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config.go
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config.go
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// Copyright 2022 SLSA Authors
//
// 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 pkg
import (
"errors"
"fmt"
"os"
"path/filepath"
"strings"
"gopkg.in/yaml.v3"
"github.com/slsa-framework/slsa-github-generator/internal/utils"
)
var (
// ErrorInvalidEnvironmentVariable is an invalid environment variable.
ErrorInvalidEnvironmentVariable = errors.New("invalid environment variable")
// ErrorUnsupportedVersion is non-supported version.
ErrorUnsupportedVersion = errors.New("version not supported")
// ErrorInvalidDirectory is an invalid directory.
ErrorInvalidDirectory = errors.New("invalid directory")
)
var supportedVersions = map[int]bool{
1: true,
}
type goReleaserConfigFile struct {
Goos string `yaml:"goos"`
Goarch string `yaml:"goarch"`
Env []string `yaml:"env"`
Flags []string `yaml:"flags"`
Ldflags []string `yaml:"ldflags"`
Binary string `yaml:"binary"`
Version int `yaml:"version"`
Main *string `yaml:"main"`
Dir *string `yaml:"dir"`
}
type GoReleaserConfig struct {
Goos string
Goarch string
Main *string
Dir *string
Env map[string]string
Flags []string
Ldflags []string
Binary string
}
func configFromString(b []byte) (*GoReleaserConfig, error) {
var cf goReleaserConfigFile
if err := yaml.Unmarshal(b, &cf); err != nil {
return nil, fmt.Errorf("yaml.Unmarshal: %w", err)
}
return fromConfig(&cf)
}
func ConfigFromFile(pathfn string) (*GoReleaserConfig, error) {
if err := validatePath(pathfn); err != nil {
return nil, err
}
cfg, err := os.ReadFile(filepath.Clean(pathfn))
if err != nil {
return nil, fmt.Errorf("os.ReadFile: %w", err)
}
return configFromString(cfg)
}
func fromConfig(cf *goReleaserConfigFile) (*GoReleaserConfig, error) {
if err := validateVersion(cf); err != nil {
return nil, err
}
if err := validateMain(cf); err != nil {
return nil, err
}
if err := validateDir(cf); err != nil {
return nil, err
}
cfg := GoReleaserConfig{
Goos: cf.Goos,
Goarch: cf.Goarch,
Flags: cf.Flags,
Ldflags: cf.Ldflags,
Binary: cf.Binary,
Main: cf.Main,
Dir: cf.Dir,
}
if err := cfg.setEnvs(cf); err != nil {
return nil, err
}
return &cfg, nil
}
func validatePath(path string) error {
err := utils.PathIsUnderCurrentDirectory(path)
if err != nil {
return convertPathError(err, "PathIsUnderCurrentDirectory")
}
return nil
}
func validateDir(cf *goReleaserConfigFile) error {
if cf.Dir == nil {
return nil
}
return validatePath(*cf.Dir)
}
func validateMain(cf *goReleaserConfigFile) error {
if cf.Main == nil {
return nil
}
// Validate the main path is under the current directory.
if err := utils.PathIsUnderCurrentDirectory(*cf.Main); err != nil {
return convertPathError(err, "PathIsUnderCurrentDirectory")
}
return nil
}
func convertPathError(e error, msg string) error {
// TODO(https://github.com/slsa-framework/slsa-github-generator/issues/599): use same error types.
if e != nil {
var errInternal *utils.ErrInternal
var errPath *utils.ErrInvalidPath
if errors.As(e, &errInternal) ||
errors.As(e, &errPath) {
return ErrorInvalidDirectory
}
return fmt.Errorf("%s: %w", msg, e)
}
return e
}
func validateVersion(cf *goReleaserConfigFile) error {
_, exists := supportedVersions[cf.Version]
if !exists {
return fmt.Errorf("%w:%d", ErrorUnsupportedVersion, cf.Version)
}
return nil
}
func (r *GoReleaserConfig) setEnvs(cf *goReleaserConfigFile) error {
m := make(map[string]string)
for _, e := range cf.Env {
es := strings.Split(e, "=")
if len(es) != 2 {
return fmt.Errorf("%w: %s", ErrorInvalidEnvironmentVariable, e)
}
m[es[0]] = es[1]
}
if len(m) > 0 {
r.Env = m
}
return nil
}