mirror of https://github.com/miniflux/v2.git
132 lines
2.8 KiB
Go
132 lines
2.8 KiB
Go
// Copyright 2017 Frédéric Guillot. All rights reserved.
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// Use of this source code is governed by the Apache 2.0
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// license that can be found in the LICENSE file.
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package url // import "miniflux.app/url"
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import (
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"fmt"
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"net/url"
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"sort"
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"strings"
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)
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// IsAbsoluteURL returns true if the link is absolute.
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func IsAbsoluteURL(link string) bool {
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u, err := url.Parse(link)
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if err != nil {
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return false
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}
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return u.IsAbs()
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}
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// AbsoluteURL converts the input URL as absolute URL if necessary.
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func AbsoluteURL(baseURL, input string) (string, error) {
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if strings.HasPrefix(input, "//") {
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input = "https://" + input[2:]
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}
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u, err := url.Parse(input)
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if err != nil {
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return "", fmt.Errorf("unable to parse input URL: %v", err)
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}
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if u.IsAbs() {
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return u.String(), nil
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}
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base, err := url.Parse(baseURL)
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if err != nil {
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return "", fmt.Errorf("unable to parse base URL: %v", err)
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}
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return base.ResolveReference(u).String(), nil
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}
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// RootURL returns absolute URL without the path.
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func RootURL(websiteURL string) string {
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if strings.HasPrefix(websiteURL, "//") {
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websiteURL = "https://" + websiteURL[2:]
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}
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absoluteURL, err := AbsoluteURL(websiteURL, "")
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if err != nil {
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return websiteURL
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}
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u, err := url.Parse(absoluteURL)
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if err != nil {
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return absoluteURL
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}
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return u.Scheme + "://" + u.Host + "/"
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}
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// IsHTTPS returns true if the URL is using HTTPS.
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func IsHTTPS(websiteURL string) bool {
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parsedURL, err := url.Parse(websiteURL)
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if err != nil {
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return false
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}
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return strings.ToLower(parsedURL.Scheme) == "https"
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}
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// Domain returns only the domain part of the given URL.
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func Domain(websiteURL string) string {
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parsedURL, err := url.Parse(websiteURL)
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if err != nil {
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return websiteURL
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}
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return parsedURL.Host
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}
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// RequestURI returns the encoded URI to be used in HTTP requests.
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func RequestURI(websiteURL string) string {
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u, err := url.Parse(websiteURL)
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if err != nil {
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return websiteURL
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}
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queryValues := u.Query()
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u.RawQuery = "" // Clear RawQuery to make sure it's encoded properly.
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u.Fragment = "" // Clear fragment because Web browsers strip #fragment before sending the URL to a web server.
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var buf strings.Builder
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buf.WriteString(u.String())
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if len(queryValues) > 0 {
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buf.WriteByte('?')
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// Sort keys.
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keys := make([]string, 0, len(queryValues))
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for k := range queryValues {
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keys = append(keys, k)
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}
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sort.Strings(keys)
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i := 0
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for _, key := range keys {
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keyEscaped := url.QueryEscape(key)
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values := queryValues[key]
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for _, value := range values {
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if i > 0 {
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buf.WriteByte('&')
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}
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buf.WriteString(keyEscaped)
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// As opposed to the standard library, we append the = only if the value is not empty.
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if value != "" {
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buf.WriteByte('=')
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buf.WriteString(url.QueryEscape(value))
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}
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i++
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}
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}
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}
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return buf.String()
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}
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