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Go
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960package userutil
import ( "regexp" "strings")
var ( handleRegex = 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])?$`) didRegex = regexp.MustCompile(`^did:[a-z]+:[a-zA-Z0-9._:%-]*[a-zA-Z0-9._-]$`))
func IsHandle(s string) bool { // ref: https://atproto.com/specs/handle return handleRegex.MatchString(s)}
// IsDid checks if the given string is a standard DID.func IsDid(s string) bool { return didRegex.MatchString(s)}
func UnflattenDid(s string) string { if !IsFlattenedDid(s) { return s }
return strings.Replace(s, "-", ":", 2)}
// IsFlattenedDid checks if the given string is a flattened DID.func IsFlattenedDid(s string) bool { // Check if the string starts with "did-" if !strings.HasPrefix(s, "did-") { return false }
// Reconstruct as a standard DID format using Replace // Example: "did-plc-xyz-abc" becomes "did:plc:xyz-abc" reconstructed := strings.Replace(s, "-", ":", 2)
return didRegex.MatchString(reconstructed)}
// FlattenDid converts a DID to a flattened format.// A flattened DID is a DID with the :s swapped to -s to satisfy certain// application requirements, such as Go module naming conventions.func FlattenDid(s string) string { if IsDid(s) { return strings.Replace(s, ":", "-", 2) } return s}
var subdomainRegex = regexp.MustCompile(`^[a-z0-9]([a-z0-9-]{2,61}[a-z0-9])?$`)
func IsValidSubdomain(name string) bool { return len(name) >= 4 && len(name) <= 63 && subdomainRegex.MatchString(name)}