get-GitHubDiscussion.ps1

param(
    [parameter(Mandatory)]
    $user,

    [System.Management.Automation.SwitchParameter]
    $delete,

    [string]
    $yourUsername,

    [parameter(Mandatory)]
    [string]
    $repository
)

$repositoryOwner, $repository = $repository -split '/'
if ($null -eq $repository) {
    throw "Please provide the repository in the format owner/repository"
}

$repositoryQuery = @"
query {
    repository(owner: "$repositoryOwner", name: "$repository") {
        id
    }
}
"@

$body = @{query=$repositoryQuery} | ConvertTo-Json
$repositoryData = Invoke-RestMethod https://api.github.com/graphql -Authentication OAuth -Token (Get-Secret GitHub) -Body $body -Method Post
if ($null -ne $repositoryData.errors) {
    $repositoryData.errors
    throw $repositoryData.errors.message
}

$repositoryId = $repositoryData.data.repository.id
Write-Verbose -Verbose "Repository ID: $repositoryId"

$query = @"
query {
    user(login: "$user") {
        repositoryDiscussions(first: 100, repositoryId: "$repositoryId") {
            nodes {
                title
                id
                repository {
                    name
                }
            }
        }
    }
}
"@

$body = @{query=$query} | ConvertTo-Json
$data = Invoke-RestMethod https://api.github.com/graphql -Authentication OAuth -Token (Get-Secret GitHub) -Body $body -Method Post
if ($null -ne $data.errors) {
    $data.errors
    throw $data.errors.message
}

write-verbose -verbose "Found $($data.data.user.repositoryDiscussions.nodes.Count) discussions"
$data.data.user.repositoryDiscussions.nodes

if ($delete) {
    if ($yourUsername -eq '') {
        throw "Please provide your username to delete discussions"
    }

    if ($repository -eq '') {
        throw "Please provide the repository name to delete discussions"
    }

    foreach ($discussion in $data.data.user.repositoryDiscussions.nodes) {
        if ($discussion.repository.name -ne $repository) {
            continue
        }

        Write-Verbose -Verbose "Deleting $($discussion.title)"
        $deleteQuery = @"
mutation {
    deleteDiscussion(input: {id: "$($discussion.id)", clientMutationId: "$yourUsername"}) {
        clientMutationId
    }
}
"@
        $body = @{query=$deleteQuery} | ConvertTo-Json
        $out = Invoke-RestMethod https://api.github.com/graphql -Authentication OAuth -Token (Get-Secret GitHub) -Body $body -Method Post
        if ($null -ne $out.errors) {
            $out.errors
            throw $out.errors.message
        }
        $out | ConvertTo-Json -Depth 10
    }
}