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ngx_http_diffstub_module.cpp
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/*
Copyright 2023 Comcast
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
Author: Erik Ponder, Jovan Rosario
*/
#include <iostream>
#include <sstream>
#include <string>
#include <regex>
#include <chrono>
#include "pugixml.hpp"
#ifdef __cplusplus
extern "C" {
#endif
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#define NGX_HTTP_DAV_OFF 2
#define NGX_HTTP_DAV_NO_DEPTH -3
#define NGX_HTTP_DAV_INVALID_DEPTH -2
#define NGX_HTTP_DAV_INFINITY_DEPTH -1
typedef struct {
ngx_uint_t methods;
ngx_uint_t access;
ngx_uint_t min_delete_depth;
ngx_flag_t create_full_put_path;
} ngx_http_diffstub_loc_conf_t;
typedef struct {
ngx_str_t path;
size_t len;
} ngx_http_diffstub_copy_ctx_t;
static ngx_int_t ngx_http_diffstub_handler(ngx_http_request_t *r);
static void ngx_http_diffstub_put_handler(ngx_http_request_t *r);
static ngx_int_t ngx_http_diffstub_delete_handler(ngx_http_request_t *r);
static ngx_int_t ngx_http_diffstub_delete_path(ngx_http_request_t *r,
ngx_str_t *path, ngx_uint_t dir);
static ngx_int_t ngx_http_diffstub_delete_dir(ngx_tree_ctx_t *ctx, ngx_str_t *path);
static ngx_int_t ngx_http_diffstub_delete_file(ngx_tree_ctx_t *ctx, ngx_str_t *path);
static ngx_int_t ngx_http_diffstub_noop(ngx_tree_ctx_t *ctx, ngx_str_t *path);
static ngx_int_t ngx_http_diffstub_mkcol_handler(ngx_http_request_t *r,
ngx_http_diffstub_loc_conf_t *dlcf);
static ngx_int_t ngx_http_diffstub_copy_move_handler(ngx_http_request_t *r);
static ngx_int_t ngx_http_diffstub_copy_dir(ngx_tree_ctx_t *ctx, ngx_str_t *path);
static ngx_int_t ngx_http_diffstub_copy_dir_time(ngx_tree_ctx_t *ctx,
ngx_str_t *path);
static ngx_int_t ngx_http_diffstub_copy_tree_file(ngx_tree_ctx_t *ctx,
ngx_str_t *path);
static ngx_int_t ngx_http_diffstub_depth(ngx_http_request_t *r, ngx_int_t dflt);
static ngx_int_t ngx_http_diffstub_error(ngx_log_t *log, ngx_err_t err,
ngx_int_t not_found, char *failed, u_char *path);
static ngx_int_t ngx_http_diffstub_location(ngx_http_request_t *r);
static void *ngx_http_diffstub_create_loc_conf(ngx_conf_t *cf);
static char *ngx_http_diffstub_merge_loc_conf(ngx_conf_t *cf,
void *parent, void *child);
static ngx_int_t ngx_http_diffstub_init(ngx_conf_t *cf);
static char *ngx_http_diffstub(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
const char* morph_diffs(const char* old_mpd, const char* new_mpd);
const char* extractPublishTime(const char* mpd);
const char* add_patch_location(const char* mpd, const char* mpd_id, const char* patch_location, const char* ttl);
static ngx_conf_bitmask_t ngx_http_diffstub_methods_mask[] = {
{ ngx_string("off"), NGX_HTTP_DAV_OFF },
{ ngx_string("put"), NGX_HTTP_PUT },
{ ngx_string("delete"), NGX_HTTP_DELETE },
{ ngx_string("mkcol"), NGX_HTTP_MKCOL },
{ ngx_string("copy"), NGX_HTTP_COPY },
{ ngx_string("move"), NGX_HTTP_MOVE },
{ ngx_null_string, 0 }
};
static ngx_command_t ngx_http_diffstub_commands[] = {
{ ngx_string("diffstub"), /* directive */
NGX_HTTP_LOC_CONF|NGX_CONF_NOARGS, /* location context and takes no arguments*/
ngx_http_diffstub, /* configuration setup function */
0, /* No offset. Only one context is supported. */
0, /* No offset when storing the module configuration on struct. */
NULL},
{ ngx_string("diff_dav_methods"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
ngx_conf_set_bitmask_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_diffstub_loc_conf_t, methods),
&ngx_http_diffstub_methods_mask },
{ ngx_string("diff_create_full_put_path"),
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_diffstub_loc_conf_t, create_full_put_path),
NULL },
{ ngx_string("diff_min_delete_depth"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_num_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_diffstub_loc_conf_t, min_delete_depth),
NULL },
{ ngx_string("diff_dav_access"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE123,
ngx_conf_set_access_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_diffstub_loc_conf_t, access),
NULL },
ngx_null_command
};
static ngx_http_module_t ngx_http_diffstub_module_ctx = {
NULL, /* preconfiguration */
ngx_http_diffstub_init, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
ngx_http_diffstub_create_loc_conf, /* create location configuration */
ngx_http_diffstub_merge_loc_conf /* merge location configuration */
};
ngx_module_t ngx_http_diffstub_module = {
NGX_MODULE_V1,
&ngx_http_diffstub_module_ctx, /* module context */
ngx_http_diffstub_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
};
/**
* Configuration setup function that installs the content handler.
*
* @param cf
* Module configuration structure pointer.
* @param cmd
* Module directives structure pointer.
* @param conf
* Module configuration structure pointer.
* @return string
* Status of the configuration setup.
*/
static char *ngx_http_diffstub(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_core_loc_conf_t *clcf; /* pointer to core location configuration */
/* Install the diffstub handler. */
clcf = (ngx_http_core_loc_conf_t*)ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);
clcf->handler = ngx_http_diffstub_handler;
return NGX_CONF_OK;
} /* ngx_http_diffstub */
static ngx_int_t
ngx_http_diffstub_handler(ngx_http_request_t *r)
{
ngx_int_t rc;
ngx_http_diffstub_loc_conf_t *dlcf;
dlcf = (ngx_http_diffstub_loc_conf_t*)ngx_http_get_module_loc_conf(r, ngx_http_diffstub_module);
if (!(r->method & dlcf->methods)) {
return NGX_DECLINED;
}
switch (r->method) {
case NGX_HTTP_PUT:
if (r->uri.data[r->uri.len - 1] == '/') {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"cannot PUT to a collection");
return NGX_HTTP_CONFLICT;
}
if (r->headers_in.content_range) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"PUT with range is unsupported");
return NGX_HTTP_NOT_IMPLEMENTED;
}
r->request_body_in_file_only = 1;
r->request_body_in_persistent_file = 1;
r->request_body_in_clean_file = 1;
r->request_body_file_group_access = 1;
r->request_body_file_log_level = 0;
rc = ngx_http_read_client_request_body(r, ngx_http_diffstub_put_handler);
if (rc >= NGX_HTTP_SPECIAL_RESPONSE) {
return rc;
}
return NGX_DONE;
case NGX_HTTP_DELETE:
return ngx_http_diffstub_delete_handler(r);
case NGX_HTTP_MKCOL:
return ngx_http_diffstub_mkcol_handler(r, dlcf);
case NGX_HTTP_COPY:
return ngx_http_diffstub_copy_move_handler(r);
case NGX_HTTP_MOVE:
return ngx_http_diffstub_copy_move_handler(r);
}
return NGX_DECLINED;
}
static void diffstub_save_file(char* stringToSave, char* filePath, ngx_http_request_t *r){
FILE *file = fopen(filePath, "w");
if(file == NULL){
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"diffstub temp filename: \"%s\" could not be opened", filePath);
}
size_t dataSize = strlen(stringToSave);
size_t elementsWritten = fwrite(stringToSave, sizeof(char), dataSize, file);
// Confirm data was written successfully
if (elementsWritten != dataSize) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"diffstub temp filename: \"%s\" could not be written", filePath);
}
// Free memory
fclose(file);
}
static void
ngx_http_diffstub_put_handler(ngx_http_request_t *r)
{
size_t root;
time_t date;
ngx_str_t *temp, path;
ngx_uint_t status;
ngx_file_info_t fi;
ngx_ext_rename_file_t ext;
ngx_http_diffstub_loc_conf_t *dlcf;
if (r->request_body == NULL) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"PUT request body is unavailable");
ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
if (r->request_body->temp_file == NULL) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"PUT request body must be in a file");
ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
if (ngx_http_map_uri_to_path(r, &path, &root, 0) == NULL) {
ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
path.len--;
temp = &r->request_body->temp_file->file.name;
////
// Generate and save patch.mpd
////
// Initialize constants
const char *manifestNoPatchLocationFilePath = "/dev/shm/dash/Service2/manifestNoPL.mpd";
const char *manifestFilePath = "/dev/shm/dash/Service2/manifest.mpd";
char *patchFilePath = "/dev/shm/dash/Service2/live-stream/patch.mpd-";
char *patchLocationPath = "/dash/Service2/live-stream/patch.mpd-";
// Calculate length of strings
int patchFilePathLength = strlen(patchFilePath);
int patchLocationPathLength = strlen(patchLocationPath);
ngx_log_debug(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"before morph_diffs");
// Save manifest with no patch location for demo purposes
FILE *sourceFile, *destinationFile;
char content[100];
// Open the source file for reading
sourceFile = fopen((char*)temp->data, "r");
if (sourceFile == NULL) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"diffstub temp filename: \"%s\" could not be opened", (char*)temp->data);
return;
}
// Open the destination file for writing
destinationFile = fopen(manifestNoPatchLocationFilePath, "w");
if (destinationFile == NULL) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"diffstub temp filename: \"%s\" could not be written", manifestNoPatchLocationFilePath);
return;
}
// Read content from the source file and write it to the destination file
while (fgets(content, sizeof(content), sourceFile) != NULL) {
fputs(content, destinationFile);
}
// Close the files
fclose(sourceFile);
fclose(destinationFile);
// Check if the manifest is there first
FILE *old_mpd_file = fopen(manifestFilePath, "r");
if(old_mpd_file != NULL){
fclose(old_mpd_file);
////
// Add patch location to incoming manifest.mpd
// Using existing mpd's publishTime
////
ngx_log_debug(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"before add_patch_location: \"%s\"", temp->data);
// Extract publishTime from existing mpd
const char *originalPublishTime = extractPublishTime(manifestFilePath);
const char *incomingPublishTime = extractPublishTime((const char*)temp->data);
int originalPublishTimeLength = strlen(originalPublishTime);
int incomingPublishTimeLength = strlen(incomingPublishTime);
// Allocate memory for the concatenated string
char *resultingPatchFilePath = (char*)malloc(patchFilePathLength + originalPublishTimeLength + 1);
strcpy(resultingPatchFilePath,patchFilePath);
strcpy(resultingPatchFilePath+patchFilePathLength,originalPublishTime);
// Allocate memory for the concatenated string
char *resultingPatchLocationPath = (char*)malloc(patchLocationPathLength + incomingPublishTimeLength + 1);
strcpy(resultingPatchLocationPath,patchLocationPath);
strcpy(resultingPatchLocationPath+patchLocationPathLength,incomingPublishTime);
const char* mpd_with_patch_location = add_patch_location((const char*)temp->data, "?", resultingPatchLocationPath, "6.7");
// Save right back to (const char*)temp->data
diffstub_save_file((char*)mpd_with_patch_location, (char*)temp->data, r);
free((void*) mpd_with_patch_location);
free(resultingPatchLocationPath);
const char* mpd_patch = morph_diffs(manifestFilePath,(const char*)temp->data);
// Save to live-stream/patch.mpd
diffstub_save_file((char*)mpd_patch, resultingPatchFilePath, r);
free((void*) mpd_patch);
free(resultingPatchFilePath);
}
else{
ngx_log_error(NGX_LOG_WARN, r->connection->log, 0,
"diffstub manifest.mpd not found, skipping morph_diffs");
////
// Add patch location to incoming manifest.mpd
////
ngx_log_debug(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"before add_patch_location: \"%s\"", temp->data);
// Extract publishTime from existing mpd
const char *incomingPublishTime = extractPublishTime((const char*)temp->data);
int incomingPublishTimeLength = strlen(incomingPublishTime);
// Allocate memory for the concatenated string
char *resultingPatchLocationPath = (char*)malloc(patchLocationPathLength + incomingPublishTimeLength + 1);
strcpy(resultingPatchLocationPath,patchLocationPath);
strcpy(resultingPatchLocationPath+patchLocationPathLength,incomingPublishTime);
const char* mpd_with_patch_location = add_patch_location((const char*)temp->data, "?", resultingPatchLocationPath, "6.7");
// Save right back to (const char*)temp->data
diffstub_save_file((char*)mpd_with_patch_location, (char*)temp->data, r);
free((void*) mpd_with_patch_location);
free(resultingPatchLocationPath);
}
ngx_log_debug(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"After Overall Process..");
if (ngx_file_info(path.data, &fi) == NGX_FILE_ERROR) {
status = NGX_HTTP_CREATED;
} else {
status = NGX_HTTP_NO_CONTENT;
if (ngx_is_dir(&fi)) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, NGX_EISDIR,
"\"%s\" could not be created", path.data);
if (ngx_delete_file(temp->data) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
ngx_delete_file_n, " \"%s\" failed",
temp->data);
}
ngx_http_finalize_request(r, NGX_HTTP_CONFLICT);
return;
}
}
dlcf = (ngx_http_diffstub_loc_conf_t*)ngx_http_get_module_loc_conf(r, ngx_http_diffstub_module);
ext.access = dlcf->access;
ext.path_access = dlcf->access;
ext.time = -1;
ext.create_path = dlcf->create_full_put_path;
ext.delete_file = 1;
ext.log = r->connection->log;
if (r->headers_in.date) {
date = ngx_parse_http_time(r->headers_in.date->value.data,
r->headers_in.date->value.len);
if (date != NGX_ERROR) {
ext.time = date;
ext.fd = r->request_body->temp_file->file.fd;
}
}
if (ngx_ext_rename_file(temp, &path, &ext) != NGX_OK) {
ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
if (status == NGX_HTTP_CREATED) {
if (ngx_http_diffstub_location(r) != NGX_OK) {
ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
r->headers_out.content_length_n = 0;
}
r->headers_out.status = status;
r->header_only = 1;
ngx_http_finalize_request(r, ngx_http_send_header(r));
return;
}
static ngx_int_t
ngx_http_diffstub_delete_handler(ngx_http_request_t *r)
{
size_t root;
ngx_err_t err;
ngx_int_t rc, depth;
ngx_uint_t i, d, dir;
ngx_str_t path;
ngx_file_info_t fi;
ngx_http_diffstub_loc_conf_t *dlcf;
if (r->headers_in.content_length_n > 0 || r->headers_in.chunked) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"DELETE with body is unsupported");
return NGX_HTTP_UNSUPPORTED_MEDIA_TYPE;
}
dlcf = (ngx_http_diffstub_loc_conf_t*)ngx_http_get_module_loc_conf(r, ngx_http_diffstub_module);
if (dlcf->min_delete_depth) {
d = 0;
for (i = 0; i < r->uri.len; /* void */) {
if (r->uri.data[i++] == '/') {
if (++d >= dlcf->min_delete_depth && i < r->uri.len) {
goto ok;
}
}
}
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"insufficient URI depth:%i to DELETE", d);
return NGX_HTTP_CONFLICT;
}
ok:
if (ngx_http_map_uri_to_path(r, &path, &root, 0) == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http delete filename: \"%s\"", path.data);
if (ngx_link_info(path.data, &fi) == NGX_FILE_ERROR) {
err = ngx_errno;
rc = (err == NGX_ENOTDIR) ? NGX_HTTP_CONFLICT : NGX_HTTP_NOT_FOUND;
return ngx_http_diffstub_error(r->connection->log, err,
rc, ngx_link_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, NGX_EISDIR,
"DELETE \"%s\" failed", path.data);
return NGX_HTTP_CONFLICT;
}
depth = ngx_http_diffstub_depth(r, NGX_HTTP_DAV_INFINITY_DEPTH);
if (depth != NGX_HTTP_DAV_INFINITY_DEPTH) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"\"Depth\" header must be infinity");
return NGX_HTTP_BAD_REQUEST;
}
path.len -= 2; /* omit "/\0" */
dir = 1;
} else {
/*
* we do not need to test (r->uri.data[r->uri.len - 1] == '/')
* because ngx_link_info("/file/") returned NGX_ENOTDIR above
*/
depth = ngx_http_diffstub_depth(r, 0);
if (depth != 0 && depth != NGX_HTTP_DAV_INFINITY_DEPTH) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"\"Depth\" header must be 0 or infinity");
return NGX_HTTP_BAD_REQUEST;
}
dir = 0;
}
rc = ngx_http_diffstub_delete_path(r, &path, dir);
if (rc == NGX_OK) {
return NGX_HTTP_NO_CONTENT;
}
return rc;
}
static ngx_int_t
ngx_http_diffstub_delete_path(ngx_http_request_t *r, ngx_str_t *path, ngx_uint_t dir)
{
char *failed;
ngx_tree_ctx_t tree;
if (dir) {
tree.init_handler = NULL;
tree.file_handler = ngx_http_diffstub_delete_file;
tree.pre_tree_handler = ngx_http_diffstub_noop;
tree.post_tree_handler = ngx_http_diffstub_delete_dir;
tree.spec_handler = ngx_http_diffstub_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_diffstub_error(r->connection->log, ngx_errno,
NGX_HTTP_NOT_FOUND, failed, path->data);
}
static ngx_int_t
ngx_http_diffstub_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_diffstub_error(ctx->log, ngx_errno, 0, ngx_delete_dir_n,
path->data);
}
return NGX_OK;
}
static ngx_int_t
ngx_http_diffstub_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_diffstub_error(ctx->log, ngx_errno, 0, ngx_delete_file_n,
path->data);
}
return NGX_OK;
}
static ngx_int_t
ngx_http_diffstub_noop(ngx_tree_ctx_t *ctx, ngx_str_t *path)
{
return NGX_OK;
}
static ngx_int_t
ngx_http_diffstub_mkcol_handler(ngx_http_request_t *r, ngx_http_diffstub_loc_conf_t *dlcf)
{
u_char *p;
size_t root;
ngx_str_t path;
if (r->headers_in.content_length_n > 0 || r->headers_in.chunked) {
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);
if (p == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
*(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_diffstub_location(r) != NGX_OK) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
return NGX_HTTP_CREATED;
}
return ngx_http_diffstub_error(r->connection->log, ngx_errno,
NGX_HTTP_CONFLICT, ngx_create_dir_n, path.data);
}
static ngx_int_t
ngx_http_diffstub_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, flags;
ngx_str_t path, uri, duri, args;
ngx_tree_ctx_t tree;
ngx_copy_file_t cf;
ngx_file_info_t fi;
ngx_table_elt_t *dest, *over;
ngx_ext_rename_file_t ext;
ngx_http_diffstub_copy_ctx_t copy;
ngx_http_diffstub_loc_conf_t *dlcf;
if (r->headers_in.content_length_n > 0 || r->headers_in.chunked) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"COPY and MOVE with body are unsupported");
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;
}
p = dest->value.data;
/* there is always '\0' even after empty header value */
if (p[0] == '/') {
last = p + dest->value.len;
goto destination_done;
}
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:
duri.len = last - p;
duri.data = p;
flags = NGX_HTTP_LOG_UNSAFE;
if (ngx_http_parse_unsafe_uri(r, &duri, &args, &flags) != NGX_OK) {
goto invalid_destination;
}
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_diffstub_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:
if (ngx_http_map_uri_to_path(r, &path, &root, 0) == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http copy from: \"%s\"", path.data);
uri = r->uri;
r->uri = duri;
if (ngx_http_map_uri_to_path(r, ©.path, &root, 0) == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
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_link_info(copy.path.data, &fi) == NGX_FILE_ERROR) {
err = ngx_errno;
if (err != NGX_ENOENT) {
return ngx_http_diffstub_error(r->connection->log, err,
NGX_HTTP_NOT_FOUND, ngx_link_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_link_info(path.data, &fi) == NGX_FILE_ERROR) {
return ngx_http_diffstub_error(r->connection->log, ngx_errno,
NGX_HTTP_NOT_FOUND, ngx_link_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_diffstub_delete_path(r, ©.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_diffstub_error(r->connection->log, ngx_errno,
NGX_HTTP_NOT_FOUND,
ngx_create_dir_n, copy.path.data);
}
copy.len = path.len;