update version

.gitignore

@@ -1,3 +1,4 @@
 /target
 /.vscode
 /config.toml
+*.db

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "website"]
+	path = website
+	url = https://git.libre-chip.org/libre-chip/website.git

Cargo.toml

@@ -1,16 +1,22 @@
 [package]
 name = "subscribe-list"
-version = "0.1.0"
+version = "0.1.2"
 edition = "2021"
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+authors = ["Jacob Lifshay <programmerjake@gmail.com>"]
+description = "web server for managing subscriptions"
+license = "GPL-3.0-or-later"
+publish = false
 
 [dependencies]
 actix-session = { version = "0.9.0", features = ["cookie-session"] }
 actix-web = { version = "4.5.1", features = ["secure-cookies"] }
+chrono = { version = "0.4.37", features = ["now"] }
 clap = { version = "4.5.4", features = ["derive"] }
 clio = { version = "0.3.5", features = ["clap-parse"] }
 color-eyre = "0.6.3"
+diesel = { version = "2.1.5", features = ["sqlite", "chrono"] }
+diesel_migrations = { version = "2.1.0", features = ["sqlite"] }
+ed25519-dalek = { version = "2.1.1", features = ["rand_core", "serde"] }
 env_logger = "0.11.3"
 eyre = "0.6.12"
 futures = "0.3.30"
@@ -21,6 +27,24 @@ openidconnect = "3.5.0"
 reqwest = "0.11.27"
 serde = { version = "1.0.197", features = ["derive"] }
 serde_json = "1.0.115"
+serde_urlencoded = "0.7.1"
+serde_with = { version = "3.7.0", features = ["base64"] }
 tinytemplate = "1.2.1"
 tokio = { version = "1.37.0", features = ["macros", "rt-multi-thread"] }
 toml = { version = "0.8.12", features = ["preserve_order"] }
+
+[build-dependencies]
+regex = "1.10.4"
+
+[package.metadata.deb]
+depends = ["$auto", "adduser (>= 3.11)"]
+assets = [
+    ["target/release/subscribe-list", "usr/bin/", "755"],
+    ["config.toml.sample", "usr/share/subscribe-list/config.toml.sample", "644"],
+]
+maintainer-scripts = "debian"
+
+[package.metadata.deb.systemd-units]
+unit-name = "subscribe-list"
+unit-scripts = "."
+enable = false

LICENSE.md

@@ -0,0 +1,675 @@
+# GNU GENERAL PUBLIC LICENSE
+
+Version 3, 29 June 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 General Public License is a free, copyleft license for
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+The licenses for most software and other practical works are designed
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+Nothing in this License shall be construed as excluding or limiting
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+
+### 12. No Surrender of Others' Freedom.
+
+If conditions are imposed on you (whether by court order, agreement or
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+from conveying the Program.
+
+### 13. Use with the GNU Affero General Public License.
+
+Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work. The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+### 14. Revised Versions of this License.
+
+The Free Software Foundation may publish revised and/or new versions
+of the GNU General Public License from time to time. Such new versions
+will be similar in spirit to the present version, but may differ in
+detail to address new problems or concerns.
+
+Each version is given a distinguishing version number. If the Program
+specifies that a certain numbered version of the GNU General Public
+License "or any later version" applies to it, you have the option of
+following the terms and conditions either of that numbered version or
+of any later version published by the Free Software Foundation. If the
+Program does not specify a version number of the GNU General Public
+License, you may choose any version ever published by the Free
+Software Foundation.
+
+If the Program specifies that a proxy can decide which future versions
+of the GNU General Public License can be used, that proxy's public
+statement of acceptance of a version permanently authorizes you to
+choose that version for the Program.
+
+Later license versions may give you additional or different
+permissions. However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+### 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 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 General Public License for more details.
+
+        You should have received a copy of the GNU 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 the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+        <program>  Copyright (C) <year>  <name of author>
+        This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+        This is free software, and you are welcome to redistribute it
+        under certain conditions; type `show c' for details.
+
+The hypothetical commands \`show w' and \`show c' should show the
+appropriate parts of the General Public License. Of course, your
+program's commands might be different; for a GUI interface, you would
+use an "about box".
+
+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 GPL, see <https://www.gnu.org/licenses/>.
+
+The GNU General Public License does not permit incorporating your
+program into proprietary programs. If your program is a subroutine
+library, you may consider it more useful to permit linking proprietary
+applications with the library. If this is what you want to do, use the
+GNU Lesser General Public License instead of this License. But first,
+please read <https://www.gnu.org/licenses/why-not-lgpl.html>.

build.rs

@@ -0,0 +1,79 @@
+use regex::Regex;
+use std::{collections::HashSet, env, error::Error, fs, path::Path, process::Command};
+
+fn escape_template(v: &str) -> Result<String, String> {
+    let cant_escape = "\\{";
+    if v.contains(cant_escape) {
+        return Err(format!("can't escape {cant_escape}"));
+    }
+    Ok(v.replace("{", "\\{"))
+}
+
+fn main() -> Result<(), Box<dyn Error>> {
+    println!("cargo:rerun-if-changed=migrations");
+    println!("cargo:rerun-if-changed=website");
+    let out_dir = env::var_os("OUT_DIR").unwrap();
+    let website_dir = Path::new(&out_dir).join("website");
+    let templates_dir = Path::new(&out_dir).join("templates");
+    fs::create_dir_all(&templates_dir)?;
+    let status = Command::new("mdbook")
+        .arg("build")
+        .arg("--dest-dir")
+        .arg(&website_dir)
+        .current_dir("website")
+        .status()
+        .map_err(|e| format!("Can't run mdbook: {e}"))?;
+    if !status.success() {
+        return Err(format!("mdbook exited with an error: {status:?}").into());
+    }
+    let sub_template_path = website_dir.join("subscription/index.html");
+    let sub_template = fs::read_to_string(&sub_template_path)
+        .map_err(|e| format!("Error reading {}: {e}", sub_template_path.display()))?;
+    let regex = Regex::new(r#"(?s)<div class="subscribe_list_template_section" id="(?<id>[^"]*)"/>(?<template>.*?)<div class="subscribe_list_template_section"/>"#).unwrap();
+    let matches = Vec::from_iter(regex.captures_iter(&sub_template));
+    let mut between_matches = vec![];
+    let mut last_end = 0;
+    for m in &matches {
+        let m = m.get(0).unwrap();
+        between_matches.push(&sub_template[last_end..m.start()]);
+        last_end = m.end();
+    }
+    between_matches.push(&sub_template[last_end..]);
+    let prefix = between_matches.remove(0);
+    let Some(suffix) = between_matches.pop() else {
+        return Err(format!(
+            "no subscribe_list_template_section `div`s found: {}",
+            sub_template_path.display()
+        )
+        .into());
+    };
+    let prefix = escape_template(prefix)?;
+    let suffix = escape_template(suffix)?;
+    for i in between_matches {
+        if i.trim_start() != "" {
+            return Err(format!(
+                r#"can't have non-whitespace text between
+<div class="subscribe_list_template_section"/>
+and next
+<div class="subscribe_list_template_section" id="..">"#
+            )
+            .into());
+        }
+    }
+    let mut identifiers = HashSet::new();
+    for m in &matches {
+        let id = &m["id"];
+        if id.contains(|ch: char| !ch.is_ascii_alphanumeric() && ch != '_') {
+            return Err(format!("invalid identifier {id:?}").into());
+        }
+        if !identifiers.insert(id) {
+            return Err(format!("duplicate identifier {id:?}").into());
+        }
+        let template = &m["template"];
+        fs::write(
+            templates_dir.join(format!("{id}.txt")),
+            prefix.clone() + template + &suffix,
+        )?;
+    }
+    Ok(())
+}

config.toml.sample

@@ -1,3 +1,6 @@
+sqlite_db = "/var/lib/subscribe-list/list.db"
+server_base_url = "https://my-site/"
+
 [oidc.google]
 pretty_name = "Google"
 issuer_url = "https://accounts.google.com"
@@ -12,4 +15,4 @@ issuer_url = "https://salsa.debian.org"
 client_id = "<TODO>"
 secret = "<TODO>"
 redirect_url = "https://my-site/subscription/callback/debian-salsa"
-scopes = ["email"]
+scopes = ["email", "openid"]

debian/postinst

@@ -0,0 +1,42 @@
+#!/bin/sh
+set -e
+
+case "$1" in
+    configure)
+        if ! getent group | grep -q "^www-data:"; then
+            echo -n "Adding group www-data.."
+            addgroup --quiet --system www-data 2>/dev/null || true
+            echo ".done"
+        fi
+        test -d /var/www || mkdir /var/www
+        if ! getent passwd | grep -q "^www-data:"; then
+            echo -n "Adding system user www-data.."
+            adduser --quiet --system --ingroup www-data --no-create-home --disabled-password www-data 2>/dev/null || true
+            echo ".done"
+        fi
+        usermod -c www-data -d /var/www -g www-data www-data
+        if ! test -d /var/lib/subscribe-list/; then
+            mkdir -m 750 /var/lib/subscribe-list/
+            touch /var/lib/subscribe-list/list.db
+            chmod 640 /var/lib/subscribe-list/list.db
+            chown -R www-data:www-data /var/lib/subscribe-list/
+        fi
+        if ! test -d /etc/subscribe-list/; then
+            mkdir -m 750 /etc/subscribe-list/
+            install -m 640 /usr/share/subscribe-list/config.toml.sample /etc/subscribe-list/config.toml
+            chown -R root:www-data /etc/subscribe-list/
+        fi
+        ;;
+
+    abort-upgrade|abort-remove|abort-deconfigure)
+        ;;
+
+    *)
+        echo "postinst called with unknown argument \`$1'" >&2
+        exit 1
+        ;;
+esac
+
+#DEBHELPER#
+
+exit 0

diesel.toml

@@ -0,0 +1,9 @@
+# For documentation on how to configure this file,
+# see https://diesel.rs/guides/configuring-diesel-cli
+
+[print_schema]
+file = "src/schema.rs"
+custom_type_derives = ["diesel::query_builder::QueryId"]
+
+[migrations_directory]
+dir = "migrations"

migrations/2024-04-08-223926_create_accounts/down.sql

@@ -0,0 +1 @@
+DROP TABLE "accounts"

migrations/2024-04-08-223926_create_accounts/up.sql

@@ -0,0 +1,4 @@
+CREATE TABLE "accounts" (
+    "email" TEXT NOT NULL PRIMARY KEY ASC,
+    "date" TIMESTAMP NOT NULL
+) WITHOUT ROWID;

migrations/2024-04-09-022737_add-email-unsubscribe-url-key/down.sql

@@ -0,0 +1 @@
+DROP TABLE "keys";

migrations/2024-04-09-022737_add-email-unsubscribe-url-key/up.sql

@@ -0,0 +1,4 @@
+CREATE TABLE "keys" (
+    "id" INTEGER PRIMARY KEY CHECK ("id" = 0) NOT NULL DEFAULT 0,
+    "email-unsubscribe-url" BLOB NOT NULL
+) WITHOUT ROWID;

src/app.rs

@@ -1,19 +1,24 @@
 use crate::{
     client::async_http_client,
-    config::{Config, OIDCProvider},
+    config::Config,
+    db::DbThread,
+    keys::Signed,
+    models::{Account, Keys},
 };
 use actix_session::Session;
 use actix_web::{
     get,
     http::header::{ContentType, LOCATION},
+    routes,
     web::{self, ServiceConfig},
     HttpResponse, Responder,
 };
-use eyre::{ensure, Context, OptionExt};
+use eyre::{ensure, OptionExt};
 use openidconnect::{
     core::{CoreAuthenticationFlow, CoreUserInfoClaims},
-    AuthorizationCode, CsrfToken, EndUserEmail, Nonce, OAuth2TokenResponse,
+    AuthorizationCode, CsrfToken, EndUserEmail, Nonce, OAuth2TokenResponse, TokenResponse,
 };
+use reqwest::Url;
 use serde::{Deserialize, Serialize};
 use std::marker::PhantomData;
 use tinytemplate::TinyTemplate;
@@ -47,7 +52,7 @@ impl<T: Template> DynTemplate for PhantomData<T> {
 macro_rules! templates {
     (
         $(
-            #[text = $text:literal]
+            #[text = $text:expr]
             $(#[$meta:meta])*
             $vis:vis struct $name:ident $fields:tt
         )*
@@ -72,26 +77,24 @@ pub struct SubscriptionLoggedOutTemplateProviders {
 }
 
 templates! {
-    #[text = r#"<head><title>Subscription</title></head>
-<body>
-<ul>
-{{- for provider in providers -}}
-<li><a href="{provider.url}">{provider.pretty_name}</a></li>
-{{- endfor -}}
-</ul>
-</body>"#]
+    #[text = include_str!(concat!(env!("OUT_DIR"), "/templates/SubscriptionLoggedOut.txt"))]
     #[derive(Debug, Serialize)]
     pub struct SubscriptionLoggedOutTemplate {
         pub providers: Vec<SubscriptionLoggedOutTemplateProviders>,
     }
-    #[text = r#"<head><title>Subscription</title></head>
-<body>
-<p>Logged in as {email}</p>
-</body>"#]
+    #[text = include_str!(concat!(env!("OUT_DIR"), "/templates/SubscriptionLoggedIn.txt"))]
     #[derive(Debug, Serialize)]
     pub struct SubscriptionLoggedInTemplate {
         pub email: EndUserEmail,
     }
+    #[text = r#"<head><title>Subscription</title></head>
+<body>
+<p>Bad Signature.</p>
+<hr/>
+<a href="/subscription">Register or Sign In</a>
+</body>"#]
+    #[derive(Debug, Serialize)]
+    pub struct SubscriptionBadSignature {}
 }
 
 pub fn make_templates() -> TinyTemplate<'static> {
@@ -129,7 +132,44 @@ impl SessionState {
     }
 }
 
-impl OIDCProvider {}
+pub async fn get_or_insert_account(
+    email: EndUserEmail,
+    session: &Session,
+    db: web::Data<DbThread>,
+) -> SessionState {
+    let state = SessionState {
+        email: email.clone(),
+    };
+    db.run_on(move |connection| {
+        use crate::schema::accounts::dsl::accounts;
+        use diesel::prelude::*;
+        let account = Account {
+            email: email.to_string(),
+            date: chrono::Utc::now().naive_utc(),
+        };
+        match diesel::insert_into(accounts)
+            .values(&account)
+            .on_conflict_do_nothing()
+            .execute(connection)
+        {
+            Ok(0) => {
+                log::debug!("found existing account: {}", account.email.as_str());
+            }
+            Ok(_) => {
+                log::info!("created new account: {}", account.email.as_str());
+            }
+            Err(e) => {
+                log::error!(
+                    "failed to get/insert account: {}\n{e}",
+                    account.email.as_str()
+                )
+            }
+        }
+    })
+    .await;
+    state.set(session);
+    state
+}
 
 const NONCE: &'static str = "nonce";
 const CSRF_TOKEN: &'static str = "csrf_token";
@@ -146,6 +186,7 @@ pub async fn callback(
     session: Session,
     path: web::Path<(String,)>,
     query: web::Query<AuthQuery>,
+    db: web::Data<DbThread>,
 ) -> impl Responder {
     let mut resp = HttpResponse::SeeOther().body("");
     resp.headers_mut()
@@ -155,15 +196,15 @@ pub async fn callback(
     }
     let body = async {
         let csrf_token = session
-            .get::<CsrfToken>(CSRF_TOKEN)
-            .context("invalid csrf token")?
-            .ok_or_eyre("missing csrf token")?;
+            .remove_as::<CsrfToken>(CSRF_TOKEN)
+            .ok_or_eyre("missing csrf token")?
+            .ok()
+            .ok_or_eyre("invalid csrf token")?;
         let nonce = session
-            .get::<Nonce>(NONCE)
-            .context("invalid nonce")?
-            .ok_or_eyre("missing nonce")?;
-        session.remove(CSRF_TOKEN);
-        session.remove(NONCE);
+            .remove_as::<Nonce>(NONCE)
+            .ok_or_eyre("missing nonce")?
+            .ok()
+            .ok_or_eyre("invalid nonce")?;
         ensure!(
             csrf_token.secret() == query.state.secret(),
             "csrf token doesn't match"
@@ -175,6 +216,14 @@ pub async fn callback(
             .exchange_code(query.into_inner().code)
             .request_async(async_http_client)
             .await?;
+        if let Some(id_token) = token.id_token() {
+            let id_token_claims =
+                id_token.claims(&provider.state().client.id_token_verifier(), &nonce)?;
+            if let Some(email) = id_token_claims.email().cloned() {
+                get_or_insert_account(email, &session, db).await;
+                return Ok(());
+            }
+        }
         let user_info: CoreUserInfoClaims = provider
             .state()
             .client
@@ -182,7 +231,7 @@ pub async fn callback(
             .request_async(async_http_client)
             .await?;
         let email = user_info.email().ok_or_eyre("no email provided")?.clone();
-        SessionState { email }.set(&session);
+        get_or_insert_account(email, &session, db).await;
         Ok(())
     };
     let result: eyre::Result<()> = body.await;
@@ -224,10 +273,93 @@ pub async fn login(
     resp
 }
 
+#[derive(Serialize, Deserialize)]
+#[serde(transparent)]
+pub struct EmailUnsubscribeUrlQueryParams {
+    pub signed_email: Signed<EndUserEmail, ed25519_dalek::Signature>,
+}
+
+impl EmailUnsubscribeUrlQueryParams {
+    pub fn new(email: &EndUserEmail, keys: &Keys) -> Self {
+        Self {
+            signed_email: Signed::sign(email, keys.email_unsubscribe_url.secret()).unwrap(),
+        }
+    }
+    pub fn make_url(&self, config: &Config) -> Url {
+        let mut retval = config.server_base_url.join("/subscription/email").unwrap();
+        retval.set_query(Some(&serde_urlencoded::to_string(&self).unwrap()));
+        retval
+    }
+}
+
+#[get("/subscription/email")]
+pub async fn email_unsubscribe(
+    keys: web::Data<Keys>,
+    session: Session,
+    query: web::Query<EmailUnsubscribeUrlQueryParams>,
+) -> impl Responder {
+    let Ok(Ok(email)) = query
+        .signed_email
+        .verify(keys.email_unsubscribe_url.secret())
+    else {
+        return HttpResponse::Forbidden()
+            .content_type(ContentType::html())
+            .body(SubscriptionBadSignature {}.render().unwrap());
+    };
+    SessionState { email }.set(&session);
+    let mut resp = HttpResponse::SeeOther().body("");
+    resp.headers_mut()
+        .insert(LOCATION, "/subscription".parse().unwrap());
+    resp
+}
+
+#[get("/subscription/logout")]
+pub async fn logout(session: Session) -> impl Responder {
+    session.purge();
+    let mut resp = HttpResponse::SeeOther().body("");
+    resp.headers_mut()
+        .insert(LOCATION, "/subscription".parse().unwrap());
+    resp
+}
+
+#[get("/subscription/unsubscribe")]
+pub async fn unsubscribe(session: Session, db: web::Data<DbThread>) -> impl Responder {
+    if let Some(state) = SessionState::get(&session) {
+        db.run_on(move |connection| {
+            use crate::schema::accounts::dsl::*;
+            use diesel::prelude::*;
+            match diesel::delete(accounts.filter(email.eq(state.email.as_str())))
+                .execute(connection)
+            {
+                Ok(_) => {
+                    log::info!("deleted account: {}", state.email.as_str());
+                }
+                Err(e) => {
+                    log::error!("failed to delete account: {}\n{e}", state.email.as_str())
+                }
+            }
+        })
+        .await;
+    }
+    session.purge();
+    let mut resp = HttpResponse::SeeOther().body("");
+    resp.headers_mut()
+        .insert(LOCATION, "/subscription".parse().unwrap());
+    resp
+}
+
+#[routes]
 #[get("/subscription")]
-pub async fn subscription(config: web::Data<Config>, session: Session) -> impl Responder {
+#[get("/subscription/")]
+#[get("/subscription/index.html")]
+pub async fn subscription(
+    config: web::Data<Config>,
+    session: Session,
+    db: web::Data<DbThread>,
+) -> impl Responder {
     if let Some(SessionState { email }) = SessionState::get(&session) {
-        let mut template = SubscriptionLoggedInTemplate { email };
+        get_or_insert_account(email.clone(), &session, db).await;
+        let template = SubscriptionLoggedInTemplate { email };
         HttpResponse::Ok()
             .content_type(ContentType::html())
             .body(template.render().expect("rendering can't fail"))
@@ -247,8 +379,20 @@ pub async fn subscription(config: web::Data<Config>, session: Session) -> impl R
     }
 }
 
+pub async fn page_not_found() -> impl Responder {
+    HttpResponse::NotFound()
+        .content_type(ContentType::html())
+        .body(include_str!(concat!(env!("OUT_DIR"), "/website/404.html")))
+}
+
 pub fn all_services(cfg: &mut ServiceConfig) {
-    cfg.service(subscription).service(login).service(callback);
+    cfg.service(subscription)
+        .service(login)
+        .service(callback)
+        .service(logout)
+        .service(unsubscribe)
+        .service(email_unsubscribe)
+        .default_service(web::to(page_not_found));
 }
 
 #[cfg(test)]

src/cli.rs

@@ -1,25 +1,52 @@
 use crate::config;
-use clap::{ArgAction, Args, Parser};
+use clap::{ArgAction, Args, Parser, Subcommand};
 use eyre::ensure;
-use futures::try_join;
+use futures::future::try_join_all;
 use listenfd::ListenFd;
-use std::{net::TcpListener, os::unix::net::UnixListener, path::PathBuf};
+
+use std::{future::Future, net::TcpListener, os::unix::net::UnixListener, path::PathBuf, pin::Pin};
 
 #[derive(Parser, Debug)]
 pub struct CLI {
-    #[arg(long, value_parser, value_name = "path/to/config.toml")]
+    #[arg(long, value_name = "path/to/config.toml")]
     pub config: config::Config,
-    #[command(flatten)]
-    pub listen: Listen,
+    #[command(subcommand)]
+    pub subcommand: CLISubcommand,
 }
 
 impl CLI {
     pub async fn resolve(&mut self, listenfd: &mut ListenFd) -> eyre::Result<()> {
-        try_join!(self.config.resolve(), self.listen.resolve(listenfd))?;
+        let mut futures: Vec<Pin<Box<dyn Future<Output = eyre::Result<()>> + Send>>> = vec![];
+        let resolve_provider_metadata;
+        match &mut self.subcommand {
+            CLISubcommand::Serve { listen } => {
+                resolve_provider_metadata = true;
+                futures.push(Box::pin(listen.resolve(listenfd)));
+            }
+            CLISubcommand::GenerateUnsubscribeUrls { emails: _ } => {
+                resolve_provider_metadata = false;
+            }
+        }
+        futures.push(Box::pin(self.config.resolve(resolve_provider_metadata)));
+        try_join_all(futures).await?;
+        if resolve_provider_metadata {
+            log::info!("retrieved config from auth servers");
+        }
         Ok(())
     }
 }
 
+#[derive(Subcommand, Debug)]
+pub enum CLISubcommand {
+    Serve {
+        #[command(flatten)]
+        listen: Listen,
+    },
+    GenerateUnsubscribeUrls {
+        emails: Vec<String>,
+    },
+}
+
 #[derive(Args, Debug)]
 #[group(required = true)]
 pub struct Listen {

src/config.rs

@@ -1,45 +1,71 @@
 use crate::client::async_http_client;
 use clap::builder::{TryMapValueParser, TypedValueParser, ValueParserFactory};
 use clio::CachedInput;
-use eyre::Context;
+use eyre::{ensure, Context, OptionExt};
 use futures::future::try_join_all;
 use indexmap::IndexMap;
 use openidconnect::{
     core::{CoreClient, CoreProviderMetadata},
     ClientId, ClientSecret, IssuerUrl, RedirectUrl, Scope,
 };
+use reqwest::Url;
 use serde::{Deserialize, Serialize};
+use std::num::NonZeroU16;
+
+pub fn default_db_thread_channel_capacity() -> NonZeroU16 {
+    NonZeroU16::new(10).unwrap()
+}
 
 #[derive(Deserialize, Serialize, Debug, Clone)]
 pub struct Config {
+    pub sqlite_db: String,
+    #[serde(default = "default_db_thread_channel_capacity")]
+    pub db_thread_channel_capacity: NonZeroU16,
+    pub server_base_url: Url,
     pub oidc: IndexMap<String, OIDCProvider>,
 }
 
 impl ValueParserFactory for Config {
     type Parser = TryMapValueParser<
         <CachedInput as ValueParserFactory>::Parser,
-        fn(CachedInput) -> eyre::Result<Config>,
+        fn(CachedInput) -> Result<Config, String>,
     >;
 
     fn value_parser() -> Self::Parser {
-        CachedInput::value_parser().try_map(Config::load)
+        CachedInput::value_parser().try_map(|v| Config::load(&v).map_err(|e| format!("{e:#}")))
     }
 }
 
 impl Config {
+    #[allow(dead_code)]
     pub const EXAMPLE: &'static str =
         include_str!(concat!(env!("CARGO_MANIFEST_DIR"), "/config.toml.sample"));
     pub fn load_str(input: &str, path: impl ToString) -> eyre::Result<Config> {
         toml::from_str(input).wrap_err_with(|| path.to_string())
     }
 
-    pub fn load(input: CachedInput) -> eyre::Result<Config> {
+    pub fn load(input: &CachedInput) -> eyre::Result<Config> {
+        log::debug!("loading config from: {}", input.path());
         let s = std::str::from_utf8(input.get_data()).wrap_err_with(|| input.path().to_string())?;
-        toml::from_str(s).wrap_err_with(|| input.path().to_string())
+        Self::load_str(s, input.path())
     }
 
-    pub async fn resolve(&mut self) -> eyre::Result<()> {
-        try_join_all(self.oidc.iter_mut().map(|(_, provider)| provider.resolve())).await?;
+    pub async fn resolve(&mut self, resolve_provider_metadata: bool) -> eyre::Result<()> {
+        let expected_server_base_url: Url = self
+            .server_base_url
+            .origin()
+            .ascii_serialization()
+            .parse()
+            .ok()
+            .ok_or_eyre("invalid server_base_url")?;
+        ensure!(
+            self.server_base_url == expected_server_base_url,
+            "invalid server_base_url -- expected {expected_server_base_url}"
+        );
+        try_join_all(self.oidc.iter_mut().map(|(name, provider)| {
+            provider.resolve(name, resolve_provider_metadata, &self.server_base_url)
+        }))
+        .await?;
         Ok(())
     }
 }
@@ -66,7 +92,19 @@ impl OIDCProvider {
     pub fn state(&self) -> &OIDCProviderState {
         self.state.as_ref().expect("resolve called by main")
     }
-    pub async fn resolve(&mut self) -> eyre::Result<()> {
+    pub async fn resolve(
+        &mut self,
+        name: &str,
+        resolve_provider_metadata: bool,
+        server_base_url: &Url,
+    ) -> eyre::Result<()> {
+        let expected_redirect_url =
+            server_base_url.join(&format!("/subscription/callback/{name}"))?;
+        ensure!(
+            self.redirect_url.as_str() == expected_redirect_url.as_str(),
+            "oidc.{name:?}.redirect_url should be {expected_redirect_url}"
+        );
+        if resolve_provider_metadata {
             let provider_metadata =
                 CoreProviderMetadata::discover_async(self.issuer_url.clone(), async_http_client)
                     .await?;
@@ -81,6 +119,7 @@ impl OIDCProvider {
                 client,
                 provider_metadata,
             });
+        }
         Ok(())
     }
 }

src/db.rs

@@ -0,0 +1,56 @@
+use tokio::sync::{mpsc, oneshot};
+
+struct DbThreadInner {
+    op_sender: mpsc::Sender<Box<dyn FnOnce(&mut diesel::SqliteConnection) + Send>>,
+    join_handle: std::thread::JoinHandle<()>,
+}
+
+pub struct DbThread(Option<DbThreadInner>);
+
+impl DbThread {
+    pub fn new(mut connection: diesel::SqliteConnection, buffer: usize) -> Self {
+        let (op_sender, mut op_receiver) =
+            mpsc::channel::<Box<dyn FnOnce(&mut diesel::SqliteConnection) + Send>>(buffer);
+        let join_handle = std::thread::spawn(move || loop {
+            let Some(f) = op_receiver.blocking_recv() else {
+                break;
+            };
+            f(&mut connection);
+        });
+        Self(Some(DbThreadInner {
+            op_sender,
+            join_handle,
+        }))
+    }
+    pub async fn run_on<
+        F: FnOnce(&mut diesel::SqliteConnection) -> T + Send + 'static,
+        T: Send + 'static,
+    >(
+        &self,
+        f: F,
+    ) -> T {
+        let (result_sender, result_receiver) = oneshot::channel();
+        self.0
+            .as_ref()
+            .unwrap()
+            .op_sender
+            .send(Box::new(move |connection| {
+                // if send failed, the future must have been canceled, so ignore send failures
+                let _ = result_sender.send(f(connection));
+            }))
+            .await
+            .expect("send to succeed");
+        result_receiver.await.expect("result to be written")
+    }
+}
+
+impl Drop for DbThread {
+    fn drop(&mut self) {
+        let DbThreadInner {
+            op_sender,
+            join_handle,
+        } = self.0.take().unwrap();
+        drop(op_sender);
+        join_handle.join().unwrap();
+    }
+}

src/keys.rs

@@ -0,0 +1,139 @@
+use crate::models::{Keys, OnlyZero};
+use core::fmt;
+use diesel::{
+    expression::TypedExpressionType, sql_types::SqlType, Connection, RunQueryDsl, SqliteConnection,
+};
+use ed25519_dalek::{
+    ed25519::{signature::rand_core::OsRng, SignatureEncoding},
+    SignatureError, Signer, Verifier,
+};
+use serde::{de::DeserializeOwned, Deserialize, Serialize};
+use serde_with::{
+    base64::{Base64, UrlSafe},
+    formats::Unpadded,
+    serde_as,
+};
+use std::marker::PhantomData;
+
+#[derive(Copy, Clone)]
+pub struct Key<T>(T);
+
+impl<T> fmt::Debug for Key<T> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "Key([redacted])")
+    }
+}
+
+impl<T> Key<T> {
+    pub fn new(v: T) -> Self {
+        Self(v)
+    }
+    pub fn secret(&self) -> &T {
+        &self.0
+    }
+}
+
+impl<ST, DB: diesel::backend::Backend> diesel::Queryable<ST, DB> for Key<ed25519_dalek::SigningKey>
+where
+    Vec<u8>: diesel::Queryable<ST, DB>,
+{
+    type Row = <Vec<u8> as diesel::Queryable<ST, DB>>::Row;
+
+    fn build(row: Self::Row) -> diesel::deserialize::Result<Self> {
+        let v = <Vec<u8> as diesel::Queryable<ST, DB>>::build(row)?;
+        Ok(Key(ed25519_dalek::SigningKey::try_from(&*v)?))
+    }
+}
+
+impl<T: SqlType + TypedExpressionType> diesel::expression::AsExpression<T>
+    for Key<ed25519_dalek::SigningKey>
+where
+    Vec<u8>: diesel::expression::AsExpression<T>,
+{
+    type Expression = <Vec<u8> as diesel::expression::AsExpression<T>>::Expression;
+
+    fn as_expression(self) -> Self::Expression {
+        Vec::<u8>::from(self.0.to_bytes()).as_expression()
+    }
+}
+
+impl<'a, T: SqlType + TypedExpressionType> diesel::expression::AsExpression<T>
+    for &'a Key<ed25519_dalek::SigningKey>
+where
+    &'a [u8]: diesel::expression::AsExpression<T>,
+{
+    type Expression = <&'a [u8] as diesel::expression::AsExpression<T>>::Expression;
+
+    fn as_expression(self) -> Self::Expression {
+        self.0.as_bytes()[..].as_expression()
+    }
+}
+
+impl<'a, T: SqlType + TypedExpressionType> diesel::expression::AsExpression<T>
+    for &'a &'_ Key<ed25519_dalek::SigningKey>
+where
+    &'a [u8]: diesel::expression::AsExpression<T>,
+{
+    type Expression = <&'a [u8] as diesel::expression::AsExpression<T>>::Expression;
+
+    fn as_expression(self) -> Self::Expression {
+        self.0.as_bytes()[..].as_expression()
+    }
+}
+
+pub fn get_or_make_keys(db: &mut SqliteConnection) -> eyre::Result<Keys> {
+    db.transaction(|db| -> eyre::Result<Keys> {
+        let keys: Option<Keys> = crate::schema::keys::dsl::keys.load(db)?.get(0).cloned();
+        if let Some(keys) = keys {
+            return Ok(keys);
+        }
+        let keys = Keys {
+            id: OnlyZero::Zero,
+            email_unsubscribe_url: Key::new(ed25519_dalek::SigningKey::generate(&mut OsRng)),
+        };
+        diesel::insert_into(crate::schema::keys::dsl::keys)
+            .values(keys.clone())
+            .execute(db)?;
+        Ok(keys)
+    })
+}
+
+#[serde_as]
+#[derive(Serialize, Deserialize)]
+pub struct Signed<T, S: SignatureEncoding> {
+    #[serde(rename = "v")]
+    value: String,
+    #[serde(rename = "s", bound(deserialize = "S::Repr: TryFrom<Vec<u8>>"))]
+    #[serde_as(as = "Base64<UrlSafe, Unpadded>")]
+    signature: S::Repr,
+    #[serde(skip)]
+    _phantom: PhantomData<(fn() -> T, S)>,
+}
+
+impl<T: Serialize + DeserializeOwned, S: SignatureEncoding> Signed<T, S> {
+    pub fn sign<K>(value: &T, key: &K) -> Result<Self, serde_json::Error>
+    where
+        K: Signer<S>,
+    {
+        let value = serde_json::to_string(value)?;
+        let signature = key.sign(value.as_bytes()).to_bytes();
+        Ok(Self {
+            value,
+            signature,
+            _phantom: PhantomData,
+        })
+    }
+    pub fn verify<K>(&self, key: &K) -> eyre::Result<Result<T, SignatureError>>
+    where
+        K: Verifier<S>,
+        for<'a> eyre::Report: From<<S as TryFrom<&'a [u8]>>::Error>,
+    {
+        if let Err(e) = key.verify(
+            &self.value.as_bytes(),
+            &S::try_from(self.signature.as_ref())?,
+        ) {
+            return Ok(Err(e));
+        }
+        Ok(Ok(serde_json::from_str(&self.value)?))
+    }
+}

src/lib.rs

@@ -1,22 +1,38 @@
-use crate::cli::{Listen, ListenFdSocket, ListenFdSockets};
+use crate::{
+    app::EmailUnsubscribeUrlQueryParams,
+    cli::{CLISubcommand, Listen, ListenFdSocket, ListenFdSockets},
+    config::Config,
+    db::DbThread,
+    keys::get_or_make_keys,
+    models::Keys,
+};
 use actix_session::{storage::CookieSessionStore, SessionMiddleware};
 use actix_web::{cookie::Key, web, App, HttpServer};
 use clap::Parser;
+use diesel::Connection;
+use diesel_migrations::{embed_migrations, EmbeddedMigrations, MigrationHarness};
+use eyre::eyre;
 use listenfd::ListenFd;
+use openidconnect::EndUserEmail;
+
+pub const MIGRATIONS: EmbeddedMigrations = embed_migrations!();
 
 mod app;
 mod cli;
 mod client;
 mod config;
+mod db;
+mod keys;
+mod models;
+mod schema;
 
-pub async fn main() -> eyre::Result<()> {
-    env_logger::init();
-    let mut listenfd = ListenFd::from_env();
-    color_eyre::install()?;
-    let mut args = cli::CLI::parse();
-    args.resolve(&mut listenfd).await?;
-    log::info!("retrieved config from auth servers");
-    let config = web::Data::new(args.config);
+pub async fn run_server(
+    config: Config,
+    db: web::Data<DbThread>,
+    keys: web::Data<Keys>,
+    listen: Listen,
+) -> eyre::Result<()> {
+    let config = web::Data::new(config);
     let cookie_session_key = Key::generate();
     let mut server = HttpServer::new(move || {
         let cookie_session =
@@ -26,13 +42,15 @@ pub async fn main() -> eyre::Result<()> {
         App::new()
             .wrap(cookie_session)
             .app_data(config.clone())
+            .app_data(db.clone())
+            .app_data(keys.clone())
             .configure(app::all_services)
     });
     let Listen {
         listen_tcp,
         listen_unix,
         listen_fd,
-    } = &mut args.listen;
+    } = listen;
     for sock in listen_tcp.iter() {
         server = server.bind_auto_h2c(sock)?;
     }
@@ -40,7 +58,7 @@ pub async fn main() -> eyre::Result<()> {
         server = server.bind_uds(sock)?;
     }
     if let Some(ListenFdSockets(sockets)) = listen_fd {
-        for sock in sockets.drain(..) {
+        for sock in sockets.into_iter() {
             server = match sock {
                 ListenFdSocket::Tcp(sock) => server.listen_auto_h2c(sock)?,
                 ListenFdSocket::Unix(sock) => server.listen_uds(sock)?,
@@ -51,3 +69,38 @@ pub async fn main() -> eyre::Result<()> {
     server.run().await?;
     Ok(())
 }
+
+pub async fn generate_unsubscribe_urls(
+    config: Config,
+    keys: web::Data<Keys>,
+    emails: Vec<String>,
+) -> eyre::Result<()> {
+    for email in emails {
+        let email = EndUserEmail::new(email);
+        let url = EmailUnsubscribeUrlQueryParams::new(&email, &keys).make_url(&config);
+        println!("{url}");
+    }
+    Ok(())
+}
+
+pub async fn main() -> eyre::Result<()> {
+    env_logger::init();
+    let mut listenfd = ListenFd::from_env();
+    color_eyre::install()?;
+    let mut cli = cli::CLI::parse();
+    let mut db = diesel::SqliteConnection::establish(&cli.config.sqlite_db)?;
+    db.run_pending_migrations(MIGRATIONS)
+        .map_err(|e| eyre!(e))?;
+    let keys = web::Data::new(get_or_make_keys(&mut db)?);
+    let db = web::Data::new(DbThread::new(
+        db,
+        cli.config.db_thread_channel_capacity.get().into(),
+    ));
+    cli.resolve(&mut listenfd).await?;
+    match cli.subcommand {
+        CLISubcommand::Serve { listen } => run_server(cli.config, db, keys, listen).await,
+        CLISubcommand::GenerateUnsubscribeUrls { emails } => {
+            generate_unsubscribe_urls(cli.config, keys, emails).await
+        }
+    }
+}

src/models.rs

@@ -0,0 +1,43 @@
+use crate::keys::Key;
+use chrono::NaiveDateTime;
+use diesel::prelude::*;
+use eyre::ensure;
+
+#[derive(Queryable, Selectable, Insertable)]
+#[diesel(table_name = crate::schema::accounts)]
+#[diesel(check_for_backend(diesel::sqlite::Sqlite))]
+pub struct Account {
+    pub email: String,
+    pub date: NaiveDateTime,
+}
+
+#[derive(Copy, Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub enum OnlyZero {
+    #[default]
+    Zero = 0,
+}
+
+impl From<OnlyZero> for i32 {
+    fn from(_value: OnlyZero) -> Self {
+        0
+    }
+}
+
+impl TryFrom<i32> for OnlyZero {
+    type Error = eyre::Report;
+
+    fn try_from(value: i32) -> Result<Self, Self::Error> {
+        ensure!(value == 0, "tried to convert nonzero value into OnlyZero");
+        Ok(OnlyZero::Zero)
+    }
+}
+
+#[derive(Queryable, Selectable, Insertable, Clone)]
+#[diesel(table_name = crate::schema::keys)]
+#[diesel(check_for_backend(diesel::sqlite::Sqlite))]
+pub struct Keys {
+    #[diesel(serialize_as = i32)]
+    #[diesel(deserialize_as = i32)]
+    pub id: OnlyZero,
+    pub email_unsubscribe_url: Key<ed25519_dalek::SigningKey>,
+}

src/schema.rs

@@ -0,0 +1,21 @@
+// @generated automatically by Diesel CLI.
+
+diesel::table! {
+    accounts (email) {
+        email -> Text,
+        date -> Timestamp,
+    }
+}
+
+diesel::table! {
+    keys (id) {
+        id -> Integer,
+        #[sql_name = "email-unsubscribe-url"]
+        email_unsubscribe_url -> Binary,
+    }
+}
+
+diesel::allow_tables_to_appear_in_same_query!(
+    accounts,
+    keys,
+);

subscribe-list.service

@@ -0,0 +1,14 @@
+[Unit]
+Description=web server for managing subscriptions
+Requires=subscribe-list.socket
+
+[Service]
+Environment=RUST_LOG=info
+Type=exec
+ExecStartPre=test -f /var/lib/subscribe-list/list.db
+ExecStart=/usr/bin/subscribe-list --config /etc/subscribe-list/config.toml serve --listen-fd
+User=www-data
+Group=www-data
+
+[Install]
+Also=subscribe-list.socket

subscribe-list.socket

@@ -0,0 +1,8 @@
+[Unit]
+Description=subscribe-list socket
+
+[Socket]
+ListenStream=/run/subscribe-list.socket
+
+[Install]
+WantedBy=sockets.target

website

@@ -0,0 +1 @@
+Subproject commit bfa8bd253cb9ba1bcc1358891767f8c2411a63fe