(Swift) Download File from Dropbox into a String Variable

Demonstrates how to download a file from Dropbox directly into a string variable.

Note: This example requires Chilkat v11.0.0 or greater.

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

func chilkatTest() {
    var success: Bool = false

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

    // A Dropbox access token should have been previously obtained.
    // Dropbox access tokens do not expire.
    // See Dropbox Access Token.

    let rest = CkoRest()!

    // Connect to Dropbox
    success = rest.connect("content.dropboxapi.com", port: 443, tls: true, autoReconnect: true)
    if success == false {
        print("\(rest.lastErrorText!)")
        return
    }

    // Add request headers.
    rest.addHeader("Authorization", value: "Bearer DROPBOX_ACCESS_TOKEN")

    // The download "parameters" are contained in JSON passed in an HTTP request header.
    // This is the JSON indicating the file to be downloaded:
    // { 
    //    "path": "/jack.txt",
    // }

    let json = CkoJsonObject()!
    json.append("path", value: "/jack.txt")
    rest.addHeader("Dropbox-API-Arg", value: json.emit())

    // The content of the file on Dropbox is returned.
    var fileContent: String? = rest.fullRequestNoBody("POST", uriPath: "/2/files/download")
    if rest.lastMethodSuccess == false {
        print("\(rest.lastErrorText!)")
        return
    }

    // When successful, Dropbox responds with a 200 response code.
    if rest.responseStatusCode.intValue != 200 {
        // Examine the request/response to see what happened.
        print("response status code = \(rest.responseStatusCode.intValue)")
        print("response status text = \(rest.responseStatusText!)")
        print("response header: \(rest.responseHeader!)")
        print("response body (if any): \(fileContent!)")
        print("---")
        print("LastRequestStartLine: \(rest.lastRequestStartLine!)")
        print("LastRequestHeader: \(rest.lastRequestHeader!)")
        return
    }

    // Show the file content that was downloaded:
    print("\(fileContent!)")
    print("----")

    // Information about the downloaded file is also available as JSON in a response header.
    // The "dropbox-api-result" response header contains the information.  For example:
    var apiResult: String? = rest.responseHdr(byName: "dropbox-api-result")
    print("\(apiResult!)")

    // In this case, the pretty-formatted dropbox-api-result JSON looks like this:
    // { 
    //   "name": "jack.txt",
    //   "path_lower": "/jack.txt",
    //   "path_display": "/jack.txt",
    //   "id": "id:yqx4-tE_NKAAAAAAAAAAAQ",
    //   "client_modified": "2016-06-02T20:42:11Z",
    //   "server_modified": "2016-06-02T20:42:11Z",
    //   "rev": "8482db15f",
    //   "size": 42
    // }

    // Load the JSON, pretty-print it, and demonstrate how to get some values...
    let jsonResult = CkoJsonObject()!
    jsonResult.emitCompact = false
    jsonResult.load(apiResult)
    // Show the JSON pretty-printed...
    print("\(jsonResult.emit()!)")

    // Sample code to get data from the JSON response:
    var size: Int = jsonResult.int(of: "size").intValue
    print("size = \(size)")

    var rev: String? = jsonResult.string(of: "rev")
    print("rev = \(rev!)")

    var clientModified: String? = jsonResult.string(of: "client_modified")
    let ckdt = CkoDateTime()!
    ckdt.setFromTimestamp(clientModified)
    var bLocalTime: Bool = true
    let dt = CkoDtObj()!
    ckdt.toDtObj(bLocalTime, dtObj: dt)

    print("\(dt.day.intValue)/\(dt.month.intValue)/\(dt.year.intValue) \(dt.hour.intValue):\(dt.minute.intValue)")

}