#include "hf-cache.h"
#include "build-info.h"
#include "common.h"
#include "log.h"
#include "http.h"
#include "json.h"
#include <filesystem>
#include <fstream>
#include <atomic>
#include <string>
#include <string_view>
#include <stdexcept>
#if defined(_WIN32)
#define WIN32_LEAN_AND_MEAN
#ifndef NOMINMAX
#define NOMINMAX
#endif
#define HOME_DIR "USERPROFILE"
#include <windows.h>
#else
#define HOME_DIR "HOME"
#include <unistd.h>
#include <pwd.h>
#endif
namespace hf_cache {
namespace fs = std::filesystem;
static fs::path get_cache_directory() {
static const fs::path cache = []() {
struct {
const char * var;
fs::path path;
} entries[] = {
{"LLAMA_CACHE", fs::path()},
{"HF_HUB_CACHE", fs::path()},
{"HUGGINGFACE_HUB_CACHE", fs::path()},
{"HF_HOME", fs::path("hub")},
{"XDG_CACHE_HOME", fs::path("huggingface") / "hub"},
{HOME_DIR, fs::path(".cache") / "huggingface" / "hub"}
};
for (const auto & entry : entries) {
if (auto * p = std::getenv(entry.var); p && *p) {
fs::path base(p);
return entry.path.empty() ? base : base / entry.path;
}
}
#ifndef _WIN32
const struct passwd * pw = getpwuid(getuid());
if (pw && pw->pw_dir && *pw->pw_dir) {
return fs::path(pw->pw_dir) / ".cache" / "huggingface" / "hub";
}
#endif
throw std::runtime_error("Failed to determine HF cache directory");
}();
return cache;
}
static std::string folder_name_to_repo(const std::string & folder) {
constexpr std::string_view prefix = "models--";
if (folder.rfind(prefix, 0)) {
return {};
}
std::string result = folder.substr(prefix.length());
string_replace_all(result, "--", "/");
return result;
}
static std::string repo_to_folder_name(const std::string & repo_id) {
constexpr std::string_view prefix = "models--";
std::string result = std::string(prefix) + repo_id;
string_replace_all(result, "/", "--");
return result;
}
static fs::path get_repo_path(const std::string & repo_id) {
return get_cache_directory() / repo_to_folder_name(repo_id);
}
static bool is_hex_char(const char c) {
return (c >= 'A' && c <= 'F') ||
(c >= 'a' && c <= 'f') ||
(c >= '0' && c <= '9');
}
static bool is_hex_string(const std::string & s, size_t expected_len) {
if (s.length() != expected_len) {
return false;
}
for (const char c : s) {
if (!is_hex_char(c)) {
return false;
}
}
return true;
}
static bool is_alphanum(const char c) {
return (c >= 'A' && c <= 'Z') ||
(c >= 'a' && c <= 'z') ||
(c >= '0' && c <= '9');
}
static bool is_special_char(char c) {
return c == '/' || c == '.' || c == '-';
}
// base chars [A-Za-z0-9_] are always valid
// special chars [/.-] must be surrounded by base chars
// exactly one '/' required
static bool is_valid_repo_id(const std::string & repo_id) {
if (repo_id.empty() || repo_id.length() > 256) {
return false;
}
int slash = 0;
bool special = true;
for (const char c : repo_id) {
if (is_alphanum(c) || c == '_') {
special = false;
} else if (is_special_char(c)) {
if (special) {
return false;
}
slash += (c == '/');
special = true;
} else {
return false;
}
}
return !special && slash == 1;
}
static bool is_valid_hf_token(const std::string & token) {
if (token.length() < 37 || token.length() > 256 ||
!string_starts_with(token, "hf_")) {
return false;
}
for (size_t i = 3; i < token.length(); ++i) {
if (!is_alphanum(token[i])) {
return false;
}
}
return true;
}
static bool is_valid_commit(const std::string & hash) {
return is_hex_string(hash, 40);
}
static bool is_valid_oid(const std::string & oid) {
return is_hex_string(oid, 40) || is_hex_string(oid, 64);
}
static bool is_valid_subpath(const fs::path & path, const fs::path & subpath) {
if (subpath.is_absolute()) {
return false; // never do a / b with b absolute
}
auto b = fs::absolute(path).lexically_normal();
auto t = (b / subpath).lexically_normal();
auto [b_end, _] = std::mismatch(b.begin(), b.end(), t.begin(), t.end());
return b_end == b.end();
}
static void safe_write_file(const fs::path & path, const std::string & data) {
fs::path path_tmp = path.string() + ".tmp";
if (path.has_parent_path()) {
fs::create_directories(path.parent_path());
}
std::ofstream file(path_tmp);
file << data;
file.close();
std::error_code ec;
if (!file.fail()) {
fs::rename(path_tmp, path, ec);
}
if (file.fail() || ec) {
fs::remove(path_tmp, ec);
throw std::runtime_error("failed to write file: " + path.string());
}
}
static common_json api_get(const std::string & url,
const std::string & token) {
auto [cli, parts] = common_http_client(url);
httplib::Headers headers = {
{"User-Agent", "llama-cpp/" + std::string(llama_build_info())},
{"Accept", "application/json"}
};
if (is_valid_hf_token(token)) {
headers.emplace("Authorization", "Bearer " + token);
} else if (!token.empty()) {
LOG_WRN("%s: invalid token, authentication disabled\n", __func__);
}
if (auto res = cli.Get(parts.path, headers)) {
auto body = res->body;
if (res->status == 200) {
return common_json::parse(res->body);
}
try {
body = common_json::parse(res->body)["error"].get<std::string>();
} catch (...) { }
throw std::runtime_error("GET failed (" + std::to_string(res->status) + "): " + body);
} else {
throw std::runtime_error("HTTPLIB failed: " + httplib::to_string(res.error()));
}
}
static std::string get_repo_commit(const std::string & repo_id,
const std::string & token) {
try {
auto endpoint = common_get_model_endpoint();
auto json = api_get(endpoint + "api/models/" + repo_id + "/refs", token);
if (!json.is_object() ||
!json.contains("branches") || !json["branches"].is_array()) {
LOG_WRN("%s: missing 'branches' for '%s'\n", __func__, repo_id.c_str());
return {};
}
fs::path refs_path = get_repo_path(repo_id) / "refs";
std::string name;
std::string commit;
for (const auto & branch : json["branches"]) {
if (!branch.is_object() ||
!branch.contains("name") || !branch["name"].is_string() ||
!branch.contains("targetCommit") || !branch["targetCommit"].is_string()) {
continue;
}
std::string _name = branch["name"].get<std::string>();
std::string _commit = branch["targetCommit"].get<std::string>();
if (!is_valid_subpath(refs_path, _name)) {
LOG_WRN("%s: skip invalid branch: %s\n", __func__, _name.c_str());
continue;
}
if (!is_valid_commit(_commit)) {
LOG_WRN("%s: skip invalid commit: %s\n", __func__, _commit.c_str());
continue;
}
if (_name == "main") {
name = _name;
commit = _commit;
break;
}
if (name.empty() || commit.empty()) {
name = _name;
commit = _commit;
}
}
if (name.empty() || commit.empty()) {
LOG_WRN("%s: no valid branch for '%s'\n", __func__, repo_id.c_str());
return {};
}
safe_write_file(refs_path / name, commit);
return commit;
} catch (const common_json_error & e) {
LOG_ERR("%s: JSON error: %s\n", __func__, e.what());
} catch (const std::exception & e) {
LOG_ERR("%s: error: %s\n", __func__, e.what());
}
return {};
}
hf_files get_repo_files(const std::string & repo_id,
const std::string & token) {
if (!is_valid_repo_id(repo_id)) {
LOG_WRN("%s: invalid repository: %s\n", __func__, repo_id.c_str());
return {};
}
std::string commit = get_repo_commit(repo_id, token);
if (commit.empty()) {
LOG_WRN("%s: failed to resolve commit for %s\n", __func__, repo_id.c_str());
return {};
}
fs::path blobs_path = get_repo_path(repo_id) / "blobs";
fs::path commit_path = get_repo_path(repo_id) / "snapshots" / commit;
hf_files files;
try {
auto endpoint = common_get_model_endpoint();
auto json = api_get(endpoint + "api/models/" + repo_id + "/tree/" + commit + "?recursive=true", token);
if (!json.is_array()) {
LOG_WRN("%s: response is not an array for '%s'\n", __func__, repo_id.c_str());
return {};
}
for (const auto & item : json) {
if (!item.is_object() ||
!item.contains("type") || !item["type"].is_string() || item["type"] != "file" ||
!item.contains("path") || !item["path"].is_string()) {
continue;
}
hf_file file;
file.repo_id = repo_id;
file.path = item["path"].get<std::string>();
if (!is_valid_subpath(commit_path, file.path)) {
LOG_WRN("%s: skip invalid path: %s\n", __func__, file.path.c_str());
continue;
}
if (item.contains("lfs") && item["lfs"].is_object()) {
if (item["lfs"].contains("oid") && item["lfs"]["oid"].is_string()) {
file.oid = item["lfs"]["oid"].get<std::string>();
}
} else if (item.contains("oid") && item["oid"].is_string()) {
file.oid = item["oid"].get<std::string>();
}
if (!file.oid.empty() && !is_valid_oid(file.oid)) {
LOG_WRN("%s: skip invalid oid: %s\n", __func__, file.oid.c_str());
continue;
}
file.url = endpoint + repo_id + "/resolve/" + commit + "/" + file.path;
fs::path final_path = commit_path / file.path;
file.final_path = final_path.string();
if (!file.oid.empty() && !fs::exists(final_path)) {
fs::path local_path = blobs_path / file.oid;
file.local_path = local_path.string();
} else {
file.local_path = file.final_path;
}
files.push_back(file);
}
} catch (const common_json_error & e) {
LOG_ERR("%s: JSON error: %s\n", __func__, e.what());
} catch (const std::exception & e) {
LOG_ERR("%s: error: %s\n", __func__, e.what());
}
return files;
}
static std::string get_cached_ref(const fs::path & repo_path) {
fs::path refs_path = repo_path / "refs";
if (!fs::is_directory(refs_path)) {
return {};
}
std::string fallback;
for (const auto & entry : fs::directory_iterator(refs_path)) {
if (!entry.is_regular_file()) {
continue;
}
std::ifstream f(entry.path());
std::string commit;
if (!f || !std::getline(f, commit) || commit.empty()) {
continue;
}
if (!is_valid_commit(commit)) {
LOG_WRN("%s: skip invalid commit: %s\n", __func__, commit.c_str());
continue;
}
if (entry.path().filename() == "main") {
return commit;
}
if (fallback.empty()) {
fallback = commit;
}
}
return fallback;
}
hf_files get_cached_files(const std::string & repo_id) {
fs::path cache_dir = get_cache_directory();
if (!fs::exists(cache_dir)) {
return {};
}
if (!repo_id.empty() && !is_valid_repo_id(repo_id)) {
LOG_WRN("%s: invalid repository: %s\n", __func__, repo_id.c_str());
return {};
}
hf_files files;
for (const auto & repo : fs::directory_iterator(cache_dir)) {
if (!repo.is_directory()) {
continue;
}
fs::path snapshots_path = repo.path() / "snapshots";
if (!fs::exists(snapshots_path)) {
continue;
}
std::string _repo_id = folder_name_to_repo(repo.path().filename().string());
if (!is_valid_repo_id(_repo_id)) {
continue;
}
if (!repo_id.empty() && _repo_id != repo_id) {
continue;
}
std::string commit = get_cached_ref(repo.path());
fs::path commit_path = snapshots_path / commit;
if (commit.empty() || !fs::is_directory(commit_path)) {
continue;
}
for (const auto & entry : fs::recursive_directory_iterator(commit_path)) {
if (!entry.is_regular_file() && !entry.is_symlink()) {
continue;
}
fs::path path = entry.path().lexically_relative(commit_path);
if (!path.empty()) {
hf_file file;
file.repo_id = _repo_id;
file.path = path.generic_string();
file.local_path = entry.path().string();
file.final_path = file.local_path;
files.push_back(std::move(file));
}
}
}
return files;
}
std::string finalize_file(const hf_file & file) {
static std::atomic<bool> symlinks_disabled{false};
std::error_code ec;
fs::path local_path(file.local_path);
fs::path final_path(file.final_path);
if (local_path == final_path || fs::exists(final_path, ec)) {
return file.final_path;
}
if (!fs::exists(local_path, ec)) {
return file.final_path;
}
fs::create_directories(final_path.parent_path(), ec);
if (!symlinks_disabled) {
fs::path target = fs::relative(local_path, final_path.parent_path(), ec);
if (!ec) {
fs::create_symlink(target, final_path, ec);
}
if (!ec) {
return file.final_path;
}
}
if (!symlinks_disabled.exchange(true)) {
LOG_WRN("%s: failed to create symlink: %s\n", __func__, ec.message().c_str());
LOG_WRN("%s: switching to degraded mode\n", __func__);
}
fs::rename(local_path, final_path, ec);
if (ec) {
LOG_WRN("%s: failed to move file to snapshots: %s\n", __func__, ec.message().c_str());
fs::copy(local_path, final_path, ec);
if (ec) {
LOG_ERR("%s: failed to copy file to snapshots: %s\n", __func__, ec.message().c_str());
}
}
return file.final_path;
}
bool remove_cached_repo(const std::string & repo_id) {
if (!is_valid_repo_id(repo_id)) {
LOG_WRN("%s: invalid repository: %s\n", __func__, repo_id.c_str());
return false;
}
fs::path repo_path = get_repo_path(repo_id);
std::error_code ec;
auto removed = fs::remove_all(repo_path, ec);
if (ec) {
LOG_ERR("%s: failed to remove repo cache %s: %s\n", __func__, repo_path.string().c_str(), ec.message().c_str());
return false;
}
return removed > 0;
}
} // namespace hf_cache