feat: implement WebADIS authentication and add medianumber retrieval functionality

src/backend/webadis.py

@@ -0,0 +1,35 @@
+from playwright.sync_api import sync_playwright
+
+
+def get_book_medianr(signature: str, semesterapparat_nr: int, auth: tuple) -> str:
+    with sync_playwright() as playwright:
+        browser = playwright.chromium.launch(headless=True)
+        context = browser.new_context()
+        page = context.new_page()
+        page.goto(
+            "https://bsz.ibs-bw.de:22998/aDISWeb/app?service=direct/0/Home/$DirectLink&sp=SDAP42"
+        )
+        page.get_by_role("textbox", name="Benutzer").fill(auth[0])
+        page.get_by_role("textbox", name="Benutzer").press("Tab")
+        page.get_by_role("textbox", name="Kennwort").fill(auth[1])
+        page.get_by_role("textbox", name="Kennwort").press("Enter")
+        page.get_by_role("button", name="Katalog").click()
+        page.get_by_role("textbox", name="Signatur").click()
+        page.get_by_role("textbox", name="Signatur").fill(signature)
+        page.get_by_role("textbox", name="Signatur").press("Enter")
+        book_list = page.locator("iframe").content_frame.get_by_role(
+            "cell", name="Bibliothek der Pädagogischen"
+        )
+        # this will always find one result, we need to split the resulting text based on the entries that start with "* "
+        book_entries = book_list.inner_text().split("\n")
+        books = []
+        for entry in book_entries:
+            if entry.startswith("* "):
+                books.append(entry)
+        for book in books:
+            if f"Semesterapparat: {semesterapparat_nr}" in book:
+                return book.split("* ")[1].split(":")[0]
+
+        # ---------------------
+        context.close()
+        browser.close()