115 lines
3.5 KiB
Go
115 lines
3.5 KiB
Go
/*
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Copyright 2023 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cel
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import (
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"context"
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"fmt"
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"github.com/google/cel-go/common/types/traits"
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"github.com/google/cel-go/interpreter"
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)
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var _ ClaimsMapper = &mapper{}
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var _ UserMapper = &mapper{}
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// mapper implements the ClaimsMapper and UserMapper interface.
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type mapper struct {
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compilationResults []CompilationResult
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}
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// CELMapper is a struct that holds the compiled expressions for
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// username, groups, uid, extra, claimValidation and userValidation
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type CELMapper struct {
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Username ClaimsMapper
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Groups ClaimsMapper
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UID ClaimsMapper
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Extra ClaimsMapper
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ClaimValidationRules ClaimsMapper
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UserValidationRules UserMapper
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}
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// NewClaimsMapper returns a new ClaimsMapper.
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func NewClaimsMapper(compilationResults []CompilationResult) ClaimsMapper {
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return &mapper{
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compilationResults: compilationResults,
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}
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}
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// NewUserMapper returns a new UserMapper.
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func NewUserMapper(compilationResults []CompilationResult) UserMapper {
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return &mapper{
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compilationResults: compilationResults,
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}
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}
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// EvalClaimMapping evaluates the given claim mapping expression and returns a EvaluationResult.
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func (m *mapper) EvalClaimMapping(ctx context.Context, claims traits.Mapper) (EvaluationResult, error) {
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results, err := m.eval(ctx, &varNameActivation{name: claimsVarName, value: claims})
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if err != nil {
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return EvaluationResult{}, err
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}
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if len(results) != 1 {
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return EvaluationResult{}, fmt.Errorf("expected 1 evaluation result, got %d", len(results))
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}
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return results[0], nil
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}
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// EvalClaimMappings evaluates the given expressions and returns a list of EvaluationResult.
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func (m *mapper) EvalClaimMappings(ctx context.Context, claims traits.Mapper) ([]EvaluationResult, error) {
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return m.eval(ctx, &varNameActivation{name: claimsVarName, value: claims})
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}
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// EvalUser evaluates the given user expressions and returns a list of EvaluationResult.
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func (m *mapper) EvalUser(ctx context.Context, userInfo traits.Mapper) ([]EvaluationResult, error) {
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return m.eval(ctx, &varNameActivation{name: userVarName, value: userInfo})
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}
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func (m *mapper) eval(ctx context.Context, input *varNameActivation) ([]EvaluationResult, error) {
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evaluations := make([]EvaluationResult, len(m.compilationResults))
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for i, compilationResult := range m.compilationResults {
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var evaluation = &evaluations[i]
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evaluation.ExpressionAccessor = compilationResult.ExpressionAccessor
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evalResult, _, err := compilationResult.Program.ContextEval(ctx, input)
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if err != nil {
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return nil, fmt.Errorf("expression '%s' resulted in error: %w", compilationResult.ExpressionAccessor.GetExpression(), err)
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}
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evaluation.EvalResult = evalResult
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}
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return evaluations, nil
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}
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var _ interpreter.Activation = &varNameActivation{}
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type varNameActivation struct {
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name string
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value traits.Mapper
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}
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func (v *varNameActivation) ResolveName(name string) (any, bool) {
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if v.name != name {
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return nil, false
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}
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return v.value, true
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}
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func (v *varNameActivation) Parent() interpreter.Activation { return nil }
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