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ngx_http_recaptcha_module.c
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ngx_http_recaptcha_module.c
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#ifndef DDEBUG
#define DDEBUG 0
#endif
#include "ddebug.h"
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
typedef struct {
ngx_uint_t body_index;
} ngx_http_recaptcha_conf_t;
static ngx_int_t ngx_http_recaptcha_form_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static char * ngx_http_add_form_variable(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static void *ngx_http_recaptcha_create_conf(ngx_conf_t *cf);
static char *ngx_http_recaptcha_merge_conf(ngx_conf_t *cf, void *parent,
void *child);
static ngx_command_t ngx_http_recaptcha_commands[] = {
{ ngx_string("recaptcha_challenge_name"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_http_add_form_variable,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
{ ngx_string("recaptcha_response_name"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_http_add_form_variable,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
ngx_null_command
};
static ngx_http_module_t ngx_http_recaptcha_module_ctx = {
NULL, /* preconfiguration */
NULL, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
ngx_http_recaptcha_create_conf, /* create location configuration */
ngx_http_recaptcha_merge_conf /* merge location configuration */
};
ngx_module_t ngx_http_recaptcha_module = {
NGX_MODULE_V1,
&ngx_http_recaptcha_module_ctx, /* module context */
ngx_http_recaptcha_commands, /* module directives */
NGX_HTTP_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
static ngx_int_t
ngx_http_recaptcha_form_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data)
{
u_char *head, *value, *last;
ngx_str_t *name;
ngx_http_recaptcha_conf_t *rcf;
ngx_http_variable_value_t *vv;
rcf = ngx_http_get_module_loc_conf(r, ngx_http_recaptcha_module);
vv = ngx_http_get_indexed_variable(r, rcf->body_index);
if (vv == NULL || vv->not_found || vv->len == 0) {
goto not_found;
}
name = (ngx_str_t *) data;
if (name == NULL) {
goto not_found;
}
// ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
// ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
dd("request_body: \"%*s\", param name = \"%V\"",
vv->len, vv->data, name);
head = ngx_strnstr((u_char *)vv->data, (char *)name->data, (size_t)vv->len);
if (head == NULL) {
goto not_found;
}
value = head + name->len;
if (*value != '=') {
goto not_found;
}
value++;
last = value;
while (last < (vv->data + vv->len)) {
if (*last == '&' || *last == CR || *last == LF) {
break;
}
last++;
}
v->data = value;
v->len = last - value;
v->valid = 1;
v->no_cacheable = 0;
v->not_found = 0;
return NGX_OK;
not_found:
v->not_found = 1;
return NGX_OK;
}
static char *
ngx_http_add_form_variable(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_str_t *value, *str;
ngx_http_variable_t *var;
value = cf->args->elts;
str = ngx_palloc(cf->pool, sizeof(ngx_str_t));
if (str == NULL) {
return NGX_CONF_ERROR;
}
*str = value[1];
if (str->data[0] == '$') {
str->data++;
str->len--;
}
var = ngx_http_add_variable(cf, str, 0);
if (var == NULL) {
return NGX_CONF_ERROR;
}
var->get_handler = ngx_http_recaptcha_form_variable;
var->data = (uintptr_t) str;
return NGX_CONF_OK;
}
static void *
ngx_http_recaptcha_create_conf(ngx_conf_t *cf)
{
dd("recaptcha create conf");
ngx_http_recaptcha_conf_t *conf;
conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_recaptcha_conf_t));
if (conf == NULL) {
return NULL;
}
/*
* set by ngx_pcalloc():
*
* conf->body_index = 0;
*/
conf->body_index = NGX_CONF_UNSET;
return conf;
}
static char *
ngx_http_recaptcha_merge_conf(ngx_conf_t *cf, void *parent, void *child)
{
dd("recaptcha merge conf");
ngx_str_t body = ngx_string("request_body");
ngx_http_recaptcha_conf_t *conf = child;
conf->body_index = ngx_http_get_variable_index(cf, &body);
if (conf->body_index == (ngx_uint_t) NGX_ERROR) {
return NGX_CONF_ERROR;
}
return NGX_CONF_OK;
}