Adding random image web source and making it as default one.

src/Common/Utils.cs

@@ -3,6 +3,7 @@
 using System.IO;
 using System.Reflection;
 using System.Linq;
+using System.Net;
 
 namespace Common
 {
@@ -29,6 +30,15 @@ internal static string GetExeFolder()
             return Path.GetDirectoryName(path);
         }
 
+        internal static string DownloadUrlToDisk(string url)
+        {
+            WebClient wc = new WebClient();
+            string pathToSave = Utils.GetExeFolder() + "/wallpaper.jpg";
+            wc.DownloadFile(url, pathToSave);
+
+            return pathToSave;
+        }
+
         static Dictionary<string,Type> GetSourcesMap()
         {
             Dictionary<string,Type> map = new Dictionary<string, Type>();

src/Program.cs

@@ -12,7 +12,7 @@ static void Main(string[] args)
             if(args.Length == 0)
             {
                 //Select a random source and set wallpaper
-                Wallpaper.SetWallpaperFromSource(Common.Utils.sourceMap.Keys.First());
+                Wallpaper.SetWallpaperFromSource("RandomFromWeb");
             }
             else
             {
@@ -28,8 +28,23 @@ static void Main(string[] args)
                             Console.WriteLine("\t" + sourceName);
                         }
                         break;
-                    case "-u":
+                    case "-s":
                         //set wallpaper from specified source
+                        if (args.Length < 2)
+                            Console.WriteLine("Source not specified");
+                        else if (args.Length > 2)
+                            Console.WriteLine("Invalid number of arguments\n correct format is wallpaper -s SOURCENAME");
+                        else
+                        {
+                            string usrSel = args[1];
+                            //check if this is a valid source name
+                            if (!Common.Utils.sourceMap.Keys.Contains(usrSel))
+                                Console.WriteLine("Soruce {0} not found. \n To view list of valid sources run : wallpaper -ls");
+                            else
+                                Wallpaper.SetWallpaperFromSource(usrSel);
+                        }
+
+                        break;
                     default:
                         //display help
                         break;

src/Sources/Bing.cs

@@ -15,10 +15,9 @@ public string DownloadWallpaper()
 
             JObject result = JObject.Parse(jsonString);
             string imgURL = "http://bing.com" + result["images"][0]["url"].ToString();
-            string pathToSave = Utils.GetExeFolder() + "/wallpaper.jpg";
-            wc.DownloadFile(imgURL, pathToSave);
+
 
-            return pathToSave;
+            return Utils.DownloadUrlToDisk(imgURL);
         }
 
         public string Name()

src/Sources/RandomWeb.cs

@@ -0,0 +1,52 @@
+using Common;
+using System;
+using System.Collections.Generic;
+using System.Text.RegularExpressions;
+using System.Linq;
+using System.Net.Http;
+
+namespace Sources
+{
+    public class RandomWeb : IWallpaperSource
+    {
+        //FUTURE : We can make this user configurable, so that user can define own wallpaper topics to search internet from
+        string[] topics = new string[] { "Mountains", "Birds", "Nature", "Sunset", "Galaxy", "Rivers", "Flowers", "Animals", "Abstract" };
+
+        public string DownloadWallpaper()
+        {
+            //Pick a random item from the topics array
+            Random randomGen = new Random();
+            int topicNo = randomGen.Next(0, topics.Length - 1);
+            string topic = topics[topicNo];
+
+            //Search Bing images using this topic
+
+            string bingImagesUrl = $"https://bing.com/images/search?q={topic}&qft=+filterui:imagesize-wallpaper&FORM=IRFLTR";
+
+            HttpClient wc = new HttpClient();
+            wc.DefaultRequestHeaders.Add("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36");
+            wc.DefaultRequestHeaders.Add("Accept", "*/*");
+            var data = wc.GetStringAsync(bingImagesUrl).Result;
+
+            //Scrape out the image urls using regex
+
+            Regex regex = new Regex("(?<=murl\\&quot;:\\&quot;)(.|\n)*?(?=\\&quot;,\\&quot;turl)");
+            var matches = regex.Matches(data);
+
+
+            //Pick a random url
+
+            var urls = matches.Select(x => x.Value).Where(p => p.EndsWith("jpg") || p.EndsWith("png") || p.EndsWith("jpeg")).ToList();
+
+            var sUrl = urls[randomGen.Next(0, urls.Count - 1)];
+
+            //Download file and return path
+            return Utils.DownloadUrlToDisk(sUrl);
+        }
+
+        public string Name()
+        {
+            return "RandomFromWeb";
+        }
+    }
+}

src/wallpaper.csproj

@@ -18,8 +18,8 @@
     <DefineConstants>Linux</DefineConstants>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Newtonsoft.Json" Version="12.0.3"/>
-    <PackageReference Include="System.Drawing.Common" Version="4.7.0"/>
-    <PackageReference Include="Microsoft.Win32.Registry" Version="4.7.0"/>
+    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
+    <PackageReference Include="System.Drawing.Common" Version="4.7.0" />
+    <PackageReference Include="Microsoft.Win32.Registry" Version="4.7.0" />
   </ItemGroup>
 </Project>