Files
rclone/backend/doi/link_header.go
Flora Thiebaut 3b3096c940 doi: add new doi backend
Add a new backend to support mounting datasets published with a digital
object identifier (DOI).
2025-06-05 16:40:54 +01:00

76 lines
1.5 KiB
Go

package doi
import (
"regexp"
"strings"
)
var linkRegex = regexp.MustCompile(`^<(.+)>$`)
var valueRegex = regexp.MustCompile(`^"(.+)"$`)
// headerLink represents a link as presented in HTTP headers
// MDN Reference: https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Link
type headerLink struct {
Href string
Rel string
Type string
Extras map[string]string
}
func parseLinkHeader(header string) (links []headerLink) {
for _, link := range strings.Split(header, ",") {
link = strings.TrimSpace(link)
parsed := parseLink(link)
if parsed != nil {
links = append(links, *parsed)
}
}
return links
}
func parseLink(link string) (parsedLink *headerLink) {
var parts []string
for _, part := range strings.Split(link, ";") {
parts = append(parts, strings.TrimSpace(part))
}
match := linkRegex.FindStringSubmatch(parts[0])
if match == nil {
return nil
}
result := &headerLink{
Href: match[1],
Extras: map[string]string{},
}
for _, keyValue := range parts[1:] {
parsed := parseKeyValue(keyValue)
if parsed != nil {
key, value := parsed[0], parsed[1]
switch strings.ToLower(key) {
case "rel":
result.Rel = value
case "type":
result.Type = value
default:
result.Extras[key] = value
}
}
}
return result
}
func parseKeyValue(keyValue string) []string {
parts := strings.SplitN(keyValue, "=", 2)
if parts[0] == "" || len(parts) < 2 {
return nil
}
match := valueRegex.FindStringSubmatch(parts[1])
if match != nil {
parts[1] = match[1]
return parts
}
return parts
}