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main.go
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main.go
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package main
import (
"os"
"fmt"
"flag"
"errors"
"strings"
mb "github.com/multiformats/go-multibase"
ipfssenc "github.com/jbenet/ipfs-senc"
senc "github.com/jbenet/go-simple-encrypt"
)
// flags
var (
Key string
API string
RandomKey bool
DirWrap bool
)
// errors
var (
ErrNoIPFS = errors.New("ipfs node error: not online")
)
const (
gwayGlobal = "https://gateway.ipfs.io"
gwayLocal = "http://localhost:8080"
)
var Usage = `ENCRYPT AND SEND
# will ask for a key
ipfs-senc share <local-source-path>
# encrypt with a known key. (256 bits please)
ipfs-senc --key <secret-key> share <local-source-path>
# encrypt with a randomly generated key. will be printed out.
ipfs-senc --random-key share <local-source-path>
GET AND DECRYPT
# will ask for key
ipfs-senc download <ipfs-link> <local-destination-path>
# decrypt with given key.
ipfs-senc --key <secret-key> download <ipfs-link> <local-destination-path>
OPTIONS
--h, --help show usage
--key <secret-key> a 256bit secret key, encoded with multibase (no key = random key)
--api <ipfs-api-url> an ipfs node api to use (overrides defaults)
-w, --wrap if adding a directory, wrap it first to preserve dir
EXAMPLES
> ipfs-senc share my_secret_dir
Enter a 256 bit AES key in multibase:
`
func init() {
flag.BoolVar(&RandomKey, "random-key", false, "use a randomly generated key (deprecated opt)")
flag.StringVar(&Key, "key", "", "an AES encryption key in hex")
flag.StringVar(&API, "api", "", "override IPFS node API")
flag.BoolVar(&DirWrap, "w", false, "if adding a directory, wrap it first to preserve dir")
flag.BoolVar(&DirWrap, "wrap", false, "if adding a directory, wrap it first to preserve dir")
flag.Usage = func() {
fmt.Fprintf(os.Stderr, Usage)
}
}
func decodeKey(k string) ([]byte, error) {
_, b, err := mb.Decode(k)
if err != nil {
return nil, fmt.Errorf("multibase decoding error: %v", err)
}
if len(b) != 32 {
return nil, fmt.Errorf("key must be exactly 256 bits. Was: %d", len(b))
}
return b, nil
}
func getSencKey(randomIfNone bool) (ipfssenc.Key, error) {
NilKey := ipfssenc.Key(nil)
var k []byte
var err error
if Key != "" {
k, err = decodeKey(Key)
} else if randomIfNone { // random key
k, err = senc.RandomKey()
} else {
err = errors.New("Please enter a key with --key")
}
if err != nil {
return NilKey, err
}
return ipfssenc.Key(k), nil
}
func cmdDownload(args []string) error {
if RandomKey {
return errors.New("cannot use --random-key with download")
}
if len(args) < 2 {
return errors.New("not enough arguments. download requires 2. see -h")
}
srcLink := ipfssenc.IPFSLink(args[0])
if len(srcLink) < 1 {
return errors.New("invalid ipfs-link")
}
dstPath := args[1]
if dstPath == "" {
return errors.New("requires a destination path")
}
// check for Key, get key.
key, err := getSencKey(false)
if err != nil {
return err
}
// fmt.Println("Initializing ipfs node...")
n := ipfssenc.GetROIPFSNode(API)
if !n.IsUp() {
return ErrNoIPFS
}
// fmt.Println("Getting", srcLink, "...")
err = ipfssenc.GetDecryptAndUnbundle(n, srcLink, dstPath, key)
if err != nil {
return err
}
fmt.Println("Unbundled to:", dstPath)
return nil
}
func cmdShare(args []string) error {
if len(args) < 1 {
return errors.New("not enough arguments. share requires 1. see -h")
}
srcPath := args[0]
if srcPath == "" {
return errors.New("requires a source path")
}
// check for Key, get key.
key, err := getSencKey(true)
if err != nil {
return err
}
// fmt.Println("Initializing ipfs node...")
n, err := ipfssenc.GetRWIPFSNode(API)
if err != nil {
return err
}
if !n.IsUp() {
return ErrNoIPFS
}
// fmt.Println("Sharing", srcPath, "...")
link, err := ipfssenc.BundleEncryptAndPut(n, srcPath, key, DirWrap)
if err != nil {
return err
}
l := string(link)
if !strings.HasPrefix(l, "/ipfs/") {
l = "/ipfs/" + l
}
keyStr, err := mb.Encode(mb.Base58BTC, key)
if err != nil {
return err
}
fmt.Println("Shared as: ", l)
fmt.Println("Key: ", keyStr)
fmt.Println("Ciphertext on local gateway: ", gwayGlobal, l)
fmt.Println("Ciphertext on global gateway: ", gwayLocal, l)
fmt.Println("")
fmt.Println("Get, Decrypt, and Unbundle with:")
fmt.Println(" ipfs-senc --key", keyStr, "download", l, "dstPath")
fmt.Println("")
fmt.Printf("View on the web: https://ipfs.io/ipns/ipfs-senc.net/#%s:%s\n", keyStr, l)
return nil
}
func errMain(args []string) error {
// no command is not an error. it's usage.
if len(args) == 0 {
fmt.Println(Usage)
return nil
}
cmd := args[0]
switch cmd {
case "download":
return cmdDownload(args[1:])
case "share":
return cmdShare(args[1:])
default:
return errors.New("Unknown command: " + cmd)
}
}
func main() {
flag.Parse()
args := flag.Args()
if err := errMain(args); err != nil {
fmt.Fprintln(os.Stderr, "error:", err)
os.Exit(-1)
}
}