snac2/data.c
2023-03-02 09:15:40 +01:00

1942 lines
44 KiB
C

/* snac - A simple, minimalistic ActivityPub instance */
/* copyright (c) 2022 - 2023 grunfink / MIT license */
#include "xs.h"
#include "xs_io.h"
#include "xs_json.h"
#include "xs_openssl.h"
#include "xs_glob.h"
#include "xs_set.h"
#include "snac.h"
#include <time.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <fcntl.h>
#include <pthread.h>
double disk_layout = 2.7;
/* storage serializer */
pthread_mutex_t data_mutex = {0};
int snac_upgrade(d_char **error);
int srv_open(char *basedir, int auto_upgrade)
/* opens a server */
{
int ret = 0;
xs *cfg_file = NULL;
FILE *f;
d_char *error = NULL;
pthread_mutex_init(&data_mutex, NULL);
srv_basedir = xs_str_new(basedir);
if (xs_endswith(srv_basedir, "/"))
srv_basedir = xs_crop_i(srv_basedir, 0, -1);
cfg_file = xs_fmt("%s/server.json", basedir);
if ((f = fopen(cfg_file, "r")) == NULL)
error = xs_fmt("ERROR: cannot opening '%s'", cfg_file);
else {
xs *cfg_data;
/* read full config file */
cfg_data = xs_readall(f);
fclose(f);
/* parse */
srv_config = xs_json_loads(cfg_data);
if (srv_config == NULL)
error = xs_fmt("ERROR: cannot parse '%s'", cfg_file);
else {
char *host;
char *prefix;
char *dbglvl;
host = xs_dict_get(srv_config, "host");
prefix = xs_dict_get(srv_config, "prefix");
dbglvl = xs_dict_get(srv_config, "dbglevel");
if (host == NULL || prefix == NULL)
error = xs_str_new("ERROR: cannot get server data");
else {
srv_baseurl = xs_fmt("https://%s%s", host, prefix);
dbglevel = (int) xs_number_get(dbglvl);
if ((dbglvl = getenv("DEBUG")) != NULL) {
dbglevel = atoi(dbglvl);
error = xs_fmt("DEBUG level set to %d from environment", dbglevel);
}
if (auto_upgrade)
ret = snac_upgrade(&error);
else {
if (xs_number_get(xs_dict_get(srv_config, "layout")) < disk_layout)
error = xs_fmt("ERROR: disk layout changed - execute 'snac upgrade' first");
else
ret = 1;
}
}
}
}
if (error != NULL)
srv_log(error);
/* create the queue/ subdir, just in case */
xs *qdir = xs_fmt("%s/queue", srv_basedir);
mkdirx(qdir);
xs *ibdir = xs_fmt("%s/inbox", srv_basedir);
mkdirx(ibdir);
#ifdef __OpenBSD__
char *v = xs_dict_get(srv_config, "disable_openbsd_security");
if (v && xs_type(v) == XSTYPE_TRUE) {
srv_debug(1, xs_dup("OpenBSD security disabled by admin"));
}
else {
srv_debug(1, xs_fmt("Calling unveil()"));
unveil(basedir, "rwc");
unveil("/usr/sbin/sendmail", "x");
unveil("/etc/resolv.conf", "r");
unveil("/etc/hosts", "r");
unveil("/etc/ssl/openssl.cnf", "r");
unveil("/etc/ssl/cert.pem", "r");
unveil("/usr/share/zoneinfo", "r");
unveil(NULL, NULL);
srv_debug(1, xs_fmt("Calling pledge()"));
pledge("stdio rpath wpath cpath flock inet proc exec dns fattr", NULL);
}
#endif /* __OpenBSD__ */
return ret;
}
void srv_free(void)
{
xs_free(srv_basedir);
xs_free(srv_config);
xs_free(srv_baseurl);
pthread_mutex_destroy(&data_mutex);
}
void user_free(snac *snac)
/* frees a user snac */
{
xs_free(snac->uid);
xs_free(snac->basedir);
xs_free(snac->config);
xs_free(snac->config_o);
xs_free(snac->key);
xs_free(snac->actor);
xs_free(snac->md5);
}
int user_open(snac *snac, const char *uid)
/* opens a user */
{
int ret = 0;
memset(snac, '\0', sizeof(struct _snac));
if (validate_uid(uid)) {
xs *cfg_file;
FILE *f;
snac->uid = xs_str_new(uid);
snac->basedir = xs_fmt("%s/user/%s", srv_basedir, uid);
cfg_file = xs_fmt("%s/user.json", snac->basedir);
if ((f = fopen(cfg_file, "r")) != NULL) {
xs *cfg_data;
/* read full config file */
cfg_data = xs_readall(f);
fclose(f);
if ((snac->config = xs_json_loads(cfg_data)) != NULL) {
xs *key_file = xs_fmt("%s/key.json", snac->basedir);
if ((f = fopen(key_file, "r")) != NULL) {
xs *key_data;
key_data = xs_readall(f);
fclose(f);
if ((snac->key = xs_json_loads(key_data)) != NULL) {
snac->actor = xs_fmt("%s/%s", srv_baseurl, uid);
snac->md5 = xs_md5_hex(snac->actor, strlen(snac->actor));
/* everything is ok right now */
ret = 1;
/* does it have a configuration override? */
xs *cfg_file_o = xs_fmt("%s/user_o.json", snac->basedir);
if ((f = fopen(cfg_file_o, "r")) != NULL) {
xs *j = xs_readall(f);
fclose(f);
if ((snac->config_o = xs_json_loads(j)) == NULL)
srv_log(xs_fmt("error parsing '%s'", cfg_file_o));
}
if (snac->config_o == NULL)
snac->config_o = xs_dict_new();
}
else
srv_log(xs_fmt("error parsing '%s'", key_file));
}
else
srv_log(xs_fmt("error opening '%s' %d", key_file, errno));
}
else
srv_log(xs_fmt("error parsing '%s'", cfg_file));
}
else
srv_debug(2, xs_fmt("error opening '%s' %d", cfg_file, errno));
}
else
srv_debug(1, xs_fmt("invalid user '%s'", uid));
if (!ret)
user_free(snac);
return ret;
}
d_char *user_list(void)
/* returns the list of user ids */
{
xs *spec = xs_fmt("%s/user/" "*", srv_basedir);
return xs_glob(spec, 1, 0);
}
double mtime_nl(const char *fn, int *n_link)
/* returns the mtime and number of links of a file or directory, or 0.0 */
{
struct stat st;
double r = 0.0;
int n = 0;
if (fn && stat(fn, &st) != -1) {
r = (double) st.st_mtim.tv_sec;
n = st.st_nlink;
}
if (n_link)
*n_link = n;
return r;
}
/** database 2.1+ **/
/** indexes **/
int index_add_md5(const char *fn, const char *md5)
/* adds an md5 to an index */
{
int status = 201; /* Created */
FILE *f;
pthread_mutex_lock(&data_mutex);
if ((f = fopen(fn, "a")) != NULL) {
flock(fileno(f), LOCK_EX);
/* ensure the position is at the end after getting the lock */
fseek(f, 0, SEEK_END);
fprintf(f, "%s\n", md5);
fclose(f);
}
else
status = 500;
pthread_mutex_unlock(&data_mutex);
return status;
}
int index_add(const char *fn, const char *id)
/* adds an id to an index */
{
xs *md5 = xs_md5_hex(id, strlen(id));
return index_add_md5(fn, md5);
}
int index_gc(const char *fn)
/* garbage-collects an index, deleting objects that are not here */
{
FILE *i, *o;
int gc = -1;
pthread_mutex_lock(&data_mutex);
if ((i = fopen(fn, "r")) != NULL) {
xs *nfn = xs_fmt("%s.new", fn);
char line[256];
if ((o = fopen(nfn, "w")) != NULL) {
gc = 0;
while (fgets(line, sizeof(line), i) != NULL) {
line[32] = '\0';
if (object_here_by_md5(line))
fprintf(o, "%s\n", line);
else
gc++;
}
fclose(o);
xs *ofn = xs_fmt("%s.bak", fn);
unlink(ofn);
link(fn, ofn);
rename(nfn, fn);
}
fclose(i);
}
pthread_mutex_unlock(&data_mutex);
return gc;
}
int index_in_md5(const char *fn, const char *md5)
/* checks if the md5 is already in the index */
{
FILE *f;
int ret = 0;
if ((f = fopen(fn, "r")) != NULL) {
flock(fileno(f), LOCK_SH);
char line[256];
while (!ret && fgets(line, sizeof(line), f) != NULL) {
line[32] = '\0';
if (strcmp(line, md5) == 0)
ret = 1;
}
fclose(f);
}
return ret;
}
int index_in(const char *fn, const char *id)
/* checks if the object id is already in the index */
{
xs *md5 = xs_md5_hex(id, strlen(id));
return index_in_md5(fn, md5);
}
int index_first(const char *fn, char *line, int size)
/* reads the first entry of an index */
{
FILE *f;
int ret = 0;
if ((f = fopen(fn, "r")) != NULL) {
flock(fileno(f), LOCK_SH);
if (fgets(line, size, f) != NULL) {
line[32] = '\0';
ret = 1;
}
fclose(f);
}
return ret;
}
int index_len(const char *fn)
/* returns the number of elements in an index */
{
struct stat st;
int len = 0;
if (stat(fn, &st) != -1)
len = st.st_size / 33;
return len;
}
d_char *index_list(const char *fn, int max)
/* returns an index as a list */
{
d_char *list = NULL;
FILE *f;
int n = 0;
if ((f = fopen(fn, "r")) != NULL) {
flock(fileno(f), LOCK_SH);
char line[256];
list = xs_list_new();
while (n < max && fgets(line, sizeof(line), f) != NULL) {
line[32] = '\0';
list = xs_list_append(list, line);
n++;
}
fclose(f);
}
return list;
}
d_char *index_list_desc(const char *fn, int skip, int show)
/* returns an index as a list, in reverse order */
{
d_char *list = NULL;
FILE *f;
int n = 0;
if ((f = fopen(fn, "r")) != NULL) {
flock(fileno(f), LOCK_SH);
char line[256];
list = xs_list_new();
/* move to the end minus one entry (or more, if skipping entries) */
if (!fseek(f, 0, SEEK_END) && !fseek(f, (skip + 1) * -33, SEEK_CUR)) {
while (n < show && fgets(line, sizeof(line), f) != NULL) {
line[32] = '\0';
list = xs_list_append(list, line);
n++;
/* move backwards 2 entries */
if (fseek(f, -66, SEEK_CUR) == -1)
break;
}
}
fclose(f);
}
return list;
}
/** objects **/
d_char *_object_fn_by_md5(const char *md5)
{
xs *bfn = xs_fmt("%s/object/%c%c", srv_basedir, md5[0], md5[1]);
mkdirx(bfn);
return xs_fmt("%s/%s.json", bfn, md5);
}
d_char *_object_fn(const char *id)
{
xs *md5 = xs_md5_hex(id, strlen(id));
return _object_fn_by_md5(md5);
}
int object_here_by_md5(char *id)
/* checks if an object is already downloaded */
{
xs *fn = _object_fn_by_md5(id);
return mtime(fn) > 0.0;
}
int object_here(char *id)
/* checks if an object is already downloaded */
{
xs *fn = _object_fn(id);
return mtime(fn) > 0.0;
}
int object_get_by_md5(const char *md5, xs_dict **obj)
/* returns a stored object, optionally of the requested type */
{
int status = 404;
xs *fn = _object_fn_by_md5(md5);
FILE *f;
if ((f = fopen(fn, "r")) != NULL) {
flock(fileno(f), LOCK_SH);
xs *j = xs_readall(f);
fclose(f);
*obj = xs_json_loads(j);
if (*obj)
status = 200;
}
else
*obj = NULL;
return status;
}
int object_get(const char *id, xs_dict **obj)
/* returns a stored object, optionally of the requested type */
{
xs *md5 = xs_md5_hex(id, strlen(id));
return object_get_by_md5(md5, obj);
}
int _object_add(const char *id, d_char *obj, int ow)
/* stores an object */
{
int status = 201; /* Created */
xs *fn = _object_fn(id);
FILE *f;
if (!ow && mtime(fn) > 0.0) {
/* object already here */
srv_debug(1, xs_fmt("object_add object already here %s", id));
return 204; /* No content */
}
if ((f = fopen(fn, "w")) != NULL) {
flock(fileno(f), LOCK_EX);
xs *j = xs_json_dumps_pp(obj, 4);
fwrite(j, strlen(j), 1, f);
fclose(f);
/* does this object has a parent? */
char *in_reply_to = xs_dict_get(obj, "inReplyTo");
if (!xs_is_null(in_reply_to) && *in_reply_to) {
/* update the children index of the parent */
xs *c_idx = _object_fn(in_reply_to);
c_idx = xs_replace_i(c_idx, ".json", "_c.idx");
if (!index_in(c_idx, id)) {
index_add(c_idx, id);
srv_debug(1, xs_fmt("object_add added child %s to %s", id, c_idx));
}
else
srv_debug(1, xs_fmt("object_add %s child already in %s", id, c_idx));
/* create a one-element index with the parent */
xs *p_idx = xs_replace(fn, ".json", "_p.idx");
if (mtime(p_idx) == 0.0) {
index_add(p_idx, in_reply_to);
srv_debug(1, xs_fmt("object_add added parent %s to %s", in_reply_to, p_idx));
}
}
}
else {
srv_log(xs_fmt("object_add error writing %s (errno: %d)", fn, errno));
status = 500;
}
srv_debug(1, xs_fmt("object_add %s %s %d", id, fn, status));
return status;
}
int object_add(const char *id, d_char *obj)
/* stores an object */
{
return _object_add(id, obj, 0);
}
int object_add_ow(const char *id, d_char *obj)
/* stores an object (overwriting allowed) */
{
return _object_add(id, obj, 1);
}
int object_del_by_md5(const char *md5)
/* deletes an object by its md5 */
{
int status = 404;
xs *fn = _object_fn_by_md5(md5);
if (unlink(fn) != -1) {
status = 200;
/* also delete associated indexes */
xs *spec = xs_dup(fn);
spec = xs_replace_i(spec, ".json", "*.idx");
xs *files = xs_glob(spec, 0, 0);
char *p, *v;
p = files;
while (xs_list_iter(&p, &v)) {
srv_debug(1, xs_fmt("object_del index %s", v));
unlink(v);
}
}
srv_debug(1, xs_fmt("object_del %s %d", fn, status));
return status;
}
int object_del(const char *id)
/* deletes an object */
{
xs *md5 = xs_md5_hex(id, strlen(id));
return object_del_by_md5(md5);
}
int object_del_if_unref(const char *id)
/* deletes an object if its n_links < 2 */
{
xs *fn = _object_fn(id);
int n_links;
int ret = 0;
if (mtime_nl(fn, &n_links) > 0.0 && n_links < 2)
ret = object_del(id);
return ret;
}
d_char *_object_index_fn(const char *id, const char *idxsfx)
/* returns the filename of an object's index */
{
d_char *fn = _object_fn(id);
return xs_replace_i(fn, ".json", idxsfx);
}
int object_likes_len(const char *id)
/* returns the number of likes (without reading the index) */
{
xs *fn = _object_index_fn(id, "_l.idx");
return index_len(fn);
}
int object_announces_len(const char *id)
/* returns the number of announces (without reading the index) */
{
xs *fn = _object_index_fn(id, "_a.idx");
return index_len(fn);
}
d_char *object_children(const char *id)
/* returns the list of an object's children */
{
xs *fn = _object_index_fn(id, "_c.idx");
return index_list(fn, XS_ALL);
}
d_char *object_likes(const char *id)
{
xs *fn = _object_index_fn(id, "_l.idx");
return index_list(fn, XS_ALL);
}
d_char *object_announces(const char *id)
{
xs *fn = _object_index_fn(id, "_a.idx");
return index_list(fn, XS_ALL);
}
int object_parent(const char *id, char *buf, int size)
/* returns the object parent, if any */
{
xs *fn = _object_fn_by_md5(id);
fn = xs_replace_i(fn, ".json", "_p.idx");
return index_first(fn, buf, size);
}
int object_admire(const char *id, const char *actor, int like)
/* actor likes or announces this object */
{
int status = 200;
xs *fn = _object_fn(id);
fn = xs_replace_i(fn, ".json", like ? "_l.idx" : "_a.idx");
if (!index_in(fn, actor)) {
status = index_add(fn, actor);
srv_debug(1, xs_fmt("object_admire (%s) %s %s", like ? "Like" : "Announce", actor, fn));
}
return status;
}
int _object_user_cache(snac *snac, const char *id, const char *cachedir, int del)
/* adds or deletes from a user cache */
{
xs *ofn = _object_fn(id);
xs *l = xs_split(ofn, "/");
xs *cfn = xs_fmt("%s/%s/%s", snac->basedir, cachedir, xs_list_get(l, -1));
xs *idx = xs_fmt("%s/%s.idx", snac->basedir, cachedir);
int ret;
if (del) {
ret = unlink(cfn);
}
else {
if ((ret = link(ofn, cfn)) != -1)
index_add(idx, id);
}
return ret;
}
int object_user_cache_add(snac *snac, const char *id, const char *cachedir)
/* caches an object into a user cache */
{
return _object_user_cache(snac, id, cachedir, 0);
}
int object_user_cache_del(snac *snac, const char *id, const char *cachedir)
/* deletes an object from a user cache */
{
return _object_user_cache(snac, id, cachedir, 1);
}
int object_user_cache_in(snac *snac, const char *id, const char *cachedir)
/* checks if an object is stored in a cache */
{
xs *md5 = xs_md5_hex(id, strlen(id));
xs *cfn = xs_fmt("%s/%s/%s.json", snac->basedir, cachedir, md5);
return !!(mtime(cfn) != 0.0);
}
d_char *object_user_cache_list(snac *snac, const char *cachedir, int max)
/* returns the objects in a cache as a list */
{
xs *idx = xs_fmt("%s/%s.idx", snac->basedir, cachedir);
return index_list(idx, max);
}
/** specialized functions **/
/** followers **/
int follower_add(snac *snac, const char *actor)
/* adds a follower */
{
int ret = object_user_cache_add(snac, actor, "followers");
snac_debug(snac, 2, xs_fmt("follower_add %s", actor));
return ret == -1 ? 500 : 200;
}
int follower_del(snac *snac, const char *actor)
/* deletes a follower */
{
int ret = object_user_cache_del(snac, actor, "followers");
snac_debug(snac, 2, xs_fmt("follower_del %s", actor));
return ret == -1 ? 404 : 200;
}
int follower_check(snac *snac, const char *actor)
/* checks if someone is a follower */
{
return object_user_cache_in(snac, actor, "followers");
}
d_char *follower_list(snac *snac)
/* returns the list of followers */
{
xs *list = object_user_cache_list(snac, "followers", XS_ALL);
d_char *fwers = xs_list_new();
char *p, *v;
/* resolve the list of md5 to be a list of actors */
p = list;
while (xs_list_iter(&p, &v)) {
xs *a_obj = NULL;
if (valid_status(object_get_by_md5(v, &a_obj))) {
char *actor = xs_dict_get(a_obj, "id");
if (!xs_is_null(actor))
fwers = xs_list_append(fwers, actor);
}
}
return fwers;
}
/** timeline **/
double timeline_mtime(snac *snac)
{
xs *fn = xs_fmt("%s/private.idx", snac->basedir);
return mtime(fn);
}
xs_str *timeline_fn_by_md5(snac *snac, const char *md5)
/* get the filename of an entry by md5 from any timeline */
{
xs_str *fn = xs_fmt("%s/private/%s.json", snac->basedir, md5);
if (mtime(fn) == 0.0) {
fn = xs_free(fn);
fn = xs_fmt("%s/public/%s.json", snac->basedir, md5);
if (mtime(fn) == 0.0)
fn = xs_free(fn);
}
return fn;
}
int timeline_here(snac *snac, const char *md5)
/* checks if an object is in the user cache */
{
xs *fn = timeline_fn_by_md5(snac, md5);
return !(fn == NULL);
}
int timeline_get_by_md5(snac *snac, const char *md5, xs_dict **msg)
/* gets a message from the timeline */
{
int status = 404;
FILE *f = NULL;
xs *fn = timeline_fn_by_md5(snac, md5);
if (fn != NULL && (f = fopen(fn, "r")) != NULL) {
flock(fileno(f), LOCK_SH);
xs *j = xs_readall(f);
fclose(f);
if ((*msg = xs_json_loads(j)) != NULL)
status = 200;
}
return status;
}
int timeline_del(snac *snac, char *id)
/* deletes a message from the timeline */
{
/* delete from the user's caches */
object_user_cache_del(snac, id, "public");
object_user_cache_del(snac, id, "private");
/* try to delete the object if it's not used elsewhere */
return object_del_if_unref(id);
}
void timeline_update_indexes(snac *snac, const char *id)
/* updates the indexes */
{
object_user_cache_add(snac, id, "private");
if (xs_startswith(id, snac->actor)) {
xs *msg = NULL;
if (valid_status(object_get(id, &msg))) {
/* if its ours and is public, also store in public */
if (is_msg_public(snac, msg))
object_user_cache_add(snac, id, "public");
}
}
}
int timeline_add(snac *snac, char *id, char *o_msg)
/* adds a message to the timeline */
{
int ret = object_add(id, o_msg);
timeline_update_indexes(snac, id);
snac_debug(snac, 1, xs_fmt("timeline_add %s", id));
return ret;
}
void timeline_admire(snac *snac, char *id, char *admirer, int like)
/* updates a timeline entry with a new admiration */
{
/* if we are admiring this, add to both timelines */
if (!like && strcmp(admirer, snac->actor) == 0) {
object_user_cache_add(snac, id, "public");
object_user_cache_add(snac, id, "private");
}
object_admire(id, admirer, like);
snac_debug(snac, 1, xs_fmt("timeline_admire (%s) %s %s",
like ? "Like" : "Announce", id, admirer));
}
xs_list *timeline_top_level(snac *snac, xs_list *list)
/* returns the top level md5 entries from this index */
{
xs_set seen;
xs_list *p;
xs_str *v;
xs_set_init(&seen);
p = list;
while (xs_list_iter(&p, &v)) {
char line[256] = "";
strcpy(line, v);
for (;;) {
char line2[256];
/* if it doesn't have a parent, use this */
if (!object_parent(line, line2, sizeof(line2)))
break;
/* well, there is a parent... but is it here? */
if (!timeline_here(snac, line2))
break;
/* it's here! try again with its own parent */
strcpy(line, line2);
}
xs_set_add(&seen, line);
}
return xs_set_result(&seen);
}
d_char *timeline_simple_list(snac *snac, const char *idx_name, int skip, int show)
/* returns a timeline (with all entries) */
{
int c_max;
/* maximum number of items in the timeline */
c_max = xs_number_get(xs_dict_get(srv_config, "max_timeline_entries"));
/* never more timeline entries than the configured maximum */
if (show > c_max)
show = c_max;
xs *idx = xs_fmt("%s/%s.idx", snac->basedir, idx_name);
return index_list_desc(idx, skip, show);
}
d_char *timeline_list(snac *snac, const char *idx_name, int skip, int show)
/* returns a timeline (only top level entries) */
{
xs *list = timeline_simple_list(snac, idx_name, skip, show);
return timeline_top_level(snac, list);
}
/** following **/
/* this needs special treatment and cannot use the object db as is,
with a link to a cached author, because we need the Follow object
in case we need to unfollow (Undo + original Follow) */
d_char *_following_fn(snac *snac, char *actor)
{
xs *md5 = xs_md5_hex(actor, strlen(actor));
return xs_fmt("%s/following/%s.json", snac->basedir, md5);
}
int following_add(snac *snac, char *actor, char *msg)
/* adds to the following list */
{
int ret = 201; /* created */
xs *fn = _following_fn(snac, actor);
FILE *f;
if ((f = fopen(fn, "w")) != NULL) {
xs *j = xs_json_dumps_pp(msg, 4);
fwrite(j, 1, strlen(j), f);
fclose(f);
}
else
ret = 500;
snac_debug(snac, 2, xs_fmt("following_add %s %s", actor, fn));
return ret;
}
int following_del(snac *snac, char *actor)
/* we're not following this actor any longer */
{
xs *fn = _following_fn(snac, actor);
unlink(fn);
snac_debug(snac, 2, xs_fmt("following_del %s %s", actor, fn));
return 200;
}
int following_check(snac *snac, char *actor)
/* checks if we are following this actor */
{
xs *fn = _following_fn(snac, actor);
return !!(mtime(fn) != 0.0);
}
int following_get(snac *snac, char *actor, d_char **data)
/* returns the 'Follow' object */
{
xs *fn = _following_fn(snac, actor);
FILE *f;
int status = 200;
if ((f = fopen(fn, "r")) != NULL) {
xs *j = xs_readall(f);
fclose(f);
*data = xs_json_loads(j);
}
else
status = 404;
return status;
}
d_char *following_list(snac *snac)
/* returns the list of people being followed */
{
xs *spec = xs_fmt("%s/following/" "*.json", snac->basedir);
xs *glist = xs_glob(spec, 0, 0);
char *p, *v;
d_char *list = xs_list_new();
/* iterate the list of files */
p = glist;
while (xs_list_iter(&p, &v)) {
FILE *f;
/* load the follower data */
if ((f = fopen(v, "r")) != NULL) {
xs *j = xs_readall(f);
fclose(f);
if (j != NULL) {
xs *o = xs_json_loads(j);
if (o != NULL) {
char *type = xs_dict_get(o, "type");
if (!xs_is_null(type) && strcmp(type, "Accept") == 0) {
char *actor = xs_dict_get(o, "actor");
if (!xs_is_null(actor))
list = xs_list_append(list, actor);
}
}
}
}
}
return list;
}
d_char *_muted_fn(snac *snac, char *actor)
{
xs *md5 = xs_md5_hex(actor, strlen(actor));
return xs_fmt("%s/muted/%s", snac->basedir, md5);
}
void mute(snac *snac, char *actor)
/* mutes a moron */
{
xs *fn = _muted_fn(snac, actor);
FILE *f;
if ((f = fopen(fn, "w")) != NULL) {
fprintf(f, "%s\n", actor);
fclose(f);
snac_debug(snac, 2, xs_fmt("muted %s %s", actor, fn));
}
}
void unmute(snac *snac, char *actor)
/* actor is no longer a moron */
{
xs *fn = _muted_fn(snac, actor);
unlink(fn);
snac_debug(snac, 2, xs_fmt("unmuted %s %s", actor, fn));
}
int is_muted(snac *snac, char *actor)
/* check if someone is muted */
{
xs *fn = _muted_fn(snac, actor);
return !!(mtime(fn) != 0.0);
}
d_char *_hidden_fn(snac *snac, const char *id)
{
xs *md5 = xs_md5_hex(id, strlen(id));
return xs_fmt("%s/hidden/%s", snac->basedir, md5);
}
void hide(snac *snac, const char *id)
/* hides a message tree */
{
xs *fn = _hidden_fn(snac, id);
FILE *f;
if ((f = fopen(fn, "w")) != NULL) {
fprintf(f, "%s\n", id);
fclose(f);
snac_debug(snac, 2, xs_fmt("hidden %s %s", id, fn));
/* hide all the children */
xs *chld = object_children(id);
char *p, *v;
p = chld;
while (xs_list_iter(&p, &v)) {
xs *co = NULL;
/* resolve to get the id */
if (valid_status(object_get_by_md5(v, &co))) {
if ((v = xs_dict_get(co, "id")) != NULL)
hide(snac, v);
}
}
}
}
int is_hidden(snac *snac, const char *id)
/* check is id is hidden */
{
xs *fn = _hidden_fn(snac, id);
return !!(mtime(fn) != 0.0);
}
int actor_add(snac *snac, const char *actor, d_char *msg)
/* adds an actor */
{
return object_add_ow(actor, msg);
}
int actor_get(snac *snac, const char *actor, d_char **data)
/* returns an already downloaded actor */
{
int status = 200;
d_char *d;
if (strcmp(actor, snac->actor) == 0) {
/* this actor */
if (data)
*data = msg_actor(snac);
return status;
}
/* read the object */
if (!valid_status(status = object_get(actor, &d)))
return status;
if (data)
*data = d;
else
d = xs_free(d);
xs *fn = _object_fn(actor);
double max_time;
/* maximum time for the actor data to be considered stale */
max_time = 3600.0 * 36.0;
if (mtime(fn) + max_time < (double) time(NULL)) {
/* actor data exists but also stinks */
FILE *f;
if ((f = fopen(fn, "a")) != NULL) {
/* write a blank at the end to 'touch' the file */
fwrite(" ", 1, 1, f);
fclose(f);
}
status = 205; /* "205: Reset Content" "110: Response Is Stale" */
}
return status;
}
d_char *_static_fn(snac *snac, const char *id)
/* gets the filename for a static file */
{
return xs_fmt("%s/static/%s", snac->basedir, id);
}
int static_get(snac *snac, const char *id, d_char **data, int *size)
/* returns static content */
{
xs *fn = _static_fn(snac, id);
FILE *f;
int status = 404;
*size = XS_ALL;
if ((f = fopen(fn, "rb")) != NULL) {
*data = xs_read(f, size);
fclose(f);
status = 200;
}
return status;
}
void static_put(snac *snac, const char *id, const char *data, int size)
/* writes status content */
{
xs *fn = _static_fn(snac, id);
FILE *f;
if ((f = fopen(fn, "wb")) != NULL) {
fwrite(data, size, 1, f);
fclose(f);
}
}
d_char *_history_fn(snac *snac, char *id)
/* gets the filename for the history */
{
return xs_fmt("%s/history/%s", snac->basedir, id);
}
double history_mtime(snac *snac, char * id)
{
double t = 0.0;
xs *fn = _history_fn(snac, id);
if (fn != NULL)
t = mtime(fn);
return t;
}
void history_add(snac *snac, char *id, char *content, int size)
/* adds something to the history */
{
xs *fn = _history_fn(snac, id);
FILE *f;
if ((f = fopen(fn, "w")) != NULL) {
fwrite(content, size, 1, f);
fclose(f);
}
}
d_char *history_get(snac *snac, char *id)
{
d_char *content = NULL;
xs *fn = _history_fn(snac, id);
FILE *f;
if ((f = fopen(fn, "r")) != NULL) {
content = xs_readall(f);
fclose(f);
}
return content;
}
int history_del(snac *snac, char *id)
{
xs *fn = _history_fn(snac, id);
return unlink(fn);
}
d_char *history_list(snac *snac)
{
xs *spec = xs_fmt("%s/history/" "*.html", snac->basedir);
return xs_glob(spec, 1, 0);
}
/** inbox collection **/
void inbox_add(const char *inbox)
/* collects a shared inbox */
{
xs *md5 = xs_md5_hex(inbox, strlen(inbox));
xs *fn = xs_fmt("%s/inbox/%s", srv_basedir, md5);
FILE *f;
if (strlen(inbox) < 256 && (f = fopen(fn, "w")) != NULL) {
pthread_mutex_lock(&data_mutex);
fprintf(f, "%s\n", inbox);
fclose(f);
pthread_mutex_unlock(&data_mutex);
}
}
void inbox_add_by_actor(const xs_dict *actor)
/* collects an actor's shared inbox, if it has one */
{
char *v;
if (!xs_is_null(v = xs_dict_get(actor, "endpoints")) &&
!xs_is_null(v = xs_dict_get(v, "sharedInbox")))
inbox_add(v);
}
xs_list *inbox_list(void)
/* returns the collected inboxes as a list */
{
xs_list *ibl = xs_list_new();
xs *spec = xs_fmt("%s/inbox/" "*", srv_basedir);
xs *files = xs_glob(spec, 0, 0);
xs_list *p = files;
xs_val *v;
while (xs_list_iter(&p, &v)) {
FILE *f;
if ((f = fopen(v, "r")) != NULL) {
char line[256];
if (fgets(line, sizeof(line), f)) {
fclose(f);
int i = strlen(line);
if (i) {
line[i - 1] = '\0';
ibl = xs_list_append(ibl, line);
}
}
}
}
return ibl;
}
/** the queue **/
static xs_dict *_enqueue_put(const char *fn, xs_dict *msg)
/* writes safely to the queue */
{
xs *tfn = xs_fmt("%s.tmp", fn);
FILE *f;
if ((f = fopen(tfn, "w")) != NULL) {
xs *j = xs_json_dumps_pp(msg, 4);
fwrite(j, strlen(j), 1, f);
fclose(f);
rename(tfn, fn);
}
return msg;
}
static xs_dict *_new_qmsg(const char *type, const xs_val *msg, int retries)
/* creates a queue message */
{
int qrt = xs_number_get(xs_dict_get(srv_config, "queue_retry_minutes"));
xs *ntid = tid(retries * 60 * qrt);
xs *rn = xs_number_new(retries);
xs_dict *qmsg = xs_dict_new();
qmsg = xs_dict_append(qmsg, "type", type);
qmsg = xs_dict_append(qmsg, "message", msg);
qmsg = xs_dict_append(qmsg, "retries", rn);
qmsg = xs_dict_append(qmsg, "ntid", ntid);
return qmsg;
}
void enqueue_input(snac *snac, xs_dict *msg, xs_dict *req, int retries)
/* enqueues an input message */
{
xs *qmsg = _new_qmsg("input", msg, retries);
char *ntid = xs_dict_get(qmsg, "ntid");
xs *fn = xs_fmt("%s/queue/%s.json", snac->basedir, ntid);
qmsg = xs_dict_append(qmsg, "req", req);
qmsg = _enqueue_put(fn, qmsg);
snac_debug(snac, 1, xs_fmt("enqueue_input %s", fn));
}
void enqueue_output_raw(const char *keyid, const char *seckey,
xs_dict *msg, xs_str *inbox, int retries)
/* enqueues an output message to an inbox */
{
xs *qmsg = _new_qmsg("output", msg, retries);
char *ntid = xs_dict_get(qmsg, "ntid");
xs *fn = xs_fmt("%s/queue/%s.json", srv_basedir, ntid);
qmsg = xs_dict_append(qmsg, "inbox", inbox);
qmsg = xs_dict_append(qmsg, "keyid", keyid);
qmsg = xs_dict_append(qmsg, "seckey", seckey);
/* if it's to be sent right now, bypass the disk queue and post the job */
if (retries == 0 && job_fifo_ready())
job_post(qmsg);
else {
qmsg = _enqueue_put(fn, qmsg);
srv_debug(1, xs_fmt("enqueue_output %s %s %d", inbox, fn, retries));
}
}
void enqueue_output(snac *snac, xs_dict *msg, xs_str *inbox, int retries)
/* enqueues an output message to an inbox */
{
if (xs_startswith(inbox, snac->actor)) {
snac_debug(snac, 1, xs_str_new("refusing enqueue to myself"));
return;
}
char *seckey = xs_dict_get(snac->key, "secret");
enqueue_output_raw(snac->actor, seckey, msg, inbox, retries);
}
void enqueue_output_by_actor(snac *snac, xs_dict *msg, xs_str *actor, int retries)
/* enqueues an output message for an actor */
{
xs *inbox = get_actor_inbox(snac, actor);
if (!xs_is_null(inbox))
enqueue_output(snac, msg, inbox, retries);
else
snac_log(snac, xs_fmt("enqueue_output_by_actor cannot get inbox %s", actor));
}
void enqueue_email(xs_str *msg, int retries)
/* enqueues an email message to be sent */
{
xs *qmsg = _new_qmsg("email", msg, retries);
char *ntid = xs_dict_get(qmsg, "ntid");
xs *fn = xs_fmt("%s/queue/%s.json", srv_basedir, ntid);
qmsg = _enqueue_put(fn, qmsg);
srv_debug(1, xs_fmt("enqueue_email %d", retries));
}
void enqueue_telegram(const xs_str *msg, const char *bot, const char *chat_id)
/* enqueues a message to be sent via Telegram */
{
xs *qmsg = _new_qmsg("telegram", msg, 0);
char *ntid = xs_dict_get(qmsg, "ntid");
xs *fn = xs_fmt("%s/queue/%s.json", srv_basedir, ntid);
qmsg = xs_dict_append(qmsg, "bot", bot);
qmsg = xs_dict_append(qmsg, "chat_id", chat_id);
qmsg = _enqueue_put(fn, qmsg);
srv_debug(1, xs_fmt("enqueue_email %s %s", bot, chat_id));
}
void enqueue_message(snac *snac, xs_dict *msg)
/* enqueues an output message */
{
xs *qmsg = _new_qmsg("message", msg, 0);
char *ntid = xs_dict_get(qmsg, "ntid");
xs *fn = xs_fmt("%s/queue/%s.json", snac->basedir, ntid);
qmsg = _enqueue_put(fn, qmsg);
snac_debug(snac, 0, xs_fmt("enqueue_message %s", xs_dict_get(msg, "id")));
}
xs_list *user_queue(snac *snac)
/* returns a list with filenames that can be dequeued */
{
xs *spec = xs_fmt("%s/queue/" "*.json", snac->basedir);
xs_list *list = xs_list_new();
time_t t = time(NULL);
xs_list *p;
xs_val *v;
xs *fns = xs_glob(spec, 0, 0);
p = fns;
while (xs_list_iter(&p, &v)) {
/* get the retry time from the basename */
char *bn = strrchr(v, '/');
time_t t2 = atol(bn + 1);
if (t2 > t)
snac_debug(snac, 2, xs_fmt("user_queue not yet time for %s [%ld]", v, t));
else {
list = xs_list_append(list, v);
snac_debug(snac, 2, xs_fmt("user_queue ready for %s", v));
}
}
return list;
}
xs_list *queue(void)
/* returns a list with filenames that can be dequeued */
{
xs *spec = xs_fmt("%s/queue/" "*.json", srv_basedir);
xs_list *list = xs_list_new();
time_t t = time(NULL);
xs_list *p;
xs_val *v;
xs *fns = xs_glob(spec, 0, 0);
p = fns;
while (xs_list_iter(&p, &v)) {
/* get the retry time from the basename */
char *bn = strrchr(v, '/');
time_t t2 = atol(bn + 1);
if (t2 > t)
srv_debug(2, xs_fmt("queue not yet time for %s [%ld]", v, t));
else {
list = xs_list_append(list, v);
srv_debug(2, xs_fmt("queue ready for %s", v));
}
}
return list;
}
xs_dict *dequeue(const char *fn)
/* dequeues a message */
{
FILE *f;
xs_dict *obj = NULL;
if ((f = fopen(fn, "r")) != NULL) {
/* delete right now */
unlink(fn);
xs *j = xs_readall(f);
obj = xs_json_loads(j);
fclose(f);
}
return obj;
}
/** the purge **/
static int _purge_file(const char *fn, time_t mt)
/* purge fn if it's older than days */
{
int ret = 0;
if (mtime(fn) < mt) {
/* older than the minimum time: delete it */
unlink(fn);
srv_debug(1, xs_fmt("purged %s", fn));
ret = 1;
}
return ret;
}
static void _purge_subdir(snac *snac, const char *subdir, int days)
/* purges all files in subdir older than days */
{
int cnt = 0;
if (days) {
time_t mt = time(NULL) - days * 24 * 3600;
xs *spec = xs_fmt("%s/%s/" "*", snac->basedir, subdir);
xs *list = xs_glob(spec, 0, 0);
char *p, *v;
p = list;
while (xs_list_iter(&p, &v))
cnt += _purge_file(v, mt);
}
snac_debug(snac, 1, xs_fmt("purge: ~/%s/ %d", subdir, cnt));
}
void purge_server(void)
/* purge global server data */
{
xs *spec = xs_fmt("%s/object/??", srv_basedir);
xs *dirs = xs_glob(spec, 0, 0);
xs_list *p;
xs_str *v;
int cnt = 0;
int icnt = 0;
time_t mt = time(NULL) - 7 * 24 * 3600;
p = dirs;
while (xs_list_iter(&p, &v)) {
xs_list *p2;
xs_str *v2;
{
xs *spec2 = xs_fmt("%s/" "*.json", v);
xs *files = xs_glob(spec2, 0, 0);
p2 = files;
while (xs_list_iter(&p2, &v2)) {
int n_link;
/* old and with no hard links? */
if (mtime_nl(v2, &n_link) < mt && n_link < 2) {
xs *s1 = xs_replace(v2, ".json", "");
xs *l = xs_split(s1, "/");
char *md5 = xs_list_get(l, -1);
object_del_by_md5(md5);
cnt++;
}
}
}
{
/* look for stray indexes */
xs *speci = xs_fmt("%s/" "*_?.idx", v);
xs *idxfs = xs_glob(speci, 0, 0);
p2 = idxfs;
while (xs_list_iter(&p2, &v2)) {
/* old enough to consider? */
if (mtime(v2) < mt) {
/* check if the indexed object is here */
xs *o = xs_dup(v2);
char *ext = strchr(o, '_');
if (ext) {
*ext = '\0';
o = xs_str_cat(o, ".json");
if (mtime(o) == 0.0) {
/* delete */
unlink(v2);
srv_debug(1, xs_fmt("purged %s", v2));
icnt++;
}
}
}
}
}
}
srv_debug(1, xs_fmt("purge: global (obj: %d, idx: %d)", cnt, icnt));
}
void purge_user(snac *snac)
/* do the purge for this user */
{
int priv_days, pub_days, user_days = 0;
char *v;
int n;
priv_days = xs_number_get(xs_dict_get(srv_config, "timeline_purge_days"));
pub_days = xs_number_get(xs_dict_get(srv_config, "local_purge_days"));
if ((v = xs_dict_get(snac->config_o, "purge_days")) != NULL ||
(v = xs_dict_get(snac->config, "purge_days")) != NULL)
user_days = xs_number_get(v);
if (user_days) {
/* override admin settings only if they are lesser */
if (priv_days == 0 || user_days < priv_days)
priv_days = user_days;
if (pub_days == 0 || user_days < pub_days)
pub_days = user_days;
}
_purge_subdir(snac, "hidden", priv_days);
_purge_subdir(snac, "private", priv_days);
_purge_subdir(snac, "public", pub_days);
const char *idxs[] = { "followers.idx", "private.idx", "public.idx", NULL };
for (n = 0; idxs[n]; n++) {
xs *idx = xs_fmt("%s/%s", snac->basedir, idxs[n]);
int gc = index_gc(idx);
snac_debug(snac, 1, xs_fmt("purge: %s %d", idx, gc));
}
}
void purge_all(void)
/* purge all users */
{
snac snac;
xs *list = user_list();
char *p, *uid;
p = list;
while (xs_list_iter(&p, &uid)) {
if (user_open(&snac, uid)) {
purge_user(&snac);
user_free(&snac);
}
}
purge_server();
}
/** archive **/
void srv_archive(const char *direction, xs_dict *req,
const char *payload, int p_size,
int status, xs_dict *headers,
const char *body, int b_size)
/* archives a connection */
{
/* obsessive archiving */
xs *date = tid(0);
xs *dir = xs_fmt("%s/archive/%s_%s", srv_basedir, date, direction);
FILE *f;
if (mkdirx(dir) != -1) {
xs *meta_fn = xs_fmt("%s/_META", dir);
if ((f = fopen(meta_fn, "w")) != NULL) {
xs *j1 = xs_json_dumps_pp(req, 4);
xs *j2 = xs_json_dumps_pp(headers, 4);
fprintf(f, "dir: %s\n", direction);
fprintf(f, "req: %s\n", j1);
fprintf(f, "p_size: %d\n", p_size);
fprintf(f, "status: %d\n", status);
fprintf(f, "response: %s\n", j2);
fprintf(f, "b_size: %d\n", b_size);
fclose(f);
}
if (p_size && payload) {
xs *payload_fn = NULL;
xs *payload_fn_raw = NULL;
char *v = xs_dict_get(req, "content-type");
if (v && xs_str_in(v, "json") != -1) {
payload_fn = xs_fmt("%s/payload.json", dir);
if ((f = fopen(payload_fn, "w")) != NULL) {
xs *v1 = xs_json_loads(payload);
xs *j1 = NULL;
if (v1 != NULL)
j1 = xs_json_dumps_pp(v1, 4);
if (j1 != NULL)
fwrite(j1, strlen(j1), 1, f);
else
fwrite(payload, p_size, 1, f);
fclose(f);
}
}
payload_fn_raw = xs_fmt("%s/payload", dir);
if ((f = fopen(payload_fn_raw, "w")) != NULL) {
fwrite(payload, p_size, 1, f);
fclose(f);
}
}
if (b_size && body) {
xs *body_fn = NULL;
char *v = xs_dict_get(headers, "content-type");
if (v && xs_str_in(v, "json") != -1) {
body_fn = xs_fmt("%s/body.json", dir);
if ((f = fopen(body_fn, "w")) != NULL) {
xs *v1 = xs_json_loads(body);
xs *j1 = NULL;
if (v1 != NULL)
j1 = xs_json_dumps_pp(v1, 4);
if (j1 != NULL)
fwrite(j1, strlen(j1), 1, f);
else
fwrite(body, b_size, 1, f);
fclose(f);
}
}
else {
body_fn = xs_fmt("%s/body", dir);
if ((f = fopen(body_fn, "w")) != NULL) {
fwrite(body, b_size, 1, f);
fclose(f);
}
}
}
}
}
void srv_archive_error(const char *prefix, const xs_str *err,
const xs_dict *req, const xs_dict *data)
/* archives an error */
{
xs *ntid = tid(0);
xs *fn = xs_fmt("%s/error/%s_%s", srv_basedir, prefix, ntid);
FILE *f;
if ((f = fopen(fn, "w")) != NULL) {
fprintf(f, "Error: %s\n", err);
if (req) {
fprintf(f, "Request headers:\n");
xs *j = xs_json_dumps_pp(req, 4);
fwrite(j, strlen(j), 1, f);
}
if (data) {
fprintf(f, "Data:\n");
xs *j = xs_json_dumps_pp(data, 4);
fwrite(j, strlen(j), 1, f);
}
fclose(f);
}
}