http://reluk.ca:8080/v/w/Draft?p=Sys!p!sandbox&u=Frank-FlippityNet| Key | *Value | *Default | *
|---|---|---|
| cP | * *The name of the person from whose viewpoint the draft is sought. | * *Null, optional item. | * *
| p | * *The {@linkplain votorola.a.count.Poll#name() poll name}. Any slash * characters (/) may be encoded as exclamation marks (!). | * *Null, resulting in a 303 (see other) redirect that fills in the name of * the {@linkplain votorola.a.count.Poll#TEST_POLL_NAME test poll}. | * *
| u | * *The person's {@linkplain votorola.a.voter.IDPair#username() * username}. | * *None, a value is required. | * *
gwt.codesvr query parameter, then that parameter is
* replicated in the redirection. (Whether this works for dragged links depends on
* the browser; Firefox 9 does not set the "referer" (sic) header for dragged links,
* so it fails there.) {@linkplain ReferrerRelayer Relaying of stage
* state} between Crossforum Theatre pages is also supported during
* redirection.
*
* @param contextPersonName the name of the person from whose viewpoint the draft
* is sought (context person), or null if there is no context person.
*/
static String maybeRedirectToDraft( final String personName, final String pollName,
final String contextPersonName, final VOWicket app, final VRequestCycle cycle )
throws IOException
{
final VoteServer.Run vsRun = app.vsRun();
final PollwikiVS wiki = vsRun.voteServer().pollwiki();
final String coreName = wiki.positionPageName( personName, pollName );
// Query pollwiki for core position page, if any.
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
final StringBuilder qB = new StringBuilder();
qB.append( wiki.scriptURI() );
qB.append( "/api.php?format=xml&action=query&titles=" );
qB.append( UriComponent.encode( coreName, UriComponent.Type.QUERY_PARAM ));
qB.append( '&' ).append( CoreRevision.U.read_QUERY );
final URL queryURL = new URL( qB.toString() );
logger.fine( "querying pollwiki for local draft or pointer: " + queryURL );
final Spool spool = new Spool1();
CoreRevision core;
try
{
final XMLStreamReader xml = MediaWiki.requestXML( queryURL.openConnection(), spool );
core = CoreRevision.U.read( xml, wiki, ComponentPipeRevisionL.class, contextPersonName,
/*countSource*/contextPersonName == null? null: new CountSource1(vsRun) );
}
catch( final MediaWiki.NoSuchPage x ) { core = null; }
catch( final IOException x )
{
if( !(x instanceof UserInformative )) throw x;
VSession.get().error( ThrowableX.toStringExpanded( x ));
throw new RestartResponseException( new WP_Message() );
}
catch( final XMLStreamException x ) { throw new IOException( x ); }
finally{ spool.unwind(); }
// Resolve draft location (destination) and return if no actual draft exists there.
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
final WebRequest reqW = cycle.vRequest();
final HttpServletRequest reqHS = (HttpServletRequest)reqW.getContainerRequest();
final String referrerOrNull = reqHS.getHeader( "referer" ); // sic
final String codesvrLoc;
if( referrerOrNull == null ) codesvrLoc = null;
else
{
final MatchResult m = GWTX.DEV_MODE_LOCATION_PATTERN.exec( referrerOrNull );
codesvrLoc = m == null? null: m.getGroup(2);
}
final String destination = DraftRevision.U.resolveLocation( wiki, coreName, core,
codesvrLoc );
if( core == null ) return destination;
// Store state for relay. cf. s.gwt.stage.ReferrerRelayer
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
final WebResponse resW = cycle.vResponse();
final String apparentHostName;
{
// apparentHostName = vS.serverName();
//// not always fully qualified
// apparentHostName = reqHS.getLocalName();
//// Yields IP address if request is targeting root domain (http://reluk.ca/PATH,
//// Tomcat 6). And anyway, for cookie work we want the name seen by the client:
apparentHostName = reqHS.getServerName();
}
final String cookieDomain = ReferrerRelayer.cookieDomain( apparentHostName );
final DomainRelation referrerRelation = domainRelation( cookieDomain, referrerOrNull );
final DomainRelation destinationRelation = domainRelation( cookieDomain, destination );
store: if( destinationRelation == SAME ) // then use cookie
{
CookieX cookie = new CookieX( ReferrerRelayer.KEY_HREF, destination, /*toEncode*/true );
configureReferrerRelay( cookie, cookieDomain );
WebResponseX.addCookie( resW, cookie );
if( referrerRelation != SAME ) // translate state from WAP to cookie store
{
final StoreTable table = app.scopeDraft().storeTable;
final String client = StoreWAP.clientSignature( reqHS );
final StringBuilder locB = HTTPServletRequestX.getRequestURLFull( reqHS );
try
{
if( !table.delete( client, ReferrerRelayer.KEY_HREF, locB.toString() ))
{
// state apparently not stored by referrer to *this* page
break store;
}
final String pageJSON = table.get( client, ReferrerRelayer.KEY );
if( pageJSON == null ) break store; // malformed storage, nothing to translate
cookie = new CookieX( ReferrerRelayer.KEY, pageJSON, /*toEncode*/true );
configureReferrerRelay( cookie, cookieDomain );
WebResponseX.addCookie( resW, cookie );
// table.delete( client, ReferrerRelayer.KEY );
//// No gain for the pain; next overwrite/upsert actually faster if row exists.
// And deletion of the HREF has effectively neutralized it meantime.
}
catch( SQLException x ) { throw new RuntimeException( x ); }
}
}
else // destination is OTHER domain or UNKNOWN relation, so use WAP
{
final StoreTable table = app.scopeDraft().storeTable;
final String client = StoreWAP.clientSignature( reqHS );
try
{
table.put( client, ReferrerRelayer.KEY_HREF, destination );
if( referrerRelation != OTHER ) // translate state from cookie to WAP store
{
Cookie cookie = reqW.getCookie( ReferrerRelayer.KEY_HREF );
if( cookie == null ) break store;
final String originalDestination = CookieX.decodedValue( cookie.getValue() );
final StringBuilder locB = HTTPServletRequestX.getRequestURLFull( reqHS );
if( !originalDestination.contentEquals( locB )) break store;
// state apparently not stored by referrer to *this* page
configureReferrerRelay( cookie, cookieDomain );
WebResponseX.clearCookie( resW, cookie );
cookie = reqW.getCookie( ReferrerRelayer.KEY );
if( cookie == null ) break store; // malformed storage, nothing to translate
table.put( client, ReferrerRelayer.KEY,
CookieX.decodedValue(cookie.getValue()) );
configureReferrerRelay( cookie, cookieDomain );
WebResponseX.clearCookie( resW, cookie ); // lighten future requests
}
}
catch( SQLException x ) { throw new RuntimeException( x ); }
}
// Redirect to draft location.
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
throw new RedirectException( destination, 303 );
}
// ====================================================================================
/** Application scope for instances of WP_Draft.
*
* @see VOWicket#scopeDraft()
*/
public static @ThreadSafe final class ApplicationScope
{
/** Constructs an ApplicationScope.
*/
public ApplicationScope( final VOWicket app )
{
try { storeTable = new StoreTable( app ); }
catch( SQLException x ) { throw new RuntimeException( x ); }
}
private final StoreTable storeTable;
}
// ====================================================================================
/** A relation between two domains.
*/
static enum DomainRelation { OTHER, SAME, UNKNOWN }
// non-private only because 'import static' fails otherwise
//// P r i v a t e ///////////////////////////////////////////////////////////////////////
private static void configureReferrerRelay( final Cookie cookie, final String domain )
{
cookie.setDomain( domain );
cookie.setPath( ReferrerRelayer.COOKIE_PATH );
cookie.setSecure( ReferrerRelayer.COOKIE_SECURE );
}
/** Determines the domain relation between this page and another.
*
* @param cookieDomain the cookie domain for this page.
* @param otherLoc the URL of the other page, which may be null if unknown.
*/
private static DomainRelation domainRelation( final String cookieDomain, final String otherLoc )
{
final DomainRelation relation;
if( cookieDomain == null ) relation = DomainRelation.UNKNOWN;
else
{
try
{
if( otherLoc == null ) relation = DomainRelation.UNKNOWN;
else
{
final String cookieDomainOther = ReferrerRelayer.cookieDomain(
new URI(otherLoc).getHost() );
if( cookieDomain.equals( cookieDomainOther )) relation = SAME;
else relation = OTHER;
}
}
catch( URISyntaxException x ) { throw new RuntimeException( x ); }
}
return relation;
}
private static final Logger logger = LoggerX.i( WP_Draft.class );
}