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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_openssl.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 */
- {
- if (!xs_is_hex(id))
- return 500;
- 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 */
- {
- if (!xs_is_hex(id))
- return NULL;
- 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;
- }
- int app_del(const char *id)
- /* deletes an app */
- {
- if (!xs_is_hex(id))
- return -1;
- xs *fn = xs_fmt("%s/app/%s.json", srv_basedir, id);
- return unlink(fn);
- }
- int token_add(const char *id, const xs_dict *token)
- /* stores a token */
- {
- if (!xs_is_hex(id))
- return 500;
- int status = 201;
- xs *fn = xs_fmt("%s/token/", 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(token, 4);
- fwrite(j, strlen(j), 1, f);
- fclose(f);
- }
- else
- status = 500;
- return status;
- }
- xs_dict *token_get(const char *id)
- /* gets a token */
- {
- if (!xs_is_hex(id))
- return NULL;
- xs *fn = xs_fmt("%s/token/%s.json", srv_basedir, id);
- xs_dict *token = NULL;
- FILE *f;
- if ((f = fopen(fn, "r")) != NULL) {
- xs *j = xs_readall(f);
- fclose(f);
- token = xs_json_loads(j);
- }
- return token;
- }
- int token_del(const char *id)
- /* deletes a token */
- {
- if (!xs_is_hex(id))
- return -1;
- xs *fn = xs_fmt("%s/token/%s.json", srv_basedir, id);
- return unlink(fn);
- }
- 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: success, redirect to %s", *body));
- /* assign the login to the app */
- xs *app = app_get(cid);
- if (app != NULL) {
- app = xs_dict_set(app, "uid", login);
- app = xs_dict_set(app, "code", code);
- app_add(cid, app);
- }
- else
- srv_log(xs_fmt("oauth x-snac-login: error getting app %s", cid));
- }
- 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 *app = app_get(cid);
- if (app == NULL) {
- status = 401;
- srv_log(xs_fmt("oauth token: invalid app %s", cid));
- }
- else
- if (strcmp(csec, xs_dict_get(app, "client_secret")) != 0) {
- status = 401;
- srv_log(xs_fmt("oauth token: invalid client_secret for app %s", cid));
- }
- else {
- xs *rsp = xs_dict_new();
- xs *cat = xs_number_new(time(NULL));
- xs *tokid = random_str();
- rsp = xs_dict_append(rsp, "access_token", tokid);
- 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;
- const char *uid = xs_dict_get(app, "uid");
- srv_debug(0, xs_fmt("oauth token: "
- "successful login for %s, new token %s", uid, tokid));
- xs *token = xs_dict_new();
- token = xs_dict_append(token, "token", tokid);
- token = xs_dict_append(token, "client_id", cid);
- token = xs_dict_append(token, "client_secret", csec);
- token = xs_dict_append(token, "uid", uid);
- token = xs_dict_append(token, "code", code);
- token_add(tokid, 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 *tokid = xs_dict_get(msg, "token");
- if (cid && csec && tokid) {
- xs *token = token_get(tokid);
- *body = xs_str_new("{}");
- *ctype = "application/json";
- if (token == NULL || strcmp(csec, xs_dict_get(token, "client_secret")) != 0) {
- srv_debug(0, xs_fmt("oauth revoke: bad secret for token %s", tokid));
- status = 403;
- }
- else {
- token_del(tokid);
- srv_debug(0, xs_fmt("oauth revoke: revoked token %s", tokid));
- status = 200;
- /* also delete the app, as it serves no purpose from now on */
- app_del(cid);
- }
- }
- else {
- srv_debug(0, xs_fmt("oauth revoke: invalid or unset arguments"));
- status = 403;
- }
- }
- return status;
- }
- xs_str *mastoapi_id(const xs_dict *msg)
- /* returns a somewhat Mastodon-compatible status id */
- {
- char tmp[256] = "";
- int n = 0;
- const char *id = xs_dict_get(msg, "id");
- const char *published = xs_dict_get(msg, "published");
- if (!xs_is_null(published)) {
- /* transfer all numbers from the published date */
- while (*published && n < sizeof(tmp) - 1) {
- if (*published >= '0' && *published <= '9')
- tmp[n++] = *published;
- published++;
- }
- tmp[n] = '\0';
- }
- xs *md5 = xs_md5_hex(id, strlen(id));
- return xs_str_cat(xs_str_new(tmp), md5);
- }
- 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;
- srv_debug(0, xs_fmt("mastoapi_get_handler %s", q_path));
- {
- xs *j = xs_json_dumps_pp(req, 4);
- printf("mastoapi get:\n%s\n", j);
- }
- int status = 404;
- xs_dict *args = xs_dict_get(req, "q_vars");
- xs *cmd = xs_replace(q_path, "/api/v1", "");
- char *v;
- snac snac = {0};
- int logged_in = 0;
- /* if there is an authorization field, try to validate it */
- if (!xs_is_null(v = xs_dict_get(req, "authorization")) && xs_startswith(v, "Bearer ")) {
- xs *tokid = xs_replace(v, "Bearer ", "");
- xs *token = token_get(tokid);
- if (token != NULL) {
- const char *uid = xs_dict_get(token, "uid");
- if (!xs_is_null(uid) && user_open(&snac, uid)) {
- logged_in = 1;
- srv_debug(0, xs_fmt("mastoapi auth: valid token for user %s", uid));
- }
- else
- srv_log(xs_fmt("mastoapi auth: corrupted token %s", tokid));
- }
- else
- srv_log(xs_fmt("mastoapi auth: invalid token %s", tokid));
- }
- if (strcmp(cmd, "/accounts/verify_credentials") == 0) {
- if (logged_in) {
- xs *acct = xs_dict_new();
- acct = xs_dict_append(acct, "id", xs_dict_get(snac.config, "uid"));
- acct = xs_dict_append(acct, "username", xs_dict_get(snac.config, "uid"));
- acct = xs_dict_append(acct, "acct", xs_dict_get(snac.config, "uid"));
- acct = xs_dict_append(acct, "display_name", xs_dict_get(snac.config, "name"));
- acct = xs_dict_append(acct, "created_at", xs_dict_get(snac.config, "published"));
- acct = xs_dict_append(acct, "note", xs_dict_get(snac.config, "bio"));
- acct = xs_dict_append(acct, "url", snac.actor);
- xs *avatar = NULL;
- char *av = xs_dict_get(snac.config, "avatar");
- if (xs_is_null(av) || *av == '\0')
- avatar = xs_fmt("%s/susie.png", srv_baseurl);
- else
- avatar = xs_dup(av);
- acct = xs_dict_append(acct, "avatar", avatar);
- *body = xs_json_dumps_pp(acct, 4);
- *ctype = "application/json";
- status = 200;
- }
- else {
- status = 422; // "Unprocessable entity" (no login)
- }
- }
- else
- if (strcmp(cmd, "/timelines/home") == 0) {
- /* the private timeline */
- if (logged_in) {
- const char *max_id = xs_dict_get(args, "max_id");
- const char *since_id = xs_dict_get(args, "since_id");
- const char *min_id = xs_dict_get(args, "min_id");
- const char *limit_s = xs_dict_get(args, "limit");
- int limit = 0;
- int cnt = 0;
- if (!xs_is_null(limit_s))
- limit = atoi(limit_s);
- if (limit == 0)
- limit = 20;
- xs *timeline = timeline_simple_list(&snac, "private", 0, XS_ALL);
- xs *out = xs_list_new();
- xs_list *p = timeline;
- xs_str *v;
- while (xs_list_iter(&p, &v) && cnt < limit) {
- xs *msg = NULL;
- /* only return entries older that max_id */
- if (max_id) {
- if (strcmp(v, max_id) == 0)
- max_id = NULL;
- continue;
- }
- /* only returns entries newer than since_id */
- if (since_id) {
- if (strcmp(v, since_id) == 0)
- break;
- }
- /* only returns entries newer than min_id */
- /* what does really "Return results immediately newer than ID" mean? */
- if (min_id) {
- if (strcmp(v, min_id) == 0)
- break;
- }
- /* get the entry */
- if (!valid_status(timeline_get_by_md5(&snac, v, &msg)))
- continue;
- /* discard non-Notes */
- if (strcmp(xs_dict_get(msg, "type"), "Note") != 0)
- continue;
- xs *actor = NULL;
- actor_get(&snac, xs_dict_get(msg, "attributedTo"), &actor);
- /* if the author is not here, discard */
- if (actor == NULL)
- continue;
- /** shave the yak converting an ActivityPub Note to a Mastodon status **/
- xs *acct = xs_dict_new();
- const char *display_name = xs_dict_get(actor, "name");
- if (xs_is_null(display_name) || *display_name == '\0')
- display_name = xs_dict_get(actor, "preferredUsername");
- const char *id = xs_dict_get(actor, "id");
- const char *pub = xs_dict_get(actor, "published");
- xs *acct_md5 = xs_md5_hex(id, strlen(id));
- acct = xs_dict_append(acct, "id", acct_md5);
- acct = xs_dict_append(acct, "username", xs_dict_get(actor, "preferredUsername"));
- acct = xs_dict_append(acct, "acct", xs_dict_get(actor, "preferredUsername"));
- acct = xs_dict_append(acct, "display_name", display_name);
- if (pub)
- acct = xs_dict_append(acct, "created_at", pub);
- acct = xs_dict_append(acct, "note", xs_dict_get(actor, "summary"));
- acct = xs_dict_append(acct, "url", id);
- xs *avatar = NULL;
- xs_dict *av = xs_dict_get(actor, "icon");
- if (xs_type(av) == XSTYPE_DICT)
- avatar = xs_dup(xs_dict_get(av, "url"));
- else
- avatar = xs_fmt("%s/susie.png", srv_baseurl);
- acct = xs_dict_append(acct, "avatar", avatar);
- xs *f = xs_val_new(XSTYPE_FALSE);
- xs *t = xs_val_new(XSTYPE_TRUE);
- xs *n = xs_val_new(XSTYPE_NULL);
- xs *el = xs_list_new();
- xs *idx = NULL;
- xs *ixc = NULL;
- char *tmp;
- id = xs_dict_get(msg, "id");
- xs *mid = mastoapi_id(msg);
- xs *st = xs_dict_new();
- st = xs_dict_append(st, "id", mid);
- st = xs_dict_append(st, "uri", id);
- st = xs_dict_append(st, "url", id);
- st = xs_dict_append(st, "created_at", xs_dict_get(msg, "published"));
- st = xs_dict_append(st, "account", acct);
- st = xs_dict_append(st, "content", xs_dict_get(msg, "content"));
- st = xs_dict_append(st, "visibility",
- is_msg_public(&snac, msg) ? "public" : "private");
- tmp = xs_dict_get(msg, "sensitive");
- if (xs_is_null(tmp))
- tmp = f;
- st = xs_dict_append(st, "sensitive", tmp);
- tmp = xs_dict_get(msg, "summary");
- if (xs_is_null(tmp))
- tmp = "";
- st = xs_dict_append(st, "spoiler_text", tmp);
- st = xs_dict_append(st, "media_attachments", el);
- st = xs_dict_append(st, "mentions", el);
- st = xs_dict_append(st, "tags", el);
- st = xs_dict_append(st, "emojis", el);
- xs_free(idx);
- xs_free(ixc);
- idx = object_likes(id);
- ixc = xs_number_new(xs_list_len(idx));
- st = xs_dict_append(st, "favourites_count", ixc);
- st = xs_dict_append(st, "favourited",
- xs_list_in(idx, snac.md5) != -1 ? t : f);
- xs_free(idx);
- xs_free(ixc);
- idx = object_announces(id);
- ixc = xs_number_new(xs_list_len(idx));
- st = xs_dict_append(st, "reblogs_count", ixc);
- st = xs_dict_append(st, "reblogged",
- xs_list_in(idx, snac.md5) != -1 ? t : f);
- xs_free(idx);
- xs_free(ixc);
- idx = object_children(id);
- ixc = xs_number_new(xs_list_len(idx));
- st = xs_dict_append(st, "replies_count", ixc);
- /* default in_reply_to values */
- st = xs_dict_append(st, "in_reply_to_id", n);
- st = xs_dict_append(st, "in_reply_to_account_id", n);
- tmp = xs_dict_get(msg, "inReplyTo");
- if (!xs_is_null(tmp)) {
- xs *irto = NULL;
- if (valid_status(object_get(tmp, &irto))) {
- xs *irt_mid = mastoapi_id(irto);
- st = xs_dict_set(st, "in_reply_to_id", irt_mid);
- char *at = NULL;
- if (!xs_is_null(at = xs_dict_get(irto, "attributedTo"))) {
- xs *at_md5 = xs_md5_hex(at, strlen(at));
- st = xs_dict_set(st, "in_reply_to_account_id", at_md5);
- }
- }
- }
- st = xs_dict_append(st, "reblog", n);
- st = xs_dict_append(st, "poll", n);
- st = xs_dict_append(st, "card", n);
- st = xs_dict_append(st, "language", n);
- tmp = xs_dict_get(msg, "sourceContent");
- if (xs_is_null(tmp))
- tmp = "";
- st = xs_dict_append(st, "text", tmp);
- tmp = xs_dict_get(msg, "updated");
- if (xs_is_null(tmp))
- tmp = n;
- st = xs_dict_append(st, "edited_at", tmp);
- out = xs_list_append(out, st);
- cnt++;
- }
- *body = xs_json_dumps_pp(out, 4);
- *ctype = "application/json";
- status = 200;
- srv_debug(0, xs_fmt("mastoapi timeline: returned %d entries", xs_list_len(out)));
- }
- else {
- status = 401; // unauthorized
- }
- }
- else
- if (strcmp(cmd, "/timelines/public") == 0) {
- /* the public timeline */
- }
- /* user cleanup */
- if (logged_in)
- user_free(&snac);
- 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;
- srv_debug(0, xs_fmt("mastoapi_post_handler %s", q_path));
- {
- 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(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");
- const char *scope = xs_dict_get(msg, "scope");
- if (xs_type(ruri) == XSTYPE_LIST)
- ruri = xs_dict_get(ruri, 0);
- 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", "");
- if (scope)
- app = xs_dict_append(app, "scope", scope);
- app_add(cid, app);
- srv_debug(0, xs_fmt("mastoapi apps: new app %s", cid));
- }
- }
- return status;
- }
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