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Refactored web-server

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pull/193/head
cskarai 8 years ago committed by Thorsten von Eicken
parent 22664fa55f
commit 9e6d9932d3
2 changed files with 343 additions and 275 deletions
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  1. 598
      web-server/web-server.c
  2. 20
      web-server/web-server.h

598
web-server/web-server.c
Unescape View File

@ -8,14 +8,31 @@
#include "cmd.h"
#include "serbridge.h"
// the file is responsible for handling user defined web-pages
// - collects HTML files from user image, shows them on the left frame
// - handles JSON data coming from the browser
// - handles SLIP messages coming from MCU
#define WEB_CB "webCb"
#define MAX_ARGUMENT_BUFFER_SIZE 1024
#define MAX_VARS 20
struct ArgumentBuffer
{
char argBuffer[MAX_ARGUMENT_BUFFER_SIZE];
int argBufferPtr;
int numberOfArgs;
};
static char* web_server_reasons[] = {
"load", "refresh", "button", "submit"
"load", // readable name for RequestReason::LOAD
"refresh", // readable name for RequestReason::REFRESH
"button", // readable name for RequestReason::BUTTON
"submit" // readable name for RequestReason::SUBMIT
};
// this variable contains the names of the user defined pages
// this information appears at the left frame below of the built in URL-s
// format: ,"UserPage1", "/UserPage1.html", "UserPage2", "/UserPage2.html",
char * webServerPages = NULL;
char * ICACHE_FLASH_ATTR WEB_UserPages()
@ -23,6 +40,7 @@ char * ICACHE_FLASH_ATTR WEB_UserPages()
return webServerPages;
}
// generates the content of webServerPages variable (called at booting/web page uploading)
void ICACHE_FLASH_ATTR WEB_BrowseFiles()
{
char buffer[1024];
@ -34,37 +52,35 @@ void ICACHE_FLASH_ATTR WEB_BrowseFiles()
espFsIteratorInit(userPageCtx, &it);
while( espFsIteratorNext(&it) )
{
int nlen = os_strlen(it.name);
if( nlen >= 6 )
int nameLen = os_strlen(it.name);
if( nameLen >= 6 )
{
if( os_strcmp( it.name + nlen-5, ".html" ) == 0 )
// fetch HTML files
if( os_strcmp( it.name + nameLen-5, ".html" ) == 0 )
{
char sh_name[17];
int slashPos = nameLen - 5;
int spos = nlen-5;
while( spos > 0 )
{
if( it.name[spos+1] == '/' )
break;
spos--;
}
// chop path and .html from the name
while( slashPos > 0 && it.name[slashPos-1] != '/' )
slashPos--;
int ps = nlen-5-spos;
if( ps > 16 )
ps = 16;
os_memcpy(sh_name, it.name + spos, ps);
sh_name[ps] = 0;
// here we check buffer overrun
int maxLen = 10 + os_strlen( it.name ) + (nameLen - slashPos -5);
if( maxLen >= sizeof(buffer) )
break;
os_strcat(buffer, ", \"");
os_strcat(buffer, sh_name);
int writePos = os_strlen(buffer);
for( int i=slashPos; i < nameLen-5; i++ )
buffer[writePos++] = it.name[i];
buffer[writePos] = 0; // terminating zero
os_strcat(buffer, "\", \"/");
os_strcat(buffer, it.name);
os_strcat(buffer, "\"");
}
}
if( os_strlen(buffer) > 600 )
break;
}
}
@ -76,6 +92,7 @@ void ICACHE_FLASH_ATTR WEB_BrowseFiles()
os_memcpy( webServerPages, buffer, len );
}
// initializer
void ICACHE_FLASH_ATTR WEB_Init()
{
espFsInit(userPageCtx, (void *)getUserPageSectionStart(), ESPFS_FLASH);
@ -83,288 +100,339 @@ void ICACHE_FLASH_ATTR WEB_Init()
os_printf("Valid user file system found!\n");
else
os_printf("No user file system found!\n");
WEB_BrowseFiles();
WEB_BrowseFiles(); // collect user defined HTML files
}
int ICACHE_FLASH_ATTR WEB_CgiJsonHook(HttpdConnData *connData)
// initializes the argument buffer
static void WEB_argInit(struct ArgumentBuffer * argBuffer)
{
if (connData->conn==NULL) return HTTPD_CGI_DONE; // Connection aborted. Clean up.
argBuffer->numberOfArgs = 0;
argBuffer->argBufferPtr = 0;
}
// adds an argument to the argument buffer (returns 0 if successful)
static int WEB_addArg(struct ArgumentBuffer * argBuffer, char * arg, int argLen )
{
if( argBuffer->argBufferPtr + argLen + sizeof(int) >= MAX_ARGUMENT_BUFFER_SIZE )
return -1; // buffer overflow
void * cgiData = connData->cgiData;
os_memcpy(argBuffer->argBuffer + argBuffer->argBufferPtr, &argLen, sizeof(int));
if( cgiData == NULL )
if( argLen != 0 )
{
if( !flashConfig.slip_enable )
{
errorResponse(connData, 400, "Slip processing is disabled!");
return HTTPD_CGI_DONE;
}
CmdCallback* cb = cmdGetCbByName( WEB_CB );
if( cb == NULL )
{
errorResponse(connData, 500, "No MCU callback is registered!");
return HTTPD_CGI_DONE;
}
if( serbridgeInProgramming() )
{
errorResponse(connData, 500, "Slip disabled at programming mode!");
return HTTPD_CGI_DONE;
}
char reasonBuf[16];
int i;
int len = httpdFindArg(connData->getArgs, "reason", reasonBuf, sizeof(reasonBuf));
if( len < 0 )
{
errorResponse(connData, 400, "No reason specified!");
return HTTPD_CGI_DONE;
}
RequestReason reason = INVALID;
for(i=0; i < sizeof(web_server_reasons)/sizeof(char *); i++)
{
if( os_strcmp( web_server_reasons[i], reasonBuf ) == 0 )
reason = (RequestReason)i;
}
os_memcpy( argBuffer->argBuffer + argBuffer->argBufferPtr + sizeof(int), arg, argLen );
argBuffer->numberOfArgs++;
}
argBuffer->argBufferPtr += argLen + sizeof(int);
return 0;
}
// creates and sends a SLIP message from the argument buffer
static void WEB_sendArgBuffer(struct ArgumentBuffer * argBuffer, HttpdConnData *connData, int id, RequestReason reason)
{
cmdResponseStart(CMD_WEB_REQ_CB, id, 4 + argBuffer->numberOfArgs);
uint16_t r = (uint16_t)reason;
cmdResponseBody(&r, sizeof(uint16_t)); // 1st argument: reason
cmdResponseBody(&connData->conn->proto.tcp->remote_ip, 4); // 2nd argument: IP
cmdResponseBody(&connData->conn->proto.tcp->remote_port, sizeof(uint16_t)); // 3rd argument: port
cmdResponseBody(connData->url, os_strlen(connData->url)); // 4th argument: URL
int p = 0;
for( int j=0; j < argBuffer->numberOfArgs; j++ )
{
int argLen;
os_memcpy( &argLen, argBuffer->argBuffer + p, sizeof(int) );
if( reason == INVALID )
{
errorResponse(connData, 400, "Invalid reason!");
char * arg = argBuffer->argBuffer + p + sizeof(int);
cmdResponseBody(arg, argLen);
p += argLen + sizeof(int);
}
cmdResponseEnd();
}
// this method processes SLIP data from MCU and converts to JSON
// this method receives JSON from the browser, sends SLIP data to MCU
static int ICACHE_FLASH_ATTR WEB_handleJSONRequest(HttpdConnData *connData)
{
if( !flashConfig.slip_enable )
{
errorResponse(connData, 400, "Slip processing is disabled!");
return HTTPD_CGI_DONE;
}
CmdCallback* cb = cmdGetCbByName( WEB_CB );
if( cb == NULL )
{
errorResponse(connData, 500, "No MCU callback is registered!");
return HTTPD_CGI_DONE;
}
if( serbridgeInProgramming() )
{
errorResponse(connData, 500, "Slip disabled at uploading program onto the MCU!");
return HTTPD_CGI_DONE;
}
char reasonBuf[16];
int i;
int len = httpdFindArg(connData->getArgs, "reason", reasonBuf, sizeof(reasonBuf));
if( len < 0 )
{
errorResponse(connData, 400, "No reason specified!");
return HTTPD_CGI_DONE;
}
char body[1024];
int bodyPtr = 0;
int argNum = 0;
char *argPos[MAX_VARS];
int argLen[MAX_VARS];
switch(reason)
{
case BUTTON:
argLen[0] = httpdFindArg(connData->getArgs, "id", body, sizeof(body));
if( argLen[0] <= 0 )
}
RequestReason reason = INVALID;
for(i=0; i < sizeof(web_server_reasons)/sizeof(char *); i++)
{
if( os_strcmp( web_server_reasons[i], reasonBuf ) == 0 )
reason = (RequestReason)i;
}
if( reason == INVALID )
{
errorResponse(connData, 400, "Invalid reason!");
return HTTPD_CGI_DONE;
}
struct ArgumentBuffer argBuffer;
WEB_argInit( &argBuffer );
switch(reason)
{
case BUTTON:
{
char id_buf[40];
int id_len = httpdFindArg(connData->getArgs, "id", id_buf, sizeof(id_buf));
if( id_len <= 0 )
{
errorResponse(connData, 400, "No button ID specified!");
return HTTPD_CGI_DONE;
}
argPos[0] = body;
argNum++;
break;
case SUBMIT:
if( WEB_addArg(&argBuffer, id_buf, id_len) )
{
if( connData->post->received < connData->post->len )
errorResponse(connData, 400, "Post too large!");
return HTTPD_CGI_DONE;
}
}
break;
case SUBMIT:
{
if( connData->post->received < connData->post->len )
{
errorResponse(connData, 400, "Post too large!");
return HTTPD_CGI_DONE;
}
int bptr = 0;
while( bptr < connData->post->len )
{
char * line = connData->post->buff + bptr;
char * eo = os_strchr(line, '&' );
if( eo != NULL )
{
errorResponse(connData, 400, "Post too large!");
return HTTPD_CGI_DONE;
*eo = 0;
bptr = eo - connData->post->buff + 1;
}
else
{
eo = line + os_strlen( line );
bptr = connData->post->len;
}
int bptr = 0;
int len = os_strlen(line);
while( len >= 1 && ( line[len-1] == '\r' || line[len-1] == '\n' ))
len--;
line[len] = 0;
while( bptr < connData->post->len )
char * val = os_strchr(line, '=');
if( val != NULL )
{
if( argNum >= MAX_VARS )
{
errorResponse(connData, 400, "Too many variables!");
return HTTPD_CGI_DONE;
}
*val = 0;
char * name = line;
int vblen = os_strlen(val+1) * 2;
char value[vblen];
httpdUrlDecode(val+1, strlen(val+1), value, vblen);
char * line = connData->post->buff + bptr;
int namLen = os_strlen(name);
int valLen = os_strlen(value);
char * eo = os_strchr(line, '&' );
if( eo != NULL )
{
*eo = 0;
bptr = eo - connData->post->buff + 1;
}
else
{
eo = line + os_strlen( line );
bptr = connData->post->len;
}
int len = os_strlen(line);
while( len >= 1 && ( line[len-1] == '\r' || line[len-1] == '\n' ))
len--;
line[len] = 0;
char arg[namLen + valLen + 3];
int argPtr = 0;
arg[argPtr++] = (char)WEB_STRING;
os_strcpy( arg + argPtr, name );
argPtr += namLen;
arg[argPtr++] = 0;
os_strcpy( arg + argPtr, value );
argPtr += valLen;
char * val = os_strchr(line, '=');
if( val != NULL )
if( WEB_addArg(&argBuffer, arg, argPtr) )
{
*val = 0;
char * name = line;
int vblen = os_strlen(val+1) * 2;
char value[vblen];
httpdUrlDecode(val+1, strlen(val+1), value, vblen);
int namLen = os_strlen(name);
int valLen = os_strlen(value);
int totallen = namLen + valLen + 2;
if( bodyPtr + totallen > sizeof(body) - 10 )
{
errorResponse(connData, 400, "Post too large!");
return HTTPD_CGI_DONE;
}
argPos[argNum] = body + bodyPtr;
body[bodyPtr++] = (char)WEB_STRING;
os_strcpy( body + bodyPtr, name );
bodyPtr += namLen;
body[bodyPtr++] = 0;
os_strcpy( body + bodyPtr, value );
bodyPtr += valLen;
argLen[argNum++] = totallen;
errorResponse(connData, 400, "Post too large!");
return HTTPD_CGI_DONE;
}
}
}
break;
case LOAD:
case REFRESH:
default:
break;
}
}
break;
case LOAD:
case REFRESH:
default:
break;
}
if( WEB_addArg(&argBuffer, NULL, 0) )
{
errorResponse(connData, 400, "Post too large!");
return HTTPD_CGI_DONE;
}
os_printf("Web callback to MCU: %s\n", reasonBuf);
WEB_sendArgBuffer(&argBuffer, connData, (uint32_t)cb->callback, reason );
if( reason == SUBMIT )
{
httpdStartResponse(connData, 204);
httpdEndHeaders(connData);
return HTTPD_CGI_DONE;
}
return HTTPD_CGI_MORE;
}
// this method receives SLIP data from MCU sends JSON to the browser
static int ICACHE_FLASH_ATTR WEB_handleMCUResponse(HttpdConnData *connData, CmdRequest * response)
{
char jsonBuf[1500];
int jsonPtr = 0;
jsonBuf[jsonPtr++] = '{';
int c = 2;
while( c++ < cmdGetArgc(response) )
{
int len = cmdArgLen(response);
char buf[len+1];
buf[len] = 0;
os_printf("Web callback to MCU: %s\n", reasonBuf);
cmdPopArg(response, buf, len);
cmdResponseStart(CMD_WEB_REQ_CB, (uint32_t)cb->callback, 4 + argNum);
uint16_t r = (uint16_t)reason;
cmdResponseBody(&r, sizeof(uint16_t));
cmdResponseBody(&connData->conn->proto.tcp->remote_ip, 4);
cmdResponseBody(&connData->conn->proto.tcp->remote_port, sizeof(uint16_t));
cmdResponseBody(connData->url, os_strlen(connData->url));
if(len == 0)
break; // last argument
int j;
for( j=0; j < argNum; j++ )
cmdResponseBody(argPos[j], argLen[j]);
if( c > 3 ) // skip the first argument
jsonBuf[jsonPtr++] = ',';
cmdResponseEnd();
if( reason == SUBMIT )
if( jsonPtr + 20 + len > sizeof(jsonBuf) )
{
httpdStartResponse(connData, 204);
httpdEndHeaders(connData);
errorResponse(connData, 500, "Response too large!");
return HTTPD_CGI_DONE;
}
connData->cgiData = (void *)1;
}
if( connData->cgiResponse != NULL ) // data from MCU
{
char jsonBuf[1500];
int jsonPtr = 0;
WebValueType type = (WebValueType)buf[0];
int nameLen = os_strlen(buf+1);
jsonBuf[jsonPtr++] = '"';
os_memcpy(jsonBuf + jsonPtr, buf + 1, nameLen);
jsonPtr += nameLen;
jsonBuf[jsonPtr++] = '"';
jsonBuf[jsonPtr++] = ':';
jsonBuf[jsonPtr++] = '{';
CmdRequest * req = (CmdRequest *)(connData->cgiResponse);
char * value = buf + 2 + nameLen;
int c = 2;
while( c++ < cmdGetArgc(req) )
switch(type)
{
int len = cmdArgLen(req);
char buf[len+1];
buf[len] = 0;
cmdPopArg(req, buf, len);
if(len == 0)
break; // last argument
if( c > 3 ) // skip the first argument
jsonBuf[jsonPtr++] = ',';
if( jsonPtr + 20 + len > sizeof(jsonBuf) )
{
errorResponse(connData, 500, "Response too large!");
return HTTPD_CGI_DONE;
}
WebValueType type = (WebValueType)buf[0];
int nameLen = os_strlen(buf+1);
jsonBuf[jsonPtr++] = '"';
os_memcpy(jsonBuf + jsonPtr, buf + 1, nameLen);
jsonPtr += nameLen;
jsonBuf[jsonPtr++] = '"';
jsonBuf[jsonPtr++] = ':';
char * value = buf + 2 + nameLen;
switch(type)
{
case WEB_NULL:
os_memcpy(jsonBuf + jsonPtr, "null", 4);
case WEB_NULL:
os_memcpy(jsonBuf + jsonPtr, "null", 4);
jsonPtr += 4;
break;
case WEB_INTEGER:
{
int v;
os_memcpy( &v, value, 4);
char intbuf[20];
os_sprintf(intbuf, "%d", v);
os_strcpy(jsonBuf + jsonPtr, intbuf);
jsonPtr += os_strlen(intbuf);
}
break;
case WEB_BOOLEAN:
if( *value ) {
os_memcpy(jsonBuf + jsonPtr, "true", 4);
jsonPtr += 4;
break;
case WEB_INTEGER:
{
int v;
os_memcpy( &v, value, 4);
char intbuf[20];
os_sprintf(intbuf, "%d", v);
os_strcpy(jsonBuf + jsonPtr, intbuf);
jsonPtr += os_strlen(intbuf);
}
break;
case WEB_BOOLEAN:
if( *value ) {
os_memcpy(jsonBuf + jsonPtr, "true", 4);
jsonPtr += 4;
} else {
os_memcpy(jsonBuf + jsonPtr, "false", 5);
jsonPtr += 5;
}
break;
case WEB_FLOAT:
{
float f;
os_memcpy( &f, value, 4);
char intbuf[20];
os_sprintf(intbuf, "%f", f);
os_strcpy(jsonBuf + jsonPtr, intbuf);
jsonPtr += os_strlen(intbuf);
}
break;
case WEB_STRING:
jsonBuf[jsonPtr++] = '"';
while(*value)
{
if( *value == '\\' || *value == '"' )
jsonBuf[jsonPtr++] = '\\';
jsonBuf[jsonPtr++] = *(value++);
}
jsonBuf[jsonPtr++] = '"';
break;
case WEB_JSON:
os_memcpy(jsonBuf + jsonPtr, value, len - 2 - nameLen);
jsonPtr += len - 2 - nameLen;
break;
}
} else {
os_memcpy(jsonBuf + jsonPtr, "false", 5);
jsonPtr += 5;
}
break;
case WEB_FLOAT:
{
float f;
os_memcpy( &f, value, 4);
char intbuf[20];
os_sprintf(intbuf, "%f", f);
os_strcpy(jsonBuf + jsonPtr, intbuf);
jsonPtr += os_strlen(intbuf);
}
break;
case WEB_STRING:
jsonBuf[jsonPtr++] = '"';
while(*value)
{
if( *value == '\\' || *value == '"' )
jsonBuf[jsonPtr++] = '\\';
jsonBuf[jsonPtr++] = *(value++);
}
jsonBuf[jsonPtr++] = '"';
break;
case WEB_JSON:
os_memcpy(jsonBuf + jsonPtr, value, len - 2 - nameLen);
jsonPtr += len - 2 - nameLen;
break;
}
jsonBuf[jsonPtr++] = '}';
noCacheHeaders(connData, 200);
httpdHeader(connData, "Content-Type", "application/json");
char cl[16];
os_sprintf(cl, "%d", jsonPtr);
httpdHeader(connData, "Content-Length", cl);
httpdEndHeaders(connData);
httpdSend(connData, jsonBuf, jsonPtr);
return HTTPD_CGI_DONE;
}
jsonBuf[jsonPtr++] = '}';
noCacheHeaders(connData, 200);
httpdHeader(connData, "Content-Type", "application/json");
char cl[16];
os_sprintf(cl, "%d", jsonPtr);
httpdHeader(connData, "Content-Length", cl);
httpdEndHeaders(connData);
httpdSend(connData, jsonBuf, jsonPtr);
return HTTPD_CGI_DONE;
}
// this method is responsible for the MCU <==JSON==> Browser communication
int ICACHE_FLASH_ATTR WEB_CgiJsonHook(HttpdConnData *connData)
{
if (connData->conn==NULL) return HTTPD_CGI_DONE; // Connection aborted. Clean up.
void * cgiData = connData->cgiData;
if( cgiData == NULL )
{
connData->cgiData = (void *)1; // indicate, that request was processed
return WEB_handleJSONRequest(connData);
}
if( connData->cgiResponse != NULL ) // data from MCU
return WEB_handleMCUResponse(connData, (CmdRequest *)(connData->cgiResponse));
return HTTPD_CGI_MORE;
}
// this method is called when MCU transmits WEB_DATA command
void ICACHE_FLASH_ATTR WEB_Data(CmdPacket *cmd)
{
CmdRequest req;
@ -373,14 +441,14 @@ void ICACHE_FLASH_ATTR WEB_Data(CmdPacket *cmd)
if (cmdGetArgc(&req) < 2) return;
uint8_t ip[4];
cmdPopArg(&req, ip, 4);
cmdPopArg(&req, ip, 4); // pop the IP address
uint16_t port;
cmdPopArg(&req, &port, 2);
cmdPopArg(&req, &port, 2); // pop the HTTP port
HttpdConnData * conn = httpdLookUpConn(ip, port);
if( conn != NULL && conn->cgi == WEB_CgiJsonHook ) // make sure that the right CGI handler will be called
HttpdConnData * conn = httpdLookUpConn(ip, port); // look up connection based on IP/port
if( conn != NULL && conn->cgi == WEB_CgiJsonHook ) // make sure that the right CGI handler is configured
httpdSetCGIResponse( conn, &req );
else
os_printf("WEB response ignored as no valid http connection found for the request!\n");
os_printf("WEB_DATA ignored as no valid HTTP connection found!\n");
}

20
web-server/web-server.h
Unescape View File

@ -8,22 +8,22 @@
typedef enum
{
LOAD=0,
REFRESH,
BUTTON,
SUBMIT,
LOAD=0, // loading web-page content at the first time
REFRESH, // loading web-page subsequently
BUTTON, // HTML button pressed
SUBMIT, // HTML form is submitted
INVALID=-1,
} RequestReason;
typedef enum
{
WEB_STRING=0,
WEB_NULL,
WEB_INTEGER,
WEB_BOOLEAN,
WEB_FLOAT,
WEB_JSON
WEB_STRING=0, // the value is string
WEB_NULL, // the value is NULL
WEB_INTEGER, // the value is integer
WEB_BOOLEAN, // the value is boolean
WEB_FLOAT, // the value is float
WEB_JSON // the value is JSON data
} WebValueType;
void WEB_Init();

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