telodendria/Cytoplasm/src/HttpRouter.c

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/*
* Copyright (C) 2022-2023 Jordan Bancino <@jordan:bancino.net>
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <HttpRouter.h>
#include <Memory.h>
#include <HashMap.h>
#include <Str.h>
#include <regex.h>
#include <string.h>
#define REG_FLAGS (REG_EXTENDED)
#define REG_MAX_SUB 8
typedef struct RouteNode
{
HttpRouteFunc *exec;
HashMap *children;
regex_t regex;
} RouteNode;
struct HttpRouter
{
RouteNode *root;
};
static RouteNode *
RouteNodeCreate(char *regex, HttpRouteFunc * exec)
{
RouteNode *node;
if (!regex)
{
return NULL;
}
node = Malloc(sizeof(RouteNode));
if (!node)
{
return NULL;
}
node->children = HashMapCreate();
if (!node->children)
{
Free(node);
return NULL;
}
/* Force the regex to match the entire path part exactly. */
regex = StrConcat(3, "^", regex, "$");
if (!regex)
{
Free(node);
return NULL;
}
if (regcomp(&node->regex, regex, REG_FLAGS) != 0)
{
HashMapFree(node->children);
Free(node);
Free(regex);
return NULL;
}
node->exec = exec;
Free(regex);
return node;
}
static void
RouteNodeFree(RouteNode * node)
{
char *key;
RouteNode *val;
if (!node)
{
return;
}
while (HashMapIterate(node->children, &key, (void **) &val))
{
RouteNodeFree(val);
}
HashMapFree(node->children);
regfree(&node->regex);
Free(node);
}
HttpRouter *
HttpRouterCreate(void)
{
HttpRouter *router = Malloc(sizeof(HttpRouter));
if (!router)
{
return NULL;
}
router->root = RouteNodeCreate("/", NULL);
return router;
}
void
HttpRouterFree(HttpRouter * router)
{
if (!router)
{
return;
}
RouteNodeFree(router->root);
Free(router);
}
int
HttpRouterAdd(HttpRouter * router, char *regPath, HttpRouteFunc * exec)
{
RouteNode *node;
char *pathPart;
char *tmp;
if (!router || !regPath || !exec)
{
return 0;
}
if (StrEquals(regPath, "/"))
{
router->root->exec = exec;
return 1;
}
regPath = StrDuplicate(regPath);
if (!regPath)
{
return 0;
}
tmp = regPath;
node = router->root;
while ((pathPart = strtok_r(tmp, "/", &tmp)))
{
RouteNode *tNode = HashMapGet(node->children, pathPart);
if (!tNode)
{
tNode = RouteNodeCreate(pathPart, NULL);
RouteNodeFree(HashMapSet(node->children, pathPart, tNode));
}
node = tNode;
}
node->exec = exec;
Free(regPath);
return 1;
}
int
HttpRouterRoute(HttpRouter * router, char *path, void *args, void **ret)
{
RouteNode *node;
char *pathPart;
char *tmp;
HttpRouteFunc *exec = NULL;
Array *matches;
size_t i;
int retval;
if (!router || !path)
{
return 0;
}
matches = ArrayCreate();
if (!matches)
{
return 0;
}
node = router->root;
if (StrEquals(path, "/"))
{
exec = node->exec;
}
else
{
path = StrDuplicate(path);
tmp = path;
while ((pathPart = strtok_r(tmp, "/", &tmp)))
{
char *key;
RouteNode *val = NULL;
regmatch_t pmatch[REG_MAX_SUB];
i = 0;
while (HashMapIterateReentrant(node->children, &key, (void **) &val, &i))
{
if (regexec(&val->regex, pathPart, REG_MAX_SUB, pmatch, 0) == 0)
{
break;
}
val = NULL;
}
if (!val)
{
exec = NULL;
break;
}
node = val;
exec = node->exec;
/* If we want to pass an arg, the match must be in parens */
if (val->regex.re_nsub)
{
/* pmatch[0] is the whole string, not the first
* subexpression */
for (i = 1; i < REG_MAX_SUB; i++)
{
if (pmatch[i].rm_so == -1)
{
break;
}
ArrayAdd(matches, StrSubstr(pathPart, pmatch[i].rm_so, pmatch[i].rm_eo));
}
}
}
Free(path);
}
if (!exec)
{
retval = 0;
goto finish;
}
if (ret)
{
*ret = exec(matches, args);
}
else
{
exec(matches, args);
}
retval = 1;
finish:
for (i = 0; i < ArraySize(matches); i++)
{
Free(ArrayGet(matches, i));
}
ArrayFree(matches);
return retval;
}