#include "common.h"
#include "sensor.h"
-#include "log.h"
+#include "control.h"
#include "options.h"
-#define LOGIN_TIMEOUT 180
+#define CONTROL_TIMEOUT 180
struct FCGIContext {
- /**The time of last valid logged-in user access*/
- time_t login_timestamp;
- char login_key[41];
- char login_ip[16];
+ /**The time of last valid user access possessing the control key*/
+ time_t control_timestamp;
+ char control_key[41];
+ char control_ip[16];
/**The name of the current module**/
const char *current_module;
/**For debugging purposes?**/
};
/**
- * Handles user logins.
- * @param context The context to work in
- * @param params User specified parameters
- */
-static void LoginHandler(FCGIContext *context, char *params) {
- const char *key, *value;
- bool force = 0, end = 0;
-
- while ((params = FCGI_KeyPair(params, &key, &value))) {
- if (!strcmp(key, "force"))
- force = !force;
- else if (!strcmp(key, "end"))
- end = !end;
- }
-
- if (end) {
- *(context->login_key) = 0;
- FCGI_BeginJSON(context, STATUS_OK);
- FCGI_EndJSON();
- return;
- }
+ * Identifies current version info. Useful for testing that the API is running.
+ * TODO - Consider adding info about available sensors and actuators (eg capabilities)?
+ */
+static void IdentifyHandler(FCGIContext *context, char *params) {
+ FCGI_BeginJSON(context, STATUS_OK);
+ FCGI_JSONPair("description", "MCTX3420 Server API (2013)");
+ FCGI_JSONPair("build_date", __DATE__ " " __TIME__);
+ FCGI_EndJSON();
+}
+/**
+ * Gives the user a key that determines who has control over
+ * the system at any one time. The key can be forcibly generated, revoking
+ * any previous control keys. To be used in conjunction with HTTP
+ * basic authentication.
+ * This function will generate a JSON response that indicates success/failure.
+ * @param context The context to work in
+ * @param force Whether to force key generation or not.
+ */
+void FCGI_BeginControl(FCGIContext *context, bool force) {
time_t now = time(NULL);
- if (force || !*(context->login_key) ||
- (now - context->login_timestamp > LOGIN_TIMEOUT))
- {
+ bool expired = now - context->control_timestamp > CONTROL_TIMEOUT;
+
+ if (force || !*(context->control_key) || expired) {
SHA_CTX sha1ctx;
unsigned char sha1[20];
int i = rand();
SHA1_Update(&sha1ctx, &i, sizeof(i));
SHA1_Final(sha1, &sha1ctx);
- context->login_timestamp = now;
+ context->control_timestamp = now;
for (i = 0; i < 20; i++)
- sprintf(context->login_key + i * 2, "%02x", sha1[i]);
- snprintf(context->login_ip, 16, "%s", getenv("REMOTE_ADDR"));
+ sprintf(context->control_key + i * 2, "%02x", sha1[i]);
+ snprintf(context->control_ip, 16, "%s", getenv("REMOTE_ADDR"));
FCGI_BeginJSON(context, STATUS_OK);
- FCGI_JSONPair("key", context->login_key);
- FCGI_EndJSON();
+ FCGI_JSONPair("key", context->control_key);
+ FCGI_EndJSON();
} else {
char buf[128];
strftime(buf, 128, "%H:%M:%S %d-%m-%Y",
- localtime(&(context->login_timestamp)));
- FCGI_BeginJSON(context, STATUS_UNAUTHORIZED);
- FCGI_JSONPair("description", "Already logged in");
- FCGI_JSONPair("user", context->login_ip);
- FCGI_JSONPair("time", buf);
- FCGI_EndJSON();
- }
-}
-
-/*TODO: Remove and replace with the actual actuator code*/
-static void ActuatorHandler(FCGIContext *context, char *params) {
- const char *key, *value, *loginkey = NULL;
- while ((params = FCGI_KeyPair(params, &key, &value))) {
- if (!strcmp(key, "key")) {
- loginkey = value;
- }
- }
- if (!loginkey || !FCGI_Authorized(context, loginkey)) {
+ localtime(&(context->control_timestamp)));
FCGI_BeginJSON(context, STATUS_UNAUTHORIZED);
- FCGI_JSONPair("description", "Invalid key specified.");
- FCGI_EndJSON();
- } else {
- FCGI_BeginJSON(context, STATUS_OK);
- FCGI_JSONPair("description", "Logged in!");
+ FCGI_JSONPair("description", "Another user already has control");
+ FCGI_JSONPair("current_user", context->control_ip);
+ FCGI_JSONPair("when", buf);
FCGI_EndJSON();
}
}
/**
* Given an FCGIContext, determines if the current user (as specified by
- * the key) is authorized or not. If validated, the context login_timestamp is
+ * the key) has control or not. If validated, the context control_timestamp is
* updated.
* @param context The context to work in
- * @param key The login key to be validated.
+ * @param key The control key to be validated.
* @return TRUE if authorized, FALSE if not.
*/
-bool FCGI_Authorized(FCGIContext *context, const char *key) {
+bool FCGI_HasControl(FCGIContext *context, const char *key) {
time_t now = time(NULL);
- int result = (now - context->login_timestamp) <= LOGIN_TIMEOUT &&
- !strcmp(context->login_key, key);
+ int result = (now - context->control_timestamp) <= CONTROL_TIMEOUT &&
+ key != NULL && !strcmp(context->control_key, key);
if (result) {
- context->login_timestamp = now; //Update the login_timestamp
+ context->control_timestamp = now; //Update the control_timestamp
}
return result;
}
+
+/**
+ * Revokes the current control key, if present.
+ * @param context The context to work in
+ */
+void FCGI_EndControl(FCGIContext *context) {
+ *(context->control_key) = 0;
+ FCGI_BeginJSON(context, STATUS_OK);
+ FCGI_EndJSON();
+ return;
+}
+
/**
* Extracts a key/value pair from a request string.
* Note that the input is modified by this function.
printf(",\r\n\t\"%s\" : %f", key, value);
}
+/**
+ * Similar to FCGI_JsonPair except for boolean values.
+ * @param key The key of the JSON entry
+ * @param value The value associated with the key
+ */
+void FCGI_JSONBool(const char *key, bool value)
+{
+ printf(",\r\n\t\"%s\" : %s", key, value ? "true" : "false");
+}
+
/**
* Begins a JSON entry by writing the key. To be used in conjunction
* with FCGI_JsonValue.
}
/**
- * To be used when the input parameters are invalid.
- * Sends a response with HTTP status 400 Bad request, along with
- * JSON data for debugging.
+ * To be used when the input parameters are invalid. The return data will
+ * have a status of STATUS_ERROR, along with other debugging information.
* @param context The context to work in
- * @param params The parameters that the module handler received.
*/
void FCGI_RejectJSON(FCGIContext *context)
{
- printf("Status: 400 Bad Request\r\n");
+ FCGI_RejectJSONEx(context, STATUS_ERROR, "Invalid request");
+}
+
+/**
+ * To be used when the input parameters are rejected. The return data
+ * will also have debugging information provided.
+ * @param context The context to work in
+ * @param status The status the return data should have.
+ * @param description A short description of why the input was rejected.
+ * @param params The parameters that the module handler received.
+ */
+void FCGI_RejectJSONEx(FCGIContext *context, StatusCodes status, const char *description)
+{
+ description = !description ? "" : description;
- FCGI_BeginJSON(context, STATUS_ERROR);
- FCGI_JSONPair("description", "Invalid request");
+ Log(LOGINFO, "%s: Rejected query with: %d: %s", context->current_module, status, description);
+ FCGI_BeginJSON(context, status);
+ FCGI_JSONPair("description", description);
FCGI_JSONLong("responsenumber", context->response_number);
- FCGI_JSONPair("params", getenv("DOCUMENT_URI_LOCAL"));
+ FCGI_JSONPair("params", getenv("QUERY_STRING"));
FCGI_JSONPair("host", getenv("SERVER_HOSTNAME"));
FCGI_JSONPair("user", getenv("REMOTE_USER"));
FCGI_JSONPair("ip", getenv("REMOTE_ADDR"));
FCGI_EndJSON();
}
+
/**
* Main FCGI request loop that receives/responds to client requests.
* @param data Reserved.
if (lastchar > 0 && module[lastchar] == '/')
module[lastchar] = 0;
-
- if (!strcmp("login", module)) {
- module_handler = LoginHandler;
+ if (!*module || !strcmp("identify", module)) {
+ module_handler = IdentifyHandler;
+ } else if (!strcmp("control", module)) {
+ module_handler = Control_Handler;
} else if (!strcmp("sensors", module)) {
module_handler = Sensor_Handler;
- } else if (!strcmp("actuators", module)) {
- module_handler = ActuatorHandler;
}
context.current_module = module;
if (module_handler) {
module_handler(&context, params);
} else {
- strncat(module, " [unknown]", BUFSIZ);
+ strncat(module, " (unhandled)", BUFSIZ);
FCGI_RejectJSON(&context);
}
context.response_number++;
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