feat(plugin-upload): adding findOne endpoint

packages/strapi-plugin-upload/config/routes.json

@@ -40,6 +40,14 @@
         "policies": []
       }
     },
+    {
+      "method": "GET",
+      "path": "/files/:_id",
+      "handler": "Upload.findOne",
+      "config": {
+        "policies": []
+      }
+    },
     {
       "method": "GET",
       "path": "/files/count",

packages/strapi-plugin-upload/controllers/Upload.js

@@ -123,6 +123,15 @@ module.exports = {
     }));
   },
 
+  findOne: async (ctx) => {
+    const data = await strapi.plugins['upload'].services.upload.fetch(ctx.params);
+
+    data.url = strapi.config.url + data.url;
+
+    // Send 200 `ok`
+    ctx.send(data);
+  },
+
   count: async (ctx, next) => {
     const data = await strapi.plugins['upload'].services.upload.count(ctx.query);