Powershell Invoke-RestMethod POST has issues with json - powershell

Question

I am trying to use a REST API to configure some alerts in RecoverPoint for Virtual Machines (RP4VM). I am trying to enter multiple filters at the same using json. The json file looks like this:
[
{
"JsonSubType": "SystemEventLogsFilter",
"level": "WARNING",
"scope": "NORMAL",
"eventsIDs": [],
"filterUID": {
"id": 1570417688566256135
},
"name": "RPA_issue",
"topic": "RPA",
"groupsToInclude": null
},
{
"JsonSubType": "SystemEventLogsFilter",
"level": "WARNING",
"scope": "ADVANCED",
"eventsIDs": [],
"filterUID": {
"id": -1728986321682574312
},
"name": "cluster_events",
"topic": "CLUSTER",
"groupsToInclude": null
}
]
When I try to run the script I get an error:
Unexpected token (START_ARRAY), expected START_OBJECT: need JSON Object to contain As.PROPERTY type information (for class com.emc.fapi.version5_2.commons.SystemEventLogsFilter)
at [Source: org.apache.catalina.connector.CoyoteInputStream#75b592c2; line: 1, column: 1]
If I remove the square brackets it does the first value but not the second. Is this an issue with my code or an issue with theirs?
The script:
$rp4vmcl = import-csv -Path .\test_clusters.csv
$credential = Get-Credential
$username = $credential.GetNetworkCredential().UserName
$password = $credential.GetNetworkCredential().password
$credPair = "$($username):$($password)"
$encodedCredentials = [System.Convert]::ToBase64String([System.Text.Encoding]::ASCII.GetBytes($credPair))
$headers = #{
Authorization = "Basic $encodedCredentials";
"Accept" = "application/json";
"Content-Type" = "application/json"
}
$comp = "/system/event_logs_filters"
$json = Get-Content .\event_log_filter.json -Raw
foreach ($s in $rp4vmcl) {
$cluster = $s.cluster_name
$uid = $s.cluster_uid
$curl = $s.cluster_url
$url = "$curl$comp"
$cluster
$results = Invoke-RestMethod -Method POST -uri $url -SkipCertificateCheck -Headers $headers -Body $json
}

Answer 1

If the recipient expect one Call per Json Object it will not be able to handle arrays. It's totally dependant from the implementation of the webservice. Btw, better change the body:
$results = Invoke-RestMethod -Method POST -uri $url -SkipCertificateCheck -Headers $headers -Body ([System.Text.Encoding]::UTF8.GetBytes($json))
Try this first, and if this is doesnt help, loop through the elemnts and call the webservice individual:
$jsonObject = $json | ConvertFrom-Json
$results = #()
$jsonObject | foreach {
$json = $_ | ConvertTo-Json -Depth 99
$results += Invoke-RestMethod -Method POST -uri $url -SkipCertificateCheck -Headers $headers -Body ([System.Text.Encoding]::UTF8.GetBytes($json))
}
Btw, the invoke-restmethod is buggy in powershell < 6 Version, so if youre will with the standard V5 Windows Version, check the response headers via invoke-webservice, and if the response header is:
"application/json"
and not
"application/json; charset=utf-8"
powershell will misinterpret this as a windows encoding. So if youree experiencing encoding issues, you have four options:
1.) if you can modify the webservice, change the response header
2.) switch to a newer powershell version (v7 is recommended)
3.) build your own webservice call directly via the .net cmdlets
4.) use the invoke-webservice, write the answer directly into a file with the OutFile Paramater
see also:
Powershell Invoke-RestMethod incorrect character