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</head>
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<body>
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<main>
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<article id="content">
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<header>
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<h1 class="title">Module <code>onionr.onionrutils.validatemetadata</code></h1>
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</header>
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<section id="section-intro">
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<p>Onionr - Private P2P Communication</p>
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<p>validate new block's metadata</p>
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<details class="source">
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<summary>Source code</summary>
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<pre><code class="python">'''
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Onionr - Private P2P Communication
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validate new block's metadata
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'''
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'''
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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'''
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import json
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import logger, onionrexceptions
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from etc import onionrvalues
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from onionrutils import stringvalidators, epoch, bytesconverter
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import config, filepaths, onionrcrypto
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def validate_metadata(metadata, block_data) -> bool:
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'''Validate metadata meets onionr spec (does not validate proof value computation), take in either dictionary or json string'''
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ret_data = False
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max_clock_difference = onionrvalues.MAX_BLOCK_CLOCK_SKEW
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# convert to dict if it is json string
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if type(metadata) is str:
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try:
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metadata = json.loads(metadata)
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except json.JSONDecodeError:
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pass
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# Validate metadata dict for invalid keys to sizes that are too large
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maxAge = min(config.get("general.max_block_age", onionrvalues.DEFAULT_EXPIRE), onionrvalues.DEFAULT_EXPIRE)
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if type(metadata) is dict:
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for i in metadata:
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try:
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onionrvalues.BLOCK_METADATA_LENGTHS[i]
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except KeyError:
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logger.warn('Block has invalid metadata key ' + i)
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break
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else:
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testData = metadata[i]
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try:
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testData = len(testData)
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except (TypeError, AttributeError) as e:
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testData = len(str(testData))
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if onionrvalues.BLOCK_METADATA_LENGTHS[i] < testData:
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logger.warn('Block metadata key ' + i + ' exceeded maximum size')
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break
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if i == 'time':
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if not stringvalidators.is_integer_string(metadata[i]):
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logger.warn('Block metadata time stamp is not integer string or int')
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break
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isFuture = (metadata[i] - epoch.get_epoch())
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if isFuture > max_clock_difference:
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logger.warn('Block timestamp is skewed to the future over the max %s: %s' (max_clock_difference, isFuture))
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break
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if (epoch.get_epoch() - metadata[i]) > maxAge:
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logger.warn('Block is outdated: %s' % (metadata[i],))
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break
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elif i == 'expire':
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try:
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if not int(metadata[i]) > epoch.get_epoch(): raise ValueError
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except ValueError:
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logger.warn('Block is expired: %s less than %s' % (metadata[i], epoch.get_epoch()))
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break
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elif i == 'encryptType':
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try:
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if not metadata[i] in ('asym', 'sym', ''): raise ValueError
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except ValueError:
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logger.warn('Invalid encryption mode')
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break
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elif i == 'sig':
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try:
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metadata['encryptType']
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except KeyError:
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signer = metadata['signer']
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sig = metadata['sig']
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encodedMeta = bytesconverter.str_to_bytes(metadata['meta'])
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encodedBlock = bytesconverter.str_to_bytes(block_data)
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if not onionrcrypto.signing.ed_verify(encodedMeta + encodedBlock[1:], signer, sig):
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break
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else:
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# if metadata loop gets no errors, it does not break, therefore metadata is valid
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# make sure we do not have another block with the same data content (prevent data duplication and replay attacks)
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# Make sure time is set (validity was checked above if it is)
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try:
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metadata['time']
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except KeyError:
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return False
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nonce = bytesconverter.bytes_to_str(onionrcrypto.hashers.sha3_hash(block_data))
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try:
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with open(filepaths.data_nonce_file, 'r') as nonceFile:
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if nonce in nonceFile.read():
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# we've seen that nonce before, so we can't pass metadata
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raise onionrexceptions.DataExists
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except FileNotFoundError:
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ret_data = True
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except onionrexceptions.DataExists:
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# do not set ret_data to True, because data has been seen before
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logger.warn(f'{nonce} seen before')
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raise onionrexceptions.DataExists
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else:
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ret_data = True
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else:
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logger.warn('In call to utils.validateMetadata, metadata must be JSON string or a dictionary object')
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return ret_data</code></pre>
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</details>
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</section>
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<section>
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</section>
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<section>
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</section>
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<section>
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<h2 class="section-title" id="header-functions">Functions</h2>
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<dl>
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<dt id="onionr.onionrutils.validatemetadata.validate_metadata"><code class="name flex">
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<span>def <span class="ident">validate_metadata</span></span>(<span>metadata, block_data)</span>
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</code></dt>
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<dd>
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<section class="desc"><p>Validate metadata meets onionr spec (does not validate proof value computation), take in either dictionary or json string</p></section>
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<details class="source">
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<summary>Source code</summary>
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<pre><code class="python">def validate_metadata(metadata, block_data) -> bool:
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'''Validate metadata meets onionr spec (does not validate proof value computation), take in either dictionary or json string'''
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ret_data = False
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max_clock_difference = onionrvalues.MAX_BLOCK_CLOCK_SKEW
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# convert to dict if it is json string
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if type(metadata) is str:
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try:
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metadata = json.loads(metadata)
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except json.JSONDecodeError:
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pass
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# Validate metadata dict for invalid keys to sizes that are too large
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maxAge = min(config.get("general.max_block_age", onionrvalues.DEFAULT_EXPIRE), onionrvalues.DEFAULT_EXPIRE)
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if type(metadata) is dict:
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for i in metadata:
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try:
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onionrvalues.BLOCK_METADATA_LENGTHS[i]
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except KeyError:
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logger.warn('Block has invalid metadata key ' + i)
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break
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else:
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testData = metadata[i]
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try:
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testData = len(testData)
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except (TypeError, AttributeError) as e:
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testData = len(str(testData))
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if onionrvalues.BLOCK_METADATA_LENGTHS[i] < testData:
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logger.warn('Block metadata key ' + i + ' exceeded maximum size')
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break
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if i == 'time':
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if not stringvalidators.is_integer_string(metadata[i]):
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logger.warn('Block metadata time stamp is not integer string or int')
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break
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isFuture = (metadata[i] - epoch.get_epoch())
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if isFuture > max_clock_difference:
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logger.warn('Block timestamp is skewed to the future over the max %s: %s' (max_clock_difference, isFuture))
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break
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if (epoch.get_epoch() - metadata[i]) > maxAge:
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logger.warn('Block is outdated: %s' % (metadata[i],))
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break
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elif i == 'expire':
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try:
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if not int(metadata[i]) > epoch.get_epoch(): raise ValueError
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except ValueError:
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logger.warn('Block is expired: %s less than %s' % (metadata[i], epoch.get_epoch()))
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break
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elif i == 'encryptType':
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try:
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if not metadata[i] in ('asym', 'sym', ''): raise ValueError
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except ValueError:
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logger.warn('Invalid encryption mode')
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break
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elif i == 'sig':
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try:
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metadata['encryptType']
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except KeyError:
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signer = metadata['signer']
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sig = metadata['sig']
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encodedMeta = bytesconverter.str_to_bytes(metadata['meta'])
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encodedBlock = bytesconverter.str_to_bytes(block_data)
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if not onionrcrypto.signing.ed_verify(encodedMeta + encodedBlock[1:], signer, sig):
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break
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else:
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# if metadata loop gets no errors, it does not break, therefore metadata is valid
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# make sure we do not have another block with the same data content (prevent data duplication and replay attacks)
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# Make sure time is set (validity was checked above if it is)
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try:
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metadata['time']
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except KeyError:
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return False
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nonce = bytesconverter.bytes_to_str(onionrcrypto.hashers.sha3_hash(block_data))
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try:
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with open(filepaths.data_nonce_file, 'r') as nonceFile:
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if nonce in nonceFile.read():
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# we've seen that nonce before, so we can't pass metadata
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raise onionrexceptions.DataExists
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except FileNotFoundError:
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ret_data = True
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except onionrexceptions.DataExists:
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# do not set ret_data to True, because data has been seen before
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logger.warn(f'{nonce} seen before')
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raise onionrexceptions.DataExists
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else:
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ret_data = True
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else:
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logger.warn('In call to utils.validateMetadata, metadata must be JSON string or a dictionary object')
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return ret_data</code></pre>
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</details>
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</dd>
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</dl>
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</section>
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<section>
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</section>
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</article>
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<nav id="sidebar">
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<h1>Index</h1>
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<div class="toc">
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<ul></ul>
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</div>
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<ul id="index">
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<li><h3>Super-module</h3>
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<ul>
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<li><code><a title="onionr.onionrutils" href="index.html">onionr.onionrutils</a></code></li>
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</ul>
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</li>
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<li><h3><a href="#header-functions">Functions</a></h3>
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<ul class="">
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<li><code><a title="onionr.onionrutils.validatemetadata.validate_metadata" href="#onionr.onionrutils.validatemetadata.validate_metadata">validate_metadata</a></code></li>
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</ul>
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</li>
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</ul>
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<p>Generated by <a href="https://pdoc3.github.io/pdoc"><cite>pdoc</cite> 0.6.3</a>.</p>
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