Prototype with single host server and no admin panel (#2)

Reviewed-on: wrenn/sandbox#2
Co-authored-by: pptx704 <rafeed@omukk.dev>
Co-committed-by: pptx704 <rafeed@omukk.dev>

internal/auth/context.go

@@ -0,0 +1,63 @@
+package auth
+
+import "context"
+
+type contextKey int
+
+const authCtxKey contextKey = 0
+
+// AuthContext is stamped into request context by auth middleware.
+type AuthContext struct {
+	TeamID string
+	UserID string // empty when authenticated via API key
+	Email  string // empty when authenticated via API key
+}
+
+// WithAuthContext returns a new context with the given AuthContext.
+func WithAuthContext(ctx context.Context, a AuthContext) context.Context {
+	return context.WithValue(ctx, authCtxKey, a)
+}
+
+// FromContext retrieves the AuthContext. Returns zero value and false if absent.
+func FromContext(ctx context.Context) (AuthContext, bool) {
+	a, ok := ctx.Value(authCtxKey).(AuthContext)
+	return a, ok
+}
+
+// MustFromContext retrieves the AuthContext. Panics if absent — only call
+// inside handlers behind auth middleware.
+func MustFromContext(ctx context.Context) AuthContext {
+	a, ok := FromContext(ctx)
+	if !ok {
+		panic("auth: MustFromContext called on unauthenticated request")
+	}
+	return a
+}
+
+const hostCtxKey contextKey = 1
+
+// HostContext is stamped into request context by host token middleware.
+type HostContext struct {
+	HostID string
+}
+
+// WithHostContext returns a new context with the given HostContext.
+func WithHostContext(ctx context.Context, h HostContext) context.Context {
+	return context.WithValue(ctx, hostCtxKey, h)
+}
+
+// HostFromContext retrieves the HostContext. Returns zero value and false if absent.
+func HostFromContext(ctx context.Context) (HostContext, bool) {
+	h, ok := ctx.Value(hostCtxKey).(HostContext)
+	return h, ok
+}
+
+// MustHostFromContext retrieves the HostContext. Panics if absent — only call
+// inside handlers behind host token middleware.
+func MustHostFromContext(ctx context.Context) HostContext {
+	h, ok := HostFromContext(ctx)
+	if !ok {
+		panic("auth: MustHostFromContext called on unauthenticated request")
+	}
+	return h
+}