download files

1 files changed, 73 insertions, 26 deletions

diff --git a/download.c b/download.c
index f506466..af490e1 100644
--- a/download.c
+++ b/download.c
@@ -33,6 +33,8 @@
 
 #include <fcntl.h>
 #include <limits.h>
+#include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 
 #include "cgi.h"
@@ -63,7 +65,7 @@ build_download_url(struct kreq * r, struct file * file)
 			   "download: action URL overflow: %s", action_url);
 		return 0;
 	}
-	file->action_url = v_strcpy(action_url, action_url_len);
+	file->action_url = strndup(action_url, action_url_len);
 	if (file->action_url == NULL) {
 		kutil_warn(r, NULL,
 			   "download: unable to allocate file url buffer: %s",
@@ -73,50 +75,95 @@ build_download_url(struct kreq * r, struct file * file)
 	return action_url_len;
 }
 
+static char *
+strsplit(char * str, char c) {
+	char	*right, *result;
+	size_t	right_len;
+
+	right = strrchr(str, c);
+	if(!right || right == str)
+		return NULL;
+
+	// move right part to new buffer
+	right_len = strlen(right);
+	result = malloc(sizeof(char) * right_len);
+	if(result == NULL)
+		return NULL;
+
+	if(strlcpy(result, right + 1, right_len) >= right_len) {
+		free(result);
+		return NULL;
+	}
+
+	// remove right part from src buffer
+	*right = '\0';
+
+	return result;
+}
+
 void
 download(struct kreq * r)
 {
+	char   *file_name;
 	void   *buffer;
-	struct stat st;
-	int 	st_ret, fd;
-	char 	file_path[PATH_MAX];
+	struct file* f;
+	int	fd;
+	char 	file_path[PATH_MAX], request_path[PATH_MAX];
 	size_t 	path_size;
 
 	/* check that the requested URL can be safely processed */
-	if (!check_request_path(r->path))
-		http_exit(r, KHTTP_400, "download: Invalid request path");
+	if (strlen(r->path) == 0 || !check_request_path(r->path, r->suffix))
+		http_exit(r, KHTTP_400, "download: invalid request path");
 
 	/* build requested file path */
-	path_size = url_build(file_path, PATH_MAX, DATA_DIR, r->path,
+	if(strlen(r->suffix) > 0) {
+		/* request with suffix */
+		if(snprintf(request_path, sizeof(request_path), "%s.%s", r->path, r->suffix)
+				>= (int) sizeof(request_path))
+			http_exit(r, KHTTP_414, NULL);
+	}
+	else {
+		if(snprintf(request_path, sizeof(request_path), "%s", r->path) >= (int) sizeof(request_path))
+			http_exit(r, KHTTP_414, NULL);
+	}
+
+	path_size = url_build(file_path, PATH_MAX, DATA_DIR, request_path,
 			      NULL);
 	if (path_size == 0)
-		http_exit(r, KHTTP_404, "download: Unable to build file path");
+		http_exit(r, KHTTP_404, "download: unable to build file path");
 	if (path_size >= PATH_MAX)
 		http_exit(r, KHTTP_414, NULL);
 
-	/* check that it is a file */
-
+	/* build file metadata */
+	file_name = strsplit(request_path, '/');
+	if(file_name == NULL)
+		f = file_new("/", 1, request_path, strlen(request_path)); /* ROOT file */
+	else {
+		f = file_new(request_path, strlen(request_path), file_name,
+				strlen(file_name));
+		free(file_name); /* copied in file_new */
+	}
+	if(f == NULL)
+		http_exit(r, KHTTP_404, "download: file metadata failure");
 
 	/* memory map the file */
 	fd = open(file_path, O_RDONLY);
-	if (fd < 0)
-		http_exit(r, KHTTP_404, "download: Unable to open file");
-	st_ret = fstat(fd, &st);
-	if (st_ret != 0)
-		http_exit(r, KHTTP_404, "download: Unable to open file");
-
-	/* TODO mmap does not work with empty file: st_size = 0 */
-	buffer = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
-	if (buffer == MAP_FAILED)
-		http_exit(r, KHTTP_500, "download: mmap failed");
+	if(fd < 0)
+		http_exit(r, KHTTP_404, "download: unable to open file");
+	/* mmap does not work with empty file: st_size = 0 */
+	if(f->size > 0) {
+		buffer = mmap(NULL, f->size, PROT_READ, MAP_PRIVATE, fd, 0);
+		if (buffer == MAP_FAILED)
+			http_exit(r, KHTTP_500, "download: mmap failed");
+	}
 
 	/* write the file */
-	/* TODO proper filename & MIME type detection */
-	K_OK(khttp_head(r, kresps[KRESP_CONTENT_DISPOSITION], "attachment; filename=\"File.txt\""), r);
-	http_open(r, KHTTP_200, KMIME_TEXT_PLAIN);
-	K_OK(khttp_write(r, (const char *) buffer, st.st_size), r);
+	http_open_file(r, KHTTP_200, f);
+	if(f->size > 0)
+		K_OK(khttp_write(r, (const char *) buffer, f->size), r);
 
 	/* cleanup */
-	munmap(buffer, st.st_size);
-	close(fd);
+	if(f->size > 0)
+		munmap(buffer, f->size);
+	free(f);
 }