├── .gitignore ├── src └── main │ ├── resources │ └── group-provider.properties │ └── java │ └── io │ └── asaha │ └── trino │ └── groupprovider │ └── ldap │ ├── LdapGroupProviderPlugin.java │ ├── LdapGroupProviderFactory.java │ └── LdapGroupProvider.java ├── README.md ├── pom.xml └── LICENSE.txt /.gitignore: -------------------------------------------------------------------------------- 1 | target 2 | .idea 3 | *.iml -------------------------------------------------------------------------------- /src/main/resources/group-provider.properties: -------------------------------------------------------------------------------- 1 | group-provider.name=ldap-ad 2 | ldap.url=ldaps://ad.company.com:636 3 | ldap.admin-user=admin@ad.company.com 4 | ldap.admin-password=admin-password 5 | ldap.user-base-dn=OU=Sites,DC=ad,DC=company,DC=com 6 | ldap.user-base-dn-secondary=OU=Applications,DC=ad,DC=company,DC=com 7 | ldap.user-search-filter=(&(objectClass=person)(sAMAccountName=${USER})) 8 | ldap.group-filter=Managed Groups 9 | ldap.cache-ttl=1h 10 | ldap.max-retry-count=5 11 | ldap.retry-interval=2s 12 | -------------------------------------------------------------------------------- /src/main/java/io/asaha/trino/groupprovider/ldap/LdapGroupProviderPlugin.java: -------------------------------------------------------------------------------- 1 | package io.asaha.trino.groupprovider.ldap; 2 | 3 | import io.trino.spi.Plugin; 4 | import io.trino.spi.security.GroupProviderFactory; 5 | 6 | import java.util.Collections; 7 | 8 | public final class LdapGroupProviderPlugin implements Plugin { 9 | 10 | @Override 11 | public Iterable getGroupProviderFactories() { 12 | return Collections.singletonList(new LdapGroupProviderFactory()); 13 | } 14 | } 15 | -------------------------------------------------------------------------------- /src/main/java/io/asaha/trino/groupprovider/ldap/LdapGroupProviderFactory.java: -------------------------------------------------------------------------------- 1 | package io.asaha.trino.groupprovider.ldap; 2 | 3 | import io.trino.spi.security.GroupProvider; 4 | import io.trino.spi.security.GroupProviderFactory; 5 | 6 | import java.util.Map; 7 | 8 | public class LdapGroupProviderFactory implements GroupProviderFactory { 9 | 10 | @Override 11 | public String getName() { 12 | return "ldap-ad"; 13 | } 14 | 15 | @Override 16 | public GroupProvider create(Map config) { 17 | if (config.isEmpty()) { 18 | throw new IllegalArgumentException("this group provider requires configuration properties"); 19 | } 20 | return new LdapGroupProvider(config); 21 | } 22 | } 23 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Overview 2 | 3 | Trino Group Provider LDAP is a Trino (formerly Presto SQL) plugin to map user names to groups using an LDAP server 4 | 5 | Its an implementation of Trino Group Provider, which will map Corporate/Local LDAP groups with AD users. 6 | The groups can be further used for system and catalog authorization and RBAC implementation based on AD groups. 7 | 8 | 9 | ## Build 10 | 11 | The artifacts are also present in the [Release](https://github.com/arghya18/trino-group-provider-ldap-ad/releases) of this project, incase you do not want to build this project. 12 | 13 | ``` 14 | mvn clean package 15 | ``` 16 | 17 | 18 | ## Deploy 19 | 20 | ### Copy artifacts 21 | 22 | Copy the following artifacts from build or from release to the Trino plugin folder (`/plugin/ldap-ad/`) 23 | 24 | ``` 25 | target/trino-group-provider-ldap-ad-1.0/*.jar 26 | ``` 27 | 28 | ### Prepare configuration file 29 | 30 | Create `/group-provider.properties` with the following required parameters, e.g.: 31 | 32 | ``` 33 | group-provider.name=ldap-ad 34 | ldap.url=ldaps://ad.company.com:636 35 | ldap.admin-user=admin@ad.company.com 36 | ldap.admin-password=admin-password 37 | ldap.user-base-dn=OU=Sites,DC=ad,DC=company,DC=com 38 | ldap.user-search-filter=(&(objectClass=person)(sAMAccountName=${USER})) 39 | ``` 40 | 41 | #### Optional Parameters 42 | 43 | | Configuration | Default | Description | 44 | |--------------------------------|-----------------------|---------------------------------------------| 45 | | `ldap.user-base-dn-secondary` | **ldap.user-base-dn** | Secondary base dn. | 46 | | `ldap.group-filter` | **ou** | Group Filter. | 47 | | `ldap.cache-ttl` | **1h** | Cache ttl for LDAP groups. | 48 | | `ldap.max-retry-count` | **5** | Retry count. | 49 | | `ldap.retry-interval` | **2s** | Retry interval. | 50 | | `ldap.ssl.keystore.path` | **null** | The path to the PEM or JKS keystore file. | 51 | | `ldap.ssl.keystore.password` | **null** | Password for the key store. | 52 | | `ldap.ssl.truststore.path` | **null** | The path to the PEM or JKS truststore file. | 53 | | `ldap.ssl.truststore.password` | **null** | Password for the truststore. | 54 | 55 | 56 | ### Import LDAP server SSL certificate 57 | 58 | Import SSL certificates in Trino coordinator required to connect to LDAP server using keytool, below is one example 59 | 60 | ``` 61 | sudo keytool -import -alias ldap_cert -keystore $JAVA_HOME/lib/security/cacerts -file .pem -storepass changeit -noprompt 62 | ``` 63 | 64 | If you can't or don't want to import SSL certificates in Trino cacerts keystore, you can use `ldap.ssl.*` parameters to specify -------------------------------------------------------------------------------- /pom.xml: -------------------------------------------------------------------------------- 1 | 2 | 5 | 4.0.0 6 | 7 | io.asaha 8 | trino-group-provider-ldap-ad 9 | 1.0 10 | trino-plugin 11 | 12 | 13 | 423 14 | 11 15 | 11 16 | 17 | 18 | 19 | 20 | com.google.guava 21 | guava 22 | 30.1-jre 23 | 24 | 25 | io.airlift 26 | log 27 | 208 28 | 29 | 30 | io.airlift 31 | units 32 | 1.6 33 | 34 | 35 | io.airlift 36 | security 37 | 237 38 | 39 | 40 | 41 | 42 | io.trino 43 | trino-spi 44 | ${trino.version} 45 | provided 46 | 47 | 48 | 49 | io.trino 50 | trino-plugin-toolkit 51 | ${trino.version} 52 | 53 | 54 | com.fasterxml.jackson.core 55 | jackson-annotations 56 | 57 | 58 | io.airlift 59 | slice 60 | 61 | 62 | io.opentelemetry 63 | opentelemetry-api 64 | 65 | 66 | io.opentelemetry 67 | opentelemetry-context 68 | 69 | 70 | 71 | 72 | 73 | 74 | io.airlift 75 | testing 76 | 0.197 77 | test 78 | 79 | 80 | org.testng 81 | testng 82 | 7.7.0 83 | test 84 | 85 | 86 | 87 | 88 | 89 | 90 | io.trino 91 | trino-maven-plugin 92 | 12 93 | true 94 | 95 | 96 | 97 | 98 | 99 | -------------------------------------------------------------------------------- /src/main/java/io/asaha/trino/groupprovider/ldap/LdapGroupProvider.java: -------------------------------------------------------------------------------- 1 | package io.asaha.trino.groupprovider.ldap; 2 | 3 | import com.google.common.cache.CacheBuilder; 4 | import com.google.common.cache.CacheLoader; 5 | import com.google.common.cache.LoadingCache; 6 | import com.google.common.collect.ImmutableMap; 7 | import io.trino.plugin.base.ssl.SslUtils; 8 | import io.trino.spi.classloader.ThreadContextClassLoader; 9 | import io.trino.spi.security.GroupProvider; 10 | import io.trino.plugin.base.ldap.*; 11 | import javax.naming.AuthenticationException; 12 | import javax.naming.NamingEnumeration; 13 | import javax.naming.NamingException; 14 | import javax.naming.directory.*; 15 | import javax.net.ssl.SSLContext; 16 | import java.util.*; 17 | import java.util.concurrent.TimeUnit; 18 | import java.security.GeneralSecurityException; 19 | import io.airlift.log.Logger; 20 | import io.airlift.units.Duration; 21 | 22 | import java.io.File; 23 | import java.io.IOException; 24 | 25 | import static javax.naming.Context.*; 26 | 27 | public class LdapGroupProvider implements GroupProvider { 28 | 29 | private static final Logger log = Logger.get(LdapGroupProvider.class); 30 | private final String ldapAdminUser; 31 | private final String ldapAdminPassword; 32 | private final Optional sslContext; 33 | private final String userBaseDistinguishedName; 34 | private final String userBaseDistinguishedNameSecondary; 35 | private final String userSearchFilter; 36 | private final String groupFilter; 37 | private final String maxRetryCount; 38 | private final String retryInterval; 39 | private final String keystorePath; 40 | private final String keystorePassword; 41 | private final String truststorePath; 42 | private final String truststorePassword; 43 | private final Map basicEnvironment; 44 | private final LoadingCache> groupListCache; 45 | private boolean isIgnoreReferrals = false; 46 | 47 | LdapGroupProvider(Map config){ 48 | String ldapUrl = config.get("ldap.url"); 49 | this.ldapAdminUser = config.get("ldap.admin-user"); 50 | if (this.ldapAdminUser == null) { 51 | log.error("You must specify option 'ldap.admin-user'"); 52 | throw new IllegalArgumentException("You must specify option 'ldap.admin-user'"); 53 | } 54 | this.ldapAdminPassword = config.get("ldap.admin-password"); 55 | if (this.ldapAdminPassword == null) { 56 | log.error("You must specify option 'ldap.admin-password'"); 57 | throw new IllegalArgumentException("You must specify option 'ldap.admin-password'"); 58 | } 59 | this.userBaseDistinguishedName = config.get("ldap.user-base-dn"); 60 | if (this.userBaseDistinguishedName == null) { 61 | log.error("You must specify option 'ldap.user-base-dn'"); 62 | throw new IllegalArgumentException("You must specify option 'ldap.user-base-dn'"); 63 | } 64 | this.userBaseDistinguishedNameSecondary = config.getOrDefault("ldap.user-base-dn-secondary", userBaseDistinguishedName); 65 | this.userSearchFilter = config.get("ldap.user-search-filter"); 66 | if (this.userSearchFilter == null) { 67 | log.error("You must specify option 'ldap.user-search-filter'"); 68 | throw new IllegalArgumentException("You must specify option 'ldap.user-search-filter'"); 69 | } 70 | this.groupFilter = config.getOrDefault("ldap.group-filter","ou"); 71 | String ldapCacheTtl = config.getOrDefault("ldap.cache-ttl","1h"); 72 | this.maxRetryCount = config.getOrDefault("ldap.max-retry-count", "5"); 73 | this.retryInterval = config.getOrDefault("ldap.retry-interval","2s"); 74 | this.keystorePath = config.getOrDefault("ldap.ssl.keystore.path",null); 75 | this.keystorePassword = config.getOrDefault("ldap.ssl.keystore.password",null); 76 | this.truststorePath = config.getOrDefault("ldap.ssl.truststore.path",null); 77 | this.truststorePassword = config.getOrDefault("ldap.ssl.truststore.password",null); 78 | 79 | 80 | File keystoreFile; 81 | if(keystorePath != null){ 82 | keystoreFile = new File(keystorePath); 83 | } else { 84 | keystoreFile = null; 85 | } 86 | File truststoreFile; 87 | if(truststorePath != null){ 88 | truststoreFile = new File(truststorePath); 89 | } else { 90 | truststoreFile = null; 91 | } 92 | 93 | this.sslContext = createSslContext( 94 | Optional.ofNullable(keystoreFile), 95 | Optional.ofNullable(keystorePassword), 96 | Optional.ofNullable(truststoreFile), 97 | Optional.ofNullable(truststorePassword) 98 | ); 99 | 100 | this.basicEnvironment = ImmutableMap.builder() 101 | .put(INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory") 102 | .put(PROVIDER_URL, ldapUrl) 103 | .put(REFERRAL, isIgnoreReferrals ? "ignore" : "follow") 104 | .build(); 105 | 106 | this.groupListCache = CacheBuilder.newBuilder() 107 | .expireAfterWrite(Duration.valueOf(ldapCacheTtl).toMillis(),TimeUnit.MILLISECONDS) 108 | .maximumSize(1000) 109 | .build(CacheLoader.from(this::getLdapGroups)); 110 | } 111 | 112 | private static String replaceUser(String pattern, String user) 113 | { 114 | return pattern.replace("${USER}", user); 115 | } 116 | 117 | private static Optional createSslContext(Optional keyStorePath, Optional keyStorePassword, Optional trustStorePath, Optional trustStorePassword) { 118 | if (keyStorePath.isEmpty() && trustStorePath.isEmpty()) { 119 | return Optional.empty(); 120 | } else { 121 | try { 122 | return Optional.of(SslUtils.createSSLContext(keyStorePath, keyStorePassword, trustStorePath, trustStorePassword)); 123 | } catch (IOException | GeneralSecurityException var5) { 124 | throw new RuntimeException(var5); 125 | } 126 | } 127 | } 128 | 129 | private Map createEnvironment(String userDistinguishedName, String password) 130 | { 131 | ImmutableMap.Builder environment = ImmutableMap.builder() 132 | .putAll(basicEnvironment) 133 | .put(SECURITY_AUTHENTICATION, "simple") 134 | .put(SECURITY_PRINCIPAL, userDistinguishedName) 135 | .put(SECURITY_CREDENTIALS, password); 136 | 137 | sslContext.ifPresent(context -> { 138 | LdapSslSocketFactory.setSslContextForCurrentThread(context); 139 | 140 | // see https://docs.oracle.com/javase/jndi/tutorial/ldap/security/ssl.html 141 | environment.put("java.naming.ldap.factory.socket", LdapSslSocketFactory.class.getName()); 142 | }); 143 | return environment.build(); 144 | } 145 | 146 | private DirContext createUserDirContext(String userDistinguishedName, String password, int retryCount) 147 | throws NamingException 148 | { 149 | Map environment = createEnvironment(userDistinguishedName, password); 150 | DirContext dirContext; 151 | 152 | try { 153 | //return new InitialDirContext(new Hashtable<>(environment)); 154 | dirContext = new InitialDirContext(new Hashtable<>(environment)); 155 | // log.info("Password validation successful for user DN [%s]", userDistinguishedName); 156 | } 157 | catch (AuthenticationException e) { 158 | log.error("Password validation failed for user DN [%s]: %s", userDistinguishedName, e.getMessage()); 159 | throw new AuthenticationException("Invalid credentials"); 160 | } 161 | catch (NamingException ne) { 162 | log.error(ne, "NamingException for attempt: [%s]", retryCount); 163 | if (retryCount >= Integer.parseInt(maxRetryCount)) { 164 | throw ne; 165 | } 166 | try { 167 | Thread.sleep(Duration.valueOf(retryInterval).toMillis()); 168 | } catch (InterruptedException ex) { 169 | ex.printStackTrace(); 170 | } 171 | dirContext = createUserDirContext(userDistinguishedName, password, ++retryCount); 172 | } 173 | 174 | return dirContext; 175 | } 176 | 177 | private NamingEnumeration searchGroupMembership(String user, String userBaseDN, DirContext context) 178 | throws NamingException 179 | { 180 | SearchControls searchControls = new SearchControls(); 181 | String[] attrIDs = {"memberOf"}; 182 | searchControls.setReturningAttributes(attrIDs); 183 | searchControls.setSearchScope(SearchControls.SUBTREE_SCOPE); 184 | return context.search(userBaseDN, replaceUser(userSearchFilter, user), searchControls); 185 | } 186 | 187 | private Set getLdapGroups(String user) { 188 | try { 189 | DirContext dirContext = createUserDirContext(ldapAdminUser, ldapAdminPassword, 0); 190 | Set groupSet = new HashSet(); 191 | try{ 192 | NamingEnumeration search = searchGroupMembership(user, userBaseDistinguishedName, dirContext); 193 | try { 194 | if (!search.hasMore()) { 195 | log.debug("User [%s] not found in primary base dn", user); 196 | search.close(); 197 | search = searchGroupMembership(user, userBaseDistinguishedNameSecondary, dirContext); 198 | if (!search.hasMore()) { 199 | log.warn("User [%s] not found in secondary base dn", user); 200 | return Collections.emptySet(); 201 | } 202 | log.debug("User [%s] found in secondary base dn", user); 203 | } 204 | //String userDistinguishedName = search.next().getAttributes(); 205 | Attribute groupAttributes = search.next().getAttributes().get("memberOf"); 206 | if (groupAttributes == null) { 207 | log.debug("User [%s] is not member of any group", user); 208 | return Collections.emptySet(); 209 | } 210 | 211 | log.debug("User: [%s], Group Details: [%s]", user, groupAttributes.toString()); 212 | for (int ix= 0; ix < groupAttributes.size(); ix++){ 213 | String group = groupAttributes.get(ix).toString(); 214 | if (group.toLowerCase().contains(groupFilter.toLowerCase())){ 215 | groupSet.add(group.split("(?i),ou=")[0].split("=")[1]); 216 | } 217 | } 218 | } 219 | finally { 220 | search.close(); 221 | } 222 | } 223 | finally { 224 | dirContext.close(); 225 | } 226 | log.info("User: [%s], LDAP Groups: %s", user, groupSet.toString()); 227 | return groupSet; 228 | 229 | } catch (NamingException e) { 230 | log.error(e, "NamingException for User: [%s]", user); 231 | return Collections.emptySet(); 232 | } 233 | } 234 | 235 | @Override 236 | public Set getGroups(String user) { 237 | try (ThreadContextClassLoader ignored = new ThreadContextClassLoader(getClass().getClassLoader())) { 238 | Set groups = groupListCache.getUnchecked(user); 239 | log.debug("User: [%s], Groups: [%s]", user, groups.toString()); 240 | return groups; 241 | } 242 | } 243 | } 244 | 245 | -------------------------------------------------------------------------------- /LICENSE.txt: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. Definitions. 8 | 9 | "License" shall mean the terms and conditions for use, reproduction, 10 | and distribution as defined by Sections 1 through 9 of this document. 11 | 12 | "Licensor" shall mean the copyright owner or entity authorized by 13 | the copyright owner that is granting the License. 14 | 15 | "Legal Entity" shall mean the union of the acting entity and all 16 | other entities that control, are controlled by, or are under common 17 | control with that entity. For the purposes of this definition, 18 | "control" means (i) the power, direct or indirect, to cause the 19 | direction or management of such entity, whether by contract or 20 | otherwise, or (ii) ownership of fifty percent (50%) or more of the 21 | outstanding shares, or (iii) beneficial ownership of such entity. 22 | 23 | "You" (or "Your") shall mean an individual or Legal Entity 24 | exercising permissions granted by this License. 25 | 26 | "Source" form shall mean the preferred form for making modifications, 27 | including but not limited to software source code, documentation 28 | source, and configuration files. 29 | 30 | "Object" form shall mean any form resulting from mechanical 31 | transformation or translation of a Source form, including but 32 | not limited to compiled object code, generated documentation, 33 | and conversions to other media types. 34 | 35 | "Work" shall mean the work of authorship, whether in Source or 36 | Object form, made available under the License, as indicated by a 37 | copyright notice that is included in or attached to the work 38 | (an example is provided in the Appendix below). 39 | 40 | "Derivative Works" shall mean any work, whether in Source or Object 41 | form, that is based on (or derived from) the Work and for which the 42 | editorial revisions, annotations, elaborations, or other modifications 43 | represent, as a whole, an original work of authorship. For the purposes 44 | of this License, Derivative Works shall not include works that remain 45 | separable from, or merely link (or bind by name) to the interfaces of, 46 | the Work and Derivative Works thereof. 47 | 48 | "Contribution" shall mean any work of authorship, including 49 | the original version of the Work and any modifications or additions 50 | to that Work or Derivative Works thereof, that is intentionally 51 | submitted to Licensor for inclusion in the Work by the copyright owner 52 | or by an individual or Legal Entity authorized to submit on behalf of 53 | the copyright owner. For the purposes of this definition, "submitted" 54 | means any form of electronic, verbal, or written communication sent 55 | to the Licensor or its representatives, including but not limited to 56 | communication on electronic mailing lists, source code control systems, 57 | and issue tracking systems that are managed by, or on behalf of, the 58 | Licensor for the purpose of discussing and improving the Work, but 59 | excluding communication that is conspicuously marked or otherwise 60 | designated in writing by the copyright owner as "Not a Contribution." 61 | 62 | "Contributor" shall mean Licensor and any individual or Legal Entity 63 | on behalf of whom a Contribution has been received by Licensor and 64 | subsequently incorporated within the Work. 65 | 66 | 2. Grant of Copyright License. Subject to the terms and conditions of 67 | this License, each Contributor hereby grants to You a perpetual, 68 | worldwide, non-exclusive, no-charge, royalty-free, irrevocable 69 | copyright license to reproduce, prepare Derivative Works of, 70 | publicly display, publicly perform, sublicense, and distribute the 71 | Work and such Derivative Works in Source or Object form. 72 | 73 | 3. Grant of Patent License. Subject to the terms and conditions of 74 | this License, each Contributor hereby grants to You a perpetual, 75 | worldwide, non-exclusive, no-charge, royalty-free, irrevocable 76 | (except as stated in this section) patent license to make, have made, 77 | use, offer to sell, sell, import, and otherwise transfer the Work, 78 | where such license applies only to those patent claims licensable 79 | by such Contributor that are necessarily infringed by their 80 | Contribution(s) alone or by combination of their Contribution(s) 81 | with the Work to which such Contribution(s) was submitted. If You 82 | institute patent litigation against any entity (including a 83 | cross-claim or counterclaim in a lawsuit) alleging that the Work 84 | or a Contribution incorporated within the Work constitutes direct 85 | or contributory patent infringement, then any patent licenses 86 | granted to You under this License for that Work shall terminate 87 | as of the date such litigation is filed. 88 | 89 | 4. Redistribution. You may reproduce and distribute copies of the 90 | Work or Derivative Works thereof in any medium, with or without 91 | modifications, and in Source or Object form, provided that You 92 | meet the following conditions: 93 | 94 | (a) You must give any other recipients of the Work or 95 | Derivative Works a copy of this License; and 96 | 97 | (b) You must cause any modified files to carry prominent notices 98 | stating that You changed the files; and 99 | 100 | (c) You must retain, in the Source form of any Derivative Works 101 | that You distribute, all copyright, patent, trademark, and 102 | attribution notices from the Source form of the Work, 103 | excluding those notices that do not pertain to any part of 104 | the Derivative Works; and 105 | 106 | (d) If the Work includes a "NOTICE" text file as part of its 107 | distribution, then any Derivative Works that You distribute must 108 | include a readable copy of the attribution notices contained 109 | within such NOTICE file, excluding those notices that do not 110 | pertain to any part of the Derivative Works, in at least one 111 | of the following places: within a NOTICE text file distributed 112 | as part of the Derivative Works; within the Source form or 113 | documentation, if provided along with the Derivative Works; or, 114 | within a display generated by the Derivative Works, if and 115 | wherever such third-party notices normally appear. The contents 116 | of the NOTICE file are for informational purposes only and 117 | do not modify the License. You may add Your own attribution 118 | notices within Derivative Works that You distribute, alongside 119 | or as an addendum to the NOTICE text from the Work, provided 120 | that such additional attribution notices cannot be construed 121 | as modifying the License. 122 | 123 | You may add Your own copyright statement to Your modifications and 124 | may provide additional or different license terms and conditions 125 | for use, reproduction, or distribution of Your modifications, or 126 | for any such Derivative Works as a whole, provided Your use, 127 | reproduction, and distribution of the Work otherwise complies with 128 | the conditions stated in this License. 129 | 130 | 5. Submission of Contributions. Unless You explicitly state otherwise, 131 | any Contribution intentionally submitted for inclusion in the Work 132 | by You to the Licensor shall be under the terms and conditions of 133 | this License, without any additional terms or conditions. 134 | Notwithstanding the above, nothing herein shall supersede or modify 135 | the terms of any separate license agreement you may have executed 136 | with Licensor regarding such Contributions. 137 | 138 | 6. Trademarks. This License does not grant permission to use the trade 139 | names, trademarks, service marks, or product names of the Licensor, 140 | except as required for reasonable and customary use in describing the 141 | origin of the Work and reproducing the content of the NOTICE file. 142 | 143 | 7. Disclaimer of Warranty. Unless required by applicable law or 144 | agreed to in writing, Licensor provides the Work (and each 145 | Contributor provides its Contributions) on an "AS IS" BASIS, 146 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 147 | implied, including, without limitation, any warranties or conditions 148 | of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A 149 | PARTICULAR PURPOSE. You are solely responsible for determining the 150 | appropriateness of using or redistributing the Work and assume any 151 | risks associated with Your exercise of permissions under this License. 152 | 153 | 8. Limitation of Liability. In no event and under no legal theory, 154 | whether in tort (including negligence), contract, or otherwise, 155 | unless required by applicable law (such as deliberate and grossly 156 | negligent acts) or agreed to in writing, shall any Contributor be 157 | liable to You for damages, including any direct, indirect, special, 158 | incidental, or consequential damages of any character arising as a 159 | result of this License or out of the use or inability to use the 160 | Work (including but not limited to damages for loss of goodwill, 161 | work stoppage, computer failure or malfunction, or any and all 162 | other commercial damages or losses), even if such Contributor 163 | has been advised of the possibility of such damages. 164 | 165 | 9. Accepting Warranty or Additional Liability. While redistributing 166 | the Work or Derivative Works thereof, You may choose to offer, 167 | and charge a fee for, acceptance of support, warranty, indemnity, 168 | or other liability obligations and/or rights consistent with this 169 | License. However, in accepting such obligations, You may act only 170 | on Your own behalf and on Your sole responsibility, not on behalf 171 | of any other Contributor, and only if You agree to indemnify, 172 | defend, and hold each Contributor harmless for any liability 173 | incurred by, or claims asserted against, such Contributor by reason 174 | of your accepting any such warranty or additional liability. 175 | 176 | END OF TERMS AND CONDITIONS 177 | 178 | APPENDIX: How to apply the Apache License to your work. 179 | 180 | To apply the Apache License to your work, attach the following 181 | boilerplate notice, with the fields enclosed by brackets "[]" 182 | replaced with your own identifying information. (Don't include 183 | the brackets!) The text should be enclosed in the appropriate 184 | comment syntax for the file format. We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright [yyyy] [name of copyright owner] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. --------------------------------------------------------------------------------