kami
90 lines
2.4 KiB
Go
90 lines
2.4 KiB
Go
// Package authz contains the single authorization policy used by all control
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// surfaces. Clients identify a surface; the bus decides what it may emit.
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package authz
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import (
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"fmt"
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"net/http"
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"strings"
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)
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type Surface string
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const (
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Telegram Surface = "telegram"
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Ntfy Surface = "ntfy"
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TUI Surface = "tui"
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Web Surface = "web"
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MCP Surface = "mcp"
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Maven Surface = "maven"
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)
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type Capability int
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const (
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Observe Capability = iota
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NotifyOnly
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GatedWrite
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FullControl
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)
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func ParseSurface(v string) Surface { return Surface(strings.ToLower(strings.TrimSpace(v))) }
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func CapabilityFor(s Surface) Capability {
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switch s {
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case Telegram, Ntfy:
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return NotifyOnly
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case TUI, Web:
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return FullControl
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case MCP, Maven:
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return GatedWrite
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default:
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return Observe
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}
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}
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func (s Surface) CanRead() bool { return CapabilityFor(s) >= Observe }
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func (s Surface) CanEmit(typ string) bool {
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if CapabilityFor(s) == FullControl {
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return true
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}
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return typ == "ApprovalRequested" && CapabilityFor(s) == GatedWrite
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}
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func (s Surface) RequiresApproval(typ string) bool {
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return CapabilityFor(s) == GatedWrite && typ != "ApprovalRequested"
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}
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func AuthorizeEvent(s Surface, typ string) error {
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if !s.CanEmit(typ) {
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return fmt.Errorf("surface %q cannot emit %s", s, typ)
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}
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return nil
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}
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// HTTP enforces the same policy at the bus boundary. Authentication is
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// optional for local development; when a token is supplied, control surfaces
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// must present it as a Bearer token.
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func HTTP(tokens map[Surface]string, next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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s := ParseSurface(r.Header.Get("X-Orchestra-Surface"))
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if s == "" {
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s = Web
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}
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if expected := tokens[s]; expected != "" && r.Header.Get("Authorization") != "Bearer "+expected {
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http.Error(w, "unauthorized surface", http.StatusUnauthorized)
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return
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}
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if (s == Telegram || s == Ntfy) && r.Method != http.MethodGet && r.Method != http.MethodHead {
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http.Error(w, "notify-only surface", http.StatusForbidden)
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return
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}
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if (s == MCP || s == Maven) && r.Method != http.MethodGet && r.Method != http.MethodHead && r.URL.Path != "/v1/events" {
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// Gated clients may submit only approval requests; ordinary control
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// endpoints must never become an accidental write path.
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if !strings.HasSuffix(r.URL.Path, "/approval") {
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http.Error(w, "approval required", http.StatusForbidden)
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return
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}
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}
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next.ServeHTTP(w, r)
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})
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}
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