Implement VisibleMessage.fromProto(_:)

SessionMessagingKit/Messages/Visible Message/VisibleMessage.swift

@@ -8,6 +8,9 @@ public final class VisibleMessage : Message {
     public var contact: Contact?
     public var profile: Profile?
 
+    // MARK: Initialization
+    public override init() { super.init() }
+
     // MARK: Coding
     public required init?(coder: NSCoder) {
         super.init(coder: coder)
@@ -23,7 +26,15 @@ public final class VisibleMessage : Message {
 
     // MARK: Proto Conversion
     public override class func fromProto(_ proto: SNProtoContent) -> VisibleMessage? {
-        return nil
+        guard let dataMessage = proto.dataMessage else { return nil }
+        let result = VisibleMessage()
+        result.text = dataMessage.body
+        result.attachmentIDs = [] // TODO
+        if let quoteProto = dataMessage.quote, let quote = Quote.fromProto(quoteProto) { result.quote = quote }
+        if let linkPreviewProto = dataMessage.preview.first, let linkPreview = LinkPreview.fromProto(linkPreviewProto) { result.linkPreview = linkPreview }
+        // TODO: Contact
+        if let profile = Profile.fromProto(dataMessage) { result.profile = profile }
+        return result
     }
 
     public override func toProto() -> SNProtoContent? {