Allow updating of custom_domain

thanks, @fdb-hiroshima

Co-Authored-By: fdb-hiroshima <35889323+fdb-hiroshima@users.noreply.github.com>

Cargo.lock

@@ -1973,6 +1973,7 @@ dependencies = [
  "plume-api 0.3.0",
  "plume-common 0.3.0",
  "plume-models 0.3.0",
+ "reqwest 0.9.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "rocket 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rocket_contrib 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rocket_csrf 0.1.0 (git+https://github.com/fdb-hiroshima/rocket_csrf?rev=4a72ea2ec716cb0b26188fb00bccf2ef7d1e031c)",

Cargo.toml

@@ -19,6 +19,7 @@ heck = "0.3.0"
 lettre = { git = "https://github.com/lettre/lettre", rev = "c988b1760ad8179d9e7f3fb8594d2b86cf2a0a49" }
 lettre_email = { git = "https://github.com/lettre/lettre", rev = "c988b1760ad8179d9e7f3fb8594d2b86cf2a0a49" }
 num_cpus = "1.10"
+reqwest = "0.9"
 rocket = "0.4.0"
 rocket_contrib = { version = "0.4.0", features = ["json"] }
 rocket_i18n = { git = "https://github.com/Plume-org/rocket_i18n", rev = "e922afa7c366038b3433278c03b1456b346074f2" }

migrations/postgres/2019-05-22-124143_add_custom_domains/down.sql

@@ -0,0 +1,2 @@
+-- undo the adding of custom_domain column to blogs table.
+ALTER TABLE blogs DROP COLUMN custom_domain;

migrations/postgres/2019-05-22-124143_add_custom_domains/up.sql

@@ -0,0 +1,2 @@
+--- Adding custom domain to Blog as an optional field
+ALTER TABLE blogs ADD COLUMN custom_domain VARCHAR DEFAULT NULL UNIQUE;

migrations/sqlite/2019-05-22-124153_add_custom_domains/down.sql

@@ -0,0 +1,56 @@
+-- undo the adding of "custom_domain" to blogs
+CREATE TABLE IF NOT EXISTS "blogs_drop_custom_domain" (
+  id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+  actor_id VARCHAR NOT NULL,
+  title VARCHAR NOT NULL,
+  summary TEXT NOT NULL DEFAULT '',
+  outbox_url VARCHAR NOT NULL UNIQUE,
+  inbox_url VARCHAR NOT NULL UNIQUE,
+  instance_id INTEGER REFERENCES instances(id) ON DELETE CASCADE NOT NULL,
+  creation_date DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  ap_url text not null default '' UNIQUE,
+  private_key TEXT,
+  public_key TEXT NOT NULL DEFAULT '',
+  fqn TEXT NOT NULL DEFAULT '',
+  summary_html TEXT NOT NULL DEFAULT '',
+  icon_id INTEGER REFERENCES medias(id) ON DELETE SET NULL DEFAULT NULL,
+  banner_id INTEGER REFERENCES medias(id) ON DELETE SET NULL DEFAULT NULL,
+  CONSTRAINT blog_unique UNIQUE (actor_id, instance_id)
+);
+
+INSERT INTO blogs_drop_custom_domain (
+  id,
+  actor_id,
+  title,
+  summary,
+  outbox_url,
+  inbox_url,
+  instance_id,
+  creation_date,
+  ap_url,
+  private_key,
+  public_key,
+  fqn,
+  summary_html,
+  icon_id,
+  banner_id
+) SELECT
+  id,
+  actor_id,
+  title,
+  summary,
+  outbox_url,
+  inbox_url,
+  instance_id,
+  creation_date,
+  ap_url,
+  private_key,
+  public_key,
+  fqn,
+  summary_html,
+  icon_id,
+  banner_id
+FROM blogs;
+
+DROP TABLE blogs;
+ALTER TABLE "blogs_drop_custom_domain" RENAME to blogs;

migrations/sqlite/2019-05-22-124153_add_custom_domains/up.sql

@@ -0,0 +1,57 @@
+-- add custom_domain to blogs
+CREATE TABLE IF NOT EXISTS "blogs_add_custom_domain" (
+  id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+  actor_id VARCHAR NOT NULL,
+  title VARCHAR NOT NULL,
+  summary TEXT NOT NULL DEFAULT '',
+  outbox_url VARCHAR NOT NULL UNIQUE,
+  inbox_url VARCHAR NOT NULL UNIQUE,
+  instance_id INTEGER REFERENCES instances(id) ON DELETE CASCADE NOT NULL,
+  creation_date DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  ap_url text not null default '' UNIQUE,
+  private_key TEXT,
+  public_key TEXT NOT NULL DEFAULT '',
+  fqn TEXT NOT NULL DEFAULT '',
+  summary_html TEXT NOT NULL DEFAULT '',
+  icon_id INTEGER REFERENCES medias(id) ON DELETE SET NULL DEFAULT NULL,
+  banner_id INTEGER REFERENCES medias(id) ON DELETE SET NULL DEFAULT NULL,
+  custom_domain text default NULL UNIQUE,
+  CONSTRAINT blog_unique UNIQUE (actor_id, instance_id)
+);
+
+INSERT INTO blogs_add_custom_domain (
+  id,
+  actor_id,
+  title,
+  summary,
+  outbox_url,
+  inbox_url,
+  instance_id,
+  creation_date,
+  ap_url,
+  private_key,
+  public_key,
+  fqn,
+  summary_html,
+  icon_id,
+  banner_id
+) SELECT
+  id,
+  actor_id,
+  title,
+  summary,
+  outbox_url,
+  inbox_url,
+  instance_id,
+  creation_date,
+  ap_url,
+  private_key,
+  public_key,
+  fqn,
+  summary_html,
+  icon_id,
+  banner_id
+FROM blogs;
+
+DROP TABLE blogs;
+ALTER TABLE "blogs_add_custom_domain" RENAME to blogs;

plume-models/Cargo.toml

@@ -25,7 +25,6 @@ tantivy = "0.10.1"
 url = "2.1"
 webfinger = "0.4.1"
 whatlang = "0.7.1"
-shrinkwraprs = "0.2.1"
 diesel-derive-newtype = "0.1.2"
 
 [dependencies.chrono]

plume-models/src/blogs.rs

@@ -7,6 +7,11 @@ use openssl::{
     rsa::Rsa,
     sign::{Signer, Verifier},
 };
+use rocket::{
+    http::RawStr,
+    outcome::IntoOutcome,
+    request::{self, FromFormValue, FromRequest, Request},
+};
 use serde_json;
 use url::Url;
 use webfinger::*;
@@ -21,11 +26,70 @@ use posts::Post;
 use safe_string::SafeString;
 use schema::blogs;
 use search::Searcher;
+use std::default::Default;
+use std::fmt::{self, Display};
+use std::ops::Deref;
+use std::sync::RwLock;
 use users::User;
 use {Connection, Error, PlumeRocket, Result};
 
 pub type CustomGroup = CustomObject<ApSignature, Group>;
 
+#[derive(Clone, Debug, PartialEq, DieselNewType)]
+pub struct Host(String);
+
+impl Host {
+    pub fn new(host: impl ToString) -> Host {
+        Host(host.to_string())
+    }
+}
+
+impl Deref for Host {
+    type Target = str;
+    fn deref(&self) -> &str {
+        &self.0
+    }
+}
+
+impl Display for Host {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self.0)
+    }
+}
+
+impl AsRef<str> for Host {
+    fn as_ref(&self) -> &str {
+        &self.0
+    }
+}
+
+impl<'a, 'r> FromRequest<'a, 'r> for Host {
+    type Error = ();
+
+    fn from_request(request: &'a Request<'r>) -> request::Outcome<Host, ()> {
+        request
+            .headers()
+            .get_one("Host")
+            .and_then(|x| {
+                if Blog::list_custom_domains().contains(&x.to_string()) {
+                    Some(Host::new(x))
+                } else {
+                    None
+                }
+            })
+            .or_forward(())
+    }
+}
+
+impl<'v> FromFormValue<'v> for Host {
+    type Error = &'v RawStr;
+
+    fn from_form_value(form_value: &'v RawStr) -> std::result::Result<Host, &'v RawStr> {
+        let val = String::from_form_value(form_value)?;
+        Ok(Host::new(&val))
+    }
+}
+
 #[derive(Queryable, Identifiable, Clone, AsChangeset)]
 #[changeset_options(treat_none_as_null = "true")]
 pub struct Blog {
@@ -44,6 +108,7 @@ pub struct Blog {
     pub summary_html: SafeString,
     pub icon_id: Option<i32>,
     pub banner_id: Option<i32>,
+    pub custom_domain: Option<Host>,
 }
 
 #[derive(Default, Insertable)]
@@ -61,10 +126,15 @@ pub struct NewBlog {
     pub summary_html: SafeString,
     pub icon_id: Option<i32>,
     pub banner_id: Option<i32>,
+    pub custom_domain: Option<Host>,
 }
 
 const BLOG_PREFIX: &str = "~";
 
+lazy_static! {
+    static ref CUSTOM_DOMAINS: RwLock<Vec<String>> = RwLock::new(vec![]);
+}
+
 impl Blog {
     insert!(blogs, NewBlog, |inserted, conn| {
         let instance = inserted.get_instance(conn)?;
@@ -144,6 +214,13 @@ impl Blog {
         }
     }
 
+    pub fn find_by_host(c: &PlumeRocket, host: Host) -> Result<Blog> {
+        blogs::table
+            .filter(blogs::custom_domain.eq(host))
+            .first::<Blog>(&*c.conn)
+            .map_err(|_| Error::NotFound)
+    }
+
     fn fetch_from_webfinger(c: &PlumeRocket, acct: &str) -> Result<Blog> {
         resolve_with_prefix(Prefix::Group, acct.to_owned(), true)?
             .links
@@ -269,6 +346,19 @@ impl Blog {
         })
     }
 
+    pub fn url(&self) -> String {
+        format!(
+            "https://{}",
+            self.custom_domain
+                .clone()
+                .unwrap_or_else(|| Host::new(format!(
+                    "{}/~/{}",
+                    Instance::get_local().unwrap().public_domain,
+                    self.fqn,
+                )))
+        )
+    }
+
     pub fn icon_url(&self, conn: &Connection) -> String {
         self.icon_id
             .and_then(|id| Media::get(conn, id).and_then(|m| m.url()).ok())
@@ -290,6 +380,23 @@ impl Blog {
             .map(|_| ())
             .map_err(Error::from)
     }
+
+    pub fn list_custom_domains() -> Vec<String> {
+        CUSTOM_DOMAINS.read().unwrap().clone()
+    }
+
+    pub fn cache_custom_domains(conn: &Connection) {
+        *CUSTOM_DOMAINS.write().unwrap() = Blog::list_custom_domains_uncached(conn).unwrap();
+    }
+
+    pub fn list_custom_domains_uncached(conn: &Connection) -> Result<Vec<String>> {
+        blogs::table
+            .filter(blogs::custom_domain.is_not_null())
+            .select(blogs::custom_domain)
+            .load::<Option<String>>(conn)
+            .map_err(Error::from)
+            .map(|res| res.into_iter().map(Option::unwrap).collect::<Vec<_>>())
+    }
 }
 
 impl IntoId for Blog {
@@ -392,6 +499,7 @@ impl FromId<PlumeRocket> for Blog {
                         .summary_string()
                         .unwrap_or_default(),
                 ),
+                custom_domain: None,
             },
         )
     }
@@ -441,6 +549,7 @@ impl NewBlog {
         title: String,
         summary: String,
         instance_id: i32,
+        custom_domain: Option<Host>,
     ) -> Result<NewBlog> {
         let (pub_key, priv_key) = sign::gen_keypair();
         Ok(NewBlog {
@@ -450,6 +559,7 @@ impl NewBlog {
             instance_id,
             public_key: String::from_utf8(pub_key).or(Err(Error::Signature))?,
             private_key: Some(String::from_utf8(priv_key).or(Err(Error::Signature))?),
+            custom_domain,
             ..NewBlog::default()
         })
     }
@@ -477,6 +587,7 @@ pub(crate) mod tests {
                 "Blog name".to_owned(),
                 "This is a small blog".to_owned(),
                 Instance::get_local().unwrap().id,
+                None,
             )
             .unwrap(),
         )
@@ -488,6 +599,7 @@ pub(crate) mod tests {
                 "My blog".to_owned(),
                 "Welcome to my blog".to_owned(),
                 Instance::get_local().unwrap().id,
+                Some(Host::new("blog.myname.me")),
             )
             .unwrap(),
         )
@@ -499,6 +611,7 @@ pub(crate) mod tests {
                 "Why I like Plume".to_owned(),
                 "In this blog I will explay you why I like Plume so much".to_owned(),
                 Instance::get_local().unwrap().id,
+                None,
             )
             .unwrap(),
         )
@@ -559,6 +672,7 @@ pub(crate) mod tests {
                     "Some name".to_owned(),
                     "This is some blog".to_owned(),
                     Instance::get_local().unwrap().id,
+                    Some(Host::new("some.blog.com")),
                 )
                 .unwrap(),
             )
@@ -587,6 +701,7 @@ pub(crate) mod tests {
                     "Some name".to_owned(),
                     "This is some blog".to_owned(),
                     Instance::get_local().unwrap().id,
+                    None,
                 )
                 .unwrap(),
             )
@@ -598,6 +713,7 @@ pub(crate) mod tests {
                     "Blog".to_owned(),
                     "I've named my blog Blog".to_owned(),
                     Instance::get_local().unwrap().id,
+                    Some(Host::new("named.example.blog")),
                 )
                 .unwrap(),
             )
@@ -690,6 +806,7 @@ pub(crate) mod tests {
                     "Some name".to_owned(),
                     "This is some blog".to_owned(),
                     Instance::get_local().unwrap().id,
+                    None,
                 )
                 .unwrap(),
             )
@@ -714,6 +831,7 @@ pub(crate) mod tests {
                     "Some name".to_owned(),
                     "This is some blog".to_owned(),
                     Instance::get_local().unwrap().id,
+                    Some(Host::new("some.blog.com")),
                 )
                 .unwrap(),
             )
@@ -752,6 +870,7 @@ pub(crate) mod tests {
                     "Some name".to_owned(),
                     "This is some blog".to_owned(),
                     Instance::get_local().unwrap().id,
+                    None,
                 )
                 .unwrap(),
             )
@@ -763,6 +882,7 @@ pub(crate) mod tests {
                     "Blog".to_owned(),
                     "I've named my blog Blog".to_owned(),
                     Instance::get_local().unwrap().id,
+                    Some(Host::new("my.blog.com")),
                 )
                 .unwrap(),
             )

plume-models/src/lib.rs

@@ -10,6 +10,8 @@ extern crate bcrypt;
 extern crate chrono;
 #[macro_use]
 extern crate diesel;
+#[macro_use]
+extern crate diesel_derive_newtype;
 extern crate guid_create;
 extern crate heck;
 extern crate itertools;

plume-models/src/schema.rs

@@ -1,17 +1,17 @@
 table! {
     api_tokens (id) {
-        id -> Int4,
+        id -> Integer,
         creation_date -> Timestamp,
         value -> Text,
         scopes -> Text,
-        app_id -> Int4,
-        user_id -> Int4,
+        app_id -> Integer,
+        user_id -> Integer,
     }
 }
 
 table! {
     apps (id) {
-        id -> Int4,
+        id -> Integer,
         name -> Text,
         client_id -> Text,
         client_secret -> Text,
@@ -23,70 +23,71 @@ table! {
 
 table! {
     blog_authors (id) {
-        id -> Int4,
-        blog_id -> Int4,
-        author_id -> Int4,
+        id -> Integer,
+        blog_id -> Integer,
+        author_id -> Integer,
         is_owner -> Bool,
     }
 }
 
 table! {
     blogs (id) {
-        id -> Int4,
-        actor_id -> Varchar,
-        title -> Varchar,
+        id -> Integer,
+        actor_id -> Text,
+        title -> Text,
         summary -> Text,
-        outbox_url -> Varchar,
-        inbox_url -> Varchar,
-        instance_id -> Int4,
+        outbox_url -> Text,
+        inbox_url -> Text,
+        instance_id -> Integer,
         creation_date -> Timestamp,
         ap_url -> Text,
         private_key -> Nullable<Text>,
         public_key -> Text,
         fqn -> Text,
         summary_html -> Text,
-        icon_id -> Nullable<Int4>,
-        banner_id -> Nullable<Int4>,
+        icon_id -> Nullable<Integer>,
+        banner_id -> Nullable<Integer>,
+        custom_domain -> Nullable<Text>,
+    }
+}
+
+table! {
+    comment_seers (id) {
+        id -> Integer,
+        comment_id -> Integer,
+        user_id -> Integer,
     }
 }
 
 table! {
     comments (id) {
-        id -> Int4,
+        id -> Integer,
         content -> Text,
-        in_response_to_id -> Nullable<Int4>,
-        post_id -> Int4,
-        author_id -> Int4,
+        in_response_to_id -> Nullable<Integer>,
+        post_id -> Integer,
+        author_id -> Integer,
         creation_date -> Timestamp,
-        ap_url -> Nullable<Varchar>,
+        ap_url -> Nullable<Text>,
         sensitive -> Bool,
         spoiler_text -> Text,
         public_visibility -> Bool,
     }
 }
 
-table! {
-    comment_seers (id) {
-        id -> Int4,
-        comment_id -> Int4,
-        user_id -> Int4,
-    }
-}
-
 table! {
     follows (id) {
-        id -> Int4,
-        follower_id -> Int4,
-        following_id -> Int4,
+        id -> Integer,
+        follower_id -> Integer,
+        following_id -> Integer,
         ap_url -> Text,
     }
 }
 
 table! {
     instances (id) {
-        id -> Int4,
-        public_domain -> Varchar,
-        name -> Varchar,
+        id -> Integer,
+        public_domain -> Text,
+        name -> Text,
         local -> Bool,
         blocked -> Bool,
         creation_date -> Timestamp,
@@ -94,50 +95,50 @@ table! {
         short_description -> Text,
         long_description -> Text,
         default_license -> Text,
-        long_description_html -> Varchar,
-        short_description_html -> Varchar,
+        long_description_html -> Text,
+        short_description_html -> Text,
     }
 }
 
 table! {
     likes (id) {
-        id -> Int4,
-        user_id -> Int4,
-        post_id -> Int4,
+        id -> Integer,
+        user_id -> Integer,
+        post_id -> Integer,
         creation_date -> Timestamp,
-        ap_url -> Varchar,
+        ap_url -> Text,
     }
 }
 
 table! {
     medias (id) {
-        id -> Int4,
+        id -> Integer,
         file_path -> Text,
         alt_text -> Text,
         is_remote -> Bool,
         remote_url -> Nullable<Text>,
         sensitive -> Bool,
         content_warning -> Nullable<Text>,
-        owner_id -> Int4,
+        owner_id -> Integer,
     }
 }
 
 table! {
     mentions (id) {
-        id -> Int4,
-        mentioned_id -> Int4,
-        post_id -> Nullable<Int4>,
-        comment_id -> Nullable<Int4>,
+        id -> Integer,
+        mentioned_id -> Integer,
+        post_id -> Nullable<Integer>,
+        comment_id -> Nullable<Integer>,
     }
 }
 
 table! {
     notifications (id) {
-        id -> Int4,
-        user_id -> Int4,
+        id -> Integer,
+        user_id -> Integer,
         creation_date -> Timestamp,
-        kind -> Varchar,
-        object_id -> Int4,
+        kind -> Text,
+        object_id -> Integer,
     }
 }
 
@@ -152,67 +153,67 @@ table! {
 
 table! {
     post_authors (id) {
-        id -> Int4,
-        post_id -> Int4,
-        author_id -> Int4,
+        id -> Integer,
+        post_id -> Integer,
+        author_id -> Integer,
     }
 }
 
 table! {
     posts (id) {
-        id -> Int4,
-        blog_id -> Int4,
-        slug -> Varchar,
-        title -> Varchar,
+        id -> Integer,
+        blog_id -> Integer,
+        slug -> Text,
+        title -> Text,
         content -> Text,
         published -> Bool,
-        license -> Varchar,
+        license -> Text,
         creation_date -> Timestamp,
-        ap_url -> Varchar,
+        ap_url -> Text,
         subtitle -> Text,
         source -> Text,
-        cover_id -> Nullable<Int4>,
+        cover_id -> Nullable<Integer>,
     }
 }
 
 table! {
     reshares (id) {
-        id -> Int4,
-        user_id -> Int4,
-        post_id -> Int4,
-        ap_url -> Varchar,
+        id -> Integer,
+        user_id -> Integer,
+        post_id -> Integer,
+        ap_url -> Text,
         creation_date -> Timestamp,
     }
 }
 
 table! {
     tags (id) {
-        id -> Int4,
+        id -> Integer,
         tag -> Text,
         is_hashtag -> Bool,
-        post_id -> Int4,
+        post_id -> Integer,
     }
 }
 
 table! {
     users (id) {
-        id -> Int4,
-        username -> Varchar,
-        display_name -> Varchar,
-        outbox_url -> Varchar,
-        inbox_url -> Varchar,
+        id -> Integer,
+        username -> Text,
+        display_name -> Text,
+        outbox_url -> Text,
+        inbox_url -> Text,
         is_admin -> Bool,
         summary -> Text,
         email -> Nullable<Text>,
         hashed_password -> Nullable<Text>,
-        instance_id -> Int4,
+        instance_id -> Integer,
         creation_date -> Timestamp,
         ap_url -> Text,
         private_key -> Nullable<Text>,
         public_key -> Text,
-        shared_inbox_url -> Nullable<Varchar>,
-        followers_endpoint -> Varchar,
-        avatar_id -> Nullable<Int4>,
+        shared_inbox_url -> Nullable<Text>,
+        followers_endpoint -> Text,
+        avatar_id -> Nullable<Integer>,
         last_fetched_date -> Timestamp,
         fqn -> Text,
         summary_html -> Text,
@@ -248,8 +249,8 @@ allow_tables_to_appear_in_same_query!(
     apps,
     blog_authors,
     blogs,
-    comments,
     comment_seers,
+    comments,
     follows,
     instances,
     likes,

po/plume/plume.pot

@@ -36,39 +36,39 @@ msgstr ""
 msgid "{0}'s avatar"
 msgstr ""
 
-# src/routes/blogs.rs:64
+# src/routes/blogs.rs:96
 msgid "To create a new blog, you need to be logged in"
 msgstr ""
 
-# src/routes/blogs.rs:106
+# src/routes/blogs.rs:138
 msgid "A blog with the same name already exists."
 msgstr ""
 
-# src/routes/blogs.rs:141
+# src/routes/blogs.rs:173
 msgid "Your blog was successfully created!"
 msgstr ""
 
-# src/routes/blogs.rs:163
+# src/routes/blogs.rs:195
 msgid "Your blog was deleted."
 msgstr ""
 
-# src/routes/blogs.rs:170
+# src/routes/blogs.rs:202
 msgid "You are not allowed to delete this blog."
 msgstr ""
 
-# src/routes/blogs.rs:218
+# src/routes/blogs.rs:250
 msgid "You are not allowed to edit this blog."
 msgstr ""
 
-# src/routes/blogs.rs:263
+# src/routes/blogs.rs:295
 msgid "You can't use this media as a blog icon."
 msgstr ""
 
-# src/routes/blogs.rs:281
+# src/routes/blogs.rs:313
 msgid "You can't use this media as a blog banner."
 msgstr ""
 
-# src/routes/blogs.rs:314
+# src/routes/blogs.rs:346
 msgid "Your blog information have been updated."
 msgstr ""
 

src/main.rs

@@ -22,6 +22,7 @@ extern crate num_cpus;
 extern crate plume_api;
 extern crate plume_common;
 extern crate plume_models;
+extern crate reqwest;
 #[macro_use]
 extern crate rocket;
 extern crate rocket_contrib;
@@ -42,17 +43,21 @@ extern crate webfinger;
 use clap::App;
 use diesel::r2d2::ConnectionManager;
 use plume_models::{
+    blogs::Blog,
+    blogs::Host,
     db_conn::{DbPool, PragmaForeignKey},
     instance::Instance,
     migrations::IMPORTED_MIGRATIONS,
     search::{Searcher as UnmanagedSearcher, SearcherError},
     Connection, Error, CONFIG,
 };
+use rocket::{fairing::AdHoc, http::ext::IntoOwned, http::uri::Origin};
 use rocket_csrf::CsrfFairingBuilder;
 use scheduled_thread_pool::ScheduledThreadPool;
+use std::collections::HashMap;
 use std::process::exit;
 use std::sync::{Arc, Mutex};
-use std::time::Duration;
+use std::time::{Duration, Instant};
 
 init_i18n!(
     "plume", ar, bg, ca, cs, de, en, eo, es, fr, gl, hi, hr, it, ja, nb, pl, pt, ro, ru, sr, sk, sv
@@ -87,6 +92,7 @@ fn init_pool() -> Option<DbPool> {
         .build(manager)
         .ok()?;
     Instance::cache_local(&pool.get().unwrap());
+    Blog::cache_custom_domains(&pool.get().unwrap());
     Some(pool)
 }
 
@@ -175,7 +181,42 @@ Then try to restart Plume
         println!("Please refer to the documentation to see how to configure it.");
     }
 
+    let custom_domain_fairing = AdHoc::on_request("Custom Blog Domains", |req, _data| {
+        let host = req.guard::<Host>();
+        if host.is_success()
+            && req
+                .uri()
+                .segments()
+                .next()
+                .map(|path| path != "static" && path != "api")
+                .unwrap_or(true)
+        {
+            let rewrite_uri = format!("/custom_domains/{}/{}", host.unwrap(), req.uri());
+            let uri = Origin::parse_owned(rewrite_uri).unwrap();
+            let uri = uri.to_normalized().into_owned();
+            req.set_uri(uri);
+        }
+    });
+
+    let valid_domains: HashMap<String, Instant> = HashMap::new();
     let rocket = rocket::custom(CONFIG.rocket.clone().unwrap())
+        .mount(
+            "/custom_domains/domain_validation/",
+            routes![routes::blogs::custom::domain_validation,],
+        )
+        .mount(
+            "/domain_validation/",
+            routes![routes::blogs::domain_validation,],
+        )
+        .mount(
+            "/custom_domains/",
+            routes![
+                routes::blogs::custom::details,
+                routes::posts::custom::details,
+                routes::blogs::custom::activity_details,
+                routes::search::custom::search,
+            ],
+        )
         .mount(
             "/",
             routes![
@@ -288,6 +329,7 @@ Then try to restart Plume
         .manage(dbpool)
         .manage(Arc::new(workpool))
         .manage(searcher)
+        .manage(Mutex::new(valid_domains))
         .manage(include_i18n!())
         .attach(
             CsrfFairingBuilder::new()
@@ -314,7 +356,8 @@ Then try to restart Plume
                 ])
                 .finalize()
                 .expect("main: csrf fairing creation error"),
-        );
+        )
+        .attach(custom_domain_fairing);
 
     #[cfg(feature = "test")]
     let rocket = rocket.mount("/test", routes![test_routes::health,]);

src/routes/blogs.rs

@@ -2,11 +2,14 @@ use activitypub::collection::OrderedCollection;
 use atom_syndication::{Entry, FeedBuilder};
 use diesel::SaveChangesDsl;
 use rocket::{
-    http::ContentType,
+    http::{ContentType, Status},
     request::LenientForm,
     response::{content::Content, Flash, Redirect},
+    State,
 };
 use rocket_i18n::I18n;
+use std::sync::Mutex;
+use std::time::{Duration, Instant};
 use std::{borrow::Cow, collections::HashMap};
 use validator::{Validate, ValidationError, ValidationErrors};
 
@@ -16,14 +19,17 @@ use plume_models::{
     blog_authors::*, blogs::*, instance::Instance, medias::*, posts::Post, safe_string::SafeString,
     users::User, Connection, PlumeRocket,
 };
+use reqwest::Client;
 use routes::{errors::ErrorPage, Page, RespondOrRedirect};
 use template_utils::{IntoContext, Ructe};
 
-#[get("/~/<name>?<page>", rank = 2)]
-pub fn details(name: String, page: Option<Page>, rockets: PlumeRocket) -> Result<Ructe, ErrorPage> {
+fn detail_guts(
+    blog: Blog,
+    page: Option<Page>,
+    rockets: PlumeRocket,
+) -> Result<RespondOrRedirect, ErrorPage> {
     let page = page.unwrap_or_default();
     let conn = &*rockets.conn;
-    let blog = Blog::find_by_fqn(&rockets, &name)?;
     let posts = Post::blog_page(conn, &blog, page.limits())?;
     let articles_count = Post::count_for_blog(conn, &blog)?;
     let authors = &blog.list_authors(conn)?;
@@ -35,7 +41,43 @@ pub fn details(name: String, page: Option<Page>, rockets: PlumeRocket) -> Result
         page.0,
         Page::total(articles_count as i32),
         posts
-    )))
+    ))
+    .into())
+}
+
+#[get("/~/<name>?<page>", rank = 2)]
+pub fn details(
+    name: String,
+    page: Option<Page>,
+    rockets: PlumeRocket,
+) -> Result<RespondOrRedirect, ErrorPage> {
+    let blog = Blog::find_by_fqn(&rockets, &name)?;
+
+    // check this first, and return early
+    // doing this prevents partially moving `blog` into the `match (tuple)`,
+    // which makes it impossible to reuse then.
+    if blog.custom_domain == None {
+        return detail_guts(blog, page, rockets);
+    }
+
+    match (blog.custom_domain, page) {
+        (Some(ref custom_domain), Some(ref page)) => {
+            Ok(Redirect::to(format!("https://{}/?page={}", custom_domain, page)).into())
+        }
+        (Some(ref custom_domain), _) => {
+            Ok(Redirect::to(format!("https://{}/", custom_domain)).into())
+        }
+        // we need this match arm, or the match won't compile
+        (None, _) => unreachable!("This code path should have already been handled!"),
+    }
+}
+
+pub fn activity_detail_guts(
+    blog: Blog,
+    rockets: PlumeRocket,
+    _ap: ApRequest,
+) -> Option<ActivityStream<CustomGroup>> {
+    Some(ActivityStream::new(blog.to_activity(&*rockets.conn).ok()?))
 }
 
 #[get("/~/<name>", rank = 1)]
@@ -45,7 +87,7 @@ pub fn activity_details(
     _ap: ApRequest,
 ) -> Option<ActivityStream<CustomGroup>> {
     let blog = Blog::find_by_fqn(&rockets, &name).ok()?;
-    Some(ActivityStream::new(blog.to_activity(&*rockets.conn).ok()?))
+    activity_detail_guts(blog, rockets, _ap)
 }
 
 #[get("/blogs/new")]
@@ -57,6 +99,76 @@ pub fn new(rockets: PlumeRocket, _user: User) -> Ructe {
     ))
 }
 
+// mounted as /domain_validation/
+#[get("/<validation_id>")]
+pub fn domain_validation(
+    validation_id: String,
+    valid_domains: State<Mutex<HashMap<String, Instant>>>,
+) -> Status {
+    let mutex = valid_domains.inner().lock();
+    let mut validation_map = mutex.unwrap();
+    let validation_getter = validation_map.clone();
+
+    let value = validation_getter.get(&validation_id);
+    if value.is_none() {
+        // validation id not found
+        return Status::NotFound;
+    }
+
+    // we have valid id, now check the time
+    let valid_until = value.unwrap();
+    let now = Instant::now();
+
+    // nope, expired (410: gone)
+    if now.duration_since(*valid_until).as_secs() > 0 {
+        validation_map.remove(&validation_id);
+        // validation expired
+        return Status::Gone;
+    }
+
+    validation_map.remove(&validation_id);
+    Status::Ok
+}
+
+pub mod custom {
+    use plume_common::activity_pub::{ActivityStream, ApRequest};
+    use plume_models::{blogs::Blog, blogs::CustomGroup, blogs::Host, PlumeRocket};
+    use rocket::{http::Status, State};
+    use routes::{errors::ErrorPage, Page, RespondOrRedirect};
+    use std::collections::HashMap;
+    use std::sync::Mutex;
+    use std::time::Instant;
+
+    #[get("/<custom_domain>?<page>", rank = 2)]
+    pub fn details(
+        custom_domain: String,
+        page: Option<Page>,
+        rockets: PlumeRocket,
+    ) -> Result<RespondOrRedirect, ErrorPage> {
+        let blog = Blog::find_by_host(&rockets, Host::new(custom_domain))?;
+        super::detail_guts(blog, page, rockets)
+    }
+
+    #[get("/<custom_domain>", rank = 1)]
+    pub fn activity_details(
+        custom_domain: String,
+        rockets: PlumeRocket,
+        _ap: ApRequest,
+    ) -> Option<ActivityStream<CustomGroup>> {
+        let blog = Blog::find_by_host(&rockets, Host::new(custom_domain)).ok()?;
+        super::activity_detail_guts(blog, rockets, _ap)
+    }
+
+    // mounted as /custom_domains/domain_validation/
+    #[get("/<validation_id>")]
+    pub fn domain_validation(
+        validation_id: String,
+        valid_domains: State<Mutex<HashMap<String, Instant>>>,
+    ) -> Status {
+        super::domain_validation(validation_id, valid_domains)
+    }
+}
+
 #[get("/blogs/new", rank = 2)]
 pub fn new_auth(i18n: I18n) -> Flash<Redirect> {
     utils::requires_login(
@@ -72,6 +184,7 @@ pub fn new_auth(i18n: I18n) -> Flash<Redirect> {
 pub struct NewBlogForm {
     #[validate(custom(function = "valid_slug", message = "Invalid name"))]
     pub title: String,
+    pub custom_domain: String,
 }
 
 fn valid_slug(title: &str) -> Result<(), ValidationError> {
@@ -83,13 +196,43 @@ fn valid_slug(title: &str) -> Result<(), ValidationError> {
     }
 }
 
+fn valid_domain(domain: &str, valid_domains: State<Mutex<HashMap<String, Instant>>>) -> bool {
+    let mutex = valid_domains.inner().lock();
+    let mut validation_map = mutex.unwrap();
+
+    let random_id = utils::random_hex();
+    validation_map.insert(
+        random_id.clone(),
+        Instant::now().checked_add(Duration::new(60, 0)).unwrap(),
+    );
+
+    let client = Client::new();
+    let validation_uri = format!("https://{}/domain_validation/{}", domain, random_id);
+
+    match client.get(&validation_uri).send() {
+        Ok(resp) => resp.status().is_success(),
+        Err(_) => false,
+    }
+}
+
 #[post("/blogs/new", data = "<form>")]
-pub fn create(form: LenientForm<NewBlogForm>, rockets: PlumeRocket) -> RespondOrRedirect {
+pub fn create(
+    form: LenientForm<NewBlogForm>,
+    rockets: PlumeRocket,
+    valid_domains: State<Mutex<HashMap<String, Instant>>>,
+) -> RespondOrRedirect {
     let slug = utils::make_actor_id(&form.title);
     let conn = &*rockets.conn;
     let intl = &rockets.intl.catalog;
     let user = rockets.user.clone().unwrap();
 
+    let (custom_domain, dns_ok) = if form.custom_domain.is_empty() {
+        (None, true)
+    } else {
+        let dns_check = valid_domain(&form.custom_domain.clone(), valid_domains);
+        (Some(Host::new(form.custom_domain.clone())), dns_check)
+    };
+
     let mut errors = match form.validate() {
         Ok(_) => ValidationErrors::new(),
         Err(e) => e,
@@ -121,6 +264,7 @@ pub fn create(form: LenientForm<NewBlogForm>, rockets: PlumeRocket) -> RespondOr
             Instance::get_local()
                 .expect("blog::create: instance error")
                 .id,
+            custom_domain,
         )
         .expect("blog::create: new local error"),
     )
@@ -136,11 +280,19 @@ pub fn create(form: LenientForm<NewBlogForm>, rockets: PlumeRocket) -> RespondOr
     )
     .expect("blog::create: author error");
 
-    Flash::success(
-        Redirect::to(uri!(details: name = slug.clone(), page = _)),
-        &i18n!(intl, "Your blog was successfully created!"),
-    )
-    .into()
+    if dns_ok {
+        Flash::success(
+            Redirect::to(uri!(details: name = slug.clone(), page = _)),
+            &i18n!(intl, "Your blog was successfully created!"),
+        )
+        .into()
+    } else {
+        Flash::warning(
+            Redirect::to(uri!(details: name = slug.clone(), page = _)),
+            &i18n!(intl, "Your blog was successfully created, but the custom domain seems invalid. Please check it is correct from your blog's settings."),
+        )
+        .into()
+    }
 }
 
 #[post("/~/<name>/delete")]
@@ -181,6 +333,7 @@ pub struct EditForm {
     pub summary: String,
     pub icon: Option<i32>,
     pub banner: Option<i32>,
+    pub custom_domain: String,
 }
 
 #[get("/~/<name>/edit")]
@@ -198,6 +351,10 @@ pub fn edit(name: String, rockets: PlumeRocket) -> Result<Ructe, ErrorPage> {
             .clone()
             .expect("blogs::edit: User was None while it shouldn't");
         let medias = Media::for_user(conn, user.id).expect("Couldn't list media");
+        let custom_domain = match blog.custom_domain {
+            Some(ref c) => c.to_string(),
+            _ => String::from(""),
+        };
         Ok(render!(blogs::edit(
             &rockets.to_context(),
             &blog,
@@ -207,6 +364,7 @@ pub fn edit(name: String, rockets: PlumeRocket) -> Result<Ructe, ErrorPage> {
                 summary: blog.summary.clone(),
                 icon: blog.icon_id,
                 banner: blog.banner_id,
+                custom_domain: custom_domain,
             },
             ValidationErrors::default()
         )))
@@ -318,6 +476,10 @@ pub fn update(
             );
             blog.icon_id = form.icon;
             blog.banner_id = form.banner;
+            if !form.custom_domain.is_empty() {
+                blog.custom_domain = Some(Host::new(form.custom_domain.clone()))
+            }
+
             blog.save_changes::<Blog>(&*conn)
                 .expect("Couldn't save blog changes");
             Ok(Flash::success(

src/routes/errors.rs

@@ -1,6 +1,6 @@
-use plume_models::{Error, PlumeRocket};
+use plume_models::{instance::Instance, Error, PlumeRocket};
 use rocket::{
-    response::{self, Responder},
+    response::{self, Redirect, Responder},
     Request,
 };
 use template_utils::{IntoContext, Ructe};
@@ -29,9 +29,26 @@ impl<'r> Responder<'r> for ErrorPage {
 }
 
 #[catch(404)]
-pub fn not_found(req: &Request) -> Ructe {
+pub fn not_found(req: &Request) -> Result<Ructe, Redirect> {
     let rockets = req.guard::<PlumeRocket>().unwrap();
-    render!(errors::not_found(&rockets.to_context()))
+    if req
+        .uri()
+        .segments()
+        .next()
+        .map(|path| path == "custom_domains")
+        .unwrap_or(false)
+    {
+        let path = req
+            .uri()
+            .segments()
+            .skip(2)
+            .collect::<Vec<&str>>()
+            .join("/");
+        let public_domain = Instance::get_local().unwrap().public_domain;
+        Err(Redirect::to(format!("https://{}/{}", public_domain, path)))
+    } else {
+        Ok(render!(errors::not_found(&rockets.to_context())))
+    }
 }
 
 #[catch(422)]

src/routes/mod.rs

@@ -10,6 +10,7 @@ use rocket::{
     response::{Flash, NamedFile, Redirect},
     Outcome,
 };
+use std::fmt;
 use std::path::{Path, PathBuf};
 use template_utils::Ructe;
 
@@ -52,9 +53,15 @@ impl From<Flash<Redirect>> for RespondOrRedirect {
     }
 }
 
-#[derive(Shrinkwrap, Copy, Clone, UriDisplayQuery)]
+#[derive(Debug, Shrinkwrap, Copy, Clone, UriDisplayQuery)]
 pub struct Page(i32);
 
+impl fmt::Display for Page {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self.0)
+    }
+}
+
 impl<'v> FromFormValue<'v> for Page {
     type Error = &'v RawStr;
     fn from_form_value(form_value: &'v RawStr) -> Result<Page, &'v RawStr> {

src/routes/posts.rs

@@ -31,28 +31,14 @@ use routes::{
 };
 use template_utils::{IntoContext, Ructe};
 
-#[get("/~/<blog>/<slug>?<responding_to>", rank = 4)]
-pub fn details(
-    blog: String,
-    slug: String,
+fn detail_guts(
+    blog: &Blog,
+    post: &Post,
     responding_to: Option<i32>,
-    rockets: PlumeRocket,
-) -> Result<Ructe, ErrorPage> {
+    rockets: &PlumeRocket,
+) -> Result<RespondOrRedirect, ErrorPage> {
     let conn = &*rockets.conn;
     let user = rockets.user.clone();
-    let blog = Blog::find_by_fqn(&rockets, &blog)?;
-    let post = Post::find_by_slug(&*conn, &slug, blog.id)?;
-    if !(post.published
-        || post
-            .get_authors(&*conn)?
-            .into_iter()
-            .any(|a| a.id == user.clone().map(|u| u.id).unwrap_or(0)))
-    {
-        return Ok(render!(errors::not_authorized(
-            &rockets.to_context(),
-            i18n!(rockets.intl.catalog, "This post isn't published yet.")
-        )));
-    }
 
     let comments = CommentTree::from_post(&*conn, &post, user.as_ref())?;
 
@@ -61,7 +47,7 @@ pub fn details(
     Ok(render!(posts::details(
             &rockets.to_context(),
             post.clone(),
-            blog,
+            blog.clone(),
             &NewCommentForm {
                 warning: previous.clone().map(|p| p.spoiler_text).unwrap_or_default(),
                 content: previous.clone().and_then(|p| Some(format!(
@@ -94,7 +80,85 @@ pub fn details(
             user.clone().and_then(|u| u.has_reshared(&*conn, &post).ok()).unwrap_or(false),
             user.and_then(|u| u.is_following(&*conn, post.get_authors(&*conn).ok()?[0].id).ok()).unwrap_or(false),
             post.get_authors(&*conn)?[0].clone()
-        )))
+        )).into())
+}
+
+#[get("/~/<blog>/<slug>?<responding_to>", rank = 4)]
+pub fn details(
+    blog: String,
+    slug: String,
+    responding_to: Option<i32>,
+    rockets: PlumeRocket,
+) -> Result<RespondOrRedirect, ErrorPage> {
+    let conn = &*rockets.conn;
+    let user = rockets.user.clone();
+    let blog = Blog::find_by_fqn(&rockets, &blog)?;
+    let post = Post::find_by_slug(&*conn, &slug, blog.id)?;
+
+    if !(post.published
+        || post
+            .get_authors(&*conn)?
+            .into_iter()
+            .any(|a| a.id == user.clone().map(|u| u.id).unwrap_or(0)))
+    {
+        return Ok(render!(errors::not_authorized(
+            &rockets.to_context(),
+            i18n!(rockets.intl.catalog, "This post isn't published yet.")
+        ))
+        .into());
+    }
+
+    // check this first, and return early
+    // doing this prevents partially moving `blog` into the `match (tuple)`,
+    // which makes it impossible to reuse then.
+    if blog.custom_domain == None {
+        return detail_guts(&blog, &post, responding_to, &rockets);
+    }
+
+    match (blog.custom_domain, responding_to) {
+        (Some(ref custom_domain), Some(ref responding_to)) => Ok(Redirect::to(format!(
+            "https://{}/{}?responding_to={}",
+            custom_domain, slug, responding_to
+        ))
+        .into()),
+        (Some(ref custom_domain), _) => {
+            Ok(Redirect::to(format!("https://{}/{}", custom_domain, slug)).into())
+        }
+        (None, _) => unreachable!("This code path should have already been handled!"),
+    }
+}
+
+pub mod custom {
+    use plume_models::{blogs::Blog, blogs::Host, posts::Post, PlumeRocket};
+    use routes::{errors::ErrorPage, RespondOrRedirect};
+    use template_utils::{IntoContext, Ructe};
+
+    #[get("/<custom_domain>/<slug>?<responding_to>", rank = 4)]
+    pub fn details(
+        custom_domain: String,
+        slug: String,
+        responding_to: Option<i32>,
+        rockets: PlumeRocket,
+    ) -> Result<RespondOrRedirect, ErrorPage> {
+        let conn = &*rockets.conn;
+        let user = rockets.user.clone();
+        let blog = Blog::find_by_host(&rockets, Host::new(custom_domain))?;
+        let post = Post::find_by_slug(&*conn, &slug, blog.id)?;
+        if !(post.published
+            || post
+                .get_authors(&*conn)?
+                .into_iter()
+                .any(|a| a.id == user.clone().map(|u| u.id).unwrap_or(0)))
+        {
+            return Ok(render!(errors::not_authorized(
+                &rockets.to_context(),
+                i18n!(rockets.intl.catalog, "This post isn't published yet.")
+            ))
+            .into());
+        }
+
+        super::detail_guts(&blog, &post, responding_to, &rockets)
+    }
 }
 
 #[get("/~/<blog>/<slug>", rank = 3)]

src/routes/search.rs

@@ -49,8 +49,7 @@ macro_rules! param_to_query {
     }
 }
 
-#[get("/search?<query..>")]
-pub fn search(query: Option<Form<SearchQuery>>, rockets: PlumeRocket) -> Ructe {
+fn search_guts(query: Option<Form<SearchQuery>>, rockets: PlumeRocket) -> Ructe {
     let conn = &*rockets.conn;
     let query = query.map(Form::into_inner).unwrap_or_default();
     let page = query.page.unwrap_or_default();
@@ -83,3 +82,23 @@ pub fn search(query: Option<Form<SearchQuery>>, rockets: PlumeRocket) -> Ructe {
         ))
     }
 }
+
+#[get("/search?<query..>")]
+pub fn search(query: Option<Form<SearchQuery>>, rockets: PlumeRocket) -> Ructe {
+    search_guts(query, rockets)
+}
+
+pub mod custom {
+    use plume_models::PlumeRocket;
+    use rocket::request::Form;
+    use template_utils::Ructe;
+
+    #[get("/<_custom_domain>/search?<query..>")]
+    pub fn search(
+        _custom_domain: String,
+        query: Option<Form<super::SearchQuery>>,
+        rockets: PlumeRocket,
+    ) -> Ructe {
+        super::search_guts(query, rockets)
+    }
+}

src/template_utils.rs

@@ -1,7 +1,10 @@
 use plume_models::{notifications::*, users::User, Connection, PlumeRocket};
 
 use rocket::http::hyper::header::{ETag, EntityTag};
-use rocket::http::{Method, Status};
+use rocket::http::{
+    uri::{FromUriParam, Query},
+    Method, Status,
+};
 use rocket::request::Request;
 use rocket::response::{self, content::Html as HtmlCt, Responder, Response};
 use rocket_i18n::Catalog;
@@ -13,6 +16,16 @@ pub use askama_escape::escape;
 
 pub static CACHE_NAME: &str = env!("CACHE_ID");
 
+pub struct NoValue; // workarround for missing FromUriParam implementation for Option
+
+impl FromUriParam<Query, NoValue> for Option<i32> {
+    type Target = Option<i32>;
+
+    fn from_uri_param(_: NoValue) -> Self::Target {
+        None
+    }
+}
+
 pub type BaseContext<'a> = &'a (
     &'a Connection,
     &'a Catalog,
@@ -342,3 +355,90 @@ macro_rules! input {
         ))
     }};
 }
+
+/// This macro imitate rocket's uri!, but with support for custom domains
+///
+/// It takes one more argument, domain, which must appear first, and must be an Option<&str>
+/// sample call :
+/// assuming both take the same parameters
+/// url!(custom_domain=Some("something.tld"), posts::details: slug = "title", responding_to = _, blog = "blogname"));
+///
+/// assuming posts::details take one more parameter than posts::custom::details
+/// url!(custom_domain=Some("something.tld"), posts::details:
+///          common=[slug = "title", responding_to = _],
+///          normal=[blog = "blogname"]));
+///
+/// you can also provide custom=[] for custom-domain specific arguments
+/// custom_domain can be changed to anything, indicating custom domain varname in the custom-domain
+/// function (most likely custom_domain or _custom_domain)
+macro_rules! url {
+    ($custom_domain:ident=$domain:expr, $module:ident::$route:ident:
+        common=[$($common_args:tt = $common_val:expr),*],
+        normal=[$($normal_args:tt = $normal_val:expr),*],
+        custom=[$($custom_args:tt = $custom_val:expr),*]) => {{
+        let domain: &Option<plume_models::blogs::Host> = &$domain; //for type inference with None
+        $(
+            let $common_args = $common_val;
+        )*
+        if let Some(domain) = domain {
+            $(
+                let $custom_args = $custom_val;
+            )*
+            let origin = uri!(crate::routes::$module::custom::$route:
+                              $custom_domain = domain.to_string(),
+                              $($common_args = $common_args,)*
+                              $($custom_args = $custom_args,)*
+                              );
+            let path = origin
+                .segments()
+                .skip(1)// skip is <custom_domain> part
+                .map(|seg| format!("/{}", seg)).collect::<String>();
+            let query = origin.query()
+                .filter(|q| !q.is_empty())
+                .map(|q| format!("?{}", q))
+                .unwrap_or_default();
+            format!("https://{}{}{}", &domain, path, query)
+        } else {
+            $(
+                let $normal_args = $normal_val;
+            )*
+            url!($module::$route:
+                 $($common_args = $common_args,)*
+                 $($normal_args = $normal_args,)*)
+                .to_string()
+        }
+    }};
+    ($cd:ident=$d:expr, $m:ident::$r:ident:
+        common=[$($tt:tt)*]) => {
+        url!($cd=$d, $m::$r: common=[$($tt)*], normal=[], custom=[])
+    };
+    ($cd:ident=$d:expr, $m:ident::$r:ident:
+        normal=[$($tt:tt)*]) => {
+        url!($cd=$d, $m::$r: common=[], normal=[$($tt)*], custom=[])
+    };
+    ($cd:ident=$d:expr, $m:ident::$r:ident:
+        custom=[$($tt:tt)*]) => {
+        url!($cd=$d, $m::$r: common=[], normal=[], custom=[$($tt)*])
+    };
+    ($cd:ident=$d:expr, $m:ident::$r:ident:
+        common=[$($co:tt)*],
+        normal=[$($no:tt)*]) => {
+        url!($cd=$d, $m::$r: common=[$($co)*], normal=[$($no)*], custom=[])
+    };
+    ($cd:ident=$d:expr, $m:ident::$r:ident:
+        common=[$($co:tt)*],
+        custom=[$($cu:tt)*]) => {
+        url!($cd=$d, $m::$r: common=[$($co)*], normal=[], custom=[$($cu)*])
+    };
+    ($cd:ident=$d:expr, $m:ident::$r:ident:
+        normal=[$($no:tt)*],
+        custom=[$($cu:tt)*]) => {
+        url!($cd=$d, $m::$r: common=[], normal=[$($no)*], custom=[$($cu)*])
+    };
+    ($custom_domain:ident=$domain:expr, $module:ident::$route:ident: $($common_args:tt)*) => {
+        url!($custom_domain=$domain, $module::$route: common=[$($common_args)*])
+    };
+    ($module:ident::$route:ident: $($tt:tt)*) => {
+            uri!(crate::routes::$module::$route: $($tt)*)
+    };
+}

templates/blogs/details.rs.html

@@ -13,8 +13,8 @@
 	<meta content="120" property="og:image:width" />
 	<meta content="120" property="og:image:height" />
 	<meta content="summary" property="twitter:card" />
-	<meta content="'@Instance::get_local().unwrap().name" property="og:site_name" />
-	<meta content="@blog.ap_url" property="og:url" />
+	<meta content="@Instance::get_local().unwrap().name" property="og:site_name" />
+	<meta content="@blog.url()" property="og:url" />
 	<meta content="@blog.fqn" property="profile:username" />
 	<meta content="@blog.title" property="og:title" />
 	<meta content="@blog.summary_html" name="description">
@@ -24,7 +24,7 @@
 	<link href='@Instance::get_local().unwrap().compute_box("~", &blog.fqn, "atom.xml")' rel='alternate' type='application/atom+xml'>
 	<link href='@blog.ap_url' rel='alternate' type='application/activity+json'>
 }, {
-    <a href="@uri!(blogs::details: name = &blog.fqn, page = _)" dir="auto">@blog.title</a>
+    <a href="@url!(custom_domain = blog.custom_domain, blogs::details: common=[page = None], normal=[name = &blog.fqn])" dir="auto">@blog.title</a>
 }, {
 <div class="hidden">
     @for author in authors {
@@ -55,7 +55,7 @@
                     <a href="@uri!(blogs::edit: name = &blog.fqn)" class="button" dir="auto">@i18n!(ctx.1, "Edit")</a>
                 }
             </div>
-            
+
             <main class="user-summary" dir="auto">
                 <p>
                     @i18n!(ctx.1, "There's one author on this blog: ", "There are {0} authors on this blog: "; authors.len())

templates/blogs/edit.rs.html

@@ -23,6 +23,8 @@
         <label for="summary">@i18n!(ctx.1, "Description")<small>@i18n!(ctx.1, "Markdown syntax is supported")</small></label>
         <textarea id="summary" name="summary" rows="20">@form.summary</textarea>
 
+        @input!(ctx.1, custom_domain (optional text), "Custom Domain", form, errors, "")
+
         <p>
             @i18n!(ctx.1, "You can upload images to your gallery, to use them as blog icons, or banners.")
             <a href="@uri!(medias::new)">@i18n!(ctx.1, "Upload images")</a>

templates/blogs/new.rs.html

@@ -9,7 +9,10 @@
 @:base(ctx, i18n!(ctx.1, "New Blog"), {}, {}, {
   <h1 dir="auto">@i18n!(ctx.1, "Create a blog")</h1>
   <form method="post" action="@uri!(blogs::create)">
-      @input!(ctx.1, title (text), "Title", form, errors, "required minlength=\"1\"")
+      @input!(ctx.1, title (text), "Title", form, errors.clone(), "required minlength=\"1\"")
       <input type="submit" value="@i18n!(ctx.1, "Create blog")" dir="auto"/>
+
+      @input!(ctx.1, custom_domain (optional text), "Custom Domain", form, errors, "")
+      <input type="submit" value="@i18n!(ctx.1, "Make your blog available under a custom domain")" dir="auto"/>
   </form>
 })

templates/partials/post_card.rs.html

@@ -9,7 +9,7 @@
         <div class="cover" style="background-image: url('@Html(article.cover_url(ctx.0).unwrap_or_default())')"></div>
     }
     <h3 class="p-name" dir="auto">
-        <a class="u-url" href="@uri!(posts::details: blog = article.get_blog(ctx.0).unwrap().fqn, slug = &article.slug, responding_to = _)">
+        <a class="u-url" href="@url!(custom_domain = article.get_blog(ctx.0).unwrap().custom_domain, posts::details: common=[ slug = &article.slug, responding_to = NoValue], normal=[blog = article.get_blog(ctx.0).unwrap().fqn])">
             @article.title
         </a>
     </h3>
@@ -25,10 +25,9 @@
         @if article.published {
 	       ⋅ <span class="dt-published" datetime="@article.creation_date.format("%F %T")">@article.creation_date.format("%B %e, %Y")</span>
         }
-        ⋅ <a href="@uri!(blogs::details: name = &article.get_blog(ctx.0).unwrap().fqn, page = _)">@article.get_blog(ctx.0).unwrap().title</a>
+        ⋅ <a href="@url!(custom_domain = article.get_blog(ctx.0).unwrap().custom_domain, blogs::details: common=[page = None], normal=[name = &article.get_blog(ctx.0).unwrap().fqn])">@article.get_blog(ctx.0).unwrap().title</a>
         @if !article.published {
             ⋅ @i18n!(ctx.1, "Draft")
         }
     </footer>
 </div>
-

templates/posts/details.rs.html

@@ -17,10 +17,10 @@
     @if article.cover_id.is_some() {
         <meta property="og:image" content="@Html(article.cover_url(ctx.0).unwrap_or_default())"/>
     }
-    <meta property="og:url" content="@uri!(posts::details: blog = &blog.fqn, slug = &article.slug, responding_to = _)"/>
+        <meta property="og:url" content="@url!(custom_domain = blog.custom_domain, posts::details: common=[slug = &article.slug, responding_to = NoValue], normal=[blog = &blog.fqn])"/>
     <meta property="og:description" content="@article.subtitle"/>
 }, {
-    <a href="@uri!(blogs::details: name = &blog.fqn, page = _)">@blog.title</a>
+    <a href="@url!(custom_domain = &blog.custom_domain, blogs::details: common=[page = None], normal=[name = &blog.fqn])">@blog.title</a>
 }, {
 <div class="h-entry">
     <header
@@ -54,7 +54,7 @@
             <ul class="tags" dir="auto">
                 @for tag in tags {
                     @if !tag.is_hashtag {
-                        <li><a class="p-category" href="@uri!(tags::tag: name = &tag.tag, page = _)">@tag.tag</a></li>
+                        <li><a class="p-category" href="@uri!(tags::tag: name = &tag.tag, page = None)">@tag.tag</a></li>
                     } else {
                         <span class="hidden p-category">@tag.tag</span>
                     }