this repo has no description
tangled.org
1package userutil
2
3import (
4 "regexp"
5 "strings"
6)
7
8func IsHandleNoAt(s string) bool {
9 // ref: https://atproto.com/specs/handle
10 re := regexp.MustCompile(`^([a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?$`)
11 return re.MatchString(s)
12}
13
14func UnflattenDid(s string) string {
15 if !IsFlattenedDid(s) {
16 return s
17 }
18
19 parts := strings.SplitN(s[4:], "-", 2) // Skip "did-" prefix and split on first "-"
20 if len(parts) != 2 {
21 return s
22 }
23
24 return "did:" + parts[0] + ":" + parts[1]
25}
26
27// IsFlattenedDid checks if the given string is a flattened DID.
28func IsFlattenedDid(s string) bool {
29 // Check if the string starts with "did-"
30 if !strings.HasPrefix(s, "did-") {
31 return false
32 }
33
34 // Split the string to extract method and identifier
35 parts := strings.SplitN(s[4:], "-", 2) // Skip "did-" prefix and split on first "-"
36 if len(parts) != 2 {
37 return false
38 }
39
40 // Reconstruct as a standard DID format
41 // Example: "did-plc-xyz-abc" becomes "did:plc:xyz-abc"
42 reconstructed := "did:" + parts[0] + ":" + parts[1]
43 re := regexp.MustCompile(`^did:[a-z]+:[a-zA-Z0-9._:%-]*[a-zA-Z0-9._-]$`)
44
45 return re.MatchString(reconstructed)
46}
47
48// FlattenDid converts a DID to a flattened format.
49// A flattened DID is a DID with the :s swapped to -s to satisfy certain
50// application requirements, such as Go module naming conventions.
51func FlattenDid(s string) string {
52 if !IsFlattenedDid(s) {
53 return s
54 }
55
56 parts := strings.SplitN(s[4:], ":", 2) // Skip "did:" prefix and split on first ":"
57 if len(parts) != 2 {
58 return s
59 }
60
61 return "did-" + parts[0] + "-" + parts[1]
62}