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/* snac - A simple, minimalistic ActivityPub instance */
/* copyright (c) 2022 - 2023 grunfink / MIT license */
#include "xs.h"
#include "xs_encdec.h"
#include "xs_json.h"
#include "xs_io.h"
#include "xs_time.h"
#include "snac.h"
static xs_str *random_str(void)
/* just what is says in the tin */
{
unsigned int data[4] = {0};
FILE *f;
if ((f = fopen("/dev/random", "r")) != NULL) {
fread(data, sizeof(data), 1, f);
fclose(f);
}
else {
data[0] = random() % 0xffffffff;
data[1] = random() % 0xffffffff;
data[2] = random() % 0xffffffff;
data[3] = random() % 0xffffffff;
}
return xs_hex_enc((char *)data, sizeof(data));
}
int app_add(const char *id, const xs_dict *app)
/* stores an app */
{
int status = 201;
xs *fn = xs_fmt("%s/app/", srv_basedir);
FILE *f;
mkdirx(fn);
fn = xs_str_cat(fn, id);
fn = xs_str_cat(fn, ".json");
if ((f = fopen(fn, "w")) != NULL) {
xs *j = xs_json_dumps_pp(app, 4);
fwrite(j, strlen(j), 1, f);
fclose(f);
}
else
status = 500;
return status;
}
xs_dict *app_get(const char *id)
/* gets an app */
{
xs *fn = xs_fmt("%s/app/%s.json", srv_basedir, id);
xs_dict *app = NULL;
FILE *f;
if ((f = fopen(fn, "r")) != NULL) {
xs *j = xs_readall(f);
fclose(f);
app = xs_json_loads(j);
}
return app;
}
const char *login_page = ""
"<!DOCTYPE html>\n"
"<body><h1>%s OAuth identify</h1>\n"
"<div style=\"background-color: red; color: white\">%s</div>\n"
"<form method=\"post\" action=\"https:/" "/%s/oauth/x-snac-login\">\n"
"<p>Login: <input type=\"text\" name=\"login\"></p>\n"
"<p>Password: <input type=\"password\" name=\"passwd\"></p>\n"
"<input type=\"hidden\" name=\"redir\" value=\"%s\">\n"
"<input type=\"hidden\" name=\"cid\" value=\"%s\">\n"
"<input type=\"submit\" value=\"OK\">\n"
"</form><p>%s</p></body>\n"
"";
int oauth_get_handler(const xs_dict *req, const char *q_path,
char **body, int *b_size, char **ctype)
{
if (!xs_startswith(q_path, "/oauth/"))
return 0;
{
xs *j = xs_json_dumps_pp(req, 4);
printf("oauth get:\n%s\n", j);
}
int status = 404;
xs_dict *msg = xs_dict_get(req, "q_vars");
xs *cmd = xs_replace(q_path, "/oauth", "");
srv_debug(0, xs_fmt("oauth_get_handler %s", q_path));
if (strcmp(cmd, "/authorize") == 0) {
const char *cid = xs_dict_get(msg, "client_id");
const char *ruri = xs_dict_get(msg, "redirect_uri");
const char *rtype = xs_dict_get(msg, "response_type");
status = 400;
if (cid && ruri && rtype && strcmp(rtype, "code") == 0) {
xs *app = app_get(cid);
if (app != NULL) {
const char *host = xs_dict_get(srv_config, "host");
*body = xs_fmt(login_page, host, "", host, ruri, cid, USER_AGENT);
*ctype = "text/html";
status = 200;
srv_debug(0, xs_fmt("oauth authorize: generating login page"));
}
else
srv_debug(0, xs_fmt("oauth authorize: bad client_id %s", cid));
}
else
srv_debug(0, xs_fmt("oauth authorize: invalid or unset arguments"));
}
return status;
}
int oauth_post_handler(const xs_dict *req, const char *q_path,
const char *payload, int p_size,
char **body, int *b_size, char **ctype)
{
if (!xs_startswith(q_path, "/oauth/"))
return 0;
{
xs *j = xs_json_dumps_pp(req, 4);
printf("oauth post:\n%s\n", j);
}
int status = 404;
xs_dict *msg = xs_dict_get(req, "p_vars");
xs *cmd = xs_replace(q_path, "/oauth", "");
srv_debug(0, xs_fmt("oauth_post_handler %s", q_path));
if (strcmp(cmd, "/x-snac-login") == 0) {
const char *login = xs_dict_get(msg, "login");
const char *passwd = xs_dict_get(msg, "passwd");
const char *redir = xs_dict_get(msg, "redir");
const char *cid = xs_dict_get(msg, "cid");
const char *host = xs_dict_get(srv_config, "host");
/* by default, generate another login form with an error */
*body = xs_fmt(login_page, host, "LOGIN INCORRECT", host, redir, cid, USER_AGENT);
*ctype = "text/html";
status = 200;
if (login && passwd && redir && cid) {
snac snac;
if (user_open(&snac, login)) {
/* check the login + password */
if (check_password(login, passwd,
xs_dict_get(snac.config, "passwd"))) {
/* success! redirect to the desired uri */
xs *code = random_str();
xs_free(*body);
*body = xs_fmt("%s?code=%s", redir, code);
status = 303;
srv_debug(0, xs_fmt("oauth x-snac-login: redirect to %s", *body));
}
else
srv_debug(0, xs_fmt("oauth x-snac-login: login '%s' incorrect", login));
user_free(&snac);
}
else
srv_debug(0, xs_fmt("oauth x-snac-login: bad user '%s'", login));
}
else
srv_debug(0, xs_fmt("oauth x-snac-login: invalid or unset arguments"));
}
else
if (strcmp(cmd, "/token") == 0) {
const char *gtype = xs_dict_get(msg, "grant_type");
const char *code = xs_dict_get(msg, "code");
const char *cid = xs_dict_get(msg, "client_id");
const char *csec = xs_dict_get(msg, "client_secret");
const char *ruri = xs_dict_get(msg, "redirect_uri");
if (gtype && code && cid && csec && ruri) {
xs *rsp = xs_dict_new();
xs *cat = xs_number_new(time(NULL));
xs *token = random_str();
rsp = xs_dict_append(rsp, "access_token", token);
rsp = xs_dict_append(rsp, "token_type", "Bearer");
rsp = xs_dict_append(rsp, "created_at", cat);
*body = xs_json_dumps_pp(rsp, 4);
*ctype = "application/json";
status = 200;
srv_debug(0, xs_fmt("oauth token: successful login, token %s", token));
}
else {
srv_debug(0, xs_fmt("oauth token: invalid or unset arguments"));
status = 400;
}
}
else
if (strcmp(cmd, "/revoke") == 0) {
const char *cid = xs_dict_get(msg, "client_id");
const char *csec = xs_dict_get(msg, "client_secret");
const char *token = xs_dict_get(msg, "token");
if (cid && csec && token) {
*body = xs_str_new("{}");
*ctype = "application/json";
status = 200;
}
else
status = 400;
}
return status;
}
int mastoapi_get_handler(const xs_dict *req, const char *q_path,
char **body, int *b_size, char **ctype)
{
if (!xs_startswith(q_path, "/api/v1/"))
return 0;
{
xs *j = xs_json_dumps_pp(req, 4);
printf("mastoapi get:\n%s\n", j);
}
int status = 404;
xs_dict *msg = xs_dict_get(req, "q_vars");
xs *cmd = xs_replace(q_path, "/api/v1", "");
srv_debug(0, xs_fmt("mastoapi_get_handler %s", q_path));
if (strcmp(cmd, "/accounts/verify_credentials") == 0) {
}
return status;
}
int mastoapi_post_handler(const xs_dict *req, const char *q_path,
const char *payload, int p_size,
char **body, int *b_size, char **ctype)
{
if (!xs_startswith(q_path, "/api/v1/"))
return 0;
{
xs *j = xs_json_dumps_pp(req, 4);
printf("mastoapi post:\n%s\n", j);
}
int status = 404;
xs *msg = NULL;
char *i_ctype = xs_dict_get(req, "content-type");
if (xs_startswith(i_ctype, "application/json"))
msg = xs_json_loads(payload);
else
msg = xs_dup(xs_dict_get(req, "p_vars"));
if (msg == NULL)
return 400;
{
xs *j = xs_json_dumps_pp(req, 4);
printf("%s\n", j);
}
{
xs *j = xs_json_dumps_pp(msg, 4);
printf("%s\n", j);
}
xs *cmd = xs_replace(q_path, "/api/v1", "");
if (strcmp(cmd, "/apps") == 0) {
const char *name = xs_dict_get(msg, "client_name");
const char *ruri = xs_dict_get(msg, "redirect_uris");
if (name && ruri) {
xs *app = xs_dict_new();
xs *id = xs_replace_i(tid(0), ".", "");
xs *cid = random_str();
xs *csec = random_str();
xs *vkey = random_str();
app = xs_dict_append(app, "name", name);
app = xs_dict_append(app, "redirect_uri", ruri);
app = xs_dict_append(app, "client_id", cid);
app = xs_dict_append(app, "client_secret", csec);
app = xs_dict_append(app, "vapid_key", vkey);
app = xs_dict_append(app, "id", id);
*body = xs_json_dumps_pp(app, 4);
*ctype = "application/json";
status = 200;
app = xs_dict_append(app, "code", "");
app_add(cid, app);
}
}
return status;
}
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