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com.ibm.portal.resolver.streams
Class FormDataInputStream

java.lang.Object
  java.io.InputStream
      com.ibm.portal.resolver.streams.MultipartInputStream
          com.ibm.portal.resolver.streams.FormDataInputStream

All Implemented Interfaces:

FormDataStream, MultipartStream, java.io.Closeable, java.nio.channels.Channel

public abstract class FormDataInputStream
extends MultipartInputStream
implements FormDataStream

Input stream that decodes a stream of type "multipart/form-data". This stream in particular only iterates over those pieces of the input stream with a Content-Disposition: form-data; The "name" attribute of this content disposition is available via the FormDataInputStream.Entry.getName() method. The class also automatically detects the presence of the "_charset_" parameter and uses it to correctly decode string parameters (see http://www.whatwg.org/specs/web-forms/current-work/#the-charset). The stream sequentially iterates over all parameters, and only applies the "_charset_" parameter to all subsequent parameters. The "_charset_" parameter itself is not exposed, but the current characterset can be queried via the FormDataInputStream.Entry.getCharset() method. Use the readString() method to read the complete parameter in the current characterset into a string representation. This method is appropriate for small parameter values. Use the read(Writer) method to process large parameters or wrap the InputStream into a InputStreamReader. If this stream in used in conjunction with a DataSink, make sure to protect potentially harmful operations with a nonce. The nonce should be part of the stream as the hidden input field "_csrf_token_" and will be available via FormDataInputStream.Entry.getNonce(). This nonce value can be validated against the nonce of the current user via the nonce service.

Since:

6.1.0

Nested Class Summary
static class	FormDataInputStream.Entry           Extension of the MultipartInputStream.Entry that adds information about the parameter name and characterset.

 

Field Summary
static java.lang.String	CONTENT_TYPE_FORM_DATA           Deprecated. use FormDataStream.CONTENT_TYPE_FORM_DATA instead
protected static java.lang.String	COPYRIGHT           copyright statement
static java.lang.String	KEY_CHARSET           Deprecated. use FormDataStream.KEY_CHARSET instead
static java.lang.String	VALUE_FORM_DATA           Deprecated. use FormDataStream.VALUE_FORM_DATA instead

 

Fields inherited from interface com.ibm.portal.resolver.streams.FormDataStream

KEY_CSRF_TOKEN

 

Fields inherited from interface com.ibm.portal.resolver.streams.MultipartStream

CONTENT_TYPE_MULTIPART, KEY_CONTENT_DISPOSITION, KEY_FILENAME, KEY_MIME_BOUNDARY, KEY_NAME, VALUE_MULTIPART

 

Constructor Summary

FormDataInputStream()

 

Method Summary
abstract  FormDataInputStream.Entry	getNextEntry()            Reads the next multipart stream entry and positions stream at the beginning of the entry data.
static boolean	matches(ContentType ct)           Checks if the mime type is valid for a multipart/form-data input
abstract  int	read(java.io.Writer dst)           Deprecated. use FormDataInputStream.Entry.read(Writer) instead
abstract  java.lang.String	readString()           Deprecated. use FormDataInputStream.Entry.readString() instead

 

Methods inherited from class java.io.InputStream

available, close, mark, markSupported, read, read, read, reset, skip

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Methods inherited from interface com.ibm.portal.resolver.streams.MultipartStream

closeEntry

 

Methods inherited from interface java.nio.channels.Channel

close, isOpen

 

Field Detail

CONTENT_TYPE_FORM_DATA

@Deprecated
public static final java.lang.String CONTENT_TYPE_FORM_DATA

Deprecated. use FormDataStream.CONTENT_TYPE_FORM_DATA instead

mime type constants

See Also:

Constant Field Values

COPYRIGHT

protected static final java.lang.String COPYRIGHT

copyright statement

KEY_CHARSET

@Deprecated
public static final java.lang.String KEY_CHARSET

Deprecated. use FormDataStream.KEY_CHARSET instead

The special key of a form-upload parameter that the browsers set to the correct characterset

See Also:

Constant Field Values

VALUE_FORM_DATA

@Deprecated
public static final java.lang.String VALUE_FORM_DATA

Deprecated. use FormDataStream.VALUE_FORM_DATA instead

identification of a content disposition that identifies a form field

See Also:

Constant Field Values

Constructor Detail

FormDataInputStream

public FormDataInputStream()

Method Detail

matches

public static boolean matches(ContentType ct)

Checks if the mime type is valid for a multipart/form-data input

Parameters:

ct - the content type to check, not null

Returns:

true if this is a valid content type, else false

Since:

8.0

getNextEntry

public abstract FormDataInputStream.Entry getNextEntry()
                                                throws java.io.IOException

Reads the next multipart stream entry and positions stream at the beginning of the entry data. Note that FormDataInputStream.Entry instances may be recycled, the entry is only valid until the next call to getNextEntry() or MultipartStream.closeEntry().

The implementation will at least interpret the following headers automatically

• Content-Type: to implement the MultipartStream.Entry.getContentType() method
• Content-Transfer-Encoding: to select the correct decoding for the content

Specified by:

getNextEntry in class MultipartInputStream

Returns:

the form entry just read or null if there is no more entry

Throws:

java.io.IOException - if an I/O error has occurred

read

@Deprecated
public abstract int read(java.io.Writer dst)
                  throws java.io.IOException

Deprecated. use FormDataInputStream.Entry.read(Writer) instead

Reads the value of the field in the current characterset and copies it into the target writer.

Parameters:

dst - target writer, not null

Returns:

the number of characters actually copied

Throws:

java.io.IOException - - if the data could not be read or copied

readString

@Deprecated
public abstract java.lang.String readString()
                                     throws java.io.IOException

Deprecated. use FormDataInputStream.Entry.readString() instead

Reads the value of the field as a string

Returns:

the value as a string

Throws:

java.io.IOException - if an I/O error has occurred

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