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external_access.go
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/
external_access.go
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// Copyright (C) 2021 Storj Labs, Inc.
// See LICENSE for copying information.
package main
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"os"
"path/filepath"
"github.com/zeebo/clingy"
"github.com/zeebo/errs"
"storj.io/uplink"
"storj.io/uplink/private/access"
)
func (ex *external) loadAccesses() error {
if ex.access.accesses != nil {
return nil
}
fh, err := os.Open(ex.AccessInfoFile())
if os.IsNotExist(err) {
return nil
} else if err != nil {
return errs.Wrap(err)
}
defer func() { _ = fh.Close() }()
var jsonInput struct {
Default string
Accesses map[string]string
}
if err := json.NewDecoder(fh).Decode(&jsonInput); err != nil {
return errs.Wrap(err)
}
// older versions may have written out invalid access mapping files
// so check here and resave if necessary.
defaultName, ok := checkAccessMapping(jsonInput.Default, jsonInput.Accesses)
if ok {
if err := ex.SaveAccessInfo(defaultName, jsonInput.Accesses); err != nil {
return errs.Wrap(err)
}
}
ex.access.defaultName = jsonInput.Default
ex.access.accesses = jsonInput.Accesses
ex.access.loaded = true
return nil
}
func parseAccessDataOrPossiblyFile(accessDataOrFile string) (*uplink.Access, error) {
access, parseErr := uplink.ParseAccess(accessDataOrFile)
if parseErr == nil {
return access, nil
}
accessData, readErr := os.ReadFile(accessDataOrFile)
if readErr != nil {
var pathErr *os.PathError
if errors.As(readErr, &pathErr) {
readErr = pathErr.Err
}
return nil, errs.New("unable to open or parse access: %w", errs.Combine(parseErr, readErr))
}
return uplink.ParseAccess(string(bytes.TrimSpace(accessData)))
}
func (ex *external) OpenAccess(accessDesc string) (access *uplink.Access, err error) {
if access, err := parseAccessDataOrPossiblyFile(accessDesc); err == nil {
return access, nil
}
defaultName, accesses, err := ex.GetAccessInfo(true)
if err != nil {
return nil, err
}
if accessDesc != "" {
defaultName = accessDesc
}
if accessData, ok := accesses[defaultName]; ok {
return uplink.ParseAccess(accessData)
}
// the default was likely a name, so return a potentially nicer message.
if len(defaultName) < 20 {
return nil, errs.New("Cannot find access named %q in saved accesses", defaultName)
}
return nil, errs.New("Unable to get access grant")
}
func (ex *external) GetAccessInfo(required bool) (string, map[string]string, error) {
if !ex.access.loaded {
if err := ex.loadAccesses(); err != nil {
return "", nil, err
}
if required && !ex.access.loaded {
return "", nil, errs.New("No accesses configured. Use 'access import' or 'access create' to create one")
}
}
// return a copy to avoid mutations messing things up
accesses := make(map[string]string)
for name, accessData := range ex.access.accesses {
accesses[name] = accessData
}
return ex.access.defaultName, accesses, nil
}
// SaveAccessInfo writes out the access file using the provided values.
func (ex *external) SaveAccessInfo(defaultName string, accesses map[string]string) error {
// TODO(jeff): write it atomically
accessFh, err := os.OpenFile(ex.AccessInfoFile(), os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return errs.Wrap(err)
}
defer func() { _ = accessFh.Close() }()
var jsonOutput = struct {
Default string
Accesses map[string]string
}{
Default: defaultName,
Accesses: accesses,
}
data, err := json.MarshalIndent(jsonOutput, "", "\t")
if err != nil {
return errs.Wrap(err)
}
if _, err := accessFh.Write(data); err != nil {
return errs.Wrap(err)
}
if err := accessFh.Sync(); err != nil {
return errs.Wrap(err)
}
if err := accessFh.Close(); err != nil {
return errs.Wrap(err)
}
return nil
}
func (ex *external) RequestAccess(ctx context.Context, satelliteAddr, apiKey, passphrase string, unencryptedObjectKeys bool) (_ *uplink.Access, err error) {
defer mon.Task()(&ctx)(&err)
config := uplink.Config{}
if unencryptedObjectKeys {
access.DisableObjectKeyEncryption(&config)
}
access, err := config.RequestAccessWithPassphrase(ctx, satelliteAddr, apiKey, passphrase)
if err != nil {
return nil, errs.Wrap(err)
}
return access, nil
}
func (ex *external) ExportAccess(ctx context.Context, access *uplink.Access, filename string) (err error) {
defer mon.Task()(&ctx)(&err)
serialized, err := access.Serialize()
if err != nil {
return errs.Wrap(err)
}
// convert to an absolute path, mostly for output purposes.
filename, err = filepath.Abs(filename)
if err != nil {
return errs.Wrap(err)
}
// note: we don't use os.WriteFile because we want to pass
// the O_EXCL flag to ensure we don't overwrite existing files.
f, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0600)
if err != nil {
return err
}
defer func() { _ = f.Close() }()
if _, err := f.WriteString(serialized + "\n"); err != nil {
return errs.Wrap(err)
}
if err := f.Close(); err != nil {
return errs.Wrap(err)
}
fmt.Fprintln(clingy.Stdout(ctx), "Exported access to:", filename)
return nil
}