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SnapOtterandGitHub
0cdd560ac4
Draw, type, or upload a signature and place resizable/rotatable copies across PDF pages; output flattened server-side with PyMuPDF. Visual electronic signature, not cryptographic. New interactive-sign display mode (pdf.js + Konva) and a custom docs-pool route.
58 lines
2.4 KiB
Python
58 lines
2.4 KiB
Python
"""Stamp signature images onto a PDF and save a flattened copy.
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Args: {"input": in, "output": out, "signatures": [paths], "placements": [
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{"sig": idx, "page": 0-based, "x": 0..1, "y": 0..1, "w": 0..1, "h": 0..1}
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]}. Coordinates are page fractions, top-left origin. Each signature PNG is
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already rotated; insert_image is always axis-aligned. Prints {"ok": true,
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"placed": N}. insert_image draws into page content, so output is flattened."""
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import json
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import sys
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def main():
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args = json.loads(sys.argv[1]) if len(sys.argv) > 1 else {}
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path = args.get("input")
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out = args.get("output")
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signatures = args.get("signatures") or []
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placements = args.get("placements") or []
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if not path or not out or not isinstance(placements, list) or not placements:
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print(json.dumps({"error": "missing input/output/placements"}))
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sys.exit(1)
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try:
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import fitz
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except ImportError:
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print(json.dumps({"error": "PyMuPDF not installed"}))
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sys.exit(1)
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try:
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doc = fitz.open(path)
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page_count = doc.page_count
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for p in placements:
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page_no = p.get("page")
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sig_idx = p.get("sig")
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if not isinstance(page_no, int) or page_no < 0 or page_no >= page_count:
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print(json.dumps({"error": f"page index {page_no} out of range (0..{page_count - 1})"}))
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sys.exit(1)
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if not isinstance(sig_idx, int) or sig_idx < 0 or sig_idx >= len(signatures):
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print(json.dumps({"error": f"signature index {sig_idx} out of range"}))
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sys.exit(1)
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page = doc[page_no]
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r = page.rect # rotation-aware; x0/y0 carry the CropBox origin
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x0, y0, w, h = r.x0, r.y0, r.width, r.height
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fx, fy, fw, fh = (float(p["x"]), float(p["y"]), float(p["w"]), float(p["h"]))
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rect = fitz.Rect(
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x0 + fx * w, y0 + fy * h, x0 + (fx + fw) * w, y0 + (fy + fh) * h
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)
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with open(signatures[sig_idx], "rb") as f:
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page.insert_image(rect, stream=f.read(), keep_proportion=False)
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doc.save(out, garbage=4, deflate=True)
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doc.close()
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print(json.dumps({"ok": True, "placed": len(placements)}))
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except SystemExit:
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raise
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except Exception as exc: # noqa: BLE001
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print(json.dumps({"error": str(exc)}))
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sys.exit(1)
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if __name__ == "__main__":
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main()
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