Merge branch 'main' of git.hackbever.be:rusty-bever/blog

README.md

@@ -1,3 +1,38 @@
 # blog
 
-Handles the contents of the blogging section.
+Handles the contents of the blogging section.
+
+## Schema & Data Objects
+
+All objects have a personal UUID ID, generated automatically by PostgreSQL.
+
+### Sections
+
+Sections group posts according to a common subject or some other metric by
+which they could be grouped. They can be seen as sub-blogs within the larger
+system. Each post can be part of only one section, & posts not part of a
+section will not be shown in the public UI.
+
+A section has a title & optional description, along with a shortname. The
+shortname is what will be used inside URLs for routing.
+
+A section can be part of the default posts list, meaning all posts created in
+this section will be shown on the homepage. The default list is an aggregated
+list containing all default sections.
+
+A section can be private, meaning all posts created in this section will not be
+shown on the any public page without authentification. Furthermore, it can
+specify wether posts should have titles, or are not allowed to. This is to
+allow for creating microblogs, which do not require titles.
+
+### Posts & Versions
+
+A post represents a publication in a specific section. The posts table itself
+only specifies which section a post belongs to & wether or not the post is
+private. Any content of the actual post is stored a a version. A private post
+can only be seen by logged-in users with the right authorization.
+
+Each version has its own publication date, with the last publication being
+shown when visiting the post. The UI however should also expose a way to show
+previous versions of the post. Each version has its own title (if allowed) &
+content. A version can be a draft. This means that the version will not be shown in the public UI, allowing the user to finish it at a later time.

migrations/2021-09-13-143540_sections/down.sql

@@ -1,7 +1,8 @@
 -- This file should undo anything in `up.sql`
-drop trigger insert_enforce_post_titles on posts;
+drop trigger insert_enforce_version_titles on versions;
-drop trigger update_enforce_post_titles on posts;
+drop trigger update_enforce_version_titles on versions;
-drop function enforce_post_titles;
+drop function enforce_version_titles;
 
+drop table versions cascade;
 drop table posts cascade;
 drop table sections cascade;

migrations/2021-09-13-143540_sections/up.sql

@@ -1,4 +1,3 @@
--- Your SQL goes here
 create table sections (
     id uuid DEFAULT gen_random_uuid() PRIMARY KEY,
 
@@ -11,48 +10,80 @@ create table sections (
     -- Wether to show the section in the default list on the homepage
     is_default boolean NOT NULL DEFAULT false,
     -- Wether the posts should contain titles or not
-    has_titles boolean NOT NULL DEFAULT true
+    has_titles boolean NOT NULL DEFAULT true,
+    -- Wether posts in this section should be shown publicly
+    is_private boolean NOT NULL DEFAULT false
 );
 
 create table posts (
     id uuid DEFAULT gen_random_uuid() PRIMARY KEY,
 
-    section_id uuid NOT NULL REFERENCES sections(id) ON DELETE CASCADE,
+    -- Posts shouldn't get deleted when we delete a section, as they're the
-    -- Title of the post
+    -- most valuable part of a blog
-    -- Wether this is NULL or not is enforced using the enforce_post_titles trigger
+    section_id uuid NOT NULL REFERENCES sections(id) ON DELETE SET NULL,
-    title varchar(255),
+
-    -- Post date, defaults to today
+    -- Wether a post should be private
-    publish_date date NOT NULL DEFAULT now(),
+    is_private boolean NOT NULL DEFAULT false,
-    -- Content of the post
+    -- Wether the post is archived
-    content text NOT NULL
+    is_archived boolean NOT NULL DEFAULT false
 );
 
-create function enforce_post_titles() returns trigger as $enforce_post_titles$
+create table versions (
+    id uuid DEFAULT gen_random_uuid() PRIMARY KEY,
+
+    -- A version should be deleted when its referenced post is deleted
+    post_id uuid NOT NULL REFERENCES posts(id) ON DELETE CASCADE,
+
+    -- Title of the post. Wether this is NULL or not is enforced using the
+    -- enforce_post_titles trigger.
+    title varchar(255),
+    -- Publish date
+    publish_date date,
+    -- Content of the post, in Markdown
+    content text NOT NULL DEFAULT '',
+    -- Wether the version is still a draft
+    is_draft boolean NOT NULL default true,
+
+    -- This check allows draft posts to be created without having to enter a
+    -- publish date, but forces them to have one if they're not a draft.
+    CHECK (is_draft OR publish_date IS NOT NULL)
+);
+
+create function enforce_version_titles() returns trigger as $$
     begin
+        -- Draft versions shouldn't be evaluated.
+        if new.is_draft then
+            return new;
+        end if;
+
         -- Check for a wrongfully null title
         if new.title is null and exists (
-            select 1 from sections where id = new.section_id and has_titles
+            select 1 from posts 
+                inner join sections on posts.section_id = sections.id
+                where posts.id = new.post_id and sections.has_titles
         ) then
             raise exception 'Expected a post title, but got null.';
         end if;
 
         if new.title is not null and exists (
-            select 1 from sections where id = new.section_id and not has_titles
+            select 1 from posts 
+                inner join sections on posts.section_id = sections.id
+                where posts.id = new.post_id and not sections.has_titles
         ) then
             raise exception 'Expected an empty post title, but got a value.';
         end if;
 
         return new;
     end;
-$enforce_post_titles$ language plpgsql;
+$$ language plpgsql;
 
-create trigger insert_enforce_post_titles
+create trigger insert_enforce_version_titles
-    before insert on posts
+    before insert on versions
     for each row
-    execute function enforce_post_titles();
+    execute function enforce_version_titles();
 
-create trigger update_enforce_post_titles
+create trigger update_enforce_version_titles
-    before update of title on posts
+    before update of title on versions
     for each row
     when (old.title is distinct from new.title)
-    execute function enforce_post_titles();
+    execute function enforce_version_titles();

src/db/mod.rs

@@ -6,3 +6,6 @@ pub mod sections;
 
 pub use posts::{NewPost, PatchPost, Post};
 pub use sections::{NewSection, PatchSection, Section};
+
+pub const MAX_POSTS: u32 = 64;
+pub const MAX_SECTIONS: u32 = 64;

src/db/posts.rs

@@ -6,6 +6,7 @@ use uuid::Uuid;
 
 use crate::schema::{posts, posts::dsl::*};
 
+/// A post inside the database.
 #[derive(Queryable, Serialize)]
 pub struct Post
 {
@@ -16,6 +17,7 @@ pub struct Post
     pub content: String,
 }
 
+/// A new post to be added to the database.
 #[derive(Deserialize, Insertable)]
 #[table_name = "posts"]
 #[serde(rename_all = "camelCase")]
@@ -27,6 +29,7 @@ pub struct NewPost
     pub content: String,
 }
 
+/// A patch to be applied to a row in the database.
 #[derive(Deserialize, AsChangeset)]
 #[table_name = "posts"]
 pub struct PatchPost
@@ -37,15 +40,18 @@ pub struct PatchPost
     pub content: Option<String>,
 }
 
+/// Get a list of posts, specified by the offset & a limit. The maximum for `limit_` is determined
+/// by `super::MAX_POSTS`.
 pub fn get(conn: &PgConnection, offset_: u32, limit_: u32) -> RbResult<Vec<Post>>
 {
     Ok(posts
         .offset(offset_.into())
-        .limit(limit_.into())
+        .limit(std::cmp::min(limit_, super::MAX_POSTS).into())
         .load(conn)
         .map_err(|_| RbError::DbError("Couldn't query posts."))?)
 }
 
+/// Try to find a post given its id (primary key).
 pub fn find(conn: &PgConnection, id_: &Uuid) -> RbOption<Post>
 {
     match posts.find(id_).first(conn) {
@@ -55,6 +61,7 @@ pub fn find(conn: &PgConnection, id_: &Uuid) -> RbOption<Post>
     }
 }
 
+/// Create a new post & store it in the database.
 pub fn create(conn: &PgConnection, new_post: &NewPost) -> RbResult<Post>
 {
     Ok(insert_into(posts)
@@ -65,6 +72,7 @@ pub fn create(conn: &PgConnection, new_post: &NewPost) -> RbResult<Post>
     // TODO check for conflict?
 }
 
+/// Update a post in the database with a given ID, returning the updated row.
 pub fn update(conn: &PgConnection, post_id: &Uuid, patch_post: &PatchPost) -> RbResult<Post>
 {
     Ok(diesel::update(posts.filter(id.eq(post_id)))
@@ -73,6 +81,7 @@ pub fn update(conn: &PgConnection, post_id: &Uuid, patch_post: &PatchPost) -> Rb
         .map_err(|_| RbError::DbError("Couldn't update post."))?)
 }
 
+/// Delete a post with a given ID.
 pub fn delete(conn: &PgConnection, post_id: &Uuid) -> RbResult<()>
 {
     diesel::delete(posts.filter(id.eq(post_id)))

src/db/sections.rs

@@ -5,6 +5,7 @@ use uuid::Uuid;
 
 use crate::schema::{sections, sections::dsl::*};
 
+/// A section inside the database.
 #[derive(Queryable, Serialize)]
 pub struct Section
 {
@@ -16,6 +17,8 @@ pub struct Section
     pub has_titles: bool,
 }
 
+/// A new section to add. Any `Option` values will get replaced by their default value in the
+/// database.
 #[derive(Serialize, Deserialize, Insertable)]
 #[table_name = "sections"]
 #[serde(rename_all = "camelCase")]
@@ -28,6 +31,7 @@ pub struct NewSection
     pub has_titles: Option<bool>,
 }
 
+/// A patch to apply to a section.
 #[derive(Deserialize, AsChangeset)]
 #[table_name = "sections"]
 #[serde(rename_all = "camelCase")]
@@ -40,15 +44,18 @@ pub struct PatchSection
     has_titles: Option<bool>,
 }
 
+/// Get an amount of sections from the database, given an offset & limit. The maximum value for
+/// `limit_` is determined by `super::MAX_SECTIONS`.
 pub fn get(conn: &PgConnection, offset_: u32, limit_: u32) -> RbResult<Vec<Section>>
 {
     Ok(sections
         .offset(offset_.into())
-        .limit(limit_.into())
+        .limit(std::cmp::min(limit_, super::MAX_SECTIONS).into())
         .load(conn)
         .map_err(|_| RbError::DbError("Couldn't query sections."))?)
 }
 
+/// Try to find a section given its shortname.
 pub fn find_with_shortname(conn: &PgConnection, shortname_: &str) -> RbOption<Section>
 {
     match sections.filter(shortname.eq(shortname_)).first(conn) {
@@ -58,6 +65,7 @@ pub fn find_with_shortname(conn: &PgConnection, shortname_: &str) -> RbOption<Se
     }
 }
 
+/// Create a new section.
 pub fn create(conn: &PgConnection, new_section: &NewSection) -> RbResult<Section>
 {
     Ok(insert_into(sections)
@@ -68,6 +76,7 @@ pub fn create(conn: &PgConnection, new_section: &NewSection) -> RbResult<Section
     // TODO check for conflict?
 }
 
+/// Update a section given its ID.
 pub fn update(conn: &PgConnection, post_id: &Uuid, patch_post: &PatchSection) -> RbResult<Section>
 {
     Ok(diesel::update(sections.filter(id.eq(post_id)))
@@ -76,6 +85,7 @@ pub fn update(conn: &PgConnection, post_id: &Uuid, patch_post: &PatchSection) ->
         .map_err(|_| RbError::DbError("Couldn't update section."))?)
 }
 
+// Update a section given its shortname.
 pub fn update_with_shortname(
     conn: &PgConnection,
     shortname_: &str,
@@ -88,6 +98,7 @@ pub fn update_with_shortname(
         .map_err(|_| RbError::DbError("Couldn't update section with shortname."))?)
 }
 
+/// Delete a section given its ID.
 pub fn delete(conn: &PgConnection, post_id: &Uuid) -> RbResult<()>
 {
     diesel::delete(sections.filter(id.eq(post_id)))

src/main.rs

@@ -27,19 +27,22 @@ pub fn auth_header() -> rocket::http::Header<'static>
     return rocket::http::Header::new("Authorization", "Bearer eyJhbGciOiJIUzI1NiJ9.eyJpZCI6IjVjMjM2OTI0NjY4ZDQzZWFiNGNmNDczYjk1YWZiNzgzIiwidXNlcm5hbWUiOiJKb2huIERvZSIsImFkbWluIjp0cnVlLCJleHAiOjE1MTYyMzkwMjIwfQ.if939L9le8LP-dtXnQs-mHPkb-VieRAvAfSu20755jY");
 }
 
+/// Used by Rocket to store database connections.
 #[database("postgres_rb")]
 pub struct RbDbConn(diesel::PgConnection);
 
+/// Handles all error status codes.
 #[catch(default)]
 fn default_catcher(status: Status, _: &Request) -> Value
 {
     json!({"status": status.code, "message": ""})
 }
 
-embed_migrations!();
+/// Rocket fairing that executes the necessary migrations in our database.
-
 async fn run_db_migrations(rocket: Rocket<Build>) -> Result<Rocket<Build>, Rocket<Build>>
 {
+    embed_migrations!();
+
     let conn = RbDbConn::get_one(&rocket)
         .await
         .expect("database connection");
@@ -50,12 +53,15 @@ async fn run_db_migrations(rocket: Rocket<Build>) -> Result<Rocket<Build>, Rocke
     .await
 }
 
+/// Struct to deserialize from the config file. It contains any custom configuration our
+/// application might need besides the default Rocket variables.
 #[derive(Debug, Deserialize, Serialize)]
 pub struct RbConfig
 {
     jwt: JwtConf,
 }
 
+/// The main entrypoint of our program. It launches the Rocket instance.
 #[launch]
 fn rocket() -> _
 {
@@ -69,8 +75,6 @@ fn rocket() -> _
             "Run database migrations",
             run_db_migrations,
         ))
-        // .attach(AdHoc::try_on_ignite("Create admin user", create_admin_user))
-        // .attach(AdHoc::config::<JwtConf>())
         .register("/", catchers![default_catcher])
         .mount(
             "/v1/sections",

src/schema.rs

@@ -2,9 +2,8 @@ table! {
     posts (id) {
         id -> Uuid,
         section_id -> Uuid,
-        title -> Nullable<Varchar>,
+        is_private -> Bool,
-        publish_date -> Date,
+        is_archived -> Bool,
-        content -> Text,
     }
 }
 
@@ -16,9 +15,26 @@ table! {
         description -> Nullable<Text>,
         is_default -> Bool,
         has_titles -> Bool,
+        is_private -> Bool,
+    }
+}
+
+table! {
+    versions (id) {
+        id -> Uuid,
+        post_id -> Uuid,
+        title -> Nullable<Varchar>,
+        publish_date -> Nullable<Date>,
+        content -> Text,
+        is_draft -> Bool,
     }
 }
 
 joinable!(posts -> sections (section_id));
+joinable!(versions -> posts (post_id));
 
-allow_tables_to_appear_in_same_query!(posts, sections,);
+allow_tables_to_appear_in_same_query!(
+    posts,
+    sections,
+    versions,
+);

src/v1/posts.rs

@@ -7,6 +7,7 @@ use rocket::serde::json::Json;
 
 use crate::RbDbConn;
 
+/// Get one or more posts.
 #[get("/?<offset>&<limit>")]
 pub async fn get(conn: RbDbConn, offset: u32, limit: u32) -> RbResult<Json<Vec<db::Post>>>
 {
@@ -15,6 +16,7 @@ pub async fn get(conn: RbDbConn, offset: u32, limit: u32) -> RbResult<Json<Vec<d
     ))
 }
 
+/// Create a new post.
 #[post("/", data = "<new_post>")]
 pub async fn create(
     _admin: Admin,
@@ -28,6 +30,7 @@ pub async fn create(
     ))
 }
 
+/// Get a post given its ID.
 #[get("/<id>")]
 pub async fn find(conn: RbDbConn, id: uuid::Uuid) -> RbOption<Json<db::Post>>
 {
@@ -37,6 +40,7 @@ pub async fn find(conn: RbDbConn, id: uuid::Uuid) -> RbOption<Json<db::Post>>
         .and_then(|p| Some(Json(p))))
 }
 
+/// Patch a post given its ID.
 #[patch("/<id>", data = "<patch_post>")]
 pub async fn patch(
     _admin: Admin,
@@ -51,6 +55,7 @@ pub async fn patch(
     ))
 }
 
+/// Delete a post given its ID..
 #[delete("/<id>")]
 pub async fn delete(_admin: Admin, conn: RbDbConn, id: uuid::Uuid) -> RbResult<()>
 {

src/v1/sections.rs

@@ -9,6 +9,8 @@ use rocket::serde::json::Json;
 
 use crate::RbDbConn;
 
+/// Get multiple sections given an offset & a limit. The limit is bound by
+/// `rb_blog::db::MAX_SECTIONS`.
 #[get("/?<offset>&<limit>")]
 pub async fn get(conn: RbDbConn, offset: u32, limit: u32) -> RbResult<Json<Vec<db::Section>>>
 {
@@ -18,6 +20,7 @@ pub async fn get(conn: RbDbConn, offset: u32, limit: u32) -> RbResult<Json<Vec<d
     ))
 }
 
+/// Create a new section.
 #[post("/", data = "<new_section>")]
 pub async fn create(
     _admin: Admin,
@@ -31,6 +34,7 @@ pub async fn create(
     ))
 }
 
+/// Get a section by its shortname.
 #[get("/<shortname>")]
 pub async fn find(conn: RbDbConn, shortname: String) -> RbOption<Json<db::Section>>
 {
@@ -40,6 +44,7 @@ pub async fn find(conn: RbDbConn, shortname: String) -> RbOption<Json<db::Sectio
         .and_then(|p| Some(Json(p))))
 }
 
+/// Patch a section given its shortname.
 #[patch("/<shortname>", data = "<patch_section>")]
 pub async fn patch(
     _admin: Admin,
@@ -56,6 +61,7 @@ pub async fn patch(
     ))
 }
 
+/// Delete a section given its ID.
 #[delete("/<id>")]
 pub async fn delete(_admin: Admin, conn: RbDbConn, id: uuid::Uuid) -> RbResult<()>
 {