(Swift 3,4,5...) Cloudfare DNS over HTTPS

Cloudflare offers a DNS over HTTPS resolver at: https://cloudflare-dns.com/dns-query

This example demonstrates how to do a DNS lookup for a domain using Cloudfare's HTTPS resolver.

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let http = CkoHttp()!

    // Send the following CURL request:   curl -H 'accept: application/dns-json' 'https://cloudflare-dns.com/dns-query?name=chilkat.io&type=A'

    http.accept = "application/dns-json"

    var url: String? = "https://cloudflare-dns.com/dns-query?name=chilkat.io&type=A"

    var jsonResp: String? = http.quickGetStr(url)
    if http.lastMethodSuccess != true {
        print("\(http.lastErrorText!)")
        return
    }

    print("Response Status Code: \(http.lastStatus.intValue)")

    let json = CkoJsonObject()!
    json.load(jsonResp)
    json.emitCompact = false
    print("\(json.emit()!)")

    if http.lastStatus.intValue != 200 {
        print("Failed.")
        return
    }

    // Sample output...
    // (See the parsing code below..)
    // 

    // {
    //   "Status": 0,
    //   "TC": false,
    //   "RD": true,
    //   "RA": true,
    //   "AD": false,
    //   "CD": false,
    //   "Question": [
    //     {
    //       "name": "chilkat.io.",
    //       "type": 1
    //     }
    //   ],
    //   "Answer": [
    //     {
    //       "name": "chilkat.io.",
    //       "type": 1,
    //       "TTL": 900,
    //       "data": "52.25.83.238"
    //     }
    //   ]
    // }

    // Use this online tool to generate parsing code from sample JSON: 
    // Generate Parsing Code from JSON

    var Status: Int
    var TC: Bool
    var RD: Bool
    var RA: Bool
    var AD: Bool
    var CD: Bool
    var i: Int
    var count_i: Int
    var name: String?
    var type: Int
    var TTL: Int
    var data: String?
    var ipAddr: String?

    Status = json.int(of: "Status").intValue
    TC = json.bool(of: "TC")
    RD = json.bool(of: "RD")
    RA = json.bool(of: "RA")
    AD = json.bool(of: "AD")
    CD = json.bool(of: "CD")
    i = 0
    count_i = json.size(ofArray: "Question").intValue
    while i < count_i {
        json.i = i
        name = json.string(of: "Question[i].name")
        type = json.int(of: "Question[i].type").intValue
        i = i + 1
    }

    i = 0
    count_i = json.size(ofArray: "Answer").intValue
    // The domain name resolves to 1 or more IP addresses..
    while i < count_i {
        json.i = i
        name = json.string(of: "Answer[i].name")
        type = json.int(of: "Answer[i].type").intValue
        TTL = json.int(of: "Answer[i].TTL").intValue
        ipAddr = json.string(of: "Answer[i].data")

        print("IP Address: \(ipAddr!)")
        i = i + 1
    }


}