mirror of
https://github.com/espressif/esp-idf.git
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9a9d18e466
* http_sess_set_*_override APIs are now the only ones available to set custom recv/send/pending functions * Fixed side effects to using http_sess_set/get_context inside URI handlers
1189 lines
45 KiB
C
1189 lines
45 KiB
C
// Copyright 2018 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef _ESP_HTTP_SERVER_H_
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#define _ESP_HTTP_SERVER_H_
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#include <stdio.h>
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#include <string.h>
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#include <freertos/FreeRTOS.h>
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#include <freertos/task.h>
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#include <http_parser.h>
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#include <sdkconfig.h>
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#include <esp_err.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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note: esp_https_server.h includes a customized copy of this
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initializer that should be kept in sync
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*/
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#define HTTPD_DEFAULT_CONFIG() { \
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.task_priority = tskIDLE_PRIORITY+5, \
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.stack_size = 4096, \
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.server_port = 80, \
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.ctrl_port = 32768, \
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.max_open_sockets = 7, \
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.max_uri_handlers = 8, \
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.max_resp_headers = 8, \
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.backlog_conn = 5, \
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.lru_purge_enable = false, \
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.recv_wait_timeout = 5, \
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.send_wait_timeout = 5, \
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.global_user_ctx = NULL, \
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.global_user_ctx_free_fn = NULL, \
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.global_transport_ctx = NULL, \
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.global_transport_ctx_free_fn = NULL, \
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.open_fn = NULL, \
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.close_fn = NULL, \
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}
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#define ESP_ERR_HTTPD_BASE (0x8000) /*!< Starting number of HTTPD error codes */
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#define ESP_ERR_HTTPD_HANDLERS_FULL (ESP_ERR_HTTPD_BASE + 1) /*!< All slots for registering URI handlers have been consumed */
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#define ESP_ERR_HTTPD_HANDLER_EXISTS (ESP_ERR_HTTPD_BASE + 2) /*!< URI handler with same method and target URI already registered */
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#define ESP_ERR_HTTPD_INVALID_REQ (ESP_ERR_HTTPD_BASE + 3) /*!< Invalid request pointer */
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#define ESP_ERR_HTTPD_RESULT_TRUNC (ESP_ERR_HTTPD_BASE + 4) /*!< Result string truncated */
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#define ESP_ERR_HTTPD_RESP_HDR (ESP_ERR_HTTPD_BASE + 5) /*!< Response header field larger than supported */
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#define ESP_ERR_HTTPD_RESP_SEND (ESP_ERR_HTTPD_BASE + 6) /*!< Error occured while sending response packet */
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#define ESP_ERR_HTTPD_ALLOC_MEM (ESP_ERR_HTTPD_BASE + 7) /*!< Failed to dynamically allocate memory for resource */
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#define ESP_ERR_HTTPD_TASK (ESP_ERR_HTTPD_BASE + 8) /*!< Failed to launch server task/thread */
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/* ************** Group: Initialization ************** */
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/** @name Initialization
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* APIs related to the Initialization of the web server
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* @{
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*/
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/**
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* @brief HTTP Server Instance Handle
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*
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* Every instance of the server will have a unique handle.
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*/
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typedef void* httpd_handle_t;
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/**
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* @brief HTTP Method Type wrapper over "enum http_method"
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* available in "http_parser" library
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*/
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typedef enum http_method httpd_method_t;
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/**
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* @brief Prototype for freeing context data (if any)
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* @param[in] ctx : object to free
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*/
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typedef void (*httpd_free_ctx_fn_t)(void *ctx);
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/**
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* @brief Function prototype for opening a session.
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*
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* Called immediately after the socket was opened to set up the send/recv functions and
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* other parameters of the socket.
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*
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* @param[in] hd : server instance
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* @param[in] sockfd : session socket file descriptor
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* @return status
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*/
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typedef esp_err_t (*httpd_open_func_t)(httpd_handle_t hd, int sockfd);
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/**
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* @brief Function prototype for closing a session.
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*
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* @note It's possible that the socket descriptor is invalid at this point, the function
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* is called for all terminated sessions. Ensure proper handling of return codes.
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*
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* @param[in] hd : server instance
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* @param[in] sockfd : session socket file descriptor
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*/
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typedef void (*httpd_close_func_t)(httpd_handle_t hd, int sockfd);
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/**
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* @brief HTTP Server Configuration Structure
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*
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* @note Use HTTPD_DEFAULT_CONFIG() to initialize the configuration
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* to a default value and then modify only those fields that are
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* specifically determined by the use case.
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*/
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typedef struct httpd_config {
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unsigned task_priority; /*!< Priority of FreeRTOS task which runs the server */
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size_t stack_size; /*!< The maximum stack size allowed for the server task */
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/**
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* TCP Port number for receiving and transmitting HTTP traffic
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*/
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uint16_t server_port;
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/**
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* UDP Port number for asynchronously exchanging control signals
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* between various components of the server
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*/
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uint16_t ctrl_port;
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uint16_t max_open_sockets; /*!< Max number of sockets/clients connected at any time*/
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uint16_t max_uri_handlers; /*!< Maximum allowed uri handlers */
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uint16_t max_resp_headers; /*!< Maximum allowed additional headers in HTTP response */
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uint16_t backlog_conn; /*!< Number of backlog connections */
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bool lru_purge_enable; /*!< Purge "Least Recently Used" connection */
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uint16_t recv_wait_timeout; /*!< Timeout for recv function (in seconds)*/
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uint16_t send_wait_timeout; /*!< Timeout for send function (in seconds)*/
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/**
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* Global user context.
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*
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* This field can be used to store arbitrary user data within the server context.
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* The value can be retrieved using the server handle, available e.g. in the httpd_req_t struct.
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*
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* When shutting down, the server frees up the user context by
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* calling free() on the global_user_ctx field. If you wish to use a custom
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* function for freeing the global user context, please specify that here.
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*/
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void * global_user_ctx;
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/**
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* Free function for global user context
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*/
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httpd_free_ctx_fn_t global_user_ctx_free_fn;
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/**
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* Global transport context.
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*
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* Similar to global_user_ctx, but used for session encoding or encryption (e.g. to hold the SSL context).
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* It will be freed using free(), unless global_transport_ctx_free_fn is specified.
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*/
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void * global_transport_ctx;
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/**
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* Free function for global transport context
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*/
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httpd_free_ctx_fn_t global_transport_ctx_free_fn;
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/**
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* Custom session opening callback.
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*
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* Called on a new session socket just after accept(), but before reading any data.
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*
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* This is an opportunity to set up e.g. SSL encryption using global_transport_ctx
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* and the send/recv/pending session overrides.
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*
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* If a context needs to be maintained between these functions, store it in the session using
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* httpd_sess_set_transport_ctx() and retrieve it later with httpd_sess_get_transport_ctx()
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*/
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httpd_open_func_t open_fn;
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/**
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* Custom session closing callback.
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*
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* Called when a session is deleted, before freeing user and transport contexts and before
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* closing the socket. This is a place for custom de-init code common to all sockets.
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*
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* Set the user or transport context to NULL if it was freed here, so the server does not
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* try to free it again.
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*
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* This function is run for all terminated sessions, including sessions where the socket
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* was closed by the network stack - that is, the file descriptor may not be valid anymore.
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*/
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httpd_close_func_t close_fn;
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} httpd_config_t;
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/**
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* @brief Starts the web server
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*
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* Create an instance of HTTP server and allocate memory/resources for it
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* depending upon the specified configuration.
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*
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* Example usage:
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* @code{c}
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*
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* //Function for starting the webserver
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* httpd_handle_t start_webserver(void)
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* {
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* // Generate default configuration
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* httpd_config_t config = HTTPD_DEFAULT_CONFIG();
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*
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* // Empty handle to http_server
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* httpd_handle_t server = NULL;
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*
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* // Start the httpd server
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* if (httpd_start(&server, &config) == ESP_OK) {
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* // Register URI handlers
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* httpd_register_uri_handler(server, &uri_get);
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* httpd_register_uri_handler(server, &uri_post);
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* }
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* // If server failed to start, handle will be NULL
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* return server;
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* }
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*
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* @endcode
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*
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* @param[in] config : Configuration for new instance of the server
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* @param[out] handle : Handle to newly created instance of the server. NULL on error
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* @return
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* - ESP_OK : Instance created successfully
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* - ESP_ERR_INVALID_ARG : Null argument(s)
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* - ESP_ERR_HTTPD_ALLOC_MEM : Failed to allocate memory for instance
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* - ESP_ERR_HTTPD_TASK : Failed to launch server task
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*/
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esp_err_t httpd_start(httpd_handle_t *handle, const httpd_config_t *config);
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/**
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* @brief Stops the web server
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*
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* Deallocates memory/resources used by an HTTP server instance and
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* deletes it. Once deleted the handle can no longer be used for accessing
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* the instance.
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*
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* Example usage:
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* @code{c}
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*
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* // Function for stopping the webserver
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* void stop_webserver(httpd_handle_t server)
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* {
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* // Ensure handle is non NULL
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* if (server != NULL) {
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* // Stop the httpd server
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* httpd_stop(server);
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* }
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* }
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*
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* @endcode
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*
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* @param[in] handle Handle to server returned by httpd_start
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* @return
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* - ESP_OK : Server stopped successfully
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* - ESP_ERR_INVALID_ARG : Handle argument is Null
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*/
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esp_err_t httpd_stop(httpd_handle_t handle);
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/** End of Group Initialization
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* @}
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*/
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/* ************** Group: URI Handlers ************** */
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/** @name URI Handlers
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* APIs related to the URI handlers
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* @{
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*/
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/* Max supported HTTP request header length */
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#define HTTPD_MAX_REQ_HDR_LEN CONFIG_HTTPD_MAX_REQ_HDR_LEN
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/* Max supported HTTP request URI length */
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#define HTTPD_MAX_URI_LEN CONFIG_HTTPD_MAX_URI_LEN
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/**
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* @brief HTTP Request Data Structure
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*/
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typedef struct httpd_req {
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httpd_handle_t handle; /*!< Handle to server instance */
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int method; /*!< The type of HTTP request, -1 if unsupported method */
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const char uri[HTTPD_MAX_URI_LEN + 1]; /*!< The URI of this request (1 byte extra for null termination) */
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size_t content_len; /*!< Length of the request body */
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void *aux; /*!< Internally used members */
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/**
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* User context pointer passed during URI registration.
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*/
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void *user_ctx;
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/**
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* Session Context Pointer
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*
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* A session context. Contexts are maintained across 'sessions' for a
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* given open TCP connection. One session could have multiple request
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* responses. The web server will ensure that the context persists
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* across all these request and responses.
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*
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* By default, this is NULL. URI Handlers can set this to any meaningful
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* value.
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*
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* If the underlying socket gets closed, and this pointer is non-NULL,
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* the web server will free up the context by calling free(), unless
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* free_ctx function is set.
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*/
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void *sess_ctx;
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/**
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* Pointer to free context hook
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*
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* Function to free session context
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*
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* If the web server's socket closes, it frees up the session context by
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* calling free() on the sess_ctx member. If you wish to use a custom
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* function for freeing the session context, please specify that here.
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*/
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httpd_free_ctx_fn_t free_ctx;
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} httpd_req_t;
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/**
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* @brief Structure for URI handler
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*/
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typedef struct httpd_uri {
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const char *uri; /*!< The URI to handle */
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httpd_method_t method; /*!< Method supported by the URI */
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/**
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* Handler to call for supported request method. This must
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* return ESP_OK, or else the underlying socket will be closed.
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*/
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esp_err_t (*handler)(httpd_req_t *r);
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/**
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* Pointer to user context data which will be available to handler
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*/
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void *user_ctx;
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} httpd_uri_t;
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/**
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* @brief Registers a URI handler
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*
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* @note URI handlers can be registered in real time as long as the
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* server handle is valid.
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*
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* Example usage:
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* @code{c}
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*
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* esp_err_t my_uri_handler(httpd_req_t* req)
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* {
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* // Recv , Process and Send
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* ....
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* ....
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* ....
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*
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* // Fail condition
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* if (....) {
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* // Return fail to close session //
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* return ESP_FAIL;
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* }
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*
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* // On success
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* return ESP_OK;
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* }
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*
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* // URI handler structure
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* httpd_uri_t my_uri {
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* .uri = "/my_uri/path/xyz",
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* .method = HTTPD_GET,
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* .handler = my_uri_handler,
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* .user_ctx = NULL
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* };
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*
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* // Register handler
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* if (httpd_register_uri_handler(server_handle, &my_uri) != ESP_OK) {
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* // If failed to register handler
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* ....
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* }
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*
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* @endcode
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*
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* @param[in] handle handle to HTTPD server instance
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* @param[in] uri_handler pointer to handler that needs to be registered
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*
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* @return
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* - ESP_OK : On successfully registering the handler
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* - ESP_ERR_INVALID_ARG : Null arguments
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* - ESP_ERR_HTTPD_HANDLERS_FULL : If no slots left for new handler
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* - ESP_ERR_HTTPD_HANDLER_EXISTS : If handler with same URI and
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* method is already registered
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*/
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esp_err_t httpd_register_uri_handler(httpd_handle_t handle,
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const httpd_uri_t *uri_handler);
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/**
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* @brief Unregister a URI handler
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*
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* @param[in] handle handle to HTTPD server instance
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* @param[in] uri URI string
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* @param[in] method HTTP method
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*
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* @return
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* - ESP_OK : On successfully deregistering the handler
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* - ESP_ERR_INVALID_ARG : Null arguments
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* - ESP_ERR_NOT_FOUND : Handler with specified URI and method not found
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*/
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esp_err_t httpd_unregister_uri_handler(httpd_handle_t handle,
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const char *uri, httpd_method_t method);
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/**
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* @brief Unregister all URI handlers with the specified uri string
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*
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* @param[in] handle handle to HTTPD server instance
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* @param[in] uri uri string specifying all handlers that need
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* to be deregisterd
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*
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* @return
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* - ESP_OK : On successfully deregistering all such handlers
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* - ESP_ERR_INVALID_ARG : Null arguments
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* - ESP_ERR_NOT_FOUND : No handler registered with specified uri string
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*/
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esp_err_t httpd_unregister_uri(httpd_handle_t handle, const char* uri);
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/** End of URI Handlers
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* @}
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*/
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/* ************** Group: TX/RX ************** */
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/** @name TX / RX
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* Prototype for HTTPDs low-level send/recv functions
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* @{
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*/
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#define HTTPD_SOCK_ERR_FAIL -1
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#define HTTPD_SOCK_ERR_INVALID -2
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#define HTTPD_SOCK_ERR_TIMEOUT -3
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/**
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* @brief Prototype for HTTPDs low-level send function
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*
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* @note User specified send function must handle errors internally,
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* depending upon the set value of errno, and return specific
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* HTTPD_SOCK_ERR_ codes, which will eventually be conveyed as
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* return value of httpd_send() function
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*
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* @param[in] hd : server instance
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* @param[in] sockfd : session socket file descriptor
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* @param[in] buf : buffer with bytes to send
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* @param[in] buf_len : data size
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* @param[in] flags : flags for the send() function
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* @return
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* - Bytes : The number of bytes sent successfully
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* - HTTPD_SOCK_ERR_INVALID : Invalid arguments
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* - HTTPD_SOCK_ERR_TIMEOUT : Timeout/interrupted while calling socket send()
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* - HTTPD_SOCK_ERR_FAIL : Unrecoverable error while calling socket send()
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*/
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typedef int (*httpd_send_func_t)(httpd_handle_t hd, int sockfd, const char *buf, size_t buf_len, int flags);
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/**
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* @brief Prototype for HTTPDs low-level recv function
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*
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* @note User specified recv function must handle errors internally,
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* depending upon the set value of errno, and return specific
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* HTTPD_SOCK_ERR_ codes, which will eventually be conveyed as
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* return value of httpd_req_recv() function
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*
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* @param[in] hd : server instance
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* @param[in] sockfd : session socket file descriptor
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* @param[in] buf : buffer with bytes to send
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* @param[in] buf_len : data size
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* @param[in] flags : flags for the send() function
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* @return
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* - Bytes : The number of bytes received successfully
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* - 0 : Buffer length parameter is zero / connection closed by peer
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* - HTTPD_SOCK_ERR_INVALID : Invalid arguments
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* - HTTPD_SOCK_ERR_TIMEOUT : Timeout/interrupted while calling socket recv()
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* - HTTPD_SOCK_ERR_FAIL : Unrecoverable error while calling socket recv()
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*/
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typedef int (*httpd_recv_func_t)(httpd_handle_t hd, int sockfd, char *buf, size_t buf_len, int flags);
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/**
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* @brief Prototype for HTTPDs low-level "get pending bytes" function
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*
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* @note User specified pending function must handle errors internally,
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* depending upon the set value of errno, and return specific
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|
* HTTPD_SOCK_ERR_ codes, which will be handled accordingly in
|
|
* the server task.
|
|
*
|
|
* @param[in] hd : server instance
|
|
* @param[in] sockfd : session socket file descriptor
|
|
* @return
|
|
* - Bytes : The number of bytes waiting to be received
|
|
* - HTTPD_SOCK_ERR_INVALID : Invalid arguments
|
|
* - HTTPD_SOCK_ERR_TIMEOUT : Timeout/interrupted while calling socket pending()
|
|
* - HTTPD_SOCK_ERR_FAIL : Unrecoverable error while calling socket pending()
|
|
*/
|
|
typedef int (*httpd_pending_func_t)(httpd_handle_t hd, int sockfd);
|
|
|
|
/** End of TX / RX
|
|
* @}
|
|
*/
|
|
|
|
/* ************** Group: Request/Response ************** */
|
|
/** @name Request / Response
|
|
* APIs related to the data send/receive by URI handlers.
|
|
* These APIs are supposed to be called only from the context of
|
|
* a URI handler where httpd_req_t* request pointer is valid.
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* @brief Override web server's receive function (by session FD)
|
|
*
|
|
* This function overrides the web server's receive function. This same function is
|
|
* used to read HTTP request packets.
|
|
*
|
|
* @note This API is supposed to be called either from the context of
|
|
* - an http session APIs where sockfd is a valid parameter
|
|
* - a URI handler where sockfd is obtained using httpd_req_to_sockfd()
|
|
*
|
|
* @param[in] hd HTTPD instance handle
|
|
* @param[in] sockfd Session socket FD
|
|
* @param[in] recv_func The receive function to be set for this session
|
|
*
|
|
* @return
|
|
* - ESP_OK : On successfully registering override
|
|
* - ESP_ERR_INVALID_ARG : Null arguments
|
|
*/
|
|
esp_err_t httpd_sess_set_recv_override(httpd_handle_t hd, int sockfd, httpd_recv_func_t recv_func);
|
|
|
|
/**
|
|
* @brief Override web server's send function (by session FD)
|
|
*
|
|
* This function overrides the web server's send function. This same function is
|
|
* used to send out any response to any HTTP request.
|
|
*
|
|
* @note This API is supposed to be called either from the context of
|
|
* - an http session APIs where sockfd is a valid parameter
|
|
* - a URI handler where sockfd is obtained using httpd_req_to_sockfd()
|
|
*
|
|
* @param[in] hd HTTPD instance handle
|
|
* @param[in] sockfd Session socket FD
|
|
* @param[in] send_func The send function to be set for this session
|
|
*
|
|
* @return
|
|
* - ESP_OK : On successfully registering override
|
|
* - ESP_ERR_INVALID_ARG : Null arguments
|
|
*/
|
|
esp_err_t httpd_sess_set_send_override(httpd_handle_t hd, int sockfd, httpd_send_func_t send_func);
|
|
|
|
/**
|
|
* @brief Override web server's pending function (by session FD)
|
|
*
|
|
* This function overrides the web server's pending function. This function is
|
|
* used to test for pending bytes in a socket.
|
|
*
|
|
* @note This API is supposed to be called either from the context of
|
|
* - an http session APIs where sockfd is a valid parameter
|
|
* - a URI handler where sockfd is obtained using httpd_req_to_sockfd()
|
|
*
|
|
* @param[in] hd HTTPD instance handle
|
|
* @param[in] sockfd Session socket FD
|
|
* @param[in] pending_func The receive function to be set for this session
|
|
*
|
|
* @return
|
|
* - ESP_OK : On successfully registering override
|
|
* - ESP_ERR_INVALID_ARG : Null arguments
|
|
*/
|
|
esp_err_t httpd_sess_set_pending_override(httpd_handle_t hd, int sockfd, httpd_pending_func_t pending_func);
|
|
|
|
/**
|
|
* @brief Get the Socket Descriptor from the HTTP request
|
|
*
|
|
* This API will return the socket descriptor of the session for
|
|
* which URI handler was executed on reception of HTTP request.
|
|
* This is useful when user wants to call functions that require
|
|
* session socket fd, from within a URI handler, ie. :
|
|
* httpd_sess_get_ctx(),
|
|
* httpd_sess_trigger_close(),
|
|
* httpd_sess_update_timestamp().
|
|
*
|
|
* @note This API is supposed to be called only from the context of
|
|
* a URI handler where httpd_req_t* request pointer is valid.
|
|
*
|
|
* @param[in] r The request whose socket descriptor should be found
|
|
*
|
|
* @return
|
|
* - Socket descriptor : The socket descriptor for this request
|
|
* - -1 : Invalid/NULL request pointer
|
|
*/
|
|
int httpd_req_to_sockfd(httpd_req_t *r);
|
|
|
|
/**
|
|
* @brief API to read content data from the HTTP request
|
|
*
|
|
* This API will read HTTP content data from the HTTP request into
|
|
* provided buffer. Use content_len provided in httpd_req_t structure
|
|
* to know the length of data to be fetched. If content_len is too
|
|
* large for the buffer then user may have to make multiple calls to
|
|
* this function, each time fetching 'buf_len' number of bytes,
|
|
* while the pointer to content data is incremented internally by
|
|
* the same number.
|
|
*
|
|
* @note
|
|
* - This API is supposed to be called only from the context of
|
|
* a URI handler where httpd_req_t* request pointer is valid.
|
|
* - If an error is returned, the URI handler must further return an error.
|
|
* This will ensure that the erroneous socket is closed and cleaned up by
|
|
* the web server.
|
|
* - Presently Chunked Encoding is not supported
|
|
*
|
|
* @param[in] r The request being responded to
|
|
* @param[in] buf Pointer to a buffer that the data will be read into
|
|
* @param[in] buf_len Length of the buffer
|
|
*
|
|
* @return
|
|
* - Bytes : Number of bytes read into the buffer successfully
|
|
* - 0 : Buffer length parameter is zero / connection closed by peer
|
|
* - HTTPD_SOCK_ERR_INVALID : Invalid arguments
|
|
* - HTTPD_SOCK_ERR_TIMEOUT : Timeout/interrupted while calling socket recv()
|
|
* - HTTPD_SOCK_ERR_FAIL : Unrecoverable error while calling socket recv()
|
|
*/
|
|
int httpd_req_recv(httpd_req_t *r, char *buf, size_t buf_len);
|
|
|
|
/**
|
|
* @brief Search for a field in request headers and
|
|
* return the string length of it's value
|
|
*
|
|
* @note
|
|
* - This API is supposed to be called only from the context of
|
|
* a URI handler where httpd_req_t* request pointer is valid.
|
|
* - Once httpd_resp_send() API is called all request headers
|
|
* are purged, so request headers need be copied into separate
|
|
* buffers if they are required later.
|
|
*
|
|
* @param[in] r The request being responded to
|
|
* @param[in] field The header field to be searched in the request
|
|
*
|
|
* @return
|
|
* - Length : If field is found in the request URL
|
|
* - Zero : Field not found / Invalid request / Null arguments
|
|
*/
|
|
size_t httpd_req_get_hdr_value_len(httpd_req_t *r, const char *field);
|
|
|
|
/**
|
|
* @brief Get the value string of a field from the request headers
|
|
*
|
|
* @note
|
|
* - This API is supposed to be called only from the context of
|
|
* a URI handler where httpd_req_t* request pointer is valid.
|
|
* - Once httpd_resp_send() API is called all request headers
|
|
* are purged, so request headers need be copied into separate
|
|
* buffers if they are required later.
|
|
* - If output size is greater than input, then the value is truncated,
|
|
* accompanied by truncation error as return value.
|
|
* - Use httpd_req_get_hdr_value_len() to know the right buffer length
|
|
*
|
|
* @param[in] r The request being responded to
|
|
* @param[in] field The field to be searched in the header
|
|
* @param[out] val Pointer to the buffer into which the value will be copied if the field is found
|
|
* @param[in] val_size Size of the user buffer "val"
|
|
*
|
|
* @return
|
|
* - ESP_OK : Field found in the request header and value string copied
|
|
* - ESP_ERR_NOT_FOUND : Key not found
|
|
* - ESP_ERR_INVALID_ARG : Null arguments
|
|
* - ESP_ERR_HTTPD_INVALID_REQ : Invalid HTTP request pointer
|
|
* - ESP_ERR_HTTPD_RESULT_TRUNC : Value string truncated
|
|
*/
|
|
esp_err_t httpd_req_get_hdr_value_str(httpd_req_t *r, const char *field, char *val, size_t val_size);
|
|
|
|
/**
|
|
* @brief Get Query string length from the request URL
|
|
*
|
|
* @note This API is supposed to be called only from the context of
|
|
* a URI handler where httpd_req_t* request pointer is valid
|
|
*
|
|
* @param[in] r The request being responded to
|
|
*
|
|
* @return
|
|
* - Length : Query is found in the request URL
|
|
* - Zero : Query not found / Null arguments / Invalid request
|
|
*/
|
|
size_t httpd_req_get_url_query_len(httpd_req_t *r);
|
|
|
|
/**
|
|
* @brief Get Query string from the request URL
|
|
*
|
|
* @note
|
|
* - Presently, the user can fetch the full URL query string, but decoding
|
|
* will have to be performed by the user. Request headers can be read using
|
|
* httpd_req_get_hdr_value_str() to know the 'Content-Type' (eg. Content-Type:
|
|
* application/x-www-form-urlencoded) and then the appropriate decoding
|
|
* algorithm needs to be applied.
|
|
* - This API is supposed to be called only from the context of
|
|
* a URI handler where httpd_req_t* request pointer is valid
|
|
* - If output size is greater than input, then the value is truncated,
|
|
* accompanied by truncation error as return value
|
|
* - Use httpd_req_get_url_query_len() to know the right buffer length
|
|
*
|
|
* @param[in] r The request being responded to
|
|
* @param[out] buf Pointer to the buffer into which the query string will be copied (if found)
|
|
* @param[in] buf_len Length of output buffer
|
|
*
|
|
* @return
|
|
* - ESP_OK : Query is found in the request URL and copied to buffer
|
|
* - ESP_ERR_NOT_FOUND : Query not found
|
|
* - ESP_ERR_INVALID_ARG : Null arguments
|
|
* - ESP_ERR_HTTPD_INVALID_REQ : Invalid HTTP request pointer
|
|
* - ESP_ERR_HTTPD_RESULT_TRUNC : Query string truncated
|
|
*/
|
|
esp_err_t httpd_req_get_url_query_str(httpd_req_t *r, char *buf, size_t buf_len);
|
|
|
|
/**
|
|
* @brief Helper function to get a URL query tag from a query
|
|
* string of the type param1=val1¶m2=val2
|
|
*
|
|
* @note
|
|
* - The components of URL query string (keys and values) are not URLdecoded.
|
|
* The user must check for 'Content-Type' field in the request headers and
|
|
* then depending upon the specified encoding (URLencoded or otherwise) apply
|
|
* the appropriate decoding algorithm.
|
|
* - If actual value size is greater than val_size, then the value is truncated,
|
|
* accompanied by truncation error as return value.
|
|
*
|
|
* @param[in] qry Pointer to query string
|
|
* @param[in] key The key to be searched in the query string
|
|
* @param[out] val Pointer to the buffer into which the value will be copied if the key is found
|
|
* @param[in] val_size Size of the user buffer "val"
|
|
*
|
|
* @return
|
|
* - ESP_OK : Key is found in the URL query string and copied to buffer
|
|
* - ESP_ERR_NOT_FOUND : Key not found
|
|
* - ESP_ERR_INVALID_ARG : Null arguments
|
|
* - ESP_ERR_HTTPD_RESULT_TRUNC : Value string truncated
|
|
*/
|
|
esp_err_t httpd_query_key_value(const char *qry, const char *key, char *val, size_t val_size);
|
|
|
|
/**
|
|
* @brief API to send a complete HTTP response.
|
|
*
|
|
* This API will send the data as an HTTP response to the request.
|
|
* This assumes that you have the entire response ready in a single
|
|
* buffer. If you wish to send response in incremental chunks use
|
|
* httpd_resp_send_chunk() instead.
|
|
*
|
|
* If no status code and content-type were set, by default this
|
|
* will send 200 OK status code and content type as text/html.
|
|
* You may call the following functions before this API to configure
|
|
* the response headers :
|
|
* httpd_resp_set_status() - for setting the HTTP status string,
|
|
* httpd_resp_set_type() - for setting the Content Type,
|
|
* httpd_resp_set_hdr() - for appending any additional field
|
|
* value entries in the response header
|
|
*
|
|
* @note
|
|
* - This API is supposed to be called only from the context of
|
|
* a URI handler where httpd_req_t* request pointer is valid.
|
|
* - Once this API is called, the request has been responded to.
|
|
* - No additional data can then be sent for the request.
|
|
* - Once this API is called, all request headers are purged, so
|
|
* request headers need be copied into separate buffers if
|
|
* they are required later.
|
|
*
|
|
* @param[in] r The request being responded to
|
|
* @param[in] buf Buffer from where the content is to be fetched
|
|
* @param[in] buf_len Length of the buffer, -1 to use strlen()
|
|
*
|
|
* @return
|
|
* - ESP_OK : On successfully sending the response packet
|
|
* - ESP_ERR_INVALID_ARG : Null request pointer
|
|
* - ESP_ERR_HTTPD_RESP_HDR : Essential headers are too large for internal buffer
|
|
* - ESP_ERR_HTTPD_RESP_SEND : Error in raw send
|
|
* - ESP_ERR_HTTPD_INVALID_REQ : Invalid request
|
|
*/
|
|
esp_err_t httpd_resp_send(httpd_req_t *r, const char *buf, ssize_t buf_len);
|
|
|
|
/**
|
|
* @brief API to send one HTTP chunk
|
|
*
|
|
* This API will send the data as an HTTP response to the
|
|
* request. This API will use chunked-encoding and send the response
|
|
* in the form of chunks. If you have the entire response contained in
|
|
* a single buffer, please use httpd_resp_send() instead.
|
|
*
|
|
* If no status code and content-type were set, by default this will
|
|
* send 200 OK status code and content type as text/html. You may
|
|
* call the following functions before this API to configure the
|
|
* response headers
|
|
* httpd_resp_set_status() - for setting the HTTP status string,
|
|
* httpd_resp_set_type() - for setting the Content Type,
|
|
* httpd_resp_set_hdr() - for appending any additional field
|
|
* value entries in the response header
|
|
*
|
|
* @note
|
|
* - This API is supposed to be called only from the context of
|
|
* a URI handler where httpd_req_t* request pointer is valid.
|
|
* - When you are finished sending all your chunks, you must call
|
|
* this function with buf_len as 0.
|
|
* - Once this API is called, all request headers are purged, so
|
|
* request headers need be copied into separate buffers if they
|
|
* are required later.
|
|
*
|
|
* @param[in] r The request being responded to
|
|
* @param[in] buf Pointer to a buffer that stores the data
|
|
* @param[in] buf_len Length of the data from the buffer that should be sent out, -1 to use strlen()
|
|
*
|
|
* @return
|
|
* - ESP_OK : On successfully sending the response packet chunk
|
|
* - ESP_ERR_INVALID_ARG : Null request pointer
|
|
* - ESP_ERR_HTTPD_RESP_HDR : Essential headers are too large for internal buffer
|
|
* - ESP_ERR_HTTPD_RESP_SEND : Error in raw send
|
|
* - ESP_ERR_HTTPD_INVALID_REQ : Invalid request pointer
|
|
*/
|
|
esp_err_t httpd_resp_send_chunk(httpd_req_t *r, const char *buf, ssize_t buf_len);
|
|
|
|
/* Some commonly used status codes */
|
|
#define HTTPD_200 "200 OK" /*!< HTTP Response 200 */
|
|
#define HTTPD_204 "204 No Content" /*!< HTTP Response 204 */
|
|
#define HTTPD_207 "207 Multi-Status" /*!< HTTP Response 207 */
|
|
#define HTTPD_400 "400 Bad Request" /*!< HTTP Response 400 */
|
|
#define HTTPD_404 "404 Not Found" /*!< HTTP Response 404 */
|
|
#define HTTPD_408 "408 Request Timeout" /*!< HTTP Response 408 */
|
|
#define HTTPD_500 "500 Internal Server Error" /*!< HTTP Response 500 */
|
|
|
|
/**
|
|
* @brief API to set the HTTP status code
|
|
*
|
|
* This API sets the status of the HTTP response to the value specified.
|
|
* By default, the '200 OK' response is sent as the response.
|
|
*
|
|
* @note
|
|
* - This API is supposed to be called only from the context of
|
|
* a URI handler where httpd_req_t* request pointer is valid.
|
|
* - This API only sets the status to this value. The status isn't
|
|
* sent out until any of the send APIs is executed.
|
|
* - Make sure that the lifetime of the status string is valid till
|
|
* send function is called.
|
|
*
|
|
* @param[in] r The request being responded to
|
|
* @param[in] status The HTTP status code of this response
|
|
*
|
|
* @return
|
|
* - ESP_OK : On success
|
|
* - ESP_ERR_INVALID_ARG : Null arguments
|
|
* - ESP_ERR_HTTPD_INVALID_REQ : Invalid request pointer
|
|
*/
|
|
esp_err_t httpd_resp_set_status(httpd_req_t *r, const char *status);
|
|
|
|
/* Some commonly used content types */
|
|
#define HTTPD_TYPE_JSON "application/json" /*!< HTTP Content type JSON */
|
|
#define HTTPD_TYPE_TEXT "text/html" /*!< HTTP Content type text/HTML */
|
|
#define HTTPD_TYPE_OCTET "application/octet-stream" /*!< HTTP Content type octext-stream */
|
|
|
|
/**
|
|
* @brief API to set the HTTP content type
|
|
*
|
|
* This API sets the 'Content Type' field of the response.
|
|
* The default content type is 'text/html'.
|
|
*
|
|
* @note
|
|
* - This API is supposed to be called only from the context of
|
|
* a URI handler where httpd_req_t* request pointer is valid.
|
|
* - This API only sets the content type to this value. The type
|
|
* isn't sent out until any of the send APIs is executed.
|
|
* - Make sure that the lifetime of the type string is valid till
|
|
* send function is called.
|
|
*
|
|
* @param[in] r The request being responded to
|
|
* @param[in] type The Content Type of the response
|
|
*
|
|
* @return
|
|
* - ESP_OK : On success
|
|
* - ESP_ERR_INVALID_ARG : Null arguments
|
|
* - ESP_ERR_HTTPD_INVALID_REQ : Invalid request pointer
|
|
*/
|
|
esp_err_t httpd_resp_set_type(httpd_req_t *r, const char *type);
|
|
|
|
/**
|
|
* @brief API to append any additional headers
|
|
*
|
|
* This API sets any additional header fields that need to be sent in the response.
|
|
*
|
|
* @note
|
|
* - This API is supposed to be called only from the context of
|
|
* a URI handler where httpd_req_t* request pointer is valid.
|
|
* - The header isn't sent out until any of the send APIs is executed.
|
|
* - The maximum allowed number of additional headers is limited to
|
|
* value of max_resp_headers in config structure.
|
|
* - Make sure that the lifetime of the field value strings are valid till
|
|
* send function is called.
|
|
*
|
|
* @param[in] r The request being responded to
|
|
* @param[in] field The field name of the HTTP header
|
|
* @param[in] value The value of this HTTP header
|
|
*
|
|
* @return
|
|
* - ESP_OK : On successfully appending new header
|
|
* - ESP_ERR_INVALID_ARG : Null arguments
|
|
* - ESP_ERR_HTTPD_RESP_HDR : Total additional headers exceed max allowed
|
|
* - ESP_ERR_HTTPD_INVALID_REQ : Invalid request pointer
|
|
*/
|
|
esp_err_t httpd_resp_set_hdr(httpd_req_t *r, const char *field, const char *value);
|
|
|
|
/**
|
|
* @brief Helper function for HTTP 404
|
|
*
|
|
* Send HTTP 404 message. If you wish to send additional data in the body of the
|
|
* response, please use the lower-level functions directly.
|
|
*
|
|
* @note
|
|
* - This API is supposed to be called only from the context of
|
|
* a URI handler where httpd_req_t* request pointer is valid.
|
|
* - Once this API is called, all request headers are purged, so
|
|
* request headers need be copied into separate buffers if
|
|
* they are required later.
|
|
*
|
|
* @param[in] r The request being responded to
|
|
*
|
|
* @return
|
|
* - ESP_OK : On successfully sending the response packet
|
|
* - ESP_ERR_INVALID_ARG : Null arguments
|
|
* - ESP_ERR_HTTPD_RESP_SEND : Error in raw send
|
|
* - ESP_ERR_HTTPD_INVALID_REQ : Invalid request pointer
|
|
*/
|
|
esp_err_t httpd_resp_send_404(httpd_req_t *r);
|
|
|
|
/**
|
|
* @brief Helper function for HTTP 408
|
|
*
|
|
* Send HTTP 408 message. If you wish to send additional data in the body of the
|
|
* response, please use the lower-level functions directly.
|
|
*
|
|
* @note
|
|
* - This API is supposed to be called only from the context of
|
|
* a URI handler where httpd_req_t* request pointer is valid.
|
|
* - Once this API is called, all request headers are purged, so
|
|
* request headers need be copied into separate buffers if
|
|
* they are required later.
|
|
*
|
|
* @param[in] r The request being responded to
|
|
*
|
|
* @return
|
|
* - ESP_OK : On successfully sending the response packet
|
|
* - ESP_ERR_INVALID_ARG : Null arguments
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|
* - ESP_ERR_HTTPD_RESP_SEND : Error in raw send
|
|
* - ESP_ERR_HTTPD_INVALID_REQ : Invalid request pointer
|
|
*/
|
|
esp_err_t httpd_resp_send_408(httpd_req_t *r);
|
|
|
|
/**
|
|
* @brief Helper function for HTTP 500
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|
*
|
|
* Send HTTP 500 message. If you wish to send additional data in the body of the
|
|
* response, please use the lower-level functions directly.
|
|
*
|
|
* @note
|
|
* - This API is supposed to be called only from the context of
|
|
* a URI handler where httpd_req_t* request pointer is valid.
|
|
* - Once this API is called, all request headers are purged, so
|
|
* request headers need be copied into separate buffers if
|
|
* they are required later.
|
|
*
|
|
* @param[in] r The request being responded to
|
|
*
|
|
* @return
|
|
* - ESP_OK : On successfully sending the response packet
|
|
* - ESP_ERR_INVALID_ARG : Null arguments
|
|
* - ESP_ERR_HTTPD_RESP_SEND : Error in raw send
|
|
* - ESP_ERR_HTTPD_INVALID_REQ : Invalid request pointer
|
|
*/
|
|
esp_err_t httpd_resp_send_500(httpd_req_t *r);
|
|
|
|
/**
|
|
* @brief Raw HTTP send
|
|
*
|
|
* Call this API if you wish to construct your custom response packet.
|
|
* When using this, all essential header, eg. HTTP version, Status Code,
|
|
* Content Type and Length, Encoding, etc. will have to be constructed
|
|
* manually, and HTTP delimeters (CRLF) will need to be placed correctly
|
|
* for separating sub-sections of the HTTP response packet.
|
|
*
|
|
* If the send override function is set, this API will end up
|
|
* calling that function eventually to send data out.
|
|
*
|
|
* @note
|
|
* - This API is supposed to be called only from the context of
|
|
* a URI handler where httpd_req_t* request pointer is valid.
|
|
* - Unless the response has the correct HTTP structure (which the
|
|
* user must now ensure) it is not guaranteed that it will be
|
|
* recognized by the client. For most cases, you wouldn't have
|
|
* to call this API, but you would rather use either of :
|
|
* httpd_resp_send(),
|
|
* httpd_resp_send_chunk()
|
|
*
|
|
* @param[in] r The request being responded to
|
|
* @param[in] buf Buffer from where the fully constructed packet is to be read
|
|
* @param[in] buf_len Length of the buffer
|
|
*
|
|
* @return
|
|
* - Bytes : Number of bytes that were sent successfully
|
|
* - HTTPD_SOCK_ERR_INVALID : Invalid arguments
|
|
* - HTTPD_SOCK_ERR_TIMEOUT : Timeout/interrupted while calling socket send()
|
|
* - HTTPD_SOCK_ERR_FAIL : Unrecoverable error while calling socket send()
|
|
*/
|
|
int httpd_send(httpd_req_t *r, const char *buf, size_t buf_len);
|
|
|
|
/** End of Request / Response
|
|
* @}
|
|
*/
|
|
|
|
/* ************** Group: Session ************** */
|
|
/** @name Session
|
|
* Functions for controlling sessions and accessing context data
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* @brief Get session context from socket descriptor
|
|
*
|
|
* Typically if a session context is created, it is available to URI handlers
|
|
* through the httpd_req_t structure. But, there are cases where the web
|
|
* server's send/receive functions may require the context (for example, for
|
|
* accessing keying information etc). Since the send/receive function only have
|
|
* the socket descriptor at their disposal, this API provides them with a way to
|
|
* retrieve the session context.
|
|
*
|
|
* @param[in] handle Handle to server returned by httpd_start
|
|
* @param[in] sockfd The socket descriptor for which the context should be extracted.
|
|
*
|
|
* @return
|
|
* - void* : Pointer to the context associated with this session
|
|
* - NULL : Empty context / Invalid handle / Invalid socket fd
|
|
*/
|
|
void *httpd_sess_get_ctx(httpd_handle_t handle, int sockfd);
|
|
|
|
/**
|
|
* @brief Set session context by socket descriptor
|
|
*
|
|
* @param[in] handle Handle to server returned by httpd_start
|
|
* @param[in] sockfd The socket descriptor for which the context should be extracted.
|
|
* @param[in] ctx Context object to assign to the session
|
|
* @param[in] free_fn Function that should be called to free the context
|
|
*/
|
|
void httpd_sess_set_ctx(httpd_handle_t handle, int sockfd, void *ctx, httpd_free_ctx_fn_t free_fn);
|
|
|
|
/**
|
|
* @brief Get session 'transport' context by socket descriptor
|
|
* @see httpd_sess_get_ctx()
|
|
*
|
|
* This context is used by the send/receive functions, for example to manage SSL context.
|
|
*
|
|
* @param[in] handle Handle to server returned by httpd_start
|
|
* @param[in] sockfd The socket descriptor for which the context should be extracted.
|
|
* @return
|
|
* - void* : Pointer to the transport context associated with this session
|
|
* - NULL : Empty context / Invalid handle / Invalid socket fd
|
|
*/
|
|
void *httpd_sess_get_transport_ctx(httpd_handle_t handle, int sockfd);
|
|
|
|
/**
|
|
* @brief Set session 'transport' context by socket descriptor
|
|
* @see httpd_sess_set_ctx()
|
|
*
|
|
* @param[in] handle Handle to server returned by httpd_start
|
|
* @param[in] sockfd The socket descriptor for which the context should be extracted.
|
|
* @param[in] ctx Transport context object to assign to the session
|
|
* @param[in] free_fn Function that should be called to free the transport context
|
|
*/
|
|
void httpd_sess_set_transport_ctx(httpd_handle_t handle, int sockfd, void *ctx, httpd_free_ctx_fn_t free_fn);
|
|
|
|
/**
|
|
* @brief Get HTTPD global user context (it was set in the server config struct)
|
|
*
|
|
* @param[in] handle Handle to server returned by httpd_start
|
|
* @return global user context
|
|
*/
|
|
void *httpd_get_global_user_ctx(httpd_handle_t handle);
|
|
|
|
/**
|
|
* @brief Get HTTPD global transport context (it was set in the server config struct)
|
|
*
|
|
* @param[in] handle Handle to server returned by httpd_start
|
|
* @return global transport context
|
|
*/
|
|
void *httpd_get_global_transport_ctx(httpd_handle_t handle);
|
|
|
|
/**
|
|
* @brief Trigger an httpd session close externally
|
|
*
|
|
* @note Calling this API is only required in special circumstances wherein
|
|
* some application requires to close an httpd client session asynchronously.
|
|
*
|
|
* @param[in] handle Handle to server returned by httpd_start
|
|
* @param[in] sockfd The socket descriptor of the session to be closed
|
|
*
|
|
* @return
|
|
* - ESP_OK : On successfully initiating closure
|
|
* - ESP_FAIL : Failure to queue work
|
|
* - ESP_ERR_NOT_FOUND : Socket fd not found
|
|
* - ESP_ERR_INVALID_ARG : Null arguments
|
|
*/
|
|
esp_err_t httpd_sess_trigger_close(httpd_handle_t handle, int sockfd);
|
|
|
|
/**
|
|
* @brief Update timestamp for a given socket
|
|
*
|
|
* Timestamps are internally associated with each session to monitor
|
|
* how recently a session exchanged traffic. When LRU purge is enabled,
|
|
* if a client is requesting for connection but maximum number of
|
|
* sockets/sessions is reached, then the session having the earliest
|
|
* timestamp is closed automatically.
|
|
*
|
|
* Updating the timestamp manually prevents the socket from being purged
|
|
* due to the Least Recently Used (LRU) logic, even though it might not
|
|
* have received traffic for some time. This is useful when all open
|
|
* sockets/session are frequently exchanging traffic but the user specifically
|
|
* wants one of the sessions to be kept open, irrespective of when it last
|
|
* exchanged a packet.
|
|
*
|
|
* @note Calling this API is only necessary if the LRU Purge Enable option
|
|
* is enabled.
|
|
*
|
|
* @param[in] handle Handle to server returned by httpd_start
|
|
* @param[in] sockfd The socket descriptor of the session for which timestamp
|
|
* is to be updated
|
|
*
|
|
* @return
|
|
* - ESP_OK : Socket found and timestamp updated
|
|
* - ESP_ERR_NOT_FOUND : Socket not found
|
|
* - ESP_ERR_INVALID_ARG : Null arguments
|
|
*/
|
|
esp_err_t httpd_sess_update_timestamp(httpd_handle_t handle, int sockfd);
|
|
|
|
/** End of Session
|
|
* @}
|
|
*/
|
|
|
|
/* ************** Group: Work Queue ************** */
|
|
/** @name Work Queue
|
|
* APIs related to the HTTPD Work Queue
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* @brief Prototype of the HTTPD work function
|
|
* Please refer to httpd_queue_work() for more details.
|
|
* @param[in] arg The arguments for this work function
|
|
*/
|
|
typedef void (*httpd_work_fn_t)(void *arg);
|
|
|
|
/**
|
|
* @brief Queue execution of a function in HTTPD's context
|
|
*
|
|
* This API queues a work function for asynchronous execution
|
|
*
|
|
* @note Some protocols require that the web server generate some asynchronous data
|
|
* and send it to the persistently opened connection. This facility is for use
|
|
* by such protocols.
|
|
*
|
|
* @param[in] handle Handle to server returned by httpd_start
|
|
* @param[in] work Pointer to the function to be executed in the HTTPD's context
|
|
* @param[in] arg Pointer to the arguments that should be passed to this function
|
|
*
|
|
* @return
|
|
* - ESP_OK : On successfully queueing the work
|
|
* - ESP_FAIL : Failure in ctrl socket
|
|
* - ESP_ERR_INVALID_ARG : Null arguments
|
|
*/
|
|
esp_err_t httpd_queue_work(httpd_handle_t handle, httpd_work_fn_t work, void *arg);
|
|
|
|
/** End of Group Work Queue
|
|
* @}
|
|
*/
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* ! _ESP_HTTP_SERVER_H_ */
|