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expression.go
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expression.go
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// Copyright 2023 Dimitrij Drus <dadrus@gmx.de>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// SPDX-License-Identifier: Apache-2.0
package authorizers
import (
"errors"
"fmt"
"github.com/google/cel-go/cel"
"github.com/dadrus/heimdall/internal/heimdall"
"github.com/dadrus/heimdall/internal/rules/mechanisms/cellib"
"github.com/dadrus/heimdall/internal/x"
"github.com/dadrus/heimdall/internal/x/errorchain"
)
type Expression struct {
Value string `mapstructure:"expression" validate:"required"`
Message string `mapstructure:"message"`
}
type compiledExpressions []*cellib.CompiledExpression
func (ce compiledExpressions) eval(obj, ctx any) error {
for i, expression := range ce {
err := expression.Eval(obj)
if err != nil {
if errors.Is(err, &cellib.EvalError{}) {
return errorchain.New(heimdall.ErrAuthorization).CausedBy(err).WithErrorContext(ctx)
}
return errorchain.NewWithMessagef(heimdall.ErrInternal, "failed evaluating expression %d", i+1).
CausedBy(err).WithErrorContext(ctx)
}
}
return nil
}
func compileExpressions(expressions []Expression, env *cel.Env) (compiledExpressions, error) {
compiled := make([]*cellib.CompiledExpression, len(expressions))
for i, expression := range expressions {
exp, err := cellib.CompileExpression(
env,
expression.Value,
x.IfThenElse(len(expression.Message) != 0, expression.Message, fmt.Sprintf("expression %d failed", i+1)),
)
if err != nil {
return nil, errorchain.NewWithMessagef(heimdall.ErrConfiguration,
"failed to compile expression %d (%s)", i+1, expression.Value).CausedBy(err)
}
compiled[i] = exp
}
return compiled, nil
}