API change: deprecate Gravatar.

Include avatar information in user object.

src/database/entities/autumn.rs

@@ -1,5 +1,9 @@
+use mongodb::bson::{doc, from_document};
 use serde::{Deserialize, Serialize};
 
+use crate::util::result::{Error, Result};
+use crate::database::*;
+
 #[derive(Serialize, Deserialize, Debug, Clone)]
 #[serde(tag = "type")]
 enum Metadata {
@@ -32,3 +36,54 @@ pub struct File {
     #[serde(skip_serializing_if = "Option::is_none")]
     object_id: Option<String>,
 }
+
+impl File {
+    pub async fn find_and_use(attachment_id: &str, tag: &str, parent_type: &str, parent_id: &str) -> Result<File> {
+        let attachments = get_collection("attachments");
+        let key = format!("{}_id", parent_type);
+        if let Some(doc) = attachments
+            .find_one(
+                doc! {
+                    "_id": attachment_id,
+                    "tag": &tag,
+                    key.clone(): {
+                        "$exists": false
+                    }
+                },
+                None,
+            )
+            .await
+            .map_err(|_| Error::DatabaseError {
+                operation: "find_one",
+                with: "attachment",
+            })?
+        {
+            let attachment = from_document::<File>(doc).map_err(|_| Error::DatabaseError {
+                operation: "from_document",
+                with: "attachment",
+            })?;
+
+            attachments
+                .update_one(
+                    doc! {
+                        "_id": &attachment.id
+                    },
+                    doc! {
+                        "$set": {
+                            key: &parent_id
+                        }
+                    },
+                    None,
+                )
+                .await
+                .map_err(|_| Error::DatabaseError {
+                    operation: "update_one",
+                    with: "attachment",
+                })?;
+
+            Ok(attachment)
+        } else {
+            Err(Error::UnknownAttachment)
+        }
+    }
+}

src/database/entities/user.rs

@@ -63,6 +63,8 @@ pub struct User {
     pub id: String,
     pub username: String,
     #[serde(skip_serializing_if = "Option::is_none")]
+    pub avatar: Option<File>,
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub relations: Option<Vec<Relationship>>,
 
     #[serde(skip_serializing_if = "Option::is_none")]