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schema_validator.c
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schema_validator.c
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#include "schema_validator.h"
#include "utils.h"
#define MAX_CONSTRAINTS 8 // maximum number of constraints when validating keyword values(or children values)
char* json_keywords_char[] = {[json_keyword_multipleOf] = "multipleOf",
[json_keyword_maximum] = "maximum",
[json_keyword_minimum] = "minimum",
[json_keyword_exclusiveMinimum] = "exclusiveMinimum",
[json_keyword_exclusiveMaximum] = "exclusiveMaximum",
[json_keyword_maxLength] = "maxLength",
[json_keyword_minLength] = "minLength",
[json_keyword_pattern] = "pattern",
[json_keyword_additionalItems] = "additionalItems",
[json_keyword_items] = "items",
[json_keyword_minItems] = "minItems",
[json_keyword_maxItems] = "maxItems",
[json_keyword_uniqueItems] = "uniqueItems",
[json_keyword_maxProperties] = "maxProperties",
[json_keyword_minProperties] = "minProperties",
[json_keyword_required] = "required",
[json_keyword_properties] = "properties",
[json_keyword_patternProperties] = "patternProperties",
[json_keyword_additionalProperties] = "additionalProperties",
[json_keyword_dependencies] = "dependencies",
[json_keyword_enum] = "enum",
[json_keyword_type] = "type",
[json_keyword_allOf] = "allOf",
[json_keyword_anyOf] = "anyOf",
[json_keyword_oneOf] = "oneOf",
[json_keyword_not] = "not",
[json_keyword_definitions] = "definitions",
[json_keyword_title] = "title",
[json_keyword_description] = "description",
[json_keyword_default] = "default",
[json_keyword_format] = "format",
[json_keyword_schema] = "$schema"
};
char * json_keywords_constraints[][6] = {{"multipleOf","2 | 3","3 | 7", "-1","0","-1"},
{"maximum","2 | 3","3 | 7", "-1","-1","-1"},
{"minimum","2 | 3","3 | 7", "-1","-1","-1"},
{"exclusiveMinimum","1","3 | 7", "2","-1","-1"},
{"exclusiveMaximum","1","3 | 7", "1","-1","-1"},
{"maxLength","3","6", "-1","1","-1"},
{"minLength","3","6", "-1","1","-1"},
{"pattern","6","6", "-1","4","-1"},
{"additionalItems","1 | 4","5", "-1","-1","-1"},
{"items","4 | 5","5", "-1","2","-1"},
{"minItems","3","5", "-1","1","-1"},
{"maxItems","3","5", "-1","1","-1"},
{"uniqueItems","1","5", "-1","-1","-1"},
{"maxProperties","3","4", "-1","1","-1"},
{"minProperties","3","4", "-1","1","-1"},
{"required","5","4", "-1","3","-1"},
{"properties","4","4", "-1","-1","-1"},
{"patternProperties","4","4", "-1","5","-1"},
{"additionalProperties","1 | 4","4", "-1","-1","-1"},
{"dependencies","4","4", "-1","-1","3 | 9"},
{"enum","5","-1", "-1","6","-1"},
{"type","6","-1", "-1","7","-1"},
{"allOf","5","-1", "-1","2","-1"},
{"anyOf","5","-1", "-1","2","-1"},
{"oneOf","5","-1", "-1","2","-1"},
{"not","4","-1", "-1","-1","-1"},
{"definitions","4","-1", "-1","-1","-1"},
{"title","6","-1", "-1","-1","-1"},
{"description","6","-1", "-1","-1","-1"},
{"default","-1","-1", "-1","-1","-1"},
{"format","6","-1", "-1","7","-1"},
{"$schema","6","-1", "-1","-1","-1"},// not handled yet, just add it to not get errors when it is present
};
struct json_enum_to_string_map json_types_id[] = {{.ikey = json_type_null, .skey = "null" },
{.ikey = json_type_boolean, .skey = "boolean"},
{.ikey = json_type_double, .skey = "double"},
{.ikey = json_type_int, .skey = "integer"},
{.ikey = json_type_object, .skey ="object"},
{.ikey = json_type_array, .skey ="array"},
{.ikey = json_type_string, .skey ="string"},
{.ikey = 7, .skey ="number"},
{0,NULL}
};
char *json_values[] = {[json_format_date_time] = "date-time",
[json_format_email] = "email",
[json_format_hostname] = "hostname",
[json_format_ipv4] = "ipv4",
[json_format_ipv6] = "ipv6",
[json_format_uri] = "uri", //format keyword
"null","boolean","double","integer","number","object","array","string",// 7 primitive types of json-c + "number" is allowed in v4 draft
NULL
};
char *json_format_regex[] = {[json_format_date_time] = "^([0-9]{4})-([0-9]{2})-([0-9]{2})"
"([Tt]([0-9]{2}):([0-9]{2}):([0-9]{2})(\\.[0-9]+)?)?"
"([Tt]([0-9]{2}):([0-9]{2}):([0-9]{2})(\\.[0-9]+)?)?"
"(([Zz]|([+-])([0-9]{2}):([0-9]{2})))?",
[json_format_email] = "^[A-Z0-9._%+\\-]+@[A-Z0-9.-]+\\.[A-Z]{2,10}$",
[json_format_hostname] = "(?:[^0-9][a-zA-Z0-9]+(?:(?:\\-|\\.)[a-zA-Z0-9]+)*)",
[json_format_ipv4] = "*",
[json_format_ipv6] = "*",
[json_format_uri] = "^([A-Z][-A-Z0-9+&@#/%=~_|]*)://"
"[-A-Za-z0-9+&@#/%?=~_|!:,.;]*[-A-Z0-9+&@#/%=~_|]$" //format keyword
};
int
json_get_keyword_id(const char *keyword){
int i, size = sizeof(json_keywords_char)/sizeof(json_keywords_char[0]);
for(i = 0; i< size; i++)
if(strcmp(keyword, json_keywords_char[i]) == 0){
return i;
}
return -1;
}
int
json_get_key_type(json_object * obj){
struct lh_entry *type_entry = lh_table_lookup_entry(json_object_get_object(obj),"type");
//assume its an object(id=4) by default
int key_type = json_type_object, i; // json-c types + "number" type
//lookup the type in the schema key
if(type_entry != NULL){
//get the type id from our private array
for(i=0; json_types_id[i].skey; i++){
if(strcmp(json_types_id[i].skey, json_object_get_string((json_object*)type_entry->v))==0){
key_type = json_types_id[i].ikey;
break;
}
}
}
return key_type;
}
int
json_validate_array_items_uniqueness(json_object *jobj, const int type){
if(json_object_get_type(jobj) != json_type_array)
{
json_printf_colored(ANSI_COLOR_RED,"type must be array.");
return 0;
}
int arraylen = json_object_array_length(jobj); /*Getting the length of the array*/
int i;
//sort the array
json_object_array_sort(jobj,json_sort_fn);
//verify that every item is unique
for (i=0; i< arraylen-1; i++){
json_object * jvalue = json_object_array_get_idx(jobj, i);
json_object * jvalue1 = json_object_array_get_idx(jobj, i+1);
if(type != -1)
if(json_object_get_type(jvalue) != type)
return 0; // not valid type
if(strcmp(json_object_to_json_string(jvalue),json_object_to_json_string(jvalue1)) == 0)
return 0; //not unique
}
return 1;
}
int
json_validate_array_items(json_object *jobj) {
if(json_object_get_type(jobj) != json_type_array)
{
json_printf_colored(ANSI_COLOR_RED,"type must be array.");
return 0;
}
enum json_type type;
int arraylen = json_object_array_length(jobj); /*Getting the length of the array*/
int i;
json_object * jvalue;
//loop through array items
for (i=0; i< arraylen; i++){
jvalue = json_object_array_get_idx(jobj, i); /*Getting the array element at position i*/
type = json_object_get_type(jvalue);
if (type != json_type_object) {
printf("array item #%d must be an object",i);
return 0;
}
}
return 1;
}
int
json_is_keyword(const char* keyword){
int array_size = sizeof(json_keywords_char)/sizeof(json_keywords_char[0]);
int i;
for(i=0 ; i < array_size ; i++){
if(strcmp(keyword,json_keywords_char[i]) == 0){
return i; // return the position of the keyword
}
}
return -1; // not found
}
void
json_split_str(const int keyword_position, int *return_array, const int str_pos){
//find the keyword type
int i=0;
char *p = json_keywords_constraints[keyword_position][str_pos];
while (*p) { // While there are more characters to process...
if (isdigit(*p)) { // Upon finding a digit, ...
int val = strtol(p, &p, 10); // Read a number, ...
return_array[i++] = val;
}else if(*p == '-' || *p == '+') {
int val = strtol(p, &p, 10); // Read a number, ...
return_array[i++] = val;
}
else {
p++;
}
}
}
int
json_validate_regex(const char * regex){
//pattern must conform the ECMA 262
regex_t pattern;
memset(&pattern, 0, sizeof(regex_t));
int err;
if((err = regcomp(&pattern, regex,REG_EXTENDED | REG_NOSUB))){
char buffer[256];
regerror(err,&pattern,buffer,sizeof(buffer)/sizeof(buffer[0]));
char buff[256];
sprintf(buff,"invalid pattern with error: %s", buffer);
json_printf_colored(ANSI_COLOR_RED , buff);
return 0;
}
return 1;
}
int
json_validate_parent_type(const char *type, const int keyword_position){
//there should be at maximum two types for the parent
int parent_type[2] = {8,8};
int i;
json_split_str(keyword_position,parent_type,2);
//if a parent type validation is not required, return directly
if(parent_type[0] == -1)
return 1;
//get parent type id
for(i=0; json_types_id[i].skey; i++){
if(strcmp(type,json_types_id[i].skey) == 0)
if( json_types_id[i].ikey == parent_type[0] || json_types_id[i].ikey == parent_type[1])
return 1;
}
return 0;
}
int
json_validate_value_regex(const char *key, json_object *value){
/* search for the regex in the regex array */
char *regex="*";
int i;
for(i=0; json_format_regex[i]; i++)
if(strcmp(json_values[i], key) == 0){
regex = json_format_regex[i];
break;
}
/* compile the regex */
//pattern must conform the ECMA 262
regex_t pattern;
memset(&pattern, 0, sizeof(regex_t));
int err;
if((err = regcomp(&pattern, regex,REG_EXTENDED | REG_NOSUB))){
char buffer[256];
regerror(err,&pattern,buffer,sizeof(buffer)/sizeof(buffer[0]));
json_printf_colored(ANSI_COLOR_RED , "invalid pattern with error: %s", buffer);
return 0;
}
return 1;
}
int
json_validate_type(const int type, const int keyword_position){
int allowed_types[8] = {8,8,8,8,8,8,8,8}; //max 7 types
int i;
json_split_str(keyword_position,allowed_types,1);
for(i=0;i<8;i++){
if(allowed_types[i] == -1)
return 1;
if(type == allowed_types[i]) {
return 1;
}else if(allowed_types[i] > 6)
//w've reached the number of types
break;
}
return 0;
}
int
json_check_dependencies(const int keyword_position, lh_table* parent){
int dep = atoi(json_keywords_constraints[keyword_position][3]); // position of the required keyword
if(dep > -1){
char * dep_keyword = json_keywords_constraints[dep][0] ; // the keyword our keyword depends on
if (lh_table_lookup_entry(parent,dep_keyword) == NULL ){
//need to be discussed
// //if we have the allOf, oneOf, anyOf or not keywords, they may contain our dependency.
// struct lh_entry* temp;
// if((temp = lh_table_lookup_entry(parent, "anyOf")) != NULL){
// printf("ANYOF FOUND!\n");
// if (lh_table_lookup_entry(json_object_get_object((json_object*)temp->v),dep_keyword) != NULL )
// return 1;
// }
// if((temp = lh_table_lookup_entry(parent, "allOf")) != NULL){
// printf("ALLOF FOUND! %s %d \n",(char*) temp->k,json_object_get_type((json_object*)temp->v));
// if (lh_table_lookup_entry(json_object_get_object((json_object*)temp->v),dep_keyword) != NULL )
// return 1;
// }
// if((temp = lh_table_lookup_entry(parent, "oneOf")) != NULL){
// printf("ONEOF FOUND! \n");
// if (lh_table_lookup_entry(json_object_get_object((json_object*)temp->v),dep_keyword) != NULL )
// return 1;
// }
// if((temp = lh_table_lookup_entry(parent, "not")) != NULL){
// printf("NOT FOUND! \n");
// if (lh_table_lookup_entry(json_object_get_object((json_object*)temp->v),dep_keyword) != NULL )
// return 1;
// }
return 0;
}
}
return 1;
}
int
json_check_allowed_values(const int keyword_position,struct json_object * value, struct lh_table* parent, const int items_values){
int allowed_values[MAX_CONSTRAINTS], i, res = 1;
if(items_values == 1)
json_split_str(keyword_position,(int *)&allowed_values,5); // get allowed children values ID
else
json_split_str(keyword_position,(int *)&allowed_values,4); // get allowed values ID
const char *key = json_keywords_constraints[keyword_position][0];
const int array_length = sizeof(json_values)/sizeof(json_values[0]);
for(i=0; i< MAX_CONSTRAINTS; i++){
switch(allowed_values[i]) {
case json_strictly_gt_0:
if(json_object_get_int(value) < 1){
printf("value: %d\n",json_object_get_int(value));
json_printf_colored(ANSI_COLOR_RED ,"value must be strictly greater than 0. ");
res = 0;
}
break;
case json_gt_or_eqt_0:
if(json_object_get_int(value) < 0){
printf("value: %d\n",json_object_get_int(value));
json_printf_colored(ANSI_COLOR_RED ,"value must be greater than or equal to 0. ");
res = 0;
}
break;
case json_array_of_ojbects:
if(json_object_get_type(value) == json_type_array)
res = json_validate_array_items(value);
break;
case json_array_of_unique_string_items_at_least_one_item:
if(json_object_get_type(value) == json_type_array){
if(json_object_array_length(value) < 1){
json_printf_colored(ANSI_COLOR_RED,"at least one item must be present in the array");
res = 0;
}
res = json_validate_array_items_uniqueness(value,6);
}
break;
case json_valid_regex:
if(json_object_get_type(value) == json_type_string)
res = json_validate_regex(json_object_get_string(value));
break;
case json_name_valid_regex:
res = json_validate_regex(key);
break;
case json_array_of_unique_items_at_least_one_item:
if(json_object_get_type(value) == json_type_array){
if(json_object_array_length(value) < 1){
json_printf_colored(ANSI_COLOR_RED,"at least one item must be present in the array");
res = 0;
}
res = json_validate_array_items_uniqueness(value,-1); // no specific type is required
}
break;
case json_value_in_an_array_of_values:
if(json_object_get_type(value) == json_type_string)
for(i=0; i<array_length; i++)
if(strcmp(json_object_get_string(value),json_values[i]) == 0)
return 1;
res = 0;
break;
case json_value_matches_regex:
res = json_validate_value_regex(key, value);
case json_value_is_object:
default:
res = 1 ;
}
if(res == 1)
break; //if one constraint succed, return success
}
return res;
}
int
json_validate_keyword(struct lh_entry* keyword, struct lh_table* parent){
char * keyword_name = (char*)keyword->k;
int keyword_position; // position in the keywords array
struct json_object * value = (struct json_object *)keyword->v;
enum json_type keyword_type = json_object_get_type(value);
//check if it is a keyword or not
if((keyword_position = json_is_keyword(keyword_name)) != -1){
char * parent_type_value = "object"; //assume its an object from the beginning
struct lh_entry* parent_type = lh_table_lookup_entry(parent,"type");
if(parent_type == NULL ) {
json_printf_colored(ANSI_COLOR_YELLOW,"---parent type not found assuming its an object" );
}else{
struct json_object * parent_type_object = (struct json_object * ) parent_type->v;
//if the type is an array with more than an element, exit with an error.
if(json_object_get_type(parent_type_object) == json_type_array){
if(json_object_array_length(parent_type_object)>1) {
json_printf_colored(ANSI_COLOR_RED,"array type of more than one item is not allowed");
return 0;
}
struct json_object * item_value= json_object_array_get_idx(parent_type_object,0);
//item should be a string
if(json_object_get_type(item_value) != json_type_string){
json_printf_colored(ANSI_COLOR_RED,"type: array item should be a string");
return 0;
}
parent_type_value = (char*) json_object_get_string(item_value);
}else if(json_object_get_type(parent_type_object) == json_type_string) {
parent_type_value = (char*) json_object_get_string(parent_type_object);
}else{
json_printf_colored(ANSI_COLOR_RED,"type: value type should be either a string or an array");
return 0;
}
//check parent type is valid
if(json_validate_parent_type(parent_type_value,keyword_position) != 1){
json_printf_colored(ANSI_COLOR_RED,"Invalid parent type");
return 0;
}
}
//check type is valid
if(json_validate_type(keyword_type,keyword_position) != 1){
json_printf_colored(ANSI_COLOR_RED,"Invalid type");
return 0;
}
if(json_check_dependencies(keyword_position,parent) != 1){
json_printf_colored(ANSI_COLOR_RED,"dependencies missing");
return 0;
}
/* validate values */
if(json_check_allowed_values(keyword_position, (struct json_object*)keyword->v, parent, 0) != 1){
json_printf_colored(ANSI_COLOR_RED,"bad values");
return 0;
}
if(json_object_is_type((struct json_object*)keyword->v, json_type_object)){
/* validate children values */
struct lh_entry *child;
lh_foreach(json_object_get_object((struct json_object*)keyword->v),child){
if(json_check_allowed_values(keyword_position, (struct json_object*)child->v, json_object_get_object((struct json_object*)keyword->v), 1) != 1)
{
json_printf_colored(ANSI_COLOR_RED,"bad children values");
return 0;
}
}
}
}
return 1;
}
int
json_validate_object(json_object *jobj, const int last_pos) {
struct lh_table* object_table = json_object_get_object(jobj);
struct lh_entry* entry = object_table->head;
enum json_type type;
static int res = 1;
int obj_pos = 1 + last_pos;
while(entry != NULL) {
char * key = (char*)entry->k;
struct json_object * value = (struct json_object *)entry->v;
int result;
printf("**key: %*s\n", (int) strlen(key)+(obj_pos*2),key);
type = json_object_get_type(value);
//validate the keyword of the object first
result = json_validate_keyword(entry,object_table);
if (result != 1)
res = res && 0; // schema is not valid, but keep checking to get all errors.
if(type == json_type_object)
json_validate_object(value,obj_pos);
entry = entry->next;
}
return res;
}
int
json_validate_schema(struct json_object *schema) {
int res;
if (!schema)
return 0;
res = json_validate_object(schema,0);
if(res != 1) {
json_printf_colored(ANSI_COLOR_RED,"Invalid schema!");
return 0;
}else {
json_printf_colored(ANSI_COLOR_GREEN,"Valid schema!");
return 1;
}
}
int
json_validate_schema_from_file(const char* filename) {
int res;
json_object *schema = json_object_from_file(filename);
if(schema == NULL) {
json_printf_colored("could not load schema from file.",ANSI_COLOR_RED);
return 0;
}
return json_validate_schema(schema);
}