Can get room avatar

matrixgw_backend/Cargo.lock

@@ -777,6 +777,17 @@ version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4f4c707c6a209cbe82d10abd08e1ea8995e9ea937d2550646e02798948992be0"
 
+[[package]]
+name = "cfb"
+version = "0.7.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d38f2da7a0a2c4ccf0065be06397cc26a81f4e528be095826eee9d4adbb8c60f"
+dependencies = [
+ "byteorder",
+ "fnv",
+ "uuid",
+]
+
 [[package]]
 name = "cfg-if"
 version = "1.0.4"
@@ -2357,6 +2368,15 @@ dependencies = [
  "serde_core",
 ]
 
+[[package]]
+name = "infer"
+version = "0.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a588916bfdfd92e71cacef98a63d9b1f0d74d6599980d11894290e7ddefffcf7"
+dependencies = [
+ "cfb",
+]
+
 [[package]]
 name = "inout"
 version = "0.1.4"
@@ -3048,6 +3068,7 @@ dependencies = [
  "env_logger",
  "futures-util",
  "hex",
+ "infer",
  "ipnet",
  "jwt-simple",
  "lazy-regex",

matrixgw_backend/Cargo.toml

@@ -33,3 +33,4 @@ ractor = "0.15.9"
 serde_json = "1.0.145"
 lazy-regex = "3.4.2"
 actix-ws = "0.3.0"
+infer = "0.19.0"

matrixgw_backend/src/controllers/matrix/matrix_room_controller.rs

@@ -1,6 +1,7 @@
 use crate::controllers::HttpResult;
+use crate::controllers::matrix::media_controller;
 use crate::extractors::matrix_client_extractor::MatrixClientExtractor;
-use actix_web::{HttpResponse, web};
+use actix_web::{HttpRequest, HttpResponse, web};
 use futures_util::{StreamExt, stream};
 use matrix_sdk::ruma::{OwnedRoomId, OwnedUserId};
 use matrix_sdk::{Room, RoomMemberships};
@@ -56,3 +57,20 @@ pub async fn single_room_info(
         Some(r) => HttpResponse::Ok().json(APIRoomInfo::from_room(&r).await?),
     })
 }
+
+/// Get room avatar
+pub async fn room_avatar(
+    req: HttpRequest,
+    client: MatrixClientExtractor,
+    path: web::Path<RoomIdInPath>,
+) -> HttpResult {
+    let Some(room) = client.client.client.get_room(&path.id) else {
+        return Ok(HttpResponse::NotFound().json("Room not found"));
+    };
+
+    let Some(uri) = room.avatar_url() else {
+        return Ok(HttpResponse::NotFound().json("Room has no avatar"));
+    };
+
+    media_controller::serve_media(req, uri).await
+}

matrixgw_backend/src/controllers/matrix/media_controller.rs

@@ -0,0 +1,57 @@
+use crate::controllers::HttpResult;
+use crate::extractors::matrix_client_extractor::MatrixClientExtractor;
+use crate::utils::crypt_utils::sha512;
+use actix_web::dev::Payload;
+use actix_web::http::header;
+use actix_web::{FromRequest, HttpRequest, HttpResponse, web};
+use matrix_sdk::media::{MediaFormat, MediaRequestParameters, MediaThumbnailSettings};
+use matrix_sdk::ruma::events::room::MediaSource;
+use matrix_sdk::ruma::{OwnedMxcUri, UInt};
+
+#[derive(serde::Deserialize)]
+struct MediaQuery {
+    #[serde(default)]
+    thumbnail: bool,
+}
+
+/// Serve a media file
+pub async fn serve_media(req: HttpRequest, media: OwnedMxcUri) -> HttpResult {
+    let query = web::Query::<MediaQuery>::from_request(&req, &mut Payload::None).await?;
+    let client = MatrixClientExtractor::from_request(&req, &mut Payload::None).await?;
+
+    let media = client
+        .client
+        .client
+        .media()
+        .get_media_content(
+            &MediaRequestParameters {
+                source: MediaSource::Plain(media),
+                format: match query.thumbnail {
+                    true => MediaFormat::Thumbnail(MediaThumbnailSettings::new(
+                        UInt::new(100).unwrap(),
+                        UInt::new(100).unwrap(),
+                    )),
+                    false => MediaFormat::File,
+                },
+            },
+            true,
+        )
+        .await?;
+
+    let digest = sha512(&media);
+
+    let mime_type = infer::get(&media).map(|x| x.mime_type());
+
+    // Check if the browser already knows the etag
+    if let Some(c) = req.headers().get(header::IF_NONE_MATCH)
+        && c.to_str().unwrap_or("") == digest
+    {
+        return Ok(HttpResponse::NotModified().finish());
+    }
+
+    Ok(HttpResponse::Ok()
+        .content_type(mime_type.unwrap_or("application/octet-stream"))
+        .insert_header(("etag", digest))
+        .insert_header(("cache-control", "max-age=360000"))
+        .body(media))
+}

matrixgw_backend/src/controllers/matrix/mod.rs

@@ -1 +1,2 @@
 pub mod matrix_room_controller;
+pub mod media_controller;

matrixgw_backend/src/controllers/mod.rs

@@ -22,6 +22,8 @@ pub enum HttpFailure {
     InternalError(#[from] anyhow::Error),
     #[error("Actix web error: {0}")]
     ActixError(#[from] actix_web::Error),
+    #[error("Matrix error: {0}")]
+    MatrixError(#[from] matrix_sdk::Error),
 }
 
 impl ResponseError for HttpFailure {

matrixgw_backend/src/main.rs

@@ -144,6 +144,10 @@ async fn main() -> std::io::Result<()> {
                 "/api/matrix/room/{id}",
                 web::get().to(matrix_room_controller::single_room_info),
             )
+            .route(
+                "/api/matrix/room/{id}/avatar",
+                web::get().to(matrix_room_controller::room_avatar),
+            )
     })
     .workers(4)
     .bind(&AppConfig::get().listen_address)?

matrixgw_backend/src/utils/crypt_utils.rs

@@ -1,6 +1,11 @@
-use sha2::{Digest, Sha256};
+use sha2::{Digest, Sha256, Sha512};
 
 /// Compute SHA256sum of a given string
 pub fn sha256str(input: &str) -> String {
     hex::encode(Sha256::digest(input.as_bytes()))
 }
+
+/// Compute SHA256sum of a given byte array
+pub fn sha512(input: &[u8]) -> String {
+    hex::encode(Sha512::digest(input))
+}