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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc.Routing;
using Microsoft.AspNetCore.Routing;
namespace Microsoft.AspNetCore.Mvc;
/// <summary>
/// Static class for url helper extension methods.
/// </summary>
public static class UrlHelperExtensions
{
/// <summary>
/// Generates a URL with a path for an action method.
/// </summary>
/// <param name="helper">The <see cref="IUrlHelper"/>.</param>
/// <returns>The generated URL.</returns>
public static string? Action(this IUrlHelper helper)
{
ArgumentNullException.ThrowIfNull(helper);
return helper.Action(
action: null,
controller: null,
values: null,
protocol: null,
host: null,
fragment: null);
}
/// <summary>
/// Generates a URL with a path for an action method, which contains the specified
/// <paramref name="action"/> name.
/// </summary>
/// <param name="helper">The <see cref="IUrlHelper"/>.</param>
/// <param name="action">The name of the action method.</param>
/// <returns>The generated URL.</returns>
public static string? Action(this IUrlHelper helper, string? action)
{
ArgumentNullException.ThrowIfNull(helper);
return helper.Action(action, controller: null, values: null, protocol: null, host: null, fragment: null);
}
/// <summary>
/// Generates a URL with a path for an action method, which contains the specified
/// <paramref name="action"/> name and route <paramref name="values"/>.
/// </summary>
/// <param name="helper">The <see cref="IUrlHelper"/>.</param>
/// <param name="action">The name of the action method.</param>
/// <param name="values">An object that contains route values.</param>
/// <returns>The generated URL.</returns>
public static string? Action(this IUrlHelper helper, string? action, object? values)
{
ArgumentNullException.ThrowIfNull(helper);
return helper.Action(action, controller: null, values: values, protocol: null, host: null, fragment: null);
}
/// <summary>
/// Generates a URL with a path for an action method, which contains the specified
/// <paramref name="action"/> and <paramref name="controller"/> names.
/// </summary>
/// <param name="helper">The <see cref="IUrlHelper"/>.</param>
/// <param name="action">The name of the action method.</param>
/// <param name="controller">The name of the controller.</param>
/// <returns>The generated URL.</returns>
public static string? Action(this IUrlHelper helper, string? action, string? controller)
{
ArgumentNullException.ThrowIfNull(helper);
return helper.Action(action, controller, values: null, protocol: null, host: null, fragment: null);
}
/// <summary>
/// Generates a URL with a path for an action method, which contains the specified
/// <paramref name="action"/> name, <paramref name="controller"/> name, and route <paramref name="values"/>.
/// </summary>
/// <param name="helper">The <see cref="IUrlHelper"/>.</param>
/// <param name="action">The name of the action method.</param>
/// <param name="controller">The name of the controller.</param>
/// <param name="values">An object that contains route values.</param>
/// <returns>The generated URL.</returns>
public static string? Action(this IUrlHelper helper, string? action, string? controller, object? values)
{
ArgumentNullException.ThrowIfNull(helper);
return helper.Action(action, controller, values, protocol: null, host: null, fragment: null);
}
/// <summary>
/// Generates a URL with a path for an action method, which contains the specified
/// <paramref name="action"/> name, <paramref name="controller"/> name, route <paramref name="values"/>, and
/// <paramref name="protocol"/> to use. See the remarks section for important security information.
/// </summary>
/// <param name="helper">The <see cref="IUrlHelper"/>.</param>
/// <param name="action">The name of the action method.</param>
/// <param name="controller">The name of the controller.</param>
/// <param name="values">An object that contains route values.</param>
/// <param name="protocol">The protocol for the URL, such as "http" or "https".</param>
/// <returns>The generated URL.</returns>
/// <remarks>
/// <para>
/// This method uses the value of <see cref="HttpRequest.Host"/> to populate the host section of the generated URI.
/// Relying on the value of the current request can allow untrusted input to influence the resulting URI unless
/// the <c>Host</c> header has been validated. See the deployment documentation for instructions on how to properly
/// validate the <c>Host</c> header in your deployment environment.
/// </para>
/// </remarks>
public static string? Action(
this IUrlHelper helper,
string? action,
string? controller,
object? values,
string? protocol)
{
ArgumentNullException.ThrowIfNull(helper);
return helper.Action(action, controller, values, protocol, host: null, fragment: null);
}
/// <summary>
/// Generates a URL with a path for an action method, which contains the specified
/// <paramref name="action"/> name, <paramref name="controller"/> name, route <paramref name="values"/>,
/// <paramref name="protocol"/> to use, and <paramref name="host"/> name.
/// Generates an absolute URL if the <paramref name="protocol"/> and <paramref name="host"/> are
/// non-<c>null</c>. See the remarks section for important security information.
/// </summary>
/// <param name="helper">The <see cref="IUrlHelper"/>.</param>
/// <param name="action">The name of the action method.</param>
/// <param name="controller">The name of the controller.</param>
/// <param name="values">An object that contains route values.</param>
/// <param name="protocol">The protocol for the URL, such as "http" or "https".</param>
/// <param name="host">The host name for the URL.</param>
/// <returns>The generated URL.</returns>
/// <remarks>
/// <para>
/// The value of <paramref name="host"/> should be a trusted value. Relying on the value of the current request
/// can allow untrusted input to influence the resulting URI unless the <c>Host</c> header has been validated.
/// See the deployment documentation for instructions on how to properly validate the <c>Host</c> header in
/// your deployment environment.
/// </para>
/// </remarks>
public static string? Action(
this IUrlHelper helper,
string? action,
string? controller,
object? values,
string? protocol,
string? host)
{
ArgumentNullException.ThrowIfNull(helper);
return helper.Action(action, controller, values, protocol, host, fragment: null);
}
/// <summary>
/// Generates a URL with a path for an action method, which contains the specified
/// <paramref name="action"/> name, <paramref name="controller"/> name, route <paramref name="values"/>,
/// <paramref name="protocol"/> to use, <paramref name="host"/> name, and <paramref name="fragment"/>.
/// Generates an absolute URL if the <paramref name="protocol"/> and <paramref name="host"/> are
/// non-<c>null</c>. See the remarks section for important security information.
/// </summary>
/// <param name="helper">The <see cref="IUrlHelper"/>.</param>
/// <param name="action">The name of the action method.</param>
/// <param name="controller">The name of the controller.</param>
/// <param name="values">An object that contains route values.</param>
/// <param name="protocol">The protocol for the URL, such as "http" or "https".</param>
/// <param name="host">The host name for the URL.</param>
/// <param name="fragment">The fragment for the URL.</param>
/// <returns>The generated URL.</returns>
/// <remarks>
/// <para>
/// The value of <paramref name="host"/> should be a trusted value. Relying on the value of the current request
/// can allow untrusted input to influence the resulting URI unless the <c>Host</c> header has been validated.
/// See the deployment documentation for instructions on how to properly validate the <c>Host</c> header in
/// your deployment environment.
/// </para>
/// </remarks>
public static string? Action(
this IUrlHelper helper,
string? action,
string? controller,
object? values,
string? protocol,
string? host,
string? fragment)
{
ArgumentNullException.ThrowIfNull(helper);
return helper.Action(new UrlActionContext()
{
Action = action,
Controller = controller,
Host = host,
Values = values,
Protocol = protocol,
Fragment = fragment
});
}
/// <summary>
/// Generates a URL with an absolute path for the specified route <paramref name="values"/>.
/// </summary>
/// <param name="helper">The <see cref="IUrlHelper"/>.</param>
/// <param name="values">An object that contains route values.</param>
/// <returns>The generated URL.</returns>
public static string? RouteUrl(this IUrlHelper helper, object? values)
{
ArgumentNullException.ThrowIfNull(helper);
return helper.RouteUrl(routeName: null, values: values, protocol: null, host: null, fragment: null);
}
/// <summary>
/// Generates a URL with an absolute path for the specified <paramref name="routeName"/>.
/// </summary>
/// <param name="helper">The <see cref="IUrlHelper"/>.</param>
/// <param name="routeName">The name of the route that is used to generate URL.</param>
/// <returns>The generated URL.</returns>
public static string? RouteUrl(this IUrlHelper helper, string? routeName)
{
ArgumentNullException.ThrowIfNull(helper);
return helper.RouteUrl(routeName, values: null, protocol: null, host: null, fragment: null);
}
/// <summary>
/// Generates a URL with an absolute path for the specified <paramref name="routeName"/> and route
/// <paramref name="values"/>.
/// </summary>
/// <param name="helper">The <see cref="IUrlHelper"/>.</param>
/// <param name="routeName">The name of the route that is used to generate URL.</param>
/// <param name="values">An object that contains route values.</param>
/// <returns>The generated URL.</returns>
public static string? RouteUrl(this IUrlHelper helper, string? routeName, object? values)
{
ArgumentNullException.ThrowIfNull(helper);
return helper.RouteUrl(routeName, values, protocol: null, host: null, fragment: null);
}
/// <summary>
/// Generates a URL with an absolute path for the specified route <paramref name="routeName"/> and route
/// <paramref name="values"/>, which contains the specified <paramref name="protocol"/> to use. See the
/// remarks section for important security information.
/// </summary>
/// <param name="helper">The <see cref="IUrlHelper"/>.</param>
/// <param name="routeName">The name of the route that is used to generate URL.</param>
/// <param name="values">An object that contains route values.</param>
/// <param name="protocol">The protocol for the URL, such as "http" or "https".</param>
/// <returns>The generated URL.</returns>
/// <remarks>
/// <para>
/// This method uses the value of <see cref="HttpRequest.Host"/> to populate the host section of the generated URI.
/// Relying on the value of the current request can allow untrusted input to influence the resulting URI unless
/// the <c>Host</c> header has been validated. See the deployment documentation for instructions on how to properly
/// validate the <c>Host</c> header in your deployment environment.
/// </para>
/// </remarks>
public static string? RouteUrl(
this IUrlHelper helper,
string? routeName,
object? values,
string? protocol)
{
ArgumentNullException.ThrowIfNull(helper);
return helper.RouteUrl(routeName, values, protocol, host: null, fragment: null);
}
/// <summary>
/// Generates a URL with an absolute path for the specified route <paramref name="routeName"/> and route
/// <paramref name="values"/>, which contains the specified <paramref name="protocol"/> to use and
/// <paramref name="host"/> name. Generates an absolute URL if
/// <see cref="UrlActionContext.Protocol"/> and <see cref="UrlActionContext.Host"/> are non-<c>null</c>.
/// See the remarks section for important security information.
/// </summary>
/// <param name="helper">The <see cref="IUrlHelper"/>.</param>
/// <param name="routeName">The name of the route that is used to generate URL.</param>
/// <param name="values">An object that contains route values.</param>
/// <param name="protocol">The protocol for the URL, such as "http" or "https".</param>
/// <param name="host">The host name for the URL.</param>
/// <returns>The generated URL.</returns>
/// <remarks>
/// <para>
/// The value of <paramref name="host"/> should be a trusted value. Relying on the value of the current request
/// can allow untrusted input to influence the resulting URI unless the <c>Host</c> header has been validated.
/// See the deployment documentation for instructions on how to properly validate the <c>Host</c> header in
/// your deployment environment.
/// </para>
/// </remarks>
public static string? RouteUrl(
this IUrlHelper helper,
string? routeName,
object? values,
string? protocol,
string? host)
{
ArgumentNullException.ThrowIfNull(helper);
return helper.RouteUrl(routeName, values, protocol, host, fragment: null);
}
/// <summary>
/// Generates a URL with an absolute path for the specified route <paramref name="routeName"/> and route
/// <paramref name="values"/>, which contains the specified <paramref name="protocol"/> to use,
/// <paramref name="host"/> name and <paramref name="fragment"/>. Generates an absolute URL if
/// <see cref="UrlActionContext.Protocol"/> and <see cref="UrlActionContext.Host"/> are non-<c>null</c>.
/// See the remarks section for important security information.
/// </summary>
/// <param name="helper">The <see cref="IUrlHelper"/>.</param>
/// <param name="routeName">The name of the route that is used to generate URL.</param>
/// <param name="values">An object that contains route values.</param>
/// <param name="protocol">The protocol for the URL, such as "http" or "https".</param>
/// <param name="host">The host name for the URL.</param>
/// <param name="fragment">The fragment for the URL.</param>
/// <returns>The generated URL.</returns>
/// <remarks>
/// <para>
/// The value of <paramref name="host"/> should be a trusted value. Relying on the value of the current request
/// can allow untrusted input to influence the resulting URI unless the <c>Host</c> header has been validated.
/// See the deployment documentation for instructions on how to properly validate the <c>Host</c> header in
/// your deployment environment.
/// </para>
/// </remarks>
public static string? RouteUrl(
this IUrlHelper helper,
string? routeName,
object? values,
string? protocol,
string? host,
string? fragment)
{
ArgumentNullException.ThrowIfNull(helper);
return helper.RouteUrl(new UrlRouteContext()
{
RouteName = routeName,
Values = values,
Protocol = protocol,
Host = host,
Fragment = fragment
});
}
/// <summary>
/// Generates a URL with a relative path for the specified <paramref name="pageName"/>.
/// </summary>
/// <param name="urlHelper">The <see cref="IUrlHelper"/>.</param>
/// <param name="pageName">The page name to generate the url for.</param>
/// <returns>The generated URL.</returns>
public static string? Page(this IUrlHelper urlHelper, string? pageName)
=> Page(urlHelper, pageName, values: null);
/// <summary>
/// Generates a URL with a relative path for the specified <paramref name="pageName"/>.
/// </summary>
/// <param name="urlHelper">The <see cref="IUrlHelper"/>.</param>
/// <param name="pageName">The page name to generate the url for.</param>
/// <param name="pageHandler">The handler to generate the url for.</param>
/// <returns>The generated URL.</returns>
public static string? Page(this IUrlHelper urlHelper, string? pageName, string? pageHandler)
=> Page(urlHelper, pageName, pageHandler, values: null);
/// <summary>
/// Generates a URL with a relative path for the specified <paramref name="pageName"/>.
/// </summary>
/// <param name="urlHelper">The <see cref="IUrlHelper"/>.</param>
/// <param name="pageName">The page name to generate the url for.</param>
/// <param name="values">An object that contains route values.</param>
/// <returns>The generated URL.</returns>
public static string? Page(this IUrlHelper urlHelper, string? pageName, object? values)
=> Page(urlHelper, pageName, pageHandler: null, values: values);
/// <summary>
/// Generates a URL with a relative path for the specified <paramref name="pageName"/>.
/// </summary>
/// <param name="urlHelper">The <see cref="IUrlHelper"/>.</param>
/// <param name="pageName">The page name to generate the url for.</param>
/// <param name="pageHandler">The handler to generate the url for.</param>
/// <param name="values">An object that contains route values.</param>
/// <returns>The generated URL.</returns>
public static string? Page(
this IUrlHelper urlHelper,
string? pageName,
string? pageHandler,
object? values)
=> Page(urlHelper, pageName, pageHandler, values, protocol: null);
/// <summary>
/// Generates a URL with an absolute path for the specified <paramref name="pageName"/>. See the remarks section
/// for important security information.
/// </summary>
/// <param name="urlHelper">The <see cref="IUrlHelper"/>.</param>
/// <param name="pageName">The page name to generate the url for.</param>
/// <param name="pageHandler">The handler to generate the url for.</param>
/// <param name="values">An object that contains route values.</param>
/// <param name="protocol">The protocol for the URL, such as "http" or "https".</param>
/// <returns>The generated URL.</returns>
/// <remarks>
/// <para>
/// This method uses the value of <see cref="HttpRequest.Host"/> to populate the host section of the generated URI.
/// Relying on the value of the current request can allow untrusted input to influence the resulting URI unless
/// the <c>Host</c> header has been validated. See the deployment documentation for instructions on how to properly
/// validate the <c>Host</c> header in your deployment environment.
/// </para>
/// </remarks>
public static string? Page(
this IUrlHelper urlHelper,
string? pageName,
string? pageHandler,
object? values,
string? protocol)
=> Page(urlHelper, pageName, pageHandler, values, protocol, host: null, fragment: null);
/// <summary>
/// Generates a URL with an absolute path for the specified <paramref name="pageName"/>. See the remarks section for
/// important security information.
/// </summary>
/// <param name="urlHelper">The <see cref="IUrlHelper"/>.</param>
/// <param name="pageName">The page name to generate the url for.</param>
/// <param name="pageHandler">The handler to generate the url for.</param>
/// <param name="values">An object that contains route values.</param>
/// <param name="protocol">The protocol for the URL, such as "http" or "https".</param>
/// <param name="host">The host name for the URL.</param>
/// <returns>The generated URL.</returns>
/// <remarks>
/// <para>
/// The value of <paramref name="host"/> should be a trusted value. Relying on the value of the current request
/// can allow untrusted input to influence the resulting URI unless the <c>Host</c> header has been validated.
/// See the deployment documentation for instructions on how to properly validate the <c>Host</c> header in
/// your deployment environment.
/// </para>
/// </remarks>
public static string? Page(
this IUrlHelper urlHelper,
string? pageName,
string? pageHandler,
object? values,
string? protocol,
string? host)
=> Page(urlHelper, pageName, pageHandler, values, protocol, host, fragment: null);
/// <summary>
/// Generates a URL with an absolute path for the specified <paramref name="pageName"/>. See the remarks section for
/// important security information.
/// </summary>
/// <param name="urlHelper">The <see cref="IUrlHelper"/>.</param>
/// <param name="pageName">The page name to generate the url for.</param>
/// <param name="pageHandler">The handler to generate the url for.</param>
/// <param name="values">An object that contains route values.</param>
/// <param name="protocol">The protocol for the URL, such as "http" or "https".</param>
/// <param name="host">The host name for the URL.</param>
/// <param name="fragment">The fragment for the URL.</param>
/// <returns>The generated URL.</returns>
/// <remarks>
/// <para>
/// The value of <paramref name="host"/> should be a trusted value. Relying on the value of the current request
/// can allow untrusted input to influence the resulting URI unless the <c>Host</c> header has been validated.
/// See the deployment documentation for instructions on how to properly validate the <c>Host</c> header in
/// your deployment environment.
/// </para>
/// </remarks>
public static string? Page(
this IUrlHelper urlHelper,
string? pageName,
string? pageHandler,
object? values,
string? protocol,
string? host,
string? fragment)
{
ArgumentNullException.ThrowIfNull(urlHelper);
var routeValues = new RouteValueDictionary(values);
var ambientValues = urlHelper.ActionContext.RouteData.Values;
UrlHelperBase.NormalizeRouteValuesForPage(urlHelper.ActionContext, pageName, pageHandler, routeValues, ambientValues);
return urlHelper.RouteUrl(
routeName: null,
values: routeValues,
protocol: protocol,
host: host,
fragment: fragment);
}
/// <summary>
/// Generates an absolute URL for an action method, which contains the specified
/// <paramref name="action"/> name, <paramref name="controller"/> name, route <paramref name="values"/>,
/// <paramref name="protocol"/> to use, <paramref name="host"/> name, and <paramref name="fragment"/>.
/// Generates an absolute URL if the <paramref name="protocol"/> and <paramref name="host"/> are
/// non-<c>null</c>. See the remarks section for important security information.
/// </summary>
/// <param name="helper">The <see cref="IUrlHelper"/>.</param>
/// <param name="action">The name of the action method. When <see langword="null" />, defaults to the current executing action.</param>
/// <param name="controller">The name of the controller. When <see langword="null" />, defaults to the current executing controller.</param>
/// <param name="values">An object that contains route values.</param>
/// <param name="protocol">The protocol for the URL, such as "http" or "https".</param>
/// <param name="host">The host name for the URL.</param>
/// <param name="fragment">The fragment for the URL.</param>
/// <returns>The generated URL.</returns>
/// <remarks>
/// <para>
/// The value of <paramref name="host"/> should be a trusted value. Relying on the value of the current request
/// can allow untrusted input to influence the resulting URI unless the <c>Host</c> header has been validated.
/// See the deployment documentation for instructions on how to properly validate the <c>Host</c> header in
/// your deployment environment.
/// </para>
/// </remarks>
public static string? ActionLink(
this IUrlHelper helper,
string? action = null,
string? controller = null,
object? values = null,
string? protocol = null,
string? host = null,
string? fragment = null)
{
ArgumentNullException.ThrowIfNull(helper);
var httpContext = helper.ActionContext.HttpContext;
if (protocol == null)
{
protocol = httpContext.Request.Scheme;
}
if (host == null)
{
host = httpContext.Request.Host.ToUriComponent();
}
return Action(helper, action, controller, values, protocol, host, fragment);
}
/// <summary>
/// Generates an absolute URL for a page, which contains the specified
/// <paramref name="pageName"/>, <paramref name="pageHandler"/>, route <paramref name="values"/>,
/// <paramref name="protocol"/> to use, <paramref name="host"/> name, and <paramref name="fragment"/>.
/// Generates an absolute URL if the <paramref name="protocol"/> and <paramref name="host"/> are
/// non-<c>null</c>. See the remarks section for important security information.
/// </summary>
/// <param name="urlHelper">The <see cref="IUrlHelper"/>.</param>
/// <param name="pageName">The page name to generate the url for. When <see langword="null"/>, defaults to the current executing page.</param>
/// <param name="pageHandler">The handler to generate the url for. When <see langword="null"/>, defaults to the current executing handler.</param>
/// <param name="values">An object that contains route values.</param>
/// <param name="protocol">The protocol for the URL, such as "http" or "https".</param>
/// <param name="host">The host name for the URL.</param>
/// <param name="fragment">The fragment for the URL.</param>
/// <returns>The generated URL.</returns>
/// <remarks>
/// <para>
/// The value of <paramref name="host"/> should be a trusted value. Relying on the value of the current request
/// can allow untrusted input to influence the resulting URI unless the <c>Host</c> header has been validated.
/// See the deployment documentation for instructions on how to properly validate the <c>Host</c> header in
/// your deployment environment.
/// </para>
/// </remarks>
public static string? PageLink(
this IUrlHelper urlHelper,
string? pageName = null,
string? pageHandler = null,
object? values = null,
string? protocol = null,
string? host = null,
string? fragment = null)
{
ArgumentNullException.ThrowIfNull(urlHelper);
var httpContext = urlHelper.ActionContext.HttpContext;
if (protocol == null)
{
protocol = httpContext.Request.Scheme;
}
if (host == null)
{
host = httpContext.Request.Host.ToUriComponent();
}
return Page(urlHelper, pageName, pageHandler, values, protocol, host, fragment);
}
}
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