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fix(coding-agent): detect image MIME via file-type (#205)

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Co-authored-by: Mario Zechner <badlogicgames@gmail.com>
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Peter Steinberger 2025-12-17 17:11:56 +01:00 • committed by GitHub
parent 46ba48a35d
commit d70edf571e
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8 changed files with 191 additions and 50 deletions
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packages/coding-agent/src/utils/mime.ts Normal file
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import { open } from "node:fs/promises";
import { fileTypeFromBuffer } from "file-type";
const IMAGE_MIME_TYPES = new Set(["image/jpeg", "image/png", "image/gif", "image/webp"]);
const FILE_TYPE_SNIFF_BYTES = 4100;
export async function detectSupportedImageMimeTypeFromFile(filePath: string): Promise<string | null> {
const fileHandle = await open(filePath, "r");
try {
const buffer = Buffer.alloc(FILE_TYPE_SNIFF_BYTES);
const { bytesRead } = await fileHandle.read(buffer, 0, FILE_TYPE_SNIFF_BYTES, 0);
if (bytesRead === 0) {
return null;
}
const fileType = await fileTypeFromBuffer(buffer.subarray(0, bytesRead));
if (!fileType) {
return null;
}
if (!IMAGE_MIME_TYPES.has(fileType.mime)) {
return null;
}
return fileType.mime;
} finally {
await fileHandle.close();
}
}