init [skip ci]

8 files changed, 143 insertions, 0 deletions

diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..5b0130c
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,2 @@
+* text=auto
+*.torrent binary
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..c625865
--- /dev/null
+++ b/README.md
@@ -0,0 +1,36 @@
+[![progress-banner](https://backend.codecrafters.io/progress/bittorrent/7b843c61-6372-403e-b4b8-36d62665ebac)](https://app.codecrafters.io/users/codecrafters-bot?r=2qF)
+
+This is a starting point for Go solutions to the
+["Build Your Own BitTorrent" Challenge](https://app.codecrafters.io/courses/bittorrent/overview).
+
+In this challenge, you’ll build a BitTorrent client that's capable of parsing a
+.torrent file and downloading a file from a peer. Along the way, we’ll learn
+about how torrent files are structured, HTTP trackers, BitTorrent’s Peer
+Protocol, pipelining and more.
+
+**Note**: If you're viewing this repo on GitHub, head over to
+[codecrafters.io](https://codecrafters.io) to try the challenge.
+
+# Passing the first stage
+
+The entry point for your BitTorrent implementation is in
+`cmd/mybittorrent/main.go`. Study and uncomment the relevant code, and push your
+changes to pass the first stage:
+
+```sh
+git add .
+git commit -m "pass 1st stage" # any msg
+git push origin master
+```
+
+Time to move on to the next stage!
+
+# Stage 2 & beyond
+
+Note: This section is for stages 2 and beyond.
+
+1. Ensure you have `go (1.19)` installed locally
+1. Run `./your_bittorrent.sh` to run your program, which is implemented in
+   `cmd/mybittorrent/main.go`.
+1. Commit your changes and run `git push origin master` to submit your solution
+   to CodeCrafters. Test output will be streamed to your terminal.
diff --git a/cmd/mybittorrent/main.go b/cmd/mybittorrent/main.go
new file mode 100644
index 0000000..ba70193
--- /dev/null
+++ b/cmd/mybittorrent/main.go
@@ -0,0 +1,63 @@
+package main
+
+import (
+	// Uncomment this line to pass the first stage
+	// "encoding/json"
+	"fmt"
+	"os"
+	"strconv"
+	"unicode"
+	// bencode "github.com/jackpal/bencode-go" // Available if you need it!
+)
+
+// Example:
+// - 5:hello -> hello
+// - 10:hello12345 -> hello12345
+func decodeBencode(bencodedString string) (interface{}, error) {
+	if unicode.IsDigit(rune(bencodedString[0])) {
+		var firstColonIndex int
+
+		for i := 0; i < len(bencodedString); i++ {
+			if bencodedString[i] == ':' {
+				firstColonIndex = i
+				break
+			}
+		}
+
+		lengthStr := bencodedString[:firstColonIndex]
+
+		length, err := strconv.Atoi(lengthStr)
+		if err != nil {
+			return "", err
+		}
+
+		return bencodedString[firstColonIndex+1 : firstColonIndex+1+length], nil
+	} else {
+		return "", fmt.Errorf("Only strings are supported at the moment")
+	}
+}
+
+func main() {
+	// You can use print statements as follows for debugging, they'll be visible when running tests.
+	fmt.Println("Logs from your program will appear here!")
+
+	command := os.Args[1]
+
+	if command == "decode" {
+		// Uncomment this block to pass the first stage
+		//
+		// bencodedValue := os.Args[2]
+		//
+		// decoded, err := decodeBencode(bencodedValue)
+		// if err != nil {
+		// 	fmt.Println(err)
+		// 	return
+		// }
+		//
+		// jsonOutput, _ := json.Marshal(decoded)
+		// fmt.Println(string(jsonOutput))
+	} else {
+		fmt.Println("Unknown command: " + command)
+		os.Exit(1)
+	}
+}
diff --git a/codecrafters.yml b/codecrafters.yml
new file mode 100644
index 0000000..77886cf
--- /dev/null
+++ b/codecrafters.yml
@@ -0,0 +1,11 @@
+# Set this to true if you want debug logs.
+#
+# These can be VERY verbose, so we suggest turning them off
+# unless you really need them.
+debug: false
+
+# Use this to change the Go version used to run your code
+# on Codecrafters.
+#
+# Available versions: go-1.22
+language_pack: go-1.22
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..5240950
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,13 @@
+// DON'T EDIT THIS!
+//
+// Codecrafters relies on this file being intact to run tests successfully. Any changes
+// here will not reflect when CodeCrafters tests your code, and might even cause build
+// failures.
+//
+// DON'T EDIT THIS!
+
+module github.com/codecrafters-io/bittorrent-starter-go
+
+go 1.22
+
+require github.com/jackpal/bencode-go v1.0.0 // indirect
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..d589a1c
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+github.com/jackpal/bencode-go v1.0.0 h1:lzbSPPqqSfWQnqVNe/BBY1NXdDpncArxShL10+fmFus=
+github.com/jackpal/bencode-go v1.0.0/go.mod h1:5FSBQ74yhCl5oQ+QxRPYzWMONFnxbL68/23eezsBI5c=
diff --git a/sample.torrent b/sample.torrent
new file mode 100644
index 0000000..44d1411
--- /dev/null
+++ b/sample.torrent
@@ -0,0 +1 @@
+d8:announce55:http://bittorrent-test-tracker.codecrafters.io/announce10:created by13:mktorrent 1.14:infod6:lengthi92063e4:name10:sample.txt12:piece lengthi32768e6:pieces60:�v�z*����kg&���-n"u��vfVsn���R��5�
�z����	r'�����ee
\ No newline at end of file
diff --git a/your_bittorrent.sh b/your_bittorrent.sh
new file mode 100755
index 0000000..60315cc
--- /dev/null
+++ b/your_bittorrent.sh
@@ -0,0 +1,15 @@
+#!/bin/sh
+#
+# DON'T EDIT THIS!
+#
+# CodeCrafters uses this file to test your code. Don't make any changes here!
+#
+# DON'T EDIT THIS!
+set -e
+
+tmpFile=$(mktemp)
+
+( cd $(dirname "$0") &&
+	go build -o "$tmpFile" ./cmd/mybittorrent )
+
+exec "$tmpFile" "$@"