Add part5

part5/src/Data/UserPhoto.elm

@@ -0,0 +1,45 @@
+module Data.UserPhoto exposing (UserPhoto, decoder, encode, src, toMaybeString)
+
+import Html exposing (Attribute)
+import Html.Attributes
+import Json.Decode as Decode exposing (Decoder)
+import Json.Encode as Encode exposing (Value)
+import Json.Encode.Extra as EncodeExtra
+
+
+type UserPhoto
+    = UserPhoto (Maybe String)
+
+
+src : UserPhoto -> Attribute msg
+src =
+    photoToUrl >> Html.Attributes.src
+
+
+decoder : Decoder UserPhoto
+decoder =
+    Decode.map UserPhoto (Decode.nullable Decode.string)
+
+
+encode : UserPhoto -> Value
+encode (UserPhoto maybeUrl) =
+    EncodeExtra.maybe Encode.string maybeUrl
+
+
+toMaybeString : UserPhoto -> Maybe String
+toMaybeString (UserPhoto maybeUrl) =
+    maybeUrl
+
+
+
+-- INTERNAL --
+
+
+photoToUrl : UserPhoto -> String
+photoToUrl (UserPhoto maybeUrl) =
+    case maybeUrl of
+        Nothing ->
+            "https://static.productionready.io/images/smiley-cyrus.jpg"
+
+        Just url ->
+            url