Q: Linkedin Vector Assest API, Registering Multi-Part Upload - No metadata value in response - linkedin

Question

I'm attempting to complete a multipart upload using Linkedin V2 Vector Assets and i've noticed that when registering the upload, the metadata field comes back blank in the response.
Here's the request to register the upload https://api.linkedin.com/v2/assets?action=registerUpload
{
"registerUploadRequest":{
"owner":"urn:li:organization:71736744",
"recipes":["urn:li:digitalmediaRecipe:feedshare-video"],
"serviceRelationships":[
{"identifier":"urn:li:userGeneratedContent","relationshipType":"OWNER"}
],
"supportedUploadMechanism":["MULTIPART_UPLOAD"],
"fileSize":50866165
}
and here is the response (removed all but one partUploadRequests object to make the response easier to read)
{
"value": {
"uploadMechanism": {
"com.linkedin.digitalmedia.uploading.MultipartUpload": {
"partUploadRequests": [
{
"headers": {
"Content-Type": "application/octet-stream"
},
"byteRange": { "lastByte": 4194303, "firstByte": 0 },
"url": "https://www.linkedin.com/dms-uploads/C5605AQFnYcNsf7K5Yw/uploadedVideo?sau=aHR0cHM6Ly93d3cubGlua2VkaW4uY29tL2FtYnJ5L2FtYnJ5LXZpZGVvLz94LWxpLWFtYnJ5LWVwPUFRRmp4SlBwRndkUUNnQUFBWGhjYkgwNzNuZmpacTRFM3AxUkpidTMxTlAxems3WmdoUHN1Ymp1TjVGTXVDRGFOaGczVnpHWXNpLW5OYWh2NlkxWkU5UDVIdktsQ2JxbGhhOUt1SElJSnBXTjI0TkEyWDIzM1ZiaS1aNW4yTmlXWWQyX1VlN1J2d0FEdkMwSG51ckNMY1ljMkdrczhKclFlZHRYNlZNN2dvTFJad2hpT0pxcFNZM29mXzdTTmRhZjZzQlNMS3FwaTJyWF9LYTRqTk9OcnBhTFpCam1KR3ZENEV3ZFd0VHEzNm44aEFQbDhCMmc3cVpOd3Q0Ny1TT1ZvcHRoT0dWcTB0cHAxU2VkbkY2aVNVQ3J6RVlwVHdzNDZTQlViME5HbGxITHo4a1ZNOGJxYkJjMDVCc054MDQ2ZDktZWdGb2RFa3ZKRmxsU0NRWFV2ZzdQb3VFaVNodkZtSHRYVHhLLWlkbnpKWjlQN1Q2b1ROQWJhWE5iR2g2QUdBQmQ3VVdjNkdGb01YaWFiazBhRlA4UzNpUXNlM05ISFNVdkFBdk1nSnV2a0xxWV9oYU1VTXdoeXFRT0w1a0NLM1NSd2RXTnpKSHZLMkhfY0ZqclYzcnB4VXJZckkxbUZ2QVl2Y3dUcVYyaDhWWHRpY1luNTA0am1jUjN3U0M5RVVQZEo2RFZEd1RJRmFvOTJYcmszbTFNS2pSRlFZMV94enVHZVk4SERKWTQwbDQySVRJNXlCLUp3b2V3Vjl3RGduOTZycmhoY1pLa0VOck5vdUZ4eDdodlBTNkZUVXcweXJWM3BaOUF5X2NtaHBXTVpwOVRFY0pJcGY3elFrQTF3ZFcyR3VIcEtGLUF4MldTZTdlR1pCOTdHaU5vLW9XamhkV2stR2MzNFh5UjFwckZsTF9sSFFUWU40S2pNLUI2Y2poZHFJV2xVTll6Z1lVaXdwNld2UEYwVFRObW5kQVgtTTBlX1VsaGFOQ190SDFEcG9Kem5IZExoN3IxMGk5VWE4MGpsZ3pDQzBsT3JKSkxuSEcwNm9jVzNJSzctT3NSZGhBSEFNdTBuWDNRdlhfSFoxWXpfNXgza3dyZzBPOVlmN2xIUFFiVW1lYllReUlJaGdxOEE1blpxVUxzeUpvZElLWk5WdUdlcjVuN21jTFV4TzRtNlBUczVtc3pHS0x4Z3o4b2FDdVNiWWliYzh2NkpxQktiN2RmejdnQWRFVVpfNnRLenVxUm11bGk5OGZVSVpOR3hfc3R1Mk9nVDYzYXRoQmZnRHQ0dGpnVi1BOWlaVXdtYWNLckxwVE5wNUdHZlBxZjhLaE1MZC1BVXotSVNoX19jRUlzM2laSXlpeC1pNlFpeGZyRmpxQnYwaDhwOGZpeXZ0Q2Job0xjU1g4aWNjX0lSX28xQXR0UmZB&pn=1&m=616825227&app=86804616&sync=0&v=beta&ut=1nBLJxAvwH5FI1",
"urlExpiresAt": 1616544717116
} ...
],
"metadata": ""
}
},
"asset": "urn:li:digitalmediaAsset:C5605AQFnYcNsf7K5Yw",
"mediaArtifact": "urn:li:digitalmediaMediaArtifact:(urn:li:digitalmediaAsset:C5605AQFnYcNsf7K5Yw,urn:li:digitalmediaMediaArtifactClass:uploadedVideo)"
}
}
The api documentation explains that I need to use the metadata value from the register upload response to complete the upload
I attempt making the request anyway without a value for the metadata field to https://api.linkedin.com/v2/assets?action=completeMultiPartUpload (removed all but one partUploadResponses object to make the response easier to read)
{
"completeMultipartUploadRequest": {
"mediaArtifact": "urn:li:digitalmediaMediaArtifact:(urn:li:digitalmediaAsset:C5605AQFnYcNsf7K5Yw,urn:li:digitalmediaMediaArtifactClass:uploadedVideo)",
"metadata": "",
"partUploadResponses": [
{
"headers": {
"ETag": "/ambry-video/signedId/AQGpSasdC3ezCgAAAXhcbTobXlB6_ujllr8BPUUAX4o9OgbHCxiRKoG9woM85dnGrxbUbd-5IXyMKO7syqyZXLgHFd8GQJkiMvvp1eHI9N32iJqMG-l_aFgSeXMbcqkFFcjuT22djM93dmKs_RBb58kppS3CadOPHSt5_tApCxAq0wgTfYQng3OkV_uVRdjIYftyfnHW3nF2vWz4hZBoX-YhmF6gDhXtN9dNTnU4QpHB7sGCecpjYgT8ypV-u5isvFrujHl3tl4.bin"
},
"httpStatusCode": 200
} ....
]
}
}
This comes back as a 200OK without any response body which is expected.
After that I check the upload status and which comes back with a code of SERVER_ERROR and I'm not able to create a post with the asset id of the uploaded asset.
Response from checking asset status https://api.linkedin.com/v2/assets/C5605AQFnYcNsf7K5Yw
{
"recipes": [
{
"recipe": "urn:li:digitalmediaRecipe:feedshare-video",
"status": "SERVER_ERROR"
}
],
"serviceRelationships": [
{
"relationshipType": "OWNER",
"identifier": "urn:li:userGeneratedContent"
}
],
"mediaTypeFamily": "VIDEO",
"created": 1616458317042,
"id": "C5605AQFnYcNsf7K5Yw",
"lastModified": 1616458454711,
"status": "ALLOWED"
}
Request to create a UGC post with the asset https://api.linkedin.com/v2/assets
{
"author": "urn:li:organization:71736744",
"lifecycleState": "PUBLISHED",
"specificContent": {
"com.linkedin.ugc.ShareContent": {
"media": [
{
"media": "urn:li:digitalmediaAsset:C5605AQFnYcNsf7K5Yw",
"status": "READY",
"title": {
"attributes": [],
"text": "Sample Video Create"
}
}
],
"shareCommentary": {
"attributes": [],
"text": "Some share text"
},
"shareMediaCategory": "VIDEO"
}
},
"visibility": {
"com.linkedin.ugc.MemberNetworkVisibility": "PUBLIC"
}
Response to the request
{
"serviceErrorCode": 0,
"message": "Resource assets does not exist",
"status": 404}
The only thing I can think of is since I don't have a metadata value when completing the upload I'm not able to use the video asset in UGC posts. Anyone encountered a problem similar to this?
Further Investigations
On further investigation the example from the API docs doesn't return a metadata field either. So this is what I think might be happening
I'm not uploading the file chunks correctly and the metadata field isn't required for completing the upload.
The API has a bug in it which prevents it from returning the metadata field when registering a multipart upload.

Answer 1

Figured it out, when using the slice method to break your file up into chunks it needs to be file.slice(firstByte, lastByte + 1)
It also seems that the metadata value from the register upload request isn't need to complete the upload.