Add file access check for file upload (#116)

* Add a check to validate that we can read the file by reading the first 10MB when uploading a new file or resuming an upload

src/sync.d

@@ -1124,6 +1124,10 @@ final class SyncEngine
 		//auto maxUploadFileSize = 21474836480; // 20GB
 		auto thisFileSize = getSize(path);
 		
+		// Can we read the file - as a permissions issue or file corruption will cause a failure
+		// https://github.com/abraunegg/onedrive/issues/113
+		if (readLocalFile(path)){
+			// able to read the file
 			if (thisFileSize <= maxUploadFileSize){
 				// Resolves: https://github.com/skilion/onedrive/issues/121, https://github.com/skilion/onedrive/issues/294, https://github.com/skilion/onedrive/issues/329
 			
@@ -1264,6 +1268,7 @@ final class SyncEngine
 				log.log("Skipping uploading this new file as it exceeds the maximum size allowed by OneDrive: ", path);
 			}
 		}
+	}
 
 	private void uploadDeleteItem(Item item, string path)
 	{

src/upload.d

@@ -1,7 +1,6 @@
 import std.algorithm, std.conv, std.datetime, std.file, std.json;
 import std.stdio, core.thread;
-import progress;
-import onedrive;
+import progress, onedrive, util;
 static import log;
 
 private long fragmentSize = 10 * 2^^20; // 10 MiB
@@ -63,6 +62,10 @@ struct UploadSession
 				log.vlog("The file does not exist anymore");
 				return false;
 			}
+			// Can we read the file - as a permissions issue or file corruption will cause a failure on resume
+			// https://github.com/abraunegg/onedrive/issues/113
+			if (readLocalFile(session["localPath"].str)){
+				// able to read the file
 				// request the session status
 				JSONValue response;
 				try {
@@ -82,6 +85,11 @@ struct UploadSession
 					return false;
 				}
 				return true;
+			} else {
+				// unable to read the local file
+				remove(sessionFilePath);
+				return false;
+			}
 		}
 		return false;
 	}

src/util.d

@@ -12,6 +12,7 @@ import std.string;
 import std.algorithm;
 import std.uri;
 import qxor;
+static import log;
 
 private string deviceName;
 
@@ -129,6 +130,22 @@ bool testNetwork()
 	}
 }
 
+// Can we read the file - as a permissions issue or file corruption will cause a failure
+// https://github.com/abraunegg/onedrive/issues/113
+// returns true if file can be accessed
+bool readLocalFile(string path)
+{
+	try {
+		// attempt to read the first 10MB of the file
+		read(path,10000000);
+	} catch (std.file.FileException e) {
+		// unable to read the new local file
+		log.log("Skipping uploading this file as it cannot be read (file permissions or file corruption): ", path);
+		return false;
+	}
+	return true;
+}
+
 // calls globMatch for each string in pattern separated by '|'
 bool multiGlobMatch(const(char)[] path, const(char)[] pattern)
 {