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## com.google.gwt.safehtml.shared
Class UriUtils

    java.lang.Object
      com.google.gwt.safehtml.shared.UriUtils

    public final class UriUtils

extends java.lang.Object

Utility class containing static methods for validating and sanitizing URIs.

Method Summary
`static java.lang.String` | `encode(java.lang.String uri)` Encodes the URL.
`static java.lang.String` | `encodeAllowEscapes(java.lang.String uri)` Encodes the URL, preserving existing %-escapes.
`static java.lang.String` | `extractScheme(java.lang.String uri)` Extracts the scheme of a URI.
`static SafeUri` | `fromSafeConstant(java.lang.String s)` Returns a `SafeUri` constructed from a value that is fully under the control of the program, e.g., a constant.
`static SafeUri` | `fromString(java.lang.String s)` Returns a `SafeUri` obtained by sanitizing the provided string.
`static SafeUri` | `fromTrustedString(java.lang.String s)` Returns a `SafeUri` constructed from a trusted string, i.e., without sanitizing the string.
`static boolean` | `isSafeUri(java.lang.String uri)` Determines if a `String` is safe to use as the value of a URI-valued HTML attribute such as `src` or `href`.
`static java.lang.String` | `sanitizeUri(java.lang.String uri)` Sanitizes a URI.
`static SafeUri` | `unsafeCastFromUntrustedString(java.lang.String s)` Deprecated. This method is intended only for use in APIs that use `SafeUri` to represent URIs, but for backwards compatibility have methods that accept URI parameters as plain strings.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Method Detail

### encode

    public static java.lang.String encode(java.lang.String uri)

  Encodes the URL.

  In client code, this method delegates to `URL.encode(String)` and then unescapes brackets, as they might be used for IPv6 addresses.

  Parameters:
    `uri` - the URL to encode
  Returns:
    the %-escaped URL

### encodeAllowEscapes

    public static java.lang.String encodeAllowEscapes(java.lang.String uri)

  Encodes the URL, preserving existing %-escapes.

  Parameters:
    `uri` - the URL to encode
  Returns:
    the %-escaped URL

### extractScheme

    public static java.lang.String extractScheme(java.lang.String uri)

  Extracts the scheme of a URI.

  Parameters:
    `uri` - the URI to extract the scheme from
  Returns:
    the URI's scheme, or `null` if the URI does not have one

### fromSafeConstant

    public static SafeUri fromSafeConstant(java.lang.String s)

  Returns a `SafeUri` constructed from a value that is fully under the control of the program, e.g., a constant.

  The string is not sanitized and no checks are performed. The assumption that the resulting value adheres to the `SafeUri` type contract is entirely based on the argument being fully under program control and not being derived from a program input.

  Convention of use: This method must only be invoked on values that are fully under the program's control, such as string literals.

  Parameters:
    `s` - the input String
  Returns:
    a SafeUri instance

### fromString

    public static SafeUri fromString(java.lang.String s)

  Returns a `SafeUri` obtained by sanitizing the provided string.

  The input string is sanitized using `sanitizeUri(String)`.

  Parameters:
    `s` - the input String
  Returns:
    a SafeUri instance

### fromTrustedString

    public static SafeUri fromTrustedString(java.lang.String s)

  Returns a `SafeUri` constructed from a trusted string, i.e., without sanitizing the string. No checks are performed. The calling code should be carefully reviewed to ensure the argument meets the SafeUri contract.

  Parameters:
    `s` - the input String
  Returns:
    a SafeUri instance

### isSafeUri

    public static boolean isSafeUri(java.lang.String uri)

  Determines if a `String` is safe to use as the value of a URI-valued HTML attribute such as `src` or `href`.

  In this context, a URI is safe if it can be established that using it as the value of a URI-valued HTML attribute such as `src` or `href` cannot result in script execution. Specifically, this method deems a URI safe if it either does not have a scheme, or its scheme is one of `http, https, ftp, mailto`.

  Parameters:
    `uri` - the URI to validate
  Returns:
    `true` if `uri` is safe in the above sense; `false` otherwise

### sanitizeUri

    public static java.lang.String sanitizeUri(java.lang.String uri)

  Sanitizes a URI.

  This method returns the URI provided if it is safe to use as the the value of a URI-valued HTML attribute according to `isSafeUri(java.lang.String)`, or the URI "`#`" otherwise.

  Parameters:
    `uri` - the URI to sanitize
  Returns:
    a sanitized String

### unsafeCastFromUntrustedString

    @Deprecated
    public static SafeUri unsafeCastFromUntrustedString(java.lang.String s)

  Deprecated. This method is intended only for use in APIs that use `SafeUri` to represent URIs, but for backwards compatibility have methods that accept URI parameters as plain strings.

  Returns a `SafeUri` constructed from an untrusted string but without sanitizing it. Despite this method creating a SafeUri instance, no checks are performed, so the returned SafeUri is absolutely NOT guaranteed to be safe!

  Parameters:
    `s` - the input String
  Returns:
    a SafeUri instance

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