(PowerShell) curl with Target Outputs

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For curl requests that return JSON, you can define output variables that extract specific values directly from the response. Instead of manually parsing the JSON, you provide a JSON path for each value you want. Chilkat uses this path to locate the value and assign it to a variable, which your application can then retrieve using GetVar.

Note: This example requires Chilkat v11.5.0 or greater.

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Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

# This example executes a curl command to retrieve information about a SharePoint site
# from Microsoft Graph. The request uses variable placeholders that will be replaced
# at runtime with actual values.
# 
# Equivalent curl command:
# 
# curl -X GET "https://graph.microsoft.com/v1.0/sites/{{sharepoint_hostname}}:/sites/{{site_name}}" \
#   -H "Authorization: Bearer ACCESS_TOKEN" \
#   -H "Accept: application/json"
# 
# A typical JSON response looks like this:
# 
# {
#   "@odata.context": "...",
#   "createdDateTime": "...",
#   "description": "Test site",
#   "id": "example.sharepoint.com,...",
#   "lastModifiedDateTime": "...",
#   "name": "test",
#   "webUrl": "...",
#   "displayName": "test",
#   "root": {},
#   "siteCollection": {
#     "hostname": "example.sharepoint.com"
#   }
# }
# 
# Rather than processing the entire JSON response, this example extracts only the
# specific values we care about: id, description, and siteCollection.hostname.
# These values are located at known JSON paths, so we can define them as "target outputs".

$sbTargetCurl = New-Object Chilkat.StringBuilder
$sbTargetCurl.AppendLn("curl -X GET `"https://graph.microsoft.com/v1.0/sites/{{sharepoint_hostname}}:/sites/{{site_name}}`" \`")
$sbTargetCurl.AppendLn("  -H `"Authorization: Bearer ACCESS_TOKEN`" \`")
$sbTargetCurl.AppendLn("  -H `"Accept: application/json`"")

$httpCurl = New-Object Chilkat.HttpCurl

# Configure OAuth2 authentication using the client credentials flow.
# Secrets (client_id, client_secret, token_endpoint) are retrieved from the
# local secrets manager because EnableSecrets is set to true.
$jsonOAuth2 = New-Object Chilkat.JsonObject
$jsonOAuth2.EnableSecrets = $true
$jsonOAuth2.UpdateString("oauth2.client_id","!!sharepoint|oauth2|client_id")
$jsonOAuth2.UpdateString("oauth2.client_secret","!!sharepoint|oauth2|client_secret")
$jsonOAuth2.UpdateString("oauth2.scope","https://graph.microsoft.com/.default")
$jsonOAuth2.UpdateString("oauth2.token_endpoint","!!sharepoint|oauth2|token_endpoint")
$httpCurl.SetAuth($jsonOAuth2)

# Define values for the variables used in the curl command.
# These replace the {{sharepoint_hostname}} and {{site_name}} placeholders at runtime.
$httpCurl.SetVar("sharepoint_hostname","example.sharepoint.com")
$httpCurl.SetVar("site_name","test")

# Define target outputs for the curl command.
# Each call maps a JSON path in the response to a variable name.
# After execution, these variables can be retrieved using GetVar.
$httpCurl.AddTargetOutput("id","site_id")
$httpCurl.AddTargetOutput("description","site_description")
$httpCurl.AddTargetOutput("siteCollection.hostname","site_hostname")

# Execute the curl command. Variable substitution and authentication
# are handled automatically.
$success = $httpCurl.DoYourThing($sbTargetCurl.GetAsString())
if ($success -eq $false) {
    $($httpCurl.LastErrorText)
    exit
}

# Load the JSON response from the server.
$responseJson = New-Object Chilkat.JsonObject
$responseJson.EmitCompact = $false
$httpCurl.GetResponseJson($responseJson)

# Check the HTTP status code returned by the request.
$statusCode = $httpCurl.StatusCode
$("response status code: " + $statusCode)

if ($statusCode -ne 200) {
    # If the request failed, the JSON response will contain error details
    # instead of the expected data.
    $($responseJson.Emit())
    exit
}

# Verify that all target output variables were successfully extracted.
# Passing "!" to VarDefined returns $true only if all target outputs are defined.
$allTargetsDefined = $httpCurl.VarDefined("!")
if ($allTargetsDefined -eq $false) {
    $($httpCurl.LastErrorText)
    $("Not all target outputs were located and defined.")
    exit
}

# Retrieve and display the extracted values from the response.
$("site_id = " + $httpCurl.GetVar("site_id"))
$("site_description = " + $httpCurl.GetVar("site_description"))
$("site_hostname = " + $httpCurl.GetVar("site_hostname"))

# Example output:

# site_id = example.sharepoint.com,9b923c5e-5117-44ad-8b03-cdbb8e19ae85,b2451e19-290f-4f29-9f5d-674c2951a9f7
# site_description = Test site
# site_hostname = example.sharepoint.com