fixup! Bug 40209: Implement Basic Crypto Safety

Bug 42702: Read clipboard in parent actor rather than child.

browser/actors/CryptoSafetyChild.sys.mjs

@@ -5,12 +5,14 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-import { Bech32Decode } from "resource://gre/modules/Bech32Decode.sys.mjs";
-
 import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
 
 const lazy = {};
 
+ChromeUtils.defineESModuleGetters(lazy, {
+  setTimeout: "resource://gre/modules/Timer.sys.mjs",
+});
+
 XPCOMUtils.defineLazyPreferenceGetter(
   lazy,
   "isCryptoSafetyEnabled",
@@ -18,43 +20,6 @@ XPCOMUtils.defineLazyPreferenceGetter(
   true // Defaults to true.
 );
 
-function looksLikeCryptoAddress(s) {
-  // P2PKH and P2SH addresses
-  // https://stackoverflow.com/a/24205650
-  const bitcoinAddr = /^[13][a-km-zA-HJ-NP-Z1-9]{25,39}$/;
-  if (bitcoinAddr.test(s)) {
-    return true;
-  }
-
-  // Bech32 addresses
-  if (Bech32Decode(s) !== null) {
-    return true;
-  }
-
-  // regular addresses
-  const etherAddr = /^0x[a-fA-F0-9]{40}$/;
-  if (etherAddr.test(s)) {
-    return true;
-  }
-
-  // t-addresses
-  // https://www.reddit.com/r/zec/comments/8mxj6x/simple_regex_to_validate_a_zcash_tz_address/dzr62p5/
-  const zcashAddr = /^t1[a-zA-Z0-9]{33}$/;
-  if (zcashAddr.test(s)) {
-    return true;
-  }
-
-  // Standard, Integrated, and 256-bit Integrated addresses
-  // https://monero.stackexchange.com/a/10627
-  const moneroAddr =
-    /^4(?:[0-9AB]|[1-9A-HJ-NP-Za-km-z]{12}(?:[1-9A-HJ-NP-Za-km-z]{30})?)[1-9A-HJ-NP-Za-km-z]{93}$/;
-  if (moneroAddr.test(s)) {
-    return true;
-  }
-
-  return false;
-}
-
 export class CryptoSafetyChild extends JSWindowActorChild {
   handleEvent(event) {
     if (
@@ -70,13 +35,13 @@ export class CryptoSafetyChild extends JSWindowActorChild {
       return;
     }
 
-    this.contentWindow.navigator.clipboard.readText().then(clipText => {
-      const selection = clipText.replace(/\s+/g, "");
-      if (!looksLikeCryptoAddress(selection)) {
-        return;
-      }
+    // We send a message to the parent to inspect the clipboard content.
+    // NOTE: We wait until next cycle to allow the event to propagate and fill
+    // the clipboard before being read.
+    // NOTE: Using navigator.clipboard.readText fails with Wayland. See
+    // tor-browser#42702.
+    lazy.setTimeout(() => {
       this.sendAsyncMessage("CryptoSafety:CopiedText", {
-        selection,
         host: this.document.documentURIObject.host,
       });
     });

browser/actors/CryptoSafetyParent.sys.mjs

@@ -11,6 +11,7 @@ const lazy = {};
 
 ChromeUtils.defineESModuleGetters(lazy, {
   TorDomainIsolator: "resource://gre/modules/TorDomainIsolator.sys.mjs",
+  Bech32Decode: "resource://gre/modules/Bech32Decode.sys.mjs",
 });
 
 ChromeUtils.defineLazyGetter(lazy, "CryptoStrings", function () {
@@ -24,6 +25,43 @@ XPCOMUtils.defineLazyPreferenceGetter(
   true // Defaults to true.
 );
 
+function looksLikeCryptoAddress(s) {
+  // P2PKH and P2SH addresses
+  // https://stackoverflow.com/a/24205650
+  const bitcoinAddr = /^[13][a-km-zA-HJ-NP-Z1-9]{25,39}$/;
+  if (bitcoinAddr.test(s)) {
+    return true;
+  }
+
+  // Bech32 addresses
+  if (lazy.Bech32Decode(s) !== null) {
+    return true;
+  }
+
+  // regular addresses
+  const etherAddr = /^0x[a-fA-F0-9]{40}$/;
+  if (etherAddr.test(s)) {
+    return true;
+  }
+
+  // t-addresses
+  // https://www.reddit.com/r/zec/comments/8mxj6x/simple_regex_to_validate_a_zcash_tz_address/dzr62p5/
+  const zcashAddr = /^t1[a-zA-Z0-9]{33}$/;
+  if (zcashAddr.test(s)) {
+    return true;
+  }
+
+  // Standard, Integrated, and 256-bit Integrated addresses
+  // https://monero.stackexchange.com/a/10627
+  const moneroAddr =
+    /^4(?:[0-9AB]|[1-9A-HJ-NP-Za-km-z]{12}(?:[1-9A-HJ-NP-Za-km-z]{30})?)[1-9A-HJ-NP-Za-km-z]{93}$/;
+  if (moneroAddr.test(s)) {
+    return true;
+  }
+
+  return false;
+}
+
 export class CryptoSafetyParent extends JSWindowActorParent {
   async receiveMessage(aMessage) {
     if (
@@ -33,7 +71,24 @@ export class CryptoSafetyParent extends JSWindowActorParent {
       return;
     }
 
-    let address = aMessage.data.selection;
+    // Read the global clipboard. We assume the contents come from the HTTP
+    // page specified in `aMessage.data.host`.
+    const trans = Cc["@mozilla.org/widget/transferable;1"].createInstance(
+      Ci.nsITransferable
+    );
+    trans.init(null);
+    trans.addDataFlavor("text/plain");
+    Services.clipboard.getData(trans, Ci.nsIClipboard.kGlobalClipboard);
+    let data = {};
+    trans.getTransferData("text/plain", data);
+    data = data?.value.QueryInterface(Ci.nsISupportsString).data;
+
+    let address = data?.replace(/\s+/g, "");
+
+    if (!address || !looksLikeCryptoAddress(address)) {
+      return;
+    }
+
     if (address.length > 32) {
       address = `${address.substring(0, 32)}…`;
     }