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// SPDX-FileCopyrightText: Copyright The Miniflux Authors. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
package urllib // import "miniflux.app/v2/internal/urllib"
import (
"fmt"
"net/url"
"strings"
)
// 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()
}
// AbsoluteURL converts the input URL as absolute URL if necessary.
func AbsoluteURL(baseURL, input string) (string, error) {
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
}
// RootURL returns absolute URL without the path.
func RootURL(websiteURL string) string {
if strings.HasPrefix(websiteURL, "//") {
websiteURL = "https://" + websiteURL[2:]
}
absoluteURL, err := AbsoluteURL(websiteURL, "")
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"
}
// 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
}
// JoinBaseURLAndPath returns a URL string with the provided path elements joined together.
func JoinBaseURLAndPath(baseURL, path string) (string, error) {
if baseURL == "" {
return "", fmt.Errorf("empty base URL")
}
if path == "" {
return "", fmt.Errorf("empty path")
}
_, err := url.Parse(baseURL)
if err != nil {
return "", fmt.Errorf("invalid base URL: %w", err)
}
finalURL, err := url.JoinPath(baseURL, path)
if err != nil {
return "", fmt.Errorf("unable to join base URL %s and path %s: %w", baseURL, path, err)
}
return finalURL, nil
}
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