libimcv: Moved REST API from imv_swid and imv_swima to libimcv

2017-07-08 23:19:51 +02:00
parent 7e796bba67
commit 8ba6bf511e
10 changed files with 114 additions and 241 deletions
@@ -0,0 +1,167 @@
+/*
+ * Copyright (C) 2017 Andreas Steffen
+ * HSR Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#ifdef USE_JSON
+
+#define _GNU_SOURCE
+#include <stdio.h>
+
+#include "rest.h"
+
+typedef struct private_rest_t private_rest_t;
+
+/**
+ * Private data of an rest_t object.
+ */
+struct private_rest_t {
+
+	/**
+	 * Public members of rest_t
+	 */
+	rest_t public;
+
+	/**
+	 * URI of REST API
+	 */
+	char *uri;
+
+	/**
+	 * Timeout of REST API connection
+	 */
+	u_int timeout;
+
+};
+
+METHOD(rest_t, get, status_t,
+	private_rest_t *this, char *command, json_object **jresponse)
+{
+	struct json_tokener *tokener;
+	chunk_t response = chunk_empty;
+	status_t status;
+	char *uri;
+
+	if (asprintf(&uri, "%s%s",this->uri, command) < 0)
+	{
+		return FAILED;
+	}
+
+	status = lib->fetcher->fetch(lib->fetcher, uri, &response,
+				FETCH_TIMEOUT, this->timeout,
+				FETCH_END);
+	free(uri);
+
+	if (status == SUCCESS && jresponse)
+	{
+		/* Parse HTTP response into a JSON object */
+		tokener = json_tokener_new();
+		*jresponse = json_tokener_parse_ex(tokener, response.ptr, response.len);
+		json_tokener_free(tokener);
+	}
+	free(response.ptr);
+
+	return status;
+}
+
+#define HTTP_STATUS_CODE_NOT_FOUND				404
+#define HTTP_STATUS_CODE_PRECONDITION_FAILED	412
+
+METHOD(rest_t, post, status_t,
+	private_rest_t *this, char *command, json_object *jrequest,
+	json_object **jresponse)
+{
+	struct json_tokener *tokener;
+	chunk_t data, response = chunk_empty;
+	status_t status;
+	char *uri;
+	int code;
+
+	if (asprintf(&uri, "%s%s",this->uri, command) < 0)
+	{
+		return FAILED;
+	}
+	data = chunk_from_str((char*)json_object_to_json_string(jrequest));
+
+	status = lib->fetcher->fetch(lib->fetcher, uri, &response,
+				FETCH_TIMEOUT, this->timeout,
+				FETCH_REQUEST_DATA, data,
+				FETCH_REQUEST_TYPE, "application/json; charset=utf-8",
+				FETCH_REQUEST_HEADER, "Accept: application/json",
+				FETCH_REQUEST_HEADER, "Expect:",
+				FETCH_RESPONSE_CODE, &code,
+				FETCH_END);
+	free(uri);
+
+	if (status != SUCCESS)
+	{
+		switch (code)
+		{
+			case HTTP_STATUS_CODE_NOT_FOUND:
+				status = NOT_FOUND;
+				break;
+			case HTTP_STATUS_CODE_PRECONDITION_FAILED:
+				if (!response.ptr)
+				{
+					return FAILED;
+				}
+				if (jresponse)
+				{
+					/* Parse HTTP response into a JSON object */
+					tokener = json_tokener_new();
+					*jresponse = json_tokener_parse_ex(tokener, response.ptr,
+																response.len);
+					json_tokener_free(tokener);
+				}
+				status = NEED_MORE;
+				break;
+			default:
+				DBG2(DBG_IMV, "REST http request failed with status code: %d",
+							   code);
+				status = FAILED;
+				break;
+		}
+	}
+	free(response.ptr);
+
+	return status;
+}
+
+METHOD(rest_t, destroy, void,
+	private_rest_t *this)
+{
+	free(this->uri);
+	free(this);
+}
+
+/**
+ * Described in header.
+ */
+rest_t *rest_create(char *uri, u_int timeout)
+{
+	private_rest_t *this;
+
+	INIT(this,
+		.public = {
+			.get = _get,
+			.post = _post,
+			.destroy = _destroy,
+		},
+		.uri = strdup(uri),
+		.timeout = timeout,
+	);
+
+	return &this->public;
+}
+
+#endif /* USE_JSON */
@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2017 Andreas Steffen
+ * HSR Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup imv_swima imv_swima
+ * @ingroup libimcv_plugins
+ *
+ * @defgroup rest_t rest
+ * @{ @ingroup imv_swima
+ */
+
+#ifndef REST_H_
+#define REST_H_
+
+#ifdef USE_JSON
+
+#include <library.h>
+#include <json.h>
+
+typedef struct rest_t rest_t;
+
+/**
+ * Public REST interface
+ */
+struct rest_t {
+
+	/**
+	 * Send an HTTP GET request returning a JSON object
+	 *
+	 * @param jresp		JSON object in HTTP
+	 * @return			Status (SUCCESS or FAILED)
+	 */
+	status_t (*get)(rest_t *this, char *command, json_object **jresp);
+
+	/**
+	 * Send an HTTP POST request including a JSON object
+	 *
+	 * @param jreq		JSON object in HTTP request
+	 * @param jresp		JSON object in HTTP response if NEED_MORE
+	 * @return			Status (SUCCESS, NEED_MORE or FAILED)
+	 */
+	status_t (*post)(rest_t *this, char *command, json_object *jreq,
+					 json_object **jresp);
+
+	/**
+	 * Destroy rest_t object
+	 */
+	void (*destroy)(rest_t *this);
+
+};
+
+/**
+ * Create an rest_t instance
+ *
+ * @param uri			REST URI (http://username:password@hostname[:port]/api/)
+ * @param timeout		Timeout of the REST connection
+ */
+rest_t* rest_create(char *uri, u_int timeout);
+
+#endif /* USE_JSON */
+
+#endif /** REST_H_ @}*/