CODEWITHSUNDEEP
jsonswiftpostalamofireclarifai
Thijs van der Heijden
Thijs van der Heijden

Reputation: 1176

How to write a POST request using Alamofire and swift 4 for the Clarifai API?

I am relatively new to networking in Swift, and especially POST requests. I have read the documentation for the Clarifai API and for Alamofire, but haven't quite figured out how to write a working request using Alamofire. So far I have found the following piece of code which creates a structure that conforms to the API of Clarifai which wants the request to be structured like this:

curl -X POST \
  -H "Authorization: Key YOUR_API_KEY" \
 -H "Content-Type: application/json" \
-d @https://api.clarifai.com/v2/models/aaa03c23b3724a16a56b629203edc62c/outputs << FILEIN
 {
   "inputs": [
    {
    "data": {
      "image": {
        "base64": "$(base64 /home/user/image.png)"
      }
    }
  }
]
}
FILEIN

This is the swift code I found that achieves exactly that:

struct ImageObj: Codable { let base64: String }

    struct DataObj: Codable {
        let image: ImageObj
    }
    
    struct InputObj: Codable {
        let data: DataObj
    }
    
    struct InputsContainerObj: Codable {
        let inputs: [InputObj]
    }
    
    let imageObj = ImageObj(base64: "abc123")
    let dataObj = DataObj(image: imageObj)
    let inputObj = InputObj(data: dataObj)
    let inputsContainerObj = InputsContainerObj(inputs: [inputObj])
    
    let encoder = JSONEncoder()
    do {
        let jsonData = try encoder.encode(inputsContainerObj)
        let jsonString = String(data: jsonData, encoding: .utf8)!
        
        print(jsonString) //{"inputs":[{"data":{"image":{"base64":"abc123"}}}]}
    } catch _ as NSError {
        
    }

Now I have no idea what I should do after this point. I tried writing an Alamofire request using POST, but got stuck on parameters? and encodables? For parameters I tried something like:

let parameters: Parameters = [
        "Authorization: Key":"xxxxxxxxxxxxxxxxxxxxxxxx",
    "Content-Type":"application/json"]

But I don't know if it is correct. If anyone could help me out here I would greatly appreciate it! Have a nice day everyone!

Upvotes: 3

Views: 226

Answers (1)

syntheticgio
syntheticgio

Reputation: 608

It looks like you've constructed the jsonString from the object and also the headers (you've called them 'parameters'). You should be able to send via the following:

let headers: [String: AnyObject] = [
    "Authorization: Key":"xxxxxxxxxxxxxxxxxxxxxxxx",
    "Content-Type":"application/json"
]

Alamofire.request(.POST, "https://api.clarifai.com/v2/inputs", parameters: jsonString, headers: headers, encoding: .JSON)
    .responseJSON { request, response, JSON, error in
        print(response)
        print(JSON)
        print(error)
    }

I've re-named them as headers to make it more clear above. Please note, I've masked out the Authorization Key (both in the answer and in the original question) - generally you wouldn't want to share this to the public.

Upvotes: 1

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