95 lines
3.3 KiB
Go
95 lines
3.3 KiB
Go
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package router
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import (
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"errors"
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"fmt"
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"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/ape"
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"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/bearer"
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cidSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
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"git.frostfs.info/TrueCloudLab/policy-engine/pkg/chain"
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policyengine "git.frostfs.info/TrueCloudLab/policy-engine/pkg/engine"
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)
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func newTarget(ct ape.ChainTarget) (policyengine.Target, error) {
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var target policyengine.Target
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switch ct.TargetType {
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case ape.TargetTypeContainer:
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var cid cidSDK.ID
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err := cid.DecodeString(ct.Name)
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if err != nil {
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return target, fmt.Errorf("invalid cid format: %s", target.Name)
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}
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target.Type = policyengine.Container
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case ape.TargetTypeGroup:
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target.Type = policyengine.Group
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case ape.TargetTypeNamespace:
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target.Type = policyengine.Namespace
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case ape.TargetTypeUser:
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target.Type = policyengine.User
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default:
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return target, fmt.Errorf("unsupported target type: %v", ct.TargetType)
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}
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target.Name = ct.Name
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return target, nil
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}
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type morphReaderDecorator struct {
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policyengine.MorphRuleChainStorageReader
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bearerTokenTarget policyengine.Target
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bearerTokenChains []*chain.Chain
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}
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func newMorphReaderDecorator(r policyengine.MorphRuleChainStorageReader, override bearer.APEOverride) (*morphReaderDecorator, error) {
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if r == nil {
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return nil, errors.New("empty morph chain rule reader")
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}
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t, err := newTarget(override.Target)
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if err != nil {
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return nil, err
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}
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bearerTokenChains := make([]*chain.Chain, len(override.Chains))
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for i := range override.Chains {
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chain := new(chain.Chain)
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if err := chain.DecodeBytes(override.Chains[i].Raw); err != nil {
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return nil, fmt.Errorf("invalid ape chain: %w", err)
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}
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bearerTokenChains[i] = chain
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}
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return &morphReaderDecorator{
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MorphRuleChainStorageReader: r,
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bearerTokenTarget: t,
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bearerTokenChains: bearerTokenChains,
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}, nil
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}
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func (m *morphReaderDecorator) ListMorphRuleChains(name chain.Name, target policyengine.Target) ([]*chain.Chain, error) {
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if len(m.bearerTokenChains) > 0 && m.bearerTokenTarget.Type == target.Type {
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if m.bearerTokenTarget.Name != target.Name {
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return nil, fmt.Errorf("unexpected bearer token target: %s", m.bearerTokenTarget.Name)
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}
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return m.bearerTokenChains, nil
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}
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return m.MorphRuleChainStorageReader.ListMorphRuleChains(name, target)
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}
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// BearerChainFeedRouter creates a chain router emplacing bearer token rule chains.
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// Bearer token chains override only container target chains within Policy contract. This means the order of checking
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// is as follows:
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//
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// 1. Local overrides;
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// 2. Policy contract chains for a namespace target (as namespace chains have higher priority);
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// 3. Bearer token chains for a container target - if they're not defined, then it checks Policy contract chains;
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// 4. Checks for the remaining targets.
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func BearerChainFeedRouter(localOverrideStorage policyengine.LocalOverrideStorage, morphChainStorage policyengine.MorphRuleChainStorageReader, override bearer.APEOverride) (policyengine.ChainRouter, error) {
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mr, err := newMorphReaderDecorator(morphChainStorage, override)
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if err != nil {
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return nil, fmt.Errorf("create morph reader with bearer override error: %w", err)
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}
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return policyengine.NewDefaultChainRouterWithLocalOverrides(mr, localOverrideStorage), nil
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}
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