Add follow instance button in article nav (fixes #31)

src/backend/api/instance.rs

@@ -1,17 +1,18 @@
 use crate::{
     backend::{database::IbisData, error::MyResult, federation::activities::follow::Follow},
-    common::{DbInstance, FollowInstance, InstanceView, LocalUserView, ResolveObject},
+    common::{DbInstance, FollowInstance, GetInstance, InstanceView, LocalUserView, ResolveObject},
 };
 use activitypub_federation::{config::Data, fetch::object_id::ObjectId};
 use axum::{extract::Query, Extension, Form, Json};
 use axum_macros::debug_handler;
 
-/// Retrieve the local instance info.
+/// Retrieve details about an instance. If no id is provided, return local instance.
 #[debug_handler]
-pub(in crate::backend::api) async fn get_local_instance(
+pub(in crate::backend::api) async fn get_instance(
     data: Data<IbisData>,
+    Form(query): Form<GetInstance>,
 ) -> MyResult<Json<InstanceView>> {
-    let local_instance = DbInstance::read_local_view(&data)?;
+    let local_instance = DbInstance::read_view(query.id, &data)?;
     Ok(Json(local_instance))
 }
 

src/backend/api/mod.rs

@@ -11,7 +11,7 @@ use crate::{
                 resolve_article,
                 search_article,
             },
-            instance::{follow_instance, get_local_instance, resolve_instance},
+            instance::{follow_instance, get_instance, resolve_instance},
             user::{
                 get_user,
                 login_user,
@@ -56,7 +56,7 @@ pub fn api_routes() -> Router {
         .route("/article/resolve", get(resolve_article))
         .route("/article/protect", post(protect_article))
         .route("/edit_conflicts", get(edit_conflicts))
-        .route("/instance", get(get_local_instance))
+        .route("/instance", get(get_instance))
         .route("/instance/follow", post(follow_instance))
         .route("/instance/resolve", get(resolve_instance))
         .route("/search", get(search_article))

src/backend/database/instance.rs

@@ -72,8 +72,11 @@ impl DbInstance {
             .get_result(conn.deref_mut())?)
     }
 
-    pub fn read_local_view(data: &Data<IbisData>) -> MyResult<InstanceView> {
-        let instance = DbInstance::read_local_instance(data)?;
+    pub fn read_view(id: Option<i32>, data: &Data<IbisData>) -> MyResult<InstanceView> {
+        let instance = match id {
+            Some(id) => DbInstance::read(id, data),
+            None => DbInstance::read_local_instance(data),
+        }?;
         let followers = DbInstance::read_followers(instance.id, data)?;
 
         Ok(InstanceView {

src/common/mod.rs

@@ -210,6 +210,11 @@ pub struct ForkArticleForm {
     pub new_title: String,
 }
 
+#[derive(Deserialize, Serialize, Debug)]
+pub struct GetInstance {
+    pub id: Option<i32>,
+}
+
 #[derive(Deserialize, Serialize, Debug)]
 pub struct FollowInstance {
     pub id: i32,

src/frontend/api.rs

@@ -11,6 +11,7 @@ use crate::{
         FollowInstance,
         ForkArticleForm,
         GetArticleForm,
+        GetInstance,
         GetUserForm,
         InstanceView,
         ListArticlesForm,
@@ -138,6 +139,10 @@ impl ApiClient {
         self.get_query("/api/v1/instance", None::<i32>).await
     }
 
+    pub async fn get_instance(&self, get_form: &GetInstance) -> MyResult<InstanceView> {
+        self.get_query("/api/v1/instance", Some(get_form)).await
+    }
+
     pub async fn follow_instance_with_resolve(
         &self,
         follow_instance: &str,

src/frontend/app.rs

@@ -81,13 +81,13 @@ impl GlobalState {
 #[component]
 pub fn App() -> impl IntoView {
     provide_meta_context();
-    let backend_hostname = GlobalState {
+    let global_state = GlobalState {
         api_client: ApiClient::new(Client::new(), None),
         my_profile: None,
     };
     // Load user profile in case we are already logged in
     GlobalState::update_my_profile();
-    provide_context(create_rw_signal(backend_hostname));
+    provide_context(create_rw_signal(global_state));
 
     view! {
         <>

src/frontend/components/article_nav.rs

@@ -1,31 +1,47 @@
 use crate::{
-    common::{validation::can_edit_article, ArticleView},
-    frontend::{app::GlobalState, article_link},
+    common::{validation::can_edit_article, ArticleView, GetInstance},
+    frontend::{
+        app::GlobalState,
+        article_link,
+        components::instance_follow_button::InstanceFollowButton,
+    },
 };
 use leptos::*;
 use leptos_router::*;
 
 #[component]
 pub fn ArticleNav(article: Resource<Option<String>, ArticleView>) -> impl IntoView {
-    let global_state = use_context::<RwSignal<GlobalState>>().unwrap();
     view! {
         <Suspense>
-            {move || article.get().map(|article| {
-                let article_link = article_link(&article.article);
+            {move || article.get().map(|article_| {
+                let instance = create_local_resource(move || article_.article.instance_id, move |instance_id| async move {
+                    let form = GetInstance {
+                        id: Some(instance_id)
+                    };
+                    GlobalState::api_client()
+                        .get_instance(&form)
+                        .await
+                        .unwrap()
+                });
+                let global_state = use_context::<RwSignal<GlobalState>>().unwrap();
+                let article_link = article_link(&article_.article);
                 let article_link_ = article_link.clone();
-                let protected = article.article.protected;
+                let protected = article_.article.protected;
                 view!{
                     <nav class="inner">
                         <A href=article_link.clone()>"Read"</A>
                         <A href={format!("{article_link}/history")}>"History"</A>
                         <Show when=move || global_state.with(|state| {
                             let is_admin = state.my_profile.as_ref().map(|p| p.local_user.admin).unwrap_or(false);
-                            state.my_profile.is_some() && can_edit_article(&article.article, is_admin).is_ok()
+                            state.my_profile.is_some() && can_edit_article(&article_.article, is_admin).is_ok()
                         })>
                             <A href={format!("{article_link}/edit")}>"Edit"</A>
                         </Show>
                         <Show when=move || global_state.with(|state| state.my_profile.is_some())>
                             <A href={format!("{article_link_}/actions")}>"Actions"</A>
+                            {instance.get().map(|i|
+                                view!{ <InstanceFollowButton instance=i.instance.clone() /> }
+                            )}
                         </Show>
                         <Show when=move || protected>
                             <span title="Article can only be edited by local admins">"Protected"</span>

src/frontend/components/instance_follow_button.rs

@@ -0,0 +1,39 @@
+use crate::{
+    common::{DbInstance, FollowInstance},
+    frontend::app::GlobalState,
+};
+use leptos::{component, *};
+
+#[component]
+pub fn InstanceFollowButton(instance: DbInstance) -> impl IntoView {
+    let global_state = use_context::<RwSignal<GlobalState>>().unwrap();
+    let follow_action = create_action(move |instance_id: &i32| {
+        let instance_id = *instance_id;
+        async move {
+            let form = FollowInstance { id: instance_id };
+            GlobalState::api_client()
+                .follow_instance(form)
+                .await
+                .unwrap();
+            GlobalState::update_my_profile();
+        }
+    });
+    let is_following = global_state
+        .get_untracked()
+        .my_profile
+        .map(|p| p.following.contains(&instance))
+        .unwrap_or_default();
+    let follow_text = if is_following {
+        "Following instance"
+    } else {
+        "Follow instance"
+    };
+
+    view! {
+        <button on:click=move |_| follow_action.dispatch(instance.id)
+                prop:disabled=move || is_following
+                prop:hidden=move || instance.local>
+            {follow_text}
+        </button>
+    }
+}

src/frontend/components/mod.rs

@@ -1,3 +1,4 @@
 pub mod article_nav;
-pub(crate) mod credentials;
+pub mod credentials;
+pub mod instance_follow_button;
 pub mod nav;

src/frontend/pages/article/history.rs

@@ -1,11 +1,11 @@
 use crate::frontend::{
     article_title,
     components::article_nav::ArticleNav,
+    extract_domain,
     pages::article_resource,
     user_link,
 };
 use leptos::*;
-use crate::frontend::extract_domain;
 
 #[component]
 pub fn ArticleHistory() -> impl IntoView {

src/frontend/pages/instance_details.rs

@@ -1,6 +1,6 @@
 use crate::{
-    common::{utils::http_protocol_str, DbInstance, FollowInstance},
-    frontend::app::GlobalState,
+    common::{utils::http_protocol_str, DbInstance},
+    frontend::{app::GlobalState, components::instance_follow_button::InstanceFollowButton},
 };
 use leptos::*;
 use leptos_router::use_params_map;
@@ -18,36 +18,16 @@ pub fn InstanceDetails() -> impl IntoView {
             .await
             .unwrap()
     });
-    let follow_action = create_action(move |instance_id: &i32| {
-        let instance_id = *instance_id;
-        async move {
-            let form = FollowInstance { id: instance_id };
-            GlobalState::api_client()
-                .follow_instance(form)
-                .await
-                .unwrap();
-            GlobalState::update_my_profile();
-        }
-    });
 
     view! {
         <Suspense fallback=|| view! {  "Loading..." }> {
             move || instance_profile.get().map(|instance: DbInstance| {
                 let instance_ = instance.clone();
-                let is_following = global_state.get().my_profile.map(|p| p.following.contains(&instance_)).unwrap_or_default();
-                let follow_text = if is_following {
-                    "Following"
-                } else {
-                    "Follow"
-                };
                 view! {
                     <h1>{instance.domain}</h1>
 
                     <Show when=move || global_state.with(|state| state.my_profile.is_some())>
-                        <button on:click=move |_| follow_action.dispatch(instance.id)
-                                prop:disabled=move || is_following>
-                            {follow_text}
-                        </button>
+                        <InstanceFollowButton instance=instance_.clone() />
                     </Show>
                     <p>Follow the instance so that new edits are federated to your instance.</p>
                     <p>"TODO: show a list of articles from the instance. For now you can use the "<a href="/article/list">Article list</a>.</p>