Module src.onionrutils.blockmetadata.process

'''
    Onionr - Private P2P Communication

    Process block metadata with relevant actions
'''
'''
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
'''

from etc import onionrvalues
from onionrblocks import onionrblockapi
from .. import epoch, bytesconverter
from coredb import blockmetadb
import logger
from onionrplugins import onionrevents
import onionrexceptions
from onionrusers import onionrusers
from onionrutils import updater

def process_block_metadata(blockHash: str):
    '''
        Read metadata from a block and cache it to the block database
        
        blockHash -> sha3_256 hex formatted hash of Onionr block
    '''
    curTime = epoch.get_rounded_epoch(roundS=60)
    myBlock = onionrblockapi.Block(blockHash)
    if myBlock.isEncrypted:
        myBlock.decrypt()
    if (myBlock.isEncrypted and myBlock.decrypted) or (not myBlock.isEncrypted):
        blockType = myBlock.getMetadata('type') # we would use myBlock.getType() here, but it is bugged with encrypted blocks

        signer = bytesconverter.bytes_to_str(myBlock.signer)
        valid = myBlock.verifySig()
        if valid:
            if myBlock.getMetadata('newFSKey') is not None:
                try:
                    onionrusers.OnionrUser(signer).addForwardKey(myBlock.getMetadata('newFSKey'))
                except onionrexceptions.InvalidPubkey:
                    logger.warn('%s has invalid forward secrecy key to add: %s' % (signer, myBlock.getMetadata('newFSKey')))
            
        try:
            if len(blockType) <= onionrvalues.MAX_BLOCK_TYPE_LENGTH:
                blockmetadb.update_block_info(blockHash, 'dataType', blockType)
        except TypeError:
            logger.warn("Missing block information")
            pass
        # Set block expire time if specified
        try:
            expireTime = int(myBlock.getHeader('expire'))
            # test that expire time is an integer of sane length (for epoch)
            # doesn't matter if its too large because of the min() func below
            if not len(str(expireTime)) < 20: raise ValueError('timestamp invalid')
        except (ValueError, TypeError) as e:
            expireTime = onionrvalues.DEFAULT_EXPIRE + curTime
        finally:
            expireTime = min(expireTime, curTime + onionrvalues.DEFAULT_EXPIRE)
            blockmetadb.update_block_info(blockHash, 'expire', expireTime)

        if blockType == 'update': updater.update_event(myBlock)
        onionrevents.event('processblocks', data = {'block': myBlock, 'type': blockType, 'signer': signer, 'validSig': valid})