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git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@18931 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
202 lines
6.3 KiB
Java
202 lines
6.3 KiB
Java
/*-----------------------------------------------------------------------------
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* Copyright 2007-2010 Alfresco Software Limited.
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*
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* This file is part of Alfresco
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*
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* Alfresco is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Alfresco is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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* Author Jon Cox <jcox@alfresco.com>
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* File UriSchemeNameMatcher.java
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*----------------------------------------------------------------------------*/
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package org.alfresco.repo.avm.util;
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import java.io.Serializable;
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import java.util.HashMap;
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import java.util.List;
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import org.alfresco.util.NameMatcher;
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/**
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* A NameMatcher that matches an incoming URL against list of schemes
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* (less formally known as "protocols"), case insensitively.
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* The formal spec for parsing URIs is RFC-3986
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* <p>
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* Perhaps someday, it might be worthwhile to create a specific
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* parser for each registered scheme-specific part, and validate
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* that; for now, we'll just be be more lax, and assume the URI
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* is alwasy scheme-qualified. This matcher will look no further
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* than the leading colon, and declare "no match" otherwise.
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* The discussion below explains why.
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* <p>
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* See: http://tools.ietf.org/html/rfc3986):
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* <pre>
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* The following regex parses URIs:
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* ^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?
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*
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* Given the following URI:
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* http://www.ics.uci.edu/pub/ietf/uri/#Related
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*
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* The captured subexpressions are:
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*
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* $1 = http:
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* $2 = http
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* $3 = //www.ics.uci.edu
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* $4 = www.ics.uci.edu
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* $5 = /pub/ietf/uri/
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* $6 = <undefined>
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* $7 = <undefined>
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* $8 = #Related
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* $9 = Related
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*
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* N0TE:
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* A URI can be non-scheme qualified because $1 is optional. Therefore,
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* the following are all exaples of valid non-scheme qualified URIS:
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*
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* ""
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* "moo@cow.com"
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* "moo@cow.com?wow"
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* "moo@cow.com?wow#zow"
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* "moo@cow.com#zow"
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* "/"
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* "/moo/cow"
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* "/moo/cow?wow"
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* "/moo/cow?wow#zow"
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* "/moo/cow#zow"
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* "//moo/cow"
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* "//moo.com/cow"
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* "//moo.com/cow/"
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* "//moo.com/cow?wow"
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* "//moo.com/cow?wow#zow"
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* "//moo.com/cow#zow"
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* "//moo.com:8080/cow"
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* "//moo.com:/cow"
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* "//moo.com:8080/cow?wow"
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* "//moo.com:8080/cow?wow#zow"
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* "//moo.com:8080/cow#zow"
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* "///moo/cow"
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* "///moo/cow?wow"
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* "///moo/cow?wow#zow"
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* "///moo/cow#zow"
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*
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* And so forth...
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*
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* <pre>
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*
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* Thus the business end of things as far as scheme matching is: $2,
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* Most schemes will have a $3 that starts with '//', but not all.
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* Specificially, the following have no "network path '//' segment,
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* or aren't required to (source: http://en.wikipedia.org/wiki/URI_scheme):
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* <pre>
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*
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* cid data dns fax go h323 iax2 mailto mid news pres sip
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* sips tel urn xmpp about aim callto feed magnet msnim
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* psyc skype sms stream xfire ymsgr
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*
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* </pre>
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*
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* Visually the parts are as follows:
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* <pre>
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*
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* foo://example.com:10042/over/there?name=ferret#nose
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* \_/ \_______________/\_________/ \_________/ \__/
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* | | | | |
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* scheme authority path query fragment
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* | _____________________|__
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* / \ / \
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* urn:example:animal:ferret:nose
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*
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* </pre>
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*
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* This is useful for classifying URLs for things like whether or not
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* they're supported by an application.
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*
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* For example, the LinkValidationService supports http, and https,
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* is willing to ignore certain well-formed URLs, but treats URLs
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* will unknown and unsupported protocols as broken. Concretely,
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* we'd like to avoid treating something like the following one
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* as being non-broken even though you can't apply GET or HEAD
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* to it.
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*
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* <pre>
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* <a href="mailto:alice@example.com">Email</a>
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* </pre>
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*
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* As of June 2007,IANA had over 70 registered and provisional protocols
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* listed at http://www.iana.org/assignments/uri-schemes.html but sometimes
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* people create their own too (e.g.: cvs). Here's the official list:
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* <pre>
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*
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* aaa aaas acap afs cap cid crid data dav dict dns dtn fax file
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* ftp go gopher h323 http https iax2 icap im imap info ipp iris
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* iris.beep iris.lwz iris.xpc iris.xpcs ldap mailserver mailto
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* mid modem msrp msrps mtqp mupdate news nfs nntp opaquelocktoken
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* pop pres prospero rtsp service shttp sip sips snmp soap.beep
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* soap.beeps tag tel telnet tftp thismessage tip tn3270 tv urn
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* vemmi wais xmlrpc.beep xmlrpc.beeps xmpp z39.50r z39.50s
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* </pre>
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*
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*/
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public class UriSchemeNameMatcher implements NameMatcher, Serializable
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{
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/**
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* The extensions to match.
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*/
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HashMap<String,String> scheme_;
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/**
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* Default constructor.
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*/
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public UriSchemeNameMatcher()
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{
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scheme_ = new HashMap<String,String>();
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}
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/**
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* Set the protocols case insensitively (cannonicalized to lower-case).
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*
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* @param protocols
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*/
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public void setExtensions(List<String> protocols)
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{
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for (String protocol : protocols)
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{
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scheme_.put( protocol.toLowerCase(), null );
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}
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}
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/**
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* Returns true if the URL's protocol is in the of
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* being matched. Everything up to but not including
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* the intial colon is
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*/
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public boolean matches(String uri)
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{
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if ( uri == null ) { return false; }
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int colon_index = uri.indexOf(':');
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if ( colon_index >= 0)
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{
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String proto =
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uri.substring(0, colon_index).toLowerCase();
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return scheme_.containsKey( proto );
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}
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return false;
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}
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}
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