214 lines
9.7 KiB
Rust
214 lines
9.7 KiB
Rust
use heck::CamelCase;
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use openssl::rand::rand_bytes;
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use pulldown_cmark::{Event, Parser, Options, Tag, html};
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use rocket::{
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http::uri::Uri,
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response::{Redirect, Flash}
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};
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use std::borrow::Cow;
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use std::collections::HashSet;
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/// Generates an hexadecimal representation of 32 bytes of random data
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pub fn random_hex() -> String {
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let mut bytes = [0; 32];
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rand_bytes(&mut bytes).expect("Error while generating client id");
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bytes.iter().fold(String::new(), |res, byte| format!("{}{:x}", res, byte))
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}
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/// Remove non alphanumeric characters and CamelCase a string
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pub fn make_actor_id(name: &str) -> String {
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name.to_camel_case()
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.chars()
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.filter(|c| c.is_alphanumeric())
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.collect()
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}
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/**
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* Redirects to the login page with a given message.
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*
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* Note that the message should be translated before passed to this function.
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*/
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pub fn requires_login<T: Into<Uri<'static>>>(message: &str, url: T) -> Flash<Redirect> {
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Flash::new(Redirect::to(format!("/login?m={}", Uri::percent_encode(message))), "callback", url.into().to_string())
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}
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#[derive(Debug)]
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enum State {
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Mention,
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Hashtag,
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Word,
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Ready,
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}
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/// Returns (HTML, mentions, hashtags)
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pub fn md_to_html(md: &str, base_url: &str) -> (String, HashSet<String>, HashSet<String>) {
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let parser = Parser::new_ext(md, Options::all());
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let (parser, mentions, hashtags): (Vec<Event>, Vec<String>, Vec<String>) = parser
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.scan(None, |state: &mut Option<String>, evt|{
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let (s, res) = match evt {
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Event::Text(txt) => match state.take() {
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Some(mut prev_txt) => {
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prev_txt.push_str(&txt);
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(Some(prev_txt), vec![])
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},
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None => {
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(Some(txt.into_owned()), vec![])
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}
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},
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e => match state.take() {
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Some(prev) => (None, vec![Event::Text(Cow::Owned(prev)), e]),
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None => (None, vec![e]),
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}
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};
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*state = s;
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Some(res)
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})
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.flat_map(|v| v.into_iter())
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.map(|evt| match evt {
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Event::Text(txt) => {
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let (evts, _, _, _, new_mentions, new_hashtags) = txt.chars().fold((vec![], State::Ready, String::new(), 0, vec![], vec![]), |(mut events, state, mut text_acc, n, mut mentions, mut hashtags), c| {
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match state {
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State::Mention => {
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let char_matches = c.is_alphanumeric() || "@.-_".contains(c);
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if char_matches && (n < (txt.chars().count() - 1)) {
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text_acc.push(c);
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(events, State::Mention, text_acc, n + 1, mentions, hashtags)
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} else {
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if char_matches {
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text_acc.push(c)
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}
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let mention = text_acc;
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let short_mention = mention.splitn(1, '@').nth(0).unwrap_or("");
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let link = Tag::Link(format!("//{}/@/{}/", base_url, &mention).into(), short_mention.to_owned().into());
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mentions.push(mention.clone());
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events.push(Event::Start(link.clone()));
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events.push(Event::Text(format!("@{}", &short_mention).into()));
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events.push(Event::End(link));
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(events, State::Ready, c.to_string(), n + 1, mentions, hashtags)
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}
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}
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State::Hashtag => {
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let char_matches = c.is_alphanumeric() || "-_".contains(c);
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if char_matches && (n < (txt.chars().count() -1)) {
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text_acc.push(c);
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(events, State::Hashtag, text_acc, n+1, mentions, hashtags)
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} else {
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if char_matches {
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text_acc.push(c);
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}
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let hashtag = text_acc;
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let link = Tag::Link(format!("//{}/tag/{}", base_url, &hashtag.to_camel_case()).into(), hashtag.to_owned().into());
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hashtags.push(hashtag.clone());
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events.push(Event::Start(link.clone()));
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events.push(Event::Text(format!("#{}", &hashtag).into()));
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events.push(Event::End(link));
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(events, State::Ready, c.to_string(), n + 1, mentions, hashtags)
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}
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}
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State::Ready => {
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if c == '@' {
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events.push(Event::Text(text_acc.into()));
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(events, State::Mention, String::new(), n + 1, mentions, hashtags)
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} else if c == '#' {
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events.push(Event::Text(text_acc.into()));
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(events, State::Hashtag, String::new(), n + 1, mentions, hashtags)
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} else if c.is_alphanumeric() {
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text_acc.push(c);
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if n >= (txt.chars().count() - 1) { // Add the text after at the end, even if it is not followed by a mention.
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events.push(Event::Text(text_acc.clone().into()))
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}
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(events, State::Word, text_acc, n + 1, mentions, hashtags)
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} else {
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text_acc.push(c);
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if n >= (txt.chars().count() - 1) { // Add the text after at the end, even if it is not followed by a mention.
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events.push(Event::Text(text_acc.clone().into()))
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}
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(events, State::Ready, text_acc, n + 1, mentions, hashtags)
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}
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}
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State::Word => {
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text_acc.push(c);
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if c.is_alphanumeric() {
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if n >= (txt.chars().count() - 1) { // Add the text after at the end, even if it is not followed by a mention.
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events.push(Event::Text(text_acc.clone().into()))
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}
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(events, State::Word, text_acc, n + 1, mentions, hashtags)
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} else {
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if n >= (txt.chars().count() - 1) { // Add the text after at the end, even if it is not followed by a mention.
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events.push(Event::Text(text_acc.clone().into()))
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}
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(events, State::Ready, text_acc, n + 1, mentions, hashtags)
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}
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}
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}
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});
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(evts, new_mentions, new_hashtags)
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},
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_ => (vec![evt], vec![], vec![])
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}).fold((vec![],vec![],vec![]), |(mut parser, mut mention, mut hashtag), (mut p, mut m, mut h)| {
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parser.append(&mut p);
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mention.append(&mut m);
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hashtag.append(&mut h);
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(parser, mention, hashtag)
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});
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let parser = parser.into_iter();
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let mentions = mentions.into_iter().map(|m| String::from(m.trim()));
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let hashtags = hashtags.into_iter().map(|h| String::from(h.trim()));
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// TODO: fetch mentionned profiles in background, if needed
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let mut buf = String::new();
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html::push_html(&mut buf, parser);
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(buf, mentions.collect(), hashtags.collect())
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_mentions() {
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let tests = vec![
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("nothing", vec![]),
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("@mention", vec!["mention"]),
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("@mention@instance.tld", vec!["mention@instance.tld"]),
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("@many @mentions", vec!["many", "mentions"]),
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("@start with a mentions", vec!["start"]),
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("mention at @end", vec!["end"]),
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("between parenthesis (@test)", vec!["test"]),
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("with some punctuation @test!", vec!["test"]),
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(" @spaces ", vec!["spaces"]),
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("@is_a@mention", vec!["is_a@mention"]),
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("not_a@mention", vec![]),
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];
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for (md, mentions) in tests {
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assert_eq!(md_to_html(md, "").1, mentions.into_iter().map(|s| s.to_string()).collect::<HashSet<String>>());
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}
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}
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#[test]
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fn test_hashtags() {
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let tests = vec![
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("nothing", vec![]),
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("#hashtag", vec!["hashtag"]),
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("#many #hashtags", vec!["many", "hashtags"]),
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("#start with a hashtag", vec!["start"]),
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("hashtag at #end", vec!["end"]),
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("between parenthesis (#test)", vec!["test"]),
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("with some punctuation #test!", vec!["test"]),
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(" #spaces ", vec!["spaces"]),
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("not_a#hashtag", vec![]),
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];
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for (md, mentions) in tests {
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assert_eq!(md_to_html(md, "").2, mentions.into_iter().map(|s| s.to_string()).collect::<HashSet<String>>());
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}
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}
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}
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