BREAKING: postgres + saas

app/(app)/files/preview/[fileId]/route.ts

@@ -0,0 +1,56 @@
+import { getCurrentUser } from "@/lib/auth"
+import { fileExists, fullPathForFile } from "@/lib/files"
+import { generateFilePreviews } from "@/lib/previews/generate"
+import { getFileById } from "@/models/files"
+import fs from "fs/promises"
+import { NextResponse } from "next/server"
+import path from "path"
+
+export async function GET(request: Request, { params }: { params: Promise<{ fileId: string }> }) {
+  const { fileId } = await params
+  const user = await getCurrentUser()
+
+  if (!fileId) {
+    return new NextResponse("No fileId provided", { status: 400 })
+  }
+
+  const url = new URL(request.url)
+  const page = parseInt(url.searchParams.get("page") || "1", 10)
+
+  try {
+    // Find file in database
+    const file = await getFileById(fileId, user.id)
+
+    if (!file || file.userId !== user.id) {
+      return new NextResponse("File not found or does not belong to the user", { status: 404 })
+    }
+
+    // Check if file exists on disk
+    const fullFilePath = await fullPathForFile(user, file)
+    const isFileExists = await fileExists(fullFilePath)
+    if (!isFileExists) {
+      return new NextResponse(`File not found on disk: ${file.path}`, { status: 404 })
+    }
+
+    // Generate previews
+    const { contentType, previews } = await generateFilePreviews(user, fullFilePath, file.mimetype)
+    if (page > previews.length) {
+      return new NextResponse("Page not found", { status: 404 })
+    }
+    const previewPath = previews[page - 1] || fullFilePath
+
+    // Read file
+    const fileBuffer = await fs.readFile(previewPath)
+
+    // Return file with proper content type
+    return new NextResponse(fileBuffer, {
+      headers: {
+        "Content-Type": contentType,
+        "Content-Disposition": `inline; filename="${path.basename(previewPath)}"`,
+      },
+    })
+  } catch (error) {
+    console.error("Error serving file:", error)
+    return new NextResponse("Internal Server Error", { status: 500 })
+  }
+}