Import AITURK IDE 1.0.0-beta.1 from Hermes 63279301; preserve MIT license

skills/productivity/pdf/scripts/pdf_stamp.py

@@ -0,0 +1,143 @@
+#!/usr/bin/env python3
+"""Stamp text or an image at coordinates onto selected PDF pages.
+
+Builds an in-memory single-page overlay with reportlab, then merges it
+onto each selected page with pypdf. Coordinates are PDF points, origin
+bottom-left. Covers 'sign here' arrows, diagonal DRAFT banners, and
+page-corner labels.
+
+Examples:
+  pdf_stamp.py in.pdf -o out.pdf --text "DRAFT" --x 200 --y 400 \
+      --font-size 60 --rotation 45 --opacity 0.3 --color "#cc0000"
+  pdf_stamp.py in.pdf -o out.pdf --image sig.png --x 400 --y 60 \
+      --width 120 --pages 3
+"""
+from __future__ import annotations
+
+import argparse
+import io
+import json
+import sys
+
+
+def parse_pages(spec: str, page_count: int) -> list[int]:
+    pages: set[int] = set()
+    for part in spec.split(","):
+        part = part.strip()
+        if not part:
+            continue
+        if "-" in part:
+            start_s, _, end_s = part.partition("-")
+            start = int(start_s) if start_s else 1
+            end = int(end_s) if end_s else page_count
+            pages.update(range(start, end + 1))
+        else:
+            pages.add(int(part))
+    bad = [p for p in pages if not 1 <= p <= page_count]
+    if bad:
+        raise ValueError(f"pages out of range 1-{page_count}: {sorted(bad)}")
+    return sorted(pages)
+
+
+def build_overlay(args, page_width: float, page_height: float) -> bytes:
+    from reportlab.lib.colors import HexColor
+    from reportlab.pdfgen import canvas
+    buf = io.BytesIO()
+    c = canvas.Canvas(buf, pagesize=(page_width, page_height))
+    c.saveState()
+    try:
+        c.setFillAlpha(float(args.opacity))
+        c.setStrokeAlpha(float(args.opacity))
+    except Exception:
+        pass  # very old reportlab: no alpha support
+    c.translate(float(args.x), float(args.y))
+    if args.rotation:
+        c.rotate(float(args.rotation))
+    if args.text:
+        c.setFont(args.font, float(args.font_size))
+        c.setFillColor(HexColor(args.color))
+        c.drawString(0, 0, args.text)
+    else:
+        kwargs = {}
+        if args.width:
+            kwargs["width"] = float(args.width)
+        if args.height:
+            kwargs["height"] = float(args.height)
+        if "width" in kwargs and "height" not in kwargs:
+            from PIL import Image as PILImage
+            with PILImage.open(args.image) as im:
+                kwargs["height"] = kwargs["width"] * im.height / im.width
+        c.drawImage(args.image, 0, 0, mask="auto", **kwargs)
+    c.restoreState()
+    c.save()
+    return buf.getvalue()
+
+
+def main() -> int:
+    for stream in (sys.stdout, sys.stderr):
+        try:
+            stream.reconfigure(encoding="utf-8")
+        except Exception:
+            pass
+    parser = argparse.ArgumentParser(description="Stamp text or an image onto PDF pages.")
+    parser.add_argument("pdf", help="Input PDF path")
+    parser.add_argument("-o", "--output", required=True, help="Output PDF path")
+    what = parser.add_mutually_exclusive_group(required=True)
+    what.add_argument("--text", help="Text to stamp")
+    what.add_argument("--image", help="Image file to stamp (PNG/JPEG)")
+    parser.add_argument("--x", type=float, required=True, help="X in points (origin bottom-left)")
+    parser.add_argument("--y", type=float, required=True, help="Y in points")
+    parser.add_argument("--pages", default="1-", help="1-based ranges, e.g. '1-3,5' (default: all)")
+    parser.add_argument("--font", default="Helvetica", help="Font name (default Helvetica)")
+    parser.add_argument("--font-size", type=float, default=24, help="Font size in points")
+    parser.add_argument("--color", default="#000000", help="Text color as #RRGGBB")
+    parser.add_argument("--rotation", type=float, default=0, help="Degrees counterclockwise")
+    parser.add_argument("--opacity", type=float, default=1.0, help="0.0-1.0 (default 1.0)")
+    parser.add_argument("--width", type=float, help="Image width in points")
+    parser.add_argument("--height", type=float, help="Image height in points")
+    parser.add_argument("--under", action="store_true",
+                        help="Place the stamp under existing content instead of over it")
+    parser.add_argument("--password", help="Password if the input is encrypted")
+    args = parser.parse_args()
+
+    try:
+        from pypdf import PdfReader, PdfWriter
+    except ImportError:
+        print("Missing dependency: install with 'python3 -m pip install pypdf reportlab'",
+              file=sys.stderr)
+        return 2
+
+    reader = PdfReader(args.pdf)
+    if reader.is_encrypted:
+        if args.password is None or not reader.decrypt(args.password):
+            print("Error: input is encrypted; pass --password", file=sys.stderr)
+            return 3
+    try:
+        pages = set(parse_pages(args.pages, len(reader.pages)))
+    except ValueError as exc:
+        print(f"Error: {exc}", file=sys.stderr)
+        return 4
+
+    writer = PdfWriter()
+    overlay_cache: dict[tuple[float, float], object] = {}
+    for idx, page in enumerate(reader.pages, start=1):
+        if idx in pages:
+            size = (float(page.mediabox.width), float(page.mediabox.height))
+            if size not in overlay_cache:
+                overlay_pdf = PdfReader(io.BytesIO(build_overlay(args, *size)))
+                overlay_cache[size] = overlay_pdf.pages[0]
+            stamp = overlay_cache[size]
+            if args.under:
+                page.merge_page(stamp, over=False)
+            else:
+                page.merge_page(stamp)
+        writer.add_page(page)
+    with open(args.output, "wb") as fh:
+        writer.write(fh)
+    print(json.dumps({"output": args.output, "stamped_pages": sorted(pages),
+                      "kind": "text" if args.text else "image"}, ensure_ascii=False))
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())