wasm-client: add method to validate a recipient's address

clients/webassembly/src/binary_message_helper.rs

@@ -42,19 +42,28 @@ pub struct StringMessage {
 
 /// Create a new binary message with a user-specified `kind`.
 #[wasm_bindgen]
-pub fn create_binary_message(kind: u8, payload: Vec<u8>) -> Vec<u8> {
-    create_binary_message_with_headers(kind, payload, "".to_string())
+pub fn create_binary_message(kind: u8, payload: Vec<u8>, headers: Option<String>) -> Vec<u8> {
+    create_binary_message_with_headers(kind, payload, headers)
 }
 
 /// Create a new message with a UTF-8 encoded string `payload` and a user-specified `kind`.
 #[wasm_bindgen]
-pub fn create_binary_message_from_string(kind: u8, payload: String) -> Vec<u8> {
-    create_binary_message_with_headers(kind, payload.as_bytes().to_vec(), "".to_string())
+pub fn create_binary_message_from_string(
+    kind: u8,
+    payload: String,
+    headers: Option<String>,
+) -> Vec<u8> {
+    create_binary_message_with_headers(kind, payload.as_bytes().to_vec(), headers)
 }
 
 /// Create a new binary message with a user-specified `kind`, and `headers` as a string.
 #[wasm_bindgen]
-pub fn create_binary_message_with_headers(kind: u8, payload: Vec<u8>, headers: String) -> Vec<u8> {
+pub fn create_binary_message_with_headers(
+    kind: u8,
+    payload: Vec<u8>,
+    headers: Option<String>,
+) -> Vec<u8> {
+    let headers = headers.unwrap_or_else(|| "".to_string());
     let headers = headers.as_bytes().to_vec();
     let size = (headers.len() as u64).to_be_bytes().to_vec();
     vec![vec![kind], size, headers, payload].concat()
@@ -169,7 +178,7 @@ mod tests {
         let message_as_bytes = create_binary_message_with_headers(
             42u8,
             vec![0u8, 1u8, 2u8],
-            "test headers".to_string(),
+            Some("test headers".to_string()),
         );
 
         // calculate header size
@@ -197,7 +206,7 @@ mod tests {
     #[wasm_bindgen_test]
     fn test_binary_with_empty_headers() {
         let message_as_bytes =
-            create_binary_message_with_headers(42u8, vec![0u8, 1u8, 2u8], "".to_string());
+            create_binary_message_with_headers(42u8, vec![0u8, 1u8, 2u8], Some("".to_string()));
 
         let expected_size = 0;
 

clients/webassembly/src/lib.rs

@@ -9,6 +9,8 @@ pub mod binary_message_helper;
 mod client;
 #[cfg(target_arch = "wasm32")]
 pub mod gateway_selector;
+#[cfg(target_arch = "wasm32")]
+pub mod validation;
 
 #[wasm_bindgen]
 pub fn set_panic_hook() {

clients/webassembly/src/validation.rs

@@ -0,0 +1,35 @@
+use nymsphinx::addressing::clients::Recipient;
+use wasm_bindgen::prelude::*;
+
+#[wasm_bindgen]
+pub fn validate_recipient(recipient: String) -> Result<(), JsError> {
+    match Recipient::try_from_base58_string(recipient) {
+        Ok(_) => Ok(()),
+        Err(e) => Err(JsError::new(format!("{}", e).as_str())),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::validate_recipient;
+    use wasm_bindgen_test::*;
+
+    #[wasm_bindgen_test]
+    fn test_recipient_validation_ok() {
+        let res = validate_recipient("DyQmXnst5NGGjzUZxRC5Bjs5bd7CBF3xMpsSmbRiizr2.GH6YTBP2NXU3AVqd8WjiTMVyeMjunXMEsp7gVCMEJqpD@336yuXAeGEgedRfqTJZsG2YV7P13QH1bHv1SjCZYarc9".to_string());
+        assert!(res.is_ok())
+    }
+
+    #[wasm_bindgen_test]
+    fn test_recipient_validation_fails() {
+        assert!(validate_recipient("  DyQmXnst5NGGjzUZxRC5Bjs5bd7CBF3xMpsSmbRiizr2.GH6YTBP2NXU3AVqd8WjiTMVyeMjunXMEsp7gVCMEJqpD@336yuXAeGEgedRfqTJZsG2YV7P13QH1bHv1SjCZYarc9".to_string()).is_err());
+        assert!(validate_recipient(
+            "DyQmXnst5NGGjzUZxRC5BjbRiizr2.GH6YTBP2NXU3AVqd8WD@336yuXAeGEgedRfqTJZQH1bHv1SjCZYarc9"
+                .to_string()
+        )
+        .is_err());
+        assert!(validate_recipient("🙀🙀🙀🙀".to_string()).is_err());
+        assert!(validate_recipient("".to_string()).is_err());
+        assert!(validate_recipient(" ".to_string()).is_err());
+    }
+}

sdk/typescript/examples/react-webpack-with-theme-example/src/App.tsx

@@ -5,9 +5,12 @@ import {
   Chip,
   CircularProgress,
   Container,
+  FormControlLabel,
+  FormGroup,
   InputAdornment,
   Link,
   Stack,
+  Switch,
   TextField,
   Tooltip,
   Typography,
@@ -20,6 +23,8 @@ import CallReceivedIcon from '@mui/icons-material/CallReceived';
 import PersonIcon from '@mui/icons-material/Person';
 import PersonOffIcon from '@mui/icons-material/PersonOff';
 import ErrorIcon from '@mui/icons-material/Error';
+import VisibilityIcon from '@mui/icons-material/Visibility';
+import VisibilityOffIcon from '@mui/icons-material/VisibilityOff';
 import { NymLogo } from '@nymproject/react/logo/NymLogo';
 import { NymThemeProvider } from '@nymproject/mui-theme';
 import { useTheme } from '@mui/material/styles';
@@ -28,9 +33,10 @@ import { DropzoneDialog } from 'react-mui-dropzone';
 import UploadFileIcon from '@mui/icons-material/UploadFile';
 import ArticleIcon from '@mui/icons-material/Article';
 import InsertDriveFileIcon from '@mui/icons-material/InsertDriveFile';
+import { Headers } from '@nymproject/sdk';
 import { ThemeToggle } from './ThemeToggle';
 import { AppContextProvider, useAppContext } from './context';
-import { MixnetContextProvider, parseBinaryMessageHeaders, useMixnetContext } from './context/mixnet';
+import { BinaryMessageHeaders, MixnetContextProvider, useMixnetContext } from './context/mixnet';
 
 export const AppTheme: React.FC = ({ children }) => {
   const { mode } = useAppContext();
@@ -45,6 +51,7 @@ interface Log {
   fileDownloadUrl?: string;
   filesize?: number;
   timestamp: Date;
+  headers?: Headers;
 }
 
 interface UploadState {
@@ -52,11 +59,48 @@ interface UploadState {
   files: File[];
 }
 
+const ClientAddress: React.FC<{ label?: string; tooltip?: string; address?: string }> = ({
+  label,
+  address,
+  tooltip,
+}) => {
+  const copy = useClipboard();
+
+  if (!address) {
+    return <Chip label="Anonymous" icon={<VisibilityOffIcon />} />;
+  }
+
+  const addressShort = `${address.slice(0, 24)}...`;
+
+  return (
+    <Tooltip arrow title={tooltip || ''}>
+      <Chip
+        clickable
+        label={
+          label ? (
+            <>
+              <strong>{label}</strong> {addressShort}
+            </>
+          ) : (
+            <>{addressShort}</>
+          )
+        }
+        onClick={() => {
+          if (address) {
+            copy.copy(address);
+          }
+        }}
+        icon={<ContentCopyIcon />}
+      />
+    </Tooltip>
+  );
+};
+
 export const Content: React.FC = () => {
   const theme = useTheme();
   const { isReady, address, connect, events, sendTextMessage, sendBinaryMessage } = useMixnetContext();
-  const copy = useClipboard();
 
+  const [revealSenderAddress, setRevealSenderAddress] = React.useState(false);
   const [sendToSelf, setSendToSelf] = React.useState(false);
   const [recipient, setRecipient] = React.useState<string>();
   const handleRecipientChange = (event: React.ChangeEvent<HTMLInputElement>) => {
@@ -94,13 +138,8 @@ export const Content: React.FC = () => {
 
   React.useEffect(() => {
     if (isReady) {
-      // // mixnet v1
-      // const validatorApiUrl = 'https://validator.nymtech.net/api';
-      // const preferredGatewayIdentityKey = 'E3mvZTHQCdBvhfr178Swx9g4QG3kkRUun7YnToLMcMbM';
-
-      // mixnet v2
-      const validatorApiUrl = 'https://qwerty-validator-api.qa.nymte.ch/api'; // "http://localhost:8081";
-      const preferredGatewayIdentityKey = undefined; // '36vfvEyBzo5cWEFbnP7fqgY39kFw9PQhvwzbispeNaxL';
+      const validatorApiUrl = 'https://validator.nymtech.net/api';
+      const preferredGatewayIdentityKey = 'E3mvZTHQCdBvhfr178Swx9g4QG3kkRUun7YnToLMcMbM';
 
       connect({
         clientId: 'Example Client',
@@ -117,6 +156,7 @@ export const Content: React.FC = () => {
           kind: 'rx',
           timestamp: new Date(),
           message: e.args.payload,
+          headers: e.args.headers,
         });
         setLogTrigger(Date.now());
       });
@@ -142,8 +182,12 @@ export const Content: React.FC = () => {
   React.useEffect(() => {
     if (events) {
       const unsubcribe = events.subscribeToBinaryMessageReceivedEvent((e) => {
-        // the headers will be JSON (see the mixnet context for how they are created), so parse them
-        const headers = parseBinaryMessageHeaders(e.args.headers);
+        if (!e.args.headers) {
+          console.error('Expected headers, got undefined 😢', e.args);
+          return;
+        }
+
+        const headers = e.args.headers as BinaryMessageHeaders;
 
         const blob = new Blob([new Uint8Array(e.args.payload)], { type: headers.mimeType });
         log.current.push({
@@ -152,6 +196,7 @@ export const Content: React.FC = () => {
           filename: headers.filename,
           fileDownloadUrl: URL.createObjectURL(blob),
           filesize: e.args.payload.length,
+          headers: e.args.headers,
         });
         setLogTrigger(Date.now());
       });
@@ -184,7 +229,8 @@ export const Content: React.FC = () => {
       message,
     });
     setLogTrigger(Date.now());
-    await sendTextMessage({ payload: message, recipient });
+    const senderAddress = revealSenderAddress ? address : undefined;
+    await sendTextMessage({ payload: message, recipient, headers: { senderAddress } });
 
     await Promise.all(
       files.map(async (f) => {
@@ -200,7 +246,7 @@ export const Content: React.FC = () => {
           return await sendBinaryMessage({
             payload: new Uint8Array(buffer),
             recipient,
-            headers: { filename: f.name, mimeType: f.type },
+            headers: { filename: f.name, mimeType: f.type, senderAddress },
           });
         } catch (e) {
           addErrorLog('Failed to send file', f.name);
@@ -249,20 +295,7 @@ export const Content: React.FC = () => {
           ) : (
             <>
               <Chip color="success" icon={<CheckCircleIcon />} label="Connected" variant="outlined" />
-              {address && (
-                <Tooltip arrow title="Copy your client address to the clipboard">
-                  <Chip
-                    clickable
-                    label={`${address.slice(0, 24)}...`}
-                    onClick={() => {
-                      if (address) {
-                        copy.copy(address);
-                      }
-                    }}
-                    icon={<ContentCopyIcon />}
-                  />
-                </Tooltip>
-              )}
+              <ClientAddress address={address} tooltip="Copy your client address to the clipboard" />
             </>
           )}
         </Stack>
@@ -347,9 +380,34 @@ export const Content: React.FC = () => {
               />
             </Box>
 
-            <Button variant="contained" sx={{ width: 100 }} onClick={handleSend}>
-              Send
-            </Button>
+            <Stack direction="row" spacing={2}>
+              <Button variant="contained" sx={{ width: 100 }} onClick={handleSend}>
+                Send
+              </Button>
+              <FormGroup>
+                <FormControlLabel
+                  control={
+                    <Switch
+                      color={revealSenderAddress ? 'warning' : 'default'}
+                      onClick={() => setRevealSenderAddress((prevState) => !prevState)}
+                    />
+                  }
+                  label={
+                    revealSenderAddress ? (
+                      <Stack direction="row" spacing={1}>
+                        <VisibilityIcon color="warning" />
+                        <Typography color={theme.palette.warning.main}>Reveal your address to the recipient</Typography>
+                      </Stack>
+                    ) : (
+                      <Stack direction="row" spacing={1}>
+                        <VisibilityOffIcon />
+                        <Typography>Hide your address from the recipient</Typography>
+                      </Stack>
+                    )
+                  }
+                />
+              </FormGroup>
+            </Stack>
           </Stack>
         )}
       </Box>
@@ -398,6 +456,16 @@ export const Content: React.FC = () => {
                 )}
               </>
             )}
+            {item.kind === 'rx' &&
+              (item.headers?.senderAddress ? (
+                <ClientAddress
+                  label="Sender"
+                  tooltip="Click to copy the message sender's address"
+                  address={item.headers?.senderAddress}
+                />
+              ) : (
+                <ClientAddress label="Sender" />
+              ))}
           </Stack>
         </Box>
       ))}

sdk/typescript/examples/react-webpack-with-theme-example/src/context/mixnet.tsx

@@ -1,14 +1,11 @@
 import * as React from 'react';
-import { createNymMixnetClient, IWebWorkerEvents, NymClientConfig, NymMixnetClient } from '@nymproject/sdk';
+import { createNymMixnetClient, IWebWorkerEvents, NymClientConfig, NymMixnetClient, Headers } from '@nymproject/sdk';
 
-export interface BinaryMessageHeaders {
+export interface BinaryMessageHeaders extends Headers {
   filename: string;
   mimeType: string;
 }
 
-export const parseBinaryMessageHeaders = (headers: string): BinaryMessageHeaders =>
-  JSON.parse(headers) as BinaryMessageHeaders;
-
 interface State {
   // data
   isReady: boolean;
@@ -17,7 +14,7 @@ interface State {
 
   // methods
   connect: (config: NymClientConfig) => Promise<void>;
-  sendTextMessage: (args: { payload: string; recipient: string }) => Promise<void>;
+  sendTextMessage: (args: { payload: string; recipient: string; headers?: Headers }) => Promise<void>;
   sendBinaryMessage: (args: { payload: Uint8Array; recipient: string; headers: BinaryMessageHeaders }) => Promise<void>;
 }
 
@@ -62,7 +59,7 @@ export const MixnetContextProvider: React.FC = ({ children }) => {
     await nym.current.client.start(config);
   };
 
-  const sendTextMessage = async (args: { payload: string; recipient: string }) => {
+  const sendTextMessage = async (args: { payload: string; recipient: string; headers?: Headers }) => {
     if (!nym.current?.client) {
       console.error('Nym client has not initialised. Please wrap in useEffect on `isReady` prop of this context.');
       return;
@@ -76,8 +73,7 @@ export const MixnetContextProvider: React.FC = ({ children }) => {
       return;
     }
     // convert headers to JSON
-    const sendArgs = { ...args, headers: JSON.stringify(args.headers) };
-    await nym.current.client.sendBinaryMessage(sendArgs);
+    await nym.current.client.sendBinaryMessage(args);
   };
 
   const value = React.useMemo<State>(

sdk/typescript/packages/sdk/src/mixnet/wasm/types.ts

@@ -27,7 +27,7 @@ export interface NymClientConfig {
    * Optional. The identity key of the preferred gateway to connect to.
    */
   preferredGatewayIdentityKey?: string;
-  
+
   /**
    * Optional. The listener websocket of the preferred gateway to connect to.
    */
@@ -39,11 +39,16 @@ export interface NymClientConfig {
   debug?: wasm_bindgen.Debug;
 }
 
+export interface Headers {
+  senderAddress?: string;
+  [key: string]: unknown;
+}
+
 export interface IWebWorker {
   start: (config: NymClientConfig) => void;
   selfAddress: () => string | undefined;
-  sendMessage: (args: { payload: string; recipient: string }) => void;
-  sendBinaryMessage: (args: { payload: Uint8Array; recipient: string; headers?: string }) => void;
+  sendMessage: (args: { payload: string; recipient: string; headers?: Headers }) => void;
+  sendBinaryMessage: (args: { payload: Uint8Array; recipient: string; headers?: Headers }) => void;
 }
 
 export enum EventKinds {
@@ -72,6 +77,7 @@ export interface StringMessageReceivedEvent {
   args: {
     kind: number;
     payload: string;
+    headers?: Headers;
   };
 }
 
@@ -80,7 +86,7 @@ export interface BinaryMessageReceivedEvent {
   args: {
     kind: number;
     payload: Uint8Array;
-    headers: string;
+    headers?: Headers;
   };
 }
 

sdk/typescript/packages/sdk/src/mixnet/wasm/worker.ts

@@ -16,6 +16,7 @@ import type {
   StringMessageReceivedEvent,
   BinaryMessageReceivedEvent,
   NymClientConfig,
+  Headers,
 } from './types';
 import { EventKinds } from './types';
 
@@ -91,12 +92,13 @@ class ClientWrapper {
     this.client = await this.client.start();
   };
 
-  sendMessage = async ({ payload, recipient }: { recipient: string; payload: string }) => {
+  sendMessage = async ({ payload, recipient, headers }: { recipient: string; payload: string; headers?: Headers }) => {
     if (!this.client) {
       console.error('Client has not been initialised. Please call `init` first.');
       return;
     }
-    const message = wasm_bindgen.create_binary_message_from_string(PAYLOAD_KIND_TEXT, payload);
+    const headersAsJsonString = headers ? JSON.stringify(headers) : '';
+    const message = wasm_bindgen.create_binary_message_from_string(PAYLOAD_KIND_TEXT, payload, headersAsJsonString);
     this.client = await this.client.send_binary_message(message, recipient);
   };
 
@@ -107,13 +109,14 @@ class ClientWrapper {
   }: {
     recipient: string;
     payload: Uint8Array;
-    headers?: string;
+    headers?: Headers;
   }) => {
     if (!this.client) {
       console.error('Client has not been initialised. Please call `init` first.');
       return;
     }
-    const message = wasm_bindgen.create_binary_message_with_headers(PAYLOAD_KIND_BINARY, payload, headers || '');
+    const headersAsJsonString = headers ? JSON.stringify(headers) : '';
+    const message = wasm_bindgen.create_binary_message_with_headers(PAYLOAD_KIND_BINARY, payload, headersAsJsonString);
     this.client = await this.client.send_binary_message(message, recipient);
   };
 }
@@ -133,11 +136,10 @@ wasm_bindgen(wasmUrl)
         config.validatorApiUrl,
         config.preferredGatewayIdentityKey,
       );
-      
+
       // set a different gatewayListener in order to avoid workaround ws over https error
-      if (config.gatewayListener)
-            gatewayEndpoint.gateway_listener  = config.gatewayListener;
-      
+      if (config.gatewayListener) gatewayEndpoint.gateway_listener = config.gatewayListener;
+
       // create the client, passing handlers for events
       wrapper.init(
         new wasm_bindgen.Config(
@@ -153,19 +155,20 @@ wasm_bindgen(wasmUrl)
         async (message) => {
           try {
             const { kind, payload, headers } = await wasm_bindgen.parse_binary_message_with_headers(message);
+            const parsedHeaders = headers?.length > 0 ? JSON.parse(headers) : undefined;
             switch (kind) {
               case PAYLOAD_KIND_TEXT: {
                 const stringMessage = await wasm_bindgen.parse_string_message_with_headers(message);
                 postMessageWithType<StringMessageReceivedEvent>({
                   kind: EventKinds.StringMessageReceived,
-                  args: { kind, payload: stringMessage.payload },
+                  args: { kind, payload: stringMessage.payload, headers: parsedHeaders },
                 });
                 break;
               }
               case PAYLOAD_KIND_BINARY:
                 postMessageWithType<BinaryMessageReceivedEvent>({
                   kind: EventKinds.BinaryMessageReceived,
-                  args: { kind, payload, headers: headers || '' },
+                  args: { kind, payload, headers: parsedHeaders },
                 });
                 break;
               default: