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use std::io::Write;
use dumb_cgi::{Request, EmptyResponse, Query};
use postgres::{Client, NoTls};
use std::process::exit;
use regex::Regex;
use dotenv;
use url::Url;
use rand::{thread_rng, Rng, distributions::Alphanumeric};
// Do the dirty
fn main() {
// short = ID for shortened url
// url = url to be shortened / that has been shortened
// shorturl = full shortened url
// shortprefix = part of url that comes before short id
// docuri = DOCUMENT_URI from http request. This is everything after the domain.
// Example: "/hey" in "https://example.com/hey"
// Connect to db
let dburl:String = dotenv::var("DATABASE_URL").unwrap();
let mut db = Client::connect(&dburl, NoTls).unwrap();
// TODO: Close connection when done.
//
let shortprefix = dotenv::var("SHORTPREFIX").unwrap();
// Gather all request data from the environment and stdin.
let req = Request::new().unwrap();
// Find out what action we're performing
let action:&str = req.var("ACTION").unwrap_or("none");
if action == "form" {
print_form();
}
else if action == "redirect" {
// get DOCUMENT_URI
let docuri:&str = req.var("DOCUMENT_URI").unwrap_or("");
if docuri == "" {
respond(400, "No short provided");
}
// Trim / and + from start
let docuri = docuri.trim_start_matches(&['/', '+']);
// Make SURE docuri is a valid short
let shortregex = Regex::new(r"^[a-zA-Z0-9_-]+$").unwrap();
if !shortregex.is_match(docuri) {
respond(400, "Not a valid short");
}
// Fetch URL from postgres, and redirect or return 404
let sql = "SELECT url FROM shorts WHERE short = $1 LIMIT 1";
match db.query_opt(sql, &[&docuri]).unwrap() {
None => respond(404, ""),
Some(row) => {
let sql = "UPDATE shorts SET count = count + 1, last_visited = now() WHERE short = $1;";
db.execute(sql, &[&docuri]).unwrap();
respond(301, row.get("url"));
},
}
}
else if action == "create" {
let url:&str = match req.query() {
Query::None => "Error, no url in query",
Query::Err(_e) => "Error reading query string",
Query::Some(map) => {
if !map.contains_key("url") {
"Error, no url in query"
} else {
&map["url"]
}
},
};
if url.starts_with("Error") {
respond(400, url);
} else if !Url::parse(url).is_ok() {
respond(400, "Invalid url");
}
let user:&str = req.var("REMOTE_USER").unwrap_or("none");
let mut short:String = gen_short();
for i in 1..5 {
let sql = "SELECT url FROM shorts WHERE short = $1 LIMIT 1";
match db.query_opt(sql, &[&short]).unwrap() {
Some(_row) => short = gen_short(), // If a row was returned, the short was not unique. Continue loop
None => break, // If nothing was returned, the short IS unique. Break out of loop
}
// Throw error if we couldn't create a unique short in fire tries
if i == 5 { respond(500, "Could not find unique short"); }
}
let sql = "INSERT INTO shorts (url, short, created_by) VALUES ($1, $2, $3);";
match db.execute(sql, &[&url, &short, &user]) {
Ok(_v) => respond(200, &format!("{}{}", shortprefix, short)),
Err(_e) => respond(500, "Could not save shortened url to database"),
};
exit(0);
}
else {
respond(400, "");
}
}
// send cgi-response
fn respond(code:u16, body:&str) {
// initiate response
let mut r = EmptyResponse::new(code)
.with_content_type("text/plain");
// is 300 <= status < 400, and body is a url, perform redirection
if (300..399).contains(&code) && Url::parse(body).is_ok() {
r.add_header("Location", body);
}
// if status >= 300, we want to include status text in the response
if code >= 300 {
let mut toptext = format!("{} {}\n", code, status(code));
if !body.is_empty() { toptext.push_str("\n"); }
write!(&mut r, "{toptext}").unwrap();
}
if body != "" {
// write body
write!(&mut r, "{}\n", body).unwrap();
}
// respond
r.respond().unwrap();
exit(0);
}
// HTTP status codes
fn status<'a>(code:u16) -> &'a str {
// I've only implemented statuscodes I *might* use
return match code {
200 => "OK",
201 => "Created",
202 => "Accepted",
204 => "No Content",
301 => "Moved Permanently",
302 => "Found",
304 => "Not Modified",
307 => "Temporary Redirect",
308 => "Permanent Redirect",
400 => "Bad Request",
401 => "Unauthorized",
402 => "Payment Required",
403 => "Forbidden",
404 => "Not Found",
405 => "Method Not Allowed",
406 => "Not Acceptableo",
410 => "Gone",
414 => "URI Too Long",
500 => "Internal Server Error",
501 => "Not Implemented",
503 => "Service Unavailable",
508 => "Loop Detected",
_ => "Not Found",
};
}
// Print form
fn print_form() {
let body = r#"<html>
<head>
<title>PURL</title>
</head>
<body>
<form method="post" action="/purl.cgi" enctype="multipart/form-data" name="main">
Username: $user<br>
URL to shorten: <input type="text" name="url" size="50"><br>
Custom short: <input type="text" name="short"><br>
<input type="hidden" name="form" value="html">
<input type="submit" value="Submit">
</form>
</body>
</html>
"#;
respond(200, body);
}
// Generate random short
fn gen_short() -> String {
let rand_string: String = thread_rng()
.sample_iter(&Alphanumeric)
.take(thread_rng().gen_range(2..6))
.map(char::from)
.collect();
return rand_string;
}
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