Embed logo in Outlook drafts

web/src/components/admin/AdminEmail.jsx

@@ -66,14 +66,19 @@ export function EmailCreatorTab() {
     }
   };
 
-  const downloadOutlook = () => {
+  const downloadOutlook = async () => {
     const slug = form.subject.normalize('NFD').replace(/[\u0300-\u036f]/g, '').replace(/[^a-zA-Z0-9]+/g, '-').replace(/^-|-$/g, '').toLowerCase() || 'email';
-    downloadOutlookDraft({
-      subject: form.subject,
-      html: data.html,
-      filename: `${slug}-outlook.eml`,
-    });
-    flash('outlook');
+    try {
+      setError('');
+      await downloadOutlookDraft({
+        subject: form.subject,
+        html: data.html,
+        filename: `${slug}-outlook.eml`,
+      });
+      flash('outlook');
+    } catch (err) {
+      setError(err.message || "Impossible de créer le brouillon Outlook.");
+    }
   };
 
   const download = () => {

web/src/components/admin/AdminTabs.jsx

@@ -393,14 +393,19 @@ function EmailModal({ renc, onClose }) {
     }
   };
 
-  const downloadOutlook = () => {
+  const downloadOutlook = async () => {
     const slug = renc.titre.normalize('NFD').replace(/[̀-ͯ]/g, '').replace(/[^a-zA-Z0-9]+/g, '-').toLowerCase();
-    downloadOutlookDraft({
-      subject: data.subject,
-      html: data.html,
-      filename: `invitation-${slug}-outlook.eml`,
-    });
-    flash('outlook');
+    try {
+      setError('');
+      await downloadOutlookDraft({
+        subject: data.subject,
+        html: data.html,
+        filename: `invitation-${slug}-outlook.eml`,
+      });
+      flash('outlook');
+    } catch (err) {
+      setError(err.message || "Impossible de créer le brouillon Outlook.");
+    }
   };
 
   const download = () => {

web/src/lib/outlookDraft.js

@@ -1,5 +1,7 @@
-function utf8Base64(value) {
-  const bytes = new TextEncoder().encode(String(value ?? ''));
+const LOGO_CID = 'sbc-business-club-logo';
+const MIME_BOUNDARY = '----=_SBC_Outlook_Draft_Logo';
+
+function bytesBase64(bytes) {
   let binary = '';
 
   for (let offset = 0; offset < bytes.length; offset += 0x8000) {
@@ -9,27 +11,70 @@ function utf8Base64(value) {
   return globalThis.btoa(binary);
 }
 
+function utf8Base64(value) {
+  return bytesBase64(new TextEncoder().encode(String(value ?? '')));
+}
+
 function wrapBase64(value) {
   return value.match(/.{1,76}/g)?.join('\r\n') ?? '';
 }
 
-export function buildOutlookDraftMime({ subject, html }) {
+function logoSource(html) {
+  return String(html).match(/\bsrc=["']([^"']*\/assets\/logo\.jpg(?:\?[^"']*)?)["']/i)?.[1] || '/assets/logo.jpg';
+}
+
+function useInlineLogo(html) {
+  return String(html).replace(
+    /(\bsrc\s*=\s*)(["'])(?:https?:\/\/[^"']+)?\/assets\/logo\.jpg(?:\?[^"']*)?\2/gi,
+    (_match, prefix, quote) => `${prefix}${quote}cid:${LOGO_CID}${quote}`,
+  );
+}
+
+export function buildOutlookDraftMime({ subject, html, logoBase64 = '' }) {
   // X-Unsent asks Outlook to open the MIME message as a message to compose.
   // Loading HTML as a real MIME body bypasses Outlook's destructive paste merge.
+  if (!logoBase64) {
+    return [
+      'X-Unsent: 1',
+      `Subject: =?UTF-8?B?${utf8Base64(subject)}?=`,
+      'MIME-Version: 1.0',
+      'Content-Type: text/html; charset=UTF-8',
+      'Content-Transfer-Encoding: base64',
+      '',
+      wrapBase64(utf8Base64(html)),
+      '',
+    ].join('\r\n');
+  }
+
   return [
     'X-Unsent: 1',
     `Subject: =?UTF-8?B?${utf8Base64(subject)}?=`,
     'MIME-Version: 1.0',
+    `Content-Type: multipart/related; type="text/html"; boundary="${MIME_BOUNDARY}"`,
+    '',
+    `--${MIME_BOUNDARY}`,
     'Content-Type: text/html; charset=UTF-8',
     'Content-Transfer-Encoding: base64',
     '',
-    wrapBase64(utf8Base64(html)),
+    wrapBase64(utf8Base64(useInlineLogo(html))),
+    `--${MIME_BOUNDARY}`,
+    'Content-Type: image/jpeg; name="logo.jpg"',
+    'Content-Transfer-Encoding: base64',
+    `Content-ID: <${LOGO_CID}>`,
+    'Content-Disposition: inline; filename="logo.jpg"',
+    '',
+    wrapBase64(logoBase64),
+    `--${MIME_BOUNDARY}--`,
     '',
   ].join('\r\n');
 }
 
-export function downloadOutlookDraft({ subject, html, filename }) {
-  const mime = buildOutlookDraftMime({ subject, html });
+export async function downloadOutlookDraft({ subject, html, filename }) {
+  const response = await fetch(logoSource(html), { cache: 'force-cache' });
+  if (!response.ok) throw new Error("Le logo de l'e-mail n'a pas pu être chargé.");
+
+  const logoBase64 = bytesBase64(new Uint8Array(await response.arrayBuffer()));
+  const mime = buildOutlookDraftMime({ subject, html, logoBase64 });
   const blob = new Blob([mime], { type: 'message/rfc822' });
   const url = URL.createObjectURL(blob);
   const anchor = document.createElement('a');