Rewrite permission system

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

pkg/iam/policy_set.go

@@ -0,0 +1,71 @@
+// Copyright (c) 2025 Probo Inc <hello@getprobo.com>.
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+package iam
+
+import "go.probo.inc/probo/pkg/iam/policy"
+
+// PolicySet holds role-based and self-management policies.
+// Services create their own PolicySet and combine them when creating the Authorizer.
+type PolicySet struct {
+	// RolePolicies maps role names to policies.
+	RolePolicies map[string][]*policy.Policy
+
+	// SelfManagePolicies are applied to all authenticated users.
+	SelfManagePolicies []*policy.Policy
+}
+
+// NewPolicySet creates an empty PolicySet.
+func NewPolicySet() *PolicySet {
+	return &PolicySet{
+		RolePolicies:       make(map[string][]*policy.Policy),
+		SelfManagePolicies: make([]*policy.Policy, 0),
+	}
+}
+
+// AddRolePolicy adds a policy for a specific role.
+func (ps *PolicySet) AddRolePolicy(role string, policies ...*policy.Policy) *PolicySet {
+	ps.RolePolicies[role] = append(ps.RolePolicies[role], policies...)
+	return ps
+}
+
+// AddSelfManagePolicy adds policies applied to all authenticated users.
+func (ps *PolicySet) AddSelfManagePolicy(policies ...*policy.Policy) *PolicySet {
+	ps.SelfManagePolicies = append(ps.SelfManagePolicies, policies...)
+	return ps
+}
+
+// Merge combines another PolicySet into this one.
+func (ps *PolicySet) Merge(other *PolicySet) *PolicySet {
+	for role, policies := range other.RolePolicies {
+		ps.RolePolicies[role] = append(ps.RolePolicies[role], policies...)
+	}
+	ps.SelfManagePolicies = append(ps.SelfManagePolicies, other.SelfManagePolicies...)
+	return ps
+}
+
+func IAMPolicySet() *PolicySet {
+	return NewPolicySet().
+		AddRolePolicy("OWNER", IAMOwnerPolicy).
+		AddRolePolicy("ADMIN", IAMAdminPolicy).
+		AddRolePolicy("VIEWER", IAMViewerPolicy).
+		AddRolePolicy("EMPLOYEE", IAMViewerPolicy).
+		AddRolePolicy("AUDITOR", IAMViewerPolicy).
+		AddSelfManagePolicy(
+			IAMSelfManageIdentityPolicy,
+			IAMSelfManageSessionPolicy,
+			IAMSelfManageInvitationPolicy,
+			IAMSelfManageMembershipPolicy,
+		)
+}