Add support for HTTP relative redirects.

source/core/http.c

@@ -26,6 +26,35 @@ struct http_context_s {
     u32 bufferSize;
 };
 
+void http_resolve_redirect(char* oldUrl, const char* redirectTo, size_t size) {
+    if(size > 0) {
+        if(redirectTo[0] == '/') {
+            char* baseEnd = oldUrl;
+
+            // Find the third slash to find the end of the URL's base; e.g. https://www.example.com/
+            u32 slashCount = 0;
+            while(*baseEnd != '\0' && (baseEnd = strchr(baseEnd + 1, '/')) != NULL) {
+                slashCount++;
+                if(slashCount == 3) {
+                    break;
+                }
+            }
+
+            // If there are less than 3 slashes, assume the base URL ends at the end of the string; e.g. https://www.example.com
+            if(slashCount != 3) {
+                baseEnd = oldUrl + strlen(oldUrl);
+            }
+
+            size_t baseLen = baseEnd - oldUrl;
+            if(baseLen < size) {
+                string_copy(baseEnd, redirectTo, size - baseLen);
+            }
+        } else {
+            string_copy(oldUrl, redirectTo, size);
+        }
+    }
+}
+
 Result http_open(http_context* context, const char* url, bool userAgent) {
     return http_open_ranged(context, url, userAgent, 0, 0);
 }
@@ -64,9 +93,12 @@ Result http_open_ranged(http_context* context, const char* url, bool userAgent,
                     if(response == 301 || response == 302 || response == 303) {
                         redirectCount++;
 
-                        memset(currUrl, '\0', sizeof(currUrl));
+                        char redirectTo[1024];
-                        if(R_SUCCEEDED(res = httpcGetResponseHeader(&ctx->httpc, "Location", currUrl, sizeof(currUrl)))) {
+                        memset(redirectTo, '\0', sizeof(redirectTo));
+                        if(R_SUCCEEDED(res = httpcGetResponseHeader(&ctx->httpc, "Location", redirectTo, sizeof(redirectTo)))) {
                             httpcCloseContext(&ctx->httpc);
+
+                            http_resolve_redirect(currUrl, redirectTo, sizeof(currUrl));
                         }
                     } else {
                         resolved = true;