Correctly indicate markdown mediaType for apub objects (ref #1220)

docs/src/contributing_apub_api_outline.md

@@ -64,6 +64,7 @@ Receives activities from user: `Follow`, `Undo/Follow`, `Create`, `Update`, `Lik
         "https://enterprise.lemmy.ml/u/riker"
     ],
     "content": "Welcome to the default community!",
+    "mediaType": "text/markdown",
     "icon": {
         "type": "Image",
         "url": "https://enterprise.lemmy.ml/pictrs/image/Z8pFFb21cl.png"
@@ -123,7 +124,8 @@ Sends and receives activities from/to other users: `Create/Note`, `Update/Note`,
     "type": "Person",
     "preferredUsername": "picard",
     "name": "Jean-Luc Picard",
-    "summary": "The user bio",
+    "content": "The user bio",
+    "mediaType": "text/markdown",
     "icon": {
         "type": "Image",
         "url": "https://enterprise.lemmy.ml/pictrs/image/DS3q0colRA.jpg"
@@ -150,7 +152,7 @@ Sends and receives activities from/to other users: `Create/Note`, `Update/Note`,
 |---|---|---|
 | `preferredUsername` | yes | Name of the actor |
 | `name` | no | The user's displayname |
-| `summary` | no | User bio |
+| `content` | no | User bio |
 | `icon` | no | The user's avatar, shown next to the username |
 | `image` | no | The user's banner, shown on top of the profile |
 | `inbox` | no | ActivityPub inbox URL |
@@ -174,6 +176,7 @@ A page with title, and optional URL and text content. The URL often leads to an
     "to": "https://voyager.lemmy.ml/c/main",
     "summary": "Test thumbnail 2",
     "content": "blub blub",
+    "mediaType": "text/markdown",
     "url": "https://voyager.lemmy.ml:/pictrs/image/fzGwCsq7BJ.jpg",
     "image": {
         "type": "Image",
@@ -213,6 +216,7 @@ A reply to a post, or reply to another comment. Contains only text (including re
     "attributedTo": "https://enterprise.lemmy.ml/u/picard",
     "to": "https://enterprise.lemmy.ml/c/main",
     "content": "mmmk",
+    "mediaType": "text/markdown",
     "inReplyTo": [
         "https://enterprise.lemmy.ml/post/38",
         "https://voyager.lemmy.ml/comment/73"
@@ -243,6 +247,7 @@ A direct message from one user to another. Can not include additional users. Thr
     "attributedTo": "https://enterprise.lemmy.ml/u/picard",
     "to": "https://voyager.lemmy.ml/u/janeway",
     "content": "test",
+    "mediaType": "text/markdown",
     "published": "2020-10-08T19:10:46.542820+00:00",
     "updated": "2020-10-08T20:13:52.547156+00:00"
 }

lemmy_apub/src/objects/comment.rs

@@ -4,7 +4,7 @@ use crate::{
     get_or_fetch_and_insert_post,
     get_or_fetch_and_upsert_user,
   },
-  objects::{check_object_domain, create_tombstone},
+  objects::{check_is_markdown, check_object_domain, create_tombstone, mime_markdown},
   FromApub,
   ToApub,
 };
@@ -64,6 +64,7 @@ impl ToApub for Comment {
       .set_to(community.actor_id)
       .set_many_in_reply_tos(in_reply_to_vec)
       .set_content(self.content.to_owned())
+      .set_media_type(mime_markdown()?)
       .set_attributed_to(creator.actor_id);
 
     if let Some(u) = self.updated {
@@ -124,6 +125,9 @@ impl FromApub for CommentForm {
       }
       None => None,
     };
+
+    check_is_markdown(note.media_type())?;
+
     let content = note
       .content()
       .context(location_info!())?

lemmy_apub/src/objects/community.rs

@@ -1,7 +1,7 @@
 use crate::{
   extensions::group_extensions::GroupExtension,
   fetcher::get_or_fetch_and_upsert_user,
-  objects::{check_object_domain, create_tombstone},
+  objects::{check_is_markdown, check_object_domain, create_tombstone, mime_markdown},
   ActorType,
   FromApub,
   GroupExt,
@@ -58,9 +58,7 @@ impl ToApub for Community {
       group.set_updated(convert_datetime(u));
     }
     if let Some(d) = self.description.to_owned() {
-      // TODO: this should be html, also add source field with raw markdown
-      //       -> same for post.content and others
-      group.set_content(d);
+      group.set_content(d).set_media_type(mime_markdown()?);
     }
 
     if let Some(icon_url) = &self.icon {
@@ -146,6 +144,10 @@ impl FromApub for CommunityForm {
       .map(|s| s.as_single_xsd_string())
       .flatten()
       .map(|s| s.to_string());
+    if description.is_some() {
+      check_is_markdown(group.media_type())?;
+    }
+
     check_slurs(&name)?;
     check_slurs(&title)?;
     check_slurs_opt(&description)?;

lemmy_apub/src/objects/mod.rs

@@ -2,6 +2,7 @@ use crate::check_is_apub_id_valid;
 use activitystreams::{
   base::{AsBase, BaseExt},
   markers::Base,
+  mime::{FromStrError, Mime},
   object::{Tombstone, TombstoneExt},
 };
 use anyhow::{anyhow, Context};
@@ -58,3 +59,18 @@ where
   };
   Ok(actor_id.to_string())
 }
+
+pub(in crate::objects) fn mime_markdown() -> Result<Mime, FromStrError> {
+  "text/markdown".parse()
+}
+
+pub(in crate::objects) fn check_is_markdown(mime: Option<&Mime>) -> Result<(), LemmyError> {
+  let mime = mime.context(location_info!())?;
+  if !mime.eq(&mime_markdown()?) {
+    Err(LemmyError::from(anyhow!(
+      "Lemmy only supports markdown content"
+    )))
+  } else {
+    Ok(())
+  }
+}

lemmy_apub/src/objects/post.rs

@@ -1,7 +1,7 @@
 use crate::{
   extensions::page_extension::PageExtension,
   fetcher::{get_or_fetch_and_upsert_community, get_or_fetch_and_upsert_user},
-  objects::{check_object_domain, create_tombstone},
+  objects::{check_is_markdown, check_object_domain, create_tombstone, mime_markdown},
   FromApub,
   PageExt,
   ToApub,
@@ -57,7 +57,9 @@ impl ToApub for Post {
       .set_attributed_to(creator.actor_id);
 
     if let Some(body) = &self.body {
-      page.set_content(body.to_owned());
+      page
+        .set_content(body.to_owned())
+        .set_media_type(mime_markdown()?);
     }
 
     // TODO: hacky code because we get self.url == Some("")
@@ -162,6 +164,7 @@ impl FromApub for PostForm {
       .as_single_xsd_string()
       .context(location_info!())?
       .to_string();
+
     let body = page
       .inner
       .content()
@@ -169,6 +172,10 @@ impl FromApub for PostForm {
       .map(|c| c.as_single_xsd_string())
       .flatten()
       .map(|s| s.to_string());
+    if body.is_some() {
+      check_is_markdown(page.media_type())?;
+    }
+
     check_slurs(&name)?;
     let body_slurs_removed = body.map(|b| remove_slurs(&b));
     Ok(PostForm {

lemmy_apub/src/objects/private_message.rs

@@ -1,7 +1,7 @@
 use crate::{
   check_is_apub_id_valid,
   fetcher::get_or_fetch_and_upsert_user,
-  objects::{check_object_domain, create_tombstone},
+  objects::{check_is_markdown, check_object_domain, create_tombstone, mime_markdown},
   FromApub,
   ToApub,
 };
@@ -39,6 +39,7 @@ impl ToApub for PrivateMessage {
       .set_id(Url::parse(&self.ap_id.to_owned())?)
       .set_published(convert_datetime(self.published))
       .set_content(self.content.to_owned())
+      .set_media_type(mime_markdown()?)
       .set_to(recipient.actor_id)
       .set_attributed_to(creator.actor_id);
 
@@ -83,6 +84,8 @@ impl FromApub for PrivateMessageForm {
     let ap_id = note.id_unchecked().context(location_info!())?.to_string();
     check_is_apub_id_valid(&Url::parse(&ap_id)?)?;
 
+    check_is_markdown(note.media_type())?;
+
     Ok(PrivateMessageForm {
       creator_id: creator.id,
       recipient_id: recipient.id,

lemmy_apub/src/objects/user.rs

@@ -1,4 +1,10 @@
-use crate::{objects::check_object_domain, ActorType, FromApub, PersonExt, ToApub};
+use crate::{
+  objects::{check_is_markdown, check_object_domain, mime_markdown},
+  ActorType,
+  FromApub,
+  PersonExt,
+  ToApub,
+};
 use activitystreams::{
   actor::{ApActor, Endpoints, Person},
   object::{Image, Tombstone},
@@ -47,7 +53,12 @@ impl ToApub for User_ {
     }
 
     if let Some(bio) = &self.bio {
-      person.set_summary(bio.to_owned());
+      // Use `content` here because it supports markdown, while summary does not.
+      person
+        .set_content(bio.to_owned())
+        .set_media_type(mime_markdown()?)
+        // Also set summary for compatibility with older Lemmy versions. Remove this after a while.
+        .set_summary(bio.to_owned());
     }
 
     if let Some(i) = self.preferred_username.to_owned() {
@@ -121,10 +132,14 @@ impl FromApub for UserForm {
     // here when we federate to other platforms. Same for preferred_username
     let bio = person
       .inner
-      .summary()
+      .content()
       .map(|s| s.as_single_xsd_string())
       .flatten()
       .map(|s| s.to_string());
+    if bio.is_some() {
+      check_is_markdown(person.media_type())?;
+    }
+
     check_slurs(&name)?;
     check_slurs_opt(&preferred_username)?;
     check_slurs_opt(&bio)?;