#!/usr/bin/env python3 """Resolve Nextcloud view rows through explicitly configured storage mounts.""" from __future__ import annotations import argparse import csv import json import os import re import subprocess import sys import tempfile from pathlib import Path, PurePosixPath IDENTIFIER = re.compile(r"^[A-Za-z_][A-Za-z0-9_]*(?:\.[A-Za-z_][A-Za-z0-9_]*)?$") def validate_view(name: str) -> str: value = str(name).strip() if not IDENTIFIER.fullmatch(value): raise ValueError(f"invalid SQL view name: {value!r}") return value def read_config(path: Path) -> dict[str, tuple[str, Path]]: result: dict[str, tuple[str, Path]] = {} with path.open(encoding="utf-8") as handle: for number, line in enumerate(handle, 1): line=line.rstrip("\n") if not line or line.startswith("#"):continue fields=line.split("\t") if len(fields)!=3:raise ValueError(f"{path}:{number}: expected storage_id, source_prefix and local_mount") storage_id,prefix,mount=fields if not storage_id.strip():raise ValueError(f"{path}:{number}: storage_id is empty") result[storage_id]=(prefix.strip("/"),Path(mount)) return result def run_query(args: argparse.Namespace, env: dict[str,str], sql: str) -> subprocess.CompletedProcess[str]: command=["psql","-X","-A","-F","\t","-t","-v","ON_ERROR_STOP=1","-h",args.host,"-p",str(args.port),"-U",args.user,"-d",args.database,"-c",sql] return subprocess.run(command,env=env,check=False,text=True,capture_output=True) def query_rows(args: argparse.Namespace) -> list[list[str]]: password=args.password_file.read_text(encoding="utf-8").strip();env=os.environ.copy();env["PGPASSWORD"]=password;view=validate_view(args.view) modern_sql=f"SELECT share_id, item_type, display_name, storage_id, source_path FROM {view} ORDER BY share_id" completed=run_query(args,env,modern_sql) if completed.returncode==0:return list(csv.reader(completed.stdout.splitlines(),delimiter="\t")) if "item_type" not in completed.stderr or "does not exist" not in completed.stderr:raise RuntimeError(completed.stderr.strip() or "Nextcloud source view query failed") legacy_sql=f"SELECT share_id, display_name, storage_id, source_path FROM {view} ORDER BY share_id" completed=run_query(args,env,legacy_sql) if completed.returncode!=0:raise RuntimeError(completed.stderr.strip() or "legacy Nextcloud source view query failed") rows=[] for row in csv.reader(completed.stdout.splitlines(),delimiter="\t"): if len(row)==4: share_id,display_name,storage_id,source_path=row;rows.append([share_id,"",display_name,storage_id,source_path]) else:rows.append(row) return rows def contained_join(root: Path, relative: str) -> Path: parts=PurePosixPath(relative).parts if relative.startswith("/") or ".." in parts:raise ValueError(f"unsafe source path: {relative}") return root.joinpath(*parts) def build(args: argparse.Namespace) -> dict[str,object]: validate_view(args.view);adapters=read_config(args.storage_config);rows=query_rows(args) if not rows and not args.allow_empty:raise RuntimeError("Nextcloud returned no Showcase shares; refusing an empty manifest") manifest=[];errors=[];folder_count=0;file_count=0 for row in rows: if len(row)!=5:errors.append(f"invalid database row with {len(row)} columns");continue share_id,item_type,display_name,storage_id,source_path=row;item_type=item_type.strip().lower() if item_type and item_type not in {"folder","file"}:errors.append(f"share {share_id}: unsupported item_type {item_type!r}");continue adapter=adapters.get(storage_id) if not adapter:errors.append(f"share {share_id}: unknown storage {storage_id}");continue prefix,mount=adapter;relative=source_path.strip("/") if prefix: expected=prefix+"/" if relative!=prefix and not relative.startswith(expected):errors.append(f"share {share_id}: path does not match configured prefix");continue relative=relative[len(prefix):].lstrip("/") source=contained_join(mount,relative) if not mount.is_mount():errors.append(f"share {share_id}: storage mount unavailable: {mount}");continue if not item_type: if source.is_dir():item_type="folder" elif source.is_file():item_type="file" else:errors.append(f"share {share_id}: source unavailable: {source}");continue if item_type=="folder": if not source.is_dir():errors.append(f"share {share_id}: source directory unavailable: {source}");continue folder_count+=1 else: if not source.is_file():errors.append(f"share {share_id}: source file unavailable: {source}");continue file_count+=1 if "\t" in display_name or "\n" in display_name or "\r" in display_name:errors.append(f"share {share_id}: display name contains unsupported control characters");continue source_text=str(source) if "\t" in source_text or "\n" in source_text or "\r" in source_text:errors.append(f"share {share_id}: source path contains unsupported control characters");continue manifest.append(f"{share_id}\t{item_type}\t{display_name.lstrip('/')}\t{source}") if errors:raise RuntimeError("; ".join(errors)) if len(manifest)!=len(rows):raise RuntimeError("not all Showcase shares could be resolved") args.output.parent.mkdir(parents=True,exist_ok=True) with tempfile.NamedTemporaryFile("w",encoding="utf-8",dir=args.output.parent,delete=False) as handle: handle.write("\n".join(manifest)+("\n" if manifest else ""));temporary=Path(handle.name) temporary.replace(args.output) return {"shares":len(manifest),"folders":folder_count,"files":file_count,"manifest":str(args.output)} def main() -> int: parser=argparse.ArgumentParser();parser.add_argument("--host",required=True);parser.add_argument("--port",type=int,default=5432);parser.add_argument("--database",required=True);parser.add_argument("--user",required=True);parser.add_argument("--password-file",required=True,type=Path);parser.add_argument("--view",default="piwigo_showcase_sources");parser.add_argument("--storage-config",required=True,type=Path);parser.add_argument("--output",required=True,type=Path);parser.add_argument("--allow-empty",action="store_true");args=parser.parse_args() try:print(json.dumps(build(args),ensure_ascii=False)) except Exception as error:print(f"manifest: {error}",file=sys.stderr);return 1 return 0 if __name__=="__main__":raise SystemExit(main())