ngx_http_dav_module.c

nginx 反向代理0.7.1版本 用于实现反向代理

        tree.spec_handler = ngx_http_dav_delete_file;
        tree.data = NULL;
        tree.alloc = 0;
        tree.log = r->connection->log;

        /* TODO: 207 */

        if (ngx_walk_tree(&tree, path) != NGX_OK) {
            return NGX_HTTP_INTERNAL_SERVER_ERROR;
        }

        if (ngx_delete_dir(path->data) != NGX_FILE_ERROR) {
            return NGX_OK;
        }

        failed = ngx_delete_dir_n;

    } else {

        if (ngx_delete_file(path->data) != NGX_FILE_ERROR) {
            return NGX_OK;
        }

        failed = ngx_delete_file_n;
    }

    return ngx_http_dav_error(r->connection->log, ngx_errno,
                              NGX_HTTP_NOT_FOUND, failed, path->data);
}


static ngx_int_t
ngx_http_dav_delete_dir(ngx_tree_ctx_t *ctx, ngx_str_t *path)
{
    ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ctx->log, 0,
                   "http delete dir: \"%s\"", path->data);

    if (ngx_delete_dir(path->data) == NGX_FILE_ERROR) {

        /* TODO: add to 207 */

        (void) ngx_http_dav_error(ctx->log, ngx_errno, 0, ngx_delete_dir_n,
                                  path->data);
    }

    return NGX_OK;
}


static ngx_int_t
ngx_http_dav_delete_file(ngx_tree_ctx_t *ctx, ngx_str_t *path)
{
    ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ctx->log, 0,
                   "http delete file: \"%s\"", path->data);

    if (ngx_delete_file(path->data) == NGX_FILE_ERROR) {

        /* TODO: add to 207 */

        (void) ngx_http_dav_error(ctx->log, ngx_errno, 0, ngx_delete_file_n,
                                  path->data);
    }

    return NGX_OK;
}


static ngx_int_t
ngx_http_dav_noop(ngx_tree_ctx_t *ctx, ngx_str_t *path)
{
    return NGX_OK;
}


static ngx_int_t
ngx_http_dav_mkcol_handler(ngx_http_request_t *r, ngx_http_dav_loc_conf_t *dlcf)
{
    u_char    *p;
    size_t     root;
    ngx_str_t  path;

    if (r->headers_in.content_length_n > 0) {
        ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                      "MKCOL with body is unsupported");
        return NGX_HTTP_UNSUPPORTED_MEDIA_TYPE;
    }

    if (r->uri.data[r->uri.len - 1] != '/') {
        ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                      "MKCOL can create a collection only");
        return NGX_HTTP_CONFLICT;
    }

    p = ngx_http_map_uri_to_path(r, &path, &root, 0);

    *(p - 1) = '\0';

    ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                   "http mkcol path: \"%s\"", path.data);

    if (ngx_create_dir(path.data, ngx_dir_access(dlcf->access))
        != NGX_FILE_ERROR)
    {
        if (ngx_http_dav_location(r, path.data) != NGX_OK) {
            return NGX_HTTP_INTERNAL_SERVER_ERROR;
        }

        return NGX_HTTP_CREATED;
    }

    return ngx_http_dav_error(r->connection->log, ngx_errno,
                              NGX_HTTP_CONFLICT, ngx_create_dir_n, path.data);
}


static ngx_int_t
ngx_http_dav_copy_move_handler(ngx_http_request_t *r)
{
    u_char                   *p, *host, *last, ch;
    size_t                    len, root;
    ngx_err_t                 err;
    ngx_int_t                 rc, depth;
    ngx_uint_t                overwrite, slash, dir;
    ngx_str_t                 path, uri;
    ngx_tree_ctx_t            tree;
    ngx_file_info_t           fi;
    ngx_table_elt_t          *dest, *over;
    ngx_http_dav_copy_ctx_t   copy;
    ngx_http_dav_loc_conf_t  *dlcf;

    if (r->headers_in.content_length_n > 0) {
        return NGX_HTTP_UNSUPPORTED_MEDIA_TYPE;
    }

    dest = r->headers_in.destination;

    if (dest == NULL) {
        ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                      "client sent no \"Destination\" header");
        return NGX_HTTP_BAD_REQUEST;
    }

    len = r->headers_in.server.len;

    if (len == 0) {
        ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                      "client sent no \"Host\" header");
        return NGX_HTTP_BAD_REQUEST;
    }

#if (NGX_HTTP_SSL)

    if (r->connection->ssl) {
        if (ngx_strncmp(dest->value.data, "https://", sizeof("https://") - 1)
            != 0)
        {
            goto invalid_destination;
        }

        host = dest->value.data + sizeof("https://") - 1;

    } else
#endif
    {
        if (ngx_strncmp(dest->value.data, "http://", sizeof("http://") - 1)
            != 0)
        {
            goto invalid_destination;
        }

        host = dest->value.data + sizeof("http://") - 1;
    }

    if (ngx_strncmp(host, r->headers_in.server.data, len) != 0) {
        ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                      "\"Destination\" URI \"%V\" is handled by "
                      "different repository than the source URI",
                      &dest->value);
        return NGX_HTTP_BAD_REQUEST;
    }

    last = dest->value.data + dest->value.len;

    for (p = host + len; p < last; p++) {
        if (*p == '/') {
            goto destination_done;
        }
    }

invalid_destination:

    ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                  "client sent invalid \"Destination\" header: \"%V\"",
                  &dest->value);
    return NGX_HTTP_BAD_REQUEST;

destination_done:

    if ((r->uri.data[r->uri.len - 1] == '/' && *(last - 1) != '/')
        || (r->uri.data[r->uri.len - 1] != '/' && *(last - 1) == '/'))
    {
         ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                       "both URI \"%V\" and \"Destination\" URI \"%V\" "
                       "should be either collections or non-collections",
                       &r->uri, &dest->value);
         return NGX_HTTP_CONFLICT;
    }

    depth = ngx_http_dav_depth(r, NGX_HTTP_DAV_INFINITY_DEPTH);

    if (depth != NGX_HTTP_DAV_INFINITY_DEPTH) {

        if (r->method == NGX_HTTP_COPY) {
            if (depth != 0) {
                ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                              "\"Depth\" header must be 0 or infinity");
                return NGX_HTTP_BAD_REQUEST;
            }

        } else {
            ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                          "\"Depth\" header must be infinity");
            return NGX_HTTP_BAD_REQUEST;
        }
    }

    over = r->headers_in.overwrite;

    if (over) {
        if (over->value.len == 1) {
            ch = over->value.data[0];

            if (ch == 'T' || ch == 't') {
                overwrite = 1;
                goto overwrite_done;
            }

            if (ch == 'F' || ch == 'f') {
                overwrite = 0;
                goto overwrite_done;
            }

        }

        ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                      "client sent invalid \"Overwrite\" header: \"%V\"",
                      &over->value);
        return NGX_HTTP_BAD_REQUEST;
    }

    overwrite = 1;

overwrite_done:

    ngx_http_map_uri_to_path(r, &path, &root, 0);

    ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                   "http copy from: \"%s\"", path.data);

    uri = r->uri;

    r->uri.len = last - p;
    r->uri.data = p;

    ngx_http_map_uri_to_path(r, &copy.path, &root, 0);

    r->uri = uri;

    copy.path.len--;  /* omit "\0" */

    if (copy.path.data[copy.path.len - 1] == '/') {
        slash = 1;
        copy.path.len--;
        copy.path.data[copy.path.len] = '\0';

    } else {
        slash = 0;
    }

    ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                   "http copy to: \"%s\"", copy.path.data);

    if (ngx_file_info(copy.path.data, &fi) == -1) {
        err = ngx_errno;

        if (err != NGX_ENOENT) {
            return ngx_http_dav_error(r->connection->log, err,
                                      NGX_HTTP_NOT_FOUND, ngx_file_info_n,
                                      copy.path.data);
        }

        /* destination does not exist */

        overwrite = 0;
        dir = 0;

    } else {

        /* destination exists */

        if (ngx_is_dir(&fi) && !slash) {
            ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                          "\"%V\" could not be %Ved to collection \"%V\"",
                          &r->uri, &r->method_name, &dest->value);
            return NGX_HTTP_CONFLICT;
        }

        if (!overwrite) {
            ngx_log_error(NGX_LOG_ERR, r->connection->log, NGX_EEXIST,
                          "\"%s\" could not be created", copy.path.data);
            return NGX_HTTP_PRECONDITION_FAILED;
        }

        dir = ngx_is_dir(&fi);
    }

    if (ngx_file_info(path.data, &fi) == -1) {
        return ngx_http_dav_error(r->connection->log, ngx_errno,
                                  NGX_HTTP_NOT_FOUND, ngx_file_info_n,
                                  path.data);
    }

    if (ngx_is_dir(&fi)) {

        if (r->uri.data[r->uri.len - 1] != '/') {
            ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                          "\"%V\" is collection", &r->uri);
            return NGX_HTTP_BAD_REQUEST;
        }

        if (overwrite) {
            ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                           "http delete: \"%s\"", copy.path.data);

            rc = ngx_http_dav_delete_path(r, &copy.path, dir);

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

    if (ngx_is_dir(&fi)) {

        path.len -= 2;  /* omit "/\0" */

        if (r->method == NGX_HTTP_MOVE) {
            if (ngx_rename_file(path.data, copy.path.data) != NGX_FILE_ERROR) {
                return NGX_HTTP_CREATED;
            }
        }

        if (ngx_create_dir(copy.path.data, ngx_file_access(&fi))
            == NGX_FILE_ERROR)
        {
            return ngx_http_dav_error(r->connection->log, ngx_errno,
                                      NGX_HTTP_NOT_FOUND,
                                      ngx_create_dir_n, copy.path.data);
        }

        copy.len = path.len;

        tree.init_handler = NULL;
        tree.file_handler = ngx_http_dav_copy_tree_file;
        tree.pre_tree_handler = ngx_http_dav_copy_dir;
        tree.post_tree_handler = ngx_http_dav_copy_dir_time;
        tree.spec_handler = ngx_http_dav_noop;
        tree.data = &copy;
        tree.alloc = 0;
        tree.log = r->connection->log;

        if (ngx_walk_tree(&tree, &path) == NGX_OK) {

            if (r->method == NGX_HTTP_MOVE) {
                rc = ngx_http_dav_delete_path(r, &path, 1);

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

            return NGX_HTTP_CREATED;
        }

    } else {

        if (r->method == NGX_HTTP_MOVE) {
            if (ngx_rename_file(path.data, copy.path.data) != NGX_FILE_ERROR) {
                return NGX_HTTP_NO_CONTENT;
            }
        }

        dlcf = ngx_http_get_module_loc_conf(r, ngx_http_dav_module);

        tree.size = ngx_file_size(&fi);
        tree.mtime = ngx_file_mtime(&fi);