URL Class Reference

Represents a URL and has a bunch of useful functions to manipulate it. More...

#include <juce_URL.h>

Classes
class	DownloadTask
	Represents a download task. More...
struct	DownloadTaskListener
	Used to receive callbacks for download progress. More...
class	DownloadTaskOptions
	Holds options that can be specified when starting a new download with downloadToFile(). More...
class	InputStreamOptions
	Class used to create a set of options to pass to the createInputStream() method. More...

Public Types
enum class	ParameterHandling { inAddress , inPostData }

Public Member Functions
	URL ()
	Creates an empty URL.
	URL (const String &url)
	Creates a URL from a string.
	URL (File localFile)
	Creates URL referring to a local file on your disk using the file:// scheme.
bool	operator== (const URL &) const
	Compares two URLs.
bool	operator!= (const URL &) const
String	toString (bool includeGetParameters) const
	Returns a string version of the URL.
bool	isEmpty () const noexcept
	Returns true if the URL is an empty string.
bool	isWellFormed () const
	True if it seems to be valid.
String	getDomain () const
	Returns just the domain part of the URL.
String	getSubPath (bool includeGetParameters=false) const
	Returns the path part of the URL.
String	getQueryString () const
	If any parameters are set, returns these URL-encoded, including the "?" prefix.
String	getAnchorString () const
	If any anchor is set, returns URL-encoded anchor, including the "#" prefix.
String	getScheme () const
	Returns the scheme of the URL.
bool	isLocalFile () const
	Returns true if this URL refers to a local file.
File	getLocalFile () const
	Returns the file path of the local file to which this URL refers to.
String	getFileName () const
	Returns the file name.
int	getPort () const
	Attempts to read a port number from the URL.
String	getOrigin () const
	Returns the origin of a resource reachable on this URL.
URL	withNewDomainAndPath (const String &newFullPath) const
	Returns a new version of this URL with a different domain and path.
URL	withNewSubPath (const String &newPath) const
	Returns a new version of this URL with a different sub-path.
URL	getParentURL () const
	Attempts to return a URL which is the parent folder containing this URL.
URL	getChildURL (const String &subPath) const
	Returns a new URL that refers to a sub-path relative to this one.
URL	withParameter (const String &parameterName, const String &parameterValue) const
	Returns a copy of this URL, with a GET or POST parameter added to the end.
URL	withParameters (const StringPairArray &parametersToAdd) const
	Returns a copy of this URL, with a set of GET or POST parameters added.
URL	withAnchor (const String &anchor) const
	Returns a copy of this URL, with an anchor added to the end of the URL.
URL	withFileToUpload (const String &parameterName, const File &fileToUpload, const String &mimeType) const
	Returns a copy of this URL, with a file-upload type parameter added to it.
URL	withDataToUpload (const String &parameterName, const String &filename, const MemoryBlock &fileContentToUpload, const String &mimeType) const
	Returns a copy of this URL, with a file-upload type parameter added to it.
const StringArray &	getParameterNames () const noexcept
	Returns an array of the names of all the URL's parameters.
const StringArray &	getParameterValues () const noexcept
	Returns an array of the values of all the URL's parameters.
URL	withPOSTData (const String &postData) const
	Returns a copy of this URL, with a block of data to send as the POST data.
URL	withPOSTData (const MemoryBlock &postData) const
	Returns a copy of this URL, with a block of data to send as the POST data.
String	getPostData () const
	Returns the data that was set using withPOSTData().
const MemoryBlock &	getPostDataAsMemoryBlock () const noexcept
	Returns the data that was set using withPOSTData() as a MemoryBlock.
bool	launchInDefaultBrowser () const
	Tries to launch the system's default browser to open the URL.
std::unique_ptr< InputStream >	createInputStream (const InputStreamOptions &options) const
	Attempts to open a stream that can read from this URL.
std::unique_ptr< OutputStream >	createOutputStream () const
	Attempts to open an output stream to a URL for writing.
std::unique_ptr< DownloadTask >	downloadToFile (const File &targetLocation, String extraHeaders=String(), DownloadTaskListener *listener=nullptr, bool usePostCommand=false)
	This function is replaced by a new overload accepting a DownloadTaskOptions argument.
std::unique_ptr< DownloadTask >	downloadToFile (const File &targetLocation, const DownloadTaskOptions &options)
	Download the URL to a file.
bool	readEntireBinaryStream (MemoryBlock &destData, bool usePostCommand=false) const
	Tries to download the entire contents of this URL into a binary data block.
String	readEntireTextStream (bool usePostCommand=false) const
	Tries to download the entire contents of this URL as a string.
std::unique_ptr< XmlElement >	readEntireXmlStream (bool usePostCommand=false) const
	Tries to download the entire contents of this URL and parse it as XML.

Static Public Member Functions
static bool	isProbablyAWebsiteURL (const String &possibleURL)
	Takes a guess as to whether a string might be a valid website address.
static bool	isProbablyAnEmailAddress (const String &possibleEmailAddress)
	Takes a guess as to whether a string might be a valid email address.
static String	addEscapeChars (const String &stringToAddEscapeCharsTo, bool isParameter, bool roundBracketsAreLegal=true)
	Adds escape sequences to a string to encode any characters that aren't legal in a URL.
static String	removeEscapeChars (const String &stringToRemoveEscapeCharsFrom)
	Replaces any escape character sequences in a string with their original character codes.
static URL	createWithoutParsing (const String &url)
	Returns a URL without attempting to remove any embedded parameters from the string.

Detailed Description

Represents a URL and has a bunch of useful functions to manipulate it.

This class can be used to launch URLs in browsers, and also to create InputStreams that can read from remote HTTP or FTP sources.

Member Enumeration Documentation

ParameterHandling

enum class URL::ParameterHandling

strong

Enumerator
inAddress
inPostData

Constructor & Destructor Documentation

URL() [1/3]

URL::URL

(

)

Creates an empty URL.

URL() [2/3]

URL::URL

(

const String &

url

)

Creates a URL from a string.

This will parse any embedded parameters after a '?' character and store them in the list (see getParameterNames etc). If you don't want this to happen, you can use createWithoutParsing().

URL() [3/3]

URL::URL ( File localFile )

explicit

Creates URL referring to a local file on your disk using the file:// scheme.

Member Function Documentation

operator==()

bool URL::operator==

(

const URL &

)

const

Compares two URLs.

All aspects of the URLs must be identical for them to match, including any parameters, upload files, etc.

operator!=()

bool URL::operator!=

(

const URL &

)

const

toString()

String URL::toString

(

bool

includeGetParameters

)

const

Returns a string version of the URL.

Parameters

includeGetParameters

if this is true and any parameters have been set with the withParameter() method, then the string will have these appended on the end and URL-encoded.

See also

getQueryString

isEmpty()

bool URL::isEmpty ( ) const

noexcept

Returns true if the URL is an empty string.

isWellFormed()

bool URL::isWellFormed

(

)

const

True if it seems to be valid.

getDomain()

String URL::getDomain

(

)

const

Returns just the domain part of the URL.

e.g. for "http://www.xyz.com/foobar", this will return "www.xyz.com".

getSubPath()

String URL::getSubPath

(

bool

includeGetParameters = false

)

const

Returns the path part of the URL.

e.g. for "http://www.xyz.com/foo/bar?x=1", this will return "foo/bar".

Parameters

includeGetParameters

if this is true and any parameters have been set with the withParameter() method, then the string will have these appended on the end and URL-encoded.

See also

getQueryString

getQueryString()

String URL::getQueryString

(

)

const

If any parameters are set, returns these URL-encoded, including the "?" prefix.

getAnchorString()

String URL::getAnchorString

(

)

const

If any anchor is set, returns URL-encoded anchor, including the "#" prefix.

getScheme()

String URL::getScheme

(

)

const

Returns the scheme of the URL.

e.g. for "http://www.xyz.com/foobar", this will return "http" (it won't include the colon).

isLocalFile()

bool URL::isLocalFile

(

)

const

Returns true if this URL refers to a local file.

getLocalFile()

File URL::getLocalFile

(

)

const

Returns the file path of the local file to which this URL refers to.

If the URL does not represent a local file URL (i.e. the URL's scheme is not 'file') then this method will assert.

This method also supports converting Android's content:// URLs to local file paths.

See also

isLocalFile

getFileName()

String URL::getFileName

(

)

const

Returns the file name.

For all but Android's content:// scheme, it will simply return the last segment of the URL, e.g. for "http://www.xyz.com/foo/bar.txt", this will return "bar.txt".

For Android's content:// scheme, it will attempt to resolve the filename located under the URL.

getPort()

int URL::getPort

(

)

const

Attempts to read a port number from the URL.

Returns

the port number, or 0 if none is explicitly specified.

getOrigin()

String URL::getOrigin

(

)

const

Returns the origin of a resource reachable on this URL.

In the context of cross-origin resource sharing (CORS) a script downloaded from this URL would only be allowed to reach resources from the returned origin.

withNewDomainAndPath()

URL URL::withNewDomainAndPath ( const String & newFullPath ) const

nodiscard

Returns a new version of this URL with a different domain and path.

e.g. if the URL is "http://www.xyz.com/foo?x=1" and you call this with "abc.com/zzz", it'll return "http://abc.com/zzz?x=1".

See also

withNewSubPath

withNewSubPath()

URL URL::withNewSubPath ( const String & newPath ) const

nodiscard

Returns a new version of this URL with a different sub-path.

e.g. if the URL is "http://www.xyz.com/foo?x=1" and you call this with "bar", it'll return "http://www.xyz.com/bar?x=1".

See also

withNewDomainAndPath

getParentURL()

URL URL::getParentURL

(

)

const

Attempts to return a URL which is the parent folder containing this URL.

If there isn't a parent, this method will just return a copy of this URL.

getChildURL()

URL URL::getChildURL

(

const String &

subPath

)

const

Returns a new URL that refers to a sub-path relative to this one.

e.g. if the URL is "http://www.xyz.com/foo" and you call this with "bar", it'll return "http://www.xyz.com/foo/bar".

Note that there's no way for this method to know whether the original URL is a file or directory, so it's up to you to make sure it's a directory. It also won't attempt to be smart about the content of the childPath string, so if this string is an absolute URL, it'll still just get bolted onto the end of the path.

See also

File::getChildFile

withParameter()

URL URL::withParameter ( const String & parameterName, const String & parameterValue ) const

nodiscard

Returns a copy of this URL, with a GET or POST parameter added to the end.

Any control characters in the value will be URL-encoded.

e.g. calling "withParameter ("amount", "some fish") for the url "www.fish.com" would produce a new url whose <tt>toString (true)</tt> method would return "www.fish.com?amount=some+fish".

See also

getParameterNames, getParameterValues

withParameters()

URL URL::withParameters ( const StringPairArray & parametersToAdd ) const

nodiscard

Returns a copy of this URL, with a set of GET or POST parameters added.

This is a convenience method, equivalent to calling withParameter for each value.

See also

withParameter

withAnchor()

URL URL::withAnchor ( const String & anchor ) const

nodiscard

Returns a copy of this URL, with an anchor added to the end of the URL.

withFileToUpload()

URL URL::withFileToUpload ( const String & parameterName, const File & fileToUpload, const String & mimeType ) const

nodiscard

Returns a copy of this URL, with a file-upload type parameter added to it.

When performing a POST where one of your parameters is a binary file, this lets you specify the file.

Note that the filename is stored, but the file itself won't actually be read until this URL is later used to create a network input stream. If you want to upload data from memory, use withDataToUpload().

See also

withDataToUpload

withDataToUpload()

URL URL::withDataToUpload ( const String & parameterName, const String & filename, const MemoryBlock & fileContentToUpload, const String & mimeType ) const

nodiscard

Returns a copy of this URL, with a file-upload type parameter added to it.

When performing a POST where one of your parameters is a binary file, this lets you specify the file content.

Note that the filename parameter should not be a full path, it's just the last part of the filename.

See also

withFileToUpload

getParameterNames()

const StringArray & URL::getParameterNames ( ) const

noexcept

Returns an array of the names of all the URL's parameters.

e.g. for the url "www.fish.com?type=haddock&amount=some+fish", this array would contain two items: "type" and "amount".

You can call getParameterValues() to get the corresponding value of each parameter. Note that the list can contain multiple parameters with the same name.

See also

getParameterValues, withParameter

getParameterValues()

const StringArray & URL::getParameterValues ( ) const

noexcept

Returns an array of the values of all the URL's parameters.

e.g. for the url "www.fish.com?type=haddock&amount=some+fish", this array would contain two items: "haddock" and "some fish".

The values returned will have been cleaned up to remove any escape characters.

You can call getParameterNames() to get the corresponding name of each parameter. Note that the list can contain multiple parameters with the same name.

See also

getParameterNames, withParameter

withPOSTData() [1/2]

URL URL::withPOSTData ( const String & postData ) const

nodiscard

Returns a copy of this URL, with a block of data to send as the POST data.

If the URL already contains some POST data, this will replace it, rather than being appended to it.

If no HTTP command is set when calling createInputStream() to read from this URL and some data has been set, it will do a POST request.

withPOSTData() [2/2]

URL URL::withPOSTData ( const MemoryBlock & postData ) const

nodiscard

Returns a copy of this URL, with a block of data to send as the POST data.

If the URL already contains some POST data, this will replace it, rather than being appended to it.

If no HTTP command is set when calling createInputStream() to read from this URL and some data has been set, it will do a POST request.

getPostData()

String URL::getPostData

(

)

const

Returns the data that was set using withPOSTData().

getPostDataAsMemoryBlock()

const MemoryBlock & URL::getPostDataAsMemoryBlock ( ) const

noexcept

Returns the data that was set using withPOSTData() as a MemoryBlock.

launchInDefaultBrowser()

bool URL::launchInDefaultBrowser

(

)

const

Tries to launch the system's default browser to open the URL.

Returns

true if this seems to have worked.

isProbablyAWebsiteURL()

static bool URL::isProbablyAWebsiteURL ( const String & possibleURL )

static

Takes a guess as to whether a string might be a valid website address.

This isn't foolproof!

isProbablyAnEmailAddress()

static bool URL::isProbablyAnEmailAddress ( const String & possibleEmailAddress )

static

Takes a guess as to whether a string might be a valid email address.

This isn't foolproof!

createInputStream()

std::unique_ptr< InputStream > URL::createInputStream

(

const InputStreamOptions &

options

)

const

Attempts to open a stream that can read from this URL.

Note that this method will block until the first byte of data has been received or an error has occurred.

Note that on some platforms (Android, for example) it's not permitted to do any network action from the message thread, so you must only call it from a background thread.

Unless the URL represents a local file, this method returns an instance of a WebInputStream. You can use dynamic_cast to cast the return value to a WebInputStream which allows you more fine-grained control of the transfer process.

If the URL represents a local file, then this method simply returns a FileInputStream.

Parameters

options

a set of options that will be used when opening the stream.

Returns

a valid input stream, or nullptr if there was an error trying to open it.

createOutputStream()

std::unique_ptr< OutputStream > URL::createOutputStream

(

)

const

Attempts to open an output stream to a URL for writing.

This method can only be used for certain scheme types such as local files and content:// URIs on Android.

downloadToFile() [1/2]

std::unique_ptr< DownloadTask > URL::downloadToFile	(	const File &	targetLocation,
		String	extraHeaders = String(),
		DownloadTaskListener *	listener = nullptr,
		bool	usePostCommand = false )

This function is replaced by a new overload accepting a DownloadTaskOptions argument.

downloadToFile() [2/2]

std::unique_ptr< DownloadTask > URL::downloadToFile	(	const File &	targetLocation,
		const DownloadTaskOptions &	options )

Download the URL to a file.

This method attempts to download the URL to a given file location.

Using this method to download files on mobile is less flexible but more reliable than using createInputStream or WebInputStreams as it will attempt to download the file using a native OS background network task. Such tasks automatically deal with network re-connections and continuing your download while your app is suspended.

readEntireBinaryStream()

bool URL::readEntireBinaryStream	(	MemoryBlock &	destData,
		bool	usePostCommand = false ) const

Tries to download the entire contents of this URL into a binary data block.

If it succeeds, this will return true and append the data it read onto the end of the memory block.

Note that on some platforms (Android, for example) it's not permitted to do any network action from the message thread, so you must only call it from a background thread.

Parameters

destData	the memory block to append the new data to.
usePostCommand	whether to use a POST command to get the data (uses a GET command if this is false).

See also

readEntireTextStream, readEntireXmlStream

readEntireTextStream()

String URL::readEntireTextStream

(

bool

usePostCommand = false

)

const

Tries to download the entire contents of this URL as a string.

If it fails, this will return an empty string, otherwise it will return the contents of the downloaded file. If you need to distinguish between a read operation that fails and one that returns an empty string, you'll need to use a different method, such as readEntireBinaryStream().

Note that on some platforms (Android, for example) it's not permitted to do any network action from the message thread, so you must only call it from a background thread.

Parameters

usePostCommand

whether to use a POST command to get the data (uses a GET command if this is false).

See also

readEntireBinaryStream, readEntireXmlStream

readEntireXmlStream()

std::unique_ptr< XmlElement > URL::readEntireXmlStream

(

bool

usePostCommand = false

)

const

Tries to download the entire contents of this URL and parse it as XML.

If it fails, or if the text that it reads can't be parsed as XML, this will return nullptr.

Note that on some platforms (Android, for example) it's not permitted to do any network action from the message thread, so you must only call it from a background thread.

Parameters

usePostCommand

whether to use a POST command to get the data (uses a GET command if this is false).

See also

readEntireBinaryStream, readEntireTextStream

addEscapeChars()

static String URL::addEscapeChars ( const String & stringToAddEscapeCharsTo, bool isParameter, bool roundBracketsAreLegal = true )

static

Adds escape sequences to a string to encode any characters that aren't legal in a URL.

E.g. any spaces will be replaced with "%20".

This is the opposite of removeEscapeChars().

Parameters

stringToAddEscapeCharsTo	the string to escape.
isParameter	if true then the string is going to be used as a parameter, so it also encodes '$' and ',' (which would otherwise be legal in a URL.
roundBracketsAreLegal	technically round brackets are ok in URLs, however, some servers (like AWS) also want round brackets to be escaped.

See also

removeEscapeChars

removeEscapeChars()

static String URL::removeEscapeChars ( const String & stringToRemoveEscapeCharsFrom )

static

Replaces any escape character sequences in a string with their original character codes.

E.g. any instances of "%20" will be replaced by a space.

This is the opposite of addEscapeChars().

See also

addEscapeChars

createWithoutParsing()

static URL URL::createWithoutParsing ( const String & url )

static

Returns a URL without attempting to remove any embedded parameters from the string.

This may be necessary if you need to create a request that involves both POST parameters and parameters which are embedded in the URL address itself.

---

The documentation for this class was generated from the following file:

• juce_URL.h