feat(lander): serve content-disposition header

include/http/types.h

@@ -124,7 +124,8 @@ extern const char *http_header_names[];
 typedef enum http_header {
   http_header_connection = 0,
   http_header_location,
-  http_header_content_type
+  http_header_content_type,
+  http_header_content_disposition
 } http_header;
 
 typedef enum http_body_type {

src/http/http_consts.c

@@ -96,7 +96,8 @@ const char *http_status_names[][32] = {
 const char *http_header_names[] = {
   "Connection",
   "Location",
-  "Content-Type"
+  "Content-Type",
+  "Content-Disposition"
 };
 
 const char *http_mime_type_names[][2] = {

src/lander/lander_get.c

@@ -1,6 +1,7 @@
 #include <stdio.h>
 
 #include "event_loop.h"
+#include "http/res.h"
 #include "http/types.h"
 #include "lander.h"
 #include "log.h"
@@ -75,6 +76,21 @@ void lander_get_file(event_loop_conn *conn) {
   ctx->res.body.expected_len = lsm_entry_data_len(c_ctx->entry);
   lander_attr_to_header(ctx, lander_attr_type_content_type,
                         http_header_content_type);
+
+  lsm_str *value;
+  char *buf;
+
+  if (lsm_entry_attr_get(&value, c_ctx->entry, lander_attr_type_file_name) ==
+      lsm_error_ok) {
+    buf = malloc(24 + lsm_str_len(value));
+    int len = lsm_str_len(value);
+    sprintf(buf, "attachment; filename=\"%*s\"", len, lsm_str_ptr(value));
+  } else {
+    buf = malloc(11);
+    strcpy(buf, "attachment");
+  }
+
+  http_res_add_header(&ctx->res, http_header_content_disposition, buf, true);
 }
 
 bool lander_get_entry(event_loop_conn *conn) {