mirror of
https://codeberg.org/grunfink/snac2.git
synced 2024-12-25 16:53:37 +00:00
437 lines
13 KiB
C
437 lines
13 KiB
C
/* snac - A simple, minimalistic ActivityPub instance */
|
|
/* copyright (c) 2022 - 2024 grunfink et al. / MIT license */
|
|
|
|
#include "xs.h"
|
|
#include "xs_regex.h"
|
|
#include "xs_mime.h"
|
|
#include "xs_html.h"
|
|
#include "xs_json.h"
|
|
#include "xs_time.h"
|
|
|
|
#include "snac.h"
|
|
|
|
/* emoticons, people laughing and such */
|
|
const char *smileys[] = {
|
|
":-)", "🙂",
|
|
":-D", "😀",
|
|
"X-D", "😆",
|
|
";-)", "😉",
|
|
"B-)", "😎",
|
|
">:-(", "😡",
|
|
":-(", "😞",
|
|
":-*", "😘",
|
|
":-/", "😕",
|
|
"8-o", "😲",
|
|
"%-)", "🤪",
|
|
":_(", "😢",
|
|
":-|", "😐",
|
|
"<3", "❤️",
|
|
":facepalm:", "🤦",
|
|
":shrug:", "🤷",
|
|
":shrug2:", "¯\\_(ツ)_/¯",
|
|
":eyeroll:", "🙄",
|
|
":beer:", "🍺",
|
|
":beers:", "🍻",
|
|
":munch:", "😱",
|
|
":thumb:", "👍",
|
|
NULL, NULL
|
|
};
|
|
|
|
|
|
xs_dict *emojis(void)
|
|
/* returns a dict with the emojis */
|
|
{
|
|
xs *fn = xs_fmt("%s/emojis.json", srv_basedir);
|
|
FILE *f;
|
|
|
|
if (mtime(fn) == 0) {
|
|
/* file does not exist; create it with the defaults */
|
|
xs *d = xs_dict_new();
|
|
const char **emo = smileys;
|
|
|
|
while (*emo) {
|
|
d = xs_dict_append(d, emo[0], emo[1]);
|
|
emo += 2;
|
|
}
|
|
|
|
if ((f = fopen(fn, "w")) != NULL) {
|
|
xs_json_dump(d, 4, f);
|
|
fclose(f);
|
|
}
|
|
else
|
|
srv_log(xs_fmt("Error creating '%s'", fn));
|
|
}
|
|
|
|
xs_dict *d = NULL;
|
|
|
|
if ((f = fopen(fn, "r")) != NULL) {
|
|
d = xs_json_load(f);
|
|
fclose(f);
|
|
|
|
if (d == NULL)
|
|
srv_log(xs_fmt("JSON parse error in '%s'", fn));
|
|
}
|
|
else
|
|
srv_log(xs_fmt("Error opening '%s'", fn));
|
|
|
|
return d;
|
|
}
|
|
|
|
|
|
static xs_str *format_line(const char *line, xs_list **attach)
|
|
/* formats a line */
|
|
{
|
|
xs_str *s = xs_str_new(NULL);
|
|
char *p;
|
|
const char *v;
|
|
|
|
/* split by markup */
|
|
xs *sm = xs_regex_split(line,
|
|
"("
|
|
"`[^`]+`" "|"
|
|
"~~[^~]+~~" "|"
|
|
"\\*\\*?\\*?[^\\*]+\\*?\\*?\\*" "|"
|
|
"!\\[[^]]+\\]\\([^\\)]+\\)" "|"
|
|
"\\[[^]]+\\]\\([^\\)]+\\)" "|"
|
|
"[a-z]+:/" "/[^[:space:]]+"
|
|
")");
|
|
int n = 0;
|
|
|
|
p = sm;
|
|
while (xs_list_iter(&p, &v)) {
|
|
if ((n & 0x1)) {
|
|
/* markup */
|
|
if (xs_startswith(v, "`")) {
|
|
xs *s1 = xs_strip_chars_i(xs_dup(v), "`");
|
|
xs *e1 = encode_html(s1);
|
|
xs *s2 = xs_fmt("<code>%s</code>", e1);
|
|
s = xs_str_cat(s, s2);
|
|
}
|
|
else
|
|
if (xs_startswith(v, "***")) {
|
|
xs *s1 = xs_strip_chars_i(xs_dup(v), "*");
|
|
xs *s2 = xs_fmt("<b><i>%s</i></b>", s1);
|
|
s = xs_str_cat(s, s2);
|
|
}
|
|
else
|
|
if (xs_startswith(v, "**")) {
|
|
xs *s1 = xs_strip_chars_i(xs_dup(v), "*");
|
|
xs *s2 = xs_fmt("<b>%s</b>", s1);
|
|
s = xs_str_cat(s, s2);
|
|
}
|
|
else
|
|
if (xs_startswith(v, "*")) {
|
|
xs *s1 = xs_strip_chars_i(xs_dup(v), "*");
|
|
xs *s2 = xs_fmt("<i>%s</i>", s1);
|
|
s = xs_str_cat(s, s2);
|
|
}
|
|
else
|
|
if (xs_startswith(v, "~~")) {
|
|
xs *s1 = xs_strip_chars_i(xs_dup(v), "~");
|
|
xs *e1 = encode_html(s1);
|
|
xs *s2 = xs_fmt("<s>%s</s>", e1);
|
|
s = xs_str_cat(s, s2);
|
|
}
|
|
else
|
|
if (*v == '[') {
|
|
/* markdown-like links [label](url) */
|
|
xs *w = xs_strip_chars_i(
|
|
xs_replace_i(xs_replace(v, "#", "#"), "@", "@"),
|
|
"![)");
|
|
xs *l = xs_split_n(w, "](", 1);
|
|
|
|
if (xs_list_len(l) == 2) {
|
|
xs *link = xs_fmt("<a href=\"%s\">%s</a>",
|
|
xs_list_get(l, 1), xs_list_get(l, 0));
|
|
|
|
s = xs_str_cat(s, link);
|
|
}
|
|
else
|
|
s = xs_str_cat(s, v);
|
|
}
|
|
else
|
|
if (*v == '!') {
|
|
/* markdown-like images  */
|
|
xs *w = xs_strip_chars_i(
|
|
xs_replace_i(xs_replace(v, "#", "#"), "@", "@"),
|
|
"![)");
|
|
xs *l = xs_split_n(w, "](", 1);
|
|
|
|
if (xs_list_len(l) == 2) {
|
|
const char *alt_text = xs_list_get(l, 0);
|
|
const char *img_url = xs_list_get(l, 1);
|
|
const char *mime = xs_mime_by_ext(img_url);
|
|
|
|
if (attach != NULL && xs_startswith(mime, "image/")) {
|
|
const xs_dict *ad;
|
|
int add = 1;
|
|
|
|
xs_list_foreach(*attach, ad) {
|
|
if (strcmp(xs_dict_get_def(ad, "url", ""), img_url) == 0) {
|
|
add = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (add) {
|
|
xs *d = xs_dict_new();
|
|
|
|
d = xs_dict_append(d, "mediaType", mime);
|
|
d = xs_dict_append(d, "url", img_url);
|
|
d = xs_dict_append(d, "name", alt_text);
|
|
d = xs_dict_append(d, "type", "Image");
|
|
|
|
*attach = xs_list_append(*attach, d);
|
|
}
|
|
}
|
|
else {
|
|
xs *link = xs_fmt("<a href=\"%s\">%s</a>", img_url, alt_text);
|
|
|
|
s = xs_str_cat(s, link);
|
|
}
|
|
}
|
|
else
|
|
s = xs_str_cat(s, v);
|
|
}
|
|
else
|
|
if (xs_str_in(v, ":/" "/") != -1) {
|
|
xs *u = xs_replace_i(xs_replace(v, "#", "#"), "@", "@");
|
|
|
|
xs *v2 = xs_strip_chars_i(xs_dup(u), ".,)");
|
|
|
|
const char *mime = xs_mime_by_ext(v2);
|
|
|
|
if (attach != NULL && xs_startswith(mime, "image/")) {
|
|
/* if it's a link to an image, insert it as an attachment */
|
|
const xs_dict *ad;
|
|
int add = 1;
|
|
|
|
xs_list_foreach(*attach, ad) {
|
|
if (strcmp(xs_dict_get_def(ad, "url", ""), v2) == 0) {
|
|
add = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (add) {
|
|
xs *d = xs_dict_new();
|
|
|
|
d = xs_dict_append(d, "mediaType", mime);
|
|
d = xs_dict_append(d, "url", v2);
|
|
d = xs_dict_append(d, "name", "");
|
|
d = xs_dict_append(d, "type", "Image");
|
|
|
|
*attach = xs_list_append(*attach, d);
|
|
}
|
|
}
|
|
else {
|
|
xs *s1 = xs_fmt("<a href=\"%s\" target=\"_blank\">%s</a>", v2, u);
|
|
s = xs_str_cat(s, s1);
|
|
}
|
|
}
|
|
else
|
|
s = xs_str_cat(s, v);
|
|
}
|
|
else
|
|
/* surrounded text, copy directly */
|
|
s = xs_str_cat(s, v);
|
|
|
|
n++;
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
|
|
xs_str *not_really_markdown(const char *content, xs_list **attach, xs_list **tag)
|
|
/* formats a content using some Markdown rules */
|
|
{
|
|
xs_str *s = xs_str_new(NULL);
|
|
int in_pre = 0;
|
|
int in_blq = 0;
|
|
xs *list;
|
|
char *p;
|
|
const char *v;
|
|
|
|
/* work by lines */
|
|
list = xs_split(content, "\n");
|
|
|
|
p = list;
|
|
while (xs_list_iter(&p, &v)) {
|
|
xs *ss = NULL;
|
|
|
|
if (strcmp(v, "```") == 0) {
|
|
if (!in_pre)
|
|
s = xs_str_cat(s, "<pre>");
|
|
else
|
|
s = xs_str_cat(s, "</pre>");
|
|
|
|
in_pre = !in_pre;
|
|
continue;
|
|
}
|
|
|
|
if (in_pre) {
|
|
// Encode all HTML characters when we're in pre element until we are out.
|
|
ss = encode_html(v);
|
|
|
|
s = xs_str_cat(s, ss);
|
|
s = xs_str_cat(s, "<br>");
|
|
continue;
|
|
}
|
|
|
|
else
|
|
ss = xs_strip_i(format_line(v, attach));
|
|
|
|
if (xs_startswith(ss, "---")) {
|
|
/* delete the --- */
|
|
ss = xs_strip_i(xs_crop_i(ss, 3, 0));
|
|
s = xs_str_cat(s, "<hr>");
|
|
|
|
s = xs_str_cat(s, ss);
|
|
|
|
continue;
|
|
}
|
|
|
|
if (xs_startswith(ss, ">")) {
|
|
/* delete the > and subsequent spaces */
|
|
ss = xs_strip_i(xs_crop_i(ss, 1, 0));
|
|
|
|
if (!in_blq) {
|
|
s = xs_str_cat(s, "<blockquote>");
|
|
in_blq = 1;
|
|
}
|
|
|
|
s = xs_str_cat(s, ss);
|
|
s = xs_str_cat(s, "<br>");
|
|
|
|
continue;
|
|
}
|
|
|
|
if (in_blq) {
|
|
s = xs_str_cat(s, "</blockquote>");
|
|
in_blq = 0;
|
|
}
|
|
|
|
s = xs_str_cat(s, ss);
|
|
s = xs_str_cat(s, "<br>");
|
|
}
|
|
|
|
if (in_blq)
|
|
s = xs_str_cat(s, "</blockquote>");
|
|
if (in_pre)
|
|
s = xs_str_cat(s, "</pre>");
|
|
|
|
/* some beauty fixes */
|
|
s = xs_replace_i(s, "<br><br><blockquote>", "<br><blockquote>");
|
|
s = xs_replace_i(s, "</blockquote><br>", "</blockquote>");
|
|
s = xs_replace_i(s, "</pre><br>", "</pre>");
|
|
|
|
{
|
|
/* traditional emoticons */
|
|
xs *d = emojis();
|
|
int c = 0;
|
|
const char *k, *v;
|
|
|
|
while (xs_dict_next(d, &k, &v, &c)) {
|
|
const char *t = NULL;
|
|
|
|
/* is it an URL to an image? */
|
|
if (xs_startswith(v, "https:/" "/") && xs_startswith((t = xs_mime_by_ext(v)), "image/")) {
|
|
if (tag && xs_str_in(s, k) != -1) {
|
|
/* add the emoji to the tag list */
|
|
xs *e = xs_dict_new();
|
|
xs *i = xs_dict_new();
|
|
xs *u = xs_str_utctime(0, ISO_DATE_SPEC);
|
|
|
|
e = xs_dict_append(e, "id", v);
|
|
e = xs_dict_append(e, "type", "Emoji");
|
|
e = xs_dict_append(e, "name", k);
|
|
e = xs_dict_append(e, "updated", u);
|
|
|
|
i = xs_dict_append(i, "type", "Image");
|
|
i = xs_dict_append(i, "mediaType", t);
|
|
i = xs_dict_append(i, "url", v);
|
|
e = xs_dict_append(e, "icon", i);
|
|
|
|
*tag = xs_list_append(*tag, e);
|
|
}
|
|
}
|
|
else
|
|
s = xs_replace_i(s, k, v);
|
|
}
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
|
|
const char *valid_tags[] = {
|
|
"a", "p", "br", "br/", "blockquote", "ul", "ol", "li", "cite", "small",
|
|
"span", "i", "b", "u", "s", "pre", "code", "em", "strong", "hr", "img", "del", "bdi", NULL
|
|
};
|
|
|
|
xs_str *sanitize(const char *content)
|
|
/* cleans dangerous HTML output */
|
|
{
|
|
xs_str *s = xs_str_new(NULL);
|
|
xs *sl;
|
|
int n = 0;
|
|
char *p;
|
|
const char *v;
|
|
|
|
sl = xs_regex_split(content, "</?[^>]+>");
|
|
|
|
p = sl;
|
|
|
|
n = 0;
|
|
while (xs_list_iter(&p, &v)) {
|
|
if (n & 0x1) {
|
|
xs *s1 = xs_strip_i(xs_crop_i(xs_dup(v), v[1] == '/' ? 2 : 1, -1));
|
|
xs *l1 = xs_split_n(s1, " ", 1);
|
|
xs *tag = xs_tolower_i(xs_dup(xs_list_get(l1, 0)));
|
|
xs *s2 = NULL;
|
|
int i;
|
|
|
|
/* check if it's one of the valid tags */
|
|
for (i = 0; valid_tags[i]; i++) {
|
|
if (strcmp(tag, valid_tags[i]) == 0)
|
|
break;
|
|
}
|
|
|
|
if (valid_tags[i]) {
|
|
/* accepted tag: rebuild it with only the accepted elements */
|
|
xs *el = xs_regex_select(v, "(src|href|rel|class|target)=\"[^\"]*\"");
|
|
xs *s3 = xs_join(el, " ");
|
|
|
|
s2 = xs_fmt("<%s%s%s%s>",
|
|
v[1] == '/' ? "/" : "", tag, xs_list_len(el) ? " " : "", s3);
|
|
|
|
s = xs_str_cat(s, s2);
|
|
} else {
|
|
/* treat end of divs as paragraph breaks */
|
|
if (strcmp(v, "</div>"))
|
|
s = xs_str_cat(s, "<p>");
|
|
}
|
|
}
|
|
else {
|
|
/* non-tag */
|
|
s = xs_str_cat(s, v);
|
|
}
|
|
|
|
n++;
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
|
|
xs_str *encode_html(const char *str)
|
|
/* escapes html characters */
|
|
{
|
|
xs_str *encoded = xs_html_encode((char *)str);
|
|
|
|
/* Restore only <br>. Probably safe. Let's hope nothing goes wrong with this. */
|
|
encoded = xs_replace_i(encoded, "<br>", "<br>");
|
|
|
|
return encoded;
|
|
}
|