Introduce index resource with first links

scm-webapp/src/main/java/sonia/scm/api/v2/resources/IndexDto.java

@@ -0,0 +1,11 @@
+package sonia.scm.api.v2.resources;
+
+import de.otto.edison.hal.HalRepresentation;
+import de.otto.edison.hal.Links;
+
+public class IndexDto extends HalRepresentation {
+
+  IndexDto(Links links) {
+    super(links);
+  }
+}

scm-webapp/src/main/java/sonia/scm/api/v2/resources/IndexDtoGenerator.java

@@ -0,0 +1,34 @@
+package sonia.scm.api.v2.resources;
+
+import de.otto.edison.hal.Link;
+import de.otto.edison.hal.Links;
+import org.apache.shiro.SecurityUtils;
+
+import javax.inject.Inject;
+
+public class IndexDtoGenerator {
+
+  private final ResourceLinks resourceLinks;
+
+  @Inject
+  public IndexDtoGenerator(ResourceLinks resourceLinks) {
+    this.resourceLinks = resourceLinks;
+  }
+
+  public IndexDto generate() {
+    Links.Builder builder = Links.linkingTo();
+    if (SecurityUtils.getSubject().isAuthenticated()) {
+      builder.single(
+        Link.link("me", resourceLinks.me().self()),
+        Link.link("logout", resourceLinks.authentication().logout())
+      );
+    } else {
+      builder.single(
+        Link.link("formLogin", resourceLinks.authentication().formLogin()),
+        Link.link("jsonLogin", resourceLinks.authentication().jsonLogin())
+      );
+    }
+
+    return new IndexDto(builder.build());
+  }
+}

scm-webapp/src/main/java/sonia/scm/api/v2/resources/IndexResource.java

@@ -0,0 +1,22 @@
+package sonia.scm.api.v2.resources;
+
+import javax.inject.Inject;
+import javax.ws.rs.GET;
+import javax.ws.rs.Path;
+
+@Path(IndexResource.INDEX_PATH_V2)
+public class IndexResource {
+  public static final String INDEX_PATH_V2 = "v2/";
+
+  private final IndexDtoGenerator indexDtoGenerator;
+
+  @Inject
+  public IndexResource(IndexDtoGenerator indexDtoGenerator) {
+    this.indexDtoGenerator = indexDtoGenerator;
+  }
+
+  @GET
+  public IndexDto getIndex() {
+    return indexDtoGenerator.generate();
+  }
+}

scm-webapp/src/main/java/sonia/scm/api/v2/resources/ResourceLinks.java

@@ -3,7 +3,6 @@ package sonia.scm.api.v2.resources;
 import sonia.scm.repository.NamespaceAndName;
 
 import javax.inject.Inject;
-import javax.ws.rs.core.UriInfo;
 import java.net.URI;
 
 class ResourceLinks {
@@ -473,4 +472,28 @@ class ResourceLinks {
       return uiPluginCollectionLinkBuilder.method("plugins").parameters().method("getInstalledPlugins").parameters().href();
     }
   }
+
+  public AuthenticationLinks authentication() {
+    return new AuthenticationLinks(scmPathInfoStore.get());
+  }
+
+  static class AuthenticationLinks {
+    private final LinkBuilder loginLinkBuilder;
+
+    AuthenticationLinks(ScmPathInfo pathInfo) {
+      this.loginLinkBuilder = new LinkBuilder(pathInfo, AuthenticationResource.class);
+    }
+
+    String formLogin() {
+      return loginLinkBuilder.method("authenticateViaForm").parameters().href();
+    }
+
+    String jsonLogin() {
+      return loginLinkBuilder.method("authenticateViaJSONBody").parameters().href();
+    }
+
+    String logout() {
+      return loginLinkBuilder.method("logout").parameters().href();
+    }
+  }
 }

scm-webapp/src/main/java/sonia/scm/security/DefaultAuthorizationCollector.java

@@ -56,6 +56,7 @@ import sonia.scm.plugin.Extension;
 import sonia.scm.repository.Repository;
 import sonia.scm.repository.RepositoryDAO;
 import sonia.scm.user.User;
+import sonia.scm.user.UserPermissions;
 import sonia.scm.util.Util;
 
 import java.util.List;
@@ -254,6 +255,7 @@ public class DefaultAuthorizationCollector implements AuthorizationCollector
 
       collectGlobalPermissions(builder, user, groups);
       collectRepositoryPermissions(builder, user, groups);
+      builder.add(canReadOwnUser(user));
       permissions = builder.build();
     }
 
@@ -262,6 +264,10 @@ public class DefaultAuthorizationCollector implements AuthorizationCollector
     return info;
   }
 
+  private String canReadOwnUser(User user) {
+    return "user:" + UserPermissions.ACTION_READ + ":" + user.getName();
+  }
+
   //~--- get methods ----------------------------------------------------------
 
   private boolean isUserPermitted(User user, GroupNames groups,

scm-webapp/src/test/java/sonia/scm/api/v2/resources/IndexResourceTest.java

@@ -0,0 +1,44 @@
+package sonia.scm.api.v2.resources;
+
+import com.github.sdorra.shiro.ShiroRule;
+import com.github.sdorra.shiro.SubjectAware;
+import org.assertj.core.api.Assertions;
+import org.junit.Rule;
+import org.junit.Test;
+
+import java.net.URI;
+import java.util.Optional;
+
+@SubjectAware(configuration = "classpath:sonia/scm/shiro-001.ini")
+public class IndexResourceTest {
+
+  @Rule
+  public final ShiroRule shiroRule = new ShiroRule();
+
+  private final IndexDtoGenerator indexDtoGenerator = new IndexDtoGenerator(ResourceLinksMock.createMock(URI.create("/")));
+  private final IndexResource indexResource = new IndexResource(indexDtoGenerator);
+
+  @Test
+  public void shouldRenderLoginUrlsForUnauthenticatedRequest() {
+    IndexDto index = indexResource.getIndex();
+
+    Assertions.assertThat(index.getLinks().getLinkBy("formLogin")).matches(Optional::isPresent);
+    Assertions.assertThat(index.getLinks().getLinkBy("jsonLogin")).matches(Optional::isPresent);
+  }
+
+  @Test
+  @SubjectAware(username = "trillian", password = "secret")
+  public void shouldRenderMeUrlForAuthenticatedRequest() {
+    IndexDto index = indexResource.getIndex();
+
+    Assertions.assertThat(index.getLinks().getLinkBy("me")).matches(Optional::isPresent);
+  }
+
+  @Test
+  @SubjectAware(username = "trillian", password = "secret")
+  public void shouldRenderLogoutUrlForAuthenticatedRequest() {
+    IndexDto index = indexResource.getIndex();
+
+    Assertions.assertThat(index.getLinks().getLinkBy("logout")).matches(Optional::isPresent);
+  }
+}

scm-webapp/src/test/java/sonia/scm/api/v2/resources/ResourceLinksMock.java

@@ -34,6 +34,7 @@ public class ResourceLinksMock {
     when(resourceLinks.repositoryTypeCollection()).thenReturn(new ResourceLinks.RepositoryTypeCollectionLinks(uriInfo));
     when(resourceLinks.uiPluginCollection()).thenReturn(new ResourceLinks.UIPluginCollectionLinks(uriInfo));
     when(resourceLinks.uiPlugin()).thenReturn(new ResourceLinks.UIPluginLinks(uriInfo));
+    when(resourceLinks.authentication()).thenReturn(new ResourceLinks.AuthenticationLinks(uriInfo));
 
     return resourceLinks;
   }