Add option to output failures only

certo/__main__.py

@@ -1,12 +1,13 @@
 """
 Usage:
-    certo [-vj] [-d DAYS|--days-to-expiration=DAYS] [-t SECONDS|--timeout=SECONDS] <hostnames>...
+    certo [-vjf] [-d DAYS|--days-to-expiration=DAYS] [-t SECONDS|--timeout=SECONDS] <hostnames>...
     certo -h | --help
 
 Options:
    -h --help                          Show this help.
    -j                                 Output in JSON format [default: False].
    -v                                 Increase verbosity [default: False].
+   -f --failonly                      Output failures only [default: False]
    -d DAYS --days-to-expiration=DAYS  Warn about near expiration if within DAYS of the cert's notAfter [default: 5].
    -t SECONDS --timeout=SECONDS       Timeout for SSL Handshake [default: 5].
 """
@@ -23,6 +24,7 @@ async def main():
     args = docopt(__doc__)
 
     output_as_json = args.get("-j")
+    output_passes = not args.get("--failonly")
     if args.get("-v"):
         logging.getLogger().setLevel(logging.INFO)
     hostnames = args.get("<hostnames>")
@@ -30,9 +32,9 @@ async def main():
 
     # @todo factory
     if output_as_json:
-        reporter = JSONReporter()
+        reporter = JSONReporter(output_passes)
     else:
-        reporter = DefaultReporter()
+        reporter = DefaultReporter(output_passes)
 
     jobs = {
         check_host_certificate_expiration(hs, days_to_expiration) for hs in hostnames

certo/report.py

@@ -2,8 +2,9 @@ import json
 
 
 class CheckReporter:
-    def __init__(self):
+    def __init__(self, output_passes):
         self.checks = list()
+        self.output_passes = output_passes
 
     def append(self, check):
         self.checks.append(check)
@@ -35,7 +36,7 @@ class JSONReporter(CheckReporter):
             list(
                 map(
                     lambda check: JSONReporter.__make_check_serialisable(check),
-                    self.checks,
+                    self.checks if self.output_passes else self.failed(),
                 )
             ),
             indent=4,
@@ -45,6 +46,8 @@ class JSONReporter(CheckReporter):
 class DefaultReporter(CheckReporter):
     def append(self, check):
         super().append(check)
+        if check.check_successful and not self.output_passes:
+            return
         result = f"[{'PASS' if check.check_successful else 'FAIL'}] Check host {check.hostname}"
         if check.debug:
             result += f" - {check.debug}"