add: OPTIONS method support

add: relay tag endpoint

endpoints/api_v1_relays_tag_STR.c

@@ -0,0 +1,57 @@
+#include <cJSON.h>
+#include <constants.h>
+#include <endpoints/api_v1_relays.h>
+#include <logger.h>
+#include <models/junction_tag.h>
+#include <models/relay.h>
+#include <models/tag.h>
+
+void
+api_v1_relays_tag_STR_GET(struct mg_connection *c, endpoint_args_t *args, struct http_message *hm)
+{
+    (void)hm;
+
+    int tag_id = tag_get_id(args[0].value.v_str);
+    int *relays_ids = junction_tag_get_relays_for_tag_id(tag_id);
+    if(relays_ids == NULL)
+    {
+        LOG_ERROR("failed to print relays json\n");
+        mg_send_head(c, 500, 2, "Content-Type: application/json\r\n" STANDARD_HEADERS);
+        mg_printf(c, "[]");
+        return;
+    }
+
+    cJSON *json = cJSON_CreateArray();
+
+    for(int i = 0; relays_ids[i] != 0; ++i)
+    {
+        relay_t* relay = relay_get_by_id(relays_ids[i]);
+
+        if(!relay)
+        {
+            continue;
+        }
+        cJSON *json_relay = relay_to_json(relay);
+
+        cJSON_AddItemToArray(json, json_relay);
+
+        relay_free(relay);
+    }
+
+    char *json_str = cJSON_Print(json);
+    if (json_str == NULL)
+    {
+        LOG_ERROR("failed to print relays json\n");
+        mg_send_head(c, 500, 2, "Content-Type: application/json\r\n" STANDARD_HEADERS);
+        mg_printf(c, "[]");
+    }
+    else
+    {
+        mg_send_head(c, 200, strlen(json_str), "Content-Type: application/json\r\n" STANDARD_HEADERS);
+        mg_printf(c, "%s", json_str);
+        free(json_str);
+    }
+
+    cJSON_Delete(json);
+    free(relays_ids);
+}

handlers/connection.c

@@ -1,3 +1,4 @@
+#include <constants.h>
 #include <mongoose.h>
 #include <logger.h>
 #include <router.h>
@@ -13,7 +14,7 @@ handler_connection(struct mg_connection *c, int ev, void *p)
 
         endpoint_t *endpoint = router_find_endpoint(hm->uri.p, hm->uri.len, &hm->method);
 
-        if(endpoint && endpoint->func)
+        if(endpoint)
         {
             if(endpoint->func)
             {
@@ -28,10 +29,24 @@ handler_connection(struct mg_connection *c, int ev, void *p)
                 }
             }
             else
+            {
+                if(endpoint->method == HTTP_METHOD_OPTIONS)
+                {
+                    char options_header[256]; // TODO make more generic
+                    sprintf(options_header, "Allow: OPTIONS%s%s%s%s\r\n" STANDARD_HEADERS,
+                            endpoint->options & HTTP_METHOD_GET ? ", GET" : "",
+                            endpoint->options & HTTP_METHOD_POST ? ", POST" : "",
+                            endpoint->options & HTTP_METHOD_PUT ? ", PUT" : "",
+                            endpoint->options & HTTP_METHOD_DELETE ? ", DELETE" : ""
+                    );
+                    mg_send_head(c, 204, 0, options_header);
+                }
+                else
                 {
                     mg_send_head(c, 501, 0, "Content-Type: text/plain");
                 }
             }
+        }
         else
         {
             mg_send_head(c, 500, 0, "Content-Type: text/plain");

include/endpoints/api_v1_relays.h

@@ -6,4 +6,7 @@
 void
 api_v1_relays_GET(struct mg_connection *c, endpoint_args_t *args, struct http_message *hm);
 
+void
+api_v1_relays_tag_STR_GET(struct mg_connection *c, endpoint_args_t *args, struct http_message *hm);
+
 #endif /* CORE_ENDPOINTS_API_V1_RELAYS_H */

include/router.h

@@ -3,7 +3,7 @@
 
 #include <mongoose.h>
 
-#define ENDPOINTS_MAX_COUNT 16
+#define ENDPOINTS_MAX_COUNT 128
 
 typedef enum
 {
@@ -11,6 +11,15 @@ typedef enum
     ENDPOINT_ARG_TYPE_STR
 } endpoint_arg_type_e;
 
+typedef enum
+{
+    HTTP_METHOD_GET     = (1 << 0),
+    HTTP_METHOD_POST    = (1 << 1),
+    HTTP_METHOD_PUT     = (1 << 2),
+    HTTP_METHOD_DELETE  = (1 << 3),
+    HTTP_METHOD_OPTIONS = (1 << 4)
+} http_method_e;
+
 typedef struct
 {
     endpoint_arg_type_e type;
@@ -25,10 +34,13 @@ typedef void (*endpoint_func_f)(struct mg_connection *c, endpoint_args_t *args,
 
 typedef struct
 {
+    const char *full_route;
     char **route;
     char *route_keeper;
-    int methods;
+    int method;
+    int options;
     endpoint_func_f func;
+    int trailing_slash;
 
     int args_count;
     endpoint_args_t *args;
@@ -40,11 +52,11 @@ typedef struct
 void
 router_init();
 
-void
-router_register_endpoint(const char *route, int methods, endpoint_func_f func);
+endpoint_t*
+router_register_endpoint(const char *route, int method, endpoint_func_f func);
 
 endpoint_t*
-router_find_endpoint(const char *uri_str, size_t uri_len, struct mg_str *method);
+router_find_endpoint(const char *uri_str, size_t uri_len, struct mg_str *method_str);
 
 void
 router_free();

router.c

@@ -7,12 +7,6 @@
 #include <endpoints/api_v1_controllers.h>
 #include <endpoints/api_v1_relays.h>
 
-static const int HTTP_METHOD_GET     = (1 << 0);
-static const int HTTP_METHOD_POST    = (1 << 1);
-static const int HTTP_METHOD_PUT     = (1 << 2);
-static const int HTTP_METHOD_DELETE  = (1 << 3);
-static const int HTTP_METHOD_OPTIONS = (1 << 4);
-
 static endpoint_t endpoints[ENDPOINTS_MAX_COUNT];
 static endpoint_t endpoint_index;
 static endpoint_t endpoint_not_found;
@@ -37,29 +31,55 @@ endpoint_not_found_func(struct mg_connection *c, endpoint_args_t *args, struct h
     mg_printf(c, "not found");
 }
 
+static struct mg_str
+get_method_str_for_int(int method_int)
+{
+    if(method_int == HTTP_METHOD_GET)
+    {
+        return mg_mk_str("GET");
+    }
+    if(method_int == HTTP_METHOD_POST)
+    {
+        return mg_mk_str("POST");
+    }
+    if(method_int == HTTP_METHOD_PUT)
+    {
+        return mg_mk_str("PUT");
+    }
+    if(method_int == HTTP_METHOD_DELETE)
+    {
+        return mg_mk_str("DELETE");
+    }
+    if(method_int == HTTP_METHOD_OPTIONS)
+    {
+        return mg_mk_str("OPTIONS");
+    }
+    return mg_mk_str("GET");
+}
+
 void
 router_init()
 {
     // add index endpoint
     endpoint_index.route = NULL;
     endpoint_index.func = endpoint_index_func;
-    endpoint_index.methods = 0;
+    endpoint_index.method = 0;
     endpoint_index.args_count = 0;
     endpoint_index.args = NULL;
 
     // add 404 endpoint
     endpoint_not_found.route = NULL;
     endpoint_not_found.func = endpoint_not_found_func;
-    endpoint_not_found.methods = 0;
+    endpoint_not_found.method = 0;
     endpoint_not_found.args_count = 0;
     endpoint_not_found.args = NULL;
 
     router_register_endpoint("/api/v1/schedules/", HTTP_METHOD_GET, api_v1_schedules_GET);
     router_register_endpoint("/api/v1/schedules/", HTTP_METHOD_POST, api_v1_schedules_POST);
-    router_register_endpoint("/api/v1/schedules/{str}/", HTTP_METHOD_GET, api_v1_schedules_STR_GET);
-    router_register_endpoint("/api/v1/schedules/{str}/", HTTP_METHOD_PUT, api_v1_schedules_STR_PUT);
-    router_register_endpoint("/api/v1/schedules/{str}/", HTTP_METHOD_DELETE, api_v1_schedules_STR_DELETE);
-    router_register_endpoint("/api/v1/schedules/tag/{str}/", HTTP_METHOD_GET, api_v1_schedules_tag_STR_GET);
+    router_register_endpoint("/api/v1/schedules/{str}", HTTP_METHOD_GET, api_v1_schedules_STR_GET);
+    router_register_endpoint("/api/v1/schedules/{str}", HTTP_METHOD_PUT, api_v1_schedules_STR_PUT);
+    router_register_endpoint("/api/v1/schedules/{str}", HTTP_METHOD_DELETE, api_v1_schedules_STR_DELETE);
+    router_register_endpoint("/api/v1/schedules/tag/{str}", HTTP_METHOD_GET, api_v1_schedules_tag_STR_GET);
 
     router_register_endpoint("/api/v1/controllers/discover/", HTTP_METHOD_POST, api_v1_controllers_discover_POST);
     router_register_endpoint("/api/v1/controllers/", HTTP_METHOD_GET, api_v1_controllers_GET);
@@ -72,19 +92,38 @@ router_init()
     router_register_endpoint("/api/v1/controllers/{str}/relays/{int}", HTTP_METHOD_PUT, api_v1_controllers_STR_relays_INT_PUT);
 
     router_register_endpoint("/api/v1/relays/", HTTP_METHOD_GET, api_v1_relays_GET);
+    router_register_endpoint("/api/v1/relays/tag/{str}", HTTP_METHOD_GET, api_v1_relays_tag_STR_GET);
 }
 
-void
-router_register_endpoint(const char *route, int methods, endpoint_func_f func)
+endpoint_t*
+router_register_endpoint(const char *route, int method, endpoint_func_f func)
 {
+    endpoint_t *options_endpoint = NULL;
+    if(method != HTTP_METHOD_OPTIONS)
+    {
+        struct mg_str method_str = get_method_str_for_int(HTTP_METHOD_OPTIONS);
+        options_endpoint = router_find_endpoint(route, strlen(route), &method_str);
+        if(options_endpoint == &endpoint_not_found)
+        {
+            options_endpoint = router_register_endpoint(route, HTTP_METHOD_OPTIONS, NULL);
+        }
+    }
+
     if(endpoints_registered >= ENDPOINTS_MAX_COUNT)
     {
         LOG_ERROR("can't register more than %d endpoints\n", ENDPOINTS_MAX_COUNT);
-        return;
+        return NULL;
     }
 
     endpoint_t *endpoint = &endpoints[endpoints_registered];
 
+    endpoint->full_route = route;
+    endpoint->trailing_slash = 0; // unused because trailing slashes are optional. TODO make option
+    if(route[strlen(route)] == delimiter[0])
+    {
+        endpoint->trailing_slash = 1;
+    }
+
     int route_parts_count = 1;
     size_t route_len = strlen(route);
 
@@ -130,8 +169,16 @@ router_register_endpoint(const char *route, int methods, endpoint_func_f func)
     }
 
     endpoint->func = func;
-    endpoint->methods = methods;
+    endpoint->method = method;
+    endpoint->options = 0;
+
+    if(options_endpoint)
+    {
+        options_endpoint->options |= method;
+    }
+
     ++endpoints_registered;
+    return endpoint;
 }
 
 static int
@@ -163,8 +210,6 @@ get_method_int_for_str(struct mg_str *method_str)
 endpoint_t*
 router_find_endpoint(const char *uri_str, size_t uri_len, struct mg_str *method_str)
 {
-    (void)uri_str;
-    (void)uri_len;
     char *uri = malloc(sizeof(char) * (uri_len + 1));
     strncpy(uri, uri_str, uri_len);
     uri[uri_len] = '\0';
@@ -173,7 +218,7 @@ router_find_endpoint(const char *uri_str, size_t uri_len, struct mg_str *method_
 
     for(int i = 0; i < endpoints_registered; ++i)
     {
-        if(endpoints[i].methods & method)
+        if(endpoints[i].method & method)
         {
             endpoints[i].possible_route = 1;
         }