Curl Post method Sentinel on Flutter

Apps / Services
1

I need to extract the dates through the Sentinel server. On the Sentinel page there is an example using Curl but I’m having problems: Http Status 500 Internal Server Error and I don’t know how to solve it and i tried to find some solution without success. I already have the token and the problem is not authentication. Here is the sample code for sentinel:

Sentinel link: Where can I get a list of the available imagery dates for a specific area?

curl -X POST 'services.sentinel-hub.com/api/v1/catalog/search' \
-header 'Authorization: Bearer <your access token>' \
-header 'Content-Type: application/json' \
-data-raw '{
    "bbox": [13,45,14,46],
    "datetime": "2019-12-10T00:00:00Z/2020-12-15T00:00:00Z",
    "collections": ["sentinel-1-grd"],
    "limit": 50,
    "distinct": "date"
}'

And here is the Dart code:

 var url = 'http://services.sentinel-hub.com/api/v1/catalog/search';
    Map<String, dynamic> body = {
      "bbox": "[13, 45, 14, 46]",
      "datetime": "2019-12-10T00:00:00Z/2020-12-15T00:00:00Z",
      "collections": ["sentinel-2-l2a"],
      "limit": 50,
      "distinct": "date"
    };

    var response = await http.post(
      url,
      headers: {
        'Authorization': 'Bearer <your access token>',
        'Content-Type': 'application/json',
      },
      body: json.encode(body),
    );

Thanks in advance :slight_smile:

3

Hello!

I just had a look at your problem. Do you get an additional error message besides 500 Internal Server Error?

Best regards
Pontus

1 Like
4

The message I get in the message variable:
´´´
var message = jsonDecode(response.body);
´´´
is:

{code: 500, description: MessageBodyReader not found for media type=application/json, type=class io.jsonwebtoken.impl.DefaultClaims, genericType=class io.jsonwebtoken.impl.DefaultClaims.}

5

Hi again,

Thank you for waiting, we are currently troubleshooting your problem.

I will reach back to you again before 15:00 central european time with an update on our progress.

Best regards
Pontus

6

Hello!

Could you try running this code and check if it works?

Map<String, dynamic> body = {
  "bbox": [13, 45, 14, 46],
  "datetime": "2019-12-10T00:00:00Z/2020-12-15T00:00:00Z",
  "collections": ["sentinel-2-l2a"],
  "limit": 50,
  "distinct": "date"
};

var response = await http.post(
  Uri.https('services.sentinel-hub.com', '/api/v1/catalog/search'), 
  headers: {
    'Authorization': 'Bearer <Your Access Token Here> ',
    'Content-Type': 'application/json',
  },
  body: json.encode(body),
);

var decoded = jsonDecode(response.body);
debugPrint('response: $decoded');
7

Hello, still has the same error. I tried to Post on the postman website and continue the same error too.

“code”: 500,

“description”: “MessageBodyReader not found for media type=application/json, type=class io.jsonwebtoken.impl.DefaultClaims, genericType=class io.jsonwebtoken.impl.DefaultClaims.”.

8

Okay!

Could you try to create a new Client ID/Secret on the Sentinel Hub dashboard and generate a new authentication token from it?

9

Hello. Still the same situation :frowning: I am using a trial period. Is the service really working?

10

Could you send me a private message here on the forum where you show what your Authorization part looks when you send the request?

This one:
'Authorization': 'Bearer <your access token>

1 Like
11

Hi,
Is this solution working?

12

Hi, it worked and it is working.

13

Hello!

Let me know if you’re experiencing any problems and I will help you.

14

Hi,
Yes. I have no programming experience, but I have not been successful.
In DartPad:
Error: ‘await’ can only be used in ‘async’ or ‘async*’ methods.

15

So, in my project i call the function tapping the button with function onPressed:

onPressed: () async {
      if (parcelas.parcelaPAGAMENTOSTATUS == 1 || trialStatus == 1) {
         await loadDateForCalendar(context, parcelas.parcelaCOORDENADAS); 
      }

and here is the function loadDateForCalendar:

loadDateForCalendar(BuildContext context, String coordenadas) async {
      var url = 'https://<yoursite>/auth.php';
      var response3 = await http.post(url);
      var message3 = json.decode(json.encode(response3.body));
      Map<String, dynamic> body = {
        "bbox": [13,45,14,46],
        "datetime": "2019-12-10T00:00:00Z/2020-12-15T00:00:00Z",
        "collections": ["sentinel-2-l2a"],
        "limit": 80,
        "distinct": "date"
      };

      var response = await http.post(
        Uri.https('services.sentinel-hub.com', '/api/v1/catalog/search'), 
        headers: {
          'Authorization': 'Bearer ' + message3,',
          'Content-Type': 'application/json',
        },
        body: json.encode(body),
      );

I have a php url to update the acess token with my client Id and client secret.

16

Thanks,
Kenny
I’ll write something like that and test it.
Regards