[management] Rework Agent Network endpoint identity and settings bootstrap (#7085)

Store the per-account gateway endpoint as {domain, proxy_address} with a
global unique index on the full hostname; dedicated = (domain ==
proxy_address). Bootstrap becomes an explicit POST carrying exactly one
of proxy_address (server allocates an adjective-noun label beneath it)
or endpoint (claimed verbatim, address-first); provider create loses its
bootstrap side effect. PUT is a full replace with every field required —
the immutable identity fields must be echoed unchanged and a mismatch is
rejected with 422. A guarded DELETE releases the endpoint: refused with
412 while providers exist or a proxy is actively serving the endpoint
hostname (matched case-insensitively); re-creating bootstraps fresh. A
self-addressed pin excludes its address from the account's cluster allow
list, and the live mapping update path now addresses the serving proxy
from the synthesized service. Existing rows are migrated on all three
store engines.

management/internals/modules/agentnetwork/handlers/settings_handler.go

@@ -12,13 +12,55 @@ import (
 	"github.com/netbirdio/netbird/shared/management/http/util"
 )
 
-// addSettingsEndpoints registers the Agent Network settings routes. The
-// settings row is bootstrapped server-side on first provider create or on the
-// first PUT carrying a cluster; GET reads it and PUT applies a partial update
-// of the mutable collection toggles (cluster/subdomain stay immutable).
+// addSettingsEndpoints registers the Agent Network settings routes. POST
+// bootstraps the settings row, assigning the account's immutable endpoint;
+// GET reads it (defaults with an empty endpoint before bootstrap); PUT
+// carries every field, replacing the mutable collection toggles and rejecting
+// any change to the identity fields; DELETE removes the row — guarded so it
+// stays a bootstrap-repair operation — releasing the endpoint for a fresh
+// bootstrap.
 func (h *handler) addSettingsEndpoints(router *mux.Router) {
 	router.HandleFunc("/agent-network/settings", h.getSettings).Methods("GET", "OPTIONS")
+	router.HandleFunc("/agent-network/settings", h.createSettings).Methods("POST", "OPTIONS")
 	router.HandleFunc("/agent-network/settings", h.updateSettings).Methods("PUT", "OPTIONS")
+	router.HandleFunc("/agent-network/settings", h.deleteSettings).Methods("DELETE", "OPTIONS")
+}
+
+// createSettings bootstraps the account's settings row. Exactly one of
+// proxy_address (labeled endpoint; the server allocates the label) and
+// endpoint (self-addressed, claimed verbatim) must be provided; optional
+// collection toggles ride along with defaults for omitted fields.
+func (h *handler) createSettings(w http.ResponseWriter, r *http.Request) {
+	userAuth, err := nbcontext.GetUserAuthFromContext(r.Context())
+	if err != nil {
+		util.WriteError(r.Context(), err, w)
+		return
+	}
+
+	var req api.AgentNetworkSettingsCreateRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		util.WriteErrorResponse("couldn't parse JSON request", http.StatusBadRequest, w)
+		return
+	}
+
+	settings := types.DefaultSettings(userAuth.AccountId)
+	settings.FromAPICreateRequest(&req)
+
+	proxyAddress := ""
+	if req.ProxyAddress != nil {
+		proxyAddress = *req.ProxyAddress
+	}
+	endpoint := ""
+	if req.Endpoint != nil {
+		endpoint = *req.Endpoint
+	}
+
+	created, err := h.manager.CreateSettings(r.Context(), userAuth.UserId, settings, proxyAddress, endpoint)
+	if err != nil {
+		util.WriteError(r.Context(), err, w)
+		return
+	}
+	util.WriteJSONObject(r.Context(), w, created.ToAPIResponse())
 }
 
 // updateSettings replaces the mutable settings fields on the account's row.
@@ -48,6 +90,24 @@ func (h *handler) updateSettings(w http.ResponseWriter, r *http.Request) {
 	util.WriteJSONObject(r.Context(), w, updated.ToAPIResponse())
 }
 
+// deleteSettings removes the account's settings row, releasing the endpoint.
+// The manager refuses (412) while providers exist or a proxy is actively
+// serving the endpoint; a later POST bootstraps fresh, allocating a new
+// endpoint.
+func (h *handler) deleteSettings(w http.ResponseWriter, r *http.Request) {
+	userAuth, err := nbcontext.GetUserAuthFromContext(r.Context())
+	if err != nil {
+		util.WriteError(r.Context(), err, w)
+		return
+	}
+
+	if err := h.manager.DeleteSettings(r.Context(), userAuth.AccountId, userAuth.UserId); err != nil {
+		util.WriteError(r.Context(), err, w)
+		return
+	}
+	util.WriteJSONObject(r.Context(), w, util.EmptyObject{})
+}
+
 // getSettings returns the account's agent-network settings. Accounts that
 // haven't been bootstrapped yet read as the defaults with an empty cluster,
 // subdomain and endpoint; the manager synthesises that view.