Message Attachment Image Recognition (#118)

* Add: Image recognition

* Fix: Non-Attachment Query

* Update: version increment

* Remove: Debugging logs from buffer file

* Add: comments for bufferHandler

src/utils/handlers/bufferHandler.ts

@@ -0,0 +1,57 @@
+import { Attachment } from "discord.js"
+
+/**
+ * Method to convert a Discord attachment url to an array buffer
+ * 
+ * @param url Discord Attachment Url
+ * @returns array buffer from Attachment Url
+ */
+async function getAttachmentBuffer(url: string): Promise<ArrayBuffer> {
+    // Get the data from the image
+    const response = await fetch(url)
+
+    // Validate the image came in fine
+    if (!response.ok)
+        throw new Error('Failed to fetch the attachment.')
+
+    // Return image as Buffer
+    return await response.arrayBuffer()
+}
+
+/**
+ * Method to convert an array buffer to a Base64 String
+ * 
+ * @param buffer Array Buffer from attachment
+ * @returns converted Base64 string
+ */
+function arrayBufferToBase64(buffer: ArrayBuffer): string {
+    // Converting to Uint8Array
+    const uint8Array = new Uint8Array(buffer)
+    let binary = ''
+    const len = uint8Array.byteLength;
+    for (let i = 0; i < len; i++) {
+        binary += String.fromCharCode(uint8Array[i])
+    }
+
+    // Return as Base64
+    return Buffer.from(binary, 'binary').toString('base64')
+}
+
+/**
+ * Method to retrieve the Base64 Array of provided Message Attachment
+ * 
+ * @param attachment Message Attachment from Discord
+ * @returns Base64 string array
+ */
+export async function getAttachmentData(attachment: Attachment | undefined): Promise<string[]> {
+    const url: string = attachment !== undefined ? attachment.url : "Missing Url"
+
+    // case of no attachment
+    if (url === "Missing Url")
+        return []
+
+    // Convert data to base64
+    const buffer = await getAttachmentBuffer(url)
+    const base64String = arrayBufferToBase64(buffer)
+    return [base64String]
+}