Remove encryption logic as it is handled by matrix-sdk e2e-encryption feature directly

matrixgw_backend/src/controllers/matrix/matrix_media_controller.rs

@@ -4,11 +4,9 @@ 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::crypto::{AttachmentDecryptor, MediaEncryptionInfo};
 use matrix_sdk::media::{MediaFormat, MediaRequestParameters, MediaThumbnailSettings};
 use matrix_sdk::ruma::events::room::MediaSource;
 use matrix_sdk::ruma::{OwnedMxcUri, UInt};
-use std::io::{Cursor, Read};
 
 #[derive(serde::Deserialize)]
 pub struct MediaMXCInPath {
@@ -54,21 +52,6 @@ pub async fn serve_media(req: HttpRequest, source: MediaSource, thumbnail: bool)
         )
         .await?;
 
-    // Decrypt file if needed
-    let media = if let MediaSource::Encrypted(file) = source {
-        let mut cursor = Cursor::new(media);
-        let mut decryptor =
-            AttachmentDecryptor::new(&mut cursor, MediaEncryptionInfo::from(*file))?;
-
-        let mut decrypted_data = Vec::new();
-
-        decryptor.read_to_end(&mut decrypted_data)?;
-
-        decrypted_data
-    } else {
-        media
-    };
-
     let digest = sha512(&media);
 
     let mime_type = infer::get(&media).map(|x| x.mime_type());