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esp-idf/components/esp_http_client/include/esp_http_client.h

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// Copyright 2015-2018 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef _ESP_HTTP_CLIENT_H
#define _ESP_HTTP_CLIENT_H
#include "freertos/FreeRTOS.h"
#include "http_parser.h"
#include "sdkconfig.h"
#include "esp_err.h"
#ifdef __cplusplus
extern "C" {
#endif
#define DEFAULT_HTTP_BUF_SIZE (512)
typedef struct esp_http_client *esp_http_client_handle_t;
typedef struct esp_http_client_event *esp_http_client_event_handle_t;
/**
* @brief HTTP Client events id
*/
typedef enum {
HTTP_EVENT_ERROR = 0, /*!< This event occurs when there are any errors during execution */
HTTP_EVENT_ON_CONNECTED, /*!< Once the HTTP has been connected to the server, no data exchange has been performed */
HTTP_EVENT_HEADERS_SENT, /*!< After sending all the headers to the server */
HTTP_EVENT_HEADER_SENT = HTTP_EVENT_HEADERS_SENT, /*!< This header has been kept for backward compatability
and will be deprecated in future versions esp-idf */
HTTP_EVENT_ON_HEADER, /*!< Occurs when receiving each header sent from the server */
HTTP_EVENT_ON_DATA, /*!< Occurs when receiving data from the server, possibly multiple portions of the packet */
HTTP_EVENT_ON_FINISH, /*!< Occurs when finish a HTTP session */
HTTP_EVENT_DISCONNECTED, /*!< The connection has been disconnected */
} esp_http_client_event_id_t;
/**
* @brief HTTP Client events data
*/
typedef struct esp_http_client_event {
esp_http_client_event_id_t event_id; /*!< event_id, to know the cause of the event */
esp_http_client_handle_t client; /*!< esp_http_client_handle_t context */
void *data; /*!< data of the event */
int data_len; /*!< data length of data */
void *user_data; /*!< user_data context, from esp_http_client_config_t user_data */
char *header_key; /*!< For HTTP_EVENT_ON_HEADER event_id, it's store current http header key */
char *header_value; /*!< For HTTP_EVENT_ON_HEADER event_id, it's store current http header value */
} esp_http_client_event_t;
/**
* @brief HTTP Client transport
*/
typedef enum {
HTTP_TRANSPORT_UNKNOWN = 0x0, /*!< Unknown */
HTTP_TRANSPORT_OVER_TCP, /*!< Transport over tcp */
HTTP_TRANSPORT_OVER_SSL, /*!< Transport over ssl */
} esp_http_client_transport_t;
typedef esp_err_t (*http_event_handle_cb)(esp_http_client_event_t *evt);
/**
* @brief HTTP method
*/
typedef enum {
HTTP_METHOD_GET = 0, /*!< HTTP GET Method */
HTTP_METHOD_POST, /*!< HTTP POST Method */
HTTP_METHOD_PUT, /*!< HTTP PUT Method */
HTTP_METHOD_PATCH, /*!< HTTP PATCH Method */
HTTP_METHOD_DELETE, /*!< HTTP DELETE Method */
HTTP_METHOD_HEAD, /*!< HTTP HEAD Method */
HTTP_METHOD_NOTIFY, /*!< HTTP NOTIFY Method */
HTTP_METHOD_SUBSCRIBE, /*!< HTTP SUBSCRIBE Method */
HTTP_METHOD_UNSUBSCRIBE,/*!< HTTP UNSUBSCRIBE Method */
HTTP_METHOD_OPTIONS, /*!< HTTP OPTIONS Method */
HTTP_METHOD_MAX,
} esp_http_client_method_t;
/**
* @brief HTTP Authentication type
*/
typedef enum {
HTTP_AUTH_TYPE_NONE = 0, /*!< No authention */
HTTP_AUTH_TYPE_BASIC, /*!< HTTP Basic authentication */
HTTP_AUTH_TYPE_DIGEST, /*!< HTTP Disgest authentication */
} esp_http_client_auth_type_t;
/**
* @brief HTTP configuration
*/
typedef struct {
const char *url; /*!< HTTP URL, the information on the URL is most important, it overrides the other fields below, if any */
const char *host; /*!< Domain or IP as string */
int port; /*!< Port to connect, default depend on esp_http_client_transport_t (80 or 443) */
const char *username; /*!< Using for Http authentication */
const char *password; /*!< Using for Http authentication */
esp_http_client_auth_type_t auth_type; /*!< Http authentication type, see `esp_http_client_auth_type_t` */
const char *path; /*!< HTTP Path, if not set, default is `/` */
const char *query; /*!< HTTP query */
const char *cert_pem; /*!< SSL server certification, PEM format as string, if the client requires to verify server */
const char *client_cert_pem; /*!< SSL client certification, PEM format as string, if the server requires to verify client */
const char *client_key_pem; /*!< SSL client key, PEM format as string, if the server requires to verify client */
const char *user_agent; /*!< The User Agent string to send with HTTP requests */
esp_http_client_method_t method; /*!< HTTP Method */
int timeout_ms; /*!< Network timeout in milliseconds */
bool disable_auto_redirect; /*!< Disable HTTP automatic redirects */
int max_redirection_count; /*!< Max redirection number, using default value if zero*/
http_event_handle_cb event_handler; /*!< HTTP Event Handle */
esp_http_client_transport_t transport_type; /*!< HTTP transport type, see `esp_http_client_transport_t` */
int buffer_size; /*!< HTTP receive buffer size */
int buffer_size_tx; /*!< HTTP transmit buffer size */
void *user_data; /*!< HTTP user_data context */
bool is_async; /*!< Set asynchronous mode, only supported with HTTPS for now */
bool use_global_ca_store; /*!< Use a global ca_store for all the connections in which this bool is set. */
bool skip_cert_common_name_check; /*!< Skip any validation of server certificate CN field */
bool keep_alive_enable; /*!< Enable keep-alive timeout */
int keep_alive_idle; /*!< Keep-alive idle time. Default is 5 (second) */
int keep_alive_interval; /*!< Keep-alive interval time. Default is 5 (second) */
int keep_alive_count; /*!< Keep-alive packet retry send count. Default is 3 counts */
} esp_http_client_config_t;
/**
* Enum for the HTTP status codes.
*/
typedef enum {
/* 2xx - Success */
HttpStatus_Ok = 200,
/* 3xx - Redirection */
HttpStatus_MultipleChoices = 300,
HttpStatus_MovedPermanently = 301,
HttpStatus_Found = 302,
/* 4xx - Client Error */
HttpStatus_Unauthorized = 401
} HttpStatus_Code;
#define ESP_ERR_HTTP_BASE (0x7000) /*!< Starting number of HTTP error codes */
#define ESP_ERR_HTTP_MAX_REDIRECT (ESP_ERR_HTTP_BASE + 1) /*!< The error exceeds the number of HTTP redirects */
#define ESP_ERR_HTTP_CONNECT (ESP_ERR_HTTP_BASE + 2) /*!< Error open the HTTP connection */
#define ESP_ERR_HTTP_WRITE_DATA (ESP_ERR_HTTP_BASE + 3) /*!< Error write HTTP data */
#define ESP_ERR_HTTP_FETCH_HEADER (ESP_ERR_HTTP_BASE + 4) /*!< Error read HTTP header from server */
#define ESP_ERR_HTTP_INVALID_TRANSPORT (ESP_ERR_HTTP_BASE + 5) /*!< There are no transport support for the input scheme */
#define ESP_ERR_HTTP_CONNECTING (ESP_ERR_HTTP_BASE + 6) /*!< HTTP connection hasn't been established yet */
#define ESP_ERR_HTTP_EAGAIN (ESP_ERR_HTTP_BASE + 7) /*!< Mapping of errno EAGAIN to esp_err_t */
/**
* @brief Start a HTTP session
* This function must be the first function to call,
* and it returns a esp_http_client_handle_t that you must use as input to other functions in the interface.
* This call MUST have a corresponding call to esp_http_client_cleanup when the operation is complete.
*
* @param[in] config The configurations, see `http_client_config_t`
*
* @return
* - `esp_http_client_handle_t`
* - NULL if any errors
*/
esp_http_client_handle_t esp_http_client_init(const esp_http_client_config_t *config);
/**
* @brief Invoke this function after `esp_http_client_init` and all the options calls are made, and will perform the
* transfer as described in the options. It must be called with the same esp_http_client_handle_t as input as the esp_http_client_init call returned.
* esp_http_client_perform performs the entire request in either blocking or non-blocking manner. By default, the API performs request in a blocking manner and returns when done,
* or if it failed, and in non-blocking manner, it returns if EAGAIN/EWOULDBLOCK or EINPROGRESS is encountered, or if it failed. And in case of non-blocking request,
* the user may call this API multiple times unless request & response is complete or there is a failure. To enable non-blocking esp_http_client_perform(), `is_async` member of esp_http_client_config_t
* must be set while making a call to esp_http_client_init() API.
* You can do any amount of calls to esp_http_client_perform while using the same esp_http_client_handle_t. The underlying connection may be kept open if the server allows it.
* If you intend to transfer more than one file, you are even encouraged to do so.
* esp_http_client will then attempt to re-use the same connection for the following transfers, thus making the operations faster, less CPU intense and using less network resources.
* Just note that you will have to use `esp_http_client_set_**` between the invokes to set options for the following esp_http_client_perform.
*
* @note You must never call this function simultaneously from two places using the same client handle.
* Let the function return first before invoking it another time.
* If you want parallel transfers, you must use several esp_http_client_handle_t.
* This function include `esp_http_client_open` -> `esp_http_client_write` -> `esp_http_client_fetch_headers` -> `esp_http_client_read` (and option) `esp_http_client_close`.
*
* @param client The esp_http_client handle
*
* @return
* - ESP_OK on successful
* - ESP_FAIL on error
*/
esp_err_t esp_http_client_perform(esp_http_client_handle_t client);
/**
* @brief Set URL for client, when performing this behavior, the options in the URL will replace the old ones
*
* @param[in] client The esp_http_client handle
* @param[in] url The url
*
* @return
* - ESP_OK
* - ESP_FAIL
*/
esp_err_t esp_http_client_set_url(esp_http_client_handle_t client, const char *url);
/**
* @brief Set post data, this function must be called before `esp_http_client_perform`.
* Note: The data parameter passed to this function is a pointer and this function will not copy the data
*
* @param[in] client The esp_http_client handle
* @param[in] data post data pointer
* @param[in] len post length
*
* @return
* - ESP_OK
* - ESP_FAIL
*/
esp_err_t esp_http_client_set_post_field(esp_http_client_handle_t client, const char *data, int len);
/**
* @brief Get current post field information
*
* @param[in] client The client
* @param[out] data Point to post data pointer
*
* @return Size of post data
*/
int esp_http_client_get_post_field(esp_http_client_handle_t client, char **data);
/**
* @brief Set http request header, this function must be called after esp_http_client_init and before any
* perform function
*
* @param[in] client The esp_http_client handle
* @param[in] key The header key
* @param[in] value The header value
*
* @return
* - ESP_OK
* - ESP_FAIL
*/
esp_err_t esp_http_client_set_header(esp_http_client_handle_t client, const char *key, const char *value);
/**
* @brief Get http request header.
* The value parameter will be set to NULL if there is no header which is same as
* the key specified, otherwise the address of header value will be assigned to value parameter.
* This function must be called after `esp_http_client_init`.
*
* @param[in] client The esp_http_client handle
* @param[in] key The header key
* @param[out] value The header value
*
* @return
* - ESP_OK
* - ESP_FAIL
*/
esp_err_t esp_http_client_get_header(esp_http_client_handle_t client, const char *key, char **value);
/**
* @brief Get http request username.
* The address of username buffer will be assigned to value parameter.
* This function must be called after `esp_http_client_init`.
*
* @param[in] client The esp_http_client handle
* @param[out] value The username value
*
* @return
* - ESP_OK
* - ESP_ERR_INVALID_ARG
*/
esp_err_t esp_http_client_get_username(esp_http_client_handle_t client, char **value);
/**
* @brief Set http request username.
* The value of username parameter will be assigned to username buffer.
* If the username parameter is NULL then username buffer will be freed.
*
* @param[in] client The esp_http_client handle
* @param[in] username The username value
*
* @return
* - ESP_OK
* - ESP_ERR_INVALID_ARG
*/
esp_err_t esp_http_client_set_username(esp_http_client_handle_t client, const char *username);
/**
* @brief Get http request password.
* The address of password buffer will be assigned to value parameter.
* This function must be called after `esp_http_client_init`.
*
* @param[in] client The esp_http_client handle
* @param[out] value The password value
*
* @return
* - ESP_OK
* - ESP_ERR_INVALID_ARG
*/
esp_err_t esp_http_client_get_password(esp_http_client_handle_t client, char **value);
/**
* @brief Set http request password.
* The value of password parameter will be assigned to password buffer.
* If the password parameter is NULL then password buffer will be freed.
*
* @param[in] client The esp_http_client handle
* @param[in] password The password value
*
* @return
* - ESP_OK
* - ESP_ERR_INVALID_ARG
*/
esp_err_t esp_http_client_set_password(esp_http_client_handle_t client, char *password);
/**
* @brief Set http request method
*
* @param[in] client The esp_http_client handle
* @param[in] method The method
*
* @return
* - ESP_OK
* - ESP_ERR_INVALID_ARG
*/
esp_err_t esp_http_client_set_method(esp_http_client_handle_t client, esp_http_client_method_t method);
/**
* @brief Delete http request header
*
* @param[in] client The esp_http_client handle
* @param[in] key The key
*
* @return
* - ESP_OK
* - ESP_FAIL
*/
esp_err_t esp_http_client_delete_header(esp_http_client_handle_t client, const char *key);
/**
* @brief This function will be open the connection, write all header strings and return
*
* @param[in] client The esp_http_client handle
* @param[in] write_len HTTP Content length need to write to the server
*
* @return
* - ESP_OK
* - ESP_FAIL
*/
esp_err_t esp_http_client_open(esp_http_client_handle_t client, int write_len);
/**
* @brief This function will write data to the HTTP connection previously opened by esp_http_client_open()
*
* @param[in] client The esp_http_client handle
* @param buffer The buffer
* @param[in] len This value must not be larger than the write_len parameter provided to esp_http_client_open()
*
* @return
* - (-1) if any errors
* - Length of data written
*/
int esp_http_client_write(esp_http_client_handle_t client, const char *buffer, int len);
/**
* @brief This function need to call after esp_http_client_open, it will read from http stream, process all receive headers
*
* @param[in] client The esp_http_client handle
*
* @return
* - (0) if stream doesn't contain content-length header, or chunked encoding (checked by `esp_http_client_is_chunked` response)
* - (-1: ESP_FAIL) if any errors
* - Download data length defined by content-length header
*/
int esp_http_client_fetch_headers(esp_http_client_handle_t client);
/**
* @brief Check response data is chunked
*
* @param[in] client The esp_http_client handle
*
* @return true or false
*/
bool esp_http_client_is_chunked_response(esp_http_client_handle_t client);
/**
* @brief Read data from http stream
*
* @param[in] client The esp_http_client handle
* @param buffer The buffer
* @param[in] len The length
*
* @return
* - (-1) if any errors
* - Length of data was read
*/
int esp_http_client_read(esp_http_client_handle_t client, char *buffer, int len);
/**
* @brief Get http response status code, the valid value if this function invoke after `esp_http_client_perform`
*
* @param[in] client The esp_http_client handle
*
* @return Status code
*/
int esp_http_client_get_status_code(esp_http_client_handle_t client);
/**
* @brief Get http response content length (from header Content-Length)
* the valid value if this function invoke after `esp_http_client_perform`
*
* @param[in] client The esp_http_client handle
*
* @return
* - (-1) Chunked transfer
* - Content-Length value as bytes
*/
int esp_http_client_get_content_length(esp_http_client_handle_t client);
/**
* @brief Close http connection, still kept all http request resources
*
* @param[in] client The esp_http_client handle
*
* @return
* - ESP_OK
* - ESP_FAIL
*/
esp_err_t esp_http_client_close(esp_http_client_handle_t client);
/**
* @brief This function must be the last function to call for an session.
* It is the opposite of the esp_http_client_init function and must be called with the same handle as input that a esp_http_client_init call returned.
* This might close all connections this handle has used and possibly has kept open until now.
* Don't call this function if you intend to transfer more files, re-using handles is a key to good performance with esp_http_client.
*
* @param[in] client The esp_http_client handle
*
* @return
* - ESP_OK
* - ESP_FAIL
*/
esp_err_t esp_http_client_cleanup(esp_http_client_handle_t client);
/**
* @brief Get transport type
*
* @param[in] client The esp_http_client handle
*
* @return
* - HTTP_TRANSPORT_UNKNOWN
* - HTTP_TRANSPORT_OVER_TCP
* - HTTP_TRANSPORT_OVER_SSL
*/
esp_http_client_transport_t esp_http_client_get_transport_type(esp_http_client_handle_t client);
/**
* @brief Set redirection URL.
* When received the 30x code from the server, the client stores the redirect URL provided by the server.
* This function will set the current URL to redirect to enable client to execute the redirection request.
*
* @param[in] client The esp_http_client handle
*
* @return
* - ESP_OK
* - ESP_FAIL
*/
esp_err_t esp_http_client_set_redirection(esp_http_client_handle_t client);
/**
* @brief On receiving HTTP Status code 401, this API can be invoked to add authorization
* information.
*
* @note There is a possibility of receiving body message with redirection status codes, thus make sure
* to flush off body data after calling this API.
*
* @param[in] client The esp_http_client handle
*/
void esp_http_client_add_auth(esp_http_client_handle_t client);
/**
* @brief Checks if entire data in the response has been read without any error.
*
* @param[in] client The esp_http_client handle
*
* @return
* - true
* - false
*/
bool esp_http_client_is_complete_data_received(esp_http_client_handle_t client);
#ifdef __cplusplus
}
#endif
#endif
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