Add native JSON parser example

examples/json/.gitignore

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+*.o
+.objs
+json.so
+assets.h
+cert

examples/json/README.md

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+Native Kore JSON parser example.
+
+Run:
+```
+	$ kodev run
+```
+
+Test:
+```
+	$ curl -i -k -d '{"foo":{"bar": "Hello world"}}' https://127.0.0.1:8888
+```
+
+The result should echo back the foo.bar JSON path value if it is a JSON string.

examples/json/conf/build.conf

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+# json build config
+# You can switch flavors using: kodev flavor [newflavor]
+
+# The cflags below are shared between flavors
+cflags=-Wall -Wmissing-declarations -Wshadow
+cflags=-Wstrict-prototypes -Wmissing-prototypes
+cflags=-Wpointer-arith -Wcast-qual -Wsign-compare
+
+dev {
+	# These cflags are added to the shared ones when
+	# you build the "dev" flavor.
+	cflags=-g
+}
+
+#prod {
+#	You can specify additional CFLAGS here which are only
+#	included if you build with the "prod" flavor.
+#}

examples/json/conf/json.conf

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+# Placeholder configuration
+
+server tls {
+	bind 127.0.0.1 8888
+}
+
+load		./json.so
+
+tls_dhparam	dh2048.pem
+
+domain 127.0.0.1 {
+	attach		tls
+
+	certfile	cert/server.pem
+	certkey		cert/key.pem
+
+	static		/	page
+	restrict	/	post
+}

examples/json/src/json.c

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+/*
+ * Copyright (c) 2019 Joris Vink <joris@coders.se>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <kore/kore.h>
+#include <kore/http.h>
+
+int		page(struct http_request *);
+
+int
+page(struct http_request *req)
+{
+	struct kore_buf		buf;
+	struct kore_json	json;
+	struct kore_json_item	*item;
+
+	kore_buf_init(&buf, 128);
+	kore_json_init(&json, req->http_body->data, req->http_body->length);
+
+	if (!kore_json_parse(&json)) {
+		kore_buf_appendf(&buf, "%s\n", kore_json_strerror(&json));
+	} else {
+		if ((item = kore_json_string(&json, "foo/bar")) != NULL) {
+			kore_buf_appendf(&buf,
+			    "foo.bar = '%s'\n", item->data.string);
+		} else {
+			kore_buf_appendf(&buf, "%s\n",
+			    kore_json_strerror(&json));
+		}
+	}
+
+	http_response(req, 200, buf.data, buf.offset);
+
+	kore_buf_cleanup(&buf);
+	kore_json_cleanup(&json);
+
+	return (KORE_RESULT_OK);
+}