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ngx_http_vod_utils.c
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ngx_http_vod_utils.c
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#include "ngx_http_vod_utils.h"
static const ngx_int_t error_map[VOD_ERROR_LAST - VOD_ERROR_FIRST] = {
NGX_HTTP_NOT_FOUND, // VOD_BAD_DATA
NGX_HTTP_INTERNAL_SERVER_ERROR, // VOD_ALLOC_FAILED
NGX_HTTP_INTERNAL_SERVER_ERROR, // VOD_UNEXPECTED
NGX_HTTP_BAD_REQUEST, // VOD_BAD_REQUEST
NGX_HTTP_SERVICE_UNAVAILABLE, // VOD_BAD_MAPPING
NGX_HTTP_NOT_FOUND, // VOD_EXPIRED
NGX_HTTP_NOT_FOUND, // VOD_NO_STREAMS
NGX_HTTP_NOT_FOUND, // VOD_EMPTY_MAPPING
NGX_HTTP_INTERNAL_SERVER_ERROR, // VOD_NOT_FOUND (not expected to reach top level)
NGX_HTTP_INTERNAL_SERVER_ERROR, // VOD_REDIRECT (not expected to reach top level)
};
static ngx_str_t error_codes[VOD_ERROR_LAST - VOD_ERROR_FIRST] = {
ngx_string("BAD_DATA"),
ngx_string("ALLOC_FAILED"),
ngx_string("UNEXPECTED"),
ngx_string("BAD_REQUEST"),
ngx_string("BAD_MAPPING"),
ngx_string("EXPIRED"),
ngx_string("NO_STREAMS"),
ngx_string("EMPTY_MAPPING"),
ngx_string("UNEXPECTED"),
ngx_string("UNEXPECTED"),
};
static ngx_uint_t ngx_http_vod_status_index;
static ngx_str_t empty_string = ngx_null_string;
void ngx_http_vod_set_status_index(ngx_uint_t index)
{
ngx_http_vod_status_index = index;
}
ngx_int_t
ngx_http_vod_send_response(ngx_http_request_t *r, ngx_str_t *response, ngx_str_t* content_type)
{
ngx_chain_t out;
ngx_int_t rc;
ngx_buf_t* b;
if (!r->header_sent)
{
// set the content type
r->headers_out.content_type = *content_type;
r->headers_out.content_type_len = content_type->len;
// set the status line
r->headers_out.status = NGX_HTTP_OK;
r->headers_out.content_length_n = response->len;
rc = ngx_http_set_etag(r);
if (rc != NGX_OK)
{
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"ngx_http_vod_send_response: ngx_http_set_etag failed");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
// send the headers
rc = ngx_http_send_header(r);
if (rc == NGX_ERROR || rc > NGX_OK)
{
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"ngx_http_vod_send_response: ngx_http_send_header failed %i", rc);
return rc;
}
}
if (r->header_only || r->method == NGX_HTTP_HEAD)
{
return NGX_OK;
}
// wrap the response with ngx_buf_t
b = ngx_calloc_buf(r->pool);
if (b == NULL)
{
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"ngx_http_vod_send_response: ngx_pcalloc failed");
return ngx_http_vod_status_to_ngx_error(r, VOD_ALLOC_FAILED);
}
b->pos = response->data;
b->last = response->data + response->len;
if (response->len > 0)
{
b->temporary = 1;
}
b->last_buf = 1; // this is the last buffer in the buffer chain
// attach the buffer to the chain
out.buf = b;
out.next = NULL;
// send the buffer chain
rc = ngx_http_output_filter(r, &out);
if (rc != NGX_OK && rc != NGX_AGAIN)
{
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"ngx_http_vod_send_response: ngx_http_output_filter failed %i", rc);
return rc;
}
return NGX_OK;
}
ngx_int_t
ngx_http_vod_status_to_ngx_error(
ngx_http_request_t* r,
vod_status_t rc)
{
ngx_http_variable_value_t *vv;
ngx_int_t index;
if (rc < VOD_ERROR_FIRST || rc >= VOD_ERROR_LAST)
{
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
index = rc - VOD_ERROR_FIRST;
// update the status variable
// Note: need to explicitly set the value (instead of calculating it in get_handler)
// so that it won't get lost in case of a redirect to an error page
vv = &r->variables[ngx_http_vod_status_index];
vv->valid = 1;
vv->not_found = 0;
vv->no_cacheable = 0;
vv->data = error_codes[index].data;
vv->len = error_codes[index].len;
return error_map[index];
}
ngx_flag_t
ngx_http_vod_header_exists(ngx_http_request_t* r, ngx_str_t* searched_header)
{
ngx_table_elt_t *header;
ngx_table_elt_t *last_header;
ngx_list_part_t *part;
part = &r->headers_in.headers.part;
while (part)
{
header = part->elts;
last_header = header + part->nelts;
for (; header < last_header; header++)
{
if (header->key.len == searched_header->len &&
ngx_strncasecmp(header->key.data, searched_header->data, searched_header->len) == 0)
{
return 1;
}
}
part = part->next;
}
return 0;
}
static void *
ngx_http_vod_memrchr(const u_char *s, int c, size_t n)
{
const u_char *cp;
for (cp = s + n; cp > s; )
{
if (*(--cp) == (u_char)c)
return (void*)cp;
}
return NULL;
}
ngx_int_t
ngx_http_vod_get_base_url(
ngx_http_request_t* r,
ngx_http_complex_value_t* conf_base_url,
ngx_str_t* file_uri,
ngx_str_t* result)
{
ngx_flag_t use_https;
ngx_str_t base_url;
ngx_str_t* host_name = NULL;
size_t uri_path_len;
size_t result_size;
u_char* last_slash;
u_char* p;
if (conf_base_url != NULL)
{
if (ngx_http_complex_value(
r,
conf_base_url,
&base_url) != NGX_OK)
{
return NGX_ERROR;
}
if (base_url.len == 0)
{
// conf base url evaluated to empty string, use relative URLs
return NGX_OK;
}
if (base_url.data[base_url.len - 1] == '/')
{
file_uri = &empty_string;
}
result_size = base_url.len;
}
else
{
// when the request has no host header (HTTP 1.0), use relative URLs
if (r->headers_in.host == NULL)
{
return NGX_OK;
}
host_name = &r->headers_in.host->value;
result_size = sizeof("https://") - 1 + host_name->len;
}
if (file_uri->len)
{
last_slash = ngx_http_vod_memrchr(file_uri->data, '/', file_uri->len);
if (last_slash == NULL)
{
vod_log_error(VOD_LOG_ERR, r->connection->log, 0,
"ngx_http_vod_get_base_url: no slash found in uri %V", file_uri);
return NGX_ERROR;
}
uri_path_len = last_slash + 1 - file_uri->data;
}
else
{
uri_path_len = 0;
}
// allocate the base url
result_size += uri_path_len + sizeof("/");
p = ngx_palloc(r->pool, result_size);
if (p == NULL)
{
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"ngx_http_vod_get_base_url: ngx_palloc failed");
return NGX_ERROR;
}
// build the url
result->data = p;
if (conf_base_url != NULL)
{
p = vod_copy(p, base_url.data, base_url.len);
}
else
{
#if (NGX_HTTP_SSL)
use_https = (r->connection->ssl != NULL);
#else
use_https = 0;
#endif // NGX_HTTP_SSL
if (use_https)
{
p = ngx_copy(p, "https://", sizeof("https://") - 1);
}
else
{
p = ngx_copy(p, "http://", sizeof("http://") - 1);
}
p = ngx_copy(p, host_name->data, host_name->len);
}
p = ngx_copy(p, file_uri->data, uri_path_len);
*p = '\0';
result->len = p - result->data;
if (result->len > result_size)
{
vod_log_error(VOD_LOG_ERR, r->connection->log, 0,
"ngx_http_vod_get_base_url: result length %uz exceeded allocated length %uz",
result->len, result_size);
return NGX_ERROR;
}
return NGX_OK;
}
ngx_int_t
ngx_http_vod_merge_string_parts(ngx_http_request_t* r, ngx_str_t* parts, uint32_t part_count, ngx_str_t* result)
{
ngx_str_t* cur_part;
ngx_str_t* last_part = parts + part_count;
u_char* p;
size_t len = 0;
for (cur_part = parts; cur_part < last_part; cur_part++)
{
len += cur_part->len;
}
p = ngx_palloc(r->pool, len);
if (p == NULL)
{
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"ngx_http_vod_merge_string_parts: ngx_palloc failed");
return ngx_http_vod_status_to_ngx_error(r, VOD_ALLOC_FAILED);
}
result->data = p;
for (cur_part = parts; cur_part < last_part; cur_part++)
{
p = ngx_copy(p, cur_part->data, cur_part->len);
}
result->len = p - result->data;
return NGX_OK;
}
// Implemented according to nginx's ngx_http_range_parse, dropping multi range support
ngx_int_t
ngx_http_vod_range_parse(ngx_str_t* range, off_t content_length, off_t* out_start, off_t* out_end)
{
u_char *p;
off_t start, end, cutoff, cutlim;
ngx_uint_t suffix;
if (range->len < 7 ||
ngx_strncasecmp(range->data,
(u_char *) "bytes=", 6) != 0) {
return NGX_HTTP_RANGE_NOT_SATISFIABLE;
}
p = range->data + 6;
cutoff = NGX_MAX_OFF_T_VALUE / 10;
cutlim = NGX_MAX_OFF_T_VALUE % 10;
start = 0;
end = 0;
suffix = 0;
while (*p == ' ') { p++; }
if (*p != '-') {
if (*p < '0' || *p > '9') {
return NGX_HTTP_RANGE_NOT_SATISFIABLE;
}
while (*p >= '0' && *p <= '9') {
if (start >= cutoff && (start > cutoff || *p - '0' > cutlim)) {
return NGX_HTTP_RANGE_NOT_SATISFIABLE;
}
start = start * 10 + *p++ - '0';
}
while (*p == ' ') { p++; }
if (*p++ != '-') {
return NGX_HTTP_RANGE_NOT_SATISFIABLE;
}
while (*p == ' ') { p++; }
if (*p == '\0') {
end = content_length;
goto found;
}
} else {
suffix = 1;
p++;
}
if (*p < '0' || *p > '9') {
return NGX_HTTP_RANGE_NOT_SATISFIABLE;
}
while (*p >= '0' && *p <= '9') {
if (end >= cutoff && (end > cutoff || *p - '0' > cutlim)) {
return NGX_HTTP_RANGE_NOT_SATISFIABLE;
}
end = end * 10 + *p++ - '0';
}
while (*p == ' ') { p++; }
if (*p != '\0') {
return NGX_HTTP_RANGE_NOT_SATISFIABLE;
}
if (suffix) {
start = content_length - end;
end = content_length - 1;
}
if (end >= content_length) {
end = content_length;
} else {
end++;
}
found:
if (start >= end) {
return NGX_HTTP_RANGE_NOT_SATISFIABLE;
}
*out_start = start;
*out_end = end;
return NGX_OK;
}
// A run down version of ngx_http_set_expires
ngx_int_t
ngx_http_vod_set_expires(ngx_http_request_t *r, time_t expires_time)
{
size_t len;
time_t now, max_age;
ngx_uint_t i;
ngx_table_elt_t *e, *cc, **ccp;
e = r->headers_out.expires;
if (e == NULL) {
e = ngx_list_push(&r->headers_out.headers);
if (e == NULL) {
return NGX_ERROR;
}
r->headers_out.expires = e;
e->hash = 1;
ngx_str_set(&e->key, "Expires");
}
len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT");
e->value.len = len - 1;
ccp = r->headers_out.cache_control.elts;
if (ccp == NULL) {
if (ngx_array_init(&r->headers_out.cache_control, r->pool,
1, sizeof(ngx_table_elt_t *))
!= NGX_OK)
{
return NGX_ERROR;
}
ccp = ngx_array_push(&r->headers_out.cache_control);
if (ccp == NULL) {
return NGX_ERROR;
}
cc = ngx_list_push(&r->headers_out.headers);
if (cc == NULL) {
return NGX_ERROR;
}
cc->hash = 1;
ngx_str_set(&cc->key, "Cache-Control");
*ccp = cc;
}
else {
for (i = 1; i < r->headers_out.cache_control.nelts; i++) {
ccp[i]->hash = 0;
}
cc = ccp[0];
}
e->value.data = ngx_pnalloc(r->pool, len);
if (e->value.data == NULL) {
return NGX_ERROR;
}
if (expires_time == 0) {
ngx_memcpy(e->value.data, ngx_cached_http_time.data,
ngx_cached_http_time.len + 1);
ngx_str_set(&cc->value, "max-age=0");
return NGX_OK;
}
now = ngx_time();
max_age = expires_time;
expires_time += now;
ngx_http_time(e->value.data, expires_time);
if (max_age < 0) {
ngx_str_set(&cc->value, "no-cache");
return NGX_OK;
}
cc->value.data = ngx_pnalloc(r->pool,
sizeof("max-age=") + NGX_TIME_T_LEN + 1);
if (cc->value.data == NULL) {
return NGX_ERROR;
}
cc->value.len = ngx_sprintf(cc->value.data, "max-age=%T", max_age)
- cc->value.data;
return NGX_OK;
}