err)
}
return base.ResolveReference(u).String(), nil
}
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// RootURL returns absolute URL without the path.
func RootURL(websiteURL string) string {
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if strings.HasPrefix(websiteURL, "//") {
websiteURL = "https://" + websiteURL[2:]
}
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absoluteURL, err := AbsoluteURL(websiteURL, "")
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if err != nil {
return websiteURL
}
u, err := url.Parse(absoluteURL)
if err != nil {
return absoluteURL
}
return u.Scheme + "://" + u.Host + "/"
}
// IsHTTPS returns true if the URL is using HTTPS.
func IsHTTPS(websiteURL string) bool {
parsedURL, err := url.Parse(websiteURL)
if err != nil {
return false
}
return strings.ToLower(parsedURL.Scheme) == "https"
}
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// Domain returns only the domain part of the given URL.
func Domain(websiteURL string) string {
parsedURL, err := url.Parse(websiteURL)
if err != nil {
return websiteURL
}
return parsedURL.Host
}