feat(client,server): support problem skeletons (#517)

judgels-backends/judgels-server-api/src/main/java/judgels/jerahmeel/api/chapter/problem/programming/ChapterProblemWorksheet.java

@@ -1,14 +1,17 @@
 package judgels.jerahmeel.api.chapter.problem.programming;
 
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import java.util.Set;
 import judgels.jerahmeel.api.problem.ProblemProgress;
+import judgels.sandalphon.api.problem.programming.ProblemSkeleton;
 import judgels.sandalphon.api.problem.programming.ProblemWorksheet;
 import org.immutables.value.Value;
 
 @Value.Immutable
 @JsonDeserialize(as = ImmutableChapterProblemWorksheet.class)
 public interface ChapterProblemWorksheet extends judgels.jerahmeel.api.chapter.problem.ChapterProblemWorksheet  {
     ProblemWorksheet getWorksheet();
+    Set<ProblemSkeleton> getSkeletons();
     ProblemProgress getProgress();
 
     class Builder extends ImmutableChapterProblemWorksheet.Builder{}

judgels-backends/judgels-server-api/src/main/java/judgels/sandalphon/api/problem/programming/ProblemSkeleton.java

@@ -0,0 +1,14 @@
+package judgels.sandalphon.api.problem.programming;
+
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import java.util.Set;
+import org.immutables.value.Value;
+
+@Value.Immutable
+@JsonDeserialize(as = ImmutableProblemSkeleton.class)
+public interface ProblemSkeleton {
+    Set<String> getLanguages();
+    byte[] getContent();
+
+    class Builder extends ImmutableProblemSkeleton.Builder {}
+}

judgels-backends/judgels-server-app/src/main/java/judgels/jerahmeel/chapter/problem/ChapterProblemResource.java

@@ -144,6 +144,7 @@ public ChapterProblemWorksheet getProblemWorksheet(
                             .from(sandalphonClient.getProgrammingProblemWorksheet(req, uriInfo, problemJid, language))
                             .reasonNotAllowedToSubmit(reasonNotAllowedToSubmit)
                             .build())
+                    .skeletons(sandalphonClient.getProgrammingProblemSkeletons(problemJid))
                     .progress(statsStore.getProblemProgressesMap(actorJid, Set.of(problemJid)).get(problemJid))
                     .build();
         } else {

judgels-backends/judgels-server-app/src/main/java/judgels/sandalphon/SandalphonClient.java

@@ -31,6 +31,7 @@
 import judgels.sandalphon.api.problem.bundle.Item;
 import judgels.sandalphon.api.problem.bundle.ItemConfig;
 import judgels.sandalphon.api.problem.programming.ProblemLimits;
+import judgels.sandalphon.api.problem.programming.ProblemSkeleton;
 import judgels.sandalphon.api.problem.programming.ProblemSubmissionConfig;
 import judgels.sandalphon.lesson.LessonStore;
 import judgels.sandalphon.lesson.statement.LessonStatementStore;
@@ -164,6 +165,10 @@ public judgels.sandalphon.api.problem.programming.ProblemWorksheet getProgrammin
                 .build();
     }
 
+    public Set<ProblemSkeleton> getProgrammingProblemSkeletons(String problemJid) {
+        return problemStatementStore.getSkeletons(null, problemJid);
+    }
+
     public judgels.sandalphon.api.problem.bundle.ProblemWorksheet getBundleProblemWorksheet(
             HttpServletRequest req,
             UriInfo uriInfo,

judgels-backends/judgels-server-app/src/main/java/judgels/sandalphon/problem/base/statement/ProblemStatementStore.java

@@ -6,20 +6,24 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.nio.file.Path;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.stream.Collectors;
 import javax.inject.Inject;
 import judgels.fs.FileInfo;
 import judgels.fs.FileSystem;
+import judgels.gabriel.languages.GradingLanguageRegistry;
 import judgels.sandalphon.api.problem.ProblemStatement;
 import judgels.sandalphon.api.problem.ProblemType;
+import judgels.sandalphon.api.problem.programming.ProblemSkeleton;
 import judgels.sandalphon.problem.base.BaseProblemStore;
 import judgels.sandalphon.problem.base.ProblemFs;
 import judgels.sandalphon.problem.bundle.statement.BundleProblemStatementUtils;
 import judgels.sandalphon.problem.programming.statement.ProgrammingProblemStatementUtils;
 import judgels.sandalphon.resource.StatementLanguageStatus;
+import org.apache.commons.io.FilenameUtils;
 
 public class ProblemStatementStore extends BaseProblemStore {
     @Inject
@@ -150,6 +154,29 @@ public String getStatementMediaFileURL(String userJid, String problemJid, String
         return problemFs.getPublicFileUrl(mediaFilePath);
     }
 
+    public Set<ProblemSkeleton> getSkeletons(String userJid, String problemJid) {
+        Set<ProblemSkeleton> skeletons = new HashSet<>();
+        for (FileInfo file : getStatementMediaFiles(null, problemJid)) {
+            if (file.getName().toLowerCase().startsWith("skeleton.")) {
+                Path mediaFilePath = getStatementMediaDirPath(userJid, problemJid).resolve(file.getName());
+                String extension = FilenameUtils.getExtension(file.getName());
+
+                Set<String> languages = new HashSet<>();
+                for (String language : GradingLanguageRegistry.getInstance().getLanguages().keySet()) {
+                    if (GradingLanguageRegistry.getInstance().get(language).getAllowedExtensions().contains(extension)) {
+                        languages.add(language);
+                    }
+                }
+
+                skeletons.add(new ProblemSkeleton.Builder()
+                        .languages(languages)
+                        .content(problemFs.readByteArrayFromFile(mediaFilePath))
+                        .build());
+            }
+        }
+        return skeletons;
+    }
+
     private Path getStatementsDirPath(String userJid, String problemJid) {
         return getRootDirPath(userJid, problemJid).resolve("statements");
     }

judgels-client/src/components/ProblemWorksheetCard/Programming/ProblemSubmissionEditor/ProblemSubmissionEditor.jsx

@@ -11,6 +11,7 @@ import { getAllowedGradingLanguages, gradingLanguageNamesMap } from '../../../..
 import './ProblemSubmissionEditor.scss';
 
 export function ProblemSubmissionEditor({
+  skeletons,
   config: { sourceKeys, gradingEngine, gradingLanguageRestriction },
   onSubmit,
   reasonNotAllowedToSubmit,
@@ -62,6 +63,12 @@ export function ProblemSubmissionEditor({
       gradingLanguage: defaultGradingLanguage,
     };
 
+    (skeletons || []).forEach(skeleton => {
+      if (skeleton.languages.indexOf(defaultGradingLanguage) >= 0) {
+        initialValues.editor = atob(skeleton.content);
+      }
+    });
+
     return (
       <Form onSubmit={onSubmitEditor} initialValues={initialValues}>
         {({ values, handleSubmit, submitting }) => (

judgels-client/src/routes/courses/courses/single/chapters/single/problems/single/Programming/ChapterProblemPage.test.jsx

@@ -21,6 +21,7 @@ describe('ChapterProblemProgrammingPage', () => {
       },
       defaultLanguage: 'id',
       languages: ['en', 'id'],
+      skeletons: [],
       worksheet: {
         statement: {
           title: 'Problem',

judgels-client/src/routes/courses/courses/single/chapters/single/problems/single/Programming/ChapterProblemWorkspacePage/ChapterProblemWorkspacePage.jsx

@@ -10,14 +10,15 @@ import * as chapterProblemSubmissionActions from '../submissions/modules/chapter
 import * as webPrefsActions from '../../../../../../../../../../modules/webPrefs/webPrefsActions';
 
 function ChapterProblemWorkspacePage({
-  worksheet: { problem, worksheet },
+  worksheet,
   course,
   chapter,
   gradingLanguage,
   onCreateSubmission,
   onUpdateGradingLanguage,
 }) {
-  const { submissionConfig, reasonNotAllowedToSubmit } = worksheet;
+  const { submissionConfig, reasonNotAllowedToSubmit } = worksheet.worksheet;
+  const { problem, skeletons } = worksheet;
 
   const createSubmission = async data => {
     onUpdateGradingLanguage(data.gradingLanguage);
@@ -27,7 +28,7 @@ function ChapterProblemWorkspacePage({
     sendGAEvent({
       category: 'Courses',
       action: 'Submit problem',
-      label: chapter.name + ': ' + problem.alis,
+      label: chapter.name + ': ' + problem.alias,
     });
     if (getGradingLanguageFamily(data.gradingLanguage)) {
       sendGAEvent({
@@ -42,6 +43,7 @@ function ChapterProblemWorkspacePage({
 
   return (
     <ProblemSubmissionEditor
+      skeletons={skeletons}
       config={submissionConfig}
       onSubmit={createSubmission}
       reasonNotAllowedToSubmit={reasonNotAllowedToSubmit}