show image thumbnails and pdf filenames in chat, allow for fileuploads with no text message

src/components/thread/index.tsx

@@ -37,10 +37,7 @@ import {
   TooltipProvider,
   TooltipTrigger,
 } from "../ui/tooltip";
-import {
-  fileToImageBlock,
-  fileToPDFBlock,
-} from "@/lib/multimodal-utils";
+import { fileToImageBlock, fileToPDFBlock } from "@/lib/multimodal-utils";
 import type { Base64ContentBlock } from "@langchain/core/messages";
 
 function StickyToBottomContent(props: {
@@ -176,18 +173,17 @@ export function Thread() {
 
   const handleSubmit = (e: FormEvent) => {
     e.preventDefault();
-    if (!input.trim() || isLoading) return;
+    if ((input.trim().length === 0 && imageUrlList.length === 0 && pdfUrlList.length === 0) || isLoading) return;
     setFirstTokenReceived(false);
 
     // TODO: check configurable object for modelname camelcase or snakecase else do openai format
     const isOpenAI = true;
 
-
     const newHumanMessage: Message = {
       id: uuidv4(),
       type: "human",
       content: [
-        { type: "text", text: input },
+        ...(input.trim().length > 0 ? [{ type: "text", text: input }] : []),
         ...pdfUrlList,
         ...imageUrlList,
       ] as Message["content"],
@@ -220,10 +216,15 @@ export function Thread() {
     const files = e.target.files;
     if (!files) return;
     const fileArray = Array.from(files);
-    const imageFiles = fileArray.filter((file) => file.type.startsWith("image"));
-    const pdfFiles = fileArray.filter((file) => file.type === "application/pdf");
+    const imageFiles = fileArray.filter((file) =>
+      file.type.startsWith("image"),
+    );
+    const pdfFiles = fileArray.filter(
+      (file) => file.type === "application/pdf",
+    );
     const invalidFiles = fileArray.filter(
-      (file) => !file.type.startsWith("image/") && file.type !== "application/pdf",
+      (file) =>
+        !file.type.startsWith("image/") && file.type !== "application/pdf",
     );
 
     if (invalidFiles.length > 0) {
@@ -638,7 +639,7 @@ export function Thread() {
                         <Button
                           type="submit"
                           className="shadow-md transition-all"
-                          disabled={isLoading || !input.trim()}
+                          disabled={isLoading || (!input.trim() && imageUrlList.length === 0 && pdfUrlList.length === 0)}
                         >
                           Send
                         </Button>

src/components/thread/messages/human.tsx

@@ -86,20 +86,69 @@ export function HumanMessage({
           />
         ) : (
           <div className="flex flex-col gap-2">
-            {contentImageUrls.length > 0 && (
-              <div className="flex flex-wrap justify-end gap-2">
-                {contentImageUrls.map((imageUrl) => (
+            {/* Render images and files if no text */}
+            {Array.isArray(message.content) && message.content.length > 0 && (
+              <div className="flex flex-col gap-2 items-end">
+                {message.content.map((block, idx) => {
+                  // Type guard for image block
+                  const isImageBlock =
+                    typeof block === "object" &&
+                    block !== null &&
+                    "type" in block &&
+                    (block as any).type === "image" &&
+                    "source_type" in block &&
+                    (block as any).source_type === "base64" &&
+                    "mime_type" in block &&
+                    "data" in block;
+                  if (isImageBlock) {
+                    const imgBlock = block as {
+                      type: string;
+                      source_type: string;
+                      mime_type: string;
+                      data: string;
+                      metadata?: { name?: string };
+                    };
+                    const url = `data:${imgBlock.mime_type};base64,${imgBlock.data}`;
+                    return (
                       <img
-                    src={imageUrl}
-                    alt="uploaded image"
+                        key={idx}
+                        src={url}
+                        alt={imgBlock.metadata?.name || "uploaded image"}
                         className="bg-muted h-16 w-16 rounded-md object-cover"
                       />
-                ))}
+                    );
+                  }
+                  // Type guard for file block (PDF)
+                  const isPdfBlock =
+                    typeof block === "object" &&
+                    block !== null &&
+                    "type" in block &&
+                    (block as any).type === "file" &&
+                    "mime_type" in block &&
+                    (block as any).mime_type === "application/pdf";
+                  if (isPdfBlock) {
+                    const pdfBlock = block as {
+                      metadata?: { filename?: string; name?: string };
+                    };
+                    return (
+                      <div
+                        key={idx}
+                        className="bg-muted ml-auto w-fit rounded-3xl px-4 py-2 text-right whitespace-pre-wrap"
+                      >
+                        {pdfBlock.metadata?.filename || pdfBlock.metadata?.name || "PDF file"}
+                      </div>
+                    );
+                  }
+                  return null;
+                })}
               </div>
             )}
+            {/* Render text if present, otherwise fallback to file/image name */}
+            {contentString && contentString !== "Other" && contentString !== "Multimodal message" ? (
               <p className="bg-muted ml-auto w-fit rounded-3xl px-4 py-2 text-right whitespace-pre-wrap">
                 {contentString}
               </p>
+            ) : null}
           </div>
         )}
 

src/lib/multimodal-utils.ts

@@ -5,12 +5,7 @@ import { convertToOpenAIImageBlock } from "@langchain/core/messages";
 export async function fileToImageBlock(
   file: File,
 ): Promise<Base64ContentBlock> {
-  const supportedTypes = [
-    "image/jpeg",
-    "image/png",
-    "image/gif",
-    "image/webp",
-  ];
+  const supportedTypes = ["image/jpeg", "image/png", "image/gif", "image/webp"];
   if (!supportedTypes.includes(file.type)) {
     throw new Error(
       `Unsupported image type: ${file.type}. Supported types are: ${supportedTypes.join(", ")}`,