Add interceptor to inject correlation id in http requests.

backend/codiki-application/src/main/java/org/codiki/application/security/model/CustomUserDetails.java

@@ -25,6 +25,10 @@ public class CustomUserDetails implements UserDetails {
             .toList();
     }
 
+    public User getUser() {
+        return user;
+    }
+
     @Override
     public String getUsername() {
         return user.id().toString();

backend/codiki-application/src/main/java/org/codiki/application/traffic/TrafficTraceUseCases.java

@@ -0,0 +1,47 @@
+package org.codiki.application.traffic;
+
+import jakarta.annotation.Nullable;
+import org.codiki.domain.traffic.exception.TrafficTraceCreationException;
+import org.codiki.domain.traffic.model.TrafficEndpoint;
+import org.codiki.domain.traffic.model.TrafficTrace;
+import org.codiki.domain.traffic.port.TrafficTracePort;
+import org.springframework.scheduling.annotation.Async;
+import org.springframework.stereotype.Component;
+
+import java.time.Clock;
+import java.time.ZonedDateTime;
+import java.util.UUID;
+
+import static java.util.Objects.isNull;
+import static org.codiki.domain.traffic.model.TrafficTrace.aTrafficTrace;
+
+@Component
+public class TrafficTraceUseCases {
+    private final TrafficTracePort trafficTracePort;
+    private final Clock clock;
+
+    public TrafficTraceUseCases(TrafficTracePort trafficTracePort, Clock clock) {
+        this.trafficTracePort = trafficTracePort;
+        this.clock = clock;
+    }
+
+    @Async
+    public void saveNewTrace(
+            TrafficEndpoint trafficEndpoint,
+            @Nullable UUID userId,
+            @Nullable String correlationId
+    ) {
+        if (isNull(trafficEndpoint)) {
+            throw new TrafficTraceCreationException("Traffic endpoint should not be null.");
+        }
+
+        TrafficTrace newTrace = aTrafficTrace()
+                .withId(UUID.randomUUID())
+                .withDateTime(ZonedDateTime.now(clock))
+                .withEndpoint(trafficEndpoint)
+                .withUserId(userId)
+                .withCorrelationId(correlationId)
+                .build();
+        trafficTracePort.save(newTrace);
+    }
+}

backend/codiki-application/src/main/java/org/codiki/application/user/UserUseCases.java

@@ -87,9 +87,7 @@ public class UserUseCases {
             .map(Authentication::getPrincipal)
             .filter(CustomUserDetails.class::isInstance)
             .map(CustomUserDetails.class::cast)
-            .map(CustomUserDetails::getUsername)
+            .map(CustomUserDetails::getUser);
-            .map(UUID::fromString)
-            .flatMap(userPort::findById);
     }
 
     private UserAuthenticationData generateAuthenticationData(User user) {

backend/codiki-domain/src/main/java/org/codiki/domain/traffic/exception/TrafficTraceCreationException.java

@@ -0,0 +1,9 @@
+package org.codiki.domain.traffic.exception;
+
+import org.codiki.domain.exception.FunctionnalException;
+
+public class TrafficTraceCreationException extends FunctionnalException {
+    public TrafficTraceCreationException(String message) {
+        super(message);
+    }
+}

backend/codiki-domain/src/main/java/org/codiki/domain/traffic/model/HttpMethod.java

@@ -0,0 +1,14 @@
+package org.codiki.domain.traffic.model;
+
+import java.util.Arrays;
+import java.util.Optional;
+
+public enum HttpMethod {
+    GET, POST, PUT, DELETE;
+
+    public static Optional<HttpMethod> fromString(String methodAsString) {
+        return Arrays.stream(values())
+                .filter(method -> method.name().equals(methodAsString))
+                .findFirst();
+    }
+}

backend/codiki-domain/src/main/java/org/codiki/domain/traffic/model/TrafficEndpoint.java

@@ -0,0 +1,6 @@
+package org.codiki.domain.traffic.model;
+
+public record TrafficEndpoint(
+        HttpMethod method,
+        String path
+) {}

backend/codiki-domain/src/main/java/org/codiki/domain/traffic/model/TrafficTrace.java

@@ -0,0 +1,55 @@
+package org.codiki.domain.traffic.model;
+
+import java.time.ZonedDateTime;
+import java.util.UUID;
+
+public record TrafficTrace(
+        UUID id,
+        ZonedDateTime dateTime,
+        TrafficEndpoint endpoint,
+        UUID userId,
+        String correlationId
+) {
+    public static Builder aTrafficTrace() {
+        return new Builder();
+    }
+
+    public static class Builder {
+        private UUID id;
+        private ZonedDateTime dateTime;
+        private TrafficEndpoint endpoint;
+        private UUID userId;
+        private String correlationId;
+
+        private Builder() {}
+
+        public Builder withId(UUID id) {
+            this.id = id;
+            return this;
+        }
+
+        public Builder withDateTime(ZonedDateTime dateTime) {
+            this.dateTime = dateTime;
+            return this;
+        }
+
+        public Builder withEndpoint(TrafficEndpoint endpoint) {
+            this.endpoint = endpoint;
+            return this;
+        }
+
+        public Builder withUserId(UUID userId) {
+            this.userId = userId;
+            return this;
+        }
+
+        public Builder withCorrelationId(String correlationId) {
+            this.correlationId = correlationId;
+            return this;
+        }
+
+        public TrafficTrace build() {
+            return new TrafficTrace(id, dateTime, endpoint, userId, correlationId);
+        }
+    }
+}

backend/codiki-domain/src/main/java/org/codiki/domain/traffic/port/TrafficTracePort.java

@@ -0,0 +1,14 @@
+package org.codiki.domain.traffic.port;
+
+import org.codiki.domain.traffic.model.TrafficTrace;
+
+import java.time.ZonedDateTime;
+import java.util.List;
+
+public interface TrafficTracePort {
+    void save(TrafficTrace trace);
+    List<TrafficTrace> getAllInPeriod(ZonedDateTime startDate, ZonedDateTime endDate);
+    List<TrafficTrace> getAllByCorrelationId(String correlationId);
+    Integer countAllInPeriod(ZonedDateTime startDate, ZonedDateTime endDate);
+    Integer countByCorrelationId(String correlationId);
+}

backend/codiki-exposition/pom.xml

@@ -25,6 +25,10 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-aop</artifactId>
+        </dependency>
         <dependency>
             <groupId>org.projectlombok</groupId>
             <artifactId>lombok</artifactId>
@@ -33,28 +37,5 @@
             <groupId>org.apache.tika</groupId>
             <artifactId>tika-core</artifactId>
         </dependency>
-<!--        <dependency>-->
-<!--            <groupId>org.springframework.boot</groupId>-->
-<!--            <artifactId>spring-boot-starter-data-jpa</artifactId>-->
-<!--        </dependency>-->
-<!--        <dependency>-->
-<!--            <groupId>org.springframework.boot</groupId>-->
-<!--            <artifactId>spring-boot-starter-security</artifactId>-->
-<!--        </dependency>-->
-<!--        <dependency>-->
-<!--            <groupId>org.postgresql</groupId>-->
-<!--            <artifactId>postgresql</artifactId>-->
-<!--            <scope>runtime</scope>-->
-<!--        </dependency>-->
-<!--        <dependency>-->
-<!--            <groupId>org.springframework.boot</groupId>-->
-<!--            <artifactId>spring-boot-starter-test</artifactId>-->
-<!--            <scope>test</scope>-->
-<!--        </dependency>-->
-<!--        <dependency>-->
-<!--            <groupId>org.springframework.security</groupId>-->
-<!--            <artifactId>spring-security-test</artifactId>-->
-<!--            <scope>test</scope>-->
-<!--        </dependency>-->
     </dependencies>
 </project>

backend/codiki-exposition/src/main/java/org/codiki/exposition/configuration/TrafficTraceConfiguration.java

@@ -0,0 +1,12 @@
+package org.codiki.exposition.configuration;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.EnableAspectJAutoProxy;
+import org.springframework.scheduling.annotation.EnableAsync;
+
+@Configuration
+@EnableAspectJAutoProxy
+@EnableAsync
+public class TrafficTraceConfiguration {
+
+}

backend/codiki-exposition/src/main/java/org/codiki/exposition/configuration/security/JwtAuthenticationFilter.java

@@ -38,10 +38,6 @@ public class JwtAuthenticationFilter extends OncePerRequestFilter {
             .filter(authorizationHeader -> !isEmpty(authorizationHeader))
             .filter(authorizationHeader -> authorizationHeader.startsWith(BEARER_PREFIX))
             .map(authorizationHeader -> authorizationHeader.substring(BEARER_PREFIX.length()))
-            .filter(token -> {
-                String authorizationHeader = request.getHeader(AUTHORIZATION);
-                return !isEmpty(authorizationHeader) && authorizationHeader.startsWith(BEARER_PREFIX);
-            })
             .filter(jwtService::isValid)
             .flatMap(jwtService::extractUser)
             .map(CustomUserDetails::new)

backend/codiki-exposition/src/main/java/org/codiki/exposition/traffic/ApiCallsLoggerAspect.java

@@ -0,0 +1,75 @@
+package org.codiki.exposition.traffic;
+
+import jakarta.servlet.http.HttpServletRequest;
+import org.aspectj.lang.JoinPoint;
+import org.aspectj.lang.annotation.Aspect;
+import org.aspectj.lang.annotation.Before;
+import org.codiki.application.traffic.TrafficTraceUseCases;
+import org.codiki.application.user.UserUseCases;
+import org.codiki.domain.traffic.model.HttpMethod;
+import org.codiki.domain.traffic.model.TrafficEndpoint;
+import org.codiki.domain.user.model.User;
+import org.springframework.stereotype.Component;
+import org.springframework.web.context.request.RequestContextHolder;
+import org.springframework.web.context.request.ServletRequestAttributes;
+
+import java.util.Optional;
+import java.util.UUID;
+
+@Component
+@Aspect
+public class ApiCallsLoggerAspect {
+    private static final String HTTP_HEADER_CORRELATION_ID = "x-correlation-id";
+
+    private final TrafficTraceUseCases trafficTraceUseCases;
+    private final UserUseCases userUseCases;
+
+    public ApiCallsLoggerAspect(
+            TrafficTraceUseCases trafficTraceUseCases,
+            UserUseCases userUseCases
+    ) {
+        this.trafficTraceUseCases = trafficTraceUseCases;
+        this.userUseCases = userUseCases;
+    }
+
+    @Before("@annotation(org.springframework.web.bind.annotation.GetMapping)")
+    public void logGetApiCall(JoinPoint joinPoint) {
+       logApiCall();
+    }
+
+    @Before("@annotation(org.springframework.web.bind.annotation.PostMapping)")
+    public void logPostApiCall(JoinPoint joinPoint) {
+       logApiCall();
+    }
+    @Before("@annotation(org.springframework.web.bind.annotation.PutMapping)")
+    public void logPutApiCall(JoinPoint joinPoint) {
+       logApiCall();
+    }
+    @Before("@annotation(org.springframework.web.bind.annotation.DeleteMapping)")
+    public void logDeleteApiCall(JoinPoint joinPoint) {
+       logApiCall();
+    }
+
+    private void logApiCall() {
+        getHttpServletRequest().ifPresent(request ->
+                Optional.of(request.getMethod())
+                        .flatMap(HttpMethod::fromString)
+                        .ifPresent(queryHttpMethod -> {
+                            String queryUriPath = request.getRequestURI();
+                            TrafficEndpoint endpoint = new TrafficEndpoint(queryHttpMethod, queryUriPath);
+                            UUID userId = userUseCases.getAuthenticatedUser()
+                                    .map(User::id)
+                                    .orElse(null);
+                            String correlationId = request.getHeader(HTTP_HEADER_CORRELATION_ID);
+                            trafficTraceUseCases.saveNewTrace(endpoint, userId, correlationId);
+                        })
+        );
+    }
+
+    private static Optional<HttpServletRequest> getHttpServletRequest() {
+        return Optional.ofNullable(RequestContextHolder.getRequestAttributes())
+                .filter(ServletRequestAttributes.class::isInstance)
+                .map(ServletRequestAttributes.class::cast)
+                .map(ServletRequestAttributes::getRequest);
+    }
+}

backend/codiki-infrastructure/src/main/java/org/codiki/infrastructure/traffic/TrafficTraceJpaAdapter.java

@@ -0,0 +1,45 @@
+package org.codiki.infrastructure.traffic;
+
+import org.codiki.domain.traffic.model.TrafficTrace;
+import org.codiki.domain.traffic.port.TrafficTracePort;
+import org.codiki.infrastructure.traffic.model.TrafficTraceEntity;
+import org.codiki.infrastructure.traffic.repository.TrafficTraceEntityJpaRepository;
+import org.springframework.stereotype.Component;
+
+import java.time.ZonedDateTime;
+import java.util.List;
+
+@Component
+public class TrafficTraceJpaAdapter implements TrafficTracePort {
+    private final TrafficTraceEntityJpaRepository repository;
+
+    public TrafficTraceJpaAdapter(TrafficTraceEntityJpaRepository repository) {
+        this.repository = repository;
+    }
+
+    @Override
+    public void save(TrafficTrace trace) {
+        TrafficTraceEntity entity = new TrafficTraceEntity(trace);
+        repository.save(entity);
+    }
+
+    @Override
+    public List<TrafficTrace> getAllInPeriod(ZonedDateTime startDate, ZonedDateTime endDate) {
+        return List.of();
+    }
+
+    @Override
+    public List<TrafficTrace> getAllByCorrelationId(String correlationId) {
+        return List.of();
+    }
+
+    @Override
+    public Integer countAllInPeriod(ZonedDateTime startDate, ZonedDateTime endDate) {
+        return 0;
+    }
+
+    @Override
+    public Integer countByCorrelationId(String correlationId) {
+        return 0;
+    }
+}

backend/codiki-infrastructure/src/main/java/org/codiki/infrastructure/traffic/model/HttpMethodEntity.java

@@ -0,0 +1,25 @@
+package org.codiki.infrastructure.traffic.model;
+
+import org.codiki.domain.traffic.model.HttpMethod;
+
+public enum HttpMethodEntity {
+    GET, POST, PUT, DELETE;
+
+    public HttpMethod toDomain() {
+        return switch (this) {
+            case GET -> HttpMethod.GET;
+            case POST -> HttpMethod.POST;
+            case PUT -> HttpMethod.PUT;
+            case DELETE -> HttpMethod.DELETE;
+        };
+    }
+
+    public static HttpMethodEntity fromDomain(HttpMethod method) {
+        return switch (method) {
+            case HttpMethod.GET -> GET;
+            case HttpMethod.POST -> POST;
+            case HttpMethod.PUT -> PUT;
+            case HttpMethod.DELETE -> DELETE;
+        };
+    }
+}

backend/codiki-infrastructure/src/main/java/org/codiki/infrastructure/traffic/model/TrafficTraceEntity.java

@@ -0,0 +1,56 @@
+package org.codiki.infrastructure.traffic.model;
+
+import jakarta.persistence.*;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+import org.codiki.domain.traffic.model.TrafficEndpoint;
+import org.codiki.domain.traffic.model.TrafficTrace;
+
+import java.time.ZonedDateTime;
+import java.util.UUID;
+
+import static org.codiki.domain.traffic.model.TrafficTrace.aTrafficTrace;
+
+@NoArgsConstructor
+@AllArgsConstructor
+@Getter
+@Setter
+@Entity
+@Table(name = "traffic")
+public class TrafficTraceEntity {
+    @Id
+    private UUID id;
+    @Column(nullable = false)
+    private ZonedDateTime dateTime;
+    @Column(nullable = false)
+    @Enumerated
+    private HttpMethodEntity endpointMethod;
+    @Column(nullable = false)
+    private String endpointPath;
+    private UUID userId;
+    private String correlationId;
+
+    public TrafficTraceEntity(TrafficTrace trace) {
+        id = trace.id();
+        dateTime = trace.dateTime();
+        endpointMethod = HttpMethodEntity.fromDomain(trace.endpoint().method());
+        endpointPath = trace.endpoint().path();
+        userId = trace.userId();
+        correlationId = trace.correlationId();
+    }
+
+    public TrafficTrace toDomain() {
+        return aTrafficTrace()
+                .withId(id)
+                .withDateTime(dateTime)
+                .withEndpoint(new TrafficEndpoint(
+                        endpointMethod.toDomain(),
+                        endpointPath
+                ))
+                .withUserId(userId)
+                .withCorrelationId(correlationId)
+                .build();
+    }
+}

backend/codiki-infrastructure/src/main/java/org/codiki/infrastructure/traffic/repository/TrafficTraceEntityJpaRepository.java

@@ -0,0 +1,12 @@
+package org.codiki.infrastructure.traffic.repository;
+
+import org.codiki.infrastructure.traffic.model.TrafficTraceEntity;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.util.UUID;
+
+@Repository
+public interface TrafficTraceEntityJpaRepository extends JpaRepository<TrafficTraceEntity, UUID> {
+
+}

backend/codiki-infrastructure/src/main/resources/sql/002-traffic-trace-table.sql

@@ -0,0 +1,11 @@
+CREATE TABLE IF NOT EXISTS traffic (
+    id UUID NOT NULL,
+    date_time TIMESTAMP WITH TIME ZONE NOT NULL,
+    endpoint_method SMALLINT NOT NULL,
+    endpoint_path VARCHAR NOT NULL,
+    user_id UUID,
+    correlation_id VARCHAR,
+    CONSTRAINT traffic_pk PRIMARY KEY (id),
+    CONSTRAINT traffic_user_id_fk FOREIGN KEY (user_id) REFERENCES "user" (id)
+);
+CREATE INDEX traffic_user_id_idx ON traffic (user_id);

backend/pom.xml

@@ -15,11 +15,11 @@
 		<java.version>21</java.version>
 		<maven.compiler.source>21</maven.compiler.source>
 		<maven.compiler.target>21</maven.compiler.target>
-		<jakarta.servlet-api.version>6.0.0</jakarta.servlet-api.version>
+		<jakarta.servlet-api.version>6.1.0</jakarta.servlet-api.version>
 		<java-jwt.version>4.4.0</java-jwt.version>
-		<postgresql.version>42.7.0</postgresql.version>
 		<tika-core.version>2.9.0</tika-core.version>
-		<commons-lang3.version>3.14.0</commons-lang3.version>
+		<postgresql.version>42.7.4</postgresql.version>
+		<commons-lang3.version>3.17.0</commons-lang3.version>
 	</properties>
 
 	<modules>
@@ -35,7 +35,7 @@
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-dependencies</artifactId>
-				<version>3.2.0</version>
+				<version>3.3.4</version>
 				<type>pom</type>
 				<scope>import</scope>
 			</dependency>
@@ -84,8 +84,6 @@
 				<artifactId>commons-lang3</artifactId>
 				<version>${commons-lang3.version}</version>
 			</dependency>
-
-
 		</dependencies>
 	</dependencyManagement>
 

frontend/package-lock.json

@@ -20,6 +20,7 @@
         "@angular/router": "^18.2.5",
         "rxjs": "~7.8.0",
         "tslib": "^2.3.0",
+        "uuid": "^10.0.0",
         "zone.js": "~0.14.10"
       },
       "devDependencies": {
@@ -28,6 +29,7 @@
         "@angular/compiler-cli": "^18.2.5",
         "@angular/localize": "^18.2.5",
         "@types/jasmine": "~5.1.0",
+        "@types/uuid": "^10.0.0",
         "jasmine-core": "~5.1.0",
         "karma": "~6.4.0",
         "karma-chrome-launcher": "~3.2.0",
@@ -4655,6 +4657,13 @@
         "@types/node": "*"
       }
     },
+    "node_modules/@types/uuid": {
+      "version": "10.0.0",
+      "resolved": "https://registry.npmjs.org/@types/uuid/-/uuid-10.0.0.tgz",
+      "integrity": "sha512-7gqG38EyHgyP1S+7+xomFtL+ZNHcKv6DwNaCZmJmo1vgMugyF3TCnXVg4t1uk89mLNwnLtnY3TpOpCOyp1/xHQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@types/wrap-ansi": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/@types/wrap-ansi/-/wrap-ansi-3.0.0.tgz",
@@ -12427,6 +12436,16 @@
         "websocket-driver": "^0.7.4"
       }
     },
+    "node_modules/sockjs/node_modules/uuid": {
+      "version": "8.3.2",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-8.3.2.tgz",
+      "integrity": "sha512-+NYs2QeMWy+GWFOEm9xnn6HCDp0l7QBD7ml8zLUmJ+93Q5NF0NocErnwkTkXVFNiX3/fpC6afS8Dhb/gz7R7eg==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "uuid": "dist/bin/uuid"
+      }
+    },
     "node_modules/socks": {
       "version": "2.8.3",
       "resolved": "https://registry.npmjs.org/socks/-/socks-2.8.3.tgz",
@@ -13315,10 +13334,13 @@
       }
     },
     "node_modules/uuid": {
-      "version": "8.3.2",
+      "version": "10.0.0",
-      "resolved": "https://registry.npmjs.org/uuid/-/uuid-8.3.2.tgz",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-10.0.0.tgz",
-      "integrity": "sha512-+NYs2QeMWy+GWFOEm9xnn6HCDp0l7QBD7ml8zLUmJ+93Q5NF0NocErnwkTkXVFNiX3/fpC6afS8Dhb/gz7R7eg==",
+      "integrity": "sha512-8XkAphELsDnEGrDxUOHB3RGvXz6TeuYSGEZBOjtTtPm2lwhGBjLgOzLHB63IUWfBpNucQjND6d3AOudO+H3RWQ==",
-      "dev": true,
+      "funding": [
+        "https://github.com/sponsors/broofa",
+        "https://github.com/sponsors/ctavan"
+      ],
       "license": "MIT",
       "bin": {
         "uuid": "dist/bin/uuid"

frontend/package.json

@@ -29,6 +29,7 @@
     "@angular/router": "^18.2.5",
     "rxjs": "~7.8.0",
     "tslib": "^2.3.0",
+    "uuid": "^10.0.0",
     "zone.js": "~0.14.10"
   },
   "devDependencies": {
@@ -37,6 +38,7 @@
     "@angular/compiler-cli": "^18.2.5",
     "@angular/localize": "^18.2.5",
     "@types/jasmine": "~5.1.0",
+    "@types/uuid": "^10.0.0",
     "jasmine-core": "~5.1.0",
     "karma": "~6.4.0",
     "karma-chrome-launcher": "~3.2.0",

frontend/src/app/app.config.ts

@@ -5,6 +5,7 @@ import { HTTP_INTERCEPTORS, provideHttpClient, withInterceptorsFromDi } from '@a
 import { provideAnimationsAsync } from '@angular/platform-browser/animations/async';
 import { routes } from './app.routes';
 import { JwtInterceptor } from './core/interceptor/jwt.interceptor';
+import { CorrelationIdInterceptor } from './core/interceptor/correlation-id.interceptor';
 
 export const appConfig: ApplicationConfig = {
   providers: [
@@ -18,5 +19,6 @@ export const appConfig: ApplicationConfig = {
     provideAnimationsAsync(),
     provideHttpClient(withInterceptorsFromDi()),
     { provide: HTTP_INTERCEPTORS, useClass: JwtInterceptor, multi: true },
+    { provide: HTTP_INTERCEPTORS, useClass: CorrelationIdInterceptor, multi: true },
   ]
 };

frontend/src/app/core/interceptor/correlation-id.interceptor.ts

@@ -0,0 +1,20 @@
+import { HttpEvent, HttpHandler, HttpInterceptor, HttpRequest } from "@angular/common/http";
+import { inject, Injectable } from "@angular/core";
+import { Observable } from "rxjs";
+import { CorrelationIdService } from "../service/correlation-id.service";
+
+@Injectable()
+export class CorrelationIdInterceptor implements HttpInterceptor {
+    private readonly correlationIdService = inject(CorrelationIdService);
+
+    intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
+        const correlationId = this.correlationIdService.getCorrelationId();
+
+        const requestWithCorrelationId = request.clone({
+            headers: request.headers.set('x-correlation-id', correlationId)
+        });
+
+        return next.handle(requestWithCorrelationId);
+    }
+
+}

frontend/src/app/core/service/correlation-id.service.ts

@@ -0,0 +1,27 @@
+import { Injectable } from "@angular/core";
+import * as uuid from 'uuid';
+
+const CORRELATION_ID_KEY = 'correlationId';
+
+@Injectable({
+    providedIn: 'root'
+})
+export class CorrelationIdService {
+    getCorrelationId(): string {
+        let correlationId = this.getCorrelationFromLocalStorage();
+        if (correlationId === undefined) {
+            correlationId = this.createNewCorrelationId();
+        }
+        return correlationId;
+    }
+
+    private getCorrelationFromLocalStorage(): string | undefined {
+        return localStorage.getItem(CORRELATION_ID_KEY) ?? undefined;
+    }
+
+    private createNewCorrelationId(): string {
+        const newCorrelationId = uuid.v4();
+        localStorage.setItem(CORRELATION_ID_KEY, newCorrelationId);
+        return newCorrelationId;
+    }
+}