Create Domain Audit File Option

Allows for the creation of an audit file that will explain for each domain the number of matches across available sources

etc/sample.fediblockhole.conf.toml

@@ -42,6 +42,9 @@ blocklist_instance_destinations = [
 ## File to save the fully merged blocklist into
 # blocklist_savefile = '/tmp/merged_blocklist.csv'
 
+## File to save the audit log of counts across sources
+# blocklist_auditfile = '/tmp/domain_counts_list.csv'
+
 ## Don't push blocklist to instances, even if they're defined above
 # no_push_instance = false
 

src/fediblockhole/__init__.py

@@ -11,8 +11,8 @@ import os.path
 import sys
 import urllib.request as urlr
 
-from .blocklists import Blocklist, parse_blocklist
-from .const import DomainBlock, BlockSeverity
+from .blocklists import Blocklist, BlockAuditList, parse_blocklist
+from .const import DomainBlock, BlockSeverity, BlockAudit
 
 from importlib.metadata import version
 __version__ = version('fediblockhole')
@@ -71,7 +71,7 @@ def sync_blocklists(conf: argparse.Namespace):
             import_fields, conf.save_intermediate, conf.savedir, export_fields))
 
     # Merge blocklists into an update dict
-    merged = merge_blocklists(blocklists, conf.mergeplan, conf.merge_threshold, conf.merge_threshold_type)
+    merged = merge_blocklists(blocklists, conf.mergeplan, conf.merge_threshold, conf.merge_threshold_type, conf.blocklist_auditfile)
 
     # Remove items listed in allowlists, if any
     allowlists = fetch_allowlists(conf)
@@ -183,7 +183,8 @@ def fetch_from_instances(sources: dict,
 
 def merge_blocklists(blocklists: list[Blocklist], mergeplan: str='max',
     threshold: int=0,
-    threshold_type: str='count') -> Blocklist:
+    threshold_type: str='count',
+    save_block_audit_file: str='') -> Blocklist:
     """Merge fetched remote blocklists into a bulk update
     @param blocklists: A dict of lists of DomainBlocks, keyed by source.
         Each value is a list of DomainBlocks
@@ -201,6 +202,7 @@ def merge_blocklists(blocklists: list[Blocklist], mergeplan: str='max',
     @param returns: A dict of DomainBlocks keyed by domain
     """
     merged = Blocklist('fediblockhole.merge_blocklists')
+    audit = BlockAuditList('fediblockhole.merge_blocklists')
 
     num_blocklists = len(blocklists)
 
@@ -219,10 +221,12 @@ def merge_blocklists(blocklists: list[Blocklist], mergeplan: str='max',
 
     # Only merge items if `threshold` is met or exceeded
     for domain in domain_blocks:
+        domain_matches_count = len(domain_blocks[domain])
+        domain_matches_percent = domain_matches_count / num_blocklists * 100
         if threshold_type == 'count':
-            domain_threshold_level = len(domain_blocks[domain])
+            domain_threshold_level = domain_matches_count
         elif threshold_type == 'pct':
-            domain_threshold_level = len(domain_blocks[domain]) / num_blocklists * 100
+            domain_threshold_level = domain_matches_percent
             # log.debug(f"domain threshold level: {domain_threshold_level}")
         else:
             raise ValueError(f"Unsupported threshold type '{threshold_type}'. Supported values are: 'count', 'pct'")
@@ -238,6 +242,18 @@ def merge_blocklists(blocklists: list[Blocklist], mergeplan: str='max',
                 block = apply_mergeplan(block, newblock, mergeplan)
             merged.blocks[block.domain] = block
 
+        if len(save_block_audit_file) > 0:
+            blockdata:BlockAudit = {
+                'domain': domain,
+                'count': domain_matches_count, 
+                'percent': domain_matches_percent,
+            }
+            audit.blocks[domain] = blockdata
+
+    if len(save_block_audit_file) > 0:
+        log.info(f"Saving audit file to {save_block_audit_file}")
+        save_domain_block_audit_to_file(audit, save_block_audit_file)
+
     return merged
 
 def apply_mergeplan(oldblock: DomainBlock, newblock: DomainBlock, mergeplan: str='max') -> dict:
@@ -672,6 +688,34 @@ def save_blocklist_to_file(
         for key, value in sorted_list:
             writer.writerow(value)
 
+def save_domain_block_audit_to_file(
+    blocklist: BlockAuditList,
+    filepath: str):
+    """Save an audit log of domains blocked
+
+    @param blocklist: A dictionary of block definitions, keyed by domain
+    @param filepath: The path to the file the list should be saved in.
+    """
+    export_fields = ['domain', 'count', 'percent']
+
+    try:
+        sorted_list = sorted(blocklist.blocks.items())
+    except KeyError:
+        log.error("Field 'domain' not found in blocklist.")
+        log.debug(f"blocklist is: {sorted_list}")
+    except AttributeError:
+        log.error("Attribute error!")
+        import pdb
+        pdb.set_trace()
+
+    log.debug("exporting audit file")
+
+    with open(filepath, "w") as fp:
+        writer = csv.DictWriter(fp, export_fields, extrasaction='ignore')
+        writer.writeheader()
+        for key, value in sorted_list:
+            writer.writerow(value)
+
 def augment_args(args, tomldata: str=None):
     """Augment commandline arguments with config file parameters
     
@@ -701,6 +745,9 @@ def augment_args(args, tomldata: str=None):
     if not args.savedir:
         args.savedir = conf.get('savedir', '/tmp')
 
+    if not args.blocklist_auditfile:
+        args.blocklist_auditfile = conf.get('blocklist_auditfile', '')
+
     if not args.export_fields:
         args.export_fields = conf.get('export_fields', [])
 
@@ -737,6 +784,7 @@ def setup_argparse():
     ap.add_argument('-S', '--save-intermediate', dest="save_intermediate", action='store_true', help="Save intermediate blocklists we fetch to local files.")
     ap.add_argument('-D', '--savedir', dest="savedir", help="Directory path to save intermediate lists.")
     ap.add_argument('-m', '--mergeplan', choices=['min', 'max'], help="Set mergeplan.")
+    ap.add_argument('-b', '--block-audit-file', dest="blocklist_auditfile", help="Save blocklist auditfile to this location.")
     ap.add_argument('--merge-threshold', type=int, help="Merge threshold value")
     ap.add_argument('--merge-threshold-type', choices=['count', 'pct'], help="Type of merge threshold to use.")
 

src/fediblockhole/blocklists.py

@@ -6,7 +6,7 @@ import json
 from typing import Iterable
 from dataclasses import dataclass, field
 
-from .const import DomainBlock, BlockSeverity
+from .const import DomainBlock, BlockSeverity, BlockAudit
 
 import logging
 log = logging.getLogger('fediblockhole')
@@ -38,6 +38,33 @@ class Blocklist:
     def values(self):
         return self.blocks.values()
 
+@dataclass   
+class BlockAuditList:
+    """ A BlockAuditlist object
+
+    A BlockAuditlist is a list of BlockAudits from an origin
+    """
+    origin: str = None
+    blocks: dict[str, BlockAudit] = field(default_factory=dict)
+
+    def __len__(self):
+        return len(self.blocks)
+
+    def __class_getitem__(cls, item):
+        return dict[str, BlockAudit]
+
+    def __getitem__(self, item):
+        return self.blocks[item]
+
+    def __iter__(self):
+        return self.blocks.__iter__()
+
+    def items(self):
+        return self.blocks.items()
+
+    def values(self):
+        return self.blocks.values()
+
 class BlocklistParser(object):
     """
     Base class for parsing blocklists

src/fediblockhole/const.py

@@ -85,6 +85,81 @@ class BlockSeverity(object):
         if self._level >= other._level:
             return True
         
+class BlockAudit(object):
+
+    fields = [
+        'domain',
+        'count',
+        'percent',
+    ]
+
+    all_fields = [
+        'domain',
+        'count',
+        'percent',
+        'id'
+    ]
+
+    def __init__(self, domain:str,
+            count: int=0,
+            percent: int=0,
+            id: int=None):
+        """Initialize the BlockAudit
+        """        
+        self.domain = domain
+        self.count = count
+        self.percent = percent
+        self.id = id
+
+    def _asdict(self):
+        """Return a dict version of this object
+        """
+        dictval = {
+            'domain': self.domain,
+            'count': self.count,
+            'percent': self.percent,
+        }
+        if self.id:
+            dictval['id'] = self.id
+
+        return dictval
+
+    def __repr__(self):
+
+        return f"<BlockAudit {self._asdict()}>"
+
+    def copy(self):
+        """Make a copy of this object and return it
+        """
+        retval = BlockAudit(**self._asdict())
+        return retval
+
+    def update(self, dict):
+        """Update my kwargs
+        """
+        for key in dict:
+            setattr(self, key, dict[key])
+
+    def __iter__(self):
+        """Be iterable"""
+        keys = self.fields
+
+        if getattr(self, 'id', False):
+            keys.append('id')
+
+        for k in keys:
+            yield k
+
+    def __getitem__(self, k, default=None):
+        "Behave like a dict for getting values"
+        if k not in self.all_fields:
+            raise KeyError(f"Invalid key '{k}'")
+
+        return getattr(self, k, default)
+
+    def get(self, k, default=None):
+        return self.__getitem__(k, default)
+
 # class _DomainBlock(NamedTuple):
 #     domain: str # FIXME: Use an actual Domain object from somewhere?
 #     severity: BlockSeverity = BlockSeverity.SUSPEND