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zcl_swag.clas.abap
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zcl_swag.clas.abap
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CLASS zcl_swag DEFINITION
PUBLIC
CREATE PUBLIC .
PUBLIC SECTION.
CONSTANTS:
BEGIN OF c_parm_kind,
importing TYPE seopardecl VALUE '0',
exporting TYPE seopardecl VALUE '1',
changing TYPE seopardecl VALUE '2',
returning TYPE seopardecl VALUE '3',
END OF c_parm_kind .
TYPES:
ty_parameters_tt TYPE STANDARD TABLE OF seosubcodf WITH DEFAULT KEY .
TYPES:
BEGIN OF ty_url,
regex TYPE string,
group_names TYPE STANDARD TABLE OF seosconame WITH DEFAULT KEY,
END OF ty_url .
TYPES:
BEGIN OF ty_meta,
summary TYPE string,
url TYPE ty_url,
method TYPE string,
handler TYPE string,
END OF ty_meta .
TYPES:
BEGIN OF ty_meta_internal,
meta TYPE ty_meta,
obj TYPE REF TO object,
parameters TYPE ty_parameters_tt,
classname TYPE seoclsname,
END OF ty_meta_internal .
TYPES:
ty_meta_internal_tt TYPE STANDARD TABLE OF ty_meta_internal WITH DEFAULT KEY .
TYPES:
ty_meta_tt TYPE STANDARD TABLE OF ty_meta WITH DEFAULT KEY .
CONSTANTS:
BEGIN OF c_method,
get TYPE string VALUE 'GET',
post TYPE string VALUE 'POST',
put TYPE string VALUE 'PUT',
delete TYPE string VALUE 'DELETE',
END OF c_method .
METHODS constructor
IMPORTING
!ii_server TYPE REF TO if_http_server
!iv_base TYPE string
!iv_swagger_json TYPE string DEFAULT '/swagger.json'
!iv_swagger_html TYPE string DEFAULT '/swagger.html'
!iv_title TYPE string .
METHODS register
IMPORTING
!ii_handler TYPE REF TO zif_swag_handler .
METHODS run
RAISING
cx_static_check .
PROTECTED SECTION.
DATA mv_base TYPE string .
DATA mi_server TYPE REF TO if_http_server .
DATA mt_meta TYPE ty_meta_internal_tt .
DATA mv_swagger_json TYPE string .
DATA mv_swagger_html TYPE string .
DATA mv_title TYPE string .
METHODS build_parameters
IMPORTING
!is_meta TYPE ty_meta_internal
RETURNING
VALUE(rt_parameters) TYPE abap_parmbind_tab .
METHODS create_data
IMPORTING
!is_meta TYPE ty_meta_internal
RETURNING
VALUE(rr_data) TYPE REF TO data .
METHODS from_body
IMPORTING
!is_meta TYPE ty_meta_internal
!ir_ref TYPE REF TO data .
METHODS from_query
IMPORTING
!is_meta TYPE ty_meta_internal
!ir_ref TYPE REF TO data .
METHODS from_path
IMPORTING
!is_meta TYPE ty_meta_internal
!ir_ref TYPE REF TO data .
METHODS generate_spec
IMPORTING
!iv_title TYPE clike
!iv_description TYPE clike .
METHODS generate_ui
IMPORTING
!iv_json_url TYPE string
!iv_dist TYPE string DEFAULT ''
!iv_title TYPE clike DEFAULT ''
RETURNING
VALUE(rv_ui) TYPE string .
METHODS json_reply
IMPORTING
!is_meta TYPE ty_meta_internal
!it_parameters TYPE abap_parmbind_tab .
METHODS text_reply
IMPORTING
!is_meta TYPE ty_meta_internal
!it_parameters TYPE abap_parmbind_tab .
METHODS validate_parameters
IMPORTING
!it_parameters TYPE ty_parameters_tt .
ENDCLASS.
CLASS ZCL_SWAG IMPLEMENTATION.
METHOD build_parameters.
DATA: ls_parameter LIKE LINE OF rt_parameters,
lr_dref TYPE REF TO data.
FIELD-SYMBOLS: <ls_parameter> LIKE LINE OF is_meta-parameters,
<lg_comp> TYPE any,
<lg_struc> TYPE any.
lr_dref = create_data( is_meta ).
ASSIGN lr_dref->* TO <lg_struc>.
LOOP AT is_meta-parameters ASSIGNING <ls_parameter>.
ASSIGN COMPONENT <ls_parameter>-sconame OF STRUCTURE <lg_struc> TO <lg_comp>.
ASSERT sy-subrc = 0.
ls_parameter-name = <ls_parameter>-sconame.
GET REFERENCE OF <lg_comp> INTO ls_parameter-value.
INSERT ls_parameter INTO TABLE rt_parameters.
ENDLOOP.
from_path( is_meta = is_meta
ir_ref = lr_dref ).
IF is_meta-meta-method = c_method-get.
from_query( is_meta = is_meta
ir_ref = lr_dref ).
ELSE.
from_body( is_meta = is_meta
ir_ref = lr_dref ).
ENDIF.
ENDMETHOD.
METHOD constructor.
mi_server = ii_server.
mv_base = iv_base.
mv_swagger_json = iv_swagger_json.
mv_swagger_html = iv_swagger_html.
mv_title = iv_title.
ENDMETHOD.
METHOD create_data.
DATA: lo_struct TYPE REF TO cl_abap_structdescr,
lt_components TYPE cl_abap_structdescr=>component_table,
lo_typedescr TYPE REF TO cl_abap_typedescr.
FIELD-SYMBOLS: <ls_component> LIKE LINE OF lt_components,
<ls_parameter> LIKE LINE OF is_meta-parameters.
LOOP AT is_meta-parameters ASSIGNING <ls_parameter>.
APPEND INITIAL LINE TO lt_components ASSIGNING <ls_component>.
<ls_component>-name = <ls_parameter>-sconame.
lo_typedescr = zcl_swag_map_type=>get_typedescr( <ls_parameter> ).
<ls_component>-type ?= lo_typedescr.
ENDLOOP.
lo_struct = cl_abap_structdescr=>get( lt_components ).
CREATE DATA rr_data TYPE HANDLE lo_struct.
ENDMETHOD.
METHOD from_body.
DATA: lv_cdata TYPE string,
lo_writer TYPE REF TO cl_sxml_string_writer,
lv_json TYPE xstring.
FIELD-SYMBOLS: <ls_parameter> LIKE LINE OF is_meta-parameters,
<lg_comp> TYPE any,
<lg_struc> TYPE any.
ASSIGN ir_ref->* TO <lg_struc>.
LOOP AT is_meta-parameters ASSIGNING <ls_parameter>
WHERE pardecltyp = c_parm_kind-importing.
READ TABLE is_meta-meta-url-group_names FROM <ls_parameter>-sconame
TRANSPORTING NO FIELDS.
IF sy-subrc = 0.
* ignore parameters that are part of url
CONTINUE.
ENDIF.
ASSIGN COMPONENT <ls_parameter>-sconame OF STRUCTURE <lg_struc> TO <lg_comp>.
ASSERT sy-subrc = 0.
IF <ls_parameter>-type = 'STRING'.
<lg_comp> = mi_server->request->get_cdata( ).
ELSEIF <ls_parameter>-type = 'XSTRING'.
<lg_comp> = mi_server->request->get_data( ).
ELSE.
lv_cdata = mi_server->request->get_cdata( ).
lv_cdata = '{"DATA":' && lv_cdata && '}'.
lo_writer = cl_sxml_string_writer=>create( type = if_sxml=>co_xt_json ).
CALL TRANSFORMATION zdemo_json_xml_to_upper
SOURCE XML lv_cdata
RESULT XML lo_writer.
lv_json = lo_writer->get_output( ).
CALL TRANSFORMATION id
SOURCE XML lv_json
RESULT data = <lg_comp>.
ENDIF.
* multiple body input parameters not allowed
* todo, this should be validated earlier
RETURN.
ENDLOOP.
ENDMETHOD.
METHOD from_path.
DEFINE _store.
READ TABLE is_meta-meta-url-group_names INDEX &1 INTO lv_component.
IF sy-subrc = 0.
ASSIGN COMPONENT lv_component OF STRUCTURE <lg_struc> TO <lg_comp>.
ASSERT sy-subrc = 0.
<lg_comp> = lv_match&1.
ENDIF.
END-OF-DEFINITION.
DATA: lv_path TYPE string,
lv_component TYPE string,
lv_match1 TYPE string,
lv_match2 TYPE string,
lv_match3 TYPE string,
lv_match4 TYPE string,
lv_match5 TYPE string.
FIELD-SYMBOLS: <lg_comp> TYPE any,
<lg_struc> TYPE any.
ASSIGN ir_ref->* TO <lg_struc>.
lv_path = mi_server->request->get_header_field( '~path' ).
lv_path = cl_http_utility=>unescape_url( lv_path ).
FIND REGEX is_meta-meta-url-regex IN lv_path
SUBMATCHES lv_match1 lv_match2 lv_match3 lv_match4 lv_match5.
_store 1.
_store 2.
_store 3.
_store 4.
_store 5.
ENDMETHOD.
METHOD from_query.
DATA: lv_field TYPE string.
FIELD-SYMBOLS: <ls_parameter> LIKE LINE OF is_meta-parameters,
<lg_comp> TYPE any,
<lg_struc> TYPE any.
ASSIGN ir_ref->* TO <lg_struc>.
LOOP AT is_meta-parameters ASSIGNING <ls_parameter>
WHERE pardecltyp = c_parm_kind-importing.
READ TABLE is_meta-meta-url-group_names FROM <ls_parameter>-sconame
TRANSPORTING NO FIELDS.
IF sy-subrc = 0.
* ignore parameters that are part of url
CONTINUE.
ENDIF.
ASSIGN COMPONENT <ls_parameter>-sconame OF STRUCTURE <lg_struc> TO <lg_comp>.
ASSERT sy-subrc = 0.
lv_field = to_lower( <ls_parameter>-sconame ).
<lg_comp> = mi_server->request->get_form_field( lv_field ).
ENDLOOP.
ENDMETHOD.
METHOD generate_spec.
DATA: lv_spec TYPE string,
lo_spec TYPE REF TO zcl_swag_spec.
CREATE OBJECT lo_spec
EXPORTING
iv_title = iv_title
iv_description = iv_description
it_meta = mt_meta
iv_base = mv_base.
lv_spec = lo_spec->generate( ).
mi_server->response->set_cdata( lv_spec ).
mi_server->response->set_status( code = 200 reason = '200' ).
ENDMETHOD.
METHOD generate_ui.
* todo, IV_DIST not supplyed from anywhere?
DEFINE _add.
CONCATENATE rv_ui &1 cl_abap_char_utilities=>newline
INTO rv_ui ##NO_TEXT.
END-OF-DEFINITION.
_add '<!DOCTYPE html>'.
_add '<html>'.
_add '<head>'.
_add '<meta charset="UTF-8">'.
_add '<title>'.
IF iv_title IS INITIAL.
_add 'Swagger UI'.
ELSE.
_add iv_title.
ENDIF.
_add '</title>'.
_add '<link href="iv_dist/swagger-ui.css" media="screen" rel="stylesheet" type="text/css"/>'.
_add '<script src="iv_dist/swagger-ui-bundle.js" type="text/javascript"></script>'.
_add '<script src="iv_dist/swagger-ui-standalone-preset.js" type="text/javascript"></script>'.
_add '</head>'.
_add '<body>'.
_add '<div id="swagger-ui"></div>'.
_add '<script type="text/javascript">'.
_add 'window.onload = function() {'.
_add 'const ui = SwaggerUIBundle({'.
_add ' url: "swagger.json",'.
_add ' validatorUrl: "",'.
_add ' dom_id: "#swagger-ui",'.
_add ' presets: ['.
_add ' SwaggerUIBundle.presets.apis,'.
_add ' Array.isArray(SwaggerUIStandalonePreset) ? SwaggerUIStandalonePreset : SwaggerUIStandalonePreset.default'.
_add ' ],'.
_add ' plugins: ['.
_add ' SwaggerUIBundle.plugins.DownloadUrl'.
_add ' ],'.
_add ' layout: "StandaloneLayout"'.
_add '})'.
_add 'window.ui = ui'.
_add '}'.
_add '</script>'.
_add '</body>'.
_add '</html>'.
IF iv_dist IS INITIAL.
REPLACE ALL OCCURRENCES OF 'iv_dist'
IN rv_ui WITH 'http://cdnjs.cloudflare.com/ajax/libs/swagger-ui/3.0.5/'.
ELSE.
REPLACE ALL OCCURRENCES OF 'iv_dist'
IN rv_ui WITH iv_dist ##NO_TEXT.
ENDIF.
REPLACE FIRST OCCURRENCE OF 'swagger.json'
IN rv_ui WITH iv_json_url ##NO_TEXT.
mi_server->response->set_cdata( rv_ui ).
mi_server->response->set_status( code = 200 reason = '200' ).
ENDMETHOD.
METHOD json_reply.
DATA: lv_data TYPE xstring,
lo_writer TYPE REF TO cl_sxml_string_writer.
FIELD-SYMBOLS: <ls_meta> LIKE LINE OF is_meta-parameters,
<ls_parameter> LIKE LINE OF it_parameters,
<lg_struc> TYPE any.
READ TABLE is_meta-parameters ASSIGNING <ls_meta>
WITH KEY pardecltyp = c_parm_kind-returning.
IF sy-subrc = 0.
READ TABLE it_parameters ASSIGNING <ls_parameter>
WITH KEY name = <ls_meta>-sconame.
ASSERT sy-subrc = 0.
lo_writer = cl_sxml_string_writer=>create( if_sxml=>co_xt_json ).
ASSIGN <ls_parameter>-value->* TO <lg_struc>.
CALL TRANSFORMATION id
SOURCE data = <lg_struc>
RESULT XML lo_writer.
lv_data = lo_writer->get_output( ).
ENDIF.
mi_server->response->set_data( lv_data ).
ENDMETHOD.
METHOD register.
DATA: ls_meta LIKE LINE OF mt_meta,
lt_meta TYPE ty_meta_tt,
lo_obj TYPE REF TO cl_abap_objectdescr.
lt_meta = ii_handler->meta( ).
LOOP AT lt_meta INTO ls_meta-meta.
ls_meta-obj = ii_handler.
lo_obj ?= cl_abap_objectdescr=>describe_by_object_ref( ii_handler ).
READ TABLE lo_obj->methods
WITH KEY name = ls_meta-meta-handler
visibility = cl_abap_objectdescr=>public
TRANSPORTING NO FIELDS.
* method must exist and be public
ASSERT sy-subrc = 0.
ls_meta-classname = lo_obj->absolute_name+7.
SELECT * FROM seosubcodf
INTO TABLE ls_meta-parameters
WHERE clsname = ls_meta-classname
AND cmpname = ls_meta-meta-handler
AND sconame NOT LIKE 'ZCX_%'
ORDER BY PRIMARY KEY. "#EC CI_SUBRC
ASSERT sy-subrc = 0.
validate_parameters( ls_meta-parameters ).
APPEND ls_meta TO mt_meta.
CLEAR ls_meta.
ENDLOOP.
ENDMETHOD.
METHOD run.
DATA: lv_path TYPE string,
lv_method TYPE string,
lt_parameters TYPE abap_parmbind_tab.
FIELD-SYMBOLS: <ls_meta> LIKE LINE OF mt_meta.
lv_path = mi_server->request->get_header_field( '~path' ).
lv_path = cl_http_utility=>unescape_url( lv_path ).
lv_method = mi_server->request->get_method( ).
IF lv_path = mv_base && mv_swagger_html.
generate_ui(
iv_json_url = mv_base && mv_swagger_json
iv_title = mv_title && ' - Swagger' ).
RETURN.
ELSEIF lv_path = mv_base && mv_swagger_json.
generate_spec(
iv_title = mv_title
iv_description = mv_title && ' REST functions' ).
RETURN.
ENDIF.
LOOP AT mt_meta ASSIGNING <ls_meta>.
IF lv_method <> <ls_meta>-meta-method.
CONTINUE.
ENDIF.
FIND REGEX <ls_meta>-meta-url-regex IN lv_path.
IF sy-subrc = 0.
lt_parameters = build_parameters( <ls_meta> ).
CALL METHOD <ls_meta>-obj->(<ls_meta>-meta-handler)
PARAMETER-TABLE lt_parameters.
mi_server->response->set_compression( ).
LOOP AT <ls_meta>-parameters
TRANSPORTING NO FIELDS
WHERE pardecltyp = c_parm_kind-returning
AND ( type = 'STRING' OR type = 'XSTRING' ).
EXIT.
ENDLOOP.
IF sy-subrc = 0.
text_reply( is_meta = <ls_meta>
it_parameters = lt_parameters ).
ELSE.
json_reply( is_meta = <ls_meta>
it_parameters = lt_parameters ).
ENDIF.
mi_server->response->set_status( code = 200 reason = '200' ).
RETURN.
ENDIF.
ENDLOOP.
mi_server->response->set_cdata( '404 swagger' ).
mi_server->response->set_status( code = 404 reason = '404' ).
ENDMETHOD.
METHOD text_reply.
FIELD-SYMBOLS: <lg_any> TYPE any,
<ls_meta> LIKE LINE OF is_meta-parameters,
<ls_parameter> LIKE LINE OF it_parameters.
READ TABLE is_meta-parameters ASSIGNING <ls_meta>
WITH KEY pardecltyp = c_parm_kind-returning.
IF sy-subrc = 0.
READ TABLE it_parameters ASSIGNING <ls_parameter>
WITH KEY name = <ls_meta>-sconame.
ASSERT sy-subrc = 0.
ASSIGN <ls_parameter>-value->* TO <lg_any>.
CASE <ls_meta>-type.
WHEN 'XSTRING'.
mi_server->response->set_data( <lg_any> ).
WHEN 'STRING'.
mi_server->response->set_cdata( <lg_any> ).
WHEN OTHERS.
ASSERT 0 = 1.
ENDCASE.
ENDIF.
ENDMETHOD.
METHOD validate_parameters.
* no EXPORTING, no CHANGING
LOOP AT it_parameters TRANSPORTING NO FIELDS
WHERE pardecltyp = c_parm_kind-exporting
OR pardecltyp = c_parm_kind-changing.
ASSERT 0 = 1.
ENDLOOP.
* no reference types
* todo
* todo, max one importing parameter? apart from path parameters?
ENDMETHOD.
ENDCLASS.