feat(file-explorer): add file download with share sheet support

packages/server/src/server/bootstrap.ts

@@ -89,6 +89,9 @@ export async function createPaseoDaemon(
     realm: authRealm,
   });
   app.use((req, res, next) => {
+    if (req.path === "/api/files/download") {
+      return next();
+    }
     if (agentMcpBearerToken && req.path.startsWith(agentMcpRoute)) {
       const authHeader = req.header("authorization") ?? "";
       if (authHeader.startsWith("Bearer ")) {

packages/server/src/server/file-explorer/service.ts

@@ -56,6 +56,12 @@ const TEXT_EXTENSIONS = new Set([
   ".sh",
 ]);
 
+const TEXT_MIME_TYPES: Record<string, string> = {
+  ".json": "application/json",
+};
+
+const DEFAULT_TEXT_MIME_TYPE = "text/plain";
+
 const IMAGE_MIME_TYPES: Record<string, string> = {
   ".png": "image/png",
   ".jpg": "image/jpeg",
@@ -140,7 +146,7 @@ export async function readExplorerFile({
       kind: "text",
       encoding: "utf-8",
       content,
-      mimeType: "text/plain",
+      mimeType: TEXT_MIME_TYPES[ext] ?? DEFAULT_TEXT_MIME_TYPE,
     };
   }
 
@@ -182,7 +188,7 @@ export async function getDownloadableFileInfo({
 
   const ext = path.extname(filePath).toLowerCase();
   const mimeType = TEXT_EXTENSIONS.has(ext)
-    ? "text/plain"
+    ? TEXT_MIME_TYPES[ext] ?? DEFAULT_TEXT_MIME_TYPE
     : ext in IMAGE_MIME_TYPES
       ? IMAGE_MIME_TYPES[ext]
       : "application/octet-stream";

packages/server/src/server/messages.ts

@@ -487,6 +487,7 @@ export const FileDownloadTokenRequestSchema = z.object({
   type: z.literal("file_download_token_request"),
   agentId: z.string(),
   path: z.string(),
+  requestId: z.string().optional(),
 });
 
 export const ClearAgentAttentionMessageSchema = z.object({
@@ -761,6 +762,7 @@ export const FileDownloadTokenResponseSchema = z.object({
     mimeType: z.string().nullable(),
     size: z.number().nullable(),
     error: z.string().nullable(),
+    requestId: z.string().optional(),
   }),
 });
 

packages/server/src/server/session.ts

@@ -2098,7 +2098,7 @@ export class Session {
   private async handleFileDownloadTokenRequest(
     request: FileDownloadTokenRequest
   ): Promise<void> {
-    const { agentId, path: requestedPath } = request;
+    const { agentId, path: requestedPath, requestId } = request;
 
     console.log(
       `[Session ${this.clientId}] Handling file download token request for agent ${agentId} (${requestedPath})`
@@ -2119,6 +2119,7 @@ export class Session {
             mimeType: null,
             size: null,
             error: `Agent not found: ${agentId}`,
+            ...(requestId ? { requestId } : {}),
           },
         });
         return;
@@ -2148,6 +2149,7 @@ export class Session {
           mimeType: entry.mimeType,
           size: entry.size,
           error: null,
+          ...(requestId ? { requestId } : {}),
         },
       });
     } catch (error: any) {
@@ -2165,6 +2167,7 @@ export class Session {
           mimeType: null,
           size: null,
           error: error.message,
+          ...(requestId ? { requestId } : {}),
         },
       });
     }