Merge pull request #54 from SELab-2/feat/leerpad-object-routes

Feat/leerpad object routes

backend/package.json

@@ -14,10 +14,12 @@
         "test:unit": "vitest"
     },
     "dependencies": {
-        "@mikro-orm/core": "6.4.6",
+        "@mikro-orm/core": "^6.4.6",
-        "@mikro-orm/postgresql": "6.4.6",
+        "@mikro-orm/postgresql": "^6.4.6",
+        "@mikro-orm/reflection": "^6.4.6",
+        "@types/js-yaml": "^4.0.9",
+        "axios": "^1.8.1",
         "@mikro-orm/sqlite": "6.4.6",
-        "@mikro-orm/reflection": "6.4.6",
         "dotenv": "^16.4.7",
         "express": "^5.0.1",
         "uuid": "^11.1.0",

backend/src/app.ts

@@ -3,6 +3,8 @@ import { initORM } from './orm.js';
 import { EnvVars, getNumericEnvVar } from './util/envvars.js';
 
 import themeRoutes from './routes/themes.js';
+import learningPathRoutes from './routes/learningPaths.js';
+import learningObjectRoutes from './routes/learningObjects.js';
 
 import studentRouter from './routes/student.js';
 import groupRouter from './routes/group.js';
@@ -32,6 +34,8 @@ app.use('/question', questionRouter);
 app.use('/login', loginRouter);
 
 app.use('/theme', themeRoutes);
+app.use('/learningPath', learningPathRoutes);
+app.use('/learningObject', learningObjectRoutes);
 
 async function startServer() {
     await initORM();

backend/src/config.ts

@@ -0,0 +1,10 @@
+// Can be placed in dotenv but found it redundant
+
+// Import dotenv from "dotenv";
+
+// Load .env file
+// Dotenv.config();
+
+export const DWENGO_API_BASE = 'https://dwengo.org/backend/api';
+
+export const FALLBACK_LANG = 'nl';

backend/src/controllers/learningObjects.ts

@@ -0,0 +1,60 @@
+import { Request, Response } from 'express';
+import {
+    getLearningObjectById,
+    getLearningObjectIdsFromPath,
+    getLearningObjectsFromPath,
+} from '../services/learningObjects.js';
+import { FALLBACK_LANG } from '../config.js';
+import { FilteredLearningObject } from '../interfaces/learningPath';
+
+export async function getAllLearningObjects(
+    req: Request,
+    res: Response
+): Promise<void> {
+    try {
+        const hruid = req.query.hruid as string;
+        const full = req.query.full === 'true';
+        const language = (req.query.language as string) || FALLBACK_LANG;
+
+        if (!hruid) {
+            res.status(400).json({ error: 'HRUID query is required.' });
+            return;
+        }
+
+        let learningObjects: FilteredLearningObject[] | string[];
+        if (full) {
+            learningObjects = await getLearningObjectsFromPath(hruid, language);
+        } else {
+            learningObjects = await getLearningObjectIdsFromPath(
+                hruid,
+                language
+            );
+        }
+
+        res.json(learningObjects);
+    } catch (error) {
+        console.error('Error fetching learning objects:', error);
+        res.status(500).json({ error: 'Internal server error' });
+    }
+}
+
+export async function getLearningObject(
+    req: Request,
+    res: Response
+): Promise<void> {
+    try {
+        const { hruid } = req.params;
+        const language = (req.query.language as string) || FALLBACK_LANG;
+
+        if (!hruid) {
+            res.status(400).json({ error: 'HRUID parameter is required.' });
+            return;
+        }
+
+        const learningObject = await getLearningObjectById(hruid, language);
+        res.json(learningObject);
+    } catch (error) {
+        console.error('Error fetching learning object:', error);
+        res.status(500).json({ error: 'Internal server error' });
+    }
+}

backend/src/controllers/learningPaths.ts

@@ -0,0 +1,62 @@
+import { Request, Response } from 'express';
+import { themes } from '../data/themes.js';
+import { FALLBACK_LANG } from '../config.js';
+import {
+    fetchLearningPaths,
+    searchLearningPaths,
+} from '../services/learningPaths.js';
+/**
+ * Fetch learning paths based on query parameters.
+ */
+export async function getLearningPaths(
+    req: Request,
+    res: Response
+): Promise<void> {
+    try {
+        const hruids = req.query.hruid;
+        const themeKey = req.query.theme as string;
+        const searchQuery = req.query.search as string;
+        const language = (req.query.language as string) || FALLBACK_LANG;
+
+        let hruidList;
+
+        if (hruids) {
+            hruidList = Array.isArray(hruids)
+                ? hruids.map(String)
+                : [String(hruids)];
+        } else if (themeKey) {
+            const theme = themes.find((t) => {
+                return t.title === themeKey;
+            });
+            if (theme) {
+                hruidList = theme.hruids;
+            } else {
+                res.status(404).json({
+                    error: `Theme "${themeKey}" not found.`,
+                });
+                return;
+            }
+        } else if (searchQuery) {
+            const searchResults = await searchLearningPaths(
+                searchQuery,
+                language
+            );
+            res.json(searchResults);
+            return;
+        } else {
+            hruidList = themes.flatMap((theme) => {
+                return theme.hruids;
+            });
+        }
+
+        const learningPaths = await fetchLearningPaths(
+            hruidList,
+            language,
+            `HRUIDs: ${hruidList.join(', ')}`
+        );
+        res.json(learningPaths.data);
+    } catch (error) {
+        console.error('❌ Unexpected error fetching learning paths:', error);
+        res.status(500).json({ error: 'Internal server error' });
+    }
+}

backend/src/controllers/themes.ts

@@ -3,6 +3,7 @@ import path from 'path';
 import yaml from 'js-yaml';
 import { Request, Response } from 'express';
 import { themes } from '../data/themes.js';
+import { FALLBACK_LANG } from '../config.js';
 
 interface Translations {
     curricula_page: {
@@ -10,9 +11,6 @@ interface Translations {
     };
 }
 
-/**
- * Laadt de vertalingen uit een YAML-bestand
- */
 function loadTranslations(language: string): Translations {
     try {
         const filePath = path.join(process.cwd(), '_i18n', `${language}.yml`);
@@ -20,7 +18,7 @@ function loadTranslations(language: string): Translations {
         return yaml.load(yamlFile) as Translations;
     } catch (error) {
         console.error(
-            `Kan vertaling niet laden voor ${language}, fallback naar Nederlands`
+            `Cannot load translation for: ${language}, fallen back to Dutch`
         );
         console.error(error);
         const fallbackPath = path.join(process.cwd(), '_i18n', 'nl.yml');
@@ -28,11 +26,9 @@ function loadTranslations(language: string): Translations {
     }
 }
 
-/**
- * GET /themes → Haalt de lijst met thema's op inclusief vertalingen
- */
 export function getThemes(req: Request, res: Response) {
-    const language = (req.query.language as string)?.toLowerCase() || 'nl';
+    const language =
+        (req.query.language as string)?.toLowerCase() || FALLBACK_LANG;
     const translations = loadTranslations(language);
 
     const themeList = themes.map((theme) => {
@@ -48,9 +44,6 @@ export function getThemes(req: Request, res: Response) {
     res.json(themeList);
 }
 
-/**
- * GET /themes/:theme → Geeft de HRUIDs terug voor een specifiek thema
- */
 export function getThemeByTitle(req: Request, res: Response) {
     const themeKey = req.params.theme;
     const theme = themes.find((t) => {
@@ -60,6 +53,6 @@ export function getThemeByTitle(req: Request, res: Response) {
     if (theme) {
         res.json(theme.hruids);
     } else {
-        res.status(404).json({ error: 'Thema niet gevonden' });
+        res.status(404).json({ error: 'Theme not found' });
     }
 }

backend/src/interfaces/learningPath.ts

@@ -0,0 +1,98 @@
+export interface Transition {
+    default: boolean;
+    _id: string;
+    next: {
+        _id: string;
+        hruid: string;
+        version: number;
+        language: string;
+    };
+}
+
+export interface LearningObjectNode {
+    _id: string;
+    learningobject_hruid: string;
+    version: number;
+    language: string;
+    start_node?: boolean;
+    transitions: Transition[];
+    created_at: string;
+    updatedAt: string;
+}
+
+export interface LearningPath {
+    _id: string;
+    language: string;
+    hruid: string;
+    title: string;
+    description: string;
+    image?: string; // Image might be missing, so it's optional
+    num_nodes: number;
+    num_nodes_left: number;
+    nodes: LearningObjectNode[];
+    keywords: string;
+    target_ages: number[];
+    min_age: number;
+    max_age: number;
+    __order: number;
+}
+
+export interface EducationalGoal {
+    source: string;
+    id: string;
+}
+
+export interface ReturnValue {
+    callback_url: string;
+    callback_schema: Record<string, any>;
+}
+
+export interface LearningObjectMetadata {
+    _id: string;
+    uuid: string;
+    hruid: string;
+    version: number;
+    language: string;
+    title: string;
+    description: string;
+    difficulty: number;
+    estimated_time: number;
+    available: boolean;
+    teacher_exclusive: boolean;
+    educational_goals: EducationalGoal[];
+    keywords: string[];
+    target_ages: number[];
+    content_type: string; // Markdown, image, etc.
+    content_location?: string;
+    skos_concepts?: string[];
+    return_value?: ReturnValue;
+}
+
+export interface FilteredLearningObject {
+    key: string;
+    _id: string;
+    uuid: string;
+    version: number;
+    title: string;
+    htmlUrl: string;
+    language: string;
+    difficulty: number;
+    estimatedTime: number;
+    available: boolean;
+    teacherExclusive: boolean;
+    educationalGoals: EducationalGoal[];
+    keywords: string[];
+    description: string;
+    targetAges: number[];
+    contentType: string;
+    contentLocation?: string;
+    skosConcepts?: string[];
+    returnValue?: ReturnValue;
+}
+
+export interface LearningPathResponse {
+    success: boolean;
+    source: string;
+    data: LearningPath[] | null;
+    message?: string;
+}

backend/src/routes/learningObjects.ts

@@ -0,0 +1,27 @@
+import express from 'express';
+import {
+    getAllLearningObjects,
+    getLearningObject,
+} from '../controllers/learningObjects.js';
+
+const router = express.Router();
+
+// DWENGO learning objects
+
+// Queries: hruid(path), full, language
+// Route to fetch list of learning objects based on hruid of learning path
+
+// Route 1: list of object hruids
+// Example 1: http://localhost:3000/learningObject?hruid=un_artificiele_intelligentie
+
+// Route 2: list of object data
+// Example 2: http://localhost:3000/learningObject?full=true&hruid=un_artificiele_intelligentie
+router.get('/', getAllLearningObjects);
+
+// Parameter: hruid of learning object
+// Query: language
+// Route to fetch data of one learning object based on its hruid
+// Example: http://localhost:3000/learningObject/un_ai7
+router.get('/:hruid', getLearningObject);
+
+export default router;

backend/src/routes/learningPaths.ts

@@ -0,0 +1,27 @@
+import express from 'express';
+import { getLearningPaths } from '../controllers/learningPaths.js';
+
+const router = express.Router();
+
+// DWENGO learning paths
+
+// Route 1: no query
+// Fetch all learning paths
+// Example 1: http://localhost:3000/learningPath
+
+// Unified route for fetching learning paths
+// Route 2: Query: hruid (list), language
+// Fetch learning paths based on hruid list
+// Example 2: http://localhost:3000/learningPath?hruid=pn_werking&hruid=art1
+
+// Query: search, language
+// Route to fetch learning paths based on a searchterm
+// Example 3: http://localhost:3000/learningPath?search=robot
+
+// Query: theme, anguage
+// Route to fetch learning paths based on a theme
+// Example: http://localhost:3000/learningPath?theme=kiks
+
+router.get('/', getLearningPaths);
+
+export default router;

backend/src/routes/themes.ts

@@ -3,7 +3,12 @@ import { getThemes, getThemeByTitle } from '../controllers/themes.js';
 
 const router = express.Router();
 
+// Query: language
+//  Route to fetch list of {key, title, description, image} themes in their respective language
 router.get('/', getThemes);
+
+// Arg: theme (key)
+//  Route to fetch list of hruids based on theme
 router.get('/:theme', getThemeByTitle);
 
 export default router;

backend/src/services/learningObjects.ts

@@ -0,0 +1,134 @@
+import { DWENGO_API_BASE } from '../config.js';
+import { fetchWithLogging } from '../util/apiHelper.js';
+import {
+    FilteredLearningObject,
+    LearningObjectMetadata,
+    LearningObjectNode,
+    LearningPathResponse,
+} from '../interfaces/learningPath.js';
+import { fetchLearningPaths } from './learningPaths.js';
+
+function filterData(
+    data: LearningObjectMetadata,
+    htmlUrl: string
+): FilteredLearningObject {
+    return {
+        key: data.hruid, // Hruid learningObject (not path)
+        _id: data._id,
+        uuid: data.uuid,
+        version: data.version,
+        title: data.title,
+        htmlUrl, // Url to fetch html content
+        language: data.language,
+        difficulty: data.difficulty,
+        estimatedTime: data.estimated_time,
+        available: data.available,
+        teacherExclusive: data.teacher_exclusive,
+        educationalGoals: data.educational_goals, // List with learningObjects
+        keywords: data.keywords, // For search
+        description: data.description, // For search (not an actual description)
+        targetAges: data.target_ages,
+        contentType: data.content_type, // Markdown, image, audio, etc.
+        contentLocation: data.content_location, // If content type extern
+        skosConcepts: data.skos_concepts,
+        returnValue: data.return_value, // Callback response information
+    };
+}
+
+/**
+ * Fetches a single learning object by its HRUID
+ */
+export async function getLearningObjectById(
+    hruid: string,
+    language: string
+): Promise<FilteredLearningObject | null> {
+    const metadataUrl = `${DWENGO_API_BASE}/learningObject/getMetadata?hruid=${hruid}&language=${language}`;
+    const metadata = await fetchWithLogging<LearningObjectMetadata>(
+        metadataUrl,
+        `Metadata for Learning Object HRUID "${hruid}" (language ${language})`
+    );
+
+    if (!metadata) {
+        console.error(`⚠️ WARNING: Learning object "${hruid}" not found.`);
+        return null;
+    }
+
+    const htmlUrl = `${DWENGO_API_BASE}/learningObject/getRaw?hruid=${hruid}&language=${language}`;
+    return filterData(metadata, htmlUrl);
+}
+
+/**
+ * Generic function to fetch learning objects (full data or just HRUIDs)
+ */
+async function fetchLearningObjects(
+    hruid: string,
+    full: boolean,
+    language: string
+): Promise<FilteredLearningObject[] | string[]> {
+    try {
+        const learningPathResponse: LearningPathResponse =
+            await fetchLearningPaths(
+                [hruid],
+                language,
+                `Learning path for HRUID "${hruid}"`
+            );
+
+        if (
+            !learningPathResponse.success ||
+            !learningPathResponse.data?.length
+        ) {
+            console.error(
+                `⚠️ WARNING: Learning path "${hruid}" exists but contains no learning objects.`
+            );
+            return [];
+        }
+
+        const nodes: LearningObjectNode[] = learningPathResponse.data[0].nodes;
+
+        if (!full) {
+            return nodes.map((node) => {
+                return node.learningobject_hruid;
+            });
+        }
+
+        return await Promise.all(
+            nodes.map(async (node) => {
+                return getLearningObjectById(
+                    node.learningobject_hruid,
+                    language
+                );
+            })
+        ).then((objects) => {
+            return objects.filter((obj): obj is FilteredLearningObject => {
+                return obj !== null;
+            });
+        });
+    } catch (error) {
+        console.error('❌ Error fetching learning objects:', error);
+        return [];
+    }
+}
+
+/**
+ * Fetch full learning object data (metadata)
+ */
+export async function getLearningObjectsFromPath(
+    hruid: string,
+    language: string
+): Promise<FilteredLearningObject[]> {
+    return (await fetchLearningObjects(
+        hruid,
+        true,
+        language
+    )) as FilteredLearningObject[];
+}
+
+/**
+ * Fetch only learning object HRUIDs
+ */
+export async function getLearningObjectIdsFromPath(
+    hruid: string,
+    language: string
+): Promise<string[]> {
+    return (await fetchLearningObjects(hruid, false, language)) as string[];
+}

backend/src/services/learningPaths.ts

@@ -0,0 +1,61 @@
+import { fetchWithLogging } from '../util/apiHelper.js';
+import { DWENGO_API_BASE } from '../config.js';
+import {
+    LearningPath,
+    LearningPathResponse,
+} from '../interfaces/learningPath.js';
+
+export async function fetchLearningPaths(
+    hruids: string[],
+    language: string,
+    source: string
+): Promise<LearningPathResponse> {
+    if (hruids.length === 0) {
+        return {
+            success: false,
+            source,
+            data: null,
+            message: `No HRUIDs provided for ${source}.`,
+        };
+    }
+
+    const apiUrl = `${DWENGO_API_BASE}/learningPath/getPathsFromIdList`;
+    const params = { pathIdList: JSON.stringify({ hruids }), language };
+
+    const learningPaths = await fetchWithLogging<LearningPath[]>(
+        apiUrl,
+        `Learning paths for ${source}`,
+        params
+    );
+
+    if (!learningPaths || learningPaths.length === 0) {
+        console.error(`⚠️ WARNING: No learning paths found for ${source}.`);
+        return {
+            success: false,
+            source,
+            data: [],
+            message: `No learning paths found for ${source}.`,
+        };
+    }
+
+    return {
+        success: true,
+        source,
+        data: learningPaths,
+    };
+}
+
+export async function searchLearningPaths(
+    query: string,
+    language: string
+): Promise<LearningPath[]> {
+    const apiUrl = `${DWENGO_API_BASE}/learningPath/search`;
+    const params = { all: query, language };
+
+    const searchResults = await fetchWithLogging<LearningPath[]>(
+        apiUrl,
+        `Search learning paths with query "${query}"`,
+        params
+    );
+    return searchResults ?? [];
+}

backend/src/util/apiHelper.ts

@@ -0,0 +1,43 @@
+import axios, { AxiosRequestConfig } from 'axios';
+
+// !!!! when logger is done -> change
+
+/**
+ * Utility function to fetch data from an API endpoint with error handling.
+ * Logs errors but does NOT throw exceptions to keep the system running.
+ *
+ * @param url The API endpoint to fetch from.
+ * @param description A short description of what is being fetched (for logging).
+ * @param params
+ * @returns The response data if successful, or null if an error occurs.
+ */
+export async function fetchWithLogging<T>(
+    url: string,
+    description: string,
+    params?: Record<string, any>
+): Promise<T | null> {
+    try {
+        const config: AxiosRequestConfig = params ? { params } : {};
+
+        const response = await axios.get<T>(url, config);
+        return response.data;
+    } catch (error: any) {
+        if (error.response) {
+            if (error.response.status === 404) {
+                console.error(
+                    `❌ ERROR: ${description} not found (404) at "${url}".`
+                );
+            } else {
+                console.error(
+                    `❌ ERROR: Failed to fetch ${description}. Status: ${error.response.status} - ${error.response.statusText} (URL: "${url}")`
+                );
+            }
+        } else {
+            console.error(
+                `❌ ERROR: Network or unexpected error when fetching ${description}:`,
+                error.message
+            );
+        }
+        return null;
+    }
+}

package-lock.json

@@ -32,10 +32,13 @@
             "name": "dwengo-1-backend",
             "version": "0.0.1",
             "dependencies": {
-                "@mikro-orm/core": "6.4.6",
+                "@mikro-orm/core": "^6.4.6",
-                "@mikro-orm/postgresql": "6.4.6",
+                "@mikro-orm/postgresql": "^6.4.6",
-                "@mikro-orm/reflection": "6.4.6",
+                "@mikro-orm/reflection": "^6.4.6",
+                "@types/js-yaml": "^4.0.9",
+                "axios": "^1.8.1",
                 "@mikro-orm/sqlite": "6.4.6",
+
                 "dotenv": "^16.4.7",
                 "express": "^5.0.1",
                 "uuid": "^11.1.0",
@@ -3391,9 +3394,19 @@
             "version": "0.4.0",
             "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
             "integrity": "sha512-Oei9OH4tRh0YqU3GxhX79dM/mwVgvbZJaSNaRk+bshkj0S5cfHcgYakreBjrHwatXKbz+IoIdYLxrKim2MjW0Q==",
-            "dev": true,
             "license": "MIT"
         },
+        "node_modules/axios": {
+            "version": "1.8.1",
+            "resolved": "https://registry.npmjs.org/axios/-/axios-1.8.1.tgz",
+            "integrity": "sha512-NN+fvwH/kV01dYUQ3PTOZns4LWtWhOFCAhQ/pHb88WQ1hNe5V/dvFwc4VJcDL11LT9xSX0QtsR8sWUuyOuOq7g==",
+            "license": "MIT",
+            "dependencies": {
+                "follow-redirects": "^1.15.6",
+                "form-data": "^4.0.0",
+                "proxy-from-env": "^1.1.0"
+            }
+        },
         "node_modules/balanced-match": {
             "version": "1.0.2",
             "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
@@ -3437,6 +3450,12 @@
                 "url": "https://github.com/sponsors/antfu"
             }
         },
+        "node_modules/bmp-js": {
+            "version": "0.1.0",
+            "resolved": "https://registry.npmjs.org/bmp-js/-/bmp-js-0.1.0.tgz",
+            "integrity": "sha512-vHdS19CnY3hwiNdkaqk93DvjVLfbEcI8mys4UjuWrlX1haDmroo8o4xCzh4wD6DGV6HxRCyauwhHRqMTfERtjw==",
+            "license": "MIT"
+        },
         "node_modules/bl": {
             "version": "4.1.0",
             "resolved": "https://registry.npmjs.org/bl/-/bl-4.1.0.tgz",
@@ -3884,7 +3903,6 @@
             "version": "1.0.8",
             "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
             "integrity": "sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==",
-            "dev": true,
             "license": "MIT",
             "dependencies": {
                 "delayed-stream": "~1.0.0"
@@ -4180,7 +4198,6 @@
             "version": "1.0.0",
             "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
             "integrity": "sha512-ZySD7Nf91aLB0RxL4KGrKHBXl7Eds1DAmEdcoVawXnLD7SDhpNgtuII2aAkg7a7QS41jxPSZ17p4VdGnMHk3MQ==",
-            "dev": true,
             "license": "MIT",
             "engines": {
                 "node": ">=0.4.0"
@@ -4453,7 +4470,6 @@
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+            "license": "MIT",
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     }
 }