mirror of
https://codeberg.org/grunfink/snac2.git
synced 2024-11-09 11:40:27 +03:00
409 lines
12 KiB
C
409 lines
12 KiB
C
/* snac - A simple, minimalistic ActivityPub instance */
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/* copyright (c) 2022 - 2024 grunfink et al. / MIT license */
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#include "xs.h"
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#include "xs_regex.h"
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#include "xs_mime.h"
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#include "xs_html.h"
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#include "xs_json.h"
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#include "xs_time.h"
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#include "snac.h"
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/* emoticons, people laughing and such */
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const char *smileys[] = {
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":-)", "🙂",
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":-D", "😀",
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"X-D", "😆",
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";-)", "😉",
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"B-)", "😎",
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">:-(", "😡",
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":-(", "😞",
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":-*", "😘",
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":-/", "😕",
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"8-o", "😲",
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"%-)", "🤪",
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":_(", "😢",
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":-|", "😐",
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"<3", "❤️",
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":facepalm:", "🤦",
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":shrug:", "🤷",
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":shrug2:", "¯\\_(ツ)_/¯",
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":eyeroll:", "🙄",
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":beer:", "🍺",
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":beers:", "🍻",
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":munch:", "😱",
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":thumb:", "👍",
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NULL, NULL
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};
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xs_dict *emojis(void)
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/* returns a dict with the emojis */
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{
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xs *fn = xs_fmt("%s/emojis.json", srv_basedir);
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FILE *f;
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if (mtime(fn) == 0) {
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/* file does not exist; create it with the defaults */
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xs *d = xs_dict_new();
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const char **emo = smileys;
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while (*emo) {
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d = xs_dict_append(d, emo[0], emo[1]);
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emo += 2;
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}
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if ((f = fopen(fn, "w")) != NULL) {
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xs_json_dump(d, 4, f);
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fclose(f);
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}
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else
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srv_log(xs_fmt("Error creating '%s'", fn));
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}
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xs_dict *d = NULL;
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if ((f = fopen(fn, "r")) != NULL) {
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d = xs_json_load(f);
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fclose(f);
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if (d == NULL)
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srv_log(xs_fmt("JSON parse error in '%s'", fn));
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}
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else
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srv_log(xs_fmt("Error opening '%s'", fn));
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return d;
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}
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static xs_str *format_line(const char *line, xs_list **attach)
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/* formats a line */
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{
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xs_str *s = xs_str_new(NULL);
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char *p;
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const char *v;
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/* split by markup */
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xs *sm = xs_regex_split(line,
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"("
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"`[^`]+`" "|"
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"~~[^~]+~~" "|"
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"\\*\\*?\\*?[^\\*]+\\*?\\*?\\*" "|"
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"!\\[[^]]+\\]\\([^\\)]+\\)" "|"
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"\\[[^]]+\\]\\([^\\)]+\\)" "|"
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"https?:/" "/[^[:space:]]+"
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")");
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int n = 0;
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p = sm;
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while (xs_list_iter(&p, &v)) {
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if ((n & 0x1)) {
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/* markup */
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if (xs_startswith(v, "`")) {
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xs *s1 = xs_strip_chars_i(xs_dup(v), "`");
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xs *e1 = encode_html(s1);
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xs *s2 = xs_fmt("<code>%s</code>", e1);
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s = xs_str_cat(s, s2);
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}
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else
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if (xs_startswith(v, "***")) {
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xs *s1 = xs_strip_chars_i(xs_dup(v), "*");
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xs *s2 = xs_fmt("<b><i>%s</i></b>", s1);
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s = xs_str_cat(s, s2);
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}
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else
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if (xs_startswith(v, "**")) {
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xs *s1 = xs_strip_chars_i(xs_dup(v), "*");
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xs *s2 = xs_fmt("<b>%s</b>", s1);
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s = xs_str_cat(s, s2);
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}
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else
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if (xs_startswith(v, "*")) {
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xs *s1 = xs_strip_chars_i(xs_dup(v), "*");
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xs *s2 = xs_fmt("<i>%s</i>", s1);
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s = xs_str_cat(s, s2);
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}
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else
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if (xs_startswith(v, "~~")) {
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xs *s1 = xs_strip_chars_i(xs_dup(v), "~");
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xs *e1 = encode_html(s1);
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xs *s2 = xs_fmt("<s>%s</s>", e1);
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s = xs_str_cat(s, s2);
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}
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else
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if (xs_startswith(v, "http")) {
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xs *u = xs_replace(v, "#", "#");
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xs *v2 = xs_strip_chars_i(xs_dup(u), ".,)");
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const char *mime = xs_mime_by_ext(v2);
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if (attach != NULL && xs_startswith(mime, "image/")) {
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/* if it's a link to an image, insert it as an attachment */
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xs *d = xs_dict_new();
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d = xs_dict_append(d, "mediaType", mime);
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d = xs_dict_append(d, "url", v2);
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d = xs_dict_append(d, "name", "");
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d = xs_dict_append(d, "type", "Image");
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*attach = xs_list_append(*attach, d);
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}
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else {
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xs *s1 = xs_fmt("<a href=\"%s\" target=\"_blank\">%s</a>", v2, u);
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s = xs_str_cat(s, s1);
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}
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}
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else
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if (*v == '[') {
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/* markdown-like links [label](url) */
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xs *w = xs_strip_chars_i(xs_replace(v, "#", "#"), "[)");
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xs *l = xs_split_n(w, "](", 1);
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if (xs_list_len(l) == 2) {
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xs *link = xs_fmt("<a href=\"%s\">%s</a>",
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xs_list_get(l, 1), xs_list_get(l, 0));
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s = xs_str_cat(s, link);
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}
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else
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s = xs_str_cat(s, v);
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}
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else
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if (*v == '!') {
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/* markdown-like images  */
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xs *w = xs_strip_chars_i(xs_replace(v, "#", "#"), "![)");
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xs *l = xs_split_n(w, "](", 1);
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if (xs_list_len(l) == 2) {
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const char *alt_text = xs_list_get(l, 0);
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const char *img_url = xs_list_get(l, 1);
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const char *mime = xs_mime_by_ext(img_url);
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if (attach != NULL && xs_startswith(mime, "image/")) {
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xs *d = xs_dict_new();
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d = xs_dict_append(d, "mediaType", mime);
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d = xs_dict_append(d, "url", img_url);
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d = xs_dict_append(d, "name", alt_text);
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d = xs_dict_append(d, "type", "Image");
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*attach = xs_list_append(*attach, d);
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}
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else {
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xs *link = xs_fmt("<a href=\"%s\">%s</a>", img_url, alt_text);
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s = xs_str_cat(s, link);
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}
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}
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else
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s = xs_str_cat(s, v);
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}
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else
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s = xs_str_cat(s, v);
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}
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else
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/* surrounded text, copy directly */
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s = xs_str_cat(s, v);
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n++;
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}
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return s;
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}
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xs_str *not_really_markdown(const char *content, xs_list **attach, xs_list **tag)
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/* formats a content using some Markdown rules */
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{
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xs_str *s = xs_str_new(NULL);
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int in_pre = 0;
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int in_blq = 0;
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xs *list;
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char *p;
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const char *v;
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/* work by lines */
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list = xs_split(content, "\n");
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p = list;
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while (xs_list_iter(&p, &v)) {
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xs *ss = NULL;
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if (strcmp(v, "```") == 0) {
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if (!in_pre)
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s = xs_str_cat(s, "<pre>");
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else
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s = xs_str_cat(s, "</pre>");
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in_pre = !in_pre;
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continue;
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}
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if (in_pre) {
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// Encode all HTML characters when we're in pre element until we are out.
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ss = encode_html(v);
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s = xs_str_cat(s, ss);
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s = xs_str_cat(s, "<br>");
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continue;
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}
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else
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ss = xs_strip_i(format_line(v, attach));
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if (xs_startswith(ss, "---")) {
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/* delete the --- */
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ss = xs_strip_i(xs_crop_i(ss, 3, 0));
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s = xs_str_cat(s, "<hr>");
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s = xs_str_cat(s, ss);
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continue;
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}
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if (xs_startswith(ss, ">")) {
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/* delete the > and subsequent spaces */
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ss = xs_strip_i(xs_crop_i(ss, 1, 0));
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if (!in_blq) {
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s = xs_str_cat(s, "<blockquote>");
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in_blq = 1;
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}
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s = xs_str_cat(s, ss);
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s = xs_str_cat(s, "<br>");
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continue;
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}
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if (in_blq) {
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s = xs_str_cat(s, "</blockquote>");
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in_blq = 0;
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}
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s = xs_str_cat(s, ss);
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s = xs_str_cat(s, "<br>");
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}
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if (in_blq)
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s = xs_str_cat(s, "</blockquote>");
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if (in_pre)
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s = xs_str_cat(s, "</pre>");
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/* some beauty fixes */
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s = xs_replace_i(s, "<br><br><blockquote>", "<br><blockquote>");
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s = xs_replace_i(s, "</blockquote><br>", "</blockquote>");
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s = xs_replace_i(s, "</pre><br>", "</pre>");
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{
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/* traditional emoticons */
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xs *d = emojis();
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int c = 0;
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const char *k, *v;
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while (xs_dict_next(d, &k, &v, &c)) {
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const char *t = NULL;
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/* is it an URL to an image? */
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if (xs_startswith(v, "https:/" "/") && xs_startswith((t = xs_mime_by_ext(v)), "image/")) {
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if (tag && xs_str_in(s, k) != -1) {
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/* add the emoji to the tag list */
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xs *e = xs_dict_new();
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xs *i = xs_dict_new();
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xs *u = xs_str_utctime(0, ISO_DATE_SPEC);
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e = xs_dict_append(e, "id", v);
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e = xs_dict_append(e, "type", "Emoji");
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e = xs_dict_append(e, "name", k);
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e = xs_dict_append(e, "updated", u);
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i = xs_dict_append(i, "type", "Image");
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i = xs_dict_append(i, "mediaType", t);
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i = xs_dict_append(i, "url", v);
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e = xs_dict_append(e, "icon", i);
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*tag = xs_list_append(*tag, e);
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}
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}
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else
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s = xs_replace_i(s, k, v);
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}
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}
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return s;
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}
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const char *valid_tags[] = {
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"a", "p", "br", "br/", "blockquote", "ul", "ol", "li", "cite", "small",
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"span", "i", "b", "u", "s", "pre", "code", "em", "strong", "hr", "img", "del", "bdi", NULL
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};
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xs_str *sanitize(const char *content)
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/* cleans dangerous HTML output */
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{
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xs_str *s = xs_str_new(NULL);
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xs *sl;
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int n = 0;
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char *p;
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const char *v;
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sl = xs_regex_split(content, "</?[^>]+>");
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p = sl;
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n = 0;
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while (xs_list_iter(&p, &v)) {
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if (n & 0x1) {
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xs *s1 = xs_strip_i(xs_crop_i(xs_dup(v), v[1] == '/' ? 2 : 1, -1));
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xs *l1 = xs_split_n(s1, " ", 1);
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xs *tag = xs_tolower_i(xs_dup(xs_list_get(l1, 0)));
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xs *s2 = NULL;
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int i;
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/* check if it's one of the valid tags */
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for (i = 0; valid_tags[i]; i++) {
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if (strcmp(tag, valid_tags[i]) == 0)
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break;
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}
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if (valid_tags[i]) {
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/* accepted tag: rebuild it with only the accepted elements */
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xs *el = xs_regex_select(v, "(src|href|rel|class|target)=\"[^\"]*\"");
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xs *s3 = xs_join(el, " ");
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s2 = xs_fmt("<%s%s%s%s>",
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v[1] == '/' ? "/" : "", tag, xs_list_len(el) ? " " : "", s3);
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s = xs_str_cat(s, s2);
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} else {
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/* treat end of divs as paragraph breaks */
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if (strcmp(v, "</div>"))
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s = xs_str_cat(s, "<p>");
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}
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}
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else {
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/* non-tag */
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s = xs_str_cat(s, v);
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}
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n++;
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}
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return s;
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}
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xs_str *encode_html(const char *str)
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/* escapes html characters */
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{
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xs_str *encoded = xs_html_encode((char *)str);
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/* Restore only <br>. Probably safe. Let's hope nothing goes wrong with this. */
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encoded = xs_replace_i(encoded, "<br>", "<br>");
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return encoded;
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}
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