local_cloud.py

import os, hashlib

class LocalCloudManager:
    def __init__(self):
        os.makedirs("local_uploads", exist_ok=True)
        self.providers = ["LOCAL-AWS", "LOCAL-GCP", "LOCAL-AZURE"]

    def upload_file_chunks(self, file_id, encrypted_data):
        """Split file into 3 chunks and save locally"""
        size = len(encrypted_data)
        part = size // 3
        paths = {}
        for i in range(3):
            start = i * part
            end = (i + 1) * part if i < 2 else size
            chunk = encrypted_data[start:end]
            name = f"{file_id}_chunk{i}.bin"
            path = os.path.join("local_uploads", name)
            with open(path, "wb") as f:
                f.write(chunk)
            paths[f"chunk_{i}"] = {
                "provider": self.providers[i],
                "path": path,
                "sha512": hashlib.sha512(chunk).hexdigest()
            }
            print(f" Saved {name} to {self.providers[i]}")
        return paths

    def upload_key_shares(self, file_id, shares):
        """Save Shamir key shares locally"""
        paths = {}
        for i, (idx, share) in enumerate(shares):
            name = f"{file_id}_share{idx}.key"
            path = os.path.join("local_uploads", name)
            with open(path, "wb") as f:
                f.write(share)
            paths[f"share_{idx}"] = {
                "provider": self.providers[i % 3],
                "path": path,
                "sha512": hashlib.sha512(share).hexdigest()
            }
            print(f"Stored key share {idx} to {self.providers[i % 3]}")
        return paths