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+/target
+/data
+/ads
+/config.yaml
diff --git a/COPYING b/COPYING
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--- /dev/null
+++ b/COPYING
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+meta adservices server
+Copyright (C) 2024 metamuffin
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as
+published by the Free Software Foundation, version 3 of the
+License only.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU Affero General Public License is a free, copyleft license for
+software and other kinds of works, specifically designed to ensure
+cooperation with the community in the case of network server software.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+our General Public Licenses are intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  Developers that use our General Public Licenses protect your rights
+with two steps: (1) assert copyright on the software, and (2) offer
+you this License which gives you legal permission to copy, distribute
+and/or modify the software.
+
+  A secondary benefit of defending all users' freedom is that
+improvements made in alternate versions of the program, if they
+receive widespread use, become available for other developers to
+incorporate.  Many developers of free software are heartened and
+encouraged by the resulting cooperation.  However, in the case of
+software used on network servers, this result may fail to come about.
+The GNU General Public License permits making a modified version and
+letting the public access it on a server without ever releasing its
+source code to the public.
+
+  The GNU Affero General Public License is designed specifically to
+ensure that, in such cases, the modified source code becomes available
+to the community.  It requires the operator of a network server to
+provide the source code of the modified version running there to the
+users of that server.  Therefore, public use of a modified version, on
+a publicly accessible server, gives the public access to the source
+code of the modified version.
+
+  An older license, called the Affero General Public License and
+published by Affero, was designed to accomplish similar goals.  This is
+a different license, not a version of the Affero GPL, but Affero has
+released a new version of the Affero GPL which permits relicensing under
+this license.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
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+  "This License" refers to version 3 of the GNU Affero General Public License.
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+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.
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+
+[[package]]
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+
+[[package]]
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+
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14b9415ee827af173ebb3f15f9083df5a122eb93572ec28741fb153356ea2578"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "yansi"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cfe53a6657fd280eaa890a3bc59152892ffa3e30101319d168b781ed6529b049"
+dependencies = [
+ "is-terminal",
+]
+
+[[package]]
+name = "zerocopy"
+version = "0.8.0-alpha.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "db678a6ee512bd06adf35c35be471cae2f9c82a5aed2b5d15e03628c98bddd57"
+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.8.0-alpha.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "201585ea96d37ee69f2ac769925ca57160cef31acb137c16f38b02b76f4c1e62"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..f99789d
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "adservice"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+rocket = "0.5.0"
+markup = "0.15.0"
+env_logger = "0.11.3"
+log = "0.4.21"
+serde = { version = "1.0.199", features = ["derive"] }
+serde_yaml = "0.9"
+redb = "2.1.0"
+anyhow = "1.0.82"
+thiserror = "1.0.59"
+rand = "0.9.0-alpha.1"
diff --git a/readme.md b/readme.md
new file mode 100644
index 0000000..b1e1277
--- /dev/null
+++ b/readme.md
@@ -0,0 +1,4 @@
+# meta adservices
+
+A funny adservice. To promote each others projects or websites like one would in
+a webring.
diff --git a/src/embed.rs b/src/embed.rs
new file mode 100644
index 0000000..02dea2f
--- /dev/null
+++ b/src/embed.rs
@@ -0,0 +1,90 @@
+use crate::{error::MyResult, state::Logic, Template};
+use anyhow::anyhow;
+use log::warn;
+use markup::{doctype, DynRender};
+use rand::{seq::IndexedRandom, thread_rng};
+use rocket::{
+    get,
+    http::{Header, Status},
+    response::{self, Responder},
+    tokio::fs::File,
+    uri, Request, Response, State,
+};
+use std::net::IpAddr;
+
+#[get("/v1/embed?<s>")]
+pub async fn r_embed<'a>(
+    state: &State<Logic>,
+    addr: IpAddr,
+    s: &str,
+) -> MyResult<Template<DynRender<'a>>> {
+    let key = state
+        .ad_keys
+        .choose(&mut thread_rng())
+        .ok_or(anyhow!("no ads configured"))?;
+    let ad = state.config.ads.get(key).unwrap();
+
+    let image_url = uri!(r_image(key)).to_string();
+    let target_url = ad.target.clone();
+
+    if let Err(e) = state.register_impression(s, &key, addr).await {
+        warn!("could not register impression: {e}")
+    }
+
+    Ok(Template(markup::new! {
+        @doctype()
+        html {
+            head {
+                title { "advertisement by meta adservices" }
+                style {
+                    "*{user-select:none}"
+                    "body,p{margin:0px}"
+                    "div,p{position:absolute}"
+                    "p{font-size:11px;bottom:0px;right:0px;color:#fff;background-color:#0009}"
+                    "body{width:728px;height:90px;overflow:hidden;position:relative;background-color:grey}"
+                    "div{pointer-events:none;opacity:0;transition:opacity 0.5s;top:-64px;left:-300px;width:374px;background-color:#fffa}"
+                    "button:hover div{opacity:1}"
+                    "button{border:none;width:22px;height:22px}"
+                }
+            }
+            body {
+                a[href=&target_url,target="_blank"] { img[src=&image_url, width=728, height=90]; }
+                p {
+                    "Ad by meta "
+                    a[href="/", target="_blank"]{ button {
+                        "🛈"
+                        div {
+                            "advertisement by meta adservices." br;
+                            "meta adservices is a non-profit non-registered organisation" br;
+                            "eager to flooding the internet with useless ads." br;
+                            i{"(click for more information)"}
+                        }
+                    } }
+                }
+            }
+        }
+    }))
+}
+
+#[get("/v1/image?<k>")]
+pub async fn r_image(state: &State<Logic>, k: &str) -> MyResult<CachedFile> {
+    let info = state
+        .config
+        .ads
+        .get(&k.to_owned())
+        .ok_or(anyhow!("ad does not exist"))?;
+    Ok(CachedFile(
+        File::open(state.config.image_base.join(&info.image)).await?,
+    ))
+}
+
+pub struct CachedFile(File);
+impl<'r> Responder<'r, 'static> for CachedFile {
+    fn respond_to(self, _req: &'r Request<'_>) -> response::Result<'static> {
+        Response::build()
+            .status(Status::Ok)
+            .header(Header::new("cache-control", "max-age=3600, public"))
+            .streamed_body(self.0)
+            .ok()
+    }
+}
diff --git a/src/error.rs b/src/error.rs
new file mode 100644
index 0000000..04d7e38
--- /dev/null
+++ b/src/error.rs
@@ -0,0 +1,27 @@
+use std::fmt::Display;
+
+use rocket::{
+    response::{self, Responder},
+    Request,
+};
+use thiserror::Error;
+
+pub type MyResult<T> = Result<T, MyError>;
+
+#[derive(Debug, Error)]
+pub enum MyError {
+    Anyhow(#[from] anyhow::Error),
+    Io(#[from] std::io::Error),
+}
+
+impl<'r> Responder<'r, 'static> for MyError {
+    fn respond_to(self, req: &'r Request<'_>) -> response::Result<'static> {
+        format!("{self}").respond_to(req)
+    }
+}
+
+impl Display for MyError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{self:?}")
+    }
+}
diff --git a/src/info.rs b/src/info.rs
new file mode 100644
index 0000000..433bb13
--- /dev/null
+++ b/src/info.rs
@@ -0,0 +1,58 @@
+use crate::{s_file, Template};
+use markup::{doctype, DynRender};
+use rocket::{get, http::ContentType};
+
+#[get("/")]
+pub fn r_index<'a>() -> Template<DynRender<'a>> {
+    Template(markup::new! {
+        @doctype()
+        html {
+            head {
+                title { "meta adservices" }
+                meta[name="viewport", content="width=device-width, initial-scale=1.0"];
+                meta[name="description", content="advertise now with meta adservices"];
+                link[rel="stylesheet", href="/style.css"];
+            }
+            body {
+                h1 { "meta adservices" }
+                p {
+                    "meta adservices is the leading provider of useless images within iframes. "
+                }
+
+                h2 { "sample ad" }
+                iframe[src="/v1/embed?s=adservices.metamuffin.org", style="border:none;width:728px;height:90px;"] {}
+                h2 { "privacy" }
+                p { "data used by meta adservices: " }
+                ul {
+                    li { "Your IP address" }
+                    li { "The Advertisement site (where the ad was shown)" }
+                }
+                p { "data stored by meta adservices: " }
+                ul {
+                    li { "Your IP address is used within a bloom filter in volatile memory." }
+                    li { "Your requests increment a persistent public counter per ad site (according to a weighting function)." }
+                }
+            }
+        }
+    })
+}
+
+#[get("/style.css")]
+pub fn r_style() -> (ContentType, String) {
+    (ContentType::CSS, s_file!("style.css"))
+}
+
+#[cfg(not(debug_assertions))]
+#[macro_export]
+macro_rules! s_file {
+    ($path: literal) => {
+        include_str!($path).to_string(),
+    };
+}
+#[cfg(debug_assertions)]
+#[macro_export]
+macro_rules! s_file {
+    ($path: literal) => {
+        std::fs::read_to_string(concat!("src/", $path)).unwrap()
+    };
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..8a20982
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,62 @@
+#![feature(ip_bits)]
+pub mod embed;
+pub mod error;
+pub mod info;
+pub mod state;
+use embed::*;
+use info::*;
+
+use markup::Render;
+use rocket::{
+    catch, catchers,
+    fairing::AdHoc,
+    http::{ContentType, Header, Status},
+    response::{self, Responder},
+    routes, Request, Response,
+};
+use state::{Config, Logic};
+use std::io::Cursor;
+
+#[rocket::main]
+async fn main() {
+    env_logger::init_from_env("LOG");
+
+    let config = std::env::args()
+        .nth(1)
+        .expect("first arg needs to be the config");
+    let config = rocket::tokio::fs::read_to_string(config)
+        .await
+        .expect("could not read config");
+    let config: Config = serde_yaml::from_str(config.as_str()).expect("config invalid");
+
+    let state = Logic::new(config);
+
+    let _ = rocket::build()
+        .attach(AdHoc::on_response("set server header", |_req, res| {
+            res.set_header(Header::new("server", "meta adservices"));
+            Box::pin(async {})
+        }))
+        .manage(state)
+        .mount("/", routes![r_index, r_embed, r_style, r_image])
+        .register("/", catchers![r_catch])
+        .launch()
+        .await
+        .unwrap();
+}
+
+pub struct Template<T>(pub T);
+impl<'r, T: Render> Responder<'r, 'static> for Template<T> {
+    fn respond_to(self, _req: &'r Request<'_>) -> response::Result<'static> {
+        let mut out = String::new();
+        self.0.render(&mut out).unwrap();
+        Response::build()
+            .header(ContentType::HTML)
+            .streamed_body(Cursor::new(out))
+            .ok()
+    }
+}
+
+#[catch(default)]
+pub fn r_catch<'a>(status: Status, _request: &Request) -> String {
+    format!("{status}; This ad is likely misconfigured. Server could also be broken...")
+}
diff --git a/src/state.rs b/src/state.rs
new file mode 100644
index 0000000..4de21b4
--- /dev/null
+++ b/src/state.rs
@@ -0,0 +1,105 @@
+use anyhow::Context;
+use redb::{Database, ReadableTable, TableDefinition};
+use rocket::tokio::sync::Mutex;
+use serde::Deserialize;
+use std::{collections::HashMap, net::IpAddr, path::PathBuf};
+
+#[derive(Deserialize)]
+pub struct AdInfo {
+    pub image: PathBuf,
+    pub target: String,
+}
+
+#[derive(Deserialize)]
+pub struct Config {
+    bloom_filter_size: usize,
+    impression_weight_falloff: f64,
+    pub image_base: PathBuf,
+    database_path: PathBuf,
+    pub ads: HashMap<String, AdInfo>,
+}
+
+pub struct Logic {
+    pub config: Config,
+    database: Database,
+    impressions_by_addr: Mutex<Vec<u16>>,
+    pub ad_keys: Vec<String>,
+}
+
+static T_TOTAL: TableDefinition<'static, (), u128> = TableDefinition::new("t");
+static T_IMPRESSIONS_RAW: TableDefinition<'static, &str, u128> = TableDefinition::new("ir");
+static T_IMPRESSIONS_WEIGHTED: TableDefinition<'static, &str, f64> = TableDefinition::new("iw");
+static T_ADS: TableDefinition<'static, &str, u128> = TableDefinition::new("a");
+
+impl Logic {
+    pub fn new(config: Config) -> Self {
+        Self {
+            impressions_by_addr: vec![0; config.bloom_filter_size].into(),
+            database: {
+                let db = Database::create(&config.database_path).expect("database open failed");
+                {
+                    let txn = db.begin_write().unwrap();
+                    txn.open_table(T_IMPRESSIONS_RAW).unwrap();
+                    txn.open_table(T_IMPRESSIONS_WEIGHTED).unwrap();
+                    txn.open_table(T_ADS).unwrap();
+                }
+                db
+            },
+            ad_keys: config.ads.keys().map(String::from).collect(),
+            config,
+        }
+    }
+
+    pub async fn register_impression(
+        &self,
+        site: &str,
+        adid: &str,
+        address: IpAddr,
+    ) -> anyhow::Result<()> {
+        let num_impressions = {
+            let mut bloom = self.impressions_by_addr.lock().await;
+            let ind = (xorshift(xorshift(xorshift(
+                match address {
+                    IpAddr::V4(a) => a.to_ipv6_mapped(),
+                    IpAddr::V6(a) => a,
+                }
+                .to_bits() as u64,
+            ))) % bloom.len() as u64) as usize;
+            bloom[ind] = bloom[ind].saturating_add(1);
+            bloom[ind]
+        } as f64;
+
+        let weight = self.config.impression_weight_falloff.powf(num_impressions);
+
+        let txn = self.database.begin_write().context("database failure")?;
+        {
+            let mut raw = txn.open_table(T_TOTAL)?;
+            let v = raw.get(())?.map(|g| g.value()).unwrap_or_default();
+            raw.insert((), v + 1)?;
+        }
+        {
+            let mut raw = txn.open_table(T_IMPRESSIONS_RAW)?;
+            let v = raw.get(site)?.map(|g| g.value()).unwrap_or_default();
+            raw.insert(site, v + 1)?;
+        }
+        {
+            let mut raw = txn.open_table(T_IMPRESSIONS_WEIGHTED)?;
+            let v = raw.get(site)?.map(|g| g.value()).unwrap_or_default();
+            raw.insert(site, v + weight)?;
+        }
+        {
+            let mut raw = txn.open_table(T_ADS)?;
+            let v = raw.get(site)?.map(|g| g.value()).unwrap_or_default();
+            raw.insert(adid, v + 1)?;
+        }
+        txn.commit().context("database failure")?;
+        Ok(())
+    }
+}
+
+fn xorshift(mut x: u64) -> u64 {
+    x ^= x << 13;
+    x ^= x >> 7;
+    x ^= x << 17;
+    x
+}
diff --git a/src/style.css b/src/style.css
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/src/style.css
@@ -0,0 +1 @@
+