Added missing properties for attachments.

common/src/main/kotlin/entity/DiscordMessage.kt

@@ -426,6 +426,8 @@ fun MessageFlags(flags: Iterable<MessageFlags>) = MessageFlags {
  *
  * @param id The attachment id.
  * @param filename The name of the attached file.
+ * @param description The description for the file.
+ * @param contentType The attachment's [media type](https://en.wikipedia.org/wiki/Media_type).
  * @param size The size of the file in bytes.
  * @param url The source url of the file.
  * @param proxyUrl A proxied url of the field.
@@ -436,6 +438,9 @@ fun MessageFlags(flags: Iterable<MessageFlags>) = MessageFlags {
 data class DiscordAttachment(
     val id: Snowflake,
     val filename: String,
+    val description: Optional<String> = Optional.Missing(),
+    @SerialName("content_type")
+    val contentType: Optional<String> = Optional.Missing(),
     val size: Int,
     val url: String,
     @SerialName("proxy_url")

core/src/main/kotlin/cache/data/AttachmentData.kt

@@ -2,6 +2,7 @@ package dev.kord.core.cache.data
 
 import dev.kord.common.entity.DiscordAttachment
 import dev.kord.common.entity.Snowflake
+import dev.kord.common.entity.optional.Optional
 import dev.kord.common.entity.optional.OptionalBoolean
 import dev.kord.common.entity.optional.OptionalInt
 import kotlinx.serialization.Serializable
@@ -10,6 +11,8 @@ import kotlinx.serialization.Serializable
 public data class AttachmentData(
     val id: Snowflake,
     val filename: String,
+    val description: Optional<String> = Optional.Missing(),
+    val contentType: Optional<String> = Optional.Missing(),
     val size: Int,
     val url: String,
     val proxyUrl: String,
@@ -19,7 +22,7 @@ public data class AttachmentData(
 ) {
     public companion object {
         public fun from(entity: DiscordAttachment): AttachmentData = with(entity) {
-            AttachmentData(id, filename, size, url, proxyUrl, height, width, ephemeral)
+            AttachmentData(id, filename, description, contentType, size, url, proxyUrl, height, width, ephemeral)
         }
     }
 }

core/src/main/kotlin/entity/Attachment.kt

@@ -23,6 +23,16 @@ public data class Attachment(val data: AttachmentData, override val kord: Kord)
      */
     val filename: String get() = data.filename
 
+    /**
+     * The description for the file.
+     */
+    val description: String? get() = data.description.value
+
+    /**
+     * The attachment's [media type](https://en.wikipedia.org/wiki/Media_type).
+     */
+    val contentType: String? get() = data.contentType.value
+
     /**
      * The size of the file in bytes.
      */
@@ -73,6 +83,6 @@ public data class Attachment(val data: AttachmentData, override val kord: Kord)
 
 public fun Attachment.toRawType(): DiscordAttachment {
     with(data) {
-        return DiscordAttachment(id, filename, size, url, proxyUrl, height, width)
+        return DiscordAttachment(id, filename, description, contentType, size, url, proxyUrl, height, width)
     }
 }