Add a function to get lectures from Artemis

app/content_service/get_lecture_from_artemis.py

@@ -0,0 +1,21 @@
+import requests
+import tempfile
+
+DOWNLOAD_BUFFER_SIZE = 8 * 1024
+
+
+def download_lecture_pdf(base_url: str, unit_id: int) -> tempfile.NamedTemporaryFile:
+    """
+    Download a single lecture unit from Artemis
+    """
+    artemis_url = f"{base_url}/api/v1/public/pyris/data/lecture-units/{unit_id}/pdf"
+    response = requests.get(artemis_url, stream=True)
+    if response.status_code != 200:
+        print(f"Failed to download the file. Status code: {response.status_code}")
+        raise ConnectionError
+
+    temp_file = tempfile.NamedTemporaryFile()
+    for chunk in response.iter_content(chunk_size=DOWNLOAD_BUFFER_SIZE):
+        if chunk:
+            temp_file.write(chunk)
+    return temp_file