Add embed and image definitions to post lexicon

Author: erikologic

lexicons/app/flashes/feed/post.json

@@ -17,6 +17,10 @@
             "description": "The primary post content. May be an empty string, if there are embeds."
           },
           "reply": { "type": "ref", "ref": "#replyRef" },
+          "embed": {
+            "type": "ref",
+            "ref": "#embedImages"
+          },
           "langs": {
             "type": "array",
             "description": "Indicates human language of post primary text content.",
@@ -49,6 +53,34 @@
         "root": { "type": "ref", "ref": "com.atproto.repo.strongRef" },
         "parent": { "type": "ref", "ref": "com.atproto.repo.strongRef" }
       }
+    },
+    "embedImages": {
+      "type": "object",
+      "required": ["images"],
+      "properties": {
+        "images": {
+          "type": "array",
+          "items": { "type": "ref", "ref": "#image" },
+          "maxLength": 4
+        }
+      }
+    },
+    "image": {
+      "type": "object",
+      "required": ["image", "alt"],
+      "properties": {
+        "image": { "type": "blob", "accept": ["image/*"], "maxSize": 1000000 },
+        "alt": { "type": "string", "maxGraphemes": 1000, "maxLength": 10000 },
+        "aspectRatio": { "type": "ref", "ref": "#aspectRatio" }
+      }
+    },
+    "aspectRatio": {
+      "type": "object",
+      "required": ["width", "height"],
+      "properties": {
+        "width": { "type": "integer", "minimum": 1 },
+        "height": { "type": "integer", "minimum": 1 }
+      }
     }
   }
 }