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package main
import (
"bytes"
"crypto/ed25519"
"encoding/base64"
"encoding/binary"
"flag"
"fmt"
"io"
"net/http"
"os"
"strings"
"time"
)
var pubKey ed25519.PublicKey
var privKey ed25519.PrivateKey
var id string
var servers []string
// Sign and post to a server
func signPost(s string, b []byte) {
buf := new(bytes.Buffer)
err := binary.Write(buf, binary.LittleEndian, time.Now().Unix())
if err != nil {
panic(err)
}
_, err = buf.Write(b)
if err != nil {
panic(err)
}
_, err = buf.Write(ed25519.Sign(privKey, buf.Bytes()))
if err != nil {
panic(err)
}
resp, err := http.Post(s, "application/octet-stream", buf)
if err != nil {
panic(err)
}
fmt.Println(resp)
}
func main() {
flag.Parse()
if flag.Arg(0) == "setup" {
// Create keys
pubKey, privKey, err := ed25519.GenerateKey(nil)
if err != nil {
panic(err)
}
err = os.WriteFile("pubkey", pubKey, 0644)
if err != nil {
panic(err)
}
err = os.WriteFile("privkey", privKey, 0600)
if err != nil {
panic(err)
}
// Create servers file
_, err = os.Create("servers")
if err != nil {
panic(err)
}
fmt.Printf("Success! Your user ID: %s\n", base64.RawURLEncoding.EncodeToString(pubKey))
return
}
pubKeyBytes, err := os.ReadFile("pubkey")
if err != nil {
panic(err)
}
pubKey = ed25519.PublicKey(pubKeyBytes)
privKeyBytes, err := os.ReadFile("privkey")
if err != nil {
panic(err)
}
privKey = ed25519.PrivateKey(privKeyBytes)
serversBytes, err := os.ReadFile("servers")
if err != nil {
panic(err)
}
id = base64.RawURLEncoding.EncodeToString(pubKey)
servers = strings.Split(string(serversBytes), "\n")
if servers[0] == "" {
servers = servers[1:]
}
fmt.Println(id, servers)
if flag.Arg(0) == "add" {
// Add server
servers = append(servers, flag.Arg(1))
signPost(flag.Arg(1)+"/dht/"+id, []byte(strings.Join(servers, "\n")))
http.Get(flag.Arg(1) + "/user/" + id)
if servers[0] != flag.Arg(1) {
http.Get(servers[0] + "/user/" + id)
}
err := os.WriteFile("servers", []byte(strings.Join(servers, "\n")), 0644)
if err != nil {
panic(err)
}
} else if flag.Arg(0) == "remove" {
// Remove server
for i := range servers {
if servers[i] == flag.Arg(1) {
servers = append(servers[:i], servers[i+1:]...)
break
}
}
if len(servers) > 0 {
signPost(servers[0]+"/dht/"+id, []byte(strings.Join(servers, "\n")))
http.Get(servers[0] + "/user/" + id)
} else {
signPost(flag.Arg(1)+"/dht/"+id, []byte(strings.Join(servers, "\n")))
}
http.Get(flag.Arg(1) + "/user/" + id)
err := os.WriteFile("servers", []byte(strings.Join(servers, "\n")), 0644)
if err != nil {
panic(err)
}
} else if flag.Arg(0) == "primary" {
// Make server a primary
for i := range servers {
if i > 0 && servers[i] == flag.Arg(1) {
servers[i] = servers[0]
servers[0] = flag.Arg(i)
signPost(flag.Arg(1)+"/dht/"+id, []byte(strings.Join(servers, "\n")))
http.Get(servers[0] + "/user/" + id)
http.Get(servers[i] + "/user/" + id)
break
}
}
err := os.WriteFile("servers", []byte(strings.Join(servers, "\n")), 0644)
if err != nil {
panic(err)
}
} else if flag.Arg(0) == "get" {
user := flag.Arg(1)
filename := flag.Arg(2)
response, err := http.Get(servers[0] + "/storage/" + user + "/" + filename)
if err != nil {
panic(err)
}
b, err := io.ReadAll(response.Body)
if err != nil {
panic(err)
}
err = os.WriteFile(filename, b, 0644)
if err != nil {
panic(err)
}
} else if flag.Arg(0) == "post" {
filename := flag.Arg(1)
file, err := os.ReadFile(filename)
if err != nil {
panic(err)
}
signPost(servers[0] + "/storage/" + id + "/" + filename, file)
}
}
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