#6135 Fix: Signature accidentally attaches to email issue

extension/chrome/elements/compose-modules/compose-input-module.ts

@@ -67,7 +67,8 @@ export class ComposeInputModule extends ViewModule<ComposeView> {
   public extract = (type: 'text' | 'html', elSel: 'input_text' | 'input_intro', flag?: 'SKIP-ADDONS') => {
     let html = this.view.S.cached(elSel)[0].innerHTML;
     if (elSel === 'input_text' && flag !== 'SKIP-ADDONS') {
-      html += this.view.quoteModule.getTripleDotSanitizedFormattedHtmlContent();
+      // skipFooter: true because footer is already rendered in input when user changes sender alias (issue #6135)
+      html += this.view.quoteModule.getTripleDotSanitizedFormattedHtmlContent(true);
     }
     if (type === 'html') {
       return Xss.htmlSanitizeKeepBasicTags(html, 'IMG-KEEP');

extension/chrome/elements/compose-modules/compose-quote-module.ts

@@ -23,12 +23,24 @@ export class ComposeQuoteModule extends ViewModule<ComposeView> {
   public tripleDotSanitizedHtmlContent: { quote: string | undefined; footer: string | undefined } | undefined;
   public messageToReplyOrForward: MessageToReplyOrForward | undefined;
 
-  public getTripleDotSanitizedFormattedHtmlContent = (): string => {
-    // email content order: [myMsg, myFooter, theirQuote]
-    if (this.tripleDotSanitizedHtmlContent) {
-      return '<br />' + (this.tripleDotSanitizedHtmlContent.footer || '') + (this.tripleDotSanitizedHtmlContent.quote || '');
+  /**
+   * Returns the formatted HTML content for the triple-dot expandable section.
+   * Email content order: [myMsg, myFooter, theirQuote]
+   *
+   * @param skipFooter - If true, skip including the footer when there's no quote.
+   *                     Used to prevent duplicate signatures when footer was already
+   *                     rendered in input (issue #6135).
+   */
+  public getTripleDotSanitizedFormattedHtmlContent = (skipFooter = false): string => {
+    if (!this.tripleDotSanitizedHtmlContent) {
+      return '';
     }
-    return '';
+    const { footer, quote } = this.tripleDotSanitizedHtmlContent;
+    // When skipFooter is true and there's no quote, return empty to avoid duplicate footer
+    if (skipFooter && !quote) {
+      return '';
+    }
+    return '<br />' + (footer || '') + (quote || '');
   };
 
   public addSignatureToInput = async () => {

test/source/mock/google/strategies/send-message-strategy.ts

@@ -318,11 +318,32 @@ class PlainTextMessageTestStrategy implements ITestMsgStrategy {
   };
 }
 
+
 class NoopTestStrategy implements ITestMsgStrategy {
   // eslint-disable-next-line @typescript-eslint/no-empty-function
   public test = async () => {};
 }
 
+class SignatureRemovalTestStrategy implements ITestMsgStrategy {
+  private readonly signature = 'Test alias signature';
+
+  public test = async (parseResult: ParseMsgResult) => {
+    const mimeMsg = parseResult.mimeMsg;
+    const kisWithPp = await Config.getKeyInfo(['flowcrypt.compatibility.1pp1', 'flowcrypt.compatibility.2pp1']);
+    const encryptedData = mimeMsg.text!;
+    const decrypted = await MsgUtil.decryptMessage({ kisWithPp, encryptedData, verificationPubs: [] });
+    expect(decrypted.success).to.be.true;
+    // We expect the body to contain the message text but NOT the signature
+    const body = decrypted.content?.toUtfStr() || '';
+    if (!body.includes('Message without signature')) {
+      throw new HttpClientErr(`Error: Msg Text doesn't contain expected body. Current: '${body}'`);
+    }
+    if (body.includes(this.signature)) {
+      throw new HttpClientErr(`Error: Msg Text contains signature that should have been removed. Current: '${body}'`);
+    }
+  };
+}
+
 class IncludeQuotedPartTestStrategy implements ITestMsgStrategy {
   private readonly quotedContent: string = [
     'On 2019-06-14 at 23:24, flowcrypt.compatibility@gmail.com wrote:',
@@ -484,6 +505,8 @@ export class TestBySubjectStrategyContext {
       this.strategy = new SaveMessageInStorageStrategy();
     } else if (subject.includes('Test Sending Message With Attachment Which Contains Emoji in Filename')) {
       this.strategy = new SaveMessageInStorageStrategy();
+    } else if (subject.includes('Message without signature')) {
+      this.strategy = new SignatureRemovalTestStrategy();
     } else if (subject.includes('Re: FROM: flowcrypt.compatibility@gmail.com, TO: flowcrypt.compatibility@gmail.com + vladimir@flowcrypt.com')) {
       this.strategy = new NoopTestStrategy();
     } else {

test/source/tests/compose.ts

@@ -104,6 +104,44 @@ export const defineComposeTests = (testVariant: TestVariant, testWithBrowser: Te
       })
     );
 
+    test(
+      'compose - signature must not reappear after manual removal (issue #6135)',
+      testWithBrowser(async (t, browser) => {
+        const primarySignature = 'Test primary signature';
+        const aliasSignature = 'Test alias signature';
+        const acctAliases = [{
+          ...flowcryptCompatibilityAliasList[0],
+          signature: aliasSignature,
+        }];
+        await BrowserRecipe.setupCommonAcctWithAttester(t, browser, 'compatibility', {
+          google: { acctAliases, acctPrimarySignature: primarySignature },
+          attester: { includeHumanKey: true },
+        });
+
+        const composePage = await ComposePageRecipe.openStandalone(t, browser, 'compatibility');
+        // Select alias email to trigger signature change
+        await ComposePageRecipe.selectFromOption(composePage, 'flowcryptcompatibility@gmail.com');
+        let emailBody = await composePage.read('@input-body');
+        expect(emailBody).to.contain(aliasSignature);
+
+        // meaningful user change: delete the signature
+        // clearInput is not available, so we select all and delete
+        await composePage.waitAndClick('@input-body');
+        await composePage.page.keyboard.down('Control');
+        await composePage.page.keyboard.press('a');
+        await composePage.page.keyboard.up('Control');
+        await composePage.page.keyboard.press('Backspace');
+        await ComposePageRecipe.fillMsg(composePage, { to: 'human@flowcrypt.com' }, 'Message without signature', 'Message without signature');
+
+        // Verify signature is gone before sending
+        emailBody = await composePage.read('@input-body');
+        expect(emailBody).to.not.contain(aliasSignature);
+
+        // Send
+        await ComposePageRecipe.sendAndClose(composePage);
+      })
+    );
+
     test(
       'compose - check for sender [flowcrypt.compatibility@gmail.com] from a password-protected email',
       testWithBrowser(async (t, browser) => {