fixes

src/main/java/com/crowdin/cli/client/CrowdinProjectClient.java

@@ -20,7 +20,10 @@
 import com.crowdin.client.stringcomments.model.StringComment;
 import com.crowdin.client.translations.model.*;
 import com.crowdin.client.translationstatus.model.LanguageProgress;
+import lombok.SneakyThrows;
 import org.apache.commons.lang3.StringUtils;
+import org.json.JSONArray;
+import org.json.JSONObject;
 
 import java.io.InputStream;
 import java.net.URL;
@@ -551,4 +554,17 @@ public void installApplication(String url) {
         req.setUrl(url);
         executeRequest(() -> this.client.getApplicationsApi().installApplication(req));
     }
+
+    @Override
+    @SneakyThrows
+    public Optional<String> findManifestUrl(String id) {
+        var url = new URL("https://developer.app.crowdin.net/items/Item?filter={\"slug\":{\"_eq\":\"" + id + "\"}}&fields=manifest");
+        var res = new String(url.openStream().readAllBytes());
+        JSONObject json = new JSONObject(res);
+        var apps = (JSONArray) json.get("data");
+        if (apps.isEmpty()) {
+            return Optional.empty();
+        }
+        return Optional.ofNullable(JSONObject.class.cast(apps.get(0)).get("manifest").toString());
+    }
 }

src/main/java/com/crowdin/cli/client/ProjectClient.java

@@ -19,6 +19,7 @@
 import java.io.InputStream;
 import java.net.URL;
 import java.util.List;
+import java.util.Optional;
 
 public interface ProjectClient extends Client {
 
@@ -137,4 +138,6 @@ default CrowdinProjectFull downloadFullProject() {
     void uninstallApplication(String id, boolean force);
 
     void installApplication(String url);
+
+    Optional<String> findManifestUrl(String id);
 }

src/main/java/com/crowdin/cli/commands/actions/AppInstallAction.java

@@ -3,6 +3,7 @@
 import com.crowdin.cli.client.ProjectClient;
 import com.crowdin.cli.commands.NewAction;
 import com.crowdin.cli.commands.Outputter;
+import com.crowdin.cli.commands.picocli.ExitCodeExceptionMapper;
 import com.crowdin.cli.properties.ProjectProperties;
 import com.crowdin.cli.utils.console.ExecutionStatus;
 import lombok.RequiredArgsConstructor;
@@ -16,12 +17,11 @@ class AppInstallAction implements NewAction<ProjectProperties, ProjectClient> {
 
     @Override
     public void act(Outputter out, ProjectProperties pb, ProjectClient client) {
-        client.installApplication(this.findManifestUrl(id));
+        var manifestUrl = client.findManifestUrl(id);
+        if (manifestUrl.isEmpty()) {
+            throw new ExitCodeExceptionMapper.NotFoundException(String.format(RESOURCE_BUNDLE.getString("error.application_not_found"), this.id));
+        }
+        client.installApplication(manifestUrl.get());
         out.println(ExecutionStatus.OK.withIcon(String.format(RESOURCE_BUNDLE.getString("message.application.install"), id)));
     }
-
-    private String findManifestUrl(String id) {
-        //TODO fix me
-        return id;
-    }
 }

src/main/resources/messages/messages.properties

@@ -540,6 +540,7 @@ error.file_not_exists=Project doesn't contain the '%s' file
 error.file_required=The '--file' parameter is required for this type of project
 error.dir_not_exists=Project doesn't contain the '%s' directory
 error.branch_not_exists=Project doesn't contain the '%s' branch
+error.application_not_found=Application with identifier '%s' doesn't exist in Crowdin Store
 error.source_string_no_edit=Specify some parameters to edit the string
 error.branch_no_edit=Specify some parameters to edit the branch
 error.unexpected_response=Unexpected response from %s: %s

src/test/java/com/crowdin/cli/commands/actions/AppInstallActionTest.java

@@ -0,0 +1,50 @@
+package com.crowdin.cli.commands.actions;
+
+import com.crowdin.cli.client.ProjectClient;
+import com.crowdin.cli.commands.NewAction;
+import com.crowdin.cli.commands.Outputter;
+import com.crowdin.cli.commands.picocli.ExitCodeExceptionMapper;
+import com.crowdin.cli.properties.ProjectProperties;
+import com.crowdin.cli.properties.PropertiesWithFiles;
+import org.junit.jupiter.api.Test;
+
+import java.util.Optional;
+
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.mockito.Mockito.*;
+
+public class AppInstallActionTest {
+
+    Outputter out = Outputter.getDefault();
+    PropertiesWithFiles pb;
+
+    ProjectClient clientMock = mock(ProjectClient.class);
+    NewAction<ProjectProperties, ProjectClient> action;
+
+    @Test
+    public void testInstall() {
+        String id = "test";
+        String url = "test.com/manifest.json";
+        when(clientMock.findManifestUrl(id)).thenReturn(Optional.of(url));
+        doNothing().when(clientMock).installApplication(url);
+
+        action = new AppInstallAction(id);
+        action.act(out, pb, clientMock);
+
+        verify(clientMock).findManifestUrl(id);
+        verify(clientMock).installApplication(url);
+        verifyNoMoreInteractions(clientMock);
+    }
+
+    @Test
+    public void testInstallFailed() {
+        String id = "test";
+        when(clientMock.findManifestUrl(id)).thenReturn(Optional.empty());
+
+        action = new AppInstallAction(id);
+        assertThrows(ExitCodeExceptionMapper.NotFoundException.class, () -> action.act(out, pb, clientMock));
+
+        verify(clientMock).findManifestUrl(id);
+        verifyNoMoreInteractions(clientMock);
+    }
+}