upload and thumbnail fix

functions/src/upload.js

@@ -201,7 +201,8 @@ exports.uploadProjectMedia = onCall(
             detectedContentType = meta?.contentType || "";
           } catch {}
         }
-        const ext = path.extname(sourcePath) || guessExtension(detectedContentType);
+        const ext =
+          path.extname(sourcePath) || guessExtension(detectedContentType);
         inputPath = `${baseInputPath}${ext || ""}`;
         await sourceFile.download({ destination: inputPath });
         const { size } = await fs.stat(inputPath);
@@ -228,7 +229,9 @@ exports.uploadProjectMedia = onCall(
         } else if (/^https?:\/\//i.test(uri)) {
           const downloaded = await downloadFromHttp(uri);
           buffer = downloaded.buffer;
-          if (!detectedContentType) detectedContentType = downloaded.contentType;
+          if (!detectedContentType) {
+            detectedContentType = downloaded.contentType;
+          }
           const ext = guessExtension(downloaded.contentType);
           inputPath = `${baseInputPath}${ext}`;
           logger.info("[uploadProjectMedia] Downloaded remote resource", {
@@ -288,8 +291,13 @@ exports.uploadProjectMedia = onCall(
 
       const downloadToken = crypto.randomUUID();
       const sanitizedMetadata = sanitizeMetadata(metadata);
+      // If we are writing the canonical playback file, make sure contentType is correct
+      const forceVideoMp4 = /\/playback\.mp4$/i.test(storagePath);
+      const effectiveContentType = forceVideoMp4
+        ? "video/mp4"
+        : finalContentType;
       const uploadMetadata = {
-        contentType: finalContentType,
+        contentType: effectiveContentType,
         cacheControl: "public,max-age=86400",
         metadata: {
           ...sanitizedMetadata,
@@ -302,7 +310,7 @@ exports.uploadProjectMedia = onCall(
       logger.info("[uploadProjectMedia] Uploading to bucket", {
         projectId,
         storagePath,
-        finalContentType,
+        finalContentType: effectiveContentType,
         finalSize,
       });
 
@@ -341,13 +349,13 @@ exports.uploadProjectMedia = onCall(
       logger.info("✅ [uploadProjectMedia] Upload terminé", {
         projectId,
         storagePath,
-        contentType: finalContentType,
+        contentType: effectiveContentType,
       });
 
       return {
         success: true,
         url: fileUrl,
-        contentType: finalContentType,
+        contentType: effectiveContentType,
         storagePath,
         downloadToken,
         sourcePath: hasSourcePath ? sourcePath : null,