// Credit: http://stackoverflow.com/questions/1460273/how-to-check-if-a-file-exists-on-an-webserver-by-its-url
// Credit: http://stackoverflow.com/questions/3614034/system-net-webexception-http-status-code
public bool FileExistsAtUrl(string url, out long fileSize)
{
if (string.IsNullOrEmpty(url))
{
fileSize = 0L;
return(false);
}
if (IsGoogleDriveURL(url))
{
url = PatchUtils.GetGoogleDriveDownloadLinkFromUrl(url);
}
WebRequest request = WebRequest.Create(url);
request.Method = "HEAD";
request.Timeout = PatchParameters.FileAvailabilityCheckTimeout;
try
{
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
{
fileSize = response.ContentLength;
return(response.StatusCode == HttpStatusCode.OK);
}
}
catch (WebException e)
{
fileSize = 0L;
if (e.Response != null && e.Response is HttpWebResponse)
{
using (HttpWebResponse exResponse = (HttpWebResponse)e.Response)
{
if (exResponse.StatusCode == HttpStatusCode.ServiceUnavailable)
{
// Drive returns 503 error while requesting HEAD for valid download links
if (IsGoogleDriveURL(url))
{
return(true);
}
}
}
}
comms.LogToFile(e);
return(false);
}
}
// For self-patching applications only - should be called after Run(true) returns PatchResult.Success
// Starts specified self patcher executable with required parameters
public bool ApplySelfPatch(string selfPatcherExecutable, string postSelfPatchExecutable = null)
{
IsRunning = true;
Operation = PatchOperation.ApplyingSelfPatch;
comms.InitializeFileLogger();
comms.ListenerCallStarted();
try
{
selfPatcherExecutable = selfPatcherExecutable.Trim();
if (postSelfPatchExecutable != null)
{
postSelfPatchExecutable = postSelfPatchExecutable.Trim();
}
if (!File.Exists(selfPatcherExecutable))
{
Result = PatchResult.Failed;
FailReason = PatchFailReason.SelfPatcherNotFound;
FailDetails = Localization.Get(StringId.E_SelfPatcherDoesNotExist);
comms.Log(comms.FailDetails);
return(false);
}
string instructionsPath = comms.CachePath + PatchParameters.SELF_PATCH_INSTRUCTIONS_FILENAME;
string completedInstructionsPath = comms.CachePath + PatchParameters.SELF_PATCH_COMPLETED_INSTRUCTIONS_FILENAME;
if (!File.Exists(instructionsPath))
{
Result = PatchResult.Failed;
FailReason = PatchFailReason.Unknown;
FailDetails = "";
comms.LogToFile(Localization.Get(StringId.E_XDoesNotExist, instructionsPath));
return(false);
}
FileInfo selfPatcher = new FileInfo(selfPatcherExecutable);
string args = "\"" + instructionsPath + "\" \"" + completedInstructionsPath + "\"";
if (!string.IsNullOrEmpty(postSelfPatchExecutable) && File.Exists(postSelfPatchExecutable))
{
args += " \"" + postSelfPatchExecutable + "\"";
}
ProcessStartInfo startInfo = new ProcessStartInfo(selfPatcher.FullName)
{
Arguments = args,
WorkingDirectory = selfPatcher.DirectoryName
};
Process.Start(startInfo);
Result = PatchResult.Success;
}
catch (Exception e)
{
Result = PatchResult.Failed;
FailReason = PatchFailReason.FatalException;
FailDetails = e.ToString();
comms.LogToFile(e);
return(false);
}
finally
{
comms.DisposeFileLogger();
IsRunning = false;
comms.ListenerCallFinished();
}
Process.GetCurrentProcess().Kill();
return(true);
}
