Re: HTTP Call to Google Geocode

This is an example that works like our current solution:

DATA: lr_conv TYPE REF TO cl_abap_conv_in_ce,
plaintext TYPE string.
DATA: lv_sign_key_x TYPE xstring,
lv_sign_key   TYPE string,
lv_hmac_result TYPE string,
lv_sign_string TYPE string.
TYPE-POOLS: abap.

lv_sign_string = url.

lv_sign_key = 'your_sign_key'.

* String to SafeBase64

REPLACE ALL OCCURRENCES OF '_' IN lv_sign_key WITH '/'.
REPLACE ALL OCCURRENCES OF '-' IN lv_sign_key WITH '+'.

* Do not sign the protocol/domain
REPLACE 'http://maps.googleapis.com' IN lv_sign_string WITH ''.

*Convert key from String to xString (hex)
CALL FUNCTION 'SSFC_BASE64_DECODE'
EXPORTING
b64data = lv_sign_key
IMPORTING
bindata = lv_sign_key_x.

* Generate signature
cl_abap_hmac=>calculate_hmac_for_char(
EXPORTING
if_algorithm     = 'SHA1'
if_key           = lv_sign_key_x
if_data          = lv_sign_string
IMPORTING
ef_hmacb64string = lv_hmac_result
).
* SafeBase64 -> Base64 again
REPLACE ALL OCCURRENCES OF '/' IN lv_hmac_result WITH '_'.
REPLACE ALL OCCURRENCES OF '+' IN lv_hmac_result WITH '-'.

* Concatenate final URL

CONCATENATE url '&signature=' lv_hmac_result INTO url.

Best regards,

Hendrik Behrens