// 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 __HTTP_CLIENT_H__ #define __HTTP_CLIENT_H__ #include #include #ifdef __cplusplus extern "C" { #endif #define DEFAULT_HTTP_BUF_SIZE (512) typedef struct http_client *http_client_handle_t; typedef struct http_client_event *http_client_event_handle_t; typedef enum { HTTP_CLI_OK = 0, HTTP_CLI_FAIL = -1, HTTP_CLI_ERR_NO_MEM = 0x101, /*!< Out of memory */ HTTP_CLI_ERR_INVALID_ARG = 0x102, /*!< Invalid argument */ HTTP_CLI_ERR_INVALID_STATE = 0x103, /*!< Invalid state */ HTTP_CLI_ERR_INVALID_SIZE = 0x104, /*!< Invalid size */ HTTP_CLI_ERR_NOT_FOUND = 0x105, /*!< Requested resource not found */ HTTP_CLI_ERR_NOT_SUPPORTED = 0x106, /*!< Operation or feature not supported */ HTTP_CLI_ERR_TIMEOUT = 0x107, /*!< Operation timed out */ HTTP_CLI_ERR_INVALID_RESPONSE = 0x108, /*!< Received response was invalid */ HTTP_CLI_ERR_INVALID_CRC = 0x109, /*!< CRC or checksum was invalid */ HTTP_CLI_ERR_INVALID_VERSION = 0x10A, /*!< Version was invalid */ HTTP_CLI_ERR_INVALID_MAC = 0x10B /*!< MAC address was invalid */ } http_errors_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_HEADER_SENT, /*!< After sending all the headers to the server */ 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 */ } http_client_event_id_t; /** * @brief HTTP Client events data */ typedef struct http_client_event { http_client_event_id_t event_id; /*!< event_id, to know the cause of the event */ http_client_handle_t client; /*!< 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 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 */ } 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 */ } http_client_transport_t; typedef int (*http_event_handle_cb)(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, } 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 */ } 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 http_client_transport_t (80 or 443) */ const char *username; /*!< Using for Http authentication */ const char *password; /*!< Using for Http authentication */ http_client_auth_type_t auth_type; /*!< Http authentication type, see `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 */ 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 */ http_client_transport_t transport_type; /*!< HTTP transport type, see `http_client_transport_t` */ int buffer_size; /*!< HTTP buffer size (both send and receive) */ 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. */ } http_client_config_t; /** * Enum for the HTTP status codes. */ typedef enum { /* 3xx - Redirection */ 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; /** * @brief Start a HTTP session * This function must be the first function to call, * and it returns a http_client_handle_t that you must use as input to other functions in the interface. * This call MUST have a corresponding call to http_client_cleanup when the operation is complete. * * @param[in] config The configurations, see `http_client_config_t` * * @return * - `http_client_handle_t` * - NULL if any errors */ http_client_handle_t http_client_init(const http_client_config_t *config); /** * @brief Invoke this function after `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 http_client_handle_t as input as the http_client_init call returned. * 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 http_client_perform(), `is_async` member of http_client_config_t * must be set while making a call to http_client_init() API. * You can do any amount of calls to http_client_perform while using the same 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. * 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 `http_client_set_**` between the invokes to set options for the following 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 http_client_handle_t. * This function include `http_client_open` -> `http_client_write` -> `http_client_fetch_headers` -> `http_client_read` (and option) `http_client_close`. * * @param client The http_client handle * * @return * - HTTP_CLI_OK on successful * - HTTP_CLI_FAIL on error */ http_errors_t http_client_perform(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 http_client handle * @param[in] url The url * * @return * - HTTP_CLI_OK * - HTTP_CLI_FAIL */ http_errors_t http_client_set_url(http_client_handle_t client, const char *url); /** * @brief Set post data, this function must be called before `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 http_client handle * @param[in] data post data pointer * @param[in] len post length * * @return * - HTTP_CLI_OK * - HTTP_CLI_FAIL */ http_errors_t http_client_set_post_field(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 http_client_get_post_field(http_client_handle_t client, char **data); /** * @brief Set http request header, this function must be called after http_client_init and before any * perform function * * @param[in] client The http_client handle * @param[in] key The header key * @param[in] value The header value * * @return * - HTTP_CLI_OK * - HTTP_CLI_FAIL */ http_errors_t http_client_set_header(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 `http_client_init`. * * @param[in] client The http_client handle * @param[in] key The header key * @param[out] value The header value * * @return * - HTTP_CLI_OK * - HTTP_CLI_FAIL */ http_errors_t http_client_get_header(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 `http_client_init`. * * @param[in] client The http_client handle * @param[out] value The username value * * @return * - HTTP_CLI_OK * - HTTP_CLI_ERR_INVALID_ARG */ http_errors_t http_client_get_username(http_client_handle_t client, char **value); /** * @brief Get http request password. * The address of password buffer will be assigned to value parameter. * This function must be called after `http_client_init`. * * @param[in] client The http_client handle * @param[out] value The password value * * @return * - HTTP_CLI_OK * - HTTP_CLI_ERR_INVALID_ARG */ http_errors_t http_client_get_password(http_client_handle_t client, char **value); /** * @brief Set http request method * * @param[in] client The http_client handle * @param[in] method The method * * @return * - HTTP_CLI_OK * - HTTP_CLI_ERR_INVALID_ARG */ http_errors_t http_client_set_method(http_client_handle_t client, http_client_method_t method); /** * @brief Delete http request header * * @param[in] client The http_client handle * @param[in] key The key * * @return * - HTTP_CLI_OK * - HTTP_CLI_FAIL */ http_errors_t http_client_delete_header(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 http_client handle * @param[in] write_len HTTP Content length need to write to the server * * @return * - HTTP_CLI_OK * - HTTP_CLI_FAIL */ http_errors_t http_client_open(http_client_handle_t client, int write_len); /** * @brief This function will write data to the HTTP connection previously opened by http_client_open() * * @param[in] client The http_client handle * @param buffer The buffer * @param[in] len This value must not be larger than the write_len parameter provided to http_client_open() * * @return * - (-1) if any errors * - Length of data written */ int http_client_write(http_client_handle_t client, const char *buffer, int len); /** * @brief This function need to call after http_client_open, it will read from http stream, process all receive headers * * @param[in] client The http_client handle * * @return * - (0) if stream doesn't contain content-length header, or chunked encoding (checked by `http_client_is_chunked` response) * - (-1: HTTP_CLI_FAIL) if any errors * - Download data length defined by content-length header */ int http_client_fetch_headers(http_client_handle_t client); /** * @brief Check response data is chunked * * @param[in] client The http_client handle * * @return true or false */ bool http_client_is_chunked_response(http_client_handle_t client); /** * @brief Read data from http stream * * @param[in] client The http_client handle * @param buffer The buffer * @param[in] len The length * * @return * - (-1) if any errors * - Length of data was read */ int http_client_read(http_client_handle_t client, char *buffer, int len); /** * @brief Get http response status code, the valid value if this function invoke after `http_client_perform` * * @param[in] client The http_client handle * * @return Status code */ int http_client_get_status_code(http_client_handle_t client); /** * @brief Get http response content length (from header Content-Length) * the valid value if this function invoke after `http_client_perform` * * @param[in] client The http_client handle * * @return * - (-1) Chunked transfer * - Content-Length value as bytes */ int http_client_get_content_length(http_client_handle_t client); /** * @brief Close http connection, still kept all http request resources * * @param[in] client The http_client handle * * @return * - HTTP_CLI_OK * - HTTP_CLI_FAIL */ http_errors_t http_client_close(http_client_handle_t client); /** * @brief This function must be the last function to call for an session. * It is the opposite of the http_client_init function and must be called with the same handle as input that a 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 http_client. * * @param[in] client The http_client handle * * @return * - HTTP_CLI_OK * - HTTP_CLI_FAIL */ http_errors_t http_client_cleanup(http_client_handle_t client); /** * @brief Get transport type * * @param[in] client The http_client handle * * @return * - HTTP_TRANSPORT_UNKNOWN * - HTTP_TRANSPORT_OVER_TCP * - HTTP_TRANSPORT_OVER_SSL */ http_client_transport_t http_client_get_transport_type(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 http_client handle * * @return * - HTTP_CLI_OK * - HTTP_CLI_FAIL */ http_errors_t http_client_set_redirection(http_client_handle_t client); /** * @brief Checks if entire data in the response has been read without any error. * * @param[in] client The http_client handle * * @return * - true * - false */ bool http_client_is_complete_data_received(http_client_handle_t client); /** * @brief Helper API to read larger data chunks * This is a helper API which internally calls `http_client_read` multiple times till the end of data is reached or till the buffer gets full. * * @param[in] client The http_client handle * @param buffer The buffer * @param[in] len The buffer length * * @return * - Length of data was read */ int http_client_read_response(http_client_handle_t client, char *buffer, int len); #ifdef __cplusplus } #endif #endif