src/http/modules/ngx_http_static_handler.c

#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#include <ngx_http_config.h>
#include <ngx_http_core_module.h>
#include <ngx_http_output_filter.h>



int ngx_http_static_handler(ngx_http_request_t *r)
{
    int                        rc, key, i;
    ngx_log_e                  level;
    ngx_err_t                  err;
    ngx_hunk_t                *h;
    ngx_http_type_t           *type;
    ngx_http_log_ctx_t        *ctx;
    ngx_http_core_loc_conf_t  *clcf;

    rc = ngx_http_discard_body(r);

    if (rc != NGX_OK) {
        return rc;
    }

    if (r->method != NGX_HTTP_GET && r->method != NGX_HTTP_HEAD) {
        return NGX_HTTP_NOT_ALLOWED;
    }

    ctx = r->connection->log->data;
    ctx->action = "sending response";

    if (r->file.fd == NGX_INVALID_FILE) {
        r->file.fd = ngx_open_file(r->file.name.data, NGX_FILE_RDONLY);

        if (r->file.fd == NGX_INVALID_FILE) {
            err = ngx_errno;

            if (err == NGX_ENOENT || err == NGX_ENOTDIR) {
                level = NGX_LOG_ERR;
                rc = NGX_HTTP_NOT_FOUND;

            } else {
                level = NGX_LOG_CRIT;
                rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
            }

            ngx_log_error(level, r->connection->log, ngx_errno,
                          ngx_open_file_n " %s failed", r->file.name.data);
            return rc;
        }
    }

    if (!r->file.info_valid) {
        if (ngx_stat_fd(r->file.fd, &r->file.info) == NGX_FILE_ERROR) {
            ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
                          ngx_stat_fd_n " %s failed", r->file.name.data);

            if (ngx_close_file(r->file.fd) == NGX_FILE_ERROR)
                ngx_log_error(NGX_LOG_ALERT, r->connection->log, ngx_errno,
                              ngx_close_file_n " %s failed", r->file.name.data);

            return NGX_HTTP_INTERNAL_SERVER_ERROR;
        }

        r->file.info_valid = 1;
    }

#if !(WIN32) /* the not regular files are probably Unix specific */

    if (!ngx_is_file(r->file.info)) {
        ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
                      "%s is not regular file", r->file.name.data);

        if (ngx_close_file(r->file.fd) == NGX_FILE_ERROR)
            ngx_log_error(NGX_LOG_ALERT, r->connection->log, ngx_errno,
                          ngx_close_file_n " %s failed", r->file.name.data);

        return NGX_HTTP_NOT_FOUND;
    }

#endif

    r->headers_out.status = NGX_HTTP_OK;
    r->headers_out.content_length = ngx_file_size(r->file.info);
    r->headers_out.last_modified_time = ngx_file_mtime(r->file.info);

    ngx_test_null(r->headers_out.content_type,
                  ngx_push_table(r->headers_out.headers),
                  NGX_HTTP_INTERNAL_SERVER_ERROR);

    r->headers_out.content_type->key.len = 0;
    r->headers_out.content_type->key.data = NULL;
    r->headers_out.content_type->value.len = 0;
    r->headers_out.content_type->value.data = NULL;

    clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);

    if (r->exten.len) {
        ngx_http_types_hash_key(key, r->exten);

        type = (ngx_http_type_t *) clcf->types[key].elts;
        for (i = 0; i < clcf->types[key].nelts; i++) {
            if (r->exten.len != type[i].exten.len) {
                continue;
            }

            if (ngx_strcasecmp(r->exten.data, type[i].exten.data) == 0) {
                r->headers_out.content_type->value.len = type[i].type.len;
                r->headers_out.content_type->value.data = type[i].type.data;

                break;
            }
        }
    }

    if (r->headers_out.content_type->value.len == 0) {
        r->headers_out.content_type->value.len = clcf->default_type.len;
        r->headers_out.content_type->value.data = clcf->default_type.data;
    }

    /* we need to allocate all before the header would be sent */
    ngx_test_null(h, ngx_pcalloc(r->pool, sizeof(ngx_hunk_t)),
                  NGX_HTTP_INTERNAL_SERVER_ERROR);

    ngx_test_null(h->file, ngx_pcalloc(r->pool, sizeof(ngx_file_t)),
                  NGX_HTTP_INTERNAL_SERVER_ERROR);


    rc = ngx_http_send_header(r);

    if (r->header_only) {
        if (rc == NGX_AGAIN) {
            ngx_http_set_write_handler(r);

        } else {
            ngx_http_finalize_request(r, 0);
        }

        return NGX_OK;
    }


    h->type = NGX_HUNK_FILE|NGX_HUNK_LAST;
    h->file_pos = 0;
    h->file_last = ngx_file_size(r->file.info);

    h->file->fd = r->file.fd;
    h->file->log = r->connection->log;

    rc = ngx_http_output_filter(r, h);

    if (r->main == NULL) {
        if (rc == NGX_AGAIN) {
            ngx_http_set_write_handler(r);

        } else {
            ngx_http_finalize_request(r, 0);
        }
    }

    return NGX_OK;
}