src/server/util/object.h

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2013 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef OBJECT_H
#define	OBJECT_H

#include "../public/nsapi.h"
#include "pool.h"

#include <inttypes.h>
#include <cx/list.h>

#ifdef	__cplusplus
extern "C" {
#endif

// TODO: Enum auslagern in andere Datei?
enum RequestStage {
    NSAPIAuthTrans = 0,
    NSAPINameTrans,
    NSAPIPathCheck,
    NSAPIObjectType,
    NSAPIService,
    NSAPIError,
    NSAPIAddLog,
    REQ_FINISH,
    NUM_NSAPI_TYPES
};
typedef enum RequestStage RequestStage;

typedef struct Condition          Condition;
typedef int8_t                    ConditionResult;
typedef struct Expression         Expression;
typedef enum OperandType          OperandType;
typedef enum Operator             Operator;
typedef enum VarType              VarType;

typedef struct NSAPIContext       NSAPIContext;
typedef struct HTTPObjectConfig   HTTPObjectConfig;

struct directive {
    FuncStruct *func;
    pblock     *param;
    Condition  *cond;
};

struct dtable {
    directive **dirs;
    int       ndir;
    int       alloc;
};

struct httpd_object {
    pool_handle_t *pool;
    char          *name;
    char          *path;
    dtable        *dt;
    int           nd;
};

struct httpd_objset {
    httpd_object **obj;
    int pos;
};

struct Condition {
    Condition       *parent;
    Condition       *ifnot;
    Expression      *expression;
    int             depth;
    int             index; // used by NSAPIContext to link expression with result
};

struct Expression {
    // TODO
    int n;
};


struct NSAPIContext{
    HTTPObjectConfig  *conf;

    ConditionResult   **results;
    int               nres;
    int               nmaxres;

    //httpd_objset      *objset;
    int last_req_code;

    int objset_index;
    int dtable_index;
};

struct HTTPObjectConfig {
    httpd_object  **objects;
    int           nobj;
    pool_handle_t *pool;
    uint32_t      ref; // reference counter
};


typedef struct NSAPIExpression         NSAPIExpression;
typedef enum NSAPIExpressionType       NSAPIExpressionType;
typedef enum NSAPIExpressionOperator   NSAPIExpressionOperator;

enum NSAPIExpressionType {
    NSAPI_EXPRESSION_BOOL = 0,
    NSAPI_EXPRESSION_INT,
    NSAPI_EXPRESSION_DOUBLE,
    NSAPI_EXPRESSION_STRING,
    NSAPI_EXPRESSION_VARIABLE,
    NSAPI_EXPRESSION_LOGICAL,
    NSAPI_EXPRESSION_UNARY,
    NSAPI_EXPRESSION_BINARY,
    NSAPI_EXPRESSION_IDENTIFIER
};

enum NSAPIExpressionOperator {
    NSAPI_EXPRESSION_NOOP = 0,
    NSAPI_EXPRESSION_CALL,
    NSAPI_EXPRESSION_ARG,
    NSAPI_EXPRESSION_NOT,
    NSAPI_EXPRESSION_AND,
    NSAPI_EXPRESSION_OR,
    NSAPI_EXPRESSION_XOR,
    NSAPI_EXPRESSION_EQ,
    NSAPI_EXPRESSION_NEQ,
    NSAPI_EXPRESSION_GT,
    NSAPI_EXPRESSION_LT,
    NSAPI_EXPRESSION_GE,
    NSAPI_EXPRESSION_LE,
    NSAPI_EXPRESSION_ADD,
    NSAPI_EXPRESSION_SUB,
    NSAPI_EXPRESSION_MUL,
    NSAPI_EXPRESSION_DIV,
    NSAPI_EXPRESSION_MOD
};

union NSAPIExpressionValue {
    cxstring str;
    cxstring var;
    int64_t  i;
    double   f;
    int      b;
};

struct NSAPIExpression {
    // value.ptr is not null if
    // type is one of (bool, int, string): literal text
    // type is variable: variable name
    union NSAPIExpressionValue value;
    
    NSAPIExpressionType type;
    
    NSAPIExpressionOperator operator;
    
    /*
     * left/single operand
     */
    NSAPIExpression *left;
    
    /*
     * right operand or NULL
     */
    NSAPIExpression *right;
};


/*
 * creates a new httpd_object
 */
httpd_object* object_new(pool_handle_t *pool, char *name);

/*
 * frees an httpd_object
 */
void object_free(httpd_object *obj);

/*
 * adds a directive to the object with the type dt (enum RequestPhase)
 */
int object_add_directive(httpd_object *obj, directive *dir, int dt);

/*
 * get a list of all directives with a specific type
 */
#define object_get_dtable(obj,type) &obj->dt[type];


/*
 * creates a new httpd_objset
 */
httpd_objset* objset_create(pool_handle_t *pool);

/*
 * adds a object to the objset
 */
void objset_add_object(pool_handle_t *p, httpd_objset *os, httpd_object *obj);


/*
 * creates a new HTTPObjectConfig
 */
// TODO

/*
 * adds an object to the object configuration
 */
void httpobjconf_add_object(HTTPObjectConfig *conf, httpd_object *obj);


/*
 * prepares the NSAPI context for the next request stage
 */
void nsapi_context_next_stage(NSAPIContext *context);


/*
 * parses an expression from a list of cxstring tokens and compiles the
 * expression into an Expression object
 * 
 * tokens: CxList that contains cxstring
 */
Expression* condition_create(pool_handle_t *pool, CxList *tokens);

NSAPIExpression* expr_parse_logical_expr(pool_handle_t *pool, CxList *tokens, size_t *pos);

int condition_evaluate(Condition *condition, Session *sn, Request *rq);


#ifdef	__cplusplus
}
#endif

#endif	/* OBJECT_H */