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OPEN_CLOUD_API_KEY =\n 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new Set([\n 73, // FontFamily\n 74, // FontFace\n]);\n\nfunction cleanFileName(name: string): string {\n let s = (name || \"\").replace(/[\\x00-\\x1f<>:\"/\\\\|?*]+/g, \" \");\n s = s.replace(/\\s+/g, \" \").trim();\n if (!s) s = \"asset\";\n if (s.length > 128) s = s.slice(0, 128);\n return s;\n}\n\nfunction bytesToAsciiPrefix(bytes: Uint8Array, max = 16): string {\n const len = Math.min(bytes.length, max);\n let out = \"\";\n for (let i = 0; i < len; i++) {\n const c = bytes[i];\n if (c < 0x20 && c !== 0x09 && c !== 0x0a && c !== 0x0d) {\n out += \" \";\n } else if (c > 0x7e) {\n out += \" \";\n } else {\n out += String.fromCharCode(c);\n }\n }\n return out;\n}\n\n/**\n * Detect whether the file is Roblox XML (.rbxlx/.rbxmx) or Roblox binary (.rbxl/.rbxm),\n * using the = 8 && sig[7] === \"!\") return \"binary\";\n return \"xml\";\n}\n\nfunction extensionFromContentType(ctRaw: string | null): string | null {\n if (!ctRaw) return null;\n const ct = ctRaw.split(\";\")[0].trim().toLowerCase();\n if (!ct) return null;\n\n const slash = ct.indexOf(\"/\");\n if (slash === -1) return null;\n\n const type = ct.slice(0, slash);\n let sub = ct.slice(slash + 1);\n\n const plus = sub.indexOf(\"+\");\n if (plus !== -1) sub = sub.slice(0, plus);\n\n switch (type) {\n case \"image\": {\n if (sub === \"jpeg\" || sub === \"pjpeg\") return \"jpg\";\n if (sub === \"svg\") return \"svg\";\n if (sub === \"tiff\") return \"tif\";\n if (sub === \"x-icon\" || sub === \"vnd.microsoft.icon\") return \"ico\";\n // png, gif, webp, bmp, tga, etc → same as subtype\n return sub;\n }\n case \"audio\": {\n if (sub === \"mpeg\" || sub === \"mp3\") return \"mp3\";\n if (sub === \"ogg\" || sub === \"vorbis\") return \"ogg\";\n if (sub === \"wav\" || sub === \"x-wav\") return \"wav\";\n return sub;\n }\n case \"video\": {\n if (sub === \"x-msvideo\") return \"avi\";\n if (sub === \"quicktime\") return \"mov\";\n return sub; // mp4, webm, etc\n }\n case \"font\": {\n if (sub === \"ttf\" || sub === \"sfnt\") return \"ttf\";\n if (sub === \"otf\") return \"otf\";\n if (sub === \"woff\" || sub === \"woff2\") return sub;\n return null;\n }\n case \"text\": {\n if (sub === \"plain\") return \"txt\";\n if (sub === \"html\") return \"html\";\n if (sub === \"csv\") return \"csv\";\n if (sub === \"xml\") return \"xml\";\n if (sub === \"javascript\") return \"js\";\n return \"txt\";\n }\n case \"application\": {\n if (sub === \"json\") return \"json\";\n if (sub === \"xml\") return \"xml\";\n if (sub === \"zip\" || sub === \"x-zip-compressed\") return \"zip\";\n if (sub === \"x-gzip\" || sub === \"gzip\") return \"gz\";\n if (sub === \"pdf\") return \"pdf\";\n if (sub === \"octet-stream\" || sub === \"x-msdownload\") return null;\n break;\n }\n }\n return null;\n}\n\nfunction guessExtension(\n assetTypeId: number | undefined,\n contentType: string,\n head: Uint8Array,\n): string {\n const domKind = detectRobloxDomKind(head);\n\n if (domKind) {\n if 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\"webm\";\n }\n\n if (FONT_TYPE_IDS.has(assetTypeId)) {\n // Fonts – will usually have a proper font/* MIME, but fall back\n return \"otf\";\n }\n\n // Localization tables\n if (assetTypeId === 59 || assetTypeId === 60) {\n return \"csv\";\n }\n\n if (ANIMATION_TYPE_IDS.has(assetTypeId)) {\n return \"rbxanim\";\n }\n\n // Everything else → safest generic binary\n return \"bin\";\n}\n\nexport default async function main(req: Request): Promise {\n if (\n !OPEN_CLOUD_API_KEY ||\n OPEN_CLOUD_API_KEY === \"REPLACE_WITH_YOUR_OPEN_CLOUD_KEY\"\n ) {\n return new Response(\"Server misconfigured: set OPEN_CLOUD_API_KEY.\", {\n status: 500,\n });\n }\n\n const url = new URL(req.url);\n let id = url.searchParams.get(\"id\") || url.pathname.replace(/^\\/+/, \"\");\n id = (id || \"\").trim();\n\n if (!id || !/^\\d+$/.test(id)) {\n return new Response(\"Missing or invalid ?id=\", { status: 400 });\n }\n\n const authHeaders = { \"x-api-key\": OPEN_CLOUD_API_KEY };\n\n const [deliveryRes, metaRes] = await Promise.all([\n fetch(DELIVERY_URL + id, { headers: authHeaders }),\n fetch(ASSETS_URL + id, { headers: authHeaders }),\n ]);\n\n if (!deliveryRes.ok) {\n const body = await deliveryRes.text().catch(() => \"\");\n return new Response(body || \"asset-delivery failed\", {\n status: deliveryRes.status || 502,\n });\n }\n\n let displayName = id;\n try {\n if (metaRes.ok) {\n const meta = (await metaRes.json()) as { displayName?: string };\n if (meta.displayName && meta.displayName.trim()) {\n displayName = cleanFileName(meta.displayName);\n }\n }\n } catch {\n // ignore and fall back to id\n }\n\n const delivery = (await deliveryRes.json()) as {\n location?: string;\n assetTypeId?: number;\n };\n\n if (!delivery.location) {\n return new Response(\"No CDN location from asset-delivery\", { status: 502 });\n }\n\n const assetRes = await fetch(delivery.location);\n if (!assetRes.ok) {\n const body = await assetRes.text().catch(() => \"\");\n return new Response(body || \"CDN fetch 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