Prototype for MSC2448

include/mtx/events/common.hpp

@@ -55,6 +55,8 @@ struct ImageInfo
         std::string mimetype;
         //! Encryption members. If present, they replace thumbnail_url.
         std::optional<crypto::EncryptedFile> thumbnail_file;
+        //! experimental blurhash, see MSC2448
+        std::string blurhash;
 };
 
 //! Deserialization method needed by @p nlohmann::json.
@@ -126,6 +128,8 @@ struct VideoInfo
         ThumbnailInfo thumbnail_info;
         //! Encryption members. If present, they replace thumbnail_url.
         std::optional<crypto::EncryptedFile> thumbnail_file;
+        //! experimental blurhash, see MSC2448
+        std::string blurhash;
 };
 
 //! Deserialization method needed by @p nlohmann::json.

lib/structs/events/common.cpp

@@ -55,6 +55,9 @@ from_json(const json &obj, ImageInfo &info)
 
         if (obj.find("thumbnail_file") != obj.end())
                 info.thumbnail_file = obj.at("thumbnail_file").get<crypto::EncryptedFile>();
+
+        if (obj.find("xyz.amorgan.blurhash") != obj.end())
+                info.blurhash = obj.at("xyz.amorgan.blurhash").get<std::string>();
 }
 
 void
@@ -70,6 +73,8 @@ to_json(json &obj, const ImageInfo &info)
         }
         if (info.thumbnail_file)
                 obj["thumbnail_file"] = info.thumbnail_file.value();
+        if (!info.blurhash.empty())
+                obj["xyz.amorgan.blurhash"] = info.blurhash;
 }
 
 void
@@ -151,6 +156,9 @@ from_json(const json &obj, VideoInfo &info)
 
         if (obj.find("thumbnail_file") != obj.end())
                 info.thumbnail_file = obj.at("thumbnail_file").get<crypto::EncryptedFile>();
+
+        if (obj.find("xyz.amorgan.blurhash") != obj.end())
+                info.blurhash = obj.at("xyz.amorgan.blurhash").get<std::string>();
 }
 
 void
@@ -160,11 +168,15 @@ to_json(json &obj, const VideoInfo &info)
         obj["h"]        = info.h;
         obj["w"]        = info.w;
         obj["duration"] = info.duration;
+        obj["mimetype"] = info.mimetype;
+        if (!info.thumbnail_url.empty()) {
                 obj["thumbnail_url"]  = info.thumbnail_url;
                 obj["thumbnail_info"] = info.thumbnail_info;
-        obj["mimetype"]       = info.mimetype;
+        }
         if (info.thumbnail_file)
                 obj["thumbnail_file"] = info.thumbnail_file.value();
+        if (!info.blurhash.empty())
+                obj["xyz.amorgan.blurhash"] = info.blurhash;
 }
 
 void