protected VerificationCodeImage(Size size, VerificationCodeTextProvider textProvider, CaptchaCharacterSet characterSet, int?maximumCharacters, int?minimumCharacters)
{
if (textProvider == null)
{
throw new ArgumentNullException("textProvider");
}
if (size.Width < MinimumSize.Width || size.Height < MinimumSize.Height)
{
throw new ArgumentOutOfRangeException("size", size, "Errors.SizePositiveIntRequired");
}
this.textProvider = textProvider;
if (maximumCharacters.HasValue)
{
this.textProvider.MaximumCharacters = maximumCharacters.Value;
}
if (minimumCharacters.HasValue)
{
this.textProvider.MinimumCharacters = minimumCharacters.Value;
}
this.size = size;
this.fonts = new List <Font>(textProvider.Fonts);
this.textColors = new List <Color>(textProvider.Colors);
this.characterSet = characterSet;
}
// NOTE: MinimumSize size is only specified when background is null so that ArgumentNullException may be thrown by this constructor
// after the base constructor is finished.
protected BackgroundVerificationCodeImage(Image background, VerificationCodeTextProvider textProvider, CaptchaCharacterSet characterSet, int? maximumCharacters, int? minimumCharacters)
: base((background == null) ? MinimumSize : background.Size, textProvider, characterSet, maximumCharacters, minimumCharacters)
{
if (background == null)
throw new ArgumentNullException("background");
this.background = background;
}
public PartitionedVerificationCodeImage(Image background, VerificationCodeTextProvider textProvider, CaptchaCharacterSet characterSet, int? maximumCharacters, int? minimumCharacters)
: base(background, textProvider, characterSet, maximumCharacters, minimumCharacters)
{
if (textProvider == null)
throw new ArgumentNullException("textProvider");
minFontSize = textProvider.MinimumFontSize;
maxFontSize = textProvider.MaximumFontSize;
}
public void ProcessRequest(HttpContext context)
{
HttpContextBase currentContext = new HttpContextWrapper(context);
bool isremove = false;
if (!string.IsNullOrEmpty(context.Request.QueryString["isremove"]))
{
bool.TryParse(context.Request.QueryString["isremove"], out isremove);
}
string cookieName = CaptchaSettings.Instance().CaptchaCookieName;
bool enableLineNoise = CaptchaSettings.Instance().EnableLineNoise;
CaptchaCharacterSet characterSet = CaptchaSettings.Instance().CharacterSet;
int minCharacterCount = CaptchaSettings.Instance().MinCharacterCount;
int maxCharacterCount = CaptchaSettings.Instance().MaxCharacterCount;
string generatedKey = string.Empty;
bool addCooikes = false;
//创建或从缓存取验证码
string key = null;
if (context.Request.Cookies[cookieName] != null)
{
key = context.Request.Cookies[cookieName].Value;
}
if (isremove && !string.IsNullOrEmpty(key))
{
VerificationCodeManager.GetCachedTextAndForceExpire(currentContext, getCurrentLevelKey(key));
}
System.IO.MemoryStream ms = null;
if (!string.IsNullOrEmpty(key))
{
ms = VerificationCodeManager.GetCachedImageStream(getCurrentLevelKey(key));
}
if (ms == null)
{
Size size = new Size(85, 30);
VerificationCodeImage image = VerificationCodeManager.GenerateAndCacheImage(currentContext, size, 300, out generatedKey, characterSet, enableLineNoise, minCharacterCount, maxCharacterCount);
ms = VerificationCodeManager.GetCachedImageStream(getCurrentLevelKey(generatedKey));
VerificationCodeManager.CacheText(currentContext, image.Text, getCurrentLevelKey(generatedKey), false, 300);
addCooikes = true;
}
if (addCooikes)
{
HttpCookie cookie = new HttpCookie(cookieName, generatedKey);
context.Response.Cookies.Add(cookie);
}
context.Response.Cache.SetCacheability(HttpCacheability.NoCache);
context.Response.ContentType = "image/Jpeg";
context.Response.BinaryWrite(ms.ToArray());
//context.Response.Flush();
context.Response.End();
}
public LineNoiseVerificationCodeImage(Size size, VerificationCodeTextProvider textProvider, IEnumerable<Color> colors, CaptchaCharacterSet characterSet, int? maximumCharacters, int? minimumCharacters)
: base(size, textProvider, characterSet, maximumCharacters, minimumCharacters)
{
if (colors == null)
this.colors = new List<Color>(1);
else
this.colors = new List<Color>(colors);
if (this.colors.Count == 0)
this.colors.Add(Color.Black);
}
/// <summary>
/// 生成干扰图像
/// </summary>
/// <param name="name"></param>
/// <param name="size"></param>
/// <param name="textProvider"></param>
/// <param name="characterSet"></param>
/// <param name="maximumCharacters"></param>
/// <param name="minimumCharacters"></param>
/// <returns></returns>
public override VerificationCodeImage GenerateAutoInputProtectionImage(string name, Size size, VerificationCodeTextProvider textProvider, CaptchaCharacterSet characterSet, int? maximumCharacters, int? minimumCharacters)
{
LineNoiseVerificationCodeImage image = new LineNoiseVerificationCodeImage(size, textProvider, colors, characterSet, maximumCharacters, minimumCharacters);
// code added after 1.0.0 RTW:
if (Margin != -1)
image.Margin = Margin;
if (MinimumCharacterRotation != -1)
image.MinimumCharacterRotation = MinimumCharacterRotation;
if (MaximumCharacterRotation != -1)
image.MaximumCharacterRotation = MaximumCharacterRotation;
return image;
}
protected VerificationCodeImage(Size size, VerificationCodeTextProvider textProvider, CaptchaCharacterSet characterSet, int? maximumCharacters, int? minimumCharacters)
{
if (textProvider == null)
throw new ArgumentNullException("textProvider");
if (size.Width < MinimumSize.Width || size.Height < MinimumSize.Height)
throw new ArgumentOutOfRangeException("size", size, "Errors.SizePositiveIntRequired");
this.textProvider = textProvider;
if (maximumCharacters.HasValue)
this.textProvider.MaximumCharacters = maximumCharacters.Value;
if (minimumCharacters.HasValue)
this.textProvider.MinimumCharacters = minimumCharacters.Value;
this.size = size;
this.fonts = new List<Font>(textProvider.Fonts);
this.textColors = new List<Color>(textProvider.Colors);
this.characterSet = characterSet;
}
public IActionResult CaptchaHttp()
{
string cookieName = CaptchaSettings.Instance().CaptchaCookieName;
int minCharacterCount = CaptchaSettings.Instance().MinCharacterCount;
int maxCharacterCount = CaptchaSettings.Instance().MaxCharacterCount;
bool enableLineNoise = CaptchaSettings.Instance().EnableLineNoise;
CaptchaCharacterSet characterSet = CaptchaSettings.Instance().CharacterSet;
string generatedKey = string.Empty;
bool isAddCooikes = false;
//创建或从缓存取验证码
string publicKey = null;
if (HttpContext.Request.Cookies[cookieName] != null)
{
publicKey = HttpContext.Request.Cookies[cookieName];
}
MemoryStream ms = null;
if (!string.IsNullOrEmpty(publicKey))
{
ms = VerificationCodeManager.GetCachedImageStream(publicKey);
}
//如果缓存中的数据已经过期移除，就走生成图片流程
if (ms == null)
{
//生成验证码图片并返回验证码并且缓存起来
string code = VerificationCodeManager.GenerateAndCacheImage(out generatedKey);
ms = VerificationCodeManager.GetCachedImageStream(generatedKey);
VerificationCodeManager.CacheCode(HttpContext, code, generatedKey);
isAddCooikes = true;
}
if (isAddCooikes)
{
HttpContext.Response.Cookies.Append(cookieName, generatedKey);
}
byte[] bytes = ms.ToArray();
Response.Body.Dispose();
return(File(bytes, @"image/jpeg"));
}
/// <summary> /// When implemented by a derived type, creates an instance of a type that derives from <see cref="AutoInputProtectionImage"/> /// that generates an image of the specified <paramref name="size"/>, using the specified <paramref name="name"/> and /// <paramref name="textProvider"/>. /// </summary> /// <remarks> /// <para> /// Derived types are not required to use the <paramref name="name"/> argument. This overload is not used by the /// <see cref="AutoInputProtectionControl"/> control. /// </para> /// <para> /// A derived type can use the specified <paramref name="name"/> to load or generate a background <see cref="Image"/> /// that is passed to <see cref="GenerateImage(Image,AutoInputProtectionTextProvider)"/>, which creates an instance of /// <see cref="PartitionedAutoInputProtectionImage"/> that is then returned to the caller immediately or wrapped by a specialized class that /// is returned instead. Alternatively, a derived type may override <see cref="GenerateImage(Image,AutoInputProtectionTextProvider)"/> to /// create a custom implementation that is then returned by this method as is. /// </para> /// <para> /// See <see cref="ResourceAutoInputProtectionImageProvider"/> for information about one particular usage of the <paramref name="name"/> argument. /// </para> /// </remarks> /// <seealso cref="AutoInputProtection.GenerateAutoInputProtectionImage"/> /// <seealso cref="GenerateRandomAutoInputProtectionImage"/> /// <param name="name"><see cref="String"/> that identifies a particular named resource, style or image.</param> /// <param name="size">The dimensions of the image.</param> /// <param name="textProvider"><see cref="AutoInputProtectionTextProvider"/> implementation to be used by the <see cref="AutoInputProtectionImage"/> implementation that is created.</param> /// <returns>An <see cref="AutoInputProtectionImage"/> implementation that can generate an image of the specified <paramref name="size"/> using the specified /// <paramref name="textProvider"/>.</returns> public abstract override VerificationCodeImage GenerateAutoInputProtectionImage(string name, Size size, VerificationCodeTextProvider textProvider, CaptchaCharacterSet characterSet, int?maximumCharacters, int?minimumCharacters);
/// <summary>
/// Creates an instance of <see cref="PartitionedAutoInputProtectionImage"/> for the specified <paramref name="size"/>
/// and <paramref name="textProvider"/>.
/// </summary>
/// <remarks>
/// Derived types can override this method to return a type that either composites or derives from
/// <see cref="PartitionedAutoInputProtectionImage"/>.
/// </remarks>
/// <seealso cref="GenerateRandomAutoInputProtectionImage(Size,AutoInputProtectionTextProvider)"/>
/// <param name="size">The dimensions of the image.</param>
/// <param name="textProvider">The <see cref="AutoInputProtectionTextProvider"/> implementation that generates the text to be rendered.</param>
/// <returns>An instance of <see cref="PartitionedAutoInputProtectionImage"/> for the specified <paramref name="size"/>
/// and <paramref name="textProvider"/>.</returns>
protected virtual PartitionedVerificationCodeImage GenerateImage(Size size, VerificationCodeTextProvider textProvider, CaptchaCharacterSet characterSet, int?maximumCharacters, int?minimumCharacters)
{
PartitionedVerificationCodeImage image = new PartitionedVerificationCodeImage(size, textProvider, characterSet, maximumCharacters, minimumCharacters);
if (margin != -1)
{
image.Margin = margin;
}
if (minRotation != -1)
{
image.MinimumCharacterRotation = minRotation;
}
if (maxRotation != -1)
{
image.MaximumCharacterRotation = maxRotation;
}
return(image);
}
/// <summary>
/// 图像的生成和缓存
/// </summary>
/// <param name="context">httpcontext</param>
/// <param name="size">图像大小</param>
/// <param name="requestTimeoutSeconds">过期时间</param>
/// <param name="publicKey">生成的publicKey</param>
/// <param name="characterSet">字符集</param>
/// <param name="enableLineNoise">是否有干扰线</param>
/// <param name="maximumCharacters">最大字符长度</param>
/// <param name="minimumCharacters">最小字符长度</param>
/// <returns></returns>
public static VerificationCodeImage GenerateAndCacheImage(HttpContextBase context, Size size, int requestTimeoutSeconds, out string publicKey, CaptchaCharacterSet characterSet, bool enableLineNoise, int?minimumCharacters, int?maximumCharacters)
{
MemoryStream stream;
VerificationCodeImage aipImage;
int attempt = 0;
string text;
do
{
aipImage = GenerateRandomAutoInputProtectionImage(size, characterSet, maximumCharacters, minimumCharacters);
text = aipImage.Text;
}while (!CreateImageStream(ref attempt, context, aipImage, enableLineNoise, out stream));
lock (GenerateAndCacheImageLockObj)
{
publicKey = GeneratePublicCacheKey(context, text);
string imageKey = GetCacheKeyForImage(publicKey);
cacheService.Add(imageKey, stream.ToArray(), new TimeSpan(0, 5, 0));
}
return(aipImage);
}
protected BackgroundVerificationCodeImage(Image background, VerificationCodeTextProvider textProvider, CaptchaCharacterSet characterSet, int?maximumCharacters, int?minimumCharacters)
// NOTE: MinimumSize size is only specified when background is null so that ArgumentNullException may be thrown by this constructor
// after the base constructor is finished.
: base((background == null) ? MinimumSize : background.Size, textProvider, characterSet, maximumCharacters, minimumCharacters)
{
if (background == null)
{
throw new ArgumentNullException("background");
}
this.background = background;
}
private static VerificationCodeImage GenerateRandomAutoInputProtectionImage(Size size, CaptchaCharacterSet characterSet, int? maximumCharacters, int? minimumCharacters)
{
if (size.Width < 1 || size.Height < 1)
throw new ArgumentOutOfRangeException("size", size, "Errors.SizePositiveIntRequired");
EnsureProviders();
VerificationCodeImage image = null;
lock (VerificationCodeImageLockObj)
{
image = imageProvider.GenerateRandomAutoInputProtectionImage(size, textProvider, characterSet, maximumCharacters, minimumCharacters);
}
image.filters = filterProviders;
return image;
}
/// <summary>
/// Creates an instance of <see cref="PartitionedAutoInputProtectionImage"/> for the specified <paramref name="size"/>
/// and <paramref name="textProvider"/>.
/// </summary>
/// <remarks>
/// Derived types can override this method to return a type that either composites or derives from
/// <see cref="PartitionedAutoInputProtectionImage"/>.
/// </remarks>
/// <seealso cref="GenerateRandomAutoInputProtectionImage(Size,AutoInputProtectionTextProvider)"/>
/// <param name="size">The dimensions of the image.</param>
/// <param name="textProvider">The <see cref="AutoInputProtectionTextProvider"/> implementation that generates the text to be rendered.</param>
/// <returns>An instance of <see cref="PartitionedAutoInputProtectionImage"/> for the specified <paramref name="size"/>
/// and <paramref name="textProvider"/>.</returns>
protected virtual PartitionedVerificationCodeImage GenerateImage(Size size, VerificationCodeTextProvider textProvider, CaptchaCharacterSet characterSet, int? maximumCharacters, int? minimumCharacters)
{
PartitionedVerificationCodeImage image = new PartitionedVerificationCodeImage(size, textProvider, characterSet, maximumCharacters, minimumCharacters);
if (margin != -1)
image.Margin = margin;
if (minRotation != -1)
image.MinimumCharacterRotation = minRotation;
if (maxRotation != -1)
image.MaximumCharacterRotation = maxRotation;
return image;
}
/// <summary>
/// 生成图像
/// </summary>
/// <param name="size"></param>
/// <param name="textProvider"></param>
/// <param name="characterSet"></param>
/// <param name="maximumCharacters"></param>
/// <param name="minimumCharacters"></param>
/// <returns></returns>
public override VerificationCodeImage GenerateRandomAutoInputProtectionImage(Size size, VerificationCodeTextProvider textProvider, CaptchaCharacterSet characterSet, int? maximumCharacters, int? minimumCharacters)
{
return GenerateAutoInputProtectionImage(null, size, textProvider, characterSet, maximumCharacters, minimumCharacters);
}
public LineNoiseVerificationCodeImage(Size size, VerificationCodeTextProvider textProvider, CaptchaCharacterSet characterSet, int? maximumCharacters, int? minimumCharacters)
: base(size, textProvider, characterSet, maximumCharacters, minimumCharacters)
{
colors = new List<Color>(1);
colors.Add(Color.Black);
}
/// <summary>
/// 生成字符集
/// </summary>
/// <param name="characterSet"></param>
/// <returns></returns>
public override string GenerateRandomAutoInputProtectionText(CaptchaCharacterSet characterSet)
{
return VerificationCodeRandomString.Create(MinimumCharacters, MaximumCharacters, characterSet, null);
}
public PartitionedVerificationCodeImage(Image background, VerificationCodeTextProvider textProvider, CaptchaCharacterSet characterSet, int?maximumCharacters, int?minimumCharacters)
: base(background, textProvider, characterSet, maximumCharacters, minimumCharacters)
{
if (textProvider == null)
{
throw new ArgumentNullException("textProvider");
}
minFontSize = textProvider.MinimumFontSize;
maxFontSize = textProvider.MaximumFontSize;
}
public LineNoiseVerificationCodeImage(Size size, VerificationCodeTextProvider textProvider, IEnumerable <Color> colors, CaptchaCharacterSet characterSet, int?maximumCharacters, int?minimumCharacters)
: base(size, textProvider, characterSet, maximumCharacters, minimumCharacters)
{
if (colors == null)
{
this.colors = new List <Color>(1);
}
else
{
this.colors = new List <Color>(colors);
}
if (this.colors.Count == 0)
{
this.colors.Add(Color.Black);
}
}
public LineNoiseVerificationCodeImage(Size size, VerificationCodeTextProvider textProvider, CaptchaCharacterSet characterSet, int?maximumCharacters, int?minimumCharacters)
: base(size, textProvider, characterSet, maximumCharacters, minimumCharacters)
{
colors = new List <Color>(1);
colors.Add(Color.Black);
}
public abstract string GenerateRandomAutoInputProtectionText(CaptchaCharacterSet characterSet);
/// <summary>
/// Returns a string of random characters from the specified set of charactersAllowed, excluding
/// the characters in charactersNotAllowed, with a length that is between the
/// specified minLengthand maxLength values, inclusive.
/// </summary>
public static string Create(int minLength, int maxLength, CaptchaCharacterSet charactersAllowed, string charactersNotAllowed)
{
if (minLength < 0)
{
throw new ArgumentOutOfRangeException("minLength", minLength, "Errors.PositiveIntOrZeroRequired");
}
if (maxLength < minLength)
{
throw new ArgumentOutOfRangeException("maxLength", maxLength,
string.Format(System.Globalization.CultureInfo.CurrentUICulture, "Errors.RandomString_MaxLessThanMin", minLength));
}
List <int> validCharSetValues = new List <int>((int[])Enum.GetValues(typeof(CaptchaCharacterSet)));
for (int i = 0; i < validCharSetValues.Count;)
// for each index in the array of CharacterSet constant values remove
// the ones that aren't bit-aligned or aren't selected in charSets
{
int csVal = validCharSetValues[i];
if (!IsBitAligned(csVal) || (csVal & (int)charactersAllowed) == 0)
{
validCharSetValues.RemoveAt(i);
continue;
}
i++;
}
Random rnd = new Random();
int length = rnd.Next(minLength, maxLength + 1);
if (length == 0)
{
return(string.Empty);
}
StringBuilder value = new StringBuilder(length);
if (!string.IsNullOrEmpty(charactersNotAllowed))
{
for (int i = 0; i < length; i++)
// for each index in the string value generate a random character
{
CaptchaCharacterSet validCharacters = (CaptchaCharacterSet)validCharSetValues[rnd.Next(0, validCharSetValues.Count)];
Point range = ranges[validCharacters];
char c = (char)rnd.Next(range.X, range.Y + 1);
if (charactersNotAllowed.IndexOf(c) == -1) // case-sensitive comparison
{
value.Append(c);
}
else
{
// the current character must be replaced because it has been excluded
i--;
}
}
}
else
{
for (int i = 0; i < length; i++)
// for each index in the string value generate a random character
{
// randomly choose a set of characters and get the character range for that set
Point range = ranges[(CaptchaCharacterSet)validCharSetValues[rnd.Next(0, validCharSetValues.Count)]];
value.Append((char)rnd.Next(range.X, range.Y + 1));
}
}
return(value.ToString());
}
/// <summary> /// When implemented by a derived type, creates an instance of a type that derives from <see cref="AutoInputProtectionImage"/> /// that generates an image of the specified <paramref name="size"/> using the specified <paramref name="textProvider"/>. /// </summary> /// <remarks> /// <para> /// This overload is used by the <see cref="AutoInputProtectionControl"/> control. /// </para> /// <para> /// A derived type can call <see cref="GenerateImage(Size,AutoInputProtectionTextProvider)"/> to create an instance of /// <see cref="PartitionedAutoInputProtectionImage"/>, which can then be returned to the caller immediately or it can be wrapped by a specialied class that /// is returned instead. Alternatively, a derived type may override <see cref="GenerateImage(Size,AutoInputProtectionTextProvider)"/> to create a custom /// implementation that is then returned by this method as is. /// </para> /// </remarks> /// <seealso cref="AutoInputProtection.GenerateAutoInputProtectionImage"/> /// <seealso cref="GenerateAutoInputProtectionImage"/> /// <param name="size">The dimensions of the image.</param> /// <param name="textProvider"><see cref="AutoInputProtectionTextProvider"/> implementation to be used by the <see cref="AutoInputProtectionImage"/> implementation that is created.</param> /// <returns>An <see cref="AutoInputProtectionImage"/> implementation that can generate an image of the specified <paramref name="size"/> using the specified /// <paramref name="textProvider"/>.</returns> public abstract override VerificationCodeImage GenerateRandomAutoInputProtectionImage(Size size, VerificationCodeTextProvider textProvider, CaptchaCharacterSet characterSet, int? maximumCharacters, int? minimumCharacters);
protected BackgroundVerificationCodeImage(Size size, VerificationCodeTextProvider textProvider, CaptchaCharacterSet characterSet, int? maximumCharacters, int? minimumCharacters)
: base(size, textProvider, characterSet, maximumCharacters, minimumCharacters)
{
}
/// <summary>
/// Returns a string of random characters from the specified set of charactersAllowed, excluding
/// the characters in charactersNotAllowed, with a length that is between the
/// specified minLengthand maxLength values, inclusive.
/// </summary>
public static string Create(int minLength, int maxLength, CaptchaCharacterSet charactersAllowed, string charactersNotAllowed)
{
if (minLength < 0)
throw new ArgumentOutOfRangeException("minLength", minLength, "Errors.PositiveIntOrZeroRequired");
if (maxLength < minLength)
throw new ArgumentOutOfRangeException("maxLength", maxLength,
string.Format(System.Globalization.CultureInfo.CurrentUICulture, "Errors.RandomString_MaxLessThanMin", minLength));
List<int> validCharSetValues = new List<int>((int[])Enum.GetValues(typeof(CaptchaCharacterSet)));
for (int i = 0; i < validCharSetValues.Count; )
// for each index in the array of CharacterSet constant values remove
// the ones that aren't bit-aligned or aren't selected in charSets
{
int csVal = validCharSetValues[i];
if (!IsBitAligned(csVal) || (csVal & (int)charactersAllowed) == 0)
{
validCharSetValues.RemoveAt(i);
continue;
}
i++;
}
Random rnd = new Random();
int length = rnd.Next(minLength, maxLength + 1);
if (length == 0)
return string.Empty;
StringBuilder value = new StringBuilder(length);
if (!string.IsNullOrEmpty(charactersNotAllowed))
{
for (int i = 0; i < length; i++)
// for each index in the string value generate a random character
{
CaptchaCharacterSet validCharacters = (CaptchaCharacterSet)validCharSetValues[rnd.Next(0, validCharSetValues.Count)];
Point range = ranges[validCharacters];
char c = (char)rnd.Next(range.X, range.Y + 1);
if (charactersNotAllowed.IndexOf(c) == -1) // case-sensitive comparison
value.Append(c);
else
// the current character must be replaced because it has been excluded
i--;
}
}
else
{
for (int i = 0; i < length; i++)
// for each index in the string value generate a random character
{
// randomly choose a set of characters and get the character range for that set
Point range = ranges[(CaptchaCharacterSet)validCharSetValues[rnd.Next(0, validCharSetValues.Count)]];
value.Append((char)rnd.Next(range.X, range.Y + 1));
}
}
return value.ToString();
}
/// <summary>
/// 图像的生成和缓存
/// </summary>
/// <param name="context">httpcontext</param>
/// <param name="size">图像大小</param>
/// <param name="requestTimeoutSeconds">过期时间</param>
/// <param name="publicKey">生成的publicKey</param>
/// <param name="characterSet">字符集</param>
/// <param name="enableLineNoise">是否有干扰线</param>
/// <param name="maximumCharacters">最大字符长度</param>
/// <param name="minimumCharacters">最小字符长度</param>
/// <returns></returns>
public static VerificationCodeImage GenerateAndCacheImage(HttpContextBase context, Size size, int requestTimeoutSeconds, out string publicKey, CaptchaCharacterSet characterSet, bool enableLineNoise, int? minimumCharacters, int? maximumCharacters)
{
MemoryStream stream;
VerificationCodeImage aipImage;
int attempt = 0;
string text;
do
{
aipImage = GenerateRandomAutoInputProtectionImage(size, characterSet, maximumCharacters, minimumCharacters);
text = aipImage.Text;
}
while (!CreateImageStream(ref attempt, context, aipImage, enableLineNoise, out stream));
lock (GenerateAndCacheImageLockObj)
{
publicKey = GeneratePublicCacheKey(context, text);
string imageKey = GetCacheKeyForImage(publicKey);
cacheService.Add(imageKey, stream.ToArray(), new TimeSpan(0, 5, 0));
}
return aipImage;
}
public static VerificationCodeImage GenerateAndCacheImage(HttpContextBase context, Size size, int timeout,
out string key, CaptchaCharacterSet captchaCharacterSet, bool enableLineNoise, int minmunCharacter,
int maxmunCharacter)
{
MemoryStream stream;
VerificationCodeImage apiImage;
int attempt = 0;
string text;
do
{
apiImage = GenerateRandomAutoProtectionImage(size, captchaCharacterSet, maxmunCharacter, minmunCharacter);
text = apiImage.Text;
} while (CreateImageStream(ref attempt, context, apiImage, enableLineNoise, out stream));
lock (VerificationCodeImageLockObj)
{
key = GeneratePublishCacheKey(context, text);
string imagekey = GetCacheKeyForImage(key);
//缓存5分钟
//cacheService.Add(imagekey,stream.ToArray(),new TimeSpan(0,5,0));
}
return apiImage;
}
/// <summary>
/// 生成字符集
/// </summary>
/// <param name="characterSet"></param>
/// <returns></returns>
public override string GenerateRandomAutoInputProtectionText(CaptchaCharacterSet characterSet)
{
return(VerificationCodeRandomString.Create(MinimumCharacters, MaximumCharacters, characterSet, null));
}
/// <summary> /// When implemented by a derived type, creates an instance of a type that derives from <see cref="AutoInputProtectionImage"/> /// that generates an image of the specified <paramref name="size"/> using the specified <paramref name="textProvider"/>. /// </summary> /// <remarks> /// This overload is used by the <see cref="AutoInputProtectionControl"/> control. /// </remarks> /// <seealso cref="AutoInputProtection.GenerateAutoInputProtectionImage"/> /// <seealso cref="GenerateAutoInputProtectionImage"/> /// <param name="size">The dimensions of the image.</param> /// <param name="textProvider"><see cref="AutoInputProtectionTextProvider"/> implementation to be used by the <see cref="AutoInputProtectionImage"/> implementation that is created.</param> /// <returns>An <see cref="AutoInputProtectionImage"/> implementation that can generate an image of the specified <paramref name="size"/> using the specified /// <paramref name="textProvider"/>.</returns> public abstract VerificationCodeImage GenerateRandomAutoInputProtectionImage(Size size, VerificationCodeTextProvider textProvider, CaptchaCharacterSet characterSet, int?maximumCharacters, int?minimumCharacters);
/// <summary>
/// 生成干扰图像
/// </summary>
/// <param name="name"></param>
/// <param name="size"></param>
/// <param name="textProvider"></param>
/// <param name="characterSet"></param>
/// <param name="maximumCharacters"></param>
/// <param name="minimumCharacters"></param>
/// <returns></returns>
public override VerificationCodeImage GenerateAutoInputProtectionImage(string name, Size size, VerificationCodeTextProvider textProvider, CaptchaCharacterSet characterSet, int?maximumCharacters, int?minimumCharacters)
{
LineNoiseVerificationCodeImage image = new LineNoiseVerificationCodeImage(size, textProvider, colors, characterSet, maximumCharacters, minimumCharacters);
// code added after 1.0.0 RTW:
if (Margin != -1)
{
image.Margin = Margin;
}
if (MinimumCharacterRotation != -1)
{
image.MinimumCharacterRotation = MinimumCharacterRotation;
}
if (MaximumCharacterRotation != -1)
{
image.MaximumCharacterRotation = MaximumCharacterRotation;
}
return(image);
}
/// <summary>
/// 创建验证码实体对象
/// </summary>
/// <param name="size"></param>
/// <param name="characterSet"></param>
/// <param name="maxmunCharacter"></param>
/// <param name="minmunCharacter"></param>
/// <returns></returns>
private static VerificationCodeImage GenerateRandomAutoProtectionImage(Size size,
CaptchaCharacterSet characterSet, int maxmunCharacter, int minmunCharacter)
{
if (size.Width < 1 || size.Height < 1) throw new ArgumentOutOfRangeException("绘制验证码size的不正确");
EnsureProviders();
VerificationCodeImage image = null;
lock (VerificationCodeImageLockObj)
{
image = imageProvider.GenerateRandomAutoInputProtectionImage(size,textProvider,characterSet,maxmunCharacter,minmunCharacter);
}
image.filters = FilterProviderCollection;
return image;
}
/// <summary>
/// 生成图像
/// </summary>
/// <param name="size"></param>
/// <param name="textProvider"></param>
/// <param name="characterSet"></param>
/// <param name="maximumCharacters"></param>
/// <param name="minimumCharacters"></param>
/// <returns></returns>
public override VerificationCodeImage GenerateRandomAutoInputProtectionImage(Size size, VerificationCodeTextProvider textProvider, CaptchaCharacterSet characterSet, int?maximumCharacters, int?minimumCharacters)
{
return(GenerateAutoInputProtectionImage(null, size, textProvider, characterSet, maximumCharacters, minimumCharacters));
}
private static VerificationCodeImage GenerateRandomAutoInputProtectionImage(Size size, CaptchaCharacterSet characterSet, int?maximumCharacters, int?minimumCharacters)
{
if (size.Width < 1 || size.Height < 1)
{
throw new ArgumentOutOfRangeException("size", size, "Errors.SizePositiveIntRequired");
}
EnsureProviders();
VerificationCodeImage image = null;
lock (VerificationCodeImageLockObj)
{
image = imageProvider.GenerateRandomAutoInputProtectionImage(size, textProvider, characterSet, maximumCharacters, minimumCharacters);
}
image.filters = filterProviders;
return(image);
}
protected BackgroundVerificationCodeImage(Size size, VerificationCodeTextProvider textProvider, CaptchaCharacterSet characterSet, int?maximumCharacters, int?minimumCharacters)
: base(size, textProvider, characterSet, maximumCharacters, minimumCharacters)
{
}
