Add an example that parses JSON via yajl

examples/json_yajl/.gitignore

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

examples/json_yajl/README.md

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+This example demonstrates how you can use external libs in your application.
+
+In this case we link against yajl (Yet Another JSON library) in order to
+parse a JSON string that was POSTed to the server.
+
+Run:
+```
+	env KORE_LDFLAGS="-lyajl" kore 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: Hello world.

examples/json_yajl/conf/json_yajl.conf

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+# Placeholder configuration
+
+bind		127.0.0.1 8888
+pidfile		kore.pid
+ssl_no_compression
+load		./json_yajl.so
+
+domain 127.0.0.1 {
+	certfile	cert/server.crt
+	certkey		cert/server.key
+
+	static	/	page
+}

examples/json_yajl/src/json_yajl.c

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+#include <kore/kore.h>
+#include <kore/http.h>
+
+#include <yajl/yajl_tree.h>
+
+int		page(struct http_request *);
+
+int
+page(struct http_request *req)
+{
+	struct kore_buf		*buf;
+	char			*body;
+	yajl_val		node, v;
+	char			eb[1024];
+	const char		*path[] = { "foo", "bar", NULL };
+
+	/* We only allow POST methods. */
+	if (req->method != HTTP_METHOD_POST) {
+		http_response(req, 400, NULL, 0);
+		return (KORE_RESULT_OK);
+	}
+
+	/*
+	 * Grab the entire body we received as text (NUL-terminated).
+	 * Note: this can return NULL and the result MUST be freed.
+	 */
+	if ((body = http_post_data_text(req)) == NULL) {
+		http_response(req, 400, NULL, 0);
+		return (KORE_RESULT_OK);
+	}
+
+	/* Parse the body via yajl now. */
+	node = yajl_tree_parse(body, eb, sizeof(eb));
+	if (node == NULL) {
+		if (strlen(eb)) {
+			kore_log(LOG_NOTICE, "parse error: %s", eb);
+		} else {
+			kore_log(LOG_NOTICE, "parse error: unknown");
+		}
+
+		kore_mem_free(body);
+		http_response(req, 400, NULL, 0);
+		return (KORE_RESULT_OK);
+	}
+
+	buf = kore_buf_create(128);
+
+	/* Attempt to grab foo.bar from the JSON tree. */
+	v = yajl_tree_get(node, path, yajl_t_string);
+	if (v == NULL) {
+		kore_buf_appendf(buf, "no such path: foo.bar\n");
+	} else {
+		kore_buf_appendf(buf, "foo.bar = '%s'\n", YAJL_GET_STRING(v));
+	}
+
+	/* Release the JSON tree now. */
+	yajl_tree_free(node);
+	kore_mem_free(body);
+
+	/* Respond to the client. */
+	http_response(req, 200, buf->data, buf->offset);
+	kore_buf_free(buf);
+
+	return (KORE_RESULT_OK);
+}