init [skip ci]

.gitattributes

@@ -0,0 +1,2 @@
+* text=auto
+*.torrent binary

.gitignore

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+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb

Cargo.toml

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+# 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!
+[package]
+name = "bittorrent-starter-rust"
+version = "0.1.0"
+authors = ["Codecrafters <hello@codecrafters.io>"]
+edition = "2021"
+
+# 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!
+[dependencies]
+anyhow = "1.0.68"                                                  # error handling
+bytes = "1.3.0"                                                    # helps wrap responses from reqwest
+clap = { version = "4.0.32", features = ["derive"]}                # creating a cli
+hex = "0.4.3"
+regex = "1"                                                        # for regular expressions
+reqwest = { version = "0.11.18", features = ["json", "blocking"] } # http requests
+serde = { version = "1.0.136", features = ["derive"] }             # for json mangling
+serde_bencode = "0.2.3"                                            # for bencode encoding/decoding
+serde_bytes = "0.11.12"                                            # for dealing with bytes
+serde_json = "1.0.105"                                             # for json mangling
+serde_urlencoded = "0.7.1"                                         # for url encoding
+sha1 = "0.10.1"                                                    # hashing
+tempfile = "3"                                                     # creating temporary directories
+thiserror = "1.0.38"                                               # error handling
+tokio = { version = "1.23.0", features = ["full"] }                # async http requests

README.md

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+[![progress-banner](https://backend.codecrafters.io/progress/bittorrent/ec9f21f6-198a-4329-8b4c-b7e0dff6c180)](https://app.codecrafters.io/users/codecrafters-bot?r=2qF)
+
+This is a starting point for Rust 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 `src/main.rs`. Study
+and uncomment the relevant code, and push your changes to pass the first stage:
+
+```sh
+git commit -am "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 `cargo (1.70)` installed locally
+1. Run `./your_bittorrent.sh` to run your program, which is implemented in
+   `src/main.rs`. This command compiles your Rust project, so it might be slow
+   the first time you run it. Subsequent runs will be fast.
+1. Commit your changes and run `git push origin master` to submit your solution
+   to CodeCrafters. Test output will be streamed to your terminal.

codecrafters.yml

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+# 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 Rust version used to run your code
+# on Codecrafters.
+#
+# Available versions: rust-1.77
+language_pack: rust-1.77

sample.torrent

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+d8:announce55:http://bittorrent-test-tracker.codecrafters.io/announce10:created by13:mktorrent 1.14:infod6:lengthi92063e4:name10:sample.txt12:piece lengthi32768e6:pieces60:èvöz*ˆ†èókg&â—-n"uæ vfVsn<73>ÿµR­<>5ð
“zß‚¼<E2809A>	r'­ž<C2AD>šÌee

src/main.rs

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+use serde_json;
+use std::env;
+
+// Available if you need it!
+// use serde_bencode
+
+#[allow(dead_code)]
+fn decode_bencoded_value(encoded_value: &str) -> serde_json::Value {
+    // If encoded_value starts with a digit, it's a number
+    if encoded_value.chars().next().unwrap().is_digit(10) {
+        // Example: "5:hello" -> "hello"
+        let colon_index = encoded_value.find(':').unwrap();
+        let number_string = &encoded_value[..colon_index];
+        let number = number_string.parse::<i64>().unwrap();
+        let string = &encoded_value[colon_index + 1..colon_index + 1 + number as usize];
+        return serde_json::Value::String(string.to_string());
+    } else {
+        panic!("Unhandled encoded value: {}", encoded_value)
+    }
+}
+
+// Usage: your_bittorrent.sh decode "<encoded_value>"
+fn main() {
+    let args: Vec<String> = env::args().collect();
+    let command = &args[1];
+
+    if command == "decode" {
+        // You can use print statements as follows for debugging, they'll be visible when running tests.
+        println!("Logs from your program will appear here!");
+
+        // Uncomment this block to pass the first stage
+        // let encoded_value = &args[2];
+        // let decoded_value = decode_bencoded_value(encoded_value);
+        // println!("{}", decoded_value.to_string());
+    } else {
+        println!("unknown command: {}", args[1])
+    }
+}

your_bittorrent.sh

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+#!/bin/sh
+#
+# DON'T EDIT THIS!
+#
+# CodeCrafters uses this file to test your code. Don't make any changes here!
+#
+# DON'T EDIT THIS!
+exec cargo run \
+    --quiet \
+    --release \
+    --target-dir=/tmp/codecrafters-bittorrent-target \
+    --manifest-path $(dirname "$0")/Cargo.toml -- "$@"