Jeroen Domburg
8 years ago
parent
205db7c2da
commit
974e1d4ba0
@ -1 +1 @@ |
||||
Subproject commit bca6680983172609537e5cb9a542a5c63af3d489 |
||||
Subproject commit ef76587040b8fde3e36a01dcad889ce44a6ac354 |
||||
@ -1,112 +0,0 @@ |
||||
# Intro to esphttpd developement # |
||||
|
||||
(Thanks to escardin, who wrote this.) |
||||
|
||||
|
||||
user_main.c and cgi.c provide good examples of setting up the webserver, processing input and output. |
||||
|
||||
## Setting up httpd ## |
||||
You need to define a list of urls and callbacks for those urls for processing input and transforming output. |
||||
At minimum, it must end with a NULL url. |
||||
The list is processed top to bottom, so it is best if wildcards are handled at the bottom. |
||||
Example: |
||||
HttpdBuiltInUrl builtInUrls[]={ |
||||
{"/", cgiRedirect, "/index.tpl"}, |
||||
{"/led.tpl", cgiEspFsTemplate, tplLed}, |
||||
{"/index.tpl", cgiEspFsTemplate, tplCounter}, |
||||
{"/led.cgi", cgiLed, NULL}, |
||||
{"*", cgiEspFsHook, NULL}, //Catch-all cgi function for the filesystem |
||||
{NULL, NULL, NULL} |
||||
}; |
||||
|
||||
The contents of each field is explained in URLs, CGI Callback and TPL Callback further down. |
||||
|
||||
If you plan on using serial logging, you need to include stdout.c & stdout.h and call stdoutInit() before starting the httpd. |
||||
|
||||
If you plan on serving up any templates or files, you need to call espFsInit. It is recommended to just place the following code unless you know what you're doing: |
||||
|
||||
// 0x40200000 is the base address for spi flash memory mapping, ESPFS_POS is the position |
||||
// where image is written in flash that is defined in Makefile. |
||||
#ifdef ESPFS_POS |
||||
espFsInit((void*)(0x40200000 + ESPFS_POS)); |
||||
#else |
||||
espFsInit((void*)(webpages_espfs_start)); |
||||
#endif |
||||
|
||||
You should now call any other initialization routines you may need. |
||||
|
||||
Now, call httpdInit() with the list of urls you created earlier and the port you wish httpd to listen on. |
||||
|
||||
## URLs ## |
||||
Urls are relative to the url root and must begin with a /, unless they are *. |
||||
A * is a wildcard and will match anything from the * onwards. |
||||
The * MUST be the last character in the url pattern to be a wildcard! |
||||
Examples: |
||||
'*' will match: '/', '/stuff', 'things', '/widgets.tpl' |
||||
'/stuff*' will match: '/stuff', '/stuff/', '/stuff/widgets.tpl', '/stuff.html' |
||||
|
||||
## CGI Callback ## |
||||
The specified cgi callback is called when the url it is tied to matches. |
||||
It is passed a pointer to the connection (HttpdConnData). |
||||
It returns one of HTTPD_CGI_MORE, HTTPD_CGI_DONE, HTTPD_CGI_NOTFOUND, HTTPD_CGI_AUTHENTICATED. If one of these is not returned, it will retry this url again (probably infinitely). |
||||
HTTPD_CGI_MORE means it has handled the request, but is not done sending data yet. |
||||
HTTPD_CGI_DONE means it has handled the request and is done sending data. |
||||
HTTPD_CGI_NOTFOUND and HTTPD_CGI_AUTHENTICATED means that it has not handled the request, and the url matching should continue with the next entry. |
||||
|
||||
## TPL Callback ## |
||||
The specified tpl callback is called for every token in the calling tpl file, as well as when the connection is aborted (token will be null). |
||||
It is passed a pointer to the connection data (HttpdConnData), a string token, and arguments. |
||||
If token is null, assume that the connection has died and it is time to clean up. |
||||
A token is the contents between two %. I.e. %ledstate% or %counter%. |
||||
It is the responisbility of the callback to write what should replace the token using httpdSend(); |
||||
The TPL Callback is only used (so far) if you set the CGI Callback to 'cgiEspFsTemplate'. |
||||
The return callback for TPL is not currently used, and should return one of HTTPD_CGI_MORE, HTTPD_CGI_DONE, HTTPD_CGI_NOTFOUND, HTTPD_CGI_AUTHENTICATED, though the use of each value is undefined at this time. |
||||
|
||||
## USEFUL BUILTIN FUNCTIONS ## |
||||
|
||||
base64_decode (base64.h): TODO describe how to use this |
||||
|
||||
captdnsInit (captdns.h): |
||||
- Creates a captive dns portal listening on the default ap network |
||||
|
||||
Serving files: |
||||
- espFsInit (espfs.h): Initializes access to the espfs block of flash. See above for basic usage, not recommended to mess around. |
||||
- espFsFlags (espfs.h): returns the flags for an opened file |
||||
- espFsRead (espfs.h): Read len bytes from file into buffer. Returns actual number of bytes read |
||||
- espFsClose (espfs.h): Close the file |
||||
- espFsOpen (espfs.h): open a file and return the file handle |
||||
|
||||
CGI Callbacks |
||||
- cgiEspFsHook (httpdespfs.h): attempts to read out the requested file as is (no template processing) |
||||
- cgiEspFsTemplate (httpdespfs.h): attempts to read out the requested file, with template processing (using the cgiArg tpl callback) |
||||
- cgiRedirect (httpd.h): Redirect to the url specified as a cgiArg (string) |
||||
- cgiRedirectToHostname (httpd.h): Redirect to the given http url, if it doesn't match the request url |
||||
- cgiRedirectApClientToHostname (httpd.h): Same as cgiRedirectToHostname, but only redirects if in the AP ip range |
||||
- authBasic (auth.h): performs http basic auth from the cgiArg callback function |
||||
- int cgiArg(HttpdConnData connData, int userIndex,char *userOut,int userOutLength, char *passOut,int passOutLength) |
||||
- return 1 if an entry at userIndex was found (with the username and password in userOut and passOut respectively) |
||||
- return 0 if no entry at userIndex was found (will cause authBasic to stop processing) |
||||
- OTA Firmware Updating |
||||
- cgiReadFlash (cgiflash.h): returns the first 512Kbyte of firmware |
||||
- cgiGetFirmwareNext (cgiflash.h): Returns which firmware should be uploaded next |
||||
- cgiUploadFirmware (cgiflash.h): replace firmware with POSTed firmware, after some basic validation |
||||
- cgiRebootFirmware (cgiflash.h): reboot after firmware finishes uploading? |
||||
- OTA Wifi Setup |
||||
- cgiWiFiScan (cgiwifi.h): Initiate a scan for wifi access points, and return the status/result as JSON |
||||
- tplWlan (cgiwifi.h): Template processor for the httpd demo template page |
||||
- cgiWiFi (cgiwifi.h): not implemented? |
||||
- cgiWiFiConnect (cgiwifi.h): Connect to the specified essid using the passwd provided |
||||
- cgiWiFiSetMode (cgiwifi.h): Set the esp8266 wifi mode (AP, Station, AP+Station) and reboot |
||||
- cgiWiFiConnStatus (cgiwifi.h): Return the station connection status as JSON |
||||
|
||||
Working with HTTP |
||||
- httpdRedirect (httpd.h): issue a 302 redirect to the given url |
||||
- httpdUrlDecode (httpd.h): decodes a percent encoded url |
||||
- httpdFindArg (httpd.h): finds the specified argument in the get or post data, and returns the percent decoded version of it |
||||
- httpdInit (httpd.h): Starts an http server on the given port for the given urls |
||||
- httpdGetMimetype (httpd.h): returns the mimetype based on the url extension |
||||
- httpdStartResponse (httpd.h): start http response (must be called first, and only once) |
||||
- httpdHeader (httpd.h): sends a particular http response header |
||||
- httpdEndHeaders (httpd.h): completes sending headers (no more headers may be sent) |
||||
- httpdGetHeader (httpd.h): retrieves a specific request header |
||||
- httpdSend (httpd.h): add data to be sent to the user, returns 1 for success, 0 for out of memory |
||||
Loading…
Reference in new issue