Post JSON file programatically to System Folder: Converting Curl script to Swift code

I'm working for a client that has an enterprise LiquidFiles account. I'm working from the Curl-based script that LiquidFiles uses as their example on how to post to a LiquidFiles System Folder, which I have working. Now I'm trying to convert this script to Swift code in an iOS app that I am developing, but I am having a devil of a time getting it working.

I know this may be a bit obscure, but I can't imagine I'm the only one who's ever tried to do such a thing. Here's the working curl-based script, based on what LiquidFiles provided (and de-identified):

-----
#!/bin/bash

# Some variables
filedrop_server=https://filetransfer.organization.edu
filedrop_url=$filedrop_server/filedrop/user-key

# upload the file and get attachment id
attachment_id=`curl -X POST -F Filedata=@fileToUpload.json --user "authorizationKey" $filedrop_server/attachments`

echo $attachment_id

cat <<EOF | curl -s -X POST -H "Content-Type: application/json" -d @- $filedrop_url
{"message":
{
"from":"sender@sender.com",
"subject":"Test Environment Event",
"message":"Sample JSON-file for Test Environment Event",
"attachments":["$attachment_id"]
}
}
-----

Enclosed below is the Swift code I currently have, where I'm just trying to do the code above that "upload the file and get the attachment id". I have been unsuccessful in getting even this to work whereby I get an attachment_id returned.

The next block of code from the curl-based script seems to be posting an email with that attachment_id included, and sending it to the System Folder we have set-up, but I'm not sure if this should be coded in a HTTPS POST or sent as an email.

I know that this is rather obscure, but if anyone has any ideas AT ALL on how I could get this working, I really appreciate the help.

Regards, Randy

-----

Here is the Swift code in its current state (I'm using a popular framework called Alamofire to do the HTTP calls).

let fileUploadHeaders = [
"Authorization": "authorizationKey"
]

do {
let jsonData = try jsonEncoder.encode(eatEvent)
Alamofire.upload(multipartFormData: { multipartFormData in
multipartFormData.append(jsonData,
withName: "Event",
fileName: "fileToUpload.json",
mimeType: "application/json")
},
to: "https://filetransfer.organization.edu/attachments",
headers: fileUploadHeaders,

encodingCompletion: { encodingResult in

switch encodingResult {
case .success(let upload, _, _):
upload.validate()
upload.responseJSON { response in
guard response.result.isSuccess,
let value = response.result.value else {
print("Error while uploading file: \(String(describing: response.result.error))")
return
}

// let attachmentID = JSON(value)["uploaded"][0]["id"].stringValue
print(response.result.value)

}
case .failure(let encodingError):
print(encodingError)
}
})
} catch {
print("Couldn't encode Meal as JSON in ForgotMeal flow.")
}
}

 

Thanks, David, for your reply. With some help from a colleague, I got this all working very nicely and am able to upload a JSON file to a given system filedrop folder. The source code in the iOS Swift language, for anyone who may benefit from it, is attached and de-identified (broken into three functions to match the three functions from the example Curl script). This file is called "Working JSON Upload" (sorry it's not prettier; this forum wouldn't let me upload a Rich-Text-File; had to export to PDF).

However, while I can upload a JSON file, I am now having trouble following the same pattern to upload a .jpg file. Please see the function: uploadFileWithKey(apiKey: String), which is the second function in the attached. You will see the block of code at the top of this function that successfully uploads the JSON.

Then, beneath that, is a block of code that tries to do the exact same thing, but instead of uploading JSON, is trying to upload a .jpg file. But here's the error I am getting -- the "response.result.value" returned when I try to upload the .jpg comes back as "Upload Error, invalid parameters". I've (more than) triple checked what I think the parameters should be for an image file, and I can't figure out why this isn't working.

Thanks for any help!