static ngx_buf_t *
ngx_http_image_process(ngx_http_request_t *r)
{
ngx_buf_t *b;
ngx_int_t rc;
ngx_http_image_filter_ctx_t *ctx;
ngx_http_image_filter_conf_t *conf;
r->connection->buffered &= ~NGX_HTTP_IMAGE_BUFFERED;
ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module);
rc = ngx_http_image_size(r, ctx);
conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module);
if (conf->filter == NGX_HTTP_IMAGE_SIZE) {
b = ngx_http_image_json(r, rc == NGX_OK ? ctx : NULL);
} else if (rc == NGX_OK
&& ctx->width <= conf->width
&& ctx->height <= conf->height)
{
b = ngx_http_image_asis(r, ctx);
} else {
b = ngx_http_image_resize(r, ctx);
}
return b;
}
static ngx_buf_t *
ngx_http_image_process(ngx_http_request_t *r)
{
ngx_int_t rc;
ngx_http_image_filter_ctx_t *ctx;
ngx_http_image_filter_conf_t *conf;
r->connection->buffered &= ~NGX_HTTP_IMAGE_BUFFERED;
ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module);
rc = ngx_http_image_size(r, ctx);
conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module);
if (conf->filter == NGX_HTTP_IMAGE_SIZE) {
return ngx_http_image_json(r, rc == NGX_OK ? ctx : NULL);
}
ctx->angle = ngx_http_image_filter_get_value(r, conf->acv, conf->angle);
if (conf->filter == NGX_HTTP_IMAGE_ROTATE) {
if (ctx->angle != 90 && ctx->angle != 180 && ctx->angle != 270) {
return NULL;
}
return ngx_http_image_resize(r, ctx);
}
ctx->max_width = ngx_http_image_filter_get_value(r, conf->wcv, conf->width);
if (ctx->max_width == 0) {
return NULL;
}
ctx->max_height = ngx_http_image_filter_get_value(r, conf->hcv,
conf->height);
if (ctx->max_height == 0) {
return NULL;
}
if (rc == NGX_OK
&& ctx->width <= ctx->max_width
&& ctx->height <= ctx->max_height
&& ctx->angle == 0
&& !ctx->force)
{
return ngx_http_image_asis(r, ctx);
}
return ngx_http_image_resize(r, ctx);
}
static ngx_int_t
ngx_http_image_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
{
ngx_int_t rc;
ngx_str_t *ct;
ngx_chain_t out;
ngx_http_image_filter_ctx_t *ctx;
ngx_http_image_filter_conf_t *conf;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "image filter");
if (in == NULL) {
return ngx_http_next_body_filter(r, in);
}
ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module);
if (ctx == NULL) {
return ngx_http_next_body_filter(r, in);
}
switch (ctx->phase) {
case NGX_HTTP_IMAGE_START:
ctx->type = ngx_http_image_test(r, in);
conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module);
if (ctx->type == NGX_HTTP_IMAGE_NONE) {
if (conf->filter == NGX_HTTP_IMAGE_SIZE) {
out.buf = ngx_http_image_json(r, NULL);
if (out.buf) {
out.next = NULL;
ctx->phase = NGX_HTTP_IMAGE_DONE;
return ngx_http_image_send(r, ctx, &out);
}
}
return ngx_http_filter_finalize_request(r,
&ngx_http_image_filter_module,
NGX_HTTP_UNSUPPORTED_MEDIA_TYPE);
}
/* override content type */
ct = &ngx_http_image_types[ctx->type - 1];
r->headers_out.content_type_len = ct->len;
r->headers_out.content_type = *ct;
r->headers_out.content_type_lowcase = NULL;
if (conf->filter == NGX_HTTP_IMAGE_TEST) {
ctx->phase = NGX_HTTP_IMAGE_PASS;
return ngx_http_image_send(r, ctx, in);
}
ctx->phase = NGX_HTTP_IMAGE_READ;
/* fall through */
case NGX_HTTP_IMAGE_READ:
rc = ngx_http_image_read(r, in);
if (rc == NGX_AGAIN) {
return NGX_OK;
}
if (rc == NGX_ERROR) {
return ngx_http_filter_finalize_request(r,
&ngx_http_image_filter_module,
NGX_HTTP_UNSUPPORTED_MEDIA_TYPE);
}
/* fall through */
case NGX_HTTP_IMAGE_PROCESS:
out.buf = ngx_http_image_process(r);
if (out.buf == NULL) {
return ngx_http_filter_finalize_request(r,
&ngx_http_image_filter_module,
NGX_HTTP_UNSUPPORTED_MEDIA_TYPE);
}
out.next = NULL;
ctx->phase = NGX_HTTP_IMAGE_PASS;
return ngx_http_image_send(r, ctx, &out);
case NGX_HTTP_IMAGE_PASS:
return ngx_http_next_body_filter(r, in);
default: /* NGX_HTTP_IMAGE_DONE */
rc = ngx_http_next_body_filter(r, NULL);
/* NGX_ERROR resets any pending data */
return (rc == NGX_OK) ? NGX_ERROR : rc;
}
}
