| // Copyright (c) 2011, Mike Samuel |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions |
| // are met: |
| // |
| // Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // Redistributions in binary form must reproduce the above copyright |
| // notice, this list of conditions and the following disclaimer in the |
| // documentation and/or other materials provided with the distribution. |
| // Neither the name of the OWASP nor the names of its contributors may |
| // be used to endorse or promote products derived from this software |
| // without specific prior written permission. |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| // FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| // COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| // BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| // LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| // LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
| // ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| // POSSIBILITY OF SUCH DAMAGE. |
| |
| package org.owasp.html; |
| |
| /** |
| * A URL checker optimized to avoid object allocation for the common case: |
| * {@code http}, {@code https}, {@code mailto}. |
| */ |
| @TCB |
| final class StandardUrlAttributePolicy implements AttributePolicy { |
| |
| static final StandardUrlAttributePolicy INSTANCE |
| = new StandardUrlAttributePolicy(); |
| |
| private StandardUrlAttributePolicy() { /* singleton */ } |
| |
| public String apply(String elementName, String attributeName, String s) { |
| protocol_loop: |
| for (int i = 0, n = s.length(); i < n; ++i) { |
| switch (s.charAt(i)) { |
| case '/': case '#': case '?': // No protocol. |
| break protocol_loop; |
| case ':': |
| switch (i) { |
| case 4: |
| if (!Strings.regionMatchesIgnoreCase("http", 0, s, 0, 4)) { |
| return null; |
| } |
| break; |
| case 5: |
| if (!Strings.regionMatchesIgnoreCase("https", 0, s, 0, 5)) { |
| return null; |
| } |
| break; |
| case 6: |
| if (!Strings.regionMatchesIgnoreCase("mailto", 0, s, 0, 6)) { |
| return null; |
| } |
| break; |
| default: return null; |
| } |
| break protocol_loop; |
| } |
| } |
| return FilterUrlByProtocolAttributePolicy.normalizeUri(s); |
| } |
| |
| } |