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fix(services): added plain-text MIME type fallback for consistent file detection #9102

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fix(services): added plain-text MIME type fallback for consistent file detection #9102

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fix(services): added plain-text MIME type fallback for consistent fil…
Rupak182 May 18, 2026
caf6903
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Rupak182 May 18, 2026
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22 changes: 20 additions & 2 deletions packages/services/src/file/helper.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -81,6 +81,18 @@ const detectMimeTypeFromSignature = async (file: File): Promise<string> => {
}
};

const PLAIN_TEXT_MIME_MAP: Record<string, string> = {
md: "text/markdown",
markdown: "text/markdown",
txt: "text/plain",
csv: "text/csv",
json: "application/json",
css: "text/css",
js: "text/javascript",
sql: "application/x-sql",
xml: "text/xml",
};

/**
* @description Validate and detect the MIME type of a file using signature detection
* Also performs basic security checks on filename
Expand All @@ -103,8 +115,14 @@ const validateAndDetectFileType = async (file: File): Promise<string> => {
console.warn("Error detecting file type from signature:", _error);
}

// fallback for unknown files
return "";
// Fallback 1: Static extension lookup for whitelisted plain-text files
const extension = file.name.split(".").pop()?.toLowerCase() || "";
if (Object.hasOwn(PLAIN_TEXT_MIME_MAP, extension)) {
return PLAIN_TEXT_MIME_MAP[extension];
}

// Fallback 2: Generic browser/OS fallback
return file.type || "";
};

/**
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