Refactoring

src/con_handler.rs

@@ -0,0 +1,334 @@
+use new_mime_guess;
+use std::fs;
+use std::fs::File;
+use std::io::{self, BufRead, BufReader};
+use std::os::unix::fs::PermissionsExt;
+use std::path::PathBuf;
+use url::Url;
+
+use crate::util;
+use crate::conn;
+use crate::status::Status;
+use crate::cgi;
+use crate::logger;
+use crate::revproxy;
+
+type Result<T=()> = std::result::Result<T, Box<dyn std::error::Error + Send + Sync>>;
+
+fn get_mime(path: &PathBuf) -> String {
+    let mut mime = "text/gemini".to_string();
+    if path.is_dir() {
+        return mime;
+    }
+    let ext = match path.extension() {
+        Some(p) => p.to_str().unwrap(),
+        None => return "text/plain".to_string(),
+    };
+
+    mime = match new_mime_guess::from_ext(ext).first() {
+        Some(m) => m.essence_str().to_string(),
+        None => "text/plain".to_string(),
+    };
+
+    return mime;
+}
+
+async fn get_binary(mut con: conn::Connection, path: PathBuf, meta: String) -> io::Result<()> {
+    let fd = File::open(path)?;
+    let mut reader = BufReader::with_capacity(1024 * 1024, fd);
+    con.send_status(Status::Success, Some(&meta))
+        .await?;
+    loop {
+        let len = {
+            let buf = reader.fill_buf()?;
+            con.send_raw(buf).await?;
+            buf.len()
+        };
+        if len == 0 {
+            break;
+        }
+        reader.consume(len);
+    }
+    Ok(())
+}
+
+async fn get_content(path: PathBuf, u: &url::Url) -> Result<String> {
+    let meta = tokio::fs::metadata(&path).await?;
+    if meta.is_file() {
+        return Ok(tokio::fs::read_to_string(path).await?);
+    }
+
+    let mut dirs: Vec<String> = Vec::new();
+    let mut files: Vec<String> = Vec::new();
+
+    // needs work
+    for file in fs::read_dir(&path)? {
+        if let Ok(file) = file {
+            let m = file.metadata()?;
+            let perm = m.permissions();
+            if perm.mode() & 0o0444 != 0o0444 {
+                continue;
+            }
+            let file = file.path();
+            let p = file.strip_prefix(&path).unwrap();
+            let ps = match p.to_str() {
+                Some(s) => s,
+                None => continue,
+            };
+            let ep = match u.join(ps) {
+                Ok(p) => p,
+                _ => continue,
+            };
+            if m.is_dir() {
+                dirs.push(format!("=> {}/ {}/\r\n", ep, p.display()));
+            } else {
+                files.push(format!("=> {} {}\r\n", ep, p.display()));
+            }
+        }
+    }
+
+    dirs.sort();
+    files.sort();
+
+    let mut list = String::from("# Directory Listing\r\n\r\n");
+    list.push_str(&format!("Path: {}\r\n\r\n", u.path()));
+
+    for dir in dirs {
+        list.push_str(&dir);
+    }
+    for file in files {
+        list.push_str(&file);
+    }
+
+    return Ok(list);
+}
+
+// Handle CGI and return Ok(true), or indicate this request wasn't for CGI with Ok(false)
+#[cfg(feature = "cgi")]
+async fn handle_cgi(
+    con: &mut conn::Connection,
+    request: &str,
+    url: &Url,
+    full_path: &PathBuf,
+) -> Result<bool> {
+    if con.srv.server.cgi.unwrap_or(false) {
+        let mut path = full_path.clone();
+        let mut segments = url.path_segments().unwrap();
+        let mut path_info = "".to_string();
+
+        // Find an ancestor url that matches a file
+        while !path.exists() {
+            if let Some(segment) = segments.next_back() {
+                path.pop();
+                path_info = format!("/{}{}", &segment, path_info);
+            } else {
+                return Ok(false);
+            }
+        }
+        let script_name = format!("/{}", segments.collect::<Vec<_>>().join("/"));
+
+        let meta = tokio::fs::metadata(&path).await?;
+        let perm = meta.permissions();
+
+        match &con.srv.server.cgipath {
+            Some(c) => {
+            if path.starts_with(c) {
+                if perm.mode() & 0o0111 == 0o0111 {
+                    cgi::cgi(con, path, url, script_name, path_info).await?;
+                    return Ok(true);
+                } else {
+                    logger::logger(con.peer_addr, Status::CGIError, request);
+                    con.send_status(Status::CGIError, None).await?;
+                    return Ok(true);
+                }
+            }
+            },
+            None => {
+                if meta.is_file() && perm.mode() & 0o0111 == 0o0111 {
+                    cgi::cgi(con, path, url, script_name, path_info).await?;
+                    return Ok(true);
+                }
+            },
+        }
+    }
+    Ok(false)
+}
+
+// TODO Rewrite this monster.
+pub async fn handle_connection(
+    mut con: conn::Connection,
+    url: url::Url
+) -> Result {
+    let index = match &con.srv.server.index {
+        Some(i) => i.clone(),
+        None => "index.gemini".to_string(),
+    };
+
+    match &con.srv.server.redirect.to_owned() {
+        Some(re) => {
+            let u = match url.path() {
+                "/" => "/",
+                _ => url.path().trim_end_matches("/"),
+            };
+            match re.get(u) {
+                Some(r) => {
+                    logger::logger(con.peer_addr, Status::RedirectTemporary, &url.as_str());
+                    con.send_status(Status::RedirectTemporary, Some(r)).await?;
+                    return Ok(());
+                }
+                None => {}
+            }
+        }
+        None => {}
+    }
+
+    #[cfg(feature = "proxy")]
+    if let Some(pr) = con.srv.server.proxy_all.to_owned() {
+        let host_port: Vec<&str> = pr.splitn(2, ':').collect();
+        let host = host_port[0];
+        let port: Option<u16>;
+        if host_port.len() == 2 {
+            port = host_port[1].parse().ok();
+        } else {
+            port = None;
+        }
+
+        let mut upstream_url = url.clone();
+        upstream_url.set_host(Some(host)).unwrap();
+        upstream_url.set_port(port).unwrap();
+
+        revproxy::proxy_all(pr.as_str(), upstream_url, con).await?;
+        return Ok(());
+    }
+
+    #[cfg(feature = "proxy")]
+    match &con.srv.server.proxy {
+        Some(pr) => match url.path_segments().map(|c| c.collect::<Vec<_>>()) {
+            Some(s) => match pr.get(s[0]) {
+                Some(p) => {
+                    revproxy::proxy(p.to_string(), url, con).await?;
+                    return Ok(());
+                }
+                None => {}
+            },
+            None => {}
+        },
+        None => {}
+    }
+
+    #[cfg(feature = "scgi")]
+    match &con.srv.server.scgi {
+        Some(sc) => {
+            let u = match url.path() {
+                "/" => "/",
+                _ => url.path().trim_end_matches("/"),
+            };
+        match sc.get(u) {
+            Some(r) => {
+                cgi::scgi(r.to_string(), url, con).await?;
+                return Ok(());
+            }
+            None => {}
+        }
+        },
+        None => {},
+    }
+
+
+    let mut path = PathBuf::new();
+
+    if url.path().starts_with("/~") && con.srv.server.usrdir.unwrap_or(false) {
+        let usr = url.path().trim_start_matches("/~");
+        let usr: Vec<&str> = usr.splitn(2, "/").collect();
+        if cfg!(target_os = "macos") {
+            path.push("/Users/");
+        } else {
+            path.push("/home/");
+        }
+        if usr.len() == 2 {
+            path.push(format!("{}/{}/{}", usr[0], "public_gemini", util::url_decode(usr[1].as_bytes())));
+        } else {
+            path.push(format!("{}/{}/", usr[0], "public_gemini"));
+        }
+    } else {
+        path.push(&con.srv.server.dir);
+        if url.path() != "" || url.path() != "/" {
+            let decoded = util::url_decode(url.path().trim_start_matches("/").as_bytes());
+            path.push(decoded);
+        }
+    }
+
+    if !path.exists() {
+        // See if it's a subpath of a CGI script before returning NotFound
+        #[cfg(feature = "cgi")]
+        if handle_cgi(&mut con, &url.as_str(), &url, &path).await? {
+            return Ok(());
+        }
+
+        logger::logger(con.peer_addr, Status::NotFound, &url.as_str());
+        con.send_status(Status::NotFound, None).await?;
+        return Ok(());
+    }
+
+    let mut meta = tokio::fs::metadata(&path).await?;
+    let mut perm = meta.permissions();
+
+    // TODO fix me
+    // This block is terrible
+    if meta.is_dir() {
+        if !url.path().ends_with("/") {
+            logger::logger(con.peer_addr, Status::RedirectPermanent, &url.as_str());
+            con.send_status(
+                Status::RedirectPermanent,
+                Some(format!("{}/", url).as_str()),
+            )
+            .await?;
+            return Ok(());
+        }
+        if path.join(&index).exists() {
+            path.push(index);
+            meta = tokio::fs::metadata(&path).await?;
+            perm = meta.permissions();
+            if perm.mode() & 0o0444 != 0o444 {
+                let mut p = path.clone();
+                p.pop();
+                path.push(format!("{}/", p.display()));
+                meta = tokio::fs::metadata(&path).await?;
+                perm = meta.permissions();
+            }
+        }
+    }
+
+    #[cfg(feature = "cgi")]
+    if handle_cgi(&mut con, &url.as_str(), &url, &path).await? {
+        return Ok(());
+    }
+
+    if meta.is_file() && perm.mode() & 0o0111 == 0o0111  {
+        logger::logger(con.peer_addr, Status::NotFound, &url.as_str());
+        con.send_status(Status::NotFound, None).await?;
+        return Ok(());
+    }
+
+    if perm.mode() & 0o0444 != 0o0444  {
+        logger::logger(con.peer_addr, Status::NotFound, &url.as_str());
+        con.send_status(Status::NotFound, None).await?;
+        return Ok(());
+    }
+
+    let mut mime = get_mime(&path);
+    if mime == "text/gemini" && con.srv.server.lang.is_some() {
+        mime += &("; lang=".to_string() + &con.srv.server.lang.to_owned().unwrap());
+    }
+    if !mime.starts_with("text/") {
+        logger::logger(con.peer_addr, Status::Success, &url.as_str());
+        get_binary(con, path, mime).await?;
+        return Ok(());
+    }
+    let content = get_content(path, &url).await?;
+    con.send_body(Status::Success, Some(&mime), Some(content))
+        .await?;
+    logger::logger(con.peer_addr, Status::Success, &url.as_str());
+
+    Ok(())
+}