Merge pull request #683 from nathan-at-least/t681.remove-python-fetch-params

Remove fetch-params.py.

zcutil/fetch-params.py

@@ -1,162 +0,0 @@
-#!/usr/bin/env python
-
-"""fetch-params.py - fetch Zcash public alpha keys
-
-Usage: python fetch-params.py
-"""
-
-
-from __future__ import print_function
-
-import hashlib
-import os
-import subprocess
-import sys
-
-
-urls = [
-    'https://z.cash/downloads/zc-testnet-public-alpha-proving.key',
-    'https://z.cash/downloads/zc-testnet-public-alpha-verification.key',
-]
-
-sizes = [
-    2007057094,
-    3478,
-]
-
-hash_algo = hashlib.sha256
-
-hashes = [
-    '7844a96933979158886a5b69fb163f49de76120fa1dcfc33b16c83c134e61817',
-    '6902fd687bface72e572a7cda57f6da5a0c606c7b9769f30becd255e57924f41',
-]
-
-params_readme = """
-This directory stores common zcash zkSNARK parameters. Note that is is
-distinct from the daemon's -datadir argument because the parameters are
-large and may be shared across multiple distinct -datadir's such as when
-setting up test networks.
-"""
-
-fetch_params_info = """
-This script will fetch the Zcash zkSNARK parameters and verify their
-integrity with sha256sum.
-
-The parameters currently are about 2GiB in size, so plan accordingly
-for your bandwidth constraints. If the files are already present and
-have the correct sha256sum, no networking is used.
-"""
-
-
-def which(name):
-    p = subprocess.Popen(
-        ['which', name],
-        stdout=subprocess.PIPE,
-        universal_newlines=True,
-    )
-    p.wait()
-    if not p.returncode == 0:
-        return None
-    out = p.stdout.read()
-    return out.rstrip('\n')
-
-
-# Note: This assumes cwd is set appropriately!
-def fetch(url):
-    cmd = which('curl') or which('wget') or None
-    if cmd is None:
-        raise OSError('curl or wget is required')
-    options = {
-        'curl': [
-            '--remote-name',
-            '--insecure',
-            '--continue-at', '-',
-            '--location',
-        ],
-        'wget': [
-            '--progress=dot:giga',
-            # Note: --no-check-certificate should be ok, since we rely
-            # on sha256 for integrity, and there's no confidentiality
-            # requirement.  Our website uses letsencrypt certificates
-            # which are not supported by some wget installations,
-            # so we expect some cert failures.
-            '--no-check-certificate',
-        ],
-    }
-    opt = options[os.path.basename(cmd)]
-    ret = subprocess.call([cmd, url] + opt)
-    if not ret == 0:
-        raise OSError('%s failed with status %i' % (cmd, ret))
-
-
-def verify(filename, digest):
-    hash = hash_algo()
-    with open(filename, 'rb') as f:
-        while True:
-            dat = f.read(hash.block_size * 1024)
-            if len(dat) == 0:
-                break
-            hash.update(dat)
-    return hash.hexdigest() == digest
-
-
-if __name__ == '__main__':
-
-    if len(sys.argv) == 1:
-        pass
-    elif len(sys.argv) == 2 and sys.argv[1] in ('-h', '--help'):
-        print(__doc__)
-        sys.exit(0)
-    else:
-        print(__doc__)
-        sys.exit(1)
-
-    home = os.environ['HOME']
-
-    # This may be the first time the user's run this script, so give
-    # them some info, especially about bandwidth usage:
-    print(fetch_params_info)
-
-    # Now create params_dir and insert a README if necessary:
-    print('Creating params directory...')
-    params_dir = os.path.join(home, '.zcash-params')
-    try:
-        os.mkdir(params_dir)
-    except OSError:
-        pass
-    params_readme_path = os.path.join(params_dir, 'README')
-    if not os.path.exists(params_readme_path):
-        with open(params_readme_path, 'w+') as f:
-            print(params_readme, file=f)
-    print('For details about this directory, see:', params_readme_path)
-
-    regtest_dir = os.path.join(params_dir, 'regtest')
-    try:
-        os.mkdir(regtest_dir)
-    except OSError:
-        pass
-    # This should have the same params as regtest.
-    # We use symlinks for now.
-    testnet3_dir = os.path.join(params_dir, 'testnet3')
-    try:
-        os.mkdir(testnet3_dir)
-    except OSError:
-        pass
-    os.chdir(regtest_dir)
-    for (url, size, hash) in zip(urls, sizes, hashes):
-        filename = url.split('/')[-1]
-        print('Fetching', filename, '...')
-        if not os.path.exists(filename) or \
-                not os.stat(filename).st_size == size:
-            fetch(url)
-        # Now verify their hashes:
-        print('Verifying', filename, '...')
-        assert verify(filename, hash)
-        try:
-            os.remove(os.path.join(testnet3_dir, filename))
-        except OSError:
-            pass
-        os.symlink(
-            os.path.join(regtest_dir, filename),
-            os.path.join(testnet3_dir, filename),
-        )