Adding audio wav file for Captcha using espeak.

docker/dev/Dockerfile

@@ -41,6 +41,9 @@ FROM alpine:3.12
 # Install libpq for postgres
 RUN apk add libpq
 
+# Install Espeak for captchas
+RUN apk add espeak
+
 # Copy resources
 COPY server/config/defaults.hjson /config/defaults.hjson
 COPY --from=rust /app/server/target/x86_64-unknown-linux-musl/debug/lemmy_server /app/lemmy

docker/prod/Dockerfile

@@ -50,6 +50,10 @@ FROM alpine:3.12 as lemmy
 
 # Install libpq for postgres
 RUN apk add libpq
+
+# Install Espeak for captchas
+RUN apk add espeak
+
 RUN addgroup -g 1000 lemmy
 RUN adduser -D -s /bin/sh -u 1000 -G lemmy lemmy
 

docs/src/contributing_websocket_http_api.md

@@ -428,6 +428,7 @@ These expire after 10 minutes.
   op: "GetCaptcha",
   data: {
     png: String, // A Base64 encoded png
+    wav: Option<String>, // A Base64 encoded wav audio file
     uuid: String,
   }
 }

server/src/api/user.rs

@@ -2,6 +2,7 @@ use crate::{
   api::{claims::Claims, is_admin, APIError, Oper, Perform},
   apub::ApubObjectType,
   blocking,
+  captcha_espeak_wav_base64,
   websocket::{
     server::{CaptchaItem, CheckCaptcha, JoinUserRoom, SendAllMessage, SendUserRoomMessage},
     UserOperation,
@@ -79,7 +80,8 @@ pub struct GetCaptcha {}
 
 #[derive(Serialize, Deserialize)]
 pub struct GetCaptchaResponse {
-  png: String, // A Base64 encoded png
+  png: String,         // A Base64 encoded png
+  wav: Option<String>, // A Base64 encoded wav audio
   uuid: String,
 }
 
@@ -513,6 +515,8 @@ impl Perform for Oper<GetCaptcha> {
 
     let uuid = uuid::Uuid::new_v4().to_string();
 
+    let wav = captcha_espeak_wav_base64(&answer).ok();
+
     let captcha_item = CaptchaItem {
       answer,
       uuid: uuid.to_owned(),
@@ -523,7 +527,7 @@ impl Perform for Oper<GetCaptcha> {
       ws.chatserver.do_send(captcha_item);
     }
 
-    Ok(GetCaptchaResponse { png, uuid })
+    Ok(GetCaptchaResponse { png, uuid, wav })
   }
 }
 

server/src/lib.rs

@@ -36,6 +36,7 @@ use actix_web::{client::Client, dev::ConnectionInfo};
 use log::error;
 use percent_encoding::{utf8_percent_encode, NON_ALPHANUMERIC};
 use serde::Deserialize;
+use std::process::Command;
 
 pub type DbPool = diesel::r2d2::Pool<diesel::r2d2::ConnectionManager<diesel::PgConnection>>;
 pub type ConnectionId = usize;
@@ -213,9 +214,56 @@ where
   Ok(res)
 }
 
+pub fn captcha_espeak_wav_base64(captcha: &str) -> Result<String, LemmyError> {
+  let mut built_text = String::new();
+
+  // Building proper speech text for espeak
+  for mut c in captcha.chars() {
+    let new_str = if c.is_alphabetic() {
+      if c.is_lowercase() {
+        c.make_ascii_uppercase();
+        format!("lower case {} ... ", c)
+      } else {
+        c.make_ascii_uppercase();
+        format!("capital {} ... ", c)
+      }
+    } else {
+      format!("{} ...", c)
+    };
+
+    built_text.push_str(&new_str);
+  }
+
+  espeak_wav_base64(&built_text)
+}
+
+pub fn espeak_wav_base64(text: &str) -> Result<String, LemmyError> {
+  // Make a temp file path
+  let uuid = uuid::Uuid::new_v4().to_string();
+  let file_path = format!("/tmp/lemmy_espeak_{}.wav", &uuid);
+
+  // Write the wav file
+  Command::new("espeak")
+    .arg("-w")
+    .arg(&file_path)
+    .arg(text)
+    .status()?;
+
+  // Read the wav file bytes
+  let bytes = std::fs::read(&file_path)?;
+
+  // Delete the file
+  std::fs::remove_file(file_path)?;
+
+  // Convert to base64
+  let base64 = base64::encode(bytes);
+
+  Ok(base64)
+}
+
 #[cfg(test)]
 mod tests {
-  use crate::is_image_content_type;
+  use crate::{captcha_espeak_wav_base64, is_image_content_type};
 
   #[test]
   fn test_image() {
@@ -230,6 +278,11 @@ mod tests {
     });
   }
 
+  #[test]
+  fn test_espeak() {
+    assert!(captcha_espeak_wav_base64("WxRt2l").is_ok())
+  }
+
   // These helped with testing
   // #[test]
   // fn test_iframely() {

ui/src/components/login.tsx

@@ -49,6 +49,7 @@ export class Login extends Component<any, State> {
     captcha: {
       png: undefined,
       uuid: undefined,
+      wav: undefined,
     },
   };
 
@@ -136,11 +137,7 @@ export class Login extends Component<any, State> {
             <label class="col-sm-2" htmlFor="login-captcha">
               {i18n.t('enter_code')}
             </label>
-            <div class="col-sm-4">
-              {this.state.captcha.uuid && (
-                <img class="rounded img-fluid" src={this.captchaSrc()} />
-              )}
-            </div>
+            {this.showCaptcha()}
             <div class="col-sm-6">
               <input
                 type="text"
@@ -169,6 +166,7 @@ export class Login extends Component<any, State> {
       </div>
     );
   }
+
   registerForm() {
     return (
       <form onSubmit={linkEvent(this, this.handleRegisterSubmit)}>
@@ -259,11 +257,7 @@ export class Login extends Component<any, State> {
           <label class="col-sm-2" htmlFor="register-captcha">
             {i18n.t('enter_code')}
           </label>
-          <div class="col-sm-4">
-            {this.state.captcha.uuid && (
-              <img class="rounded img-fluid" src={this.captchaSrc()} />
-            )}
-          </div>
+          {this.showCaptcha()}
           <div class="col-sm-6">
             <input
               type="text"
@@ -310,6 +304,34 @@ export class Login extends Component<any, State> {
     );
   }
 
+  showCaptcha() {
+    return (
+      <div class="col-sm-4">
+        {this.state.captcha.uuid && (
+          <>
+            <img
+              class="rounded-top img-fluid"
+              src={this.captchaPngSrc()}
+              style="border-bottom-right-radius: 0; border-bottom-left-radius: 0;"
+            />
+            {this.state.captcha.wav && (
+              <button
+                class="rounded-bottom btn btn-sm btn-secondary btn-block"
+                style="border-top-right-radius: 0; border-top-left-radius: 0;"
+                title={i18n.t('play_captcha_audio')}
+                onClick={linkEvent(this, this.handleCaptchaPlay)}
+              >
+                <svg class="icon icon-play">
+                  <use xlinkHref="#icon-play"></use>
+                </svg>
+              </button>
+            )}
+          </>
+        )}
+      </div>
+    );
+  }
+
   handleLoginSubmit(i: Login, event: any) {
     event.preventDefault();
     i.state.loginLoading = true;
@@ -380,7 +402,13 @@ export class Login extends Component<any, State> {
     WebSocketService.Instance.passwordReset(resetForm);
   }
 
-  captchaSrc() {
+  handleCaptchaPlay(i: Login) {
+    event.preventDefault();
+    let snd = new Audio('data:audio/wav;base64,' + i.state.captcha.wav);
+    snd.play();
+  }
+
+  captchaPngSrc() {
     return `data:image/png;base64,${this.state.captcha.png}`;
   }
 
@@ -412,7 +440,7 @@ export class Login extends Component<any, State> {
         this.state.captcha = data;
         this.state.loginForm.captcha_uuid = data.uuid;
         this.state.registerForm.captcha_uuid = data.uuid;
-        this.setState({ captcha: data });
+        this.setState(this.state);
       } else if (res.op == UserOperation.PasswordReset) {
         toast(i18n.t('reset_password_mail_sent'));
       } else if (res.op == UserOperation.GetSite) {

ui/src/interfaces.ts

@@ -566,6 +566,7 @@ export interface RegisterForm {
 
 export interface GetCaptchaResponse {
   png: string;
+  wav?: string;
   uuid: string;
 }
 

ui/translations/en.json

@@ -283,5 +283,6 @@
     "cake_day_title": "Cake day:",
     "cake_day_info": "It's {{ creator_name }}'s cake day today!",
     "invalid_post_title": "Invalid post title",
-    "invalid_url": "Invalid URL."
+    "invalid_url": "Invalid URL.",
+    "play_captcha_audio": "Play Captcha Audio"
 }