public static IHtmlString PreFormattedText(this HtmlHelper self, string text)
{
// Encode HTML entities. Important! Security!
var encodedText = HttpUtility.HtmlEncode(text);
// Turn HTTP and HTTPS URLs into links.
// Source: https://stackoverflow.com/a/4750468
encodedText = RegexEx.TryReplaceWithTimeout(
encodedText,
@"((http|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@?^=%&:/~\+#]*[\w\-\@?^=%&/~\+#])?)",
match => $"<a href=\"{match.Value}\" rel=\"nofollow\">{match.Value}</a>",
RegexOptions.IgnoreCase);
// Replace new lines with the <br /> tag.
encodedText = encodedText.Replace("\n", "<br />");
// Replace more than one space in a row with a space then .
encodedText = RegexEx.TryReplaceWithTimeout(
encodedText,
" +",
match => " " + string.Join(string.Empty, Enumerable.Repeat(" ", match.Value.Length - 1)),
RegexOptions.None);
return(self.Raw(encodedText));
}
public static IHtmlString PreFormattedText(this HtmlHelper self, string text, IGalleryConfigurationService configurationService)
{
// Encode HTML entities. Important! Security!
var encodedText = HttpUtility.HtmlEncode(text);
// Turn HTTP and HTTPS URLs into links.
// Source: https://stackoverflow.com/a/4750468
string anchorEvaluator(Match match)
{
string trimmedEntityValue = string.Empty;
string trimmedAnchorValue = match.Value;
foreach (var trimmedEntity in _trimmedHtmlEntities)
{
if (match.Value.EndsWith(trimmedEntity))
{
// Remove trailing html entity from anchor URL
trimmedAnchorValue = match.Value.Substring(0, match.Value.Length - trimmedEntity.Length);
trimmedEntityValue = trimmedEntity;
break;
}
}
if (PackageHelper.TryPrepareUrlForRendering(trimmedAnchorValue, out string formattedUri))
{
string anchorText = formattedUri;
string siteRoot = configurationService.GetSiteRoot(useHttps: true);
// Format links to NuGet packages
Match packageMatch = RegexEx.MatchWithTimeout(formattedUri, $@"({Regex.Escape(siteRoot)}\/packages\/(?<name>\w+([_.-]\w+)*(\/[0-9a-zA-Z-.]+)?)\/?$)", RegexOptions.IgnoreCase);
if (packageMatch != null && packageMatch.Groups["name"].Success)
{
anchorText = packageMatch.Groups["name"].Value;
}
return($"<a href=\"{formattedUri}\" rel=\"nofollow\">{anchorText}</a>" + trimmedEntityValue);
}
return(match.Value);
}
encodedText = RegexEx.TryReplaceWithTimeout(
encodedText,
@"((http|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@?^=%&:/~\+#]*[\w\-\@?^=%&/~\+#])?)",
anchorEvaluator,
RegexOptions.IgnoreCase);
// Replace new lines with the <br /> tag.
encodedText = encodedText.Replace("\n", "<br />");
// Replace more than one space in a row with a space then .
encodedText = RegexEx.TryReplaceWithTimeout(
encodedText,
" +",
match => " " + string.Join(string.Empty, Enumerable.Repeat(" ", match.Value.Length - 1)),
RegexOptions.None);
return(self.Raw(encodedText));
}
public static IHtmlString PreFormattedText(this HtmlHelper self, string text)
{
// Encode HTML entities. Important! Security!
var encodedText = HttpUtility.HtmlEncode(text);
// Turn HTTP and HTTPS URLs into links.
// Source: https://stackoverflow.com/a/4750468
string anchorEvaluator(Match match)
{
string trimmedEntityValue = string.Empty;
string trimmedAnchorValue = match.Value;
foreach (var trimmedEntity in _trimmedHtmlEntities)
{
if (match.Value.EndsWith(trimmedEntity))
{
// Remove trailing html entity from anchor URL
trimmedAnchorValue = match.Value.Substring(0, match.Value.Length - trimmedEntity.Length);
trimmedEntityValue = trimmedEntity;
break;
}
}
if (PackageHelper.TryPrepareUrlForRendering(trimmedAnchorValue, out string formattedUri))
{
return($"<a href=\"{formattedUri}\" rel=\"nofollow\">{formattedUri}</a>" + trimmedEntityValue);
}
return(match.Value);
}
encodedText = RegexEx.TryReplaceWithTimeout(
encodedText,
@"((http|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@?^=%&:/~\+#]*[\w\-\@?^=%&/~\+#])?)",
anchorEvaluator,
RegexOptions.IgnoreCase);
// Replace new lines with the <br /> tag.
encodedText = encodedText.Replace("\n", "<br />");
// Replace more than one space in a row with a space then .
encodedText = RegexEx.TryReplaceWithTimeout(
encodedText,
" +",
match => " " + string.Join(string.Empty, Enumerable.Repeat(" ", match.Value.Length - 1)),
RegexOptions.None);
return(self.Raw(encodedText));
}
public static IHtmlString PreFormattedText(this HtmlHelper self, string text, IGalleryConfigurationService configurationService)
{
void appendText(StringBuilder builder, string inputText)
{
var encodedText = HttpUtility.HtmlEncode(inputText);
// Replace new lines with the <br /> tag.
encodedText = encodedText.Replace("\n", "<br />");
// Replace more than one space in a row with a space then .
encodedText = RegexEx.TryReplaceWithTimeout(
encodedText,
" +",
match => " " + string.Join(string.Empty, Enumerable.Repeat(" ", match.Value.Length - 1)),
RegexOptions.None);
builder.Append(encodedText);
}
void appendUrl(StringBuilder builder, string inputText)
{
string trimmedEntityValue = string.Empty;
string trimmedAnchorValue = inputText;
foreach (var trimmedEntity in _trimmedHtmlEntities)
{
if (inputText.EndsWith(trimmedEntity))
{
// Remove trailing html entity from anchor URL
trimmedAnchorValue = inputText.Substring(0, inputText.Length - trimmedEntity.Length);
trimmedEntityValue = trimmedEntity;
break;
}
}
if (PackageHelper.TryPrepareUrlForRendering(trimmedAnchorValue, out string formattedUri))
{
string anchorText = formattedUri;
string siteRoot = configurationService.GetSiteRoot(useHttps: true);
// Format links to NuGet packages
Match packageMatch = RegexEx.MatchWithTimeout(
formattedUri,
$@"({Regex.Escape(siteRoot)}\/packages\/(?<name>\w+([_.-]\w+)*(\/[0-9a-zA-Z-.]+)?)\/?$)",
RegexOptions.IgnoreCase);
if (packageMatch != null && packageMatch.Groups["name"].Success)
{
anchorText = packageMatch.Groups["name"].Value;
}
builder.AppendFormat(
"<a href=\"{0}\" rel=\"nofollow\">{1}</a>{2}",
HttpUtility.HtmlEncode(formattedUri),
HttpUtility.HtmlEncode(anchorText),
HttpUtility.HtmlEncode(trimmedEntityValue));
}
else
{
builder.Append(HttpUtility.HtmlEncode(inputText));
}
}
// Turn HTTP and HTTPS URLs into links.
// Source: https://stackoverflow.com/a/4750468
var matches = RegexEx.MatchesWithTimeout(
text,
@"((http|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@?^=%&:/~\+#]*[\w\-\@?^=%&/~\+#])?)",
RegexOptions.IgnoreCase);
var output = new StringBuilder(text.Length);
var currentIndex = 0;
if (matches != null && matches.Count > 0)
{
foreach (Match match in matches)
{
// Encode the text literal before the URL, if any.
var literalLength = match.Index - currentIndex;
if (literalLength > 0)
{
var literal = text.Substring(currentIndex, literalLength);
appendText(output, literal);
}
// Encode the URL.
var url = match.Value;
appendUrl(output, url);
currentIndex = match.Index + match.Length;
}
}
// Encode the text literal appearing after the last URL, if any.
if (currentIndex < text.Length)
{
var literal = text.Substring(currentIndex, text.Length - currentIndex);
appendText(output, literal);
}
return(self.Raw(output.ToString()));
}
