commit ecaad53bebbbec98f331307baf185b352c4c58a5
Author: Ondřej Hruška <ondra@ondrovo.com>
Date:   Sun May 10 15:57:55 2020 +0200

    working prototype

diff --git a/.gitignore b/.gitignore
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..f2a8969
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "postit"
+version = "0.1.0"
+authors = ["Ondřej Hruška <ondra@ondrovo.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+clappconfig = "0.3.1"
+rouille = "3.0.0"
+parking_lot = "0.10.2"
+serde_json = "1.0.52"
+serde = "1.0.106"
+serde_derive = "1.0"
+log = "0.4.8"
+siphasher = "0.3.3"
+rand = "0.7.3"
diff --git a/src/config.rs b/src/config.rs
new file mode 100644
index 0000000..85d641b
--- /dev/null
+++ b/src/config.rs
@@ -0,0 +1,91 @@
+use clappconfig::{AppConfig, anyhow, clap::ArgMatches};
+use std::collections::HashMap;
+use std::time::Duration;
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(default)]
+#[serde(deny_unknown_fields)]
+pub(crate) struct Config {
+    /// Log level
+    pub(crate) logging: String,
+
+    /// Per-module log levels
+    pub(crate) log_levels: HashMap<String, String>,
+
+    /// Server bind address
+    pub(crate) host: String,
+
+    /// Server port
+    pub(crate) port: u16,
+
+    /// Default expiry time in seconds
+    #[serde(with = "serde_duration_secs")]
+    pub(crate) default_expiry: Duration,
+
+    /// Max expiry time in seconds
+    #[serde(with = "serde_duration_secs")]
+    pub(crate) max_expiry: Duration,
+
+    /// Expired post clearing interval (triggered on write)
+    #[serde(with = "serde_duration_secs")]
+    pub(crate) expired_gc_interval: Duration,
+
+    /// Max uploaded file size in bytes
+    pub(crate) max_file_size: usize,
+}
+
+impl Default for Config {
+    fn default() -> Self {
+        Self {
+            logging: "debug".to_string(),
+            log_levels: Default::default(),
+            host: "0.0.0.0".to_string(),
+            port: 7745,
+            default_expiry: Duration::from_secs(60 * 10),
+            max_expiry: Duration::from_secs(60 * 10),
+            expired_gc_interval: Duration::from_secs(60),
+            max_file_size: 1 * (1024 * 1024) // 1MB
+        }
+    }
+}
+
+impl AppConfig for Config {
+    type Init = Config;
+
+    fn logging(&self) -> &str {
+        &self.logging
+    }
+
+    fn logging_mod_levels(&self) -> Option<&HashMap<String, String>> {
+        Some(&self.log_levels)
+    }
+
+    fn configure(self, _clap: &ArgMatches) -> anyhow::Result<Self::Init> {
+        Ok(self)
+    }
+}
+
+mod serde_duration_secs {
+    use serde::{self, Deserialize, Serializer, Deserializer};
+    use std::time::Duration;
+
+    pub fn serialize<S>(
+        value: &Duration,
+        se: S,
+    ) -> Result<S::Ok, S::Error>
+        where
+            S: Serializer,
+    {
+        se.serialize_u64(value.as_secs())
+    }
+
+    pub fn deserialize<'de, D>(
+        de: D,
+    ) -> Result<Duration, D::Error>
+        where
+            D: Deserializer<'de>,
+    {
+        let s: u64 = u64::deserialize(de)?;
+        Ok(Duration::from_secs(s))
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..413f788
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,400 @@
+#[macro_use] extern crate serde_derive;
+#[macro_use] extern crate log;
+
+use std::time::{Instant, Duration};
+use parking_lot::Mutex;
+use std::collections::HashMap;
+use clappconfig::{AppConfig, anyhow};
+use std::io::Read;
+use std::hash::{Hash, Hasher};
+use rand::rngs::OsRng;
+use rand::Rng;
+use rouille::{Request, Response, ResponseBody};
+use std::borrow::Cow;
+use crate::config::Config;
+
+mod config;
+
+fn error_with_text(code : u16, text : impl Into<String>) -> Response {
+    Response {
+        status_code: code,
+        headers: vec![("Content-Type".into(), "text/plain; charset=utf8".into())],
+        data: rouille::ResponseBody::from_string(text),
+        upgrade: None,
+    }
+}
+
+fn empty_error(code : u16) -> Response {
+    Response {
+        status_code: code,
+        headers: vec![("Content-Type".into(), "text/plain; charset=utf8".into())],
+        data: rouille::ResponseBody::empty(),
+        upgrade: None,
+    }
+}
+
+type PostId = u64;
+type Secret = u64;
+type DataHash = u64;
+
+#[derive(Debug)]
+struct Post {
+    mime : Cow<'static, str>,
+    hash : DataHash,
+    secret : Secret,
+    expires : Instant,
+}
+
+impl Post {
+    pub fn is_expired(&self) -> bool {
+        self.expires < Instant::now()
+    }
+}
+
+fn main() -> anyhow::Result<()> {
+    let config = Config::init("postit", "postit.json", None)?;
+    let serve_at = format!("{}:{}", config.host, config.port);
+
+    let store = Mutex::new(Repository::new(config));
+
+    rouille::start_server(serve_at, move |req| {
+        let mut store_w = store.lock();
+        let method = req.method();
+
+        info!("{} {}", method, req.raw_url());
+
+        store_w.gc_expired_posts_if_needed();
+
+        match method {
+            "POST" | "PUT" => {
+                store_w.serve_post_put(req)
+            }
+            "GET" | "HEAD" => {
+                store_w.serve_get_head(req)
+            }
+            "DELETE" => {
+                store_w.serve_delete(req)
+            }
+            _ => {
+                rouille::Response::empty_400()
+            }
+        }
+    });
+}
+
+type PostsMap = HashMap<PostId, Post>;
+type DataMap = HashMap<DataHash, (usize, Vec<u8>)>;
+
+struct Repository {
+    config: Config,
+    posts: PostsMap,
+    /// (use_count, data)
+    data: DataMap,
+    /// Time of last expired posts GC
+    last_gc_time: Instant,
+}
+
+impl Repository {
+    fn new(config: Config) -> Self {
+        Repository {
+            config,
+            posts: Default::default(),
+            data: Default::default(),
+            last_gc_time: Instant::now(),
+        }
+    }
+
+    fn serve_delete(&mut self, req : &Request) -> Response {
+        let post_id = match self.request_to_post_id(req, true) {
+            Ok(Some(pid)) => pid,
+            Ok(None) => return error_with_text(400, "Post ID required."),
+            Err(resp) => return resp
+        };
+
+        self.delete_post(post_id);
+
+        Response::text("Deleted.")
+    }
+
+    fn serve_post_put(&mut self, req : &Request) -> Response {
+        let post_id = match self.request_to_post_id(req, true) {
+            Ok(pid) => {
+                if req.method() == "PUT" && pid.is_none() {
+                    return error_with_text(400, "PUT requires a file ID!");
+                } else if req.method() == "POST" && pid.is_some() {
+                    return error_with_text(400, "Use PUT to update a file!");
+                }
+
+                pid
+            },
+            Err(resp) => return resp
+        };
+
+        debug!("Submit new data, post ID: {:?}", post_id);
+
+        let mut data = vec![];
+        if let Some(body) = req.data() {
+            // Read up to 1 byte past the limit to catch too large uploads.
+            // We can't reply on the "Length" field, which is not present with chunked encoding.
+            body.take(self.config.max_file_size as u64 + 1).read_to_end(&mut data).unwrap();
+            if data.len() > self.config.max_file_size {
+                return empty_error(413);
+            }
+        } else {
+            return error_with_text(400, "Empty body!");
+        }
+
+        let mime = match req.header("Content-Type") {
+            None => None,
+            Some("application/x-www-form-urlencoded") => Some("text/plain"),
+            Some(v) => Some(v),
+        };
+
+        let expiry = match req.header("X-Expires") {
+            Some(text) => {
+                match text.parse() {
+                    Ok(v) => {
+                        let dur = Duration::from_secs(v);
+                        if dur > self.config.max_expiry {
+                            return error_with_text(400,
+                                                   format!("Expiration time {} out of allowed range 0-{} s",
+                                                           v,
+                                                           self.config.max_expiry.as_secs()
+                                                   ));
+                        }
+                        Some(dur)
+                    },
+                    Err(_) => {
+                        return error_with_text(400, "Malformed \"X-Expires\", use relative time in seconds.");
+                    },
+                }
+            }
+            None => None
+        };
+
+        if let Some(id) = post_id {
+            // UPDATE
+            self.update(id, data, mime, expiry);
+            Response::text("Updated.")
+        } else {
+            // INSERT
+            let (id, token) = self.insert(data, mime, expiry.unwrap_or(self.config.default_expiry));
+
+            Response::text(format!("{:016x}", id))
+                .with_additional_header("X-Secret", format!("{:016x}", token))
+        }
+    }
+
+    fn serve_get_head(&mut self, req : &Request) -> Response {
+        let post_id = match self.request_to_post_id(req, false) {
+            Ok(Some(pid)) => pid,
+            Ok(None) => return error_with_text(400, "Post ID required."),
+            Err(resp) => return resp
+        };
+
+        if let Some(post) = self.posts.get(&post_id) {
+            if post.is_expired() {
+                warn!("GET of expired post!");
+                Response::empty_404()
+            } else {
+                let data = self.data.get(&post.hash);
+                if data.is_none() {
+                    error!("No matching data!");
+                    return error_with_text(500, "File data lost.");
+                }
+
+                Response {
+                    status_code: 200,
+                    headers: vec![("Content-Type".into(), format!("{}; charset=utf8", post.mime).into())],
+                    data: if req.method() == "HEAD" {
+                        ResponseBody::empty()
+                    } else {
+                        ResponseBody::from_data(data.unwrap().1.clone())
+                    },
+                    upgrade: None,
+                }
+            }
+        } else {
+            warn!("No such post!");
+            Response::empty_404()
+        }
+    }
+
+    fn request_to_post_id(&self, req : &Request, check_secret : bool) -> Result<Option<PostId>, Response> {
+        let url = req.url();
+        let stripped = url.trim_matches('/');
+
+        if stripped.is_empty() {
+            // No ID given
+            return Ok(None);
+        }
+
+        let id = match u64::from_str_radix(stripped, 16) {
+            Ok(bytes) => bytes,
+            Err(_) => {
+                return Err(error_with_text(400, "Bad file ID format!"));
+            },
+        };
+
+        if check_secret {
+            // Check the write token
+            match self.posts.get(&id) {
+                None/* | Some(_p) if _p.is_expired()*/ => {
+                    return Err(error_with_text(404, "No file with this ID!"));
+                },
+                Some(post) => {
+                    if post.is_expired() {
+                        warn!("Access of expired post!");
+                        return Err(error_with_text(404, "No file with this ID!"));
+                    }
+
+                    let secret: u64 = match req.header("X-Secret").map(|v| u64::from_str_radix(v, 16)) {
+                        Some(Ok(bytes)) => bytes,
+                        None => {
+                            return Err(error_with_text(400, "X-Secret required!"));
+                        }
+                        Some(Err(e)) => {
+                            warn!("{:?}", e);
+                            return Err(error_with_text(400, "Bad secret format!"));
+                        },
+                    };
+
+                    if post.secret != secret {
+                        return Err(error_with_text(401, "Invalid secret!"));
+                    }
+                },
+            }
+        }
+
+        // secret is now validated and we got an ID
+        Ok(Some(id))
+    }
+
+    fn gc_expired_posts_if_needed(&mut self) {
+        if self.last_gc_time.elapsed() > self.config.expired_gc_interval {
+            self.gc_expired_posts();
+            self.last_gc_time = Instant::now();
+        }
+    }
+
+    fn gc_expired_posts(&mut self) {
+        debug!("GC expired posts");
+
+        let mut to_rm = vec![];
+        for post in &self.posts {
+            if post.1.is_expired() {
+                to_rm.push(*post.0);
+            }
+        }
+
+        for id in to_rm {
+            debug!("Drop post ID {:016x}", id);
+            if let Some(post) = self.posts.remove(&id) {
+                Self::drop_data_or_decrement_rc(&mut self.data, post.hash);
+            }
+        }
+    }
+
+    fn hash_data(data : &Vec<u8>) -> DataHash {
+        let mut hasher = siphasher::sip::SipHasher::new();
+        data.hash(&mut hasher);
+        hasher.finish()
+    }
+
+    fn store_data_or_increment_rc(data_map : &mut DataMap, hash : u64, data: Vec<u8>) {
+        match data_map.get_mut(&hash) {
+            None => {
+                debug!("Store new data hash #{:016x}", hash);
+                data_map.insert(hash, (1, data));
+            },
+            Some(entry) => {
+                debug!("Link new use of data hash #{:016x}", hash);
+                entry.0 += 1; // increment use counter
+            },
+        }
+    }
+
+    fn drop_data_or_decrement_rc(data_map : &mut DataMap, hash : u64) {
+        if let Some(old_data) = data_map.get_mut(&hash) {
+            if old_data.0 > 1 {
+                old_data.0 -= 1;
+                debug!("Unlink use of data hash #{:016x} ({} remain)", hash, old_data.0);
+            } else {
+                debug!("Drop data hash #{:016x}", hash);
+                data_map.remove(&hash);
+            }
+        }
+    }
+
+    fn insert(&mut self, data : Vec<u8>, mime : Option<&str>, expires : Duration) -> (PostId, Secret) {
+        info!("Insert post with data of len {} bytes, mime {}, expiry {:?}",
+              data.len(), mime.unwrap_or("unspecified"),
+              expires);
+
+        let hash = Self::hash_data(&data);
+
+        Self::store_data_or_increment_rc(&mut self.data, hash, data);
+
+        let post_id = loop {
+            let id = OsRng.gen();
+            if !self.posts.contains_key(&id) {
+                break id;
+            }
+        };
+
+        let secret = OsRng.gen();
+
+        debug!("Data hash = #{:016x}", hash);
+        debug!("Post ID = #{:016x}", post_id);
+        debug!("Secret = #{:016x}", secret);
+
+        self.posts.insert(post_id, Post {
+            mime: mime.map(ToString::to_string).map(Cow::Owned)
+                .unwrap_or(Cow::Borrowed("application/octet-stream")),
+            hash,
+            secret,
+            expires: Instant::now() + expires
+        });
+
+        (post_id, secret)
+    }
+
+    fn update(&mut self, id : PostId, data : Vec<u8>, mime : Option<&str>, expires : Option<Duration>) {
+        info!("Update post id #{:016x} with data of len {} bytes, mime {}, expiry {}",
+               id, data.len(), mime.unwrap_or("unchanged"),
+               expires.map(|v| Cow::Owned(format!("{:?}", v)))
+                   .unwrap_or("unchanged".into()));
+
+        let hash = Self::hash_data(&data);
+        let post = self.posts.get_mut(&id).unwrap(); // post existence was checked before
+
+        if hash != post.hash {
+            debug!("Data hash = #{:016x} (content changed)", hash);
+
+            Self::drop_data_or_decrement_rc(&mut self.data, post.hash);
+            Self::store_data_or_increment_rc(&mut self.data, hash, data);
+            post.hash = hash;
+        } else {
+            debug!("Data hash = #{:016x} (no change)", hash);
+        }
+
+        if let Some(mime) = mime {
+            if &post.mime != mime {
+                debug!("Content type changed to {}", mime);
+                post.mime = Cow::Owned(mime.to_string());
+            }
+        }
+
+        if let Some(exp) = expires {
+            debug!("Expiration changed to {:?} from now", exp);
+            post.expires = Instant::now() + exp;
+        }
+    }
+
+    fn delete_post(&mut self, id : PostId) {
+        info!("Delete post id #{:016x}", id);
+
+        let post = self.posts.remove(&id).unwrap(); // post existence was checked before
+        Self::drop_data_or_decrement_rc(&mut self.data, post.hash);
+    }
+}