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// HTTPFormParser.h
// Declares the cHTTPFormParser class representing a parser for forms sent over HTTP
#pragma once
#include "MultipartParser.h"
// fwd:
class cHTTPRequest;
class cHTTPFormParser :
public std::map<AString, AString>,
public cMultipartParser::cCallbacks
{
public:
enum eKind
{
fpkURL, ///< The form has been transmitted as parameters to a GET request
fpkFormUrlEncoded, ///< The form has been POSTed or PUT, with Content-Type of "application/x-www-form-urlencoded"
fpkMultipart, ///< The form has been POSTed or PUT, with Content-Type of "multipart/form-data"
} ;
class cCallbacks
{
public:
// Force a virtual destructor in descendants:
virtual ~cCallbacks() {}
/** Called when a new file part is encountered in the form data */
virtual void OnFileStart(cHTTPFormParser & a_Parser, const AString & a_FileName) = 0;
/** Called when more file data has come for the current file in the form data */
virtual void OnFileData(cHTTPFormParser & a_Parser, const char * a_Data, size_t a_Size) = 0;
/** Called when the current file part has ended in the form data */
virtual void OnFileEnd(cHTTPFormParser & a_Parser) = 0;
} ;
/** Creates a parser that is tied to a request and notifies of various events using a callback mechanism */
cHTTPFormParser(cHTTPRequest & a_Request, cCallbacks & a_Callbacks);
/** Creates a parser with the specified content type that reads data from a string */
cHTTPFormParser(eKind a_Kind, const char * a_Data, size_t a_Size, cCallbacks & a_Callbacks);
/** Adds more data into the parser, as the request body is received */
void Parse(const char * a_Data, size_t a_Size);
/** Notifies that there's no more data incoming and the parser should finish its parsing.
Returns true if parsing successful. */
bool Finish(void);
/** Returns true if the headers suggest the request has form data parseable by this class */
static bool HasFormData(const cHTTPRequest & a_Request);
protected:
/** The callbacks to call for incoming file data */
cCallbacks & m_Callbacks;
/** The kind of the parser (decided in the constructor, used in Parse() */
eKind m_Kind;
/** Buffer for the incoming data until it's parsed */
AString m_IncomingData;
/** True if the information received so far is a valid form; set to false on first problem. Further parsing is skipped when false. */
bool m_IsValid;
/** The parser for the multipart data, if used */
std::unique_ptr<cMultipartParser> m_MultipartParser;
/** Name of the currently parsed part in multipart data */
AString m_CurrentPartName;
/** True if the currently parsed part in multipart data is a file */
bool m_IsCurrentPartFile;
/** Filename of the current parsed part in multipart data (for file uploads) */
AString m_CurrentPartFileName;
/** Set to true after m_Callbacks.OnFileStart() has been called, reset to false on PartEnd */
bool m_FileHasBeenAnnounced;
/** Sets up the object for parsing a fpkMultipart request */
void BeginMultipart(const cHTTPRequest & a_Request);
/** Parses m_IncomingData as form-urlencoded data (fpkURL or fpkFormUrlEncoded kinds) */
void ParseFormUrlEncoded(void);
// cMultipartParser::cCallbacks overrides:
virtual void OnPartStart (void) override;
virtual void OnPartHeader(const AString & a_Key, const AString & a_Value) override;
virtual void OnPartData (const char * a_Data, size_t a_Size) override;
virtual void OnPartEnd (void) override;
} ;
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