add exercise - saving files

Author: dipamsen

…se_08_save_files/image_1558376232234.png …ave_files/images/image_1558376232234.pngmodule2/exercise_08_save_files/image_1558376232234.png renamed to module2/exercise_08_save_files/images/image_1558376232234.png module2/exercise_08_save_files/image_1558376232234.png renamed to module2/exercise_08_save_files/images/image_1558376232234.png

@@ -0,0 +1,34 @@
+constexpress=require("express");
+constDatastore=require("nedb");
+constfs=require("fs");
+
+constapp=express();
+app.listen(3000,()=>console.log("listening at 3000"));
+app.use(express.static("public"));
+app.use("/img",express.static("images"));
+app.use(express.json({limit: "1mb"}));
+
+constdatabase=newDatastore("database.db");
+database.loadDatabase();
+
+app.get("/api",(request,response)=>{
+database.find({},(err,data)=>{
+if(err){
+response.end();
+return;
+}
+response.json(data);
+});
+});
+
+app.post("/api",(request,response)=>{
+constdata=request.body;
+consttimestamp=Date.now();
+data.timestamp=timestamp;
+data.image_file=`image_${timestamp}.png`;
+constbase64Data=data.image64.replace(/^data:image\/png;base64,/,"");
+fs.writeFileSync(`images/${data.image_file}`,base64Data,"base64");
+deletedata.image64;
+database.insert(data);
+response.json(data);
+});