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https://github.com/makeworld-the-better-one/amfora.git
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103 lines
2.8 KiB
Go
103 lines
2.8 KiB
Go
package client
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// Functions that transform and normalize URLs
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// Originally used to be in display/util.go
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// Moved here for #115, so URLs in the [auth] config section could be normalized
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import (
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"net/url"
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"strings"
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"github.com/makeworld-the-better-one/go-gemini"
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"golang.org/x/text/unicode/norm"
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)
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// See doc for NormalizeURL
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func normalizeURL(u string) (*url.URL, string) {
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u = norm.NFC.String(u)
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tmp, err := gemini.GetPunycodeURL(u)
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if err != nil {
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return nil, u
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}
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u = tmp
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parsed, _ := url.Parse(u)
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if parsed.Scheme == "" {
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// Always add scheme
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parsed.Scheme = "gemini"
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} else if parsed.Scheme != "gemini" {
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// Not a gemini URL, nothing to do
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return nil, u
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}
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parsed.User = nil // No passwords in Gemini
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parsed.Fragment = "" // No fragments either
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if parsed.Port() == "1965" {
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// Always remove default port
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hostname := parsed.Hostname()
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if strings.Contains(hostname, ":") {
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parsed.Host = "[" + parsed.Hostname() + "]"
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} else {
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parsed.Host = parsed.Hostname()
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}
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}
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// Add slash to the end of a URL with just a domain
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// gemini://example.com -> gemini://example.com/
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if parsed.Path == "" {
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parsed.Path = "/"
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} else {
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// Decode and re-encode path
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// This removes needless encoding, like that of ASCII chars
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// And encodes anything that wasn't but should've been
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parsed.RawPath = strings.ReplaceAll(url.PathEscape(parsed.Path), "%2F", "/")
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}
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// Do the same to the query string
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un, err := gemini.QueryUnescape(parsed.RawQuery)
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if err == nil {
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parsed.RawQuery = gemini.QueryEscape(un)
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}
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return parsed, ""
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}
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// NormalizeURL attempts to make URLs that are different strings
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// but point to the same place all look the same.
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//
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// Example: gemini://gus.guru:1965/ and //gus.guru/.
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// This function will take both output the same URL each time.
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//
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// It will also percent-encode invalid characters, and decode chars
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// that don't need to be encoded. It will also apply Unicode NFC
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// normalization.
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//
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// The string passed must already be confirmed to be a URL.
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// Detection of a search string vs. a URL must happen elsewhere.
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//
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// It only works with absolute URLs.
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func NormalizeURL(u string) string {
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pu, s := normalizeURL(u)
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if pu != nil {
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// Could be normalized, return it
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return pu.String()
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}
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// Return the best URL available up to that point
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return s
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}
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// FixUserURL will take a user-typed URL and add a gemini scheme to it if
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// necessary. It is not the same as normalizeURL, and that func should still
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// be used, afterward.
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//
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// For example "example.com" will become "gemini://example.com", but
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// "//example.com" will be left untouched.
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func FixUserURL(u string) string {
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if !strings.HasPrefix(u, "//") && !strings.HasPrefix(u, "gemini://") && !strings.Contains(u, "://") {
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// Assume it's a Gemini URL
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u = "gemini://" + u
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}
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return u
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}
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