Show more details about the failing reason of an import

When importing a vcf file exported by the google calendar app on android the contacts app opens the import windows, and closes it again immediately afterwards. Nothing was imported, no error messages given.

I guess the exported vcf file is in an invalid format, but even if I change it to a (I guess) valid format it fails silently on version 2.1. I would expect a message that this vcf version is not supported or that there is something wrong with the vcf format. In the best case also help for what to do.

To Reproduce
Import the vcard (invalid format):

BEGIN:VCARD
VERSION:2.1
N:;aatest;;;
FN:aatest
TEL;CELL:1
END:VCARD

or the vcard (with valid format):

BEGIN:VCARD
VERSION:2.1
N:;aatest;;;
FN:aatest
TEL;type=CELL:1
END:VCARD

When changing the version in the last vcard to 3.0 it imports properly.

Expected behavior
The contacts app should display an error message that the vcard couldn't be imported and state the reason for that (Invalid format or old vcard version).

Actual behavior
The importing dialog opens and closes immediately afterwards, nothing can be seen there.

Server configuration

Operating system: Linux

Web server: Apache

Database: MariaDB

PHP version: 7.2

Nextcloud version: 15.0.5

Contacts version: 3.0.5

Updated from an older Nextcloud or fresh install:
Updated from an older nc instance

Signing status:

No errors have been found.

List of activated apps:

Enabled:
  - accessibility: 1.1.0
  - activity: 2.8.2
  - calendar: 1.6.4
  - cloud_federation_api: 0.1.0
  - comments: 1.5.0
  - contacts: 3.0.5
  - dav: 1.8.1
  - federatedfilesharing: 1.5.0
  - federation: 1.5.0
  - files: 1.10.0
  - files_external: 1.6.0
  - files_pdfviewer: 1.4.0
  - files_sharing: 1.7.0
  - files_texteditor: 2.7.0
  - files_trashbin: 1.5.0
  - files_versions: 1.8.0
  - files_videoplayer: 1.4.0
  - firstrunwizard: 2.4.0
  - gallery: 18.2.0
  - logreader: 2.0.0
  - lookup_server_connector: 1.3.0
  - nextcloud_announcements: 1.4.0
  - notes: 2.5.1
  - notifications: 2.3.0
  - oauth2: 1.3.0
  - password_policy: 1.5.0
  - polls: 0.10.1
  - provisioning_api: 1.5.0
  - serverinfo: 1.5.0
  - sharebymail: 1.5.0
  - support: 1.0.0
  - survey_client: 1.3.0
  - systemtags: 1.5.0
  - tasks: 0.9.8
  - theming: 1.6.0
  - twofactor_backupcodes: 1.4.1
  - updatenotification: 1.5.0
  - workflowengine: 1.5.0
Disabled:
  - admin_audit
  - audioplayer
  - bruteforcesettings
  - encryption
  - files_opds
  - spreed
  - user_ldap

Nextcloud configuration:

{
    "system": {
        "memcache.local": "\\OC\\Memcache\\APCu",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "***REMOVED SENSITIVE VALUE***",
            "***REMOVED SENSITIVE VALUE***"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "overwrite.cli.url": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "15.0.5.3",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "logtimezone": "UTC",
        "installed": true,
        "maintenance": false,
        "loglevel": 2,
        "enabledPreviewProviders": [
            "OC\\Preview\\Image",
            "OC\\Preview\\MP3",
            "OC\\Preview\\TXT",
            "OC\\Preview\\MarkDown",
            "OC\\Preview\\Epub",
            "OC\\Preview\\PDF"
        ],
        "theme": "",
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "updater.release.channel": "stable"
    }
}

Client configuration

Browser:
Googel Chrome 72.0.3626.121

Operating system:
Windows 10

CardDAV-clients:
DAVDroid

Logs

Web server error log

nothing related

Nextcloud log

data/nextcloud.log

{"reqId":"id","level":4,"time":"2019-03-11T20:16:57+00:00","remoteAddr":"","user":"user","app":"webdav","method":"PUT","url":"\/nextcloud\/remote.php\/dav\/addressbooks\/users\/user\/contacts\/D37730C8-09FC-4CAF-A56C-79E45D583894.vcf","message":{"Exception":"Sabre\\DAV\\Exception\\UnsupportedMediaType","Message":"Validation error in vCard: CardDAV servers are not allowed to accept vCard 2.1.","Code":0,"Trace":[{"file":"\/var\/www\/nextcloud\/3rdparty\/sabre\/dav\/lib\/CardDAV\/Plugin.php","line":316,"function":"validateVCard","class":"Sabre\\CardDAV\\Plugin","type":"->","args":["BEGIN:VCARD\r\nVERSION:2.1\r\nN:;aatest;;;\r\nFN:aatest\r\nTEL;TYPE=CELL:1\r\nUID:06794743-1652-4fe5-9db3-2a38f15d797d\r\nREV:20190311T201657Z\r\nEND:VCARD\r\n",false]},{"function":"beforeCreateFile","class":"Sabre\\CardDAV\\Plugin","type":"->","args":["addressbooks\/users\/user\/contacts\/D37730C8-09FC-4CAF-A56C-79E45D583894.vcf","BEGIN:VCARD\r\nVERSION:2.1\r\nN:;aatest;;;\r\nFN:aatest\r\nTEL;TYPE=CELL:1\r\nUID:06794743-1652-4fe5-9db3-2a38f15d797d\r\nREV:20190311T201657Z\r\nEND:VCARD\r\n",{"__class__":"OCA\\DAV\\CardDAV\\AddressBook"},false]},{"file":"\/var\/www\/nextcloud\/3rdparty\/sabre\/event\/lib\/EventEmitterTrait.php","line":105,"function":"call_user_func_array","args":[[{"directories":[],"__class__":"OCA\\DAV\\CardDAV\\Plugin"},"beforeCreateFile"],["addressbooks\/users\/user\/contacts\/D37730C8-09FC-4CAF-A56C-79E45D583894.vcf","BEGIN:VCARD\r\nVERSION:2.1\r\nN:;aatest;;;\r\nFN:aatest\r\nTEL;TYPE=CELL:1\r\nUID:06794743-1652-4fe5-9db3-2a38f15d797d\r\nREV:20190311T201657Z\r\nEND:VCARD\r\n",{"__class__":"OCA\\DAV\\CardDAV\\AddressBook"},false]]},{"file":"\/var\/www\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":1094,"function":"emit","class":"Sabre\\Event\\EventEmitter","type":"->","args":["beforeCreateFile",["addressbooks\/users\/user\/contacts\/D37730C8-09FC-4CAF-A56C-79E45D583894.vcf","BEGIN:VCARD\r\nVERSION:2.1\r\nN:;aatest;;;\r\nFN:aatest\r\nTEL;TYPE=CELL:1\r\nUID:06794743-1652-4fe5-9db3-2a38f15d797d\r\nREV:20190311T201657Z\r\nEND:VCARD\r\n",{"__class__":"OCA\\DAV\\CardDAV\\AddressBook"},false]]},{"file":"\/var\/www\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/CorePlugin.php","line":525,"function":"createFile","class":"Sabre\\DAV\\Server","type":"->","args":["addressbooks\/users\/user\/contacts\/D37730C8-09FC-4CAF-A56C-79E45D583894.vcf","BEGIN:VCARD\r\nVERSION:2.1\r\nN:;aatest;;;\r\nFN:aatest\r\nTEL;TYPE=CELL:1\r\nUID:06794743-1652-4fe5-9db3-2a38f15d797d\r\nREV:20190311T201657Z\r\nEND:VCARD\r\n",null]},{"function":"httpPut","class":"Sabre\\DAV\\CorePlugin","type":"->","args":[{"absoluteUrl":"https:\/\/lwtw.ddnss.de\/nextcloud\/remote.php\/dav\/addressbooks\/users\/user\/contacts\/D37730C8-09FC-4CAF-A56C-79E45D583894.vcf","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"\/var\/www\/nextcloud\/3rdparty\/sabre\/event\/lib\/EventEmitterTrait.php","line":105,"function":"call_user_func_array","args":[[{"__class__":"Sabre\\DAV\\CorePlugin"},"httpPut"],[{"absoluteUrl":"https:\/\/lwtw.ddnss.de\/nextcloud\/remote.php\/dav\/addressbooks\/users\/user\/contacts\/D37730C8-09FC-4CAF-A56C-79E45D583894.vcf","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]]},{"file":"\/var\/www\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":479,"function":"emit","class":"Sabre\\Event\\EventEmitter","type":"->","args":["method:PUT",[{"absoluteUrl":"https:\/\/lwtw.ddnss.de\/nextcloud\/remote.php\/dav\/addressbooks\/users\/user\/contacts\/D37730C8-09FC-4CAF-A56C-79E45D583894.vcf","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]]},{"file":"\/var\/www\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":254,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->","args":[{"absoluteUrl":"https:\/\/lwtw.ddnss.de\/nextcloud\/remote.php\/dav\/addressbooks\/users\/user\/contacts\/D37730C8-09FC-4CAF-A56C-79E45D583894.vcf","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"\/var\/www\/nextcloud\/apps\/dav\/lib\/Server.php","line":301,"function":"exec","class":"Sabre\\DAV\\Server","type":"->","args":[]},{"file":"\/var\/www\/nextcloud\/apps\/dav\/appinfo\/v2\/remote.php","line":35,"function":"exec","class":"OCA\\DAV\\Server","type":"->","args":[]},{"file":"\/var\/www\/nextcloud\/remote.php","line":163,"args":["\/var\/www\/nextcloud\/apps\/dav\/appinfo\/v2\/remote.php"],"function":"require_once"}],"File":"\/var\/www\/nextcloud\/3rdparty\/sabre\/dav\/lib\/CardDAV\/Plugin.php","Line":397,"CustomMessage":"--"},"userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/72.0.3626.121 Safari\/537.36","version":"15.0.5.3"}

Browser log

For the vcard with a valid format and a wrong version

PUT https://*/nextcloud/remote.php/dav/addressbooks/users/*/contacts/20895E5E-D8FA-4800-B81B-A0B120129501.vcf 415 (Unsupported Media Type)
Error
    at XMLHttpRequest.s.onreadystatechange (dist.js:1)

For the vcard with a invalid format and a wrong version

parseVcf.js:47
r {message: "Invalid parameters in 'TEL;CELL:1'", name: "ParserError", stack: "    at new r (https://*/nextcloud/apps…apps/contacts/js/contacts.js?v=728b7e97-5:91:5652"}
message: "Invalid parameters in 'TEL;CELL:1'"
name: "ParserError"
stack: "    at new r (https://*/nextcloud/apps/contacts/js/contacts.js?v=728b7e97-5:7:79789)↵    at Function.i._handleContentLine (https://*/nextcloud/apps/contacts/js/contacts.js?v=728b7e97-5:7:80550)↵    at https://*/nextcloud/apps/contacts/js/contacts.js?v=728b7e97-5:7:79967↵    at Function.i._eachLine (https://*/nextcloud/apps/contacts/js/contacts.js?v=728b7e97-5:7:83496)↵    at Object.i [as parse] (https://*/nextcloud/apps/contacts/js/contacts.js?v=728b7e97-5:7:79939)↵    at new t (https://*/nextcloud/apps/contacts/js/contacts.js?v=728b7e97-5:156:300)↵    at https://*/nextcloud/apps/contacts/js/contacts.js?v=728b7e97-5:69:241↵    at Array.reduce (<anonymous>)↵    at sn (https://*/nextcloud/apps/contacts/js/contacts.js?v=728b7e97-5:69:210)↵    at https://*/nextcloud/apps/contacts/js/contacts.js?v=728b7e97-5:91:5652"
__proto__: Object

---

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Start with the import flow around parseVcf.js:47 and the contacts.js code shown in the browser stack traces, then inspect how the PUT response from the DAV endpoint is handled. Reproduce both vCard examples and preserve the parser error and 415 response reason in a visible import error; done means the dialog no longer closes silently.