Cannot POST Cosmos DB Stored Procedures using PowerShell - azure

Question

I'm trying to deploy stored procedures to a collection within an Azure Cosmos DB account as part of my deployment pipeline in Azure DevOps. Due to security reasons, I have to use the REST API (cannot use or import PowerShell modules to do this).
The build agents that I'm using are on-premise agents. Again, security reasons.
In order to generate an authorization token to make requests, I have the following PowerShell function:
Add-Type -AssemblyName System.Web
# Generate Authorization Key for REST calls
Function Generate-MasterKeyAuthorizationSignature
{
[CmdletBinding()]
Param
(
[Parameter(Mandatory=$true)][String]$verb,
[Parameter(Mandatory=$true)][String]$resourceLink,
[Parameter(Mandatory=$true)][String]$resourceType,
[Parameter(Mandatory=$true)][String]$dateTime,
[Parameter(Mandatory=$true)][String]$key,
[Parameter(Mandatory=$true)][String]$keyType,
[Parameter(Mandatory=$true)][String]$tokenVersion
)
$hmacSha256 = New-Object System.Security.Cryptography.HMACSHA256
$hmacSha256.Key = [System.Convert]::FromBase64String($key)
$payLoad = "$($verb.ToLowerInvariant())`n$($resourceType.ToLowerInvariant())`n$resourceLink`n$($dateTime.ToLowerInvariant())`n`n"
$hashPayLoad = $hmacSha256.ComputeHash([System.Text.Encoding]::UTF8.GetBytes($payLoad))
$signature = [System.Convert]::ToBase64String($hashPayLoad);
[System.Web.HttpUtility]::UrlEncode("type=$keyType&ver=$tokenVersion&sig=$signature")
}
I then call this function within the POST function that I'm using to POST the stored procedure to Azure Cosmos DB:
Function Post-StoredProcToCosmosDb
{
[CmdletBinding()]
Param
(
[Parameter(Mandatory=$true)][String]$EndPoint,
[Parameter(Mandatory=$true)][String]$DataBaseId,
[Parameter(Mandatory=$true)][String]$CollectionId,
[Parameter(Mandatory=$true)][String]$MasterKey,
[Parameter(Mandatory=$true)][String]$JSON
)
$Verb = 'Post'
$ResourceType = "sprocs"
$ResourceLink = "dbs/$DataBaseId/colls/$CollectionId"
$dateTime = [DateTime]::UtcNow.ToString("r")
$authHeader = Generate-MasterKeyAuthorizationSignature -verb $Verb -resourceLink $ResourceLink -resourceType $ResourceType -key $MasterKey -keyType "master" -tokenVersion "1.0" -dateTime $dateTime
$header = #{authorization=$authHeader;"x-ms-version"="2017-02-22";"x-ms-date"=$dateTime;"xs-ms-session-token"="28"}
$contentType = "application/json"
$queryUri = "$EndPoint$ResourceLink/sprocs"
$result = Invoke-RestMethod -Headers $header -Method $Verb -ContentType $contentType -Uri $queryUri -Body $JSON
return $result.statuscode
}
I see from the documentation that I need to pass my stored procedure in the body as a string, so I set the path of my stored procedure to a variable like so:
$HelloWorld = Get-Content -Path '.\Databases\MyCosmosDB\MyCosmosCollection\Stored Procedures\HelloWorld.js' | Out-String
I then call my POST function like so:
Post-StoredProcToCosmosDb -EndPoint $env:COSMOSENDPOINT -DataBaseId $env:MYCOSMOSDB -CollectionId $MyCollection -MasterKey $env:MASTERKEY -JSON $HelloWorld
However, when I run the task, I get the following error:
Invoke-RestMethod : The remote server returned an error: (400) Bad Request
At D:_workAzure\r12\a_Cosmos\Deployment\scripts\postStoredProcedures.ps1:61 char:15
$result = Invoke-RestMethod -Headers $header -Method $Verb -Content ...
+ CategoryInfo : InvalidOperation: (System.Net.HttpWebRequest:HttpWebRequest) [Invoke-RestMethod], WebException
+ FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell.Commands.InvokeRestMethodCommand
I have followed the example request body as outlined in the documentation for my stored procedure.
Here is what it looks like for your info:
"function () {\r\n var context = getContext();\r\n var response = context.getResponse();\r\n\r\n response.setBody(\"Hello, World\");\r\n}"
I'm fairly new to PowerShell, so I'm wondering where I am going wrong. I've tried setting the contentType to both application/json and application/query+json but otherwise, I'm not sure where I am going wrong?
If anyone can provide any guidance on this, I'd be most grateful.

Answer 1

So turns out the request body was wrong. It should be like this:
{
"body":"function HelloWorld() {\r\n var context = getContext();\r\n var response = context.getResponse();\r\nresponse.setBody(\"Hello, World\");\r\n}",
"id": "HelloWorld"
}
That's the acceptable request body for Stored Procedures. So what I should have done is set my $HelloWorld variable to:
$HelloWorld = Get-Content -Path '.\Databases\MyCosmosDB\MyCosmosCollection\Stored Procedures\HelloWorld.json' | Out-String
Hope my stupidity helps someone someday :/