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/* snac - A simple, minimalistic ActivityPub instance */
/* copyright (c) 2022 - 2026 grunfink et al. / MIT license */
#define XS_IMPLEMENTATION
#include "xs.h"
#include "xs_hex.h"
#include "xs_io.h"
#include "xs_unicode_tbl.h"
#include "xs_unicode.h"
#include "xs_json.h"
#include "xs_curl.h"
#include "xs_openssl.h"
#include "xs_socket.h"
#include "xs_unix_socket.h"
#include "xs_url.h"
#include "xs_http.h"
#include "xs_httpd.h"
#include "xs_mime.h"
#include "xs_regex.h"
#include "xs_set.h"
#include "xs_time.h"
#include "xs_glob.h"
#include "xs_random.h"
#include "xs_match.h"
#include "xs_fcgi.h"
#include "xs_html.h"
#include "xs_po.h"
#include "xs_webmention.h"
#include "snac.h"
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/wait.h>
xs_str *srv_basedir = NULL;
xs_dict *srv_config = NULL;
xs_str *srv_baseurl = NULL;
xs_str *srv_proxy_token_seed = NULL;
xs_dict *srv_langs = NULL;
int dbglevel = 0;
int mkdirx(const char *pathname)
/* creates a directory with special permissions */
{
int ret;
if ((ret = mkdir(pathname, DIR_PERM)) != -1) {
/* try to the set the setgid bit, to allow system users
to create files in these directories using the
command-line tool. This may fail in some restricted
environments, but it's of no use there anyway */
chmod(pathname, DIR_PERM_ADD);
}
return ret;
}
xs_str *tid(int offset)
/* returns a time-based Id */
{
struct timeval tv;
gettimeofday(&tv, NULL);
return xs_fmt("%010ld.%06ld", (long)tv.tv_sec + (long)offset, (long)tv.tv_usec);
}
double ftime(void)
/* returns the UNIX time as a float */
{
xs *ntid = tid(0);
return atof(ntid);
}
int validate_uid(const char *uid)
/* returns if uid is a valid identifier */
{
if (!uid || *uid == '\0')
return 0;
while (*uid) {
if (!(isalnum(*uid) || *uid == '_'))
return 0;
uid++;
}
return 1;
}
void srv_log(xs_str *str)
/* logs a debug message */
{
if (xs_str_in(str, srv_basedir) != -1) {
/* replace basedir with ~ */
str = xs_replace_i(str, srv_basedir, "~");
}
xs *tm = xs_str_localtime(0, "%H:%M:%S");
fprintf(stderr, "%s %s\n", tm, str);
/* if the ~/log/ folder exists, also write to a file there */
xs *dt = xs_str_localtime(0, "%Y-%m-%d");
xs *lf = xs_fmt("%s/log/%s.log", srv_basedir, dt);
FILE *f;
if ((f = fopen(lf, "a")) != NULL) {
fprintf(f, "%s %s\n", tm, str);
fclose(f);
}
xs_free(str);
}
void snac_log(snac *snac, xs_str *str)
/* prints a user debugging information */
{
xs *o_str = str;
xs_str *msg = xs_fmt("[%s] %s", snac->uid, o_str);
if (xs_str_in(msg, snac->basedir) != -1) {
/* replace long basedir references with ~ */
msg = xs_replace_i(msg, snac->basedir, "~");
}
srv_log(msg);
}
xs_str *hash_password(const char *uid, const char *passwd, const char *nonce)
/* hashes a password */
{
xs *d_nonce = NULL;
xs *combi;
xs *hash;
if (nonce == NULL) {
unsigned int r;
xs_rnd_buf(&r, sizeof(r));
d_nonce = xs_fmt("%08x", r);
nonce = d_nonce;
}
combi = xs_fmt("%s:%s:%s", nonce, uid, passwd);
hash = xs_sha1_hex(combi, strlen(combi));
return xs_fmt("%s:%s", nonce, hash);
}
int check_password(const char *uid, const char *passwd, const char *hash)
/* checks a password */
{
int ret = 0;
xs *spl = xs_split_n(hash, ":", 1);
if (xs_list_len(spl) == 2) {
xs *n_hash = hash_password(uid, passwd, xs_list_get(spl, 0));
ret = (strcmp(hash, n_hash) == 0);
}
return ret;
}
int strip_media(const char *fn)
/* strips EXIF data from a file */
{
int ret = 0;
const xs_val *v = xs_dict_get(srv_config, "strip_exif");
if (xs_type(v) == XSTYPE_TRUE) {
xs *l_fn = xs_tolower_i(xs_dup(fn));
/* check extensions */
if (xs_endswith(l_fn, ".jpg") || xs_endswith(l_fn, ".jpeg") ||
xs_endswith(l_fn, ".png") || xs_endswith(l_fn, ".webp") ||
xs_endswith(l_fn, ".heic") || xs_endswith(l_fn, ".heif") ||
xs_endswith(l_fn, ".avif") || xs_endswith(l_fn, ".tiff") ||
xs_endswith(l_fn, ".gif") || xs_endswith(l_fn, ".bmp")) {
const char *mp = xs_dict_get(srv_config, "mogrify_path");
if (mp == NULL)
mp = "mogrify";
xs *cmd = xs_fmt("%s -strip \"%s\" 2>/dev/null", mp, fn);
ret = system(cmd);
if (ret != 0) {
int code = 0;
if (WIFEXITED(ret))
code = WEXITSTATUS(ret);
if (code == 127)
srv_log(xs_fmt("strip_media: error stripping %s. '%s' not found (exit 127). Set 'mogrify_path' in server.json.", fn, mp));
else
srv_log(xs_fmt("strip_media: error stripping %s %d", fn, ret));
}
else
srv_debug(1, xs_fmt("strip_media: stripped %s", fn));
}
}
return ret;
}
int check_strip_tool(void)
{
const xs_val *v = xs_dict_get(srv_config, "strip_exif");
int ret = 1;
if (xs_type(v) == XSTYPE_TRUE) {
const char *mp = xs_dict_get(srv_config, "mogrify_path");
if (mp == NULL)
mp = "mogrify";
xs *cmd = xs_fmt("%s -version 2>/dev/null >/dev/null", mp);
if (system(cmd) != 0)
ret = 0;
}
return ret;
}
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