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update.c
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update.c
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#include <stdio.h>
#include <stdlib.h>
#include <sqlite3.h>
#include <jansson.h>
#include <string.h>
#include <fcgi_stdio.h>
//gcc -o update.o update.c -lsqlite3 -ljansson -lfcgi
//sudo apt-get install libapache2-mod-fcgid
//sudo apt-get install libfcgi-dev
typedef struct {
char* id;
char* fullname;
char* email;
char* phone;
char* age;
char* gender;
char* municipality;
char* year;
char* course;
}Report;
// serialize the response and send back to client-side
void create_json_array(Report info) {
json_t *arr = json_array();
json_t *obj = json_object();
json_t *parent = json_object();
char *response_data;
json_object_set_new(obj, "id", json_string(info.id));
json_object_set_new(obj, "fullname", json_string(info.fullname));
json_object_set_new(obj, "email", json_string(info.email));
json_object_set_new(obj, "phone", json_string(info.phone));
json_object_set_new(obj, "age", json_string(info.age));
json_object_set_new(obj, "gender", json_string(info.gender));
json_object_set_new(obj, "municipality", json_string(info.municipality));
json_object_set_new(obj, "year", json_string(info.year));
json_object_set_new(obj, "course", json_string(info.course));
json_array_append_new(arr, obj);
json_object_set_new(parent, "status", json_string("success"));
json_object_set_new(parent, "message", json_string("Successfully inserted the data.."));
json_object_set_new(parent, "data", arr);
response_data = json_dumps(parent, JSON_INDENT(4));
printf("Content-Type: application/json\n\n");
printf("%s", response_data);
// use the array...
json_decref(arr); // don't forget to free memory
}
void create_json_error_responses(const char *err_msg, const char *err_msg_add) {
json_t *parent = json_object();
json_object_set_new(parent, "status", json_string("error"));
json_object_set_new(parent, "message", json_string(err_msg));
json_object_set_new(parent, "message_additional", json_string(err_msg_add));
printf("Content-Type: application/json\n\n");
printf("%s", json_dumps(parent, JSON_INDENT(4)));
}
void loadJSON(Report *info) {
long len = strtol(getenv("CONTENT_LENGTH"), NULL, 10);
char* incoming_data = malloc(len+1);
json_error_t error;
/* use for json_array_foreach */
json_t *root;
json_t *value;
size_t index;
// Read the input data from the standard input stream
fgets(incoming_data, len + 1, stdin);
//Parse the input data as JSON
root = json_loads(incoming_data, 0, &error);
if(!root) {
create_json_error_responses(error.text,NULL);
}
const char* properties[] = { "id", "fullname", "email", "phone", "age", "gender", "municipality", "year", "course" };
char** infovar[] = {&info->id,&info->fullname,&info->email,&info->phone,&info->age,&info->gender,&info->municipality,&info->year,&info->course};
//calculates the number of elements
int num_properties = sizeof(properties) / sizeof(properties[0]);
// Extract the required information from the JSON data
json_array_foreach(root, index, value) {
const char *name_holder = json_string_value(json_object_get(value, "name"));
const char *value_holder = json_string_value (json_object_get(value, "value"));
int value_holder_length = strlen(value_holder) + 1;
for (int i = 0; i < num_properties; i++) {
if (strcmp(name_holder, properties[i]) == 0) {
// re allocate db_id with equal lenght of the source
*infovar[i] = (char *) malloc(value_holder_length);
strncpy(*infovar[i],value_holder,value_holder_length);
}
}
}
free(incoming_data);
}
int main(void) {
while (FCGI_Accept() >= 0) {
Report info;
sqlite3 *db;
sqlite3_stmt *stmt;
int dbres;
const char *sql_statement = "update students set fullname=?, email=?, phone=?, age=?, gender=?, municipality=?, year=?, course=? where id=?";;
// function call
// load JSON payload from client-side and deserialize
loadJSON(&info);
dbres = sqlite3_open_v2("/var/www/ipt/bejerano/cgi-bin/db/data.db", &db, SQLITE_OPEN_READWRITE,NULL);
if (dbres != SQLITE_OK) {
create_json_error_responses(sqlite3_errmsg(db),NULL);
sqlite3_close(db);
return 1;
}
dbres = sqlite3_prepare_v2(db, sql_statement, -1, &stmt, NULL);
// bitwise operator
dbres = sqlite3_bind_text(stmt, 1, info.fullname, -1, SQLITE_TRANSIENT);
dbres |= sqlite3_bind_text(stmt, 2, info.email, -1, SQLITE_TRANSIENT);
dbres |= sqlite3_bind_text(stmt, 3, info.phone, -1, SQLITE_TRANSIENT);
dbres |= sqlite3_bind_text(stmt, 4, info.age, -1, SQLITE_TRANSIENT);
dbres |= sqlite3_bind_text(stmt, 5, info.gender, -1, SQLITE_TRANSIENT);
dbres |= sqlite3_bind_text(stmt, 6, info.municipality, -1, SQLITE_TRANSIENT);
dbres |= sqlite3_bind_text(stmt, 7, info.year, -1, SQLITE_TRANSIENT);
dbres |= sqlite3_bind_text(stmt, 8, info.course, -1, SQLITE_TRANSIENT);
dbres = sqlite3_bind_text(stmt, 9, info.id, -1, SQLITE_TRANSIENT);
if (dbres != SQLITE_OK) {
create_json_error_responses(sqlite3_errmsg(db),NULL);
sqlite3_close(db);
return 1;
} else {
char *expanded_sql = sqlite3_expanded_sql(stmt);
char *err_msg = 0;
dbres = sqlite3_exec(db, expanded_sql, 0, 0,&err_msg);
sqlite3_finalize(stmt);
if (dbres == SQLITE_OK) {
create_json_array(info);
sqlite3_close(db);
return 1;
} else {
create_json_error_responses(sqlite3_errmsg(db),expanded_sql);
sqlite3_close(db);
return 1;
}
}
return 0;
}
}
// curl -X POST -H "Content-Type: application/json" -d '[{"name": "id", "value": "2"},{"name": "name", "value": "Arnold"},{"name": "ticket", "value": "43256"}]' http://dummy.mshome.net:8081/lect/cgi-bin/midware.o
//curl -X POST -H "Content-Type: application/json" -d '[{"name": "id", "value": "2"}' http://dummy.mshome.net:8081/lect/cgi-bin/midware.o