![]() ![]() They are particularlyĭistinct from the rules for markup languages, including JavaScript (see above). ![]() The rules for XSS include all the rules for individual formats, plus some extra rules. Rules exist for XML/HTML content, JavaScript content, Cascading Style Sheets (CSS), and URL content. ( XSS) on Web applications to be prevented. that enable attacks using Cross Site Scripting The program DEMO_ESCAPE_XSS demonstrates the escape rules of the formats E_XSS_. On the character, one to four bytes are represented in the form %hh, where hh is the hexadecimal value of a byte.Ĭl_demo_output => display ( escape ( val = 'Special characters: |, \, ' format = cl_abap_format => e_string_tpl ) ). , _,, =, ~, Īll characters with codes from x80 are converted to their In URI_1 format, quotation marks are not converted to %hh, but are doubled. (except for the characters listed in the following table), where hh is All characters with codes between x00 and 7F are converted to %hh The program DEMO_ESCAPE_URL_URI demonstrates the escape rules for URLsĪnd URIs. If there is no value in a field (-), the special character is not affected.Ĭl_demo_output => display ( escape ( val = 'IF a e_xml_text ) ). To \xhh, where "hh" is the hexadecimal value of the code. X20 that are not covered by those characters listed explicitly. X0A, x0D, x08, and x0C are assigned in 7-Bit ASCII.Ĭtrl-char stands for all control characters with codes less than Tabulator, Line Feed, Carriage Return, Backspace, and Form Feed, to which the codes x09, None of the other charactersīS, and FF are the control characters for Show the escape characters that replace the special characters in the first row. The first column contains the names of the formats from the class CL_ABAP_FORMAT. The following table summarizes the escape rules: Formats with "_JS" in their name are intended for content with JavaScript components. The program DEMO_ESCAPE_MARKUP demonstrates the escape rules for markup ![]() Rules for Markup Languages (Including JavaScript) Rules for Markup Languages (Including JavaScript).This function can be specified in general andĬharacter-like expression positions. The other rows show the effect on the characters specified in the first two columns. The names of the constants from the class CL_ABAP_FORMAT without the prefix "E_". Invalid value for format raises an exception of the class CX_SY_STRG_PAR_VAL.įor all characters whose codes are between x00 and xFF, the program DEMO_ESCAPEĭemonstrates the effect of all associated formats from the class CL_ABAP_FORMAT. An important part is also played by attack protection using Cross Site Scripting (XSS) on Web applications.įormat expects data objects of the type i. HTML), in URIs and URLs, in JSON, as well as in regular expressions and character string templates. There are rules for special characters in markup languages (XML and Each value defines which specialĬharacters are replaced, and how. ![]() The possible values of format are defined as constants with the prefix Text, and hides certain special characters with escape characters according to a rule specified in format. This function gets the content of the character string in Processing Functions for Character-Like Arguments escape - Escape Function Character String and Byte String Processing →Įxpressions and Functions for String Processing → ![]()
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