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|
extern crate regex;
extern crate reqwest;
extern crate select;
use irc::client::prelude::*;
use irc::error::IrcError;
use self::regex::Regex;
use std::str;
use std::io::{self, Read};
use self::reqwest::Client;
use self::reqwest::header::Connection;
use self::select::document::Document;
use self::select::predicate::Name;
use plugin::*;
lazy_static! {
static ref RE: Regex = Regex::new(r"(^|\s)(https?://\S+)").unwrap();
}
#[derive(PluginName, Debug)]
pub struct Url {
max_kib: usize,
}
impl Url {
/// If a file is larger than `max_kib` KiB the download is stopped
pub fn new(max_kib: usize) -> Url {
Url {max_kib: max_kib}
}
fn grep_url(&self, msg: &str) -> Option<String> {
match RE.captures(msg) {
Some(captures) => {
debug!("Url captures: {:?}", captures);
Some(captures.get(2).unwrap().as_str().to_string())
}
None => None,
}
}
fn download(&self, url: &str) -> Option<String> {
let response = Client::new()
.get(url)
.header(Connection::close())
.send();
match response {
Ok(mut response) => {
let mut body = String::new();
// 500 kilobyte buffer
let mut buf = [0; 500 * 1000];
let mut written = 0;
// Read until we reach EOF or max_kib KiB
loop {
let len = match response.read(&mut buf) {
Ok(0) => break,
Ok(len) => len,
Err(ref e) if e.kind() == io::ErrorKind::Interrupted => continue,
Err(e) => {
debug!("Download from {:?} failed: {}", url, e);
return None;
}
};
let slice = match str::from_utf8(&buf[..len]) {
Ok(slice) => slice,
Err(e) => {
debug!("Failed to read bytes from {:?} as UTF8: {}", url, e);
return None;
}
};
body.push_str(slice);
written += len;
// Check if the file is too large to download
if written > self.max_kib * 1024 {
debug!("Stopping download - File from {:?} is larger than {} KiB", url, self.max_kib);
return None;
}
}
Some(body) // once told me
}
Err(e) => {
debug!("Bad response from {:?}: ({})", url, e);
return None;
}
}
}
fn url(&self, text: &str) -> Result<String, &str> {
let url = match self.grep_url(text) {
Some(url) => url,
None => {
return Err("No Url was found.")
}
};
match self.download(&url) {
Some(body) => {
let doc = Document::from(body.as_ref());
if let Some(title) = doc.find(Name("title")).next() {
let title = title.children().next().unwrap();
let title_text = title.as_text().unwrap().trim().replace("\n", "|");
debug!("Title: {:?}", title);
debug!("Text: {:?}", title_text);
Ok(title_text)
} else {
Err("No title was found.")
}
}
None => Err("Failed to download document.")
}
}
}
impl Plugin for Url {
fn is_allowed(&self, _: &IrcClient, message: &Message) -> bool {
match message.command {
Command::PRIVMSG(_, ref msg) => RE.is_match(msg),
_ => false,
}
}
fn execute(&self, server: &IrcClient, message: &Message) -> Result<(), IrcError> {
match message.command {
Command::PRIVMSG(_, ref content) => {
match self.url(content) {
Ok(title) => server.send_privmsg(&message.response_target().unwrap(), &title),
Err(_) => Ok(()),
}
}
_ => Ok(()),
}
}
fn command(&self, server: &IrcClient, command: PluginCommand) -> Result<(), IrcError> {
server.send_notice(&command.source,
"This Plugin does not implement any commands.")
}
fn evaluate(&self, _: &IrcClient, command: PluginCommand) -> Result<String, String> {
self.url(&command.tokens[0]).map_err(|e| String::from(e))
}
}
#[cfg(test)]
mod tests {}
|
