(Delphi DLL) Create a Temporary Public Link to a DropBox File

Get a temporary link to stream content of a file. This link will expire in four hours and afterwards you will get 410 Gone.

For more information, see https://www.dropbox.com/developers/documentation/http/documentation#files-get_temporary_link

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Http, StringBuilder, HttpResponse, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
http: HCkHttp;
success: Boolean;
json: HCkJsonObject;
resp: HCkHttpResponse;
sbResponseBody: HCkStringBuilder;
jResp: HCkJsonObject;
respStatusCode: Integer;
template_id: PWideChar;
j: Integer;
count_j: Integer;
name: PWideChar;
value: PWideChar;
metadataName: PWideChar;
metadataId: PWideChar;
metadataClient_modified: PWideChar;
metadataServer_modified: PWideChar;
metadataRev: PWideChar;
metadataSize: Integer;
metadataPath_lower: PWideChar;
metadataPath_display: PWideChar;
metadataSharing_infoRead_only: Boolean;
metadataSharing_infoParent_shared_folder_id: PWideChar;
metadataSharing_infoModified_by: PWideChar;
metadataIs_downloadable: Boolean;
metadataHas_explicit_shared_members: Boolean;
metadataContent_hash: PWideChar;
link: PWideChar;
i: Integer;
count_i: Integer;

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

http := CkHttp_Create();

// Implements the following CURL command:

// curl -X POST https://api.dropboxapi.com/2/files/get_temporary_link \
//     --header "Authorization: Bearer DROPBOX_ACCESS_TOKEN" \
//     --header "Content-Type: application/json" \
//     --data "{\"path\": \"/video.mp4\"}"

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

// The following JSON is sent in the request body.

// {
//   "path": "/video.mp4"
// }

json := CkJsonObject_Create();
CkJsonObject_UpdateString(json,'path','/video.mp4');

CkHttp_SetRequestHeader(http,'Authorization','Bearer DROPBOX_ACCESS_TOKEN');
CkHttp_SetRequestHeader(http,'Content-Type','application/json');

resp := CkHttp_PostJson3(http,'https://api.dropboxapi.com/2/files/get_temporary_link','application/json',json);
if (CkHttp_getLastMethodSuccess(http) = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

sbResponseBody := CkStringBuilder_Create();
CkHttpResponse_GetBodySb(resp,sbResponseBody);
jResp := CkJsonObject_Create();
CkJsonObject_LoadSb(jResp,sbResponseBody);
CkJsonObject_putEmitCompact(jResp,False);

Memo1.Lines.Add('Response Body:');
Memo1.Lines.Add(CkJsonObject__emit(jResp));

respStatusCode := CkHttpResponse_getStatusCode(resp);
Memo1.Lines.Add('Response Status Code = ' + IntToStr(respStatusCode));
if (respStatusCode >= 400) then
  begin
    Memo1.Lines.Add('Response Header:');
    Memo1.Lines.Add(CkHttpResponse__header(resp));
    Memo1.Lines.Add('Failed.');
    CkHttpResponse_Dispose(resp);
    Exit;
  end;
CkHttpResponse_Dispose(resp);

// Sample JSON response:
// (Sample code for parsing the JSON response is shown below)

// {
//   "metadata": {
//     "name": "Prime_Numbers.txt",
//     "id": "id:a4ayc_80_OEAAAAAAAAAXw",
//     "client_modified": "2015-05-12T15:50:38Z",
//     "server_modified": "2015-05-12T15:50:38Z",
//     "rev": "a1c10ce0dd78",
//     "size": 7212,
//     "path_lower": "/homework/math/prime_numbers.txt",
//     "path_display": "/Homework/math/Prime_Numbers.txt",
//     "sharing_info": {
//       "read_only": true,
//       "parent_shared_folder_id": "84528192421",
//       "modified_by": "dbid:AAH4f99T0taONIb-OurWxbNQ6ywGRopQngc"
//     },
//     "is_downloadable": true,
//     "property_groups": [
//       {
//         "template_id": "ptid:1a5n2i6d3OYEAAAAAAAAAYa",
//         "fields": [
//           {
//             "name": "Security Policy",
//             "value": "Confidential"
//           }
//         ]
//       }
//     ],
//     "has_explicit_shared_members": false,
//     "content_hash": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
//   },
//   "link": "https://dl.dropboxusercontent.com/apitl/1/YXNkZmFzZGcyMzQyMzI0NjU2NDU2NDU2"
// }

// Sample code for parsing the JSON response...
// Use the following online tool to generate parsing code from sample JSON:
// Generate Parsing Code from JSON

metadataName := CkJsonObject__stringOf(jResp,'metadata.name');
metadataId := CkJsonObject__stringOf(jResp,'metadata.id');
metadataClient_modified := CkJsonObject__stringOf(jResp,'metadata.client_modified');
metadataServer_modified := CkJsonObject__stringOf(jResp,'metadata.server_modified');
metadataRev := CkJsonObject__stringOf(jResp,'metadata.rev');
metadataSize := CkJsonObject_IntOf(jResp,'metadata.size');
metadataPath_lower := CkJsonObject__stringOf(jResp,'metadata.path_lower');
metadataPath_display := CkJsonObject__stringOf(jResp,'metadata.path_display');
metadataSharing_infoRead_only := CkJsonObject_BoolOf(jResp,'metadata.sharing_info.read_only');
metadataSharing_infoParent_shared_folder_id := CkJsonObject__stringOf(jResp,'metadata.sharing_info.parent_shared_folder_id');
metadataSharing_infoModified_by := CkJsonObject__stringOf(jResp,'metadata.sharing_info.modified_by');
metadataIs_downloadable := CkJsonObject_BoolOf(jResp,'metadata.is_downloadable');
metadataHas_explicit_shared_members := CkJsonObject_BoolOf(jResp,'metadata.has_explicit_shared_members');
metadataContent_hash := CkJsonObject__stringOf(jResp,'metadata.content_hash');
link := CkJsonObject__stringOf(jResp,'link');
i := 0;
count_i := CkJsonObject_SizeOfArray(jResp,'metadata.property_groups');
while i < count_i do
  begin
    CkJsonObject_putI(jResp,i);
    template_id := CkJsonObject__stringOf(jResp,'metadata.property_groups[i].template_id');
    j := 0;
    count_j := CkJsonObject_SizeOfArray(jResp,'metadata.property_groups[i].fields');
    while j < count_j do
      begin
        CkJsonObject_putJ(jResp,j);
        name := CkJsonObject__stringOf(jResp,'metadata.property_groups[i].fields[j].name');
        value := CkJsonObject__stringOf(jResp,'metadata.property_groups[i].fields[j].value');
        j := j + 1;
      end;

    i := i + 1;
  end;

CkHttp_Dispose(http);
CkJsonObject_Dispose(json);
CkStringBuilder_Dispose(sbResponseBody);
CkJsonObject_Dispose(jResp);

end;