FEATURE-838: Added support for dragging an image from google image search results directly into the editor.

GreenshotPlugin/Core/NetworkHelper.cs

@@ -86,6 +86,26 @@ namespace GreenshotPlugin.Core {
 			return null;
 		}
 
+		/// <summary>
+		/// Download the uri into a memorystream, without catching exceptions
+		/// </summary>
+		/// <param name="url">Of an image</param>
+		/// <returns>MemoryStream which is already seeked to 0</returns>
+		public static MemoryStream GetAsMemoryStream(string url) {
+			HttpWebRequest request = CreateWebRequest(url);
+			using (HttpWebResponse response = (HttpWebResponse)request.GetResponse()) {
+				MemoryStream memoryStream = new MemoryStream();
+				using (Stream responseStream = response.GetResponseStream()) {
+					if (responseStream != null) {
+						responseStream.CopyTo(memoryStream);
+					}
+					// Make sure it can be used directly
+					memoryStream.Seek(0, SeekOrigin.Begin);
+				}
+				return memoryStream;
+			}
+		}
+
 		/// <summary>
 		/// Download the uri to Bitmap
 		/// </summary>
@@ -93,16 +113,28 @@ namespace GreenshotPlugin.Core {
 		/// <returns>Bitmap</returns>
 		public static Image DownloadImage(string url) {
 			try {
-				HttpWebRequest request = CreateWebRequest(url);
-				HttpWebResponse response = (HttpWebResponse)request.GetResponse();
-				if (request.HaveResponse) {
-					using (Stream responseStream = response.GetResponseStream()) {
-						if (responseStream != null) {
-							using (Image image = Image.FromStream(responseStream)) {
+				string content;
+				using (MemoryStream memoryStream = GetAsMemoryStream(url)) {
+					try {
+						using (Image image = Image.FromStream(memoryStream)) {
+							return ImageHelper.Clone(image, PixelFormat.Format32bppArgb);
+						}
+					} catch (Exception) {
+						// If we arrive here, the image loading didn't work, try to see if the response has a http(s) URL to an image and just take this instead.
+						using (StreamReader streamReader = new StreamReader(memoryStream, Encoding.UTF8, true)) {
+							content = streamReader.ReadLine();
+						}
+						Regex imageUrlRegex = new Regex(@"(http|https)://.*(\.png|\.gif|\.jpg|\.tiff|\.jpeg|\.bmp)");
+						Match match = imageUrlRegex.Match(content);
+						if (match.Success) {
+							using (MemoryStream memoryStream2 = GetAsMemoryStream(match.Value)) {
+								using (Image image = Image.FromStream(memoryStream2)) {
 									return ImageHelper.Clone(image, PixelFormat.Format32bppArgb);
 								}
 							}
 						}
+						throw;
+					}
 				}
 			} catch (Exception e) {
 				LOG.Error("Problem downloading the image from: " + url, e);

GreenshotPlugin/Core/StringExtensions.cs

@@ -148,5 +148,19 @@ namespace GreenshotPlugin.Core {
 
 			return returnValue;
 		}
+
+		/// <summary>
+		/// Read "streamextensions" :)
+		/// </summary>
+		/// <param name="input">Stream</param>
+		/// <param name="output">Stream</param>
+		public static void CopyTo(this Stream input, Stream output) {
+			byte[] buffer = new byte[16 * 1024]; // Fairly arbitrary size
+			int bytesRead;
+
+			while ((bytesRead = input.Read(buffer, 0, buffer.Length)) > 0) {
+				output.Write(buffer, 0, bytesRead);
+			}
+		}
 	}
 }