validate_login() to silently validate user credentials

bootstrap.py

@@ -469,11 +469,17 @@ def http_error_206(self, request, response, code, msg, hdrs):
         return response
 
 
-def call_api(url, data=None, method='GET'):
+def call_api(url, data=None, method='GET', no_verify_ssl=False, silent=False):
     """
     Helper function to place an API call returning JSON results and doing
     some error handling. Any error results in an exit.
     """
+    if sys.version_info >= (2,7) and no_verify_ssl:
+        # import the ssl module only when on Python 2.7
+        import ssl
+        ssl_context = ssl._create_unverified_context()
+    else:
+        ssl_context = None
     try:
         request = urllib2.Request(url)
         if options.verbose:
@@ -487,23 +493,27 @@ def call_api(url, data=None, method='GET'):
         if data:
             request.add_data(json.dumps(data))
         request.get_method = lambda: method
-        result = urllib2.urlopen(request)
+        if ssl_context:
+            result = urllib2.urlopen(request, context=ssl_context)
+        else:
+            result = urllib2.urlopen(request)
         jsonresult = json.load(result)
         if options.verbose:
             print 'result: %s' % json.dumps(jsonresult, sort_keys=False, indent=2)
         return jsonresult
     except urllib2.URLError, e:
-        print 'An error occured: %s' % e
-        print 'url: %s' % url
-        if isinstance(e, urllib2.HTTPError):
-            print 'code: %s' % e.code
-        if data:
-            print 'data: %s' % json.dumps(data, sort_keys=False, indent=2)
-        try:
-            jsonerr = json.load(e)
-            print 'error: %s' % json.dumps(jsonerr, sort_keys=False, indent=2)
-        except:
-            print 'error: %s' % e
+        if not silent:
+            print 'An error occured: %s' % e
+            print 'url: %s' % url
+            if isinstance(e, urllib2.HTTPError):
+                print 'code: %s' % e.code
+            if data:
+                print 'data: %s' % json.dumps(data, sort_keys=False, indent=2)
+            try:
+                jsonerr = json.load(e)
+                print 'error: %s' % json.dumps(jsonerr, sort_keys=False, indent=2)
+            except:
+                print 'error: %s' % e
         sys.exit(1)
     except Exception, e:
         print "FATAL Error - %s" % (e)
@@ -768,6 +778,21 @@ class MEOptions:
     # cleanup
     disable_rhn_plugin()
 
+def validate_login():
+    """
+    Function to authenticate a user to validate login credentials before
+    running any other API calls. Strip down output so it doesn't print a
+    big exception and scare users. This function is going to be used
+    before we have the certificates from katello-consumer rpm installed,
+    so we need to disable SSL verification since it's now enabled
+    per default in RHEL7.4+.
+    """
+    myurl = "https://" + options.sat6_ip + ":" + API_PORT + "/api/v2/organizations/"
+    try:
+        jsonresult=call_api(myurl,no_verify_ssl=True,silent=True)
+    except:
+        print "ERROR, could not authenticate username. Please try again."
+        sys.exit(2)
 
 def enable_service(service, failonerror=True):
     """
@@ -1013,6 +1038,8 @@ def exec_service(service, command, failonerror=True):
     # > Clean the environment from LD_... variables
     clean_environment()
 
+    validate_login()
+
     # > IF RHEL 5 and not removing, prepare the migration.
     if not options.remove and int(RELEASE[0]) == 5:
         prepare_rhel5_migration()