94 lines
2 KiB
Go
94 lines
2 KiB
Go
package links
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import (
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"net/url"
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"strings"
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)
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const DefaultPublicBaseURL = "https://telesrv.net"
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const MaxChatlistSlugBytes = 128
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func NormalizeBaseURL(raw string) string {
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raw = strings.TrimSpace(raw)
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if raw == "" {
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raw = DefaultPublicBaseURL
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}
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if !strings.Contains(raw, "://") {
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raw = "https://" + raw
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}
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return strings.TrimRight(raw, "/")
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}
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func Build(baseURL, path string, query url.Values) string {
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baseURL = NormalizeBaseURL(baseURL)
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parsed, err := url.Parse(baseURL)
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if err != nil || parsed.Scheme == "" || parsed.Host == "" {
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baseURL = DefaultPublicBaseURL
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parsed, _ = url.Parse(baseURL)
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}
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basePath := strings.TrimRight(parsed.Path, "/")
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path = strings.TrimLeft(path, "/")
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if path != "" {
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parsed.Path = basePath + "/" + path
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} else if basePath != "" {
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parsed.Path = basePath
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}
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parsed.RawQuery = query.Encode()
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return parsed.String()
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}
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func Host(baseURL string) string {
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parsed, err := url.Parse(NormalizeBaseURL(baseURL))
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if err != nil || parsed.Host == "" {
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return "telesrv.net"
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}
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if host := parsed.Hostname(); host != "" {
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return host
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}
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return parsed.Host
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}
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func CleanChatlistSlug(raw string) string {
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raw = strings.TrimSpace(raw)
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if raw == "" {
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return ""
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}
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if strings.Contains(raw, "://") {
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if parsed, err := url.Parse(raw); err == nil {
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if slug := parsed.Query().Get("slug"); slug != "" {
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raw = slug
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} else {
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raw = strings.Trim(parsed.Path, "/")
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}
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}
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}
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raw = strings.TrimPrefix(raw, "addlist/")
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raw = strings.Trim(raw, "/")
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if idx := strings.LastIndex(raw, "/"); idx >= 0 {
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raw = raw[idx+1:]
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}
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if idx := strings.IndexAny(raw, "?#"); idx >= 0 {
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raw = raw[:idx]
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}
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if decoded, err := url.PathUnescape(raw); err == nil {
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raw = decoded
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}
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return raw
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}
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func ValidChatlistSlug(slug string) bool {
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if slug == "" || len(slug) > MaxChatlistSlugBytes {
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return false
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}
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for _, r := range slug {
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switch {
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case r >= 'a' && r <= 'z':
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case r >= 'A' && r <= 'Z':
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case r >= '0' && r <= '9':
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case r == '_' || r == '-' || r == '.':
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default:
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return false
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}
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}
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return true
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}
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