0.9.0.4 contacts syncing regression / Exception

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    Hi,
    syncing my contacts (sabredav 3.0.5 on the server side) results in the following exception:

    java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.squareup.okhttp.HttpUrl.host()' on a null object reference
	at at.bitfire.davdroid.syncadapter.ContactsSyncManager$ResourceDownloader.download(ContactsSyncManager.java:267)
	at at.bitfire.vcard4android.Contact.fromVCard(Contact.java:279)
	at at.bitfire.vcard4android.Contact.fromStream(Contact.java:143)
	at at.bitfire.davdroid.syncadapter.ContactsSyncManager.processVCard(ContactsSyncManager.java:235)
	at at.bitfire.davdroid.syncadapter.ContactsSyncManager.downloadRemote(ContactsSyncManager.java:200)
	at at.bitfire.davdroid.syncadapter.SyncManager.performSync(SyncManager.java:179)
	at at.bitfire.davdroid.syncadapter.ContactsSyncAdapterService$ContactsSyncAdapter.onPerformSync(ContactsSyncAdapterService.java:52)
	at android.content.AbstractThreadedSyncAdapter$SyncThread.run(AbstractThreadedSyncAdapter.java:259)
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.squareup.okhttp.HttpUrl.host()' on a null object reference
	at at.bitfire.davdroid.syncadapter.ContactsSyncManager$ResourceDownloader.download(ContactsSyncManager.java:267)
	at at.bitfire.vcard4android.Contact.fromVCard(Contact.java:279)
	at at.bitfire.vcard4android.Contact.fromStream(Contact.java:143)
	at at.bitfire.davdroid.syncadapter.ContactsSyncManager.processVCard(ContactsSyncManager.java:235)
	at at.bitfire.davdroid.syncadapter.ContactsSyncManager.downloadRemote(ContactsSyncManager.java:200)
	at at.bitfire.davdroid.syncadapter.SyncManager.performSync(SyncManager.java:179)
	at at.bitfire.davdroid.syncadapter.ContactsSyncAdapterService$ContactsSyncAdapter.onPerformSync(ContactsSyncAdapterService.java:52)
	at android.content.AbstractThreadedSyncAdapter$SyncThread.run(AbstractThreadedSyncAdapter.java:259)

    This is the debug output before the exception happens(anonymized):

    [debug] Received <response> for https://xxx/sabredav/addressbooks/xxx/default/cf6abf80-c6e9-4f7b-82ae-1f86c842d8a2.vcf, status: null, properties: [address-data(urn:ietf:params:xml:ns:carddav): AddressData(vCard=BEGIN:VCARD
VERSION:4.0
PRODID:-//Sabre//Sabre VObject 3.4.7//EN
N:aaa;aaa;;;
FN:aaa
EMAIL;TYPE=INTERNET,WORK;PREF=1:aaa@aaa.eu
EMAIL;TYPE=INTERNET,WORK:aa2@aaa.eu
EMAIL;TYPE=INTERNET,HOME:aaaa@aaa.eu
ITEM2.ADR;TYPE=HOME;PREF=1:;;street 43a;city;;zip;Deutschland
ITEM3.URL;PREF=1:http://www.asdf.de
URL;TYPE=WORK:http://www.asg.de
URL;TYPE=WORK:http://www.afgasd.eu
BDAY;VALUE=DATE:1993-02-12
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 QvHzC6CftQgHgepGy+6zSUgWAiAAyJAxWUy4LGNTWGkquMyRlHtVp1ysr2LgCgFOptFSL69fL8
 fWVMvzr/HWcPHkWMfHDYO/ghP6ugXib/jY4fOJL5NNP6x60Jie3QLhFpwvzvHkc/iICBlNISMW
 QWTYsITAAKR7jeWw+Yi6LIoBKr8QZ4n+K8u57eIXSz9tr8clnNwlArQKgpE6opKxOACgjA2xOH
 97UFjDItBL20rySAqLNAGisvJyioKIet8l8cTGF/40qAeDcvwnAiXOYv2CJeFUmwp7+B+uOvR/
 j5JlrmJtPvwfqUiGEftVi83oA0mwC7TiLDcu6cankkAKCNXDyWvSkvO/l4AoXyrPM7CU488k1n
 Dz9NR2CFAG36nCruFZEwO3bdUJsQuSzLtyrqrTK4UdngMxtzm+9eZrH82UK8PVi9+mAvXq9El9
 +VYazn1/D8ZPnsP8AnUeh9P+W6S1R736eyJv7Pk59cBkff16E5JR0sUbXCHpnIM6x45QCdAgm5
 Z+B1JAlH4l64uIPW4QgocTSe8Oejr7o08cVTk4+GDEqDR98dAUfn70mIIgI0AEoKVEAlJXRGcC
 7yHmsO+iUnFfCX58OOkDSuDGA4mIt/ZFVjWsUAQyA73ny9BciDTZs3Cq+GPXp5y4O4+OnLuKTc
 8U4cvoSQsOH0HeEQHAUhM1W0uB/ACKpxWLh1TQ5AAAAAElFTkSuQmCC
X-ICQ;TYPE=HOME;PREF=1:68769876
IMPP;X-SERVICE-TYPE=ICQ;TYPE=HOME;PREF=1:aim:987987
UID:6abae1b6-689c-4a8b-a951-b40af5083114
TEL;TYPE=CELL:+49 171 2394872
TEL;TYPE=HOME:0951/238
TEL;TYPE=WORK:0951/23423
REV:20140104T204251Z
END:VCARD
),
getcontenttype(DAV:): GetContentType(type=text/vcard; charset=utf-8),
getetag(DAV:): GetETag(eTag=1e32715262049e866d923f6760de022d)]

    This didn’t happen on 0.8 version IIRC.
    The exception happens on every sync.

    I am happy to provide further information to get this bug fixed.

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  • rfc2822
    developer

    Hello,

    Your PHOTO property is invalid. It must be a single URI. The content in your VCard iVBORw0KGgoAAAANSUhE… is not a valid URI. DAVdroid tries to download this URI (interpreting it as an URL) and fails because there’s no host name.

    If you use inline data for photos, please use a data URI.

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  • Y

    Hi,
    thanks for your fast answer and explanation.

    I just checked the vcf by hand, the actual PHOTO line looks like this:
    PHOTO;VALUE=uri:iVBORw0KGgoAAAANSUhEUgAAAEAAAABACAYAAACqaXHeAAAAAXNSR0IArs4c6
    The uri: part was missing in the logs.

    Anyway, this still doesn’t make it a valid URI (if I’m correct).
    I sadly don’t know which client set the PHOTO property like this, I can only say that it was done by a client and definitely not by hand.
    Would it be feasible to provide a workaround for cards which are created by clients with wrong PHOTO properties like this?
    Possible options that come to mind:

    • Only try to open URL with okhttp if it is a http or https URI
    • If it’s a invalid URI, guess the PHOTO URI type (this probably is base64 encoded jpeg in >95% of the times anyway)
    • If it’s a invalid URI, ignore the PHOTO property and don’t show a photo, but don’t crash the complete sync

    IIRC this exception didn’t occur with davdroid <0.9 and I think the picture of this contact was even shown correctly.

    rfc2822 1 Reply 0
  • rfc2822
    developer

    @yannik said:

    I just checked the vcf by hand, the actual PHOTO line looks like this:
    PHOTO;VALUE=uri:iVBORw0KGgoAAAANSUhEUgAAAEAAAABACAYAAACqaXHeAAAAAXNSR0IArs4c6
    The uri: part was missing in the logs.

    It probably wasn’t sent by the server because the default VALUE type is uri.

    Anyway, this still doesn’t make it a valid URI (if I’m correct).

    Indeed, PHOTO ; VALUE=uri : iVBORw0KGgo… (blanks added for clarification) just says that the content type is “uri”, which is the default.

    Would it be feasible to provide a workaround for cards which are created by clients with wrong PHOTO properties like this?
    Possible options that come to mind:

    • Only try to open URL with okhttp if it is a http or https URI
    • If it’s a invalid URI, guess the PHOTO URI type (this probably is base64 encoded jpeg in >95% of the times anyway)
    • If it’s a invalid URI, ignore the PHOTO property and don’t show a photo, but don’t crash the complete sync

    I’ll add this to our ever-growing “work around invalid responses and data” list.

    IIRC this exception didn’t occur with davdroid <0.9 and I think the picture of this contact was even shown correctly.

    I can’t imagine that. However, this is still clearly a server issue.

    Could you please report this to your server manufacturer? In my opinion, when the client should work around invalid data, the server should at least try not to send invalid data, too. While I agree with you that it would be nice if DAVdroid could be more resilient on such things, I still think it’s unfair to burden all the responsibility for invalid data to DAVdroid instead of the ones who generate such invalid data. It’s my life hours which go into dealing with invalid data just because somebody else didn’t do their homework…

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  • Y

    @rfc2822 said:

    @yannik said:

    I just checked the vcf by hand, the actual PHOTO line looks like this:
    PHOTO;VALUE=uri:iVBORw0KGgoAAAANSUhEUgAAAEAAAABACAYAAACqaXHeAAAAAXNSR0IArs4c6
    The uri: part was missing in the logs.

    It probably wasn’t sent by the server because the default VALUE type is uri.

    Anyway, this still doesn’t make it a valid URI (if I’m correct).

    Indeed, PHOTO ; VALUE=uri : iVBORw0KGgo… (blanks added for clarification) just says that the content type is “uri”, which is the default.

    This is so confusing.
    Leaving 3.0 aside, these are the different formats I could find in my own contacts by randomly checking a few:

    • PHOTO;VALUE=uri:http://domain.com/img.jpg
    • PHOTO:http://www.example.com/pub/photos/jqpublic.gif
    • PHOTO:data:image/jpeg;base64,/9j/4AAQSkZJR...
    • PHOTO;TYPE=image/png:data:application/octet-stream;base64,iVBORw0KG...

    Some prepend VALUE=, others prependTYPE=, some add uri: in front of the uri, others just have the uri. Are these all valid or do they just work due to workarounds?

    Would it be feasible to provide a workaround for cards which are created by clients with wrong PHOTO properties like this?
    Possible options that come to mind:

    • Only try to open URL with okhttp if it is a http or https URI
    • If it’s a invalid URI, guess the PHOTO URI type (this probably is base64 encoded jpeg in >95% of the times anyway)
    • If it’s a invalid URI, ignore the PHOTO property and don’t show a photo, but don’t crash the complete sync

    I’ll add this to our ever-growing “work around invalid responses and data” list.

    Thanks! Which option is the one that you would want to see implemented?

    I can’t imagine that. However, this is still clearly a server issue.

    Could you please report this to your server manufacturer? In my opinion, when the client should work around invalid data, the server should at least try not to send invalid data, too. While I agree with you that it would be nice if DAVdroid could be more resilient on such things, I still think it’s unfair to burden all the responsibility for invalid data to DAVdroid instead of the ones who generate such invalid data. It’s my life hours which go into dealing with invalid data just because somebody else didn’t do their homework…

    What would be the expected server behaviour?

    rfc2822 1 Reply 0
  • rfc2822
    developer

    This is so confusing.
    Leaving 3.0 aside, these are the different formats I could find in my own contacts by randomly checking a few:

    Please note that there are different PHOTO formats for VCard 3 and VCard 4:

    If your server is VCard 4-capable, DAVdroid will send VCard 4, i.e. the latter format. In the other case, VCard 3 will be used. The server is responsible for detecting the correct format (if it says it’s VCard 4-capable, like OwnCloud), and storing the information in a way that can be served as VCard 3 or VCard 4 correctly.

    • PHOTO;VALUE=uri:http://domain.com/img.jpg

    A valid PHOTO for VCard 3 and VCard 4 (although VALUE=uri is redundant for VCard 4 because it’s the default type there), which is stored in an external resource.

    • PHOTO:http://www.example.com/pub/photos/jqpublic.gif

    A valid VCard 4 photo which is stored in an external resource. VCard 3 assumes a binary value by default, so this is invalid in VCard 3.

    • PHOTO:data:image/jpeg;base64,/9j/4AAQSkZJR...

    A valid VCard 4 photo where the URI is a data URI, i.e. the photo is stored inline. VCard 3 assumes a binary value by default, so this is invalid in VCard 3.

    • PHOTO;TYPE=image/png:data:application/octet-stream;base64,iVBORw0KG...

    Not valid. As far as I know, such lines are served/generated by defect OwnClouds.

    Some prepend VALUE=, others prependTYPE=, some add uri: in front of the uri, others just have the uri. Are these all valid or do they just work due to workarounds?

    See the RFC links I have posted above.

    Thanks! Which option is the one that you would want to see implemented?

    I think the most important thing is to add a try/catch for the code that fetches the external resource with okhttp, ignoring any errors which occur when downloading the resource.

    What would be the expected server behaviour?

    See the RFC links I have posted above.

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  • rfc2822
    developer

    I have added a check: https://gitlab.com/bitfireAT/davdroid/commit/20ee4e03f3196c17745961f25a12301818411452

    0

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