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content.go
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content.go
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/*
* Copyright 2023 CoreLayer BV
*
* 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 config
import (
"bufio"
"log/slog"
"net"
"os"
"path/filepath"
"strings"
)
type Content struct {
CommonName string `json:"commonName" yaml:"commonName" mapstructure:"commonName"`
SubjectAlternativeNames []string `json:"subjectAlternativeNames" yaml:"subjectAlternativeNames" mapstructure:"subjectAlternativeNames"`
SubjectAlternativeNamesFile string `json:"subjectAlternativeNamesFile" yaml:"subjectAlternativeNamesFile" mapstructure:"subjectAlternativeNamesFile"`
}
func (c Content) GetDomains(basePath string) ([]string, error) {
var (
err error
output []string
domains []string
)
output = append(output, c.CommonName)
if len(c.SubjectAlternativeNames) > 0 {
output = append(output, c.SubjectAlternativeNames...)
}
domains, err = c.GetDomainsFromFile(basePath)
if err != nil {
return output, err
}
output = append(output, domains...)
return output, c.validateDomains(output)
}
func (c Content) GetDomainsFromFile(basePath string) ([]string, error) {
var (
err error
filename string
f *os.File
output []string
)
if c.SubjectAlternativeNamesFile != "" {
_, err = os.Stat(c.SubjectAlternativeNamesFile)
if err == nil {
filename = c.SubjectAlternativeNamesFile
} else {
fullPath := filepath.Join(basePath, c.SubjectAlternativeNamesFile)
_, err = os.Stat(fullPath)
if err == nil {
filename = fullPath
} else {
slog.Error("could not read subject alternative names from file", "filename", fullPath, "error", err)
return output, err
}
}
f, err = os.Open(filename)
defer func(f *os.File) {
err = f.Close()
if err != nil {
slog.Error("could not close file", "filename", filename, "error", err)
}
}(f)
if err != nil {
slog.Error("could not read subject alternative names from file", "filename", filename, "error", err)
return output, err
}
fs := bufio.NewScanner(f)
fs.Split(bufio.ScanLines)
for fs.Scan() {
output = append(output, fs.Text())
}
}
return output, nil
}
func (c Content) validateDomains(domains []string) error {
var err error
for _, domain := range domains {
// Skip wildcard domain validation
if strings.HasPrefix(domain, "*") {
continue
}
if _, err = net.LookupHost(domain); err != nil {
return err
}
}
return nil
}