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; } }