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Pascal Engélibert 2026-01-25 18:27:23 +01:00
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[package]
name = "blindforge"
version = "0.1.0"
edition = "2024"
[dependencies]
base64-turbo = "0.1.3"
#flate2 = "1.1.8"
rand = "0.9.2"
reqwest = { version = "0.13.1", default-features = false, features = ["json"] }
serde = { version = "1.0.228", features = ["derive"] }
sha2 = "0.10.9"
#tar = "0.4.44"
trillium = "0.2.20"

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GNU AFFERO GENERAL PUBLIC LICENSE
Version 3, 19 November 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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How to Apply These Terms to Your New Programs
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Also add information on how to contact you by electronic and paper mail.
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You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
<https://www.gnu.org/licenses/>.

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## TODO
* [ ] Fetch repo from API
* [ ] Repo caching
* [ ] Submission form
* [ ] Repo serving
* [ ] Replace words
* [ ] Abuse report
* [ ] Admin tools
* [ ] Captcha
* [ ] Rate-limiting and space quota
* [ ] Expiration
* [ ] Manual removal
* [ ] Security tests (zip bomb)
* [ ] Allow download
* [ ] Config

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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<title>Blindforge</title>
</head>
<body>
<form action="fetch" method="post">
<label for="f-repo-url">Repo URL:</label>
<input type="text" id="f-repo-url" name="repo-url"/><br/>
<input type="submit" value="Fetch"/>
</form>
</body>
</html>

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hard_tabs = true
imports_granularity = "Crate"
unstable_features = true
format_code_in_doc_comments = true
format_macro_bodies = true
format_macro_matchers = true
format_strings = true

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use std::{collections::HashSet, io::Write, path::PathBuf};
use crate::config::Config;
use rand::Rng;
use reqwest::Client;
use serde::Deserialize;
use sha2::Digest;
pub const USER_AGENT: &str = "Blindforge";
pub const MAX_PAGE: u32 = 256;
pub const MAX_ENTRIES: u32 = 256;
pub const MAX_FILE_SIZE: u64 = 8 * 1024 * 1024;
pub const MAX_PATH_SIZE: usize = 1024;
pub const MAX_URL_SIZE: usize = 256;
#[derive(Deserialize)]
struct RepoGetTagResponse {
tarball_url: String,
}
pub fn make_client() -> Result<Client, reqwest::Error> {
reqwest::ClientBuilder::new().user_agent(USER_AGENT).build()
}
pub async fn fetch_repo_archive_url(
client: &mut Client,
url: &str,
owner: &str,
repo: &str,
tag: &str,
token: Option<&str>,
) -> Result<String, reqwest::Error> {
let mut req = client.get(&format!("{url}/api/v1/repos/{owner}/{repo}/tags/{tag}"));
if let Some(token) = token {
req = req.header("Authorization", format!("token {token}"));
}
let res: RepoGetTagResponse = req.send().await?.error_for_status()?.json().await?;
Ok(res.tarball_url)
}
#[derive(Deserialize)]
struct GitTreeResponse {
tree: Vec<GitEntry>,
truncated: bool,
total_count: u32,
}
#[derive(Deserialize)]
struct GitEntry {
path: String,
#[serde(rename = "type")]
entry_type: String,
size: u64,
url: String,
}
async fn fetch_repo_tree_at_commit_page(
client: &mut Client,
url: &str,
owner: &str,
repo: &str,
commit_hash: &str,
token: Option<&str>,
page: u32,
) -> Result<GitTreeResponse, reqwest::Error> {
let mut req = client.get(&format!(
"{url}/api/v1/repos/{owner}/{repo}/git/trees/{commit_hash}?recursive=true&page={page}"
));
if let Some(token) = token {
req = req.header("Authorization", format!("token {token}"));
}
// TODO ensure we don't use too much memory
req.send().await?.error_for_status()?.json().await
}
#[derive(Debug)]
pub enum FetchRepoError {
CannotCreateDir(std::io::Error),
TooManyEntries,
Reqwest(reqwest::Error),
}
impl From<reqwest::Error> for FetchRepoError {
fn from(value: reqwest::Error) -> Self {
Self::Reqwest(value)
}
}
#[derive(Default)]
pub struct RepoIndex {
files: Vec<RepoIndexFile>,
}
pub struct RepoIndexFile {
path: String,
url: String,
}
pub async fn fetch_repo_tree_index_at_commit(
client: &mut Client,
url: &str,
owner: &str,
repo: &str,
commit_hash: &str,
token: Option<&str>,
) -> Result<RepoIndex, FetchRepoError> {
let mut repo_index = RepoIndex::default();
let mut count: u32 = 0;
for page in 1..MAX_PAGE {
let res =
fetch_repo_tree_at_commit_page(client, url, owner, repo, commit_hash, token, page)
.await?;
count = count.saturating_add(res.total_count);
if count > MAX_ENTRIES || res.total_count > MAX_ENTRIES {
return Err(FetchRepoError::TooManyEntries);
}
if res.tree.is_empty() {
break;
}
for entry in res.tree {
if entry.entry_type.as_str() == "blob"
&& entry.size <= MAX_FILE_SIZE
&& entry.path.len() <= MAX_PATH_SIZE
&& entry.url.len() <= MAX_URL_SIZE
{
repo_index.files.push(RepoIndexFile {
path: entry.path,
url: entry.url,
});
}
}
if !res.truncated || count >= res.total_count {
break;
}
}
Ok(repo_index)
}
#[derive(Deserialize)]
struct GitBlob {
content: String,
}
pub async fn fetch_repo_files(
config: &Config,
client: &mut Client,
repo_index: &RepoIndex,
token: Option<&str>,
) -> Result<(), FetchRepoError> {
let mut hasher = sha2::Sha256::default();
let repo_key: [u8; 32] = rand::rng().random();
hasher.update(&repo_key);
let repo_id: [u8; 32] = hasher.finalize_reset().into();
let mut repo_id_str = [0; 24];
base64_turbo::URL_SAFE
.encode_into(&repo_id[0..16], &mut repo_id_str)
.expect("unreachable");
let repo_id_str = str::from_utf8(&repo_id_str).expect("unreachable");
let repo_dir = PathBuf::from(&config.data_dir).join(repo_id_str);
std::fs::create_dir(&repo_dir).map_err(FetchRepoError::CannotCreateDir)?;
let mut file_index = HashSet::new();
for file in repo_index.files.iter() {
let mut req = client.get(&file.url);
if let Some(token) = token {
req = req.header("Authorization", format!("token {token}"));
}
// TODO ensure we don't use too much memory
let blob: GitBlob = req.send().await?.error_for_status()?.json().await?;
if base64_turbo::STANDARD.estimate_decoded_len(blob.content.len()) as u64 > MAX_FILE_SIZE {
continue;
}
if let Ok(content) = base64_turbo::STANDARD.decode(&blob.content) {
hasher.update(&content);
let file_name: [u8; 32] = hasher.finalize_reset().into();
if file_index.insert(file_name) {
let mut file_name_str = [0; 44];
base64_turbo::URL_SAFE
.encode_into(&file_name, &mut file_name_str)
.expect("unreachable");
let file_name_str = str::from_utf8(&file_name_str).expect("unreachable");
if let Ok(mut file) = std::fs::OpenOptions::new()
.create_new(true)
.write(true)
.open(repo_dir.join(file_name_str))
{
file.write_all(&content).unwrap();
}
}
}
}
Ok(())
}

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pub struct Config {
/// Path to the directory where repositories will be stored
pub data_dir: String,
/// User-Agent used by the API client
pub api_client_user_agent: String,
/// Maximum number of pages to request
pub api_client_max_page: u32,
/// Maximum number of entries (files and directories) in a Git tree
pub max_entries: u32,
/// Files bigger than this number of bytes will be ignored
pub max_file_size: u64,
/// File paths bigger than this number of bytes will be ignored
pub max_file_path_len: usize,
/// API URL maximum length
pub api_client_max_url_len: usize,
}
impl Default for Config {
fn default() -> Self {
Self {
data_dir: String::from("TODO"),
api_client_user_agent: String::from("Blindforge"),
api_client_max_page: 32,
max_entries: 1024,
max_file_size: 8 * 1024 * 1024,
max_file_path_len: 8192,
api_client_max_url_len: 256,
}
}
}

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mod api_client;
mod config;
mod repo;
fn main() {
println!("Hello, world!");
}

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use crate::{
api_client::{MAX_PATH_SIZE, MAX_URL_SIZE},
config::Config,
};
use std::{
io::{ErrorKind, Read},
path::Path,
};
const REPO_METADATA_FILE_NAME: &str = "meta.bin";
#[derive(Debug)]
pub struct RepoMetadata {
pub date: u64,
pub commit_url: String,
content: Vec<u8>,
}
#[derive(Debug)]
pub enum ReadRepoMetadataError {
CannotOpenFile(std::io::Error),
CannotReadFile(std::io::Error),
InvalidFormat,
UnsupportedVersion,
}
impl From<std::io::Error> for ReadRepoMetadataError {
fn from(value: std::io::Error) -> Self {
match value.kind() {
ErrorKind::UnexpectedEof => Self::InvalidFormat,
_ => Self::CannotReadFile(value),
}
}
}
impl From<std::string::FromUtf8Error> for ReadRepoMetadataError {
fn from(value: std::string::FromUtf8Error) -> Self {
Self::InvalidFormat
}
}
impl RepoMetadata {
pub fn new(config: &Config, repo_dir: &Path) -> Result<Self, ReadRepoMetadataError> {
let mut file = std::fs::OpenOptions::new()
.read(true)
.open(repo_dir.join(""))
.map_err(ReadRepoMetadataError::CannotOpenFile)?;
let mut version = [0u8; 1];
file.read_exact(&mut version)?;
if version != [0] {
return Err(ReadRepoMetadataError::UnsupportedVersion);
}
let mut date = [0u8; 8];
file.read_exact(&mut date)?;
let date = u64::from_be_bytes(date);
let mut commit_url_len = [0u8; 4];
file.read_exact(&mut commit_url_len)?;
let commit_url_len = u32::from_be_bytes(commit_url_len) as usize;
if commit_url_len > MAX_URL_SIZE {
return Err(ReadRepoMetadataError::InvalidFormat);
}
let mut commit_url = vec![0; commit_url_len];
file.read_exact(&mut commit_url)?;
let commit_url = String::from_utf8(commit_url)?;
let mut content = Vec::new();
file.read_to_end(&mut content)?;
Ok(Self {
date,
commit_url,
content,
})
}
pub fn iter_files<'a>(&'a self) -> RepoMetadataIter<'a> {
RepoMetadataIter {
repo_metadata: self,
offset: 0,
}
}
}
pub struct RepoMetadataIter<'a> {
repo_metadata: &'a RepoMetadata,
offset: usize,
}
pub struct RepoMetadataEntry<'a> {
file_path: &'a str,
hash: &'a str,
}
impl<'a> Iterator for RepoMetadataIter<'a> {
type Item = Result<RepoMetadataEntry<'a>, ReadRepoMetadataError>;
fn next(&mut self) -> Option<Self::Item> {
if self.offset == self.repo_metadata.content.len() {
return None;
}
if self.offset + 4 > self.repo_metadata.content.len() {
return Some(Err(ReadRepoMetadataError::InvalidFormat));
}
let file_path_len = u32::from_be_bytes(
self.repo_metadata.content[self.offset..self.offset + 4]
.try_into()
.expect("unreachable"),
) as usize;
if file_path_len > MAX_PATH_SIZE {
return Some(Err(ReadRepoMetadataError::InvalidFormat));
}
if self.offset + file_path_len + 48 > self.repo_metadata.content.len() {
return Some(Err(ReadRepoMetadataError::InvalidFormat));
}
let Ok(file_path) = str::from_utf8(
&self.repo_metadata.content[self.offset + 4..self.offset + 4 + file_path_len],
) else {
return Some(Err(ReadRepoMetadataError::InvalidFormat));
};
let Ok(hash) = str::from_utf8(
&self.repo_metadata.content
[self.offset + 4 + file_path_len..self.offset + 48 + file_path_len],
) else {
return Some(Err(ReadRepoMetadataError::InvalidFormat));
};
Some(Ok(RepoMetadataEntry { file_path, hash }))
}
}