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Free per-user homepages at <name>.<host> (wildcard subdomains)

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- sites.AskHandler now approves <name>.AGENTBBS_HOST on-demand-TLS when <name>
  is a registered member (so only real users mint subdomain certs).
- Caddyfile: *.${DOMAIN} block serving users/<name>/public_html with on_demand
  TLS; unknown users 404. Needs a wildcard DNS record *.${DOMAIN} -> host.
- Test: TestAskUserSubdomain.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Anthony Ettinger 2026-06-14 09:20:34 +00:00
parent 74c292f341
commit ae8b1c25f4
3 changed files with 73 additions and 0 deletions
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16
internal/sites/sites.go
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@ -48,6 +48,7 @@ type Manager struct {
st store.Store
usersDir string // <data>/users
domDir string // <data>/domains (the symlink farm Caddy serves)
baseHost string // AGENTBBS_HOST, e.g. bbs.profullstack.com (for <name>.<host>)
}
// NewManager prepares the symlink farm under dataDir/domains.
@ -60,6 +61,7 @@ func NewManager(st store.Store, dataDir string) (*Manager, error) {
st: st,
usersDir: filepath.Join(dataDir, "users"),
domDir: domDir,
baseHost: strings.ToLower(strings.TrimSpace(os.Getenv("AGENTBBS_HOST"))),
}, nil
}
@ -132,6 +134,20 @@ func (m *Manager) AskHandler() http.Handler {
http.Error(w, "bad domain", http.StatusBadRequest)
return
}
// Free user-homepage subdomain: <name>.<baseHost> for any registered
// member (e.g. alice.bbs.profullstack.com). Single label only.
if m.baseHost != "" && strings.HasSuffix(d, "."+m.baseHost) {
label := strings.TrimSuffix(d, "."+m.baseHost)
if label != "" && !strings.Contains(label, ".") {
if _, ok, err := m.st.UserByName(label); err != nil {
http.Error(w, "lookup error", http.StatusInternalServerError)
return
} else if ok {
w.WriteHeader(http.StatusOK)
return
}
}
}
if _, ok, err := m.st.DomainUser(d); err != nil {
http.Error(w, "lookup error", http.StatusInternalServerError)
return