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Category: SAP

SAP

ABAP

[ABAP] Validate JSON data

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While searching on how to validate a given JSON string, I found two options. The first simply returns a Boolean value, the second also returns information about what could be wrong.

DATA(lv_json) = '{'
             &&      '"employee": {'
             &&           |"name" : "Max", |
             &&           |"age"  : 43,    |
             &&      '}'
             && '}'.


" option 1:
DATA(is_valid) = /ui5/cl_json_util=>is_wellformed( lv_json ).

" option 2: 
DATA(lo_reader) = cl_sxml_string_reader=>create( cl_abap_codepage=>convert_to( lv_json ) ).
TRY.
    lo_reader->next_node( ).
    lo_reader->skip_node( ).
  CATCH cx_sxml_parse_error INTO DATA(lx_parse_error).
    WRITE lx_parse_error->get_text( ).
ENDTRY.
ABAP

[ABAP] Generate a QR-Code

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There are many blogs describing how to create a QR-Code in the context of SAPscript or Smartforms (e.g. here, here, here and here). But I was looking for a way to generate a QR-Code and only receive the graphical data stream from it, without the need for any manual steps such a creation via SE73. During my search, I found these two notes, which contained all the information I needed:

  • 2790500: mentions the class CL_RSTX_BARCODE_RENDERER with method QR_CODE
  • 2030263: describes the parameters for a QC-Code creation

Following my little test report:

PARAMETERS p_text TYPE string DEFAULT 'My QR-Code Content'.

DATA: lv_action   TYPE i.
DATA: lv_filename TYPE string.
DATA: lv_fullpath TYPE string.
DATA: lv_path     TYPE string.

TRY.
    cl_rstx_barcode_renderer=>qr_code( EXPORTING i_module_size      = 25                " Size of smallest module (in pixel, max: 32000)
                                                 i_barcode_text     = p_text            " Barcode text
*                                                 i_mode             = 'A'               " Mode ('N', 'A', 'L', 'B', 'K', 'U', '1', '2'; note 2030263)
*                                                 i_error_correction = 'H'               " Error correction ('L', 'M', 'Q', 'H')
*                                                 i_rotation         = 0                 " Rotation (0, 90, 180 or 270)
                                       IMPORTING e_bitmap           = DATA(e_bitmap) ). " Bitmap in BMP format

    DATA(lt_raw_data) = cl_bcs_convert=>xstring_to_solix( e_bitmap ).

    " Save-Dialog
    cl_gui_frontend_services=>file_save_dialog( EXPORTING default_file_name = 'QR-Code'
                                                          default_extension = 'bmp'
                                                          file_filter       = |{ cl_gui_frontend_services=>filetype_all }|
                                                CHANGING  filename          = lv_filename
                                                          path              = lv_path
                                                          fullpath          = lv_fullpath
                                                          user_action       = lv_action ).

    IF lv_action EQ cl_gui_frontend_services=>action_ok.

      " Download file to disk
      cl_gui_frontend_services=>gui_download( EXPORTING filename     = lv_fullpath
                                                        filetype     = 'BIN'
                                                        bin_filesize = xstrlen( e_bitmap )
                                              CHANGING  data_tab     = lt_raw_data ).
    ENDIF.

  CATCH cx_rstx_barcode_renderer INTO DATA(lo_exp).
    MESSAGE lo_exp->get_text( ) TYPE 'I'.
ENDTRY.
Fiori / SAPUI5

[SAPUI5] Promisify an oData request

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This is discussed for many years and unfortunately will not be implemented in the UI5 framework itself (see here). There are already different blogs describing how to build a wrapper for oData requests (for example here and here).

But with ES2024 it now got super simple to do this:

async function readData(model, entitySet) {
  const [promise, resolve, reject] = Promise.withResolver( )
  model.read(entitySet, {
    success: data => resolve(data),
    error: error => reject(error)
  })
  return promise
}

const user = await readData(oDataModel, "/user")
Fiori / SAPUI5

[SAPUI5] Model binding events

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this.getView().bindElement({
				path: sObjectPath,
				events: {
					dataRequested: (oEvent) => {}, // Executed when a request to server is send
					dataReceived: (oEvent) => {},  // Executed when data from server is received
					change:(oEvent) => {},         // Executed everytime you do ElementBinding
				}
			})

The events for dataRequested and dataReceived are only fired, when data is requested or data is received from a backend. This is not the case, when the requested data is already available in the model from a previous backend call. In such situations, the change event comes in handy.

The same can also be done via XML:

binding="{
  path: '/myEntitySet',
  events: {
    dataRequested: 'onDataRequested',
    dataReceived: 'onDataReceived',
    change: 'onDataChange'
  }
}"
BTP, CAP

[BTP] Get access token for specific tenant in a multitenant scenario using http rest client

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https://docs.cloudfoundry.org/api/uaa/version/4.6.0/index.html#password-grant

# url from XSUAA Service Key, but replace in the url the provider subdomain with the consumer subdomain (the tenant you want to call)
@xsuaaUrl = {{$dotenv xsuaaUrl}}
# clientid from XSUAA Service Key
@xsuaaClientId = {{$dotenv xsuaaClientId}}
# clientsecret from XSUAA Service Key
@xsuaaClientSecret = {{$dotenv xsuaaClientSecret}}

@username = {{$dotenv btp_username}}
@password = {{$dotenv btp_password}}

### Get Access Token for Cloud Foundry using Password Grant with BTP default IdP
# @name getXsuaaToken
POST {{xsuaaUrl}}/oauth/token
Accept: application/json
Authorization: Basic {{xsuaaClientId}}:{{xsuaaClientSecret}}
Content-Type: application/x-www-form-urlencoded

grant_type=password
&username={{username}}
&password={{password}}
&response_type=token

### Store access token 
@access_token = {{getXsuaaToken.response.body.$.access_token}}
BTP

[BTP] How to use the refresh_token to get a new valid access_token

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https://oauth.net/2/refresh-tokens

https://www.oauth.com/oauth2-servers/making-authenticated-requests/refreshing-an-access-token

https://docs.cloudfoundry.org/api/uaa/version/4.6.0/index.html#refresh-token

# url from XSUAA Service Key
@xsuaaUrl = {{$dotenv xsuaaUrl}}
# clientid from XSUAA Service Key
@xsuaaClientId = {{$dotenv xsuaaClientId}}
# clientsecret from XSUAA Service Key
@xsuaaClientSecret = {{$dotenv xsuaaClientSecret}}

#==================================================================#

### Get Access Token for Cloud Foundry using Grant Type Password with BTP default IdP 
# @name token_response
POST {{xsuaaUrl}}/oauth/token
Authorization: Basic {{xsuaaClientId}}:{{xsuaaClientSecret}}
Accept: application/json;charset=utf8
Content-Type: application/x-www-form-urlencoded

grant_type=password
&username={{$dotenv btp_username}}
&password={{$dotenv btp_password}}
&response_type=token

### Store access token and refresh token
@access_token = {{token_response.response.body.$.access_token}}
@refresh_token = {{token_response.response.body.$.refresh_token}}


### Use Refresh Token
# @name token_response
POST {{xsuaaUrl}}/oauth/token
Authorization: Basic {{xsuaaClientId}}:{{xsuaaClientSecret}}
Accept: application/json;charset=utf8
Content-Type: application/x-www-form-urlencoded

grant_type=refresh_token
&refresh_token={{refresh_token}}

### Store access token and refresh token
@access_token = {{token_response.response.body.$.access_token}}
@refresh_token = {{token_response.response.body.$.refresh_token}}
Fiori / SAPUI5

[SAPUI5] securityTokenAvailable

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Just noticed, that with UI5 version 1.119.0 the getSecurityToken() function got replaced with securityTokenAvailable().

https://sapui5.hana.ondemand.com/#/api/sap.ui.model.odata.v2.ODataModel%23methods/getSecurityToken

https://sapui5.hana.ondemand.com/#/api/sap.ui.model.odata.v2.ODataModel%23methods/securityTokenAvailable

// Returns the current security token if available; triggers a request to fetch the security token if it is not available.
const token = this.getModel().getSecurityToken() // Deprecated

// Returns a promise, which will resolve with the security token as soon as it is available.
const token = await this.getModel().securityTokenAvailable()
ABAP

[ABAP] Progress indicator

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SELECT * FROM sflight INTO TABLE @DATA(flights).

LOOP AT flights INTO DATA(flight).
  WAIT UP TO 1 SECONDS.
  cl_progress_indicator=>progress_indicate( i_text               = |Processing flight { flight-connid } as { sy-tabix } / { lines( flights ) }|
                                            i_processed          = sy-tabix
                                            i_total              = lines( flights )
                                            i_output_immediately = abap_true ).
ENDLOOP.