static void LoadGeminiLink(Uri uri)
{
string result;
bool retrieved = false;
GeminiResponse resp;
resp = new GeminiResponse();
try
{
resp = (GeminiResponse)Gemini.Fetch(uri);
retrieved = true;
}
catch (Exception e)
{
//the native gui.cs Messagebox does not resize to show enough content
//so we use our own that is better
Dialogs.MsgBoxOK("Gemini error", uri.AbsoluteUri + "\n\n" + e.Message);
}
if (retrieved)
{
if (resp.codeMajor == '2')
{
//examine the first component of the media type up to any semi colon
switch (resp.mime.Split(';')[0].Trim())
{
case "text/gemini":
case "text/plain":
case "text/html":
{
string body = Encoding.UTF8.GetString(resp.bytes.ToArray());
result = (body);
if (!resp.mime.StartsWith("text/gemini"))
{
//display as preformatted text
result = "```\n" + result + "\n```\n";
}
break;
}
default: // report the mime type only for now
result = ("Some " + resp.mime + " content was received, but cannot currently be displayed.");
break;
}
//render the content and add to history
SetAsCurrent(resp.uri); //remember the final URI, since it may have been redirected.
if (_history.Count > 0)
{
_history.Peek().top = _lineView.TopItem;
_history.Peek().selected = _lineView.SelectedItem; //remember the line offset of the current page
}
_history.Push(new CachedPage(resp.uri, result, 0, 0));
RenderGemini(resp.uri.AbsoluteUri, result, _lineView);
}
else if (resp.codeMajor == '1')
{
//input requested from server
var userResponse = Dialogs.SingleLineInputBox("Input request from: " + uri.Authority, resp.meta, "");
if ((userResponse.ButtonPressed == TextDialogResponse.Buttons.Ok) && (userResponse.Text != ""))
{
var ub = new UriBuilder(uri);
ub.Query = userResponse.Text;
LoadGeminiLink(ub.Uri);
}
}
else if ((resp.codeMajor == '5') && (resp.codeMinor == '1'))
{
//not found
Dialogs.MsgBoxOK("Not found", "The resource was not found on the server: \n\n" + resp.uri.AbsoluteUri);
}
else
{
Dialogs.MsgBoxOK("Gemini server response", uri.AbsoluteUri + "\n\n" + "Status: " + resp.codeMajor + resp.codeMinor + ": " + resp.meta);
}
}
}
public void NavigateGeminiScheme(string fullQuery, System.Windows.Navigation.NavigatingCancelEventArgs e, SiteIdentity siteIdentity, bool requireSecure = true)
{
var geminiUri = e.Uri.OriginalString;
var sessionPath = Session.Instance.SessionPath;
var appDir = AppDomain.CurrentDomain.BaseDirectory;
var settings = new UserSettings();
var hash = HashService.GetMd5Hash(fullQuery);
//uses .txt as extension so content loaded as text/plain not interpreted by the browser
//if user requests a view-source.
var rawFile = sessionPath + "\\" + hash + ".txt";
var gmiFile = sessionPath + "\\" + hash + ".gmi";
var htmlFile = sessionPath + "\\" + hash + ".htm";
//delete txt file as GemGet seems to sometimes overwrite not create afresh
File.Delete(rawFile);
File.Delete(gmiFile);
//delete any existing html file to encourage webbrowser to reload it
File.Delete(htmlFile);
var uri = new Uri(fullQuery);
//use a proxy for any other scheme that is not gemini
var proxy = ""; //use none
var connectInsecure = false;
X509Certificate2 certificate;
certificate = Session.Instance.CertificatesManager.GetCertificate(uri.Host); //may be null if none assigned or available
if (uri.Scheme != "gemini")
{
proxy = settings.HttpSchemeProxy;
}
try
{
GeminiResponse geminiResponse;
try
{
geminiResponse = (GeminiResponse)Gemini.Fetch(uri, certificate, proxy, connectInsecure, settings.MaxDownloadSizeMb * 1024, settings.MaxDownloadTimeSeconds);
}
catch (Exception err)
{
//warn, but continue if there are server validation errors
//in these early days of Gemini we dont forbid visiting a site with an expired cert or mismatched host name
//but we do give a warning each time
if (err.Message == "The remote certificate was rejected by the provided RemoteCertificateValidationCallback.")
{
mMainWindow.ToastNotify("Note: the certificate from: " + e.Uri.Authority + " is expired or invalid.", ToastMessageStyles.Warning);
//try again insecure this time
geminiResponse = (GeminiResponse)Gemini.Fetch(uri, certificate, proxy, true, settings.MaxDownloadSizeMb * 1024, settings.MaxDownloadTimeSeconds);
}
else
{
//reraise
throw;
}
}
if (geminiResponse.codeMajor == '1')
{
//needs input, then refetch
mMainWindow.ToggleContainerControlsForBrowser(true);
NavigateGeminiWithInput(e, geminiResponse);
}
else if (geminiResponse.codeMajor == '2')
{
//success
File.WriteAllBytes(rawFile, geminiResponse.bytes.ToArray());
if (File.Exists(rawFile))
{
if (geminiResponse.meta.Contains("text/gemini"))
{
File.Copy(rawFile, gmiFile);
}
else if (geminiResponse.meta.Contains("text/html"))
{
//is an html file served over gemini - probably not common, but not unheard of
var htmltoGmiResult = ConverterService.HtmlToGmi(rawFile, gmiFile);
if (htmltoGmiResult.Item1 != 0)
{
mMainWindow.ToastNotify("Could not convert HTML to GMI: " + fullQuery, ToastMessageStyles.Error);
mMainWindow.ToggleContainerControlsForBrowser(true);
e.Cancel = true;
return;
}
}
else if (geminiResponse.meta.Contains("text/"))
{
//convert plain text to a gemini version (wraps it in a preformatted section)
var textToGmiResult = ConverterService.TextToGmi(rawFile, gmiFile);
if (textToGmiResult.Item1 != 0)
{
mMainWindow.ToastNotify("Could not render text as GMI: " + fullQuery, ToastMessageStyles.Error);
mMainWindow.ToggleContainerControlsForBrowser(true);
e.Cancel = true;
return;
}
}
else
{
//a download
//its an image - rename the raw file and just show it
var pathFragment = (new UriBuilder(fullQuery)).Path;
var ext = Path.GetExtension(pathFragment);
var binFile = rawFile + (ext == "" ? ".tmp" : ext);
File.Copy(rawFile, binFile, true); //rename overwriting
if (geminiResponse.meta.Contains("image/"))
{
mMainWindow.ShowImage(fullQuery, binFile, e);
}
else
{
SaveFileDialog saveFileDialog = new SaveFileDialog();
saveFileDialog.FileName = Path.GetFileName(pathFragment);
if (saveFileDialog.ShowDialog() == true)
{
try
{
//save the file
var savePath = saveFileDialog.FileName;
File.Copy(binFile, savePath, true); //rename overwriting
mMainWindow.ToastNotify("File saved to " + savePath, ToastMessageStyles.Success);
}
catch (SystemException err)
{
mMainWindow.ToastNotify("Could not save the file due to: " + err.Message, ToastMessageStyles.Error);
}
}
mMainWindow.ToggleContainerControlsForBrowser(true);
e.Cancel = true;
}
return;
}
if (geminiResponse.uri.ToString() != fullQuery)
{
string redirectUri = fullQuery;
if (geminiResponse.uri.ToString().Contains("://"))
{
//a full url
//normalise the URi (e.g. remove default port if specified)
redirectUri = UriTester.NormaliseUri(new Uri(geminiResponse.uri.ToString())).ToString();
}
else
{
//a relative one
var baseUri = new Uri(fullQuery);
var targetUri = new Uri(baseUri, geminiResponse.uri.ToString());
redirectUri = UriTester.NormaliseUri(targetUri).ToString();
}
var finalUri = new Uri(redirectUri);
if (e.Uri.Scheme == "gemini" && finalUri.Scheme != "gemini")
{
//cross-scheme redirect, not supported
mMainWindow.ToastNotify("Cross scheme redirect from Gemini not supported: " + redirectUri, ToastMessageStyles.Warning);
mMainWindow.ToggleContainerControlsForBrowser(true);
e.Cancel = true;
return;
}
else
{
//others e.g. http->https redirect are fine
}
//redirected to a full gemini url
geminiUri = redirectUri;
//regenerate the hashes using the redirected target url
hash = HashService.GetMd5Hash(geminiUri);
var gmiFileNew = sessionPath + "\\" + hash + ".txt";
var htmlFileNew = sessionPath + "\\" + hash + ".htm";
//move the source file
try
{
if (File.Exists(gmiFileNew))
{
File.Delete(gmiFileNew);
}
File.Move(gmiFile, gmiFileNew);
}
catch (Exception err)
{
mMainWindow.ToastNotify(err.ToString(), ToastMessageStyles.Error);
}
//update locations of gmi and html file
gmiFile = gmiFileNew;
htmlFile = htmlFileNew;
}
else
{
geminiUri = fullQuery;
}
var userThemesFolder = ResourceFinder.LocalOrDevFolder(appDir, @"GmiConverters\themes", @"..\..\..\GmiConverters\themes");
var userThemeBase = Path.Combine(userThemesFolder, settings.Theme);
mMainWindow.ShowUrl(geminiUri, gmiFile, htmlFile, userThemeBase, siteIdentity, e);
}
}
// codemajor = 3 is redirect - should eventually end in success or raise an error
else if (geminiResponse.codeMajor == '4')
{
mMainWindow.ToastNotify("Temporary failure (status 4X)\n\n" + e.Uri.ToString(), ToastMessageStyles.Warning);
}
else if (geminiResponse.codeMajor == '5')
{
if (geminiResponse.codeMinor == '1')
{
mMainWindow.ToastNotify("Page not found\n\n" + e.Uri.ToString(), ToastMessageStyles.Warning);
}
else
{
mMainWindow.ToastNotify("Permanent failure (status 5X)\n\n" + geminiResponse.meta + "\n\n" + e.Uri.ToString(), ToastMessageStyles.Warning);
}
}
else if (geminiResponse.codeMajor == '6')
{
mMainWindow.ToastNotify("Certificate requried. Choose one and try again.\n\n" + e.Uri.ToString(), ToastMessageStyles.Warning);
}
else
{
mMainWindow.ToastNotify("Unexpected output from server " +
"(status " + geminiResponse.codeMajor + "." + geminiResponse.codeMinor + ") " +
geminiResponse.meta + "\n\n"
+ e.Uri.ToString(), ToastMessageStyles.Warning);
}
}
catch (Exception err)
{
//generic handler for other runtime errors
mMainWindow.ToastNotify("Error getting gemini content for " + e.Uri.ToString() + "\n\n" + err.Message, ToastMessageStyles.Warning);
}
//make the window responsive again
mMainWindow.ToggleContainerControlsForBrowser(true);
//no further navigation right now
e.Cancel = true;
}
static void LoadLink(Uri uri)
{
string result;
//special treatment for about: scheme
if (uri.Scheme == "about")
{
result = ReadAboutSchemeFile(uri);
RenderGemini(uri.AbsoluteUri, result, _lineView);
_history.Push(new CachedPage(uri, result, 0, 0));
SetAsCurrent(uri);
return;
}
bool retrieved = false;
GeminiResponse resp;
resp = new GeminiResponse();
try
{
resp = (GeminiResponse)Gemini.Fetch(uri);
retrieved = true;
}
catch (Exception e)
{
//seems to be a bug that the native Messagebox does not resize to show enough content
MsgBoxOK("Retrieval error", e.Message);
}
if (retrieved)
{
if (resp.codeMajor == '2')
{
//examine the first component of the media type up to any semi colon
switch (resp.mime.Split(';')[0].Trim())
{
case "text/gemini":
case "text/plain":
case "text/html":
{
string body = Encoding.UTF8.GetString(resp.bytes.ToArray());
result = (body);
if (!resp.mime.StartsWith("text/gemini"))
{
//display as preformatted text
result = "```\n" + result + "\n```\n";
}
break;
}
default: // report the mime type only for now
result = ("Some " + resp.mime + " content was received, but cannot currently be displayed.");
break;
}
//render the content and add to history
SetAsCurrent(resp.uri); //remember the final URI, since it may have been redirected.
if (_history.Count > 0)
{
_history.Peek().top = _lineView.TopItem;
_history.Peek().selected = _lineView.SelectedItem; //remember the line offset of the current page
}
_history.Push(new CachedPage(resp.uri, result, 0, 0));
RenderGemini(resp.uri.AbsoluteUri, result, _lineView);
}
else if (resp.codeMajor == '1')
{
//input requested from server
var userText = InputBox("Input request from: " + uri.Authority, resp.meta, "");
if (userText != "")
{
var ub = new UriBuilder(uri);
ub.Query = userText;
LoadLink(ub.Uri);
}
}
else
{
MsgBoxOK("Gemini error", "Status: " + resp.codeMajor + resp.codeMinor + ": " + resp.meta);
}
}
}
