Add support for files in ftp servers

tap_spreadsheets_anywhere/file_utils.py

@@ -13,6 +13,7 @@
 import tap_spreadsheets_anywhere.format_handler
 import tap_spreadsheets_anywhere.conversion as conversion
 import smart_open.ssh as ssh_transport
+import smart_open.ftp as ftp_transport
 
 LOGGER = logging.getLogger(__name__)
 
@@ -27,6 +28,14 @@ def resolve_target_uri(table_spec, target_filename):
         return table_spec['path'] + "/" + target_filename
 
 
+def _hide_credentials(path):
+    import re
+    if path.startswith('sftp'):
+        return re.sub('sftp://.*?@', "", path, flags=re.DOTALL)
+    elif path.startswith('ftp'):
+        return re.sub('ftp://.*?@', "", path, flags=re.DOTALL)
+    return path
+
 
 def write_file(target_filename, table_spec, schema, max_records=-1):
     LOGGER.info('Syncing file "{}".'.format(target_filename))
@@ -36,7 +45,7 @@ def write_file(target_filename, table_spec, schema, max_records=-1):
         iterator = tap_spreadsheets_anywhere.format_handler.get_row_iterator(table_spec, target_uri)
         for row in iterator:
             metadata = {
-                '_smart_source_bucket': table_spec['path'],
+                '_smart_source_bucket': _hide_credentials(table_spec['path']),
                 '_smart_source_file': target_filename,
                 # index zero, +1 for header row
                 '_smart_source_lineno': records_synced + 2
@@ -122,6 +131,8 @@ def get_matching_objects(table_spec, modified_since=None):
         target_objects = list_files_in_local_bucket(bucket, table_spec.get('search_prefix'))
     elif protocol in ["sftp"]:
         target_objects = list_files_in_SSH_bucket(table_spec['path'],table_spec.get('search_prefix'))
+    elif protocol in ["ftp"]:
+        target_objects = list_files_in_ftp_server(table_spec['path'],table_spec.get('search_prefix'))
     elif protocol in ["gs"]:
         target_objects = list_files_in_gs_bucket(bucket,table_spec.get('search_prefix'))
     elif protocol in ["http", "https"]:
@@ -210,6 +221,27 @@ def convert_URL_to_file_list(table_spec):
         raise ValueError(f"Configured URL {url} could not be read.")
 
 
+def list_files_in_ftp_server(uri, search_prefix=None):
+    parsed_uri = ftp_transport.parse_uri(uri)
+    uri_path = parsed_uri.pop('uri_path')
+    secure_conn = True if parsed_uri["scheme"] == "ftps" else False
+    ftp = ftp_transport._connect(parsed_uri['host'], parsed_uri['user'], parsed_uri['port'], parsed_uri['password'], secure_conn, transport_params={})
+    entries = []
+    max_results = 10000
+    from stat import S_ISREG
+    import fnmatch
+    for row in ftp.mlsd(uri_path):
+        if search_prefix is None or fnmatch.fnmatch(entry[0],search_prefix):
+            if row[1]['type'] == 'file':
+                entries.append({'Key':row[0],'LastModified':datetime.strptime(row[1]['modify'], '%Y%m%d%H%M%S').replace(tzinfo=timezone.utc)})
+            if len(entries) > max_results:
+                raise print(f"Read more than {max_results} records from the path {uri_path}. Use a more specific "
+                             f"search_prefix")
+
+    LOGGER.info("Found {} files.".format(entries))
+    return entries
+
+
 def list_files_in_local_bucket(bucket, search_prefix=None):
     local_filenames = []
     path = bucket