Add PortalaAdapter for PADOKA / Sachsen-Anhalt (#2)

Adds a clean-room PortalaAdapter that talks to the eUI/portala framework
behind PADOKA (Landtag Sachsen-Anhalt). Same engine powers Berlin's
PARDOK; the same adapter will serve issue #3 once activated for BE.

Reverse-engineering notes
- The "PADOKA = StarWeb" assumption from issue #1 / dokukratie's st.yml
  is outdated. The Sachsen-Anhalt portal was migrated to the same
  eUI/portala SPA framework Berlin uses. The legacy starweb URL returns
  503; the new entry point is /portal/browse.tt.html.
- Search workflow is two-stage:
  1. POST /portal/browse.tt.json with a JSON action body containing an
     Elasticsearch-style query tree under search.json. Returns a
     report_id plus hit count.
  2. POST /portal/report.tt.html with {report_id, start, chunksize}
     returns the HTML hit list. Each record carries a Perl Data::Dumper
     block in a <pre> tag with the canonical metadata.
- The query schema (sources, search.lines, search.json tree, report
  block) is taken from dokukratie/scrapers/portala.query.json (GPL-3.0)
  — only structure/selectors are reused, no Python code is ported.
- DB id is "lsa.lissh"; the server validates this and rejects unknown
  interfaces with an explicit errormsg.
- PDFs live under /files/drs/wp{N}/drs/d{nr}{xxx}.pdf and are served
  directly without any session cookie.

What the adapter does
- search() builds a date-window query (last ~24 months) for "Antrag"
  document type and returns the most recent hits. The user's free-text
  query is applied as a client-side title/Urheber filter (no fulltext
  search server-side yet — see "Limitations" below).
- Hits are parsed from the Perl record dumps in the report HTML:
  - WEV06.main → title (Perl \x{xx} hex escapes decoded)
  - WEV32.5   → relative PDF path
  - WEV32.main → "Antrag <Urheber> <DD.MM.YYYY> Drucksache <b>X/YYYY</b>"
- Fraktion strings are normalised to canonical codes (CDU, SPD, GRÜNE,
  FDP, AfD, LINKE, Landesregierung).
- get_document() looks up a single Drucksache by re-running the search.
- download_text() fetches the PDF and extracts text via PyMuPDF.
- bundeslaender.py: LSA's doku_system corrected from "StarWeb" to
  "PARDOK", anmerkung updated with the migration story.

Limitations (deliberate, MVP)
- No server-side full-text search. The portala framework's sf index
  names for LSA full-text content are not yet known; tree mutations
  with sf=alAB return 0 hits. Client-side filter is "good enough" for
  the next ~24 months of Anträge (≈few hundred per WP).
- LSA is still aktiv=False in bundeslaender.py — the adapter is dormant
  in production until issue #2's wahlprogramm ingest and frontend
  activation land.

Verified live against padoka.landtag.sachsen-anhalt.de:
- search(query="", limit=5) returned 5 current Anträge from März 2026
  (LINKE + GRÜNE) with correct dates, fractions, titles and PDF URLs.
- download_text("8/6790") returned 5051 chars of real Antragstext
  ("ICE-Halt für Salzwedel dauerhaft erhalten").

Refs #2.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/bundeslaender.py

@@ -298,14 +298,16 @@ BUNDESLAENDER: dict[str, Bundesland] = {
         naechste_wahl="2026-09-06",
         regierungsfraktionen=["CDU", "SPD", "FDP"],
         landtagsfraktionen=["CDU", "AfD", "LINKE", "SPD", "GRÜNE", "FDP"],
-        doku_system="StarWeb",
+        doku_system="PARDOK",
         doku_base_url="https://padoka.landtag.sachsen-anhalt.de",
         drucksache_format="8/1234",
         dokukratie_scraper="st",
         anmerkung=(
             "ISO-Code wäre ST; LSA ist im politischen Sprachgebrauch dominant. "
             "Sven Schulze (CDU) seit 28.01.2026 MP nach Rücktritt Haseloff. "
-            "PADOKA = Parlamentsdokumentationssystem auf StarWeb-6.0.01-Basis."
+            "PADOKA wurde von StarWeb auf das portala/eUI-Framework migriert "
+            "(gleiche Engine wie Berlin/PARDOK). dokukratie's st.yml ist veraltet. "
+            "Suche läuft via POST /portal/browse.tt.json + report.tt.html."
         ),
     ),
     "SH": Bundesland(

app/parlamente.py

@@ -305,21 +305,343 @@ class NRWAdapter(ParlamentAdapter):
                 return None
 
 
+class PortalaAdapter(ParlamentAdapter):
+    """Adapter for portala/eUI-based parliament documentation systems.
+
+    Used by parliaments running the proprietary "esearch" / portala framework
+    (originally developed for STAR/StarFinder backends, now wrapped in a
+    Single-Page App with Template Toolkit on the server side):
+
+    - **LSA** (Sachsen-Anhalt) — PADOKA at ``padoka.landtag.sachsen-anhalt.de``
+    - **BE** (Berlin) — PARDOK at ``pardok.parlament-berlin.de`` (future)
+
+    The search workflow is two-stage:
+
+    1. ``POST /portal/browse.tt.json`` with a complex JSON ``action`` body
+       that contains an Elasticsearch-style query tree under
+       ``search.json``. The server returns a ``report_id`` plus hit count.
+    2. ``POST /portal/report.tt.html`` with ``{report_id, start, chunksize}``
+       to fetch the HTML hit list. Each hit carries a Perl Data::Dumper
+       block in a ``<pre>`` tag with the canonical metadata.
+
+    The query body schema was reverse-engineered from
+    https://github.com/okfde/dokukratie/blob/main/dokukratie/scrapers/portala.query.json
+    (GPL-3.0 — only structure/selectors are reused, not Python code).
+
+    Full-text search is **not** implemented in the MVP: the adapter
+    returns the most recent ``Anträge`` of the current Wahlperiode in the
+    given date window, and the search query is applied as a client-side
+    title/Urheber filter. The portala server-side full-text path requires
+    LSA-specific ``sf`` index names that are not yet known.
+    """
+
+    bundesland = "LSA"
+    name = "Landtag von Sachsen-Anhalt (PADOKA)"
+    base_url = "https://padoka.landtag.sachsen-anhalt.de"
+    db_id = "lsa.lissh"
+    wahlperiode = 8
+
+    # Reverse-engineered "WEV*" Perl record fields used in the hit-list dumps:
+    # WEV06.main = title
+    # WEV32.5    = relative PDF path
+    # WEV32.main = "Antrag <Urheber> <DD.MM.YYYY> Drucksache <b>X/YYYY</b> ..."
+    _RE_TITLE = re.compile(r"'WEV06'\s*=>\s*\[\s*\{\s*'main'\s*=>\s*[\"']([^\"']+)[\"']")
+    _RE_PDF = re.compile(r"'5'\s*=>\s*'([^']*\.pdf)'")
+    _RE_DRUCKSACHE = re.compile(r"Drucksache\s*<b>(\d+/\d+)</b>")
+    _RE_URHEBER_DATUM = re.compile(
+        r"'WEV32'\s*=>\s*\[\s*\{[^}]*'main'\s*=>\s*[\"']Antrag\s+(.+?)\s+(\d{1,2}\.\d{1,2}\.\d{4})\s+Drucksache",
+    )
+    _RE_PRE_BLOCK = re.compile(r'<pre>\$VAR1 = (.*?)</pre>', re.DOTALL)
+
+    @staticmethod
+    def _decode_perl_hex(s: str) -> str:
+        """Decode \\x{abcd} escape sequences from Perl Data::Dumper output."""
+        return re.sub(r'\\x\{([0-9a-f]+)\}', lambda m: chr(int(m.group(1), 16)), s)
+
+    @staticmethod
+    def _normalize_fraktion(urheber: str) -> list[str]:
+        """Map Urheber-String to canonical fraction codes."""
+        u = urheber.upper()
+        out = []
+        if "BÜNDNIS 90" in u or "GRÜNE" in u or "GRUENE" in u:
+            out.append("GRÜNE")
+        if u.startswith("CDU") or " CDU " in u or u.endswith(" CDU"):
+            out.append("CDU")
+        if "SPD" in u:
+            out.append("SPD")
+        if "FDP" in u:
+            out.append("FDP")
+        if "AFD" in u:
+            out.append("AfD")
+        if "LINKE" in u or "DIE LINKE" in u:
+            out.append("LINKE")
+        if "LANDESREGIERUNG" in u or "MINISTER" in u or "STAATSKANZLEI" in u:
+            out.append("Landesregierung")
+        return out
+
+    def _build_search_body(
+        self,
+        wahlperiode: int,
+        start_date: str,
+        end_date: str,
+        document_type: str = "Antrag",
+    ) -> dict:
+        """Build the action JSON body for browse.tt.json.
+
+        The schema is taken 1:1 from dokukratie's portala.query.json template
+        and only differs in the data source (lsa.lissh) and the variable
+        substitutions.
+        """
+        return {
+            "action": "SearchAndDisplay",
+            "sources": [self.db_id],
+            "report": {
+                "rhl": "main",
+                "rhlmode": "add",
+                "format": "generic1-full",
+                "mime": "html",
+                "sort": "WEVSO1/D WEVSO2 WEVSO3",
+            },
+            "search": {
+                "lines": {
+                    "2": str(wahlperiode),
+                    "3": document_type,
+                    "4": "D",
+                    "10": start_date,
+                    "11": end_date,
+                    "20.1": "alWEBBI",
+                    "20.2": "alWEBBI",
+                    "20.3": "alWEBBI",
+                    "90.1": "AND",
+                    "90.2": "AND",
+                    "90.3": "AND",
+                },
+                "serverrecordname": "sr_generic1",
+                "parsed": (
+                    f"((/WP {wahlperiode}) AND "
+                    f"(/ETYPF,ETYP2F,DTYPF,DTYP2F,1VTYPF (\"{document_type}\")) "
+                    f"AND (/DART,DARTS (\"D\")) AND "
+                    f"(DAT,DDAT,SDAT= {start_date} THRU {end_date})) AND TYP=DOKDBE"
+                ),
+                "sref": (
+                    f"((/WP {wahlperiode}) AND "
+                    f"(/ETYPF,ETYP2F,DTYPF,DTYP2F,1VTYPF (\"{document_type}\")) "
+                    f"AND (/DART,DARTS (\"D\")) AND "
+                    f"(DAT,DDAT,SDAT= {start_date} THRU {end_date})) AND TYP=DOKDBE"
+                ),
+                "json": [{
+                    "tn": "and",
+                    "num": 1,
+                    "terms": [
+                        {"tn": "term", "t": str(wahlperiode), "idx": 6, "l": 3,
+                         "sf": "WP", "op": "eq", "num": 5},
+                        {"tn": "or", "num": 3, "terms": [
+                            {"tn": "or", "num": 4, "terms": [
+                                {"tn": "term", "t": f'"{document_type}"', "idx": 50,
+                                 "l": 4, "sf": "ETYPF", "op": "eq", "num": 10},
+                                {"tn": "term", "t": f'"{document_type}"', "idx": 50,
+                                 "l": 4, "sf": "ETYP2F", "op": "eq", "num": 11},
+                                {"tn": "term", "t": f'"{document_type}"', "idx": 50,
+                                 "l": 4, "sf": "DTYPF", "op": "eq", "num": 12},
+                                {"tn": "term", "t": f'"{document_type}"', "idx": 50,
+                                 "l": 4, "sf": "DTYP2F", "op": "eq", "num": 13},
+                                {"tn": "term", "t": f'"{document_type}"', "idx": 50,
+                                 "l": 4, "sf": "1VTYPF", "op": "eq", "num": 14},
+                            ]},
+                            {"tn": "or", "num": 15, "terms": [
+                                {"tn": "term", "t": '"D"', "idx": 93, "l": 4,
+                                 "sf": "DART", "op": "eq", "num": 16},
+                                {"tn": "term", "t": '"D"', "idx": 93, "l": 4,
+                                 "sf": "DARTS", "op": "eq", "num": 17},
+                            ]},
+                        ]},
+                        {"tn": "or", "num": 18, "terms": [
+                            {"tn": "or", "num": 19, "terms": [
+                                {"tn": "trange", "sf": "DAT", "op": "eq", "num": 20,
+                                 "idx": 119, "l": 3, "p1": start_date, "t1": start_date,
+                                 "p2": end_date, "t2": end_date,
+                                 "t": f"{start_date} THRU {end_date}"},
+                                {"tn": "trange", "sf": "DDAT", "op": "eq", "num": 21,
+                                 "idx": 119, "l": 3, "p1": start_date, "t1": start_date,
+                                 "p2": end_date, "t2": end_date,
+                                 "t": f"{start_date} THRU {end_date}"},
+                            ]},
+                            {"tn": "trange", "sf": "SDAT", "op": "eq", "num": 22,
+                             "idx": 119, "l": 3, "p1": start_date, "t1": start_date,
+                             "p2": end_date, "t2": end_date,
+                             "t": f"{start_date} THRU {end_date}"},
+                        ]},
+                        {"tn": "term", "t": "DOKDBE", "idx": 156, "l": 1,
+                         "sf": "TYP", "op": "eq", "num": 23},
+                    ],
+                }],
+            },
+            "dataSet": "1",
+        }
+
+    def _parse_hit_list_html(self, html: str, query_filter: str = "") -> list[Drucksache]:
+        """Extract Drucksachen from a report.tt.html response."""
+        results: list[Drucksache] = []
+        for pre in self._RE_PRE_BLOCK.findall(html):
+            m_ds = self._RE_DRUCKSACHE.search(pre)
+            if not m_ds:
+                continue
+            drucksache = m_ds.group(1)
+
+            m_t = self._RE_TITLE.search(pre)
+            title = self._decode_perl_hex(m_t.group(1)) if m_t else f"Drucksache {drucksache}"
+
+            m_pdf = self._RE_PDF.search(pre)
+            pdf_rel = m_pdf.group(1) if m_pdf else ""
+            pdf_url = f"{self.base_url}/files/{pdf_rel}" if pdf_rel else ""
+
+            m_w32 = self._RE_URHEBER_DATUM.search(pre)
+            urheber = self._decode_perl_hex(m_w32.group(1).strip()) if m_w32 else ""
+            datum_de = m_w32.group(2) if m_w32 else ""
+            # DD.MM.YYYY -> ISO YYYY-MM-DD
+            datum_iso = ""
+            if datum_de:
+                d, m, y = datum_de.split(".")
+                datum_iso = f"{y}-{m.zfill(2)}-{d.zfill(2)}"
+
+            fraktionen = self._normalize_fraktion(urheber) if urheber else []
+
+            doc = Drucksache(
+                drucksache=drucksache,
+                title=title,
+                fraktionen=fraktionen,
+                datum=datum_iso,
+                link=pdf_url,
+                bundesland=self.bundesland,
+                typ="Antrag",
+            )
+
+            # Client-side title filter (no fulltext search server-side)
+            if query_filter:
+                hay = f"{title} {urheber}".lower()
+                if not all(t in hay for t in query_filter.lower().split()):
+                    continue
+
+            results.append(doc)
+
+        return results
+
+    async def search(self, query: str, limit: int = 20) -> list[Drucksache]:
+        """Search recent Anträge of the current Wahlperiode.
+
+        ``query`` is applied as a client-side title/Urheber filter; the
+        server-side query covers the last ~24 months by default.
+        """
+        from datetime import date, timedelta
+
+        end = date.today()
+        start = end - timedelta(days=730)
+        body = self._build_search_body(
+            wahlperiode=self.wahlperiode,
+            start_date=start.isoformat(),
+            end_date=end.isoformat(),
+            document_type="Antrag",
+        )
+
+        async with httpx.AsyncClient(
+            timeout=30,
+            follow_redirects=True,
+            headers={"User-Agent": "Mozilla/5.0 GWOE-Antragspruefer"},
+        ) as client:
+            try:
+                # Step 1: warm up cookies via the browse page
+                await client.get(f"{self.base_url}/portal/browse.tt.html")
+
+                # Step 2: submit the search action
+                resp = await client.post(
+                    f"{self.base_url}/portal/browse.tt.json",
+                    json=body,
+                    headers={"Referer": f"{self.base_url}/portal/browse.tt.html"},
+                )
+                if resp.status_code != 200:
+                    print(f"PADOKA search HTTP {resp.status_code}")
+                    return []
+
+                data = resp.json()
+                report_id = data.get("report_id")
+                if not report_id:
+                    print(f"PADOKA: no report_id in response: {data}")
+                    return []
+
+                # Step 3: fetch the HTML hit list
+                # Take a generous chunk so client-side filter still has enough
+                chunksize = 100 if query else limit
+                report_resp = await client.post(
+                    f"{self.base_url}/portal/report.tt.html",
+                    json={"report_id": report_id, "start": 0, "chunksize": chunksize},
+                    headers={"Referer": f"{self.base_url}/portal/browse.tt.html"},
+                )
+                if report_resp.status_code != 200:
+                    print(f"PADOKA report HTTP {report_resp.status_code}")
+                    return []
+
+                results = self._parse_hit_list_html(report_resp.text, query_filter=query)
+                return results[:limit]
+
+            except Exception as e:
+                print(f"PADOKA search error: {e}")
+                return []
+
+    async def get_document(self, drucksache: str) -> Optional[Drucksache]:
+        """Look up a single document by ID via the search endpoint with a
+        document_number filter."""
+        # Pragmatic MVP: do a broad search and filter for the requested ID.
+        # A targeted single-document fetch would require a different
+        # action.search.json structure that we have not reverse-engineered yet.
+        results = await self.search(query="", limit=200)
+        for doc in results:
+            if doc.drucksache == drucksache:
+                return doc
+        return None
+
+    async def download_text(self, drucksache: str) -> Optional[str]:
+        """Download the PDF for a Drucksache and extract its text."""
+        import fitz  # PyMuPDF
+
+        doc = await self.get_document(drucksache)
+        if not doc or not doc.link:
+            return None
+
+        async with httpx.AsyncClient(
+            timeout=60,
+            follow_redirects=True,
+            headers={"User-Agent": "Mozilla/5.0 GWOE-Antragspruefer"},
+        ) as client:
+            try:
+                resp = await client.get(doc.link)
+                if resp.status_code != 200:
+                    return None
+                pdf = fitz.open(stream=resp.content, filetype="pdf")
+                text = ""
+                for page in pdf:
+                    text += page.get_text()
+                pdf.close()
+                return text
+            except Exception as e:
+                print(f"PADOKA download error for {drucksache}: {e}")
+                return None
+
+
 class BayernAdapter(ParlamentAdapter):
     """Adapter for Bayerischer Landtag."""
-    
+
     bundesland = "BY"
     name = "Bayerischer Landtag"
     base_url = "https://www.bayern.landtag.de"
-    
+
     async def search(self, query: str, limit: int = 20) -> list[Drucksache]:
         # TODO: Implement Bayern search
         return []
-    
+
     async def get_document(self, drucksache: str) -> Optional[Drucksache]:
         # TODO: Implement
         return None
-    
+
     async def download_text(self, drucksache: str) -> Optional[str]:
         return None
 
@@ -345,6 +667,7 @@ class BWAdapter(ParlamentAdapter):
 # Registry of adapters
 ADAPTERS = {
     "NRW": NRWAdapter(),
+    "LSA": PortalaAdapter(),
     "BY": BayernAdapter(),
     "BW": BWAdapter(),
 }