/**

Copyright (c) 2012 Tatsuhiko Kubo <cubicdaiya@gmail.com>

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in

all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

THE SOFTWARE.

*/

#include <ngx_config.h>

#include <ngx_core.h>

#include <ngx_http.h>

#include <wand/MagickWand.h>

#include "ngx_http_small_light_module.h"

#include "ngx_http_small_light_param.h"

#include "ngx_http_small_light_parser.h"

#include "ngx_http_small_light_imagemagick.h"

#define NGX_HTTP_SMALL_LIGHT_IMAGE_BUFFERED 0x08

static void ngx_http_small_light_cleanup(void *data);

static void ngx_http_small_light_cleanup(void *data)

{

ngx_http_small_light_ctx_t *ctx;

ctx = (ngx_http_small_light_ctx_t *)data;

ngx_memzero(ctx, sizeof(ngx_http_small_light_ctx_t));

}

typedef enum ngx_http_small_light_image_type_t {

} ngx_http_small_light_image_type_t;

static char *ngx_http_small_light_image_types[] = {

[NGX_HTTP_SMALL_LIGHT_IMAGE_TYPE_JPEG] = "image/jpeg",

[NGX_HTTP_SMALL_LIGHT_IMAGE_TYPE_GIF] = "image/gif",

[NGX_HTTP_SMALL_LIGHT_IMAGE_TYPE_PNG] = "image/png",

};

static void *ngx_http_small_light_create_srv_conf(ngx_conf_t *cf);

static void *ngx_http_small_light_create_loc_conf(ngx_conf_t *cf);

static char *ngx_http_small_light_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child);

static char *ngx_http_small_light_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child);

static char *ngx_http_small_light_pattern_define(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);

static ngx_int_t ngx_http_small_light_image_read(ngx_http_request_t *r, ngx_chain_t *in, ngx_http_small_light_ctx_t *ctx);

static ngx_int_t ngx_http_small_light_finish(ngx_http_request_t *r, ngx_chain_t *out);

static ngx_int_t ngx_http_small_light_init(ngx_conf_t *cf);

static ngx_command_t ngx_http_small_light_commands[] = {

{

ngx_string("small_light"),

NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,

ngx_conf_set_flag_slot,

NGX_HTTP_LOC_CONF_OFFSET,

offsetof(ngx_http_small_light_conf_t, enable),

NULL

},

{

ngx_string("small_light_pattern_define"),

NGX_HTTP_SRV_CONF|NGX_CONF_TAKE2,

ngx_http_small_light_pattern_define,

NGX_HTTP_SRV_CONF_OFFSET,

0,

NULL

},

ngx_null_command

};

static ngx_http_module_t ngx_http_small_light_module_ctx = {

NULL, /* preconfiguration */

ngx_http_small_light_init, /* postconfiguration */

NULL, /* create main configuration */

NULL, /* init main configuration */

ngx_http_small_light_create_srv_conf, /* create server configuration */

ngx_http_small_light_merge_srv_conf, /* merge server configuration */

ngx_http_small_light_create_loc_conf, /* create location configuration */

ngx_http_small_light_merge_loc_conf /* merge location configuration */

};

ngx_module_t ngx_http_small_light_module = {

NGX_MODULE_V1,

&ngx_http_small_light_module_ctx, /* module context */

ngx_http_small_light_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_http_output_header_filter_pt ngx_http_next_header_filter;

static ngx_http_output_body_filter_pt ngx_http_next_body_filter;

static ngx_int_t ngx_http_small_light_header_filter(ngx_http_request_t *r)

{

ngx_http_small_light_conf_t *srv_conf;

ngx_http_small_light_conf_t *loc_conf;

ngx_http_small_light_ctx_t *ctx;

ngx_hash_init_t hash;

ngx_str_t define_pattern;

if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED) {

return ngx_http_next_header_filter(r);

}

srv_conf = ngx_http_get_module_srv_conf(r, ngx_http_small_light_module);

loc_conf = ngx_http_get_module_loc_conf(r, ngx_http_small_light_module);

if (!loc_conf->enable) {

return ngx_http_next_header_filter(r);

}

if(ngx_http_small_light_parse_define_pattern(r, &r->unparsed_uri, &define_pattern) != NGX_OK) {

ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "%s:%d", __FUNCTION__, __LINE__);

return ngx_http_next_header_filter(r);

}

ctx = ngx_http_get_module_ctx(r, ngx_http_small_light_module);

if (ctx) {

ngx_http_set_ctx(r, NULL, ngx_http_small_light_module);

return ngx_http_next_header_filter(r);

}

if ((ctx = ngx_pcalloc(r->pool, sizeof(*ctx))) == NULL) {

ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "%s:%d", __FUNCTION__, __LINE__);

return NGX_ERROR;

}

ngx_memzero(ctx, sizeof(ngx_http_small_light_ctx_t));

ctx->params.keys.pool = r->pool;

ctx->params.temp_pool = r->pool;

if (ngx_hash_keys_array_init(&ctx->params, NGX_HASH_SMALL) != NGX_OK) {

ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "%s:%d", __FUNCTION__, __LINE__);

return NGX_ERROR;

}

if (ngx_http_small_light_init_params(r, ctx, &define_pattern, srv_conf) != NGX_OK) {

ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "%s:%d", __FUNCTION__, __LINE__);

return NGX_ERROR;

}

hash.hash = &ctx->hash;

hash.key = ngx_hash_key_lc;

hash.max_size = 128;

hash.bucket_size = ngx_cacheline_size;

hash.name = "small_light_init_params";

hash.pool = ctx->params.keys.pool;

hash.temp_pool = NULL;

if (ngx_hash_init(&hash, ctx->params.keys.elts, ctx->params.keys.nelts) != NGX_OK) {

ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "%s:%d", __FUNCTION__, __LINE__);

return NGX_ERROR;

}

ctx->inf = r->headers_out.content_type.data;

ctx->content_length = r->headers_out.content_length_n;

ngx_http_set_ctx(r, ctx, ngx_http_small_light_module);

if (r->headers_out.refresh) {

r->headers_out.refresh->hash = 0;

}

r->main_filter_need_in_memory = 1;

r->allow_ranges = 0;

return NGX_OK;

}

static ngx_int_t ngx_http_small_light_body_filter(ngx_http_request_t *r, ngx_chain_t *in)

{

ngx_http_small_light_conf_t *srv_conf;

ngx_http_small_light_conf_t *loc_conf;

ngx_http_small_light_ctx_t *ctx;

ngx_chain_t out;

ngx_int_t rc;

if (in == NULL) {

return ngx_http_next_body_filter(r, in);

}

srv_conf = ngx_http_get_module_srv_conf(r, ngx_http_small_light_module);

loc_conf = ngx_http_get_module_loc_conf(r, ngx_http_small_light_module);

if (!loc_conf->enable) {

return ngx_http_next_body_filter(r, in);

}

ctx = ngx_http_get_module_ctx(r, ngx_http_small_light_module);

if (ctx == NULL) {

return ngx_http_next_body_filter(r, in);

}

if (ctx->ictx == NULL) {

ctx->ictx = ngx_pcalloc(r->pool, sizeof(ngx_http_small_light_imagemagick_ctx_t));

if (ctx->ictx == NULL) {

ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "%s:%d", __FUNCTION__, __LINE__);

return NGX_ERROR;

}

}

if((rc = ngx_http_small_light_image_read(r, in, ctx)) != NGX_OK) {

if (rc == NGX_AGAIN) {

return NGX_OK;

}

ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "%s:%d", __FUNCTION__, __LINE__);

return NGX_ERROR;

}

r->connection->buffered &= ~NGX_HTTP_SMALL_LIGHT_IMAGE_BUFFERED;

ngx_http_small_light_imagemagick_init(ctx);

rc = ngx_http_small_light_imagemagick_process(r, ctx);

ngx_http_small_light_imagemagick_term(ctx);

if (rc != NGX_OK) {

ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "%s:%d", __FUNCTION__, __LINE__);

return NGX_ERROR;

}

ngx_buf_t *b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));

if (b == NULL) {

ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "%s:%d", __FUNCTION__, __LINE__);

return NGX_ERROR;

}

b->pos = ctx->content;

b->last = ctx->content + ctx->content_length;

b->memory = 1;

b->last_buf = 1;

out.buf = b;

out.next = NULL;

r->headers_out.content_length_n = b->last - b->pos;

if (r->headers_out.content_length) {

r->headers_out.content_length->hash = 0;

}

r->headers_out.content_length = NULL;

ngx_pool_cleanup_t *cln;

cln = ngx_pool_cleanup_add(r->pool, 0);

if (cln == NULL) {

ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "%s:%d", __FUNCTION__, __LINE__);

return NGX_ERROR;

}

cln->handler = ngx_http_small_light_cleanup;

cln->data = ctx;

return ngx_http_small_light_finish(r, &out);

}

static void *ngx_http_small_light_create_srv_conf(ngx_conf_t *cf)

{

ngx_http_small_light_conf_t *srv_conf;

ngx_pool_t *pool, *temp_pool;

srv_conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_small_light_conf_t));

if (srv_conf == NULL) {

return NGX_CONF_ERROR;

}

pool = ngx_create_pool(16384, cf->log);

if (pool == NULL) {

return NGX_CONF_ERROR;

}

temp_pool = ngx_create_pool(16384, cf->log);

if (temp_pool == NULL) {

return NGX_CONF_ERROR;

}

srv_conf->patterns.keys.pool = pool;

srv_conf->patterns.temp_pool = temp_pool;

if (ngx_hash_keys_array_init(&srv_conf->patterns, NGX_HASH_SMALL) != NGX_OK) {

return NGX_CONF_ERROR;

}

return srv_conf;

}

static void *ngx_http_small_light_create_loc_conf(ngx_conf_t *cf)

{

ngx_http_small_light_conf_t *loc_conf;

loc_conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_small_light_conf_t));

if (loc_conf == NULL) {

return NGX_CONF_ERROR;

}

loc_conf->enable = NGX_CONF_UNSET;

return loc_conf;

}

static char *ngx_http_small_light_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)

{

ngx_http_small_light_conf_t *prev = parent;

ngx_http_small_light_conf_t *conf = child;

return NGX_CONF_OK;

}

static char *ngx_http_small_light_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)

{

ngx_http_small_light_conf_t *prev = parent;

ngx_http_small_light_conf_t *conf = child;

ngx_conf_merge_value(conf->enable, prev->enable, 0);

return NGX_CONF_OK;

}

static char *ngx_http_small_light_pattern_define(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)

{

ngx_http_small_light_conf_t *srv_conf;

ngx_uint_t key;

ngx_uint_t rc;

ngx_str_t *ptn_name;

ngx_str_t *ptn_str;

ngx_str_t *value;

srv_conf = conf;

value = cf->args->elts;

ptn_name = &value[1];

ptn_str = &value[2];

key = ngx_hash_key_lc(ptn_name->data, ptn_name->len);

rc = ngx_hash_add_key(&srv_conf->patterns, ptn_name, ptn_str->data, NGX_HASH_READONLY_KEY);

if (rc != NGX_OK) {

return NGX_CONF_ERROR;

}

ngx_hash_init_t hash;

hash.hash = &srv_conf->hash;

hash.key = ngx_hash_key_lc;

hash.max_size = 128;

hash.bucket_size = ngx_cacheline_size;

hash.name = "small_light_pattern_define";

hash.pool = srv_conf->patterns.keys.pool;

hash.temp_pool = NULL;

if (ngx_hash_init(&hash, srv_conf->patterns.keys.elts, srv_conf->patterns.keys.nelts) != NGX_OK) {

return NGX_CONF_ERROR;

}

return NGX_CONF_OK;

}

static ngx_int_t ngx_http_small_light_image_read(ngx_http_request_t *r, ngx_chain_t *in, ngx_http_small_light_ctx_t *ctx)

{

u_char *p;

size_t size, rest;

ngx_buf_t *b;

ngx_chain_t *cl;

if (ctx->content == NULL) {

ctx->content = ngx_pcalloc(r->pool, ctx->content_length);

if (ctx->content == NULL) {

return NGX_ERROR;

}

ctx->last = ctx->content;

}

p = ctx->last;

for (cl=in;cl!=NULL;cl=cl->next) {

b = cl->buf;

size = b->last - b->pos;

rest = ctx->content + ctx->content_length - p;

size = (rest < size) ? rest : size;

p = ngx_cpymem(p, b->pos, size);

b->pos += size;

if (b->last_buf) {

ctx->last = p;

return NGX_OK;

}

}

ctx->last = p;

r->connection->buffered |= NGX_HTTP_SMALL_LIGHT_IMAGE_BUFFERED;

return NGX_AGAIN;

}

static ngx_int_t ngx_http_small_light_finish(ngx_http_request_t *r, ngx_chain_t *out)

{

ngx_int_t rc;

rc = ngx_http_next_header_filter(r);

if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {

return NGX_ERROR;

}

return ngx_http_next_body_filter(r, out);

}

static ngx_int_t ngx_http_small_light_init(ngx_conf_t *cf)

{

ngx_http_next_header_filter = ngx_http_top_header_filter;

ngx_http_top_header_filter = ngx_http_small_light_header_filter;

ngx_http_next_body_filter = ngx_http_top_body_filter;

ngx_http_top_body_filter = ngx_http_small_light_body_filter;

return NGX_OK;

}