created an api to get metadata

src/main/java/net/gepafin/tendermanagement/web/rest/api/SamlApi.java

@@ -0,0 +1,30 @@
+package net.gepafin.tendermanagement.web.rest.api;
+
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.media.Content;
+import io.swagger.v3.oas.annotations.media.ExampleObject;
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
+import jakarta.servlet.http.HttpServletRequest;
+import net.gepafin.tendermanagement.web.rest.api.errors.ErrorConstants;
+
+public interface SamlApi {
+	
+	  
+    @Operation(summary = "Api to get SP metadata",
+            responses = {
+                    @ApiResponse(responseCode = "200", description = "OK"),
+                    @ApiResponse(responseCode = "404", description = "Not Found", content = @Content(mediaType = MediaType.APPLICATION_JSON_VALUE, examples = {
+                            @ExampleObject(value = ErrorConstants.NOTFOUND_ERROR_EXAMPLE) })),
+                    @ApiResponse(responseCode = "401", description = "Unauthorized", content = @Content(mediaType = MediaType.APPLICATION_JSON_VALUE, examples = {
+                            @ExampleObject(value = ErrorConstants.UNAUTHORIZED_ERROR_EXAMPLE) })),
+                    @ApiResponse(responseCode = "400", description = "Bad Request", content = @Content(mediaType = MediaType.APPLICATION_JSON_VALUE, examples = {
+                            @ExampleObject(value = ErrorConstants.BADREQUEST_ERROR_EXAMPLE) })) })
+    @GetMapping(value = "/gw/metadata",
+            produces = { "application/json" })
+    ResponseEntity<String> getMetadata(HttpServletRequest request);
+
+}

src/main/java/net/gepafin/tendermanagement/web/rest/api/impl/SamlApiController.java

@@ -0,0 +1,33 @@
+package net.gepafin.tendermanagement.web.rest.api.impl;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.saml2.provider.service.metadata.OpenSamlMetadataResolver;
+import org.springframework.security.saml2.provider.service.metadata.Saml2MetadataResolver;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistration;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistrationRepository;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import jakarta.servlet.http.HttpServletRequest;
+import net.gepafin.tendermanagement.web.rest.api.SamlApi;
+
+@RestController
+@RequestMapping("${openapi.gepafin.base-path:/v1/saml}")
+public class SamlApiController implements SamlApi{
+	
+	@Autowired
+	private RelyingPartyRegistrationRepository relyingPartyRegistrationRepository;
+	
+	@Override
+	public ResponseEntity<String> getMetadata(HttpServletRequest request) {
+		Saml2MetadataResolver metadataResolver = new OpenSamlMetadataResolver();
+		RelyingPartyRegistration registration = relyingPartyRegistrationRepository.findByRegistrationId("loginumbria");
+        return ResponseEntity.status(HttpStatus.OK).header("Content-Type", MediaType.APPLICATION_XML_VALUE)
+                .body(metadataResolver.resolve(registration));
+
+	}
+
+}