mirror of
https://github.com/gravitational/teleport.git
synced 2026-09-21 05:55:42 +08:00
Edward Dowling
014859cb33
* Copy expression package out of /e * Add doc string for default parser spec. * Add more info to default parser spec doc string * Fix typo in doc string * Add missing comments including license info
71 lines
2.1 KiB
Go
71 lines
2.1 KiB
Go
/*
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* Teleport
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* Copyright (C) 2024 Gravitational, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package expression
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import (
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"errors"
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"github.com/gravitational/trace"
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"github.com/gravitational/teleport/lib/utils/typical"
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)
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// EvaluateTraitsMap evaluates expression that must evaluate to either string or Set.
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// traitsMap: key is name of the trait and values are list of predicate expressions.
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func EvaluateTraitsMap[TEnv any](env TEnv, traitsMap map[string][]string, parseExpression func(input string) (typical.Expression[TEnv, any], error)) (Dict, error) {
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d, err := NewDict()
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if err != nil {
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return nil, trace.Wrap(err)
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}
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for key, values := range traitsMap {
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for _, expr := range values {
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e, err := parseExpression(expr)
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if err != nil {
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var u typical.UnknownIdentifierError
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if errors.As(err, &u) {
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id := u.Identifier()
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if id == expr {
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// If the entire expression evaluates to a single unknown
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// identifier, treat it as a string. This is to support rules like
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// groups: [devs]
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// instead of requiring extra quotes like
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// groups: ['"devs"']
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d[key] = union(d[key], NewSet(id))
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continue
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}
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}
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return nil, trace.Wrap(err, "error parsing expression: %q", expr)
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}
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result, err := e.Evaluate(env)
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if err != nil {
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return nil, trace.Wrap(err, "error evaluating expression: %q", expr)
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}
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s, err := traitsMapResultToSet(result, expr)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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d[key] = union(d[key], s)
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}
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}
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return d, nil
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}
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