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22 * @file saml/saml2/metadata/MetadataProvider.h
24 * Supplies an individual source of metadata.
27 #ifndef __saml2_metadataprov_h__
28 #define __saml2_metadataprov_h__
30 #include <saml/base.h>
34 #include <xmltooling/exceptions.h>
35 #include <xmltooling/security/CredentialResolver.h>
37 namespace xmltooling {
38 class XMLTOOL_API QName;
39 class XMLTOOL_API XMLObject;
44 class SAML_API SAMLArtifact;
48 class SAML_API EntityDescriptor;
49 class SAML_API EntitiesDescriptor;
50 class SAML_API RoleDescriptor;
51 class SAML_API MetadataCredentialResolver;
52 class SAML_API MetadataFilter;
54 #if defined (_MSC_VER)
55 #pragma warning( push )
56 #pragma warning( disable : 4251 )
60 * Supplies an individual source of metadata.
62 * The source can be a local file, remote service, or the result of a
63 * dynamic lookup, can include local caching, etc. Providers
64 * <strong>MUST</strong> be locked before any lookup operations.
66 class SAML_API MetadataProvider : public virtual xmltooling::CredentialResolver
68 MAKE_NONCOPYABLE(MetadataProvider);
73 * If a DOM is supplied, a set of default logic will be used to identify
74 * and build MetadataFilter plugins and install them into the provider.
76 * The following XML content is supported:
79 * <li><MetadataFilter> elements with a type attribute and type-specific content
80 * <li><Exclude> elements representing a BlacklistMetadataFilter
81 * <li><BlacklistMetadataFilter> element containing <Exclude> elements
82 * <li><Include> elements representing a WhitelistMetadataFilter
83 * <li><SignatureMetadataFilter> element containing a <KeyResolver> element
84 * <li><WhitelistMetadataFilter> element containing <Include> elements
87 * XML namespaces are ignored in the processing of these elements.
89 * @param e DOM to supply configuration for provider
91 MetadataProvider(const xercesc::DOMElement* e=nullptr);
95 * Destructor will delete any installed filters.
97 virtual ~MetadataProvider();
100 * Returns an identifier for the provider for logging/status purposes.
102 * @return an identifier, or null
104 virtual const char* getId() const;
107 * Adds a metadata filter to apply to any resolved metadata. Will not be applied
108 * to metadata that is already loaded.
110 * @param newFilter metadata filter to add
112 virtual void addMetadataFilter(MetadataFilter* newFilter);
115 * Removes a metadata filter. The caller must delete the filter if necessary.
117 * @param oldFilter metadata filter to remove
118 * @return the old filter
120 virtual MetadataFilter* removeMetadataFilter(MetadataFilter* oldFilter);
123 * Should be called after instantiating provider and adding filters, but before
124 * performing any lookup operations. Allows the provider to defer initialization
125 * processes that are likely to result in exceptions until after the provider is
126 * safely created. Providers SHOULD perform as much processing as possible in
127 * this method so as to report/log any errors that would affect later processing.
129 virtual void init()=0;
132 * Generate an XML representation of the provider's status. The XML must be
133 * well-formed, but is otherwise arbitrary.
135 * @param os stream to write status information to
137 virtual void outputStatus(std::ostream& os) const;
140 * Gets the entire metadata tree, after the registered filter has been applied.
141 * The caller MUST unlock the provider when finished with the data.
143 * @return the entire metadata tree
145 virtual const xmltooling::XMLObject* getMetadata() const=0;
148 * Gets the metadata for a given group of entities. If a valid group is returned,
149 * the resolver will be left in a locked state. The caller MUST unlock the
150 * resolver when finished with the group.
152 * @param name the name of the group
153 * @param requireValidMetadata indicates whether the metadata for the group must be valid/current
155 * @return the group's metadata or nullptr if there is no metadata or no valid metadata
157 virtual const EntitiesDescriptor* getEntitiesDescriptor(const XMLCh* name, bool requireValidMetadata=true) const;
160 * Gets the metadata for a given group of entities. If a valid group is returned,
161 * the resolver will be left in a locked state. The caller MUST unlock the
162 * resolver when finished with the group.
164 * @param name the name of the group
165 * @param requireValidMetadata indicates whether the metadata for the group must be valid/current
167 * @return the group's metadata or nullptr if there is no metadata or no valid metadata
169 virtual const EntitiesDescriptor* getEntitiesDescriptor(const char* name, bool requireValidMetadata=true) const=0;
172 * Batches up criteria for entity lookup.
174 struct SAML_API Criteria {
176 * Default constructor.
183 * @param id entityID to lookup
184 * @param q element/type of role, if any
185 * @param prot protocol support constant, if any
186 * @param valid true iff stale metadata should be ignored
188 Criteria(const XMLCh* id, const xmltooling::QName* q=nullptr, const XMLCh* prot=nullptr, bool valid=true);
193 * @param id entityID to lookup
194 * @param q element/type of role, if any
195 * @param prot protocol support constant, if any
196 * @param valid true iff stale metadata should be ignored
198 Criteria(const char* id, const xmltooling::QName* q=nullptr, const XMLCh* prot=nullptr, bool valid=true);
203 * @param a artifact to lookup
204 * @param q element/type of role, if any
205 * @param prot protocol support constant, if any
206 * @param valid true iff stale metadata should be ignored
208 Criteria(const SAMLArtifact* a, const xmltooling::QName* q=nullptr, const XMLCh* prot=nullptr, bool valid=true);
213 * Restores the object to its default state.
215 virtual void reset();
217 /** Unique ID of entity. */
218 const XMLCh* entityID_unicode;
219 /** Unique ID of entity. */
220 const char* entityID_ascii;
222 const SAMLArtifact* artifact;
223 /** Element or schema type QName of metadata role. */
224 const xmltooling::QName* role;
225 /** Protocol support constant. */
226 const XMLCh* protocol;
227 /** Backup protocol support constant. */
228 const XMLCh* protocol2;
229 /** Controls whether stale metadata is ignored. */
234 * Gets entity metadata based on supplied criteria. If a valid entity is returned,
235 * the provider will be left in a locked state. The caller MUST unlock the
236 * provider when finished with the entity.
238 * @param criteria lookup criteria
240 * @return the entity's metadata (and optionally a role) or nullptr if there is no qualifying metadata
242 virtual std::pair<const EntityDescriptor*,const RoleDescriptor*> getEntityDescriptor(const Criteria& criteria) const=0;
246 * Applies any installed filters to a metadata instance.
248 * @param xmlObject the metadata to be filtered
250 void doFilters(xmltooling::XMLObject& xmlObject) const;
253 std::vector<MetadataFilter*> m_filters;
256 #if defined (_MSC_VER)
257 #pragma warning( pop )
261 * Registers MetadataProvider classes into the runtime.
263 void SAML_API registerMetadataProviders();
265 /** MetadataProvider based on local or remote XML file */
266 #define XML_METADATA_PROVIDER "XML"
268 /** MetadataProvider based on dynamic resolution */
269 #define DYNAMIC_METADATA_PROVIDER "Dynamic"
271 /** MetadataProvider that wraps a sequence of metadata providers. */
272 #define CHAINING_METADATA_PROVIDER "Chaining"
274 /** MetadataProvider that loads a directory of files. */
275 #define FOLDER_METADATA_PROVIDER "Folder"
277 /** MetadataProvider that returns an empty "dummy" entity descriptor. */
278 #define NULL_METADATA_PROVIDER "Null"
280 DECL_XMLTOOLING_EXCEPTION(MetadataException,SAML_EXCEPTIONAPI(SAML_API),opensaml::saml2md,xmltooling::XMLToolingException,Exceptions related to metadata use);
284 #endif /* __saml2_metadataprov_h__ */