forked from bufbuild/buf
/
netrc.go
146 lines (135 loc) · 3.63 KB
/
netrc.go
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// Copyright 2020-2021 Buf Technologies, Inc.
//
// 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 netrc contains functionality to work with netrc.
package netrc
import (
"os"
"path/filepath"
"github.com/bgentry/go-netrc/netrc"
"github.com/powerman/buf/internal/pkg/app"
"go.uber.org/multierr"
)
// Filename exposes the netrc filename based on the current operating system.
const Filename = netrcFilename
// Machine is a machine.
type Machine interface {
// Empty for default machine.
Name() string
Login() string
Password() string
Account() string
}
// NewMachine creates a new Machine.
func NewMachine(
name string,
login string,
password string,
account string,
) Machine {
return newMachine(name, login, password, account)
}
// GetMachineForName returns the Machine for the given name.
//
// Returns nil if no such Machine.
func GetMachineForName(envContainer app.EnvContainer, name string) (_ Machine, retErr error) {
filePath, err := getFilePath(envContainer)
if err != nil {
return nil, err
}
return getMachineForNameAndFilePath(name, filePath)
}
// PutMachine adds the given Machine to the configured netrc file.
func PutMachine(envContainer app.EnvContainer, machine Machine) error {
filePath, err := getFilePath(envContainer)
if err != nil {
return err
}
return putMachineForFilePath(machine, filePath)
}
func getFilePath(envContainer app.EnvContainer) (string, error) {
if netrcFilePath := envContainer.Env("NETRC"); netrcFilePath != "" {
return netrcFilePath, nil
}
homeDirPath, err := app.HomeDirPath(envContainer)
if err != nil {
return "", err
}
return filepath.Join(homeDirPath, netrcFilename), nil
}
func getMachineForNameAndFilePath(name string, filePath string) (_ Machine, retErr error) {
file, err := os.Open(filePath)
if err != nil {
if os.IsNotExist(err) {
return nil, nil
}
return nil, err
}
defer func() {
retErr = multierr.Append(retErr, file.Close())
}()
netrc, err := netrc.Parse(file)
if err != nil {
return nil, err
}
netrcMachine := netrc.FindMachine(name)
if netrcMachine == nil {
return nil, nil
}
return newMachine(
netrcMachine.Name,
netrcMachine.Login,
netrcMachine.Password,
netrcMachine.Account,
), nil
}
func putMachineForFilePath(machine Machine, filePath string) (retErr error) {
file, err := os.Open(filePath)
if err != nil {
if !os.IsNotExist(err) {
return err
}
// If a netrc file does not already exist, create one and continue.
file, err = os.Create(filePath)
if err != nil {
return err
}
}
defer func() {
retErr = multierr.Append(retErr, file.Close())
}()
netrc, err := netrc.Parse(file)
if err != nil {
return err
}
if foundMachine := netrc.FindMachine(machine.Name()); foundMachine != nil {
// If the machine already exists, remove it so that its entry is overwritten.
netrc.RemoveMachine(machine.Name())
}
// Put the machine into the user's netrc.
_ = netrc.NewMachine(
machine.Name(),
machine.Login(),
machine.Password(),
machine.Account(),
)
bytes, err := netrc.MarshalText()
if err != nil {
return err
}
info, err := file.Stat()
if err != nil {
return err
}
return os.WriteFile(filePath, bytes, info.Mode())
}