// 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_COPY, /*!< HTTP COPY Method */ HTTP_METHOD_MOVE, /*!< HTTP MOVE Method */ HTTP_METHOD_LOCK, /*!< HTTP LOCK Method */ HTTP_METHOD_UNLOCK, /*!< HTTP UNLOCK Method */ HTTP_METHOD_PROPFIND, /*!< HTTP PROPFIND Method */ HTTP_METHOD_PROPPATCH, /*!< HTTP PROPPATCH Method */ HTTP_METHOD_MKCOL, /*!< HTTP MKCOL 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 number of redirections on receiving HTTP redirect status code, using default value if zero*/ int max_authorization_retries; /*!< Max connection retries on receiving HTTP unauthorized status code, using default value if zero. Disables authorization retry if -1*/ 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, HttpStatus_TemporaryRedirect = 307, /* 4xx - Client Error */ HttpStatus_Unauthorized = 401, HttpStatus_Forbidden = 403, HttpStatus_NotFound = 404, /* 5xx - Server Error */ HttpStatus_InternalError = 500 } 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 auth_type. * * @param[in] client The esp_http_client handle * @param[in] auth_type The esp_http_client auth type * * @return * - ESP_OK * - ESP_ERR_INVALID_ARG */ esp_err_t esp_http_client_set_authtype(esp_http_client_handle_t client, esp_http_client_auth_type_t auth_type); /** * @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); /** * @brief Helper API to read larger data chunks * This is a helper API which internally calls `esp_http_client_read` multiple times till the end of data is reached or till the buffer gets full. * * @param[in] client The esp_http_client handle * @param buffer The buffer * @param[in] len The buffer length * * @return * - Length of data was read */ int esp_http_client_read_response(esp_http_client_handle_t client, char *buffer, int len); /** * @brief Process all remaining response data * This uses an internal buffer to repeatedly receive, parse, and discard response data until complete data is processed. * As no additional user-supplied buffer is required, this may be preferrable to `esp_http_client_read_response` in situations where the content of the response may be ignored. * * @param[in] client The esp_http_client handle * @param len Length of data discarded * * @return * - ESP_OK If successful, len will have discarded length * - ESP_FAIL If failed to read response * - ESP_ERR_INVALID_ARG If the client is NULL */ esp_err_t esp_http_client_flush_response(esp_http_client_handle_t client, int *len); /** * @brief Get URL from client * * @param[in] client The esp_http_client handle * @param[inout] url The buffer to store URL * @param[in] len The buffer length * * @return * - ESP_OK * - ESP_FAIL */ esp_err_t esp_http_client_get_url(esp_http_client_handle_t client, char *url, const int len); /** * @brief Get Chunk-Length from client * * @param[in] client The esp_http_client handle * @param[out] len Variable to store length * * @return * - ESP_OK If successful, len will have length of current chunk * - ESP_FAIL If the server is not a chunked server * - ESP_ERR_INVALID_ARG If the client or len are NULL */ esp_err_t esp_http_client_get_chunk_length(esp_http_client_handle_t client, int *len); #ifdef __cplusplus } #endif #endif