Haketilo

# SPDX-License-Identifier: AGPL-3.0-or-later

"""

Our helpful little stand-in for the Internet

"""

# This file is part of Haketilo.

#

# Copyright (C) 2021 jahoti <jahoti@tilde.team>

# Copyright (C) 2021 Wojtek Kosior <koszko@koszko.org>

#

# This program is free software: you can redistribute it and/or modify

# it under the terms of the GNU Affero General Public License as

# published by the Free Software Foundation, either version 3 of the

# License, or (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU Affero General Public License for more details.

#

# You should have received a copy of the GNU Affero General Public License

# along with this program.  If not, see <https://www.gnu.org/licenses/>.

#

#

# I, Wojtek Kosior, thereby promise not to sue for violation of this

# file's license. Although I request that you do not make use of this code

# in a proprietary program, I am not going to enforce this in court.

from hashlib import sha256

from pathlib import Path

from shutil import rmtree

from threading import Lock

from uuid import uuid4

import json

from .misc_constants import here

from .unit.utils import * # sample repo data

# TODO: instead of having the entire catalog defined here, make it possible to

# add catalog items from within individual test files.

served_scripts = {}

served_scripts_lock = Lock()

def start_serving_script(script_text):

    """

    Register given script so that it is served at

    https://serve.scrip.ts/?sha256=<script's_sha256_sum>

    Returns the URL at which script will be served.

    This function lacks thread safety. Might moght consider fixing this if it

    turns

    """

    sha256sum = sha256(script_text.encode()).digest().hex()

    served_scripts_lock.acquire()

    served_scripts[sha256sum] = script_text

    served_scripts_lock.release()

    return f'https://serve.scrip.ts/?sha256={sha256sum}'

def serve_script(command, get_params, post_params):

    """

    info() callback to pass to request-handling code in server.py. Facilitates

    serving scripts that have been registered with start_serving_script().

    """

    served_scripts_lock.acquire()

    try:

        script = served_scripts.get(get_params['sha256'][0])

    finally:

        served_scripts_lock.release()

    if script is None:

        return 404, {}, b''

    return 200, {'Content-Type': 'application/javascript'}, script

def dump_scripts(directory='./injected_scripts'):

    """

    Write all scripts that have been registered with start_serving_script()

    under the provided directory. If the directory already exists, it is wiped

    beforehand. If it doesn't exist, it is created.

    """

    directory = Path(directory)

    rmtree(directory, ignore_errors=True)

    directory.mkdir(parents=True)

    served_scripts_lock.acquire()

    for sha256, script in served_scripts.items():

        with open(directory / sha256, 'wt') as file:

            file.write(script)

    served_scripts_lock.release()

some_data = '{"some": "data"}'

# used by handler function of https://counterdoma.in

request_counter = 0

def serve_counter(command, get_params, post_params):

    global request_counter

    request_counter += 1

    return (

        200,

        {'Cache-Control': 'private, max-age=0, no-store'},

        json.dumps({'counter': request_counter})

    )

# Mock a Hydrilla repository.

make_handler = lambda txt: lambda c, g, p: (200, {}, txt)

# Mock files in the repository.

sample_contents = [f'Mi povas manĝi vitron, ĝi ne damaĝas min {i}'

                   for i in range(9)]

sample_hashes = [sha256(c.encode()).digest().hex() for c in sample_contents]

file_url = lambda hashed: f'https://hydril.la/file/sha256/{hashed}'

sample_files_catalog = dict([(file_url(h), make_handler(c))

                             for h, c in zip(sample_hashes, sample_contents)])

# Mock resources and mappings in the repository.

sample_resource_templates = []

for deps in [(0, 1, 2, 3), (3, 4, 5, 6), (6, 7, 8, 9)]:

    letters = [chr(ord('a') + i) for i in deps]

    sample_resource_templates.append({

        'id_suffix':    ''.join(letters),

        'files_count':  deps[0],

        'dependencies': [f'resource_{l}' for l in letters]

    })

suffixes = [srt['id_suffix'] for srt in sample_resource_templates]

sample_resource_templates.append({

    'id_suffix':    '-'.join(suffixes),

    'files_count':  2,

    'dependencies': [f'resource_{suffix}' for suffix in suffixes]

})

for i in range(10):

    sample_resource_templates.append({

        'id_suffix':    chr(ord('a') + i),

        'files_count':  i,

        'dependencies': []

    })

sample_resources_catalog = {}

sample_mappings_catalog = {}

sample_queries = {}

for srt in sample_resource_templates:

    resource = make_sample_resource()

    resource['api_schema_version']  = [1]

    resource['api_schema_revision'] = 1

    resource['identifier']          = f'resource_{srt["id_suffix"]}'

    resource['long_name']           = resource['identifier'].upper()

    resource['uuid']                = str(uuid4())

    resource['dependencies']        = srt['dependencies']

    resource['source_copyright']    = []

    resource['scripts']             = []

    for i in range(srt['files_count']):

        file_ref = {'file': f'file_{i}', 'sha256': sample_hashes[i]}

        resource[('source_copyright', 'scripts')[i & 1]].append(file_ref)

    resource_versions = [resource['version'], resource['version'].copy()]

    resource_versions[1][-1] += 1

    mapping = make_sample_mapping()

    mapping['api_schema_version']  = [1]

    mapping['api_schema_revision'] = 1

    mapping['identifier']          = f'mapping_{srt["id_suffix"]}'

    mapping['long_name']           = mapping['identifier'].upper()

    mapping['uuid']                = str(uuid4())

    mapping['source_copyright']    = resource['source_copyright']

    mapping_versions = [mapping['version'], mapping['version'].copy()]

    mapping_versions[1][-1] += 1

    sufs = [srt["id_suffix"], *[l for l in srt["id_suffix"] if l.isalpha()]]

    patterns = [f'https://example_{suf}.com/*' for suf in set(sufs)]

    payloads = {}

    for pat in patterns:

        payloads[pat] = {'identifier': resource['identifier']}

        queryable_url = pat.replace('*', 'something')

        if queryable_url not in sample_queries:

            sample_queries[queryable_url] = []

        sample_queries[queryable_url].append({

            'identifier': mapping['identifier'],

            'long_name':  mapping['long_name'],

            'version':    mapping_versions[1]

        })

    mapping['payloads'] = payloads

    for item, versions, catalog in [

        (resource, resource_versions, sample_resources_catalog),

        (mapping,  mapping_versions,  sample_mappings_catalog)

    ]:

        fmt = f'https://hydril.la/{item["type"]}/{item["identifier"]}%s.json'

        # Make 2 versions of each item so that we can test updates.

        for ver in versions:

            item['version'] = ver

            for fmt_arg in ('', '/' + item_version_string(item)):

                catalog[fmt % fmt_arg] = make_handler(json.dumps(item))

def serve_query(command, get_params, post_params):

    response = {

        'api_schema_version':  [1],

        'api_schema_revision': 1,

        'mappings':            sample_queries[get_params['url'][0]]

    }

    return (200, {}, json.dumps(response))

sample_queries_catalog = dict([(f'https://hydril.la/{suf}query', serve_query)

                               for suf in ('', '1/', '2/', '3/', '4/')])

catalog = {

    'http://gotmyowndoma.in':

    (302, {'location': 'http://gotmyowndoma.in/index.html'}, None),

    'http://gotmyowndoma.in/':

    (302, {'location': 'http://gotmyowndoma.in/index.html'}, None),

    'http://gotmyowndoma.in/index.html':

    (200, {}, here / 'data' / 'pages' / 'gotmyowndomain.html'),

    'https://gotmyowndoma.in':

    (302, {'location': 'https://gotmyowndoma.in/index.html'}, None),

    'https://gotmyowndoma.in/':

    (302, {'location': 'https://gotmyowndoma.in/index.html'}, None),

    'https://gotmyowndoma.in/index.html':

    (200, {}, here / 'data' / 'pages' / 'gotmyowndomain_https.html'),

    'https://gotmyowndoma.in/scripts_to_block_1.html':

    (200, {}, here / 'data' / 'pages' / 'scripts_to_block_1.html'),

    'https://anotherdoma.in/resource/blocked/by/CORS.json':

    lambda command, get_params, post_params: (200, {}, some_data),

    'https://counterdoma.in/': serve_counter,

    'https://serve.scrip.ts/': serve_script,

    'https://site.with.scripts.block.ed':

    (302, {'location': 'https://site.with.scripts.block.ed/index.html'}, None),

    'https://site.with.scripts.block.ed/':

    (302, {'location': 'https://site.with.scripts.block.ed/index.html'}, None),

    'https://site.with.scripts.block.ed/index.html':

    (200, {}, here / 'data' / 'pages' / 'gotmyowndomain_https.html'),

    'https://site.with.scripts.allow.ed':

    (302, {'location': 'https://site.with.scripts.allow.ed/index.html'}, None),

    'https://site.with.scripts.allow.ed/':

    (302, {'location': 'https://site.with.scripts.allow.ed/index.html'}, None),

    'https://site.with.scripts.allow.ed/index.html':

    (200, {}, here / 'data' / 'pages' / 'gotmyowndomain_https.html'),

    'https://site.with.paylo.ad':

    (302, {'location': 'https://site.with.paylo.ad/index.html'}, None),

    'https://site.with.paylo.ad/':

    (302, {'location': 'https://site.with.paylo.ad/index.html'}, None),

    'https://site.with.paylo.ad/index.html':

    (200, {}, here / 'data' / 'pages' / 'gotmyowndomain_https.html'),

    **sample_files_catalog,

    **sample_resources_catalog,

    **sample_mappings_catalog,

    **sample_queries_catalog

}