Now how index is built, can be determined here

1 files changed, 24 insertions, 5 deletions

diff --git a/main.c b/main.c
index 97be7a1..f4e9a40 100644
--- a/main.c
+++ b/main.c
@@ -1,21 +1,40 @@
-#include <string.h>
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <unistd.h>
 #include <shopify.h>
 
+static char *html(const char *host)
+{
+	static const char *path_rel = "/frontend/index.html";
+	char path[strlen(APP_DIR) + strlen(path_rel) + 1];
+	sprintf(path, "%s%s", APP_DIR, path_rel);
+	int fd = open(path, O_RDONLY);
+	struct stat sb;
+	fstat(fd, &sb);
+	char template[sb.st_size + 1];
+	read(fd, path, sb.st_size);
+	close(fd);
+	const size_t html_len = sb.st_size - strlen("%s") * 4 + strlen(API_KEY)
+		+ strlen(host) + strlen(APP_URL) * 2;
+	char *html = malloc(html_len + 1);
+	sprintf(html, template, API_KEY, host, APP_URL, APP_URL);
+	return html;
+}
+
 int main(int argc, char *argv[])
 {
 	const size_t app_dir_len = strlen(APP_DIR);
 	static const char *scopes_rel = "/shopify.app.toml";
 	char scopes[app_dir_len + strlen(scopes_rel) + 1];
 	sprintf(scopes, "%s%s", APP_DIR, scopes_rel);
-	static const char *index_rel = "/frontend/index.html";
-	char index[app_dir_len + strlen(index_rel) + 1];
-	sprintf(index, "%s%s", APP_DIR, index_rel);
 	static const char *js_dir_rel = "/frontend/build";
 	char js_dir[app_dir_len + strlen(js_dir_rel) + 1];
 	sprintf(js_dir, "%s%s", APP_DIR, js_dir_rel);
 	shopify_app(API_KEY, API_SECRET_KEY, APP_URL, "/auth", APP_ID, scopes,
-			index, js_dir, (struct shopify_api[]){
+			html, js_dir, (struct shopify_api[]){
 			{
 				"/products",
 				"GET",