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

Feat/leerpad object routes
This commit is contained in:
Gabriellvl 2025-03-02 12:33:53 +01:00 committed by GitHub
commit a0c9d8ffc1
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14 changed files with 697 additions and 26 deletions

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@ -14,10 +14,12 @@
"test:unit": "vitest"
},
"dependencies": {
"@mikro-orm/core": "6.4.6",
"@mikro-orm/postgresql": "6.4.6",
"@mikro-orm/core": "^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",

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@ -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();

10
backend/src/config.ts Normal file
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@ -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';

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@ -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' });
}
}

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@ -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' });
}
}

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@ -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' });
}
}

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@ -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;
}

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@ -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;

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@ -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;

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@ -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;

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@ -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[];
}

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@ -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 ?? [];
}

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@ -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;
}
}

167
package-lock.json generated
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@ -32,10 +32,13 @@
"name": "dwengo-1-backend",
"version": "0.0.1",
"dependencies": {
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"@mikro-orm/postgresql": "6.4.6",
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"@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",
"dotenv": "^16.4.7",
"express": "^5.0.1",
"uuid": "^11.1.0",
@ -3391,9 +3394,19 @@
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"dev": true,
"license": "MIT"
},
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}
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@ -3437,6 +3450,12 @@
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}
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},
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"resolved": "https://registry.npmjs.org/bl/-/bl-4.1.0.tgz",
@ -3884,7 +3903,6 @@
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"delayed-stream": "~1.0.0"
@ -4180,7 +4198,6 @@
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@ -4453,7 +4470,6 @@
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@ -5212,6 +5228,26 @@
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"funding": [
{
"type": "individual",
"url": "https://github.com/sponsors/RubenVerborgh"
}
],
"license": "MIT",
"engines": {
"node": ">=4.0"
},
"peerDependenciesMeta": {
"debug": {
"optional": true
}
}
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@ -5233,7 +5269,6 @@
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