org.htmlparser.http
Class ConnectionManager

java.lang.Object
  org.htmlparser.http.ConnectionManager

public class ConnectionManager
extends Object

Handles proxies, password protected URLs and request properties including cookies.

Field Summary

protected Hashtable	mCookieJar Cookie storage, a hashtable (by site or host) of vectors of Cookies.
protected static Hashtable	mDefaultRequestProperties Default Request header fields.
protected static SimpleDateFormat	mFormat Cookie expiry date format for parsing.
protected ConnectionMonitor	mMonitor The object to be notified prior to and after each connection.
protected String	mPassword The user password for accessing the URL.
protected String	mProxyHost The proxy server name.
protected String	mProxyPassword The proxy user password.
protected int	mProxyPort The proxy port number.
protected String	mProxyUser The proxy username name.
protected boolean	mRedirectionProcessingEnabled Flag determining if redirection processing is being handled manually.
protected Hashtable	mRequestProperties Request header fields.
protected String	mUser The username name for accessing the URL.

Constructor Summary

ConnectionManager()
Create a connection manager.

ConnectionManager(Hashtable properties)
Create a connection manager with the given connection properties.

Method Summary

void	addCookies(URLConnection connection) Generate a HTTP cookie header value string from the cookie jar.
protected Vector	addCookies(Vector cookies, String path, Vector list) Add qualified cookies from cookies into list.
static String	encode(byte[] array) Encodes a byte array into BASE64 in accordance with RFC 2045.
String	fixSpaces(String url) Turn spaces into %20.
protected String	generateCookieProperty(Vector cookies) Creates the cookie request property value from the list of valid cookies for the domain.
boolean	getCookieProcessingEnabled() Predicate to determine if cookie processing is currently enabled.
static Hashtable	getDefaultRequestProperties() Get the current default request header properties.
protected String	getDomain(String host) Get the domain from a host.
protected String	getLocation(HttpURLConnection http) Get the Location field if any.
ConnectionMonitor	getMonitor() Get the monitoring object, if any.
String	getPassword() Get the URL users's password.
String	getProxyHost() Get the proxy host name, if any.
String	getProxyPassword() Set the proxy user's password.
int	getProxyPort() Get the proxy port number.
String	getProxyUser() Get the user name for proxy authorization, if any.
boolean	getRedirectionProcessingEnabled() Predicate to determine if url redirection processing is currently enabled.
Hashtable	getRequestProperties() Get the current request header properties.
String	getUser() Get the user name to access the URL.
URLConnection	openConnection(String string) Opens a connection based on a given string.
URLConnection	openConnection(URL url) Opens a connection using the given url.
void	parseCookies(URLConnection connection) Check for cookie and parse into cookie jar.
protected void	saveCookies(Vector list, URLConnection connection) Save the cookies received in the response header.
void	setCookie(Cookie cookie, String domain) Adds a cookie to the cookie jar.
void	setCookieProcessingEnabled(boolean enable) Enables and disabled cookie processing.
static void	setDefaultRequestProperties(Hashtable properties) Set the default request header properties.
void	setMonitor(ConnectionMonitor monitor) Set the monitoring object.
void	setPassword(String password) Set the URL users's password.
void	setProxyHost(String host) Set the proxy host to use.
void	setProxyPassword(String password) Get the proxy user's password.
void	setProxyPort(int port) Set the proxy port number.
void	setProxyUser(String user) Set the user name for proxy authorization.
void	setRedirectionProcessingEnabled(boolean enabled) Enables or disables manual redirection handling.
void	setRequestProperties(Hashtable properties) Set the current request properties.
void	setUser(String user) Set the user name to access the URL.

Methods inherited from class java.lang.Object

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

Field Detail

mDefaultRequestProperties

protected static Hashtable mDefaultRequestProperties

Default Request header fields. So far this is just "User-Agent" and "Accept-Encoding".

mRequestProperties

protected Hashtable mRequestProperties

Request header fields.

mProxyHost

protected String mProxyHost

The proxy server name.

mProxyPort

protected int mProxyPort

The proxy port number.

mProxyUser

protected String mProxyUser

The proxy username name.

mProxyPassword

protected String mProxyPassword

The proxy user password.

mUser

protected String mUser

The username name for accessing the URL.

mPassword

protected String mPassword

The user password for accessing the URL.

mCookieJar

protected Hashtable mCookieJar

Cookie storage, a hashtable (by site or host) of vectors of Cookies. This will be null if cookie processing is disabled (default).

mMonitor

protected ConnectionMonitor mMonitor

The object to be notified prior to and after each connection.

mRedirectionProcessingEnabled

protected boolean mRedirectionProcessingEnabled

Flag determining if redirection processing is being handled manually.

mFormat

protected static SimpleDateFormat mFormat

Cookie expiry date format for parsing.

Constructor Detail

ConnectionManager

public ConnectionManager()

Create a connection manager.

ConnectionManager

public ConnectionManager(Hashtable properties)

Create a connection manager with the given connection properties.

Parameters:

properties - Name/value pairs to be added to the HTTP request.

Method Detail

getDefaultRequestProperties

public static Hashtable getDefaultRequestProperties()

Get the current default request header properties. A String-to-String map of header keys and values. These fields are set by the parser when creating a connection.

Returns:

The default set of request header properties that will currently be used.

See Also:

mDefaultRequestProperties, setRequestProperties(java.util.Hashtable)

setDefaultRequestProperties

public static void setDefaultRequestProperties(Hashtable properties)

Set the default request header properties. A String-to-String map of header keys and values. These fields are set by the parser when creating a connection. Some of these can be set directly on a URLConnection, i.e. If-Modified-Since is set with setIfModifiedSince(long), but since the parser transparently opens the connection on behalf of the developer, these properties are not available before the connection is fetched. Setting these request header fields affects all subsequent connections opened by the parser. For more direct control create a URLConnection massage it the way you want and then set it on the parser.

From RFC 2616 Hypertext Transfer Protocol -- HTTP/1.1:

 5.3 Request Header Fields

    The request-header fields allow the client to pass additional
    information about the request, and about the client itself, to the
    server. These fields act as request modifiers, with semantics
    equivalent to the parameters on a programming language method
    invocation.

        request-header = Accept                   ; Section 14.1
                       | Accept-Charset           ; Section 14.2
                       | Accept-Encoding          ; Section 14.3
                       | Accept-Language          ; Section 14.4
                       | Authorization            ; Section 14.8
                       | Expect                   ; Section 14.20
                       | From                     ; Section 14.22
                       | Host                     ; Section 14.23
                       | If-Match                 ; Section 14.24
                       | If-Modified-Since        ; Section 14.25
                       | If-None-Match            ; Section 14.26
                       | If-Range                 ; Section 14.27
                       | If-Unmodified-Since      ; Section 14.28
                       | Max-Forwards             ; Section 14.31
                       | Proxy-Authorization      ; Section 14.34
                       | Range                    ; Section 14.35
                       | Referer                  ; Section 14.36
                       | TE                       ; Section 14.39
                       | User-Agent               ; Section 14.43

    Request-header field names can be extended reliably only in
    combination with a change in the protocol version. However, new or
    experimental header fields MAY be given the semantics of request-
    header fields if all parties in the communication recognize them to
    be request-header fields. Unrecognized header fields are treated as
    entity-header fields.
 

Parameters:

properties - The new set of default request header properties to use. This affects all subsequently created connections.

See Also:

mDefaultRequestProperties, setRequestProperties(java.util.Hashtable)

getRequestProperties

public Hashtable getRequestProperties()

Get the current request header properties. A String-to-String map of header keys and values, excluding proxy items, cookies and URL authorization.

Returns:

The request header properties for this connection manager.

setRequestProperties

public void setRequestProperties(Hashtable properties)

Set the current request properties. Replaces the current set of fixed request properties with the given set. This does not replace the Proxy-Authorization property which is constructed from the values of setProxyUser(java.lang.String) and setProxyPassword(java.lang.String) values or the Authorization property which is constructed from the setUser(java.lang.String) and setPassword(java.lang.String) values. Nor does it replace the Cookie property which is constructed from the current cookie jar.

Parameters:

properties - The new fixed properties.

getProxyHost

public String getProxyHost()

Get the proxy host name, if any.

Returns:

Returns the proxy host.

setProxyHost

public void setProxyHost(String host)

Set the proxy host to use.

Parameters:

host - The host to use for proxy access. Note: You must also set the proxy port.

getProxyPort

public int getProxyPort()

Get the proxy port number.

Returns:

Returns the proxy port.

setProxyPort

public void setProxyPort(int port)

Set the proxy port number.

Parameters:

port - The proxy port. Note: You must also set the proxy host.

getProxyUser

public String getProxyUser()

Get the user name for proxy authorization, if any.

Returns:

Returns the proxy user, or null if no proxy authorization is required.

setProxyUser

public void setProxyUser(String user)

Set the user name for proxy authorization.

Parameters:

user - The proxy user name. Note: You must also set the proxy password.

getProxyPassword

public String getProxyPassword()

Set the proxy user's password.

Returns:

Returns the proxy password.

setProxyPassword

public void setProxyPassword(String password)

Get the proxy user's password.

Parameters:

password - The password for the proxy user. Note: You must also set the proxy user.

getUser

public String getUser()

Get the user name to access the URL.

Returns:

Returns the username that will be used to access the URL, or null if no authorization is required.

setUser

public void setUser(String user)

Set the user name to access the URL.

Parameters:

user - The user name for accessing the URL. Note: You must also set the password.

getPassword

public String getPassword()

Get the URL users's password.

Returns:

Returns the URL password.

setPassword

public void setPassword(String password)

Set the URL users's password.

Parameters:

password - The password for the URL.

getCookieProcessingEnabled

public boolean getCookieProcessingEnabled()

Predicate to determine if cookie processing is currently enabled.

Returns:

true if cookies are being processed.

setCookieProcessingEnabled

public void setCookieProcessingEnabled(boolean enable)

Enables and disabled cookie processing.

Parameters:

enable - if true cookie processing will occur, else cookie processing will be turned off.

setCookie

public void setCookie(Cookie cookie,
                      String domain)

Adds a cookie to the cookie jar.

Parameters:

cookie - The cookie to add.

domain - The domain to use in case the cookie has no domain attribute.

getMonitor

public ConnectionMonitor getMonitor()

Get the monitoring object, if any.

Returns:

Returns the monitor, or null if none has been assigned.

setMonitor

public void setMonitor(ConnectionMonitor monitor)

Set the monitoring object.

Parameters:

monitor - The monitor to set.

getRedirectionProcessingEnabled

public boolean getRedirectionProcessingEnabled()

Predicate to determine if url redirection processing is currently enabled.

Returns:

true if redirection is being processed manually.

See Also:

setRedirectionProcessingEnabled(boolean)

setRedirectionProcessingEnabled

public void setRedirectionProcessingEnabled(boolean enabled)

Enables or disables manual redirection handling. Normally the HttpURLConnection follows redirections (HTTP response code 3xx) automatically if the followRedirects property is true. With this flag set the ConnectionMonitor performs the redirection processing; The advantage being that cookies (if enabled) are passed in subsequent requests.

Parameters:

enabled - The new state of the redirectionProcessingEnabled property.

getLocation

protected String getLocation(HttpURLConnection http)

Get the Location field if any.

Parameters:

http - The connection to get the location from.

openConnection

public URLConnection openConnection(URL url)
                             throws ParserException

Opens a connection using the given url.

Parameters:

url - The url to open.

Returns:

The connection.

Throws:

ParserException - if an i/o exception occurs accessing the url.

encode

public static final String encode(byte[] array)

Encodes a byte array into BASE64 in accordance with RFC 2045.

Parameters:

array - The bytes to convert.

Returns:

A BASE64 encoded string.

fixSpaces

public String fixSpaces(String url)

Turn spaces into %20. ToDo: make this more generic (see RFE #1010593 provide URL encoding/decoding utilities).

Parameters:

url - The url containing spaces.

Returns:

The URL with spaces as %20 sequences.

openConnection

public URLConnection openConnection(String string)
                             throws ParserException

Opens a connection based on a given string. The string is either a file, in which case file://localhost is prepended to a canonical path derived from the string, or a url that begins with one of the known protocol strings, i.e. http://. Embedded spaces are silently converted to %20 sequences.

Parameters:

string - The name of a file or a url.

Returns:

The connection.

Throws:

ParserException - if the string is not a valid url or file.

addCookies

public void addCookies(URLConnection connection)

Generate a HTTP cookie header value string from the cookie jar.

   The syntax for the header is:

    cookie          =       "Cookie:" cookie-version
                            1*((";" | ",") cookie-value)
    cookie-value    =       NAME "=" VALUE [";" path] [";" domain]
    cookie-version  =       "$Version" "=" value
    NAME            =       attr
    VALUE           =       value
    path            =       "$Path" "=" value
    domain          =       "$Domain" "=" value

 

Parameters:

connection - The connection being accessed.

See Also:

RFC 2109, RFC 2396

addCookies

protected Vector addCookies(Vector cookies,
                            String path,
                            Vector list)

Add qualified cookies from cookies into list.

Parameters:

cookies - The list of cookies to check (may be null).

path - The path being accessed.

list - The list of qualified cookies.

Returns:

The list of qualified cookies.

getDomain

protected String getDomain(String host)

Get the domain from a host.

Parameters:

host - The supposed host name.

Returns:

The domain (with the leading dot), or null if the domain cannot be determined.

generateCookieProperty

protected String generateCookieProperty(Vector cookies)

Creates the cookie request property value from the list of valid cookies for the domain.

Parameters:

cookies - The list of valid cookies to be encoded in the request.

Returns:

A string suitable for inclusion as the value of the "Cookie:" request property.

parseCookies

public void parseCookies(URLConnection connection)

Check for cookie and parse into cookie jar.

Parameters:

connection - The connection to extract cookie information from.

saveCookies

protected void saveCookies(Vector list,
                           URLConnection connection)

Save the cookies received in the response header.

Parameters:

list - The list of cookies extracted from the response header.

connection - The connection (used when a cookie has no domain).