1 files changed, 113 insertions, 0 deletions
diff --git a/Sources/SwiftGopherClient/gopherRequestResponseHandler.swift b/Sources/SwiftGopherClient/gopherRequestResponseHandler.swift
new file mode 100644
index 0000000..10da67e
--- /dev/null
+++ b/Sources/SwiftGopherClient/gopherRequestResponseHandler.swift
@@ -0,0 +1,113 @@
+//
+//  gopherRequestResponseHandler.swift
+//
+//
+//  Created by Navan Chauhan on 12/12/23.
+//
+
+import Foundation
+import GopherHelpers
+import NIO
+
+final class GopherRequestResponseHandler: ChannelInboundHandler {
+    typealias InboundIn = ByteBuffer
+    typealias OutboundOut = ByteBuffer
+
+    private var accumulatedData: ByteBuffer
+    private let message: String
+    private let completion: (Result<[gopherItem], Error>) -> Void
+
+    init(message: String, completion: @escaping (Result<[gopherItem], Error>) -> Void) {
+        self.message = message
+        self.completion = completion
+        self.accumulatedData = ByteBuffer()
+    }
+
+    func channelActive(context: ChannelHandlerContext) {
+        var buffer = context.channel.allocator.buffer(capacity: message.utf8.count)
+        buffer.writeString(message)
+        context.writeAndFlush(self.wrapOutboundOut(buffer), promise: nil)
+    }
+
+    func channelRead(context: ChannelHandlerContext, data: NIOAny) {
+        var buffer = unwrapInboundIn(data)
+        accumulatedData.writeBuffer(&buffer)
+    }
+
+    func channelInactive(context: ChannelHandlerContext) {
+        if let dataCopy = accumulatedData.getSlice(at: 0, length: accumulatedData.readableBytes) {
+            parseGopherServerResponse(
+                response: accumulatedData.readString(length: accumulatedData.readableBytes) ?? "",
+                originalBytes: dataCopy)
+        }
+    }
+
+    func errorCaught(context: ChannelHandlerContext, error: Error) {
+        print("Error: ", error)
+        context.close(promise: nil)
+    }
+
+    func createGopherItem(rawLine: String, itemType: gopherItemType = .info, rawData: ByteBuffer)
+        -> gopherItem
+    {
+        var item = gopherItem(rawLine: rawLine)
+        item.parsedItemType = itemType
+        item.rawData = rawData
+
+        if rawLine.isEmpty {
+            item.valid = false
+        } else {
+            let components = rawLine.components(separatedBy: "\t")
+
+            // Handle cases where rawLine does not have any itemType in the first character
+            item.message = String(components[0].dropFirst())
+
+            if components.indices.contains(1) {
+                item.selector = String(components[1])
+            }
+
+            if components.indices.contains(2) {
+                item.host = String(components[2])
+            }
+
+            if components.indices.contains(3) {
+                item.port = Int(String(components[3])) ?? 70
+            }
+        }
+
+        return item
+    }
+
+    func parseGopherServerResponse(response: String, originalBytes: ByteBuffer) {
+        var gopherServerResponse: [gopherItem] = []
+
+        print("parsing")
+        let carriageReturnCount = response.filter({ $0 == "\r" }).count
+        let newlineCarriageReturnCount = response.filter({ $0 == "\r\n" }).count
+        print(
+            "Carriage Returns: \(carriageReturnCount), Newline + Carriage Returns: \(newlineCarriageReturnCount)"
+        )
+
+        if newlineCarriageReturnCount == 0 {
+            for line in response.split(separator: "\n") {
+                let lineItemType = getGopherFileType(item: "\(line.first ?? " ")")
+                let item = createGopherItem(
+                    rawLine: String(line), itemType: lineItemType, rawData: originalBytes)
+                gopherServerResponse.append(item)
+
+            }
+        } else {
+            for line in response.split(separator: "\r\n") {
+                let lineItemType = getGopherFileType(item: "\(line.first ?? " ")")
+                let item = createGopherItem(
+                    rawLine: String(line), itemType: lineItemType, rawData: originalBytes)
+                gopherServerResponse.append(item)
+
+            }
+        }
+
+        print("done parsing")
+
+        completion(.success(gopherServerResponse))
+    }
+}