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README.md

@@ -77,6 +77,7 @@ POST /api/v1/media
 GET /api/v2/search
 POST /api/v1/statuses
 GET /api/v1/statuses/{status_id}
+GET /api/v1/statuses/{status_id}/context
 GET /api/v1/timelines/home
 ```
 

migrations/V0003__post__add_in_reply_to.sql

@@ -0,0 +1 @@
+ALTER TABLE post ADD COLUMN in_reply_to_id UUID REFERENCES post (id) ON DELETE CASCADE;

migrations/schema.sql

@@ -33,6 +33,7 @@ CREATE TABLE post (
     id UUID PRIMARY KEY,
     author_id UUID NOT NULL REFERENCES actor_profile (id) ON DELETE CASCADE,
     content TEXT NOT NULL,
+    in_reply_to_id UUID REFERENCES post (id) ON DELETE CASCADE,
     ipfs_cid VARCHAR(200),
     token_id INTEGER,
     token_tx_id VARCHAR(200),

src/activitypub/receiver.rs

@@ -122,6 +122,8 @@ pub async fn receive_activity(
             }
             let post_data = PostCreateData {
                 content,
+                // TODO: parse inReplyTo field
+                in_reply_to_id: None,
                 attachments: attachments,
                 created_at: object.published,
             };

src/activitypub/vocabulary.rs

@@ -13,4 +13,6 @@ pub const PERSON: &str = "Person";
 pub const DOCUMENT: &str = "Document";
 pub const IMAGE: &str = "Image";
 pub const NOTE: &str = "Note";
+
+// Misc
 pub const PROPERTY_VALUE: &str = "PropertyValue";

src/mastodon_api/statuses/types.rs

@@ -13,6 +13,7 @@ pub struct Status {
     pub created_at: DateTime<Utc>,
     pub account: Account,
     pub content: String,
+    pub in_reply_to_id: Option<Uuid>,
     pub media_attachments: Vec<Attachment>,
 
     // Extra fields
@@ -32,6 +33,7 @@ impl Status {
             created_at: post.created_at,
             account: account,
             content: post.content,
+            in_reply_to_id: post.in_reply_to_id,
             media_attachments: attachments,
             ipfs_cid: post.ipfs_cid,
             token_id: post.token_id,
@@ -47,6 +49,8 @@ pub struct StatusData {
 
     #[serde(rename = "media_ids[]")]
     pub media_ids: Option<Vec<Uuid>>,
+
+    pub in_reply_to_id: Option<Uuid>,
 }
 
 impl From<StatusData> for PostCreateData {
@@ -54,6 +58,7 @@ impl From<StatusData> for PostCreateData {
     fn from(value: StatusData) -> Self {
         Self {
             content: value.status,
+            in_reply_to_id: value.in_reply_to_id,
             attachments: value.media_ids.unwrap_or(vec![]),
             created_at: None,
         }

src/mastodon_api/statuses/views.rs

@@ -14,7 +14,12 @@ use crate::ipfs::store as ipfs_store;
 use crate::ipfs::utils::{IPFS_LOGO, get_ipfs_url};
 use crate::mastodon_api::users::auth::get_current_user;
 use crate::models::profiles::queries::get_followers;
-use crate::models::posts::queries::{create_post, get_post_by_id, update_post};
+use crate::models::posts::queries::{
+    create_post,
+    get_post_by_id,
+    get_thread,
+    update_post,
+};
 use crate::models::posts::types::PostCreateData;
 use super::types::{Status, StatusData};
 
@@ -66,6 +71,20 @@ async fn get_status(
     Ok(HttpResponse::Ok().json(status))
 }
 
+#[get("/{status_id}/context")]
+async fn get_context(
+    config: web::Data<Config>,
+    db_pool: web::Data<Pool>,
+    web::Path(status_id): web::Path<Uuid>,
+) -> Result<HttpResponse, HttpError> {
+    let db_client = &**get_database_client(&db_pool).await?;
+    let statuses: Vec<Status> = get_thread(db_client, &status_id).await?
+        .into_iter()
+        .map(|post| Status::from_post(post, &config.instance_url()))
+        .collect();
+    Ok(HttpResponse::Ok().json(statuses))
+}
+
 // https://docs.opensea.io/docs/metadata-standards
 #[derive(Serialize)]
 struct PostMetadata {
@@ -154,6 +173,7 @@ pub fn status_api_scope() -> Scope {
         .service(create_status)
         // Routes with status ID
         .service(get_status)
+        .service(get_context)
         .service(make_permanent)
         .service(get_signature)
 }

src/models/posts/queries.rs

@@ -13,7 +13,8 @@ pub async fn get_posts(
     db_client: &impl GenericClient,
     current_user_id: &Uuid,
 ) -> Result<Vec<Post>, DatabaseError> {
-    // Select posts from follows + own posts
+    // Select posts from follows + own posts.
+    // Do not select replies
     let rows = db_client.query(
         "
         SELECT
@@ -25,10 +26,13 @@ pub async fn get_posts(
         FROM post
         JOIN actor_profile ON post.author_id = actor_profile.id
         WHERE
-            post.author_id = $1
-            OR EXISTS (
-                SELECT 1 FROM relationship
-                WHERE source_id = $1 AND target_id = post.author_id
+            post.in_reply_to_id IS NULL
+            AND (
+                post.author_id = $1
+                OR EXISTS (
+                    SELECT 1 FROM relationship
+                    WHERE source_id = $1 AND target_id = post.author_id
+                )
             )
         ORDER BY post.created_at DESC
         ",
@@ -76,11 +80,21 @@ pub async fn create_post(
     let created_at = data.created_at.unwrap_or(Utc::now());
     let post_row = transaction.query_one(
         "
-        INSERT INTO post (id, author_id, content, created_at)
-        VALUES ($1, $2, $3, $4)
+        INSERT INTO post (
+            id, author_id, content,
+            in_reply_to_id,
+            created_at
+        )
+        VALUES ($1, $2, $3, $4, $5)
         RETURNING post
         ",
-        &[&post_id, &author_id, &data.content, &created_at],
+        &[
+            &post_id,
+            &author_id,
+            &data.content,
+            &data.in_reply_to_id,
+            &created_at,
+        ],
     ).await?;
     let attachment_rows = transaction.query(
         "
@@ -103,6 +117,7 @@ pub async fn create_post(
         id: db_post.id,
         author: author,
         content: db_post.content,
+        in_reply_to_id: db_post.in_reply_to_id,
         attachments: db_attachments,
         ipfs_cid: db_post.ipfs_cid,
         token_id: db_post.token_id,
@@ -137,6 +152,47 @@ pub async fn get_post_by_id(
     Ok(post)
 }
 
+pub async fn get_thread(
+    db_client: &impl GenericClient,
+    post_id: &Uuid,
+) -> Result<Vec<Post>, DatabaseError> {
+    // TODO: limit recursion depth
+    let rows = db_client.query(
+        "
+        WITH RECURSIVE
+        ancestors (id, in_reply_to_id) AS (
+            SELECT post.id, post.in_reply_to_id FROM post
+            WHERE post.id = $1
+            UNION ALL
+            SELECT post.id, post.in_reply_to_id FROM post
+            JOIN ancestors ON post.id = ancestors.in_reply_to_id
+        ),
+        context (id, path) AS (
+            SELECT ancestors.id, ARRAY[ancestors.id] FROM ancestors
+            WHERE ancestors.in_reply_to_id IS NULL
+            UNION
+            SELECT post.id, array_append(context.path, post.id) FROM post
+            JOIN context ON post.in_reply_to_id = context.id
+        )
+        SELECT
+            post, actor_profile,
+            ARRAY(
+                SELECT media_attachment
+                FROM media_attachment WHERE post_id = post.id
+            ) AS attachments
+        FROM post
+        JOIN context ON post.id = context.id
+        JOIN actor_profile ON post.author_id = actor_profile.id
+        ORDER BY context.path
+        ",
+        &[&post_id],
+    ).await?;
+    let posts: Vec<Post> = rows.iter()
+        .map(|row| Post::try_from(row))
+        .collect::<Result<_, _>>()?;
+    Ok(posts)
+}
+
 pub async fn get_post_by_ipfs_cid(
     db_client: &impl GenericClient,
     ipfs_cid: &str,

src/models/posts/types.rs

@@ -16,6 +16,7 @@ pub struct DbPost {
     pub id: Uuid,
     pub author_id: Uuid,
     pub content: String,
+    pub in_reply_to_id: Option<Uuid>,
     pub ipfs_cid: Option<String>,
     pub token_id: Option<i32>,
     pub token_tx_id: Option<String>,
@@ -27,6 +28,7 @@ pub struct Post {
     pub id: Uuid,
     pub author: DbActorProfile,
     pub content: String,
+    pub in_reply_to_id: Option<Uuid>,
     pub attachments: Vec<DbMediaAttachment>,
     pub ipfs_cid: Option<String>,
     pub token_id: Option<i32>,
@@ -46,6 +48,7 @@ impl TryFrom<&Row> for Post {
             id: db_post.id,
             author: db_profile,
             content: db_post.content,
+            in_reply_to_id: db_post.in_reply_to_id,
             attachments: db_attachments,
             ipfs_cid: db_post.ipfs_cid,
             token_id: db_post.token_id,
@@ -58,6 +61,7 @@ impl TryFrom<&Row> for Post {
 
 pub struct PostCreateData {
     pub content: String,
+    pub in_reply_to_id: Option<Uuid>,
     pub attachments: Vec<Uuid>,
     pub created_at: Option<DateTime<Utc>>,
 }
@@ -83,6 +87,7 @@ mod tests {
     fn test_validate_post_data() {
         let mut post_data_1 = PostCreateData {
             content: "  ".to_string(),
+            in_reply_to_id: None,
             attachments: vec![],
             created_at: None,
         };
@@ -93,6 +98,7 @@ mod tests {
     fn test_trimming() {
         let mut post_data_2 = PostCreateData {
             content: "test ".to_string(),
+            in_reply_to_id: None,
             attachments: vec![],
             created_at: None,
         };