feat: frontend file upload support

src/lib/utils/index.ts

@@ -127,3 +127,38 @@ export const findWordIndices = (text) => {
 
 	return matches;
 };
+
+export const calculateSHA256 = async (file) => {
+	console.log(file);
+	// Create a FileReader to read the file asynchronously
+	const reader = new FileReader();
+
+	// Define a promise to handle the file reading
+	const readFile = new Promise((resolve, reject) => {
+		reader.onload = () => resolve(reader.result);
+		reader.onerror = reject;
+	});
+
+	// Read the file as an ArrayBuffer
+	reader.readAsArrayBuffer(file);
+
+	try {
+		// Wait for the FileReader to finish reading the file
+		const buffer = await readFile;
+
+		// Convert the ArrayBuffer to a Uint8Array
+		const uint8Array = new Uint8Array(buffer);
+
+		// Calculate the SHA-256 hash using Web Crypto API
+		const hashBuffer = await crypto.subtle.digest('SHA-256', uint8Array);
+
+		// Convert the hash to a hexadecimal string
+		const hashArray = Array.from(new Uint8Array(hashBuffer));
+		const hashHex = hashArray.map((byte) => byte.toString(16).padStart(2, '0')).join('');
+
+		return `sha256:${hashHex}`;
+	} catch (error) {
+		console.error('Error calculating SHA-256 hash:', error);
+		throw error;
+	}
+};

src/lib/utils/rag/index.ts

@@ -0,0 +1,20 @@
+export const RAGTemplate = (context: string, query: string) => {
+	let template = `Use the following context as your learned knowledge, inside <context></context> XML tags.
+	<context>
+	  [context]
+	</context>
+	
+	When answer to user:
+	- If you don't know, just say that you don't know.
+	- If you don't know when you are not sure, ask for clarification.
+	Avoid mentioning that you obtained the information from the context.
+	And answer according to the language of the user's question.
+			
+	Given the context information, answer the query.
+	Query: [query]`;
+
+	template = template.replace(/\[context\]/g, context);
+	template = template.replace(/\[query\]/g, query);
+
+	return template;
+};