[PATCH v4 4/8] test-http-server: add HTTP error response function

["Matthew John Cheetham via GitGitGadget" <gitgitgadget@gmail.com>]

From: Matthew John Cheetham <mjcheetham@outlook.com>

Introduce a function to the test-http-server test helper to write more
full and valid HTTP error responses, including all the standard response
headers like `Server` and `Date`.

Signed-off-by: Matthew John Cheetham <mjcheetham@outlook.com>
---
 t/helper/test-http-server.c | 59 +++++++++++++++++++++++++++++++++----
 1 file changed, 53 insertions(+), 6 deletions(-)

diff --git a/t/helper/test-http-server.c b/t/helper/test-http-server.c
index 18f1f741305..53508639714 100644
--- a/t/helper/test-http-server.c
+++ b/t/helper/test-http-server.c
@@ -97,9 +97,59 @@ enum worker_result {
 	WR_STOP_THE_MUSIC = (WR_IO_ERROR | WR_HANGUP),
 };
 
+static enum worker_result send_http_error(
+	int fd,
+	int http_code, const char *http_code_name,
+	int retry_after_seconds, struct string_list *response_headers,
+	enum worker_result wr_in)
+{
+	struct strbuf response_header = STRBUF_INIT;
+	struct strbuf response_content = STRBUF_INIT;
+	struct string_list_item *h;
+	enum worker_result wr;
+
+	strbuf_addf(&response_content, "Error: %d %s\r\n",
+		    http_code, http_code_name);
+	if (retry_after_seconds > 0)
+		strbuf_addf(&response_content, "Retry-After: %d\r\n",
+			    retry_after_seconds);
+
+	strbuf_addf  (&response_header, "HTTP/1.1 %d %s\r\n", http_code, http_code_name);
+	strbuf_addstr(&response_header, "Cache-Control: private\r\n");
+	strbuf_addstr(&response_header,	"Content-Type: text/plain\r\n");
+	strbuf_addf  (&response_header,	"Content-Length: %d\r\n", (int)response_content.len);
+	if (retry_after_seconds > 0)
+		strbuf_addf(&response_header, "Retry-After: %d\r\n", retry_after_seconds);
+	strbuf_addf(  &response_header,	"Server: test-http-server/%s\r\n", git_version_string);
+	strbuf_addf(  &response_header, "Date: %s\r\n", show_date(time(NULL), 0, DATE_MODE(RFC2822)));
+	if (response_headers)
+		for_each_string_list_item(h, response_headers)
+			strbuf_addf(&response_header, "%s\r\n", h->string);
+	strbuf_addstr(&response_header, "\r\n");
+
+	if (write_in_full(fd, response_header.buf, response_header.len) < 0) {
+		logerror("unable to write response header");
+		wr = WR_IO_ERROR;
+		goto done;
+	}
+
+	if (write_in_full(fd, response_content.buf, response_content.len) < 0) {
+		logerror("unable to write response content body");
+		wr = WR_IO_ERROR;
+		goto done;
+	}
+
+	wr = wr_in;
+
+done:
+	strbuf_release(&response_header);
+	strbuf_release(&response_content);
+
+	return wr;
+}
+
 static enum worker_result worker(void)
 {
-	const char *response = "HTTP/1.1 501 Not Implemented\r\n";
 	char *client_addr = getenv("REMOTE_ADDR");
 	char *client_port = getenv("REMOTE_PORT");
 	enum worker_result wr = WR_OK;
@@ -110,11 +160,8 @@ static enum worker_result worker(void)
 	set_keep_alive(0);
 
 	while (1) {
-		if (write_in_full(1, response, strlen(response)) < 0) {
-			logerror("unable to write response");
-			wr = WR_IO_ERROR;
-		}
-
+		wr = send_http_error(1, 501, "Not Implemented", -1, NULL,
+			WR_OK | WR_HANGUP);
 		if (wr & WR_STOP_THE_MUSIC)
 			break;
 	}
-- 
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