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dendritejs: Persist ed25519 keys in localforage (#1046)
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commit
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@ -20,6 +20,7 @@ import (
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"crypto/ed25519"
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"fmt"
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"net/http"
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"syscall/js"
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"github.com/matrix-org/dendrite/appservice"
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"github.com/matrix-org/dendrite/clientapi"
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@ -49,11 +50,89 @@ func init() {
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fmt.Println("dendrite.js starting...")
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}
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const keyNameEd25519 = "_go_ed25519_key"
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func readKeyFromLocalStorage() (key ed25519.PrivateKey, err error) {
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localforage := js.Global().Get("localforage")
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if !localforage.Truthy() {
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err = fmt.Errorf("readKeyFromLocalStorage: no localforage")
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return
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}
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// https://localforage.github.io/localForage/
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item, ok := await(localforage.Call("getItem", keyNameEd25519))
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if !ok || !item.Truthy() {
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err = fmt.Errorf("readKeyFromLocalStorage: no key in localforage")
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return
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}
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fmt.Println("Found key in localforage")
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// extract []byte and make an ed25519 key
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seed := make([]byte, 32, 32)
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js.CopyBytesToGo(seed, item)
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return ed25519.NewKeyFromSeed(seed), nil
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}
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func writeKeyToLocalStorage(key ed25519.PrivateKey) error {
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localforage := js.Global().Get("localforage")
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if !localforage.Truthy() {
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return fmt.Errorf("writeKeyToLocalStorage: no localforage")
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}
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// make a Uint8Array from the key's seed
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seed := key.Seed()
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jsSeed := js.Global().Get("Uint8Array").New(len(seed))
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js.CopyBytesToJS(jsSeed, seed)
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// write it
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localforage.Call("setItem", keyNameEd25519, jsSeed)
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return nil
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}
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// taken from https://go-review.googlesource.com/c/go/+/150917
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// await waits until the promise v has been resolved or rejected and returns the promise's result value.
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// The boolean value ok is true if the promise has been resolved, false if it has been rejected.
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// If v is not a promise, v itself is returned as the value and ok is true.
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func await(v js.Value) (result js.Value, ok bool) {
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if v.Type() != js.TypeObject || v.Get("then").Type() != js.TypeFunction {
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return v, true
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}
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done := make(chan struct{})
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onResolve := js.FuncOf(func(this js.Value, args []js.Value) interface{} {
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result = args[0]
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ok = true
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close(done)
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return nil
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})
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defer onResolve.Release()
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onReject := js.FuncOf(func(this js.Value, args []js.Value) interface{} {
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result = args[0]
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ok = false
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close(done)
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return nil
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})
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defer onReject.Release()
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v.Call("then", onResolve, onReject)
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<-done
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return
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}
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func generateKey() ed25519.PrivateKey {
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_, priv, err := ed25519.GenerateKey(nil)
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// attempt to look for a seed in JS-land and if it exists use it.
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priv, err := readKeyFromLocalStorage()
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if err == nil {
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fmt.Println("Read key from localStorage")
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return priv
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}
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// generate a new key
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fmt.Println(err, " : Generating new ed25519 key")
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_, priv, err = ed25519.GenerateKey(nil)
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if err != nil {
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logrus.Fatalf("Failed to generate ed25519 key: %s", err)
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}
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if err := writeKeyToLocalStorage(priv); err != nil {
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fmt.Println("failed to write key to localStorage: ", err)
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// non-fatal, we'll just have amnesia for a while
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}
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return priv
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}
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