350 lines
12 KiB
Python
350 lines
12 KiB
Python
import hashlib
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from typing import Annotated
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from fastapi import APIRouter, HTTPException, Path, Query, Request, Response, status
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from app.schemas.font import FontInfoResponse
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from app.services import engine
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from app.services.font import font_info_to_response
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from app.services.render_cache import RENDERER_VERSION, RenderMode, TileCacheKey, tile_cache
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from app.services.store import document_store
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router = APIRouter(prefix="/documents/{document_id}/pages", tags=["render"])
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compat_router = APIRouter(tags=["render"])
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def _etag(data: bytes) -> str:
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return hashlib.sha256(data).hexdigest()[:16]
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@router.get("/{page_index}/render")
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def render_page(
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request: Request,
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document_id: str,
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page_index: Annotated[int, Path(ge=0)],
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dpi: int = 96,
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zoom: float = 1.0,
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rotation: int = 0,
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render_mode: RenderMode = RenderMode.NORMAL
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) -> Response:
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print(f"[RENDER] document_id={document_id} page_index={page_index} zoom={zoom} dpi={dpi}")
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if not engine.is_available():
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raise HTTPException(
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status_code=status.HTTP_501_NOT_IMPLEMENTED,
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detail="Engine bridge (bindings/python) not yet available.",
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)
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doc_info = document_store.get_document(document_id)
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if not doc_info:
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raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Document not found")
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try:
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doc = doc_info["doc_instance"]
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page = doc.get_page(page_index)
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key = TileCacheKey(
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doc_hash=doc_info.get("doc_hash", ""),
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renderer_version=RENDERER_VERSION,
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page=page_index,
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dpi=dpi,
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zoom=zoom,
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rotation=rotation,
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render_mode=render_mode,
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tile_x=0.0,
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tile_y=0.0,
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tile_w=round(page.width, 2),
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tile_h=round(page.height, 2)
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)
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cached = tile_cache.get(key)
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if cached:
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etag_val = f'"{_etag(cached)}"'
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if request.headers.get("if-none-match") == etag_val:
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return Response(status_code=304)
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return Response(
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content=cached,
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media_type="image/png",
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headers={"ETag": etag_val, "X-Cache": "HIT", "Cache-Control": "private, max-age=300"}
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)
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import time
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start = time.perf_counter_ns()
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img = page.render(dpi)
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elapsed = time.perf_counter_ns() - start
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tile_cache.put(key, img.data)
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tile_cache.record_render_time(elapsed)
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etag_val = f'"{_etag(img.data)}"'
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return Response(
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content=img.data,
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media_type="image/png",
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headers={"ETag": etag_val, "X-Cache": "MISS", "Cache-Control": "private, max-age=300"}
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)
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except IndexError:
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raise HTTPException(
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status_code=status.HTTP_404_NOT_FOUND, detail="Page index out of bounds"
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)
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except Exception as e:
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raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(e))
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@router.get("/{page_index}/render-tile")
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def render_page_tile(
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request: Request,
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document_id: str,
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page_index: Annotated[int, Path(ge=0)],
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x: float,
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y: float,
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width: float,
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height: float,
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dpi: int = 96,
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zoom: float = 1.0,
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rotation: int = 0,
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render_mode: RenderMode = RenderMode.NORMAL
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) -> Response:
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if not engine.is_available():
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raise HTTPException(
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status_code=status.HTTP_501_NOT_IMPLEMENTED,
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detail="Engine bridge (bindings/python) not yet available.",
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)
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doc_info = document_store.get_document(document_id)
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if not doc_info:
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raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Document not found")
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try:
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doc = doc_info["doc_instance"]
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page = doc.get_page(page_index)
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key = TileCacheKey(
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doc_hash=doc_info.get("doc_hash", ""),
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renderer_version=RENDERER_VERSION,
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page=page_index,
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dpi=dpi,
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zoom=zoom,
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rotation=rotation,
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render_mode=render_mode,
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tile_x=round(x, 2),
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tile_y=round(y, 2),
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tile_w=round(width, 2),
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tile_h=round(height, 2)
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)
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cached = tile_cache.get(key)
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if cached:
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etag_val = f'"{_etag(cached)}"'
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if request.headers.get("if-none-match") == etag_val:
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return Response(status_code=304)
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return Response(
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content=cached,
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media_type="image/png",
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headers={"ETag": etag_val, "X-Cache": "HIT", "Cache-Control": "private, max-age=300"}
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)
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import time
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start = time.perf_counter_ns()
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img_width, img_height, img_data = page.render_tile(dpi, x, y, width, height)
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import io
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from PIL import Image
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img = Image.frombytes("RGBA", (img_width, img_height), img_data)
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out_buf = io.BytesIO()
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img.save(out_buf, format="PNG")
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png_bytes = out_buf.getvalue()
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elapsed = time.perf_counter_ns() - start
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tile_cache.put(key, png_bytes)
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tile_cache.record_render_time(elapsed)
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etag_val = f'"{_etag(png_bytes)}"'
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return Response(
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content=png_bytes,
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media_type="image/png",
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headers={"ETag": etag_val, "X-Cache": "MISS", "Cache-Control": "private, max-age=300"}
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)
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except IndexError:
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raise HTTPException(
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status_code=status.HTTP_404_NOT_FOUND, detail="Page index out of bounds"
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)
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except Exception as e:
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raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(e))
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@router.get("/{page_index}/text")
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def extract_page_text(document_id: str, page_index: Annotated[int, Path(ge=0)]):
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if not engine.is_available():
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raise HTTPException(
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status_code=status.HTTP_501_NOT_IMPLEMENTED,
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detail="Engine bridge (bindings/python) not yet available.",
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)
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doc_info = document_store.get_document(document_id)
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if not doc_info:
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raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Document not found")
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try:
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doc = doc_info["doc_instance"]
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page = doc.get_page(page_index)
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text = page.extract_text()
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annots = page.extract_annotations_text()
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if annots:
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text += "\n" + "\n".join(annots)
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page_height = page.height
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glyphs = page.extract_text_with_bounds()
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for g in glyphs:
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g["y"] = page_height - (g["y"] + g["h"])
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return {"text": text, "glyphs": glyphs}
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except IndexError:
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raise HTTPException(
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status_code=status.HTTP_404_NOT_FOUND, detail="Page index out of bounds"
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)
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except Exception as e:
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raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(e))
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@compat_router.get("/render/{document_id}")
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def render_page_compat(
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request: Request, document_id: str, page: int = 0, zoom: float = 1.0, rotation: int = 0, dpi: int | None = None
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) -> Response:
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if dpi is None:
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dpi = int(96 * zoom)
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print(f"[RENDER_COMPAT] document_id={document_id} page={page} zoom={zoom} dpi={dpi}")
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return render_page(request, document_id, page, dpi, zoom, rotation, RenderMode.NORMAL)
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@router.get("/{page_index}")
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def get_page_info(document_id: str, page_index: Annotated[int, Path(ge=0)]):
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if not engine.is_available():
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raise HTTPException(
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status_code=status.HTTP_501_NOT_IMPLEMENTED,
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detail="Engine bridge (bindings/python) not yet available.",
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)
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doc_info = document_store.get_document(document_id)
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if not doc_info:
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raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Document not found")
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try:
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doc = doc_info["doc_instance"]
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page = doc.get_page(page_index)
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return {"width": page.width, "height": page.height}
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except IndexError:
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raise HTTPException(
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status_code=status.HTTP_404_NOT_FOUND, detail="Page index out of bounds"
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)
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except Exception as e:
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raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(e))
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@router.get("/{page_index}/transform/page-to-device")
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def transform_page_to_device(
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document_id: str,
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page_index: int,
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x: float,
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y: float,
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device_width: int,
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device_height: int,
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rotate: int = 0,
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):
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if not engine.is_available():
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raise HTTPException(
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status_code=status.HTTP_501_NOT_IMPLEMENTED, detail="Engine unavailable"
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)
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doc_info = document_store.get_document(document_id)
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if not doc_info:
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raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Document not found")
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try:
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pdfengine = engine.require()
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doc = doc_info["doc_instance"]
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page = doc.get_page(page_index)
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pt = pdfengine.Point2D(x=x, y=y)
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res = page.page_to_device(pt, device_width, device_height, rotate)
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return {"x": res.x, "y": res.y}
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except Exception as e:
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raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(e))
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@router.get("/{page_index}/transform/device-to-page")
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def transform_device_to_page(
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document_id: str,
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page_index: int,
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x: int,
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y: int,
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device_width: int,
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device_height: int,
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rotate: int = 0,
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):
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if not engine.is_available():
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raise HTTPException(
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status_code=status.HTTP_501_NOT_IMPLEMENTED, detail="Engine unavailable"
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)
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doc_info = document_store.get_document(document_id)
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if not doc_info:
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raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Document not found")
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try:
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pdfengine = engine.require()
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doc = doc_info["doc_instance"]
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page = doc.get_page(page_index)
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pt = pdfengine.DevicePoint(x=x, y=y)
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res = page.device_to_page(pt, device_width, device_height, rotate)
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return {"x": res.x, "y": res.y}
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except Exception as e:
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raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(e))
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@router.get("/{page_index}/fonts", response_model=list[FontInfoResponse])
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def get_page_fonts(document_id: str, page_index: int) -> list[FontInfoResponse]:
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if not engine.is_available():
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raise HTTPException(
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status_code=status.HTTP_501_NOT_IMPLEMENTED,
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detail="Engine bridge (bindings/python) not yet available.",
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)
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doc_info = document_store.get_document(document_id)
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if not doc_info:
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raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Document not found")
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try:
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doc = doc_info["doc_instance"]
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page = doc.get_page(page_index)
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fonts = page.get_fonts()
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return [font_info_to_response(f) for f in fonts]
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except IndexError:
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raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Page index out of range")
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except Exception as e:
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raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(e))
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@router.get("/{page_index}/fonts/glyph-width")
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def get_page_glyph_width(
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document_id: str,
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page_index: Annotated[int, Path(ge=0)],
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font_name: str,
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charcode: int,
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font_size: Annotated[float, Query(gt=0)] = 12.0,
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):
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if not engine.is_available():
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raise HTTPException(
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status_code=status.HTTP_501_NOT_IMPLEMENTED,
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detail="Engine bridge (bindings/python) not yet available.",
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)
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doc_info = document_store.get_document(document_id)
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if not doc_info:
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raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Document not found")
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try:
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doc = doc_info["doc_instance"]
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page = doc.get_page(page_index)
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width = page.get_glyph_width(font_name, charcode, font_size)
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return {"width": width}
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except IndexError:
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raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Page index out of range")
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except Exception as e:
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raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(e))
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