fix(buffer): presign uploaded media for 7 days — Buffer fetches assets at publish time

Author: waleedlatif1

apps/docs/content/docs/en/integrations/buffer.mdx

@@ -33,7 +33,7 @@ Create a post in Buffer for a channel — add it to the queue, share it immediat
 | `schedulingType` | string | No | How the post publishes: automatic \(Buffer publishes it, default\) or notification \(you get a mobile reminder\) |
 | `dueAt` | string | No | Publish time as an ISO 8601 timestamp \(required when mode is customScheduled\) |
 | `saveToDraft` | boolean | No | Save the post as a draft instead of scheduling it |
-| `media` | file | No | Image or video to attach — an uploaded file, a file reference from a previous block, or a publicly accessible URL |
+| `media` | file | No | Image or video to attach — an uploaded file, a file reference from a previous block, or a publicly accessible URL. Buffer downloads the media at publish time; uploaded files are shared via a link valid for 7 days, so use a public URL for posts scheduled further out |
 | `mediaType` | string | No | Force the attachment type when it cannot be detected from the file or URL: image or video \(default auto\) |
 | `mediaAltText` | string | No | Alt text for an attached image |
 
@@ -83,7 +83,7 @@ Edit an existing Buffer post — update its text, schedule, or media. Attaching
 | `schedulingType` | string | No | How the post publishes: automatic \(Buffer publishes it, default\) or notification \(you get a mobile reminder\) |
 | `dueAt` | string | No | Publish time as an ISO 8601 timestamp \(required when mode is customScheduled\) |
 | `saveToDraft` | boolean | No | Save the post as a draft instead of scheduling it |
-| `media` | file | No | Image or video to attach — an uploaded file, a file reference from a previous block, or a publicly accessible URL. Replaces existing attachments |
+| `media` | file | No | Image or video to attach — an uploaded file, a file reference from a previous block, or a publicly accessible URL. Buffer downloads the media at publish time; uploaded files are shared via a link valid for 7 days, so use a public URL for posts scheduled further out. Replaces existing attachments |
 | `mediaType` | string | No | Force the attachment type when it cannot be detected from the file or URL: image or video \(default auto\) |
 | `mediaAltText` | string | No | Alt text for an attached image |
 

apps/sim/app/api/tools/buffer/server-utils.ts

@@ -18,6 +18,12 @@ import {
 const VIDEO_EXTENSIONS = ['.mp4', '.mov', '.m4v', '.webm', '.avi']
 const IMAGE_EXTENSIONS = ['.png', '.jpg', '.jpeg', '.gif', '.webp']
 const MEDIA_PROBE_TIMEOUT_MS = 5000
+/**
+ * Buffer fetches asset URLs at publish time, which for queued or scheduled
+ * posts can be days after createPost. Presign stored files for the S3 maximum
+ * of 7 days so scheduled posts within that window can still be published.
+ */
+const MEDIA_PRESIGN_EXPIRY_SECONDS = 7 * 24 * 60 * 60
 
 const CREATE_POST_MUTATION = `
   mutation CreatePost($input: CreatePostInput!) {
@@ -133,6 +139,7 @@ export async function resolveMediaAsset(
     userId,
     requestId,
     logger,
+    presignExpirySeconds: MEDIA_PRESIGN_EXPIRY_SECONDS,
   })
   if (resolution.error || !resolution.fileUrl) {
     return {

apps/sim/lib/uploads/utils/file-utils.server.ts

@@ -49,6 +49,12 @@ export interface ResolveFileInputOptions {
   userId: string
   requestId: string
   logger: Logger
+  /**
+   * Expiry for presigned URLs minted for stored files, in seconds.
+   * Defaults to 5 minutes; raise it only when the external service fetches
+   * the URL later than the current request (e.g. scheduled publishing).
+   */
+  presignExpirySeconds?: number
 }
 
 /**
@@ -62,7 +68,7 @@ export interface ResolveFileInputOptions {
 export async function resolveFileInputToUrl(
   options: ResolveFileInputOptions
 ): Promise<FileResolutionResult> {
-  const { file, filePath, userId, requestId, logger } = options
+  const { file, filePath, userId, requestId, logger, presignExpirySeconds = 5 * 60 } = options
 
   if (file) {
     let userFile: UserFile
@@ -81,7 +87,13 @@ export async function resolveFileInputToUrl(
 
     // Handle internal URLs
     if (fileUrl && isInternalFileUrl(fileUrl)) {
-      const resolution = await resolveInternalFileUrl(fileUrl, userId, requestId, logger)
+      const resolution = await resolveInternalFileUrl(
+        fileUrl,
+        userId,
+        requestId,
+        logger,
+        presignExpirySeconds
+      )
       if (resolution.error) {
         return { error: resolution.error }
       }
@@ -102,7 +114,11 @@ export async function resolveFileInputToUrl(
         return { error: { status: 404, message: 'File not found' } }
       }
 
-      fileUrl = await StorageService.generatePresignedDownloadUrl(userFile.key, context, 5 * 60)
+      fileUrl = await StorageService.generatePresignedDownloadUrl(
+        userFile.key,
+        context,
+        presignExpirySeconds
+      )
     }
 
     return { fileUrl }
@@ -112,7 +128,13 @@ export async function resolveFileInputToUrl(
     let fileUrl = filePath
 
     if (isInternalFileUrl(filePath)) {
-      const resolution = await resolveInternalFileUrl(filePath, userId, requestId, logger)
+      const resolution = await resolveInternalFileUrl(
+        filePath,
+        userId,
+        requestId,
+        logger,
+        presignExpirySeconds
+      )
       if (resolution.error) {
         return { error: resolution.error }
       }
@@ -227,7 +249,8 @@ export async function resolveInternalFileUrl(
   filePath: string,
   userId: string,
   requestId: string,
-  logger: Logger
+  logger: Logger,
+  presignExpirySeconds = 5 * 60
 ): Promise<{ fileUrl?: string; error?: { status: number; message: string } }> {
   if (!isInternalFileUrl(filePath)) {
     return { fileUrl: filePath }
@@ -247,7 +270,11 @@ export async function resolveInternalFileUrl(
       return { error: { status: 404, message: 'File not found' } }
     }
 
-    const fileUrl = await StorageService.generatePresignedDownloadUrl(storageKey, context, 5 * 60)
+    const fileUrl = await StorageService.generatePresignedDownloadUrl(
+      storageKey,
+      context,
+      presignExpirySeconds
+    )
     logger.info(`[${requestId}] Generated presigned URL for ${context} file`)
     return { fileUrl }
   } catch (error) {

apps/sim/tools/buffer/create_post.ts

@@ -62,7 +62,7 @@ export const bufferCreatePostTool: ToolConfig<BufferCreatePostParams, BufferPost
       required: false,
       visibility: 'user-or-llm',
       description:
-        'Image or video to attach — an uploaded file, a file reference from a previous block, or a publicly accessible URL',
+        'Image or video to attach — an uploaded file, a file reference from a previous block, or a publicly accessible URL. Buffer downloads the media at publish time; uploaded files are shared via a link valid for 7 days, so use a public URL for posts scheduled further out',
     },
     mediaType: {
       type: 'string',

apps/sim/tools/buffer/edit_post.ts

@@ -62,7 +62,7 @@ export const bufferEditPostTool: ToolConfig<BufferEditPostParams, BufferPostResp
       required: false,
       visibility: 'user-or-llm',
       description:
-        'Image or video to attach — an uploaded file, a file reference from a previous block, or a publicly accessible URL. Replaces existing attachments',
+        'Image or video to attach — an uploaded file, a file reference from a previous block, or a publicly accessible URL. Buffer downloads the media at publish time; uploaded files are shared via a link valid for 7 days, so use a public URL for posts scheduled further out. Replaces existing attachments',
     },
     mediaType: {
       type: 'string',