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// Copyright 2021 Northern.tech AS
//
// 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.
package utils
import (
"regexp"
"strings"
"github.com/pkg/errors"
)
// Given a string list containing attribute names, and a string list containing
// attribute name wildcard expressions, return the list of attributes that match
// at least one of the expressions. Only '*' wildcard is supported at the
// moment, matching any number of characters, including zero.
//
// This is intended to be used to match `artifact_provides` attributes against
// `clears_artifact_provides` attributes.
func StringsMatchingWildcards(attributes, wildcards []string) ([]string, error) {
regexes := make([](*regexp.Regexp), 0, len(wildcards))
// Turn into regular expression.
for _, wildcard := range wildcards {
b := strings.Builder{}
b.WriteRune('^')
for i := 0; i < len(wildcard); i++ {
switch wildcard[i] {
case '\\':
if i+1 >= len(wildcard) {
return nil, errors.Errorf(
"Expression cannot end with a backslash: \"%s\"",
wildcard)
}
b.WriteString(wildcard[i : i+2])
i++
case '*':
b.WriteString(".*")
default:
b.WriteString(regexp.QuoteMeta(wildcard[i : i+1]))
}
}
b.WriteRune('$')
regex, err := regexp.Compile(b.String())
if err != nil {
return nil, errors.Wrap(err,
"Wildcard expression resulted in failed regular expression")
}
regexes = append(regexes, regex)
}
matches := []string{}
for _, attribute := range attributes {
for _, regex := range regexes {
if regex.MatchString(attribute) {
matches = append(matches, attribute)
break
}
}
}
return matches, nil
}
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