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ESPAsyncWebServer/src/WebResponses.cpp

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/*
Asynchronous WebServer library for Espressif MCUs
Copyright (c) 2016 Hristo Gochkov. All rights reserved.
This file is part of the esp8266 core for Arduino environment.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "ESPAsyncWebServer.h"
#include "WebResponseImpl.h"
#include "cbuf.h"
// Since ESP8266 does not link memchr by default, here's its implementation.
void* memchr(void* ptr, int ch, size_t count)
{
unsigned char* p = static_cast<unsigned char*>(ptr);
while(count--)
if(*p++ == static_cast<unsigned char>(ch))
return --p;
return nullptr;
}
/*
* Abstract Response
* */
const char* AsyncWebServerResponse::_responseCodeToString(int code) {
switch (code) {
case 100: return "Continue";
case 101: return "Switching Protocols";
case 200: return "OK";
case 201: return "Created";
case 202: return "Accepted";
case 203: return "Non-Authoritative Information";
case 204: return "No Content";
case 205: return "Reset Content";
case 206: return "Partial Content";
case 300: return "Multiple Choices";
case 301: return "Moved Permanently";
case 302: return "Found";
case 303: return "See Other";
case 304: return "Not Modified";
case 305: return "Use Proxy";
case 307: return "Temporary Redirect";
case 400: return "Bad Request";
case 401: return "Unauthorized";
case 402: return "Payment Required";
case 403: return "Forbidden";
case 404: return "Not Found";
case 405: return "Method Not Allowed";
case 406: return "Not Acceptable";
case 407: return "Proxy Authentication Required";
case 408: return "Request Time-out";
case 409: return "Conflict";
case 410: return "Gone";
case 411: return "Length Required";
case 412: return "Precondition Failed";
case 413: return "Request Entity Too Large";
case 414: return "Request-URI Too Large";
case 415: return "Unsupported Media Type";
case 416: return "Requested range not satisfiable";
case 417: return "Expectation Failed";
case 500: return "Internal Server Error";
case 501: return "Not Implemented";
case 502: return "Bad Gateway";
case 503: return "Service Unavailable";
case 504: return "Gateway Time-out";
case 505: return "HTTP Version not supported";
default: return "";
}
}
AsyncWebServerResponse::AsyncWebServerResponse()
: _code(0)
, _headers(LinkedList<AsyncWebHeader *>([](AsyncWebHeader *h){ delete h; }))
, _contentType()
, _contentLength(0)
, _sendContentLength(true)
, _chunked(false)
, _headLength(0)
, _sentLength(0)
, _ackedLength(0)
, _writtenLength(0)
, _state(RESPONSE_SETUP)
{
for(auto header: DefaultHeaders::Instance()) {
_headers.add(new AsyncWebHeader(header->name(), header->value()));
}
}
AsyncWebServerResponse::~AsyncWebServerResponse(){
_headers.free();
}
void AsyncWebServerResponse::setCode(int code){
if(_state == RESPONSE_SETUP)
_code = code;
}
void AsyncWebServerResponse::setContentLength(size_t len){
if(_state == RESPONSE_SETUP)
_contentLength = len;
}
void AsyncWebServerResponse::setContentType(const String& type){
if(_state == RESPONSE_SETUP)
_contentType = type;
}
void AsyncWebServerResponse::addHeader(const String& name, const String& value){
_headers.add(new AsyncWebHeader(name, value));
}
String AsyncWebServerResponse::_assembleHead(uint8_t version){
if(version){
addHeader("Accept-Ranges","none");
if(_chunked)
addHeader("Transfer-Encoding","chunked");
}
String out = String();
int bufSize = 300;
char buf[bufSize];
snprintf(buf, bufSize, "HTTP/1.%d %d %s\r\n", version, _code, _responseCodeToString(_code));
out.concat(buf);
if(_sendContentLength) {
snprintf(buf, bufSize, "Content-Length: %d\r\n", _contentLength);
out.concat(buf);
}
if(_contentType.length()) {
snprintf(buf, bufSize, "Content-Type: %s\r\n", _contentType.c_str());
out.concat(buf);
}
for(const auto& header: _headers){
snprintf(buf, bufSize, "%s: %s\r\n", header->name().c_str(), header->value().c_str());
out.concat(buf);
}
_headers.free();
out.concat("\r\n");
_headLength = out.length();
return out;
}
bool AsyncWebServerResponse::_started() const { return _state > RESPONSE_SETUP; }
bool AsyncWebServerResponse::_finished() const { return _state > RESPONSE_WAIT_ACK; }
bool AsyncWebServerResponse::_failed() const { return _state == RESPONSE_FAILED; }
bool AsyncWebServerResponse::_sourceValid() const { return false; }
void AsyncWebServerResponse::_respond(AsyncWebServerRequest *request){ _state = RESPONSE_END; request->client()->close(); }
size_t AsyncWebServerResponse::_ack(AsyncWebServerRequest *request, size_t len, uint32_t time){ (void)request; (void)len; (void)time; return 0; }
/*
* String/Code Response
* */
AsyncBasicResponse::AsyncBasicResponse(int code, const String& contentType, const String& content){
_code = code;
_content = content;
_contentType = contentType;
if(_content.length()){
_contentLength = _content.length();
if(!_contentType.length())
_contentType = "text/plain";
}
addHeader("Connection","close");
}
void AsyncBasicResponse::_respond(AsyncWebServerRequest *request){
_state = RESPONSE_HEADERS;
String out = _assembleHead(request->version());
size_t outLen = out.length();
size_t space = request->client()->space();
if(!_contentLength && space >= outLen){
_writtenLength += request->client()->write(out.c_str(), outLen);
_state = RESPONSE_WAIT_ACK;
} else if(_contentLength && space >= outLen + _contentLength){
out += _content;
outLen += _contentLength;
_writtenLength += request->client()->write(out.c_str(), outLen);
_state = RESPONSE_WAIT_ACK;
} else if(space && space < outLen){
String partial = out.substring(0, space);
_content = out.substring(space) + _content;
_contentLength += outLen - space;
_writtenLength += request->client()->write(partial.c_str(), partial.length());
_state = RESPONSE_CONTENT;
} else if(space > outLen && space < (outLen + _contentLength)){
size_t shift = space - outLen;
outLen += shift;
_sentLength += shift;
out += _content.substring(0, shift);
_content = _content.substring(shift);
_writtenLength += request->client()->write(out.c_str(), outLen);
_state = RESPONSE_CONTENT;
} else {
_content = out + _content;
_contentLength += outLen;
_state = RESPONSE_CONTENT;
}
}
size_t AsyncBasicResponse::_ack(AsyncWebServerRequest *request, size_t len, uint32_t time){
(void)time;
_ackedLength += len;
if(_state == RESPONSE_CONTENT){
size_t available = _contentLength - _sentLength;
size_t space = request->client()->space();
//we can fit in this packet
if(space > available){
_writtenLength += request->client()->write(_content.c_str(), available);
_content = String();
_state = RESPONSE_WAIT_ACK;
return available;
}
//send some data, the rest on ack
String out = _content.substring(0, space);
_content = _content.substring(space);
_sentLength += space;
_writtenLength += request->client()->write(out.c_str(), space);
return space;
} else if(_state == RESPONSE_WAIT_ACK){
if(_ackedLength >= _writtenLength){
_state = RESPONSE_END;
}
}
return 0;
}
/*
* Abstract Response
* */
AsyncAbstractResponse::AsyncAbstractResponse(AwsTemplateProcessor callback): _callback(callback)
{
// In case of template processing, we're unable to determine real response size
if(callback) {
_contentLength = 0;
_sendContentLength = false;
_chunked = true;
}
}
void AsyncAbstractResponse::_respond(AsyncWebServerRequest *request){
addHeader("Connection","close");
_head = _assembleHead(request->version());
_state = RESPONSE_HEADERS;
_ack(request, 0, 0);
}
size_t AsyncAbstractResponse::_ack(AsyncWebServerRequest *request, size_t len, uint32_t time){
(void)time;
if(!_sourceValid()){
_state = RESPONSE_FAILED;
request->client()->close();
return 0;
}
_ackedLength += len;
size_t space = request->client()->space();
size_t headLen = _head.length();
if(_state == RESPONSE_HEADERS){
if(space >= headLen){
_state = RESPONSE_CONTENT;
space -= headLen;
} else {
String out = _head.substring(0, space);
_head = _head.substring(space);
_writtenLength += request->client()->write(out.c_str(), out.length());
return out.length();
}
}
if(_state == RESPONSE_CONTENT){
size_t outLen;
if(_chunked){
if(space <= 8){
return 0;
}
outLen = space;
} else if(!_sendContentLength){
outLen = space;
} else {
outLen = ((_contentLength - _sentLength) > space)?space:(_contentLength - _sentLength);
}
uint8_t *buf = (uint8_t *)malloc(outLen+headLen);
if (!buf) {
// os_printf("_ack malloc %d failed\n", outLen+headLen);
return 0;
}
if(headLen){
memcpy(buf, _head.c_str(), _head.length());
}
size_t readLen = 0;
if(_chunked){
// HTTP 1.1 allows leading zeros in chunk length. Or spaces may be added.
// See RFC2616 sections 2, 3.6.1.
readLen = _fillBufferAndProcessTemplates(buf+headLen+6, outLen - 8);
if(readLen == RESPONSE_TRY_AGAIN){
free(buf);
return 0;
}
outLen = sprintf((char*)buf+headLen, "%x", readLen) + headLen;
while(outLen < headLen + 4) buf[outLen++] = ' ';
buf[outLen++] = '\r';
buf[outLen++] = '\n';
outLen += readLen;
buf[outLen++] = '\r';
buf[outLen++] = '\n';
} else {
readLen = _fillBufferAndProcessTemplates(buf+headLen, outLen);
if(readLen == RESPONSE_TRY_AGAIN){
free(buf);
return 0;
}
outLen = readLen + headLen;
}
if(headLen){
_head = String();
}
if(outLen){
_writtenLength += request->client()->write((const char*)buf, outLen);
}
if(_chunked){
_sentLength += readLen;
} else {
_sentLength += outLen - headLen;
}
free(buf);
if((_chunked && readLen == 0) || (!_sendContentLength && outLen == 0) || (!_chunked && _sentLength == _contentLength)){
_state = RESPONSE_WAIT_ACK;
}
return outLen;
} else if(_state == RESPONSE_WAIT_ACK){
if(!_sendContentLength || _ackedLength >= _writtenLength){
_state = RESPONSE_END;
if(!_chunked && !_sendContentLength)
request->client()->close(true);
}
}
return 0;
}
size_t AsyncAbstractResponse::_readDataFromCacheOrContent(uint8_t* data, const size_t len)
{
// If we have something in cache, copy it to buffer
const size_t readFromCache = std::min(len, _cache.size());
if(readFromCache) {
memcpy(data, _cache.data(), readFromCache);
_cache.erase(_cache.begin(), _cache.begin() + readFromCache);
}
// If we need to read more...
const size_t needFromFile = len - readFromCache;
const size_t readFromContent = _fillBuffer(data + readFromCache, needFromFile);
return readFromCache + readFromContent;
}
size_t AsyncAbstractResponse::_fillBufferAndProcessTemplates(uint8_t* data, size_t len)
{
if(!_callback)
return _fillBuffer(data, len);
const size_t originalLen = len;
len = _readDataFromCacheOrContent(data, len);
// Now we've read 'len' bytes, either from cache or from file
// Search for template placeholders
uint8_t* pTemplateStart = data;
while((pTemplateStart < &data[len]) && (pTemplateStart = (uint8_t*)memchr(pTemplateStart, TEMPLATE_PLACEHOLDER, &data[len - 1] - pTemplateStart + 1))) { // data[0] ... data[len - 1]
uint8_t* pTemplateEnd = (pTemplateStart < &data[len - 1]) ? (uint8_t*)memchr(pTemplateStart + 1, TEMPLATE_PLACEHOLDER, &data[len - 1] - pTemplateStart) : nullptr;
// temporary buffer to hold parameter name
uint8_t buf[TEMPLATE_PARAM_NAME_LENGTH + 1];
String paramName;
// If closing placeholder is found:
if(pTemplateEnd) {
// prepare argument to callback
const size_t paramNameLength = std::min(sizeof(buf) - 1, (unsigned int)(pTemplateEnd - pTemplateStart - 1));
if(paramNameLength) {
memcpy(buf, pTemplateStart + 1, paramNameLength);
buf[paramNameLength] = 0;
paramName = String(reinterpret_cast<char*>(buf));
} else { // double percent sign encountered, this is single percent sign escaped.
// remove the 2nd percent sign
memmove(pTemplateEnd, pTemplateEnd + 1, &data[len] - pTemplateEnd - 1);
len += _readDataFromCacheOrContent(&data[len - 1], 1) - 1;
++pTemplateStart;
}
} else if(&data[len - 1] - pTemplateStart + 1 < TEMPLATE_PARAM_NAME_LENGTH + 2) { // closing placeholder not found, check if it's in the remaining file data
memcpy(buf, pTemplateStart + 1, &data[len - 1] - pTemplateStart);
const size_t readFromCacheOrContent = _readDataFromCacheOrContent(buf + (&data[len - 1] - pTemplateStart), TEMPLATE_PARAM_NAME_LENGTH + 2 - (&data[len - 1] - pTemplateStart + 1));
if(readFromCacheOrContent) {
pTemplateEnd = (uint8_t*)memchr(buf + (&data[len - 1] - pTemplateStart), TEMPLATE_PLACEHOLDER, readFromCacheOrContent);
if(pTemplateEnd) {
// prepare argument to callback
*pTemplateEnd = 0;
paramName = String(reinterpret_cast<char*>(buf));
// Copy remaining read-ahead data into cache
_cache.insert(_cache.begin(), pTemplateEnd + 1, buf + (&data[len - 1] - pTemplateStart) + readFromCacheOrContent);
pTemplateEnd = &data[len - 1];
}
else // closing placeholder not found in file data, store found percent symbol as is and advance to the next position
{
// but first, store read file data in cache
_cache.insert(_cache.begin(), buf + (&data[len - 1] - pTemplateStart), buf + (&data[len - 1] - pTemplateStart) + readFromCacheOrContent);
++pTemplateStart;
}
}
else // closing placeholder not found in content data, store found percent symbol as is and advance to the next position
++pTemplateStart;
}
else // closing placeholder not found in content data, store found percent symbol as is and advance to the next position
++pTemplateStart;
if(paramName.length()) {
// call callback and replace with result.
// Everything in range [pTemplateStart, pTemplateEnd] can be safely replaced with parameter value.
// Data after pTemplateEnd may need to be moved.
// The first byte of data after placeholder is located at pTemplateEnd + 1.
// It should be located at pTemplateStart + numBytesCopied (to begin right after inserted parameter value).
const String paramValue(_callback(paramName));
const char* pvstr = paramValue.c_str();
const unsigned int pvlen = paramValue.length();
const size_t numBytesCopied = std::min(pvlen, static_cast<unsigned int>(&data[originalLen - 1] - pTemplateStart + 1));
// make room for param value
// 1. move extra data to cache if parameter value is longer than placeholder AND if there is no room to store
if((pTemplateEnd + 1 < pTemplateStart + numBytesCopied) && (originalLen - (pTemplateStart + numBytesCopied - pTemplateEnd - 1) < len)) {
_cache.insert(_cache.begin(), &data[originalLen - (pTemplateStart + numBytesCopied - pTemplateEnd - 1)], &data[len]);
//2. parameter value is longer than placeholder text, push the data after placeholder which not saved into cache further to the end
memmove(pTemplateStart + numBytesCopied, pTemplateEnd + 1, &data[originalLen] - pTemplateStart - numBytesCopied);
len = originalLen; // fix issue with truncated data, not sure if it has any side effects
} else if(pTemplateEnd + 1 != pTemplateStart + numBytesCopied)
//2. Either parameter value is shorter than placeholder text OR there is enough free space in buffer to fit.
// Move the entire data after the placeholder
memmove(pTemplateStart + numBytesCopied, pTemplateEnd + 1, &data[len] - pTemplateEnd - 1);
// 3. replace placeholder with actual value
memcpy(pTemplateStart, pvstr, numBytesCopied);
// If result is longer than buffer, copy the remainder into cache (this could happen only if placeholder text itself did not fit entirely in buffer)
if(numBytesCopied < pvlen) {
_cache.insert(_cache.begin(), pvstr + numBytesCopied, pvstr + pvlen);
} else if(pTemplateStart + numBytesCopied < pTemplateEnd + 1) { // result is copied fully; if result is shorter than placeholder text...
// there is some free room, fill it from cache
const size_t roomFreed = pTemplateEnd + 1 - pTemplateStart - numBytesCopied;
const size_t totalFreeRoom = originalLen - len + roomFreed;
len += _readDataFromCacheOrContent(&data[len - roomFreed], totalFreeRoom) - roomFreed;
} else { // result is copied fully; it is longer than placeholder text
const size_t roomTaken = pTemplateStart + numBytesCopied - pTemplateEnd - 1;
len = std::min(len + roomTaken, originalLen);
}
}
} // while(pTemplateStart)
return len;
}
/*
* File Response
* */
AsyncFileResponse::~AsyncFileResponse(){
if(_content)
_content.close();
}
void AsyncFileResponse::_setContentType(const String& path){
if (path.endsWith(".html")) _contentType = "text/html";
else if (path.endsWith(".htm")) _contentType = "text/html";
else if (path.endsWith(".css")) _contentType = "text/css";
else if (path.endsWith(".json")) _contentType = "application/json";
else if (path.endsWith(".js")) _contentType = "application/javascript";
else if (path.endsWith(".png")) _contentType = "image/png";
else if (path.endsWith(".gif")) _contentType = "image/gif";
else if (path.endsWith(".jpg")) _contentType = "image/jpeg";
else if (path.endsWith(".ico")) _contentType = "image/x-icon";
else if (path.endsWith(".svg")) _contentType = "image/svg+xml";
else if (path.endsWith(".eot")) _contentType = "font/eot";
else if (path.endsWith(".woff")) _contentType = "font/woff";
else if (path.endsWith(".woff2")) _contentType = "font/woff2";
else if (path.endsWith(".ttf")) _contentType = "font/ttf";
else if (path.endsWith(".xml")) _contentType = "text/xml";
else if (path.endsWith(".pdf")) _contentType = "application/pdf";
else if (path.endsWith(".zip")) _contentType = "application/zip";
else if(path.endsWith(".gz")) _contentType = "application/x-gzip";
else _contentType = "text/plain";
}
AsyncFileResponse::AsyncFileResponse(FS &fs, const String& path, const String& contentType, bool download, AwsTemplateProcessor callback): AsyncAbstractResponse(callback){
_code = 200;
_path = path;
if(!download && !fs.exists(_path) && fs.exists(_path+".gz")){
_path = _path+".gz";
addHeader("Content-Encoding", "gzip");
_callback = nullptr; // Unable to process zipped templates
_sendContentLength = true;
_chunked = false;
}
_content = fs.open(_path, "r");
_contentLength = _content.size();
if(contentType == "")
_setContentType(path);
else
_contentType = contentType;
int filenameStart = path.lastIndexOf('/') + 1;
char buf[26+path.length()-filenameStart];
char* filename = (char*)path.c_str() + filenameStart;
if(download) {
// set filename and force download
snprintf(buf, sizeof (buf), "attachment; filename=\"%s\"", filename);
} else {
// set filename and force rendering
snprintf(buf, sizeof (buf), "inline; filename=\"%s\"", filename);
}
addHeader("Content-Disposition", buf);
}
AsyncFileResponse::AsyncFileResponse(File content, const String& path, const String& contentType, bool download, AwsTemplateProcessor callback): AsyncAbstractResponse(callback){
_code = 200;
_path = path;
if(!download && String(content.name()).endsWith(".gz") && !path.endsWith(".gz")){
addHeader("Content-Encoding", "gzip");
_callback = nullptr; // Unable to process gzipped templates
_sendContentLength = true;
_chunked = false;
}
_content = content;
_contentLength = _content.size();
if(contentType == "")
_setContentType(path);
else
_contentType = contentType;
int filenameStart = path.lastIndexOf('/') + 1;
char buf[26+path.length()-filenameStart];
char* filename = (char*)path.c_str() + filenameStart;
if(download) {
snprintf(buf, sizeof (buf), "attachment; filename=\"%s\"", filename);
} else {
snprintf(buf, sizeof (buf), "inline; filename=\"%s\"", filename);
}
addHeader("Content-Disposition", buf);
}
size_t AsyncFileResponse::_fillBuffer(uint8_t *data, size_t len){
return _content.read(data, len);
}
/*
* Stream Response
* */
AsyncStreamResponse::AsyncStreamResponse(Stream &stream, const String& contentType, size_t len, AwsTemplateProcessor callback): AsyncAbstractResponse(callback) {
_code = 200;
_content = &stream;
_contentLength = len;
_contentType = contentType;
}
size_t AsyncStreamResponse::_fillBuffer(uint8_t *data, size_t len){
size_t available = _content->available();
size_t outLen = (available > len)?len:available;
size_t i;
for(i=0;i<outLen;i++)
data[i] = _content->read();
return outLen;
}
/*
* Callback Response
* */
AsyncCallbackResponse::AsyncCallbackResponse(const String& contentType, size_t len, AwsResponseFiller callback, AwsTemplateProcessor templateCallback): AsyncAbstractResponse(templateCallback) {
_code = 200;
_content = callback;
_contentLength = len;
if(!len)
_sendContentLength = false;
_contentType = contentType;
_filledLength = 0;
}
size_t AsyncCallbackResponse::_fillBuffer(uint8_t *data, size_t len){
size_t ret = _content(data, len, _filledLength);
if(ret != RESPONSE_TRY_AGAIN){
_filledLength += ret;
}
return ret;
}
/*
* Chunked Response
* */
AsyncChunkedResponse::AsyncChunkedResponse(const String& contentType, AwsResponseFiller callback, AwsTemplateProcessor processorCallback): AsyncAbstractResponse(processorCallback) {
_code = 200;
_content = callback;
_contentLength = 0;
_contentType = contentType;
_sendContentLength = false;
_chunked = true;
_filledLength = 0;
}
size_t AsyncChunkedResponse::_fillBuffer(uint8_t *data, size_t len){
size_t ret = _content(data, len, _filledLength);
if(ret != RESPONSE_TRY_AGAIN){
_filledLength += ret;
}
return ret;
}
/*
* Progmem Response
* */
AsyncProgmemResponse::AsyncProgmemResponse(int code, const String& contentType, const uint8_t * content, size_t len, AwsTemplateProcessor callback): AsyncAbstractResponse(callback) {
_code = code;
_content = content;
_contentType = contentType;
_contentLength = len;
_readLength = 0;
}
size_t AsyncProgmemResponse::_fillBuffer(uint8_t *data, size_t len){
size_t left = _contentLength - _readLength;
if (left > len) {
memcpy_P(data, _content + _readLength, len);
_readLength += len;
return len;
}
memcpy_P(data, _content + _readLength, left);
_readLength += left;
return left;
}
/*
* Response Stream (You can print/write/printf to it, up to the contentLen bytes)
* */
AsyncResponseStream::AsyncResponseStream(const String& contentType, size_t bufferSize){
_code = 200;
_contentLength = 0;
_contentType = contentType;
_content = new cbuf(bufferSize);
}
AsyncResponseStream::~AsyncResponseStream(){
delete _content;
}
size_t AsyncResponseStream::_fillBuffer(uint8_t *buf, size_t maxLen){
return _content->read((char*)buf, maxLen);
}
size_t AsyncResponseStream::write(const uint8_t *data, size_t len){
if(_started())
return 0;
if(len > _content->room()){
size_t needed = len - _content->room();
_content->resizeAdd(needed);
}
size_t written = _content->write((const char*)data, len);
_contentLength += written;
return written;
}
size_t AsyncResponseStream::write(uint8_t data){
return write(&data, 1);
}
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