[PATCH 1/1] ui_plain: automatically lookup mimetype when mimetype-file is set

[Ferry Huberts]

From: Ferry Huberts <ferry.huberts at pelagic.nl>

Signed-off-by: Ferry Huberts <ferry.huberts at pelagic.nl>
---
 cgit.c       |    2 ++
 cgit.h       |    1 +
 cgitrc.5.txt |   10 ++++++++++
 ui-plain.c   |   41 ++++++++++++++++++++++++++++++++++++++---
 4 files changed, 51 insertions(+), 3 deletions(-)

diff --git a/cgit.c b/cgit.c
index b7807ad..abb698b 100644
--- a/cgit.c
+++ b/cgit.c
@@ -236,6 +236,8 @@ void config_cb(const char *name, const char *value)
 		ctx.cfg.ssdiff = atoi(value);
 	else if (!strcmp(name, "agefile"))
 		ctx.cfg.agefile = xstrdup(value);
+	else if (!strcmp(name, "mimetype-file"))
+		ctx.cfg.mimetype_file = xstrdup(value);
 	else if (!strcmp(name, "renamelimit"))
 		ctx.cfg.renamelimit = atoi(value);
 	else if (!strcmp(name, "remove-suffix"))
diff --git a/cgit.h b/cgit.h
index bad66f0..db24941 100644
--- a/cgit.h
+++ b/cgit.h
@@ -175,6 +175,7 @@ struct cgit_config {
 	char *index_info;
 	char *logo;
 	char *logo_link;
+	char *mimetype_file;
 	char *module_link;
 	char *project_list;
 	char *readme;
diff --git a/cgitrc.5.txt b/cgitrc.5.txt
index 4721c1e..3a3d1b6 100644
--- a/cgitrc.5.txt
+++ b/cgitrc.5.txt
@@ -222,6 +222,16 @@ max-stats::
 	"month", "quarter" and "year". If unspecified, statistics are
 	disabled. Default value: none. See also: "repo.max-stats".
 
+mimetype-file::
+	Specifies the file to use for automatic mimetype lookup. If specified
+	then this field takes precedence over "mimetype.<ext>". If unspecified
+	then no such lookup is performed. Default value: none.
+	See also: "mimetype.<ext>". The format of the file must comply to:
+	- a comment line is an empty line or a line starting hash (#) optional
+	  preceded by whitespace,
+	- a non-comment line starts with the mimetype (like image/png), followed
+	  by one or more file extensions, all separated by whitespace.
+
 mimetype.<ext>::
 	Set the mimetype for the specified filename extension. This is used
 	by the `plain` command when returning blob content.
diff --git a/ui-plain.c b/ui-plain.c
index 733db4d..7062733 100644
--- a/ui-plain.c
+++ b/ui-plain.c
@@ -6,6 +6,8 @@
  *   (see COPYING for full license text)
  */
 
+#include <stdio.h>
+#include <stdbool.h>
 #include "cgit.h"
 #include "html.h"
 #include "ui-shared.h"
@@ -13,12 +15,39 @@
 int match_baselen;
 int match;
 
+static char * getMimeFromFile(char *ext) {
+	static const char * delimiters = " \t\r\n";
+	char * result = NULL;
+	FILE * fd;
+	char line[1024];
+	char * mimetype;
+	char * token;
+
+	fd = fopen("/etc/mime.types", "r");
+	if (fd) {
+		while (fgets(line, sizeof(line), fd)) {
+			mimetype = strtok(line, delimiters);
+			if (mimetype && (mimetype[0] != '#')) {
+				while ((token = strtok(NULL, delimiters))) {
+					if (!strcasecmp(ext, token)) {
+						result = xstrdup(mimetype);
+						goto endloop;
+					}
+				}
+			}
+		}
+		endloop: fclose(fd);
+	}
+	return result;
+}
+
 static void print_object(const unsigned char *sha1, const char *path)
 {
 	enum object_type type;
 	char *buf, *ext;
 	unsigned long size;
 	struct string_list_item *mime;
+	bool freemime = false;
 
 	type = sha1_object_info(sha1, &size);
 	if (type == OBJ_BAD) {
@@ -34,9 +63,13 @@ static void print_object(const unsigned char *sha1, const char *path)
 	ctx.page.mimetype = NULL;
 	ext = strrchr(path, '.');
 	if (ext && *(++ext)) {
-		mime = string_list_lookup(&ctx.cfg.mimetypes, ext);
-		if (mime)
-			ctx.page.mimetype = (char *)mime->util;
+		if (ctx.cfg.mimetype_file && (ctx.page.mimetype = getMimeFromFile(ext))) {
+			freemime = true;
+		} else {
+			mime = string_list_lookup(&ctx.cfg.mimetypes, ext);
+			if (mime)
+				ctx.page.mimetype = (char *)mime->util;
+		}
 	}
 	if (!ctx.page.mimetype) {
 		if (buffer_is_binary(buf, size))
@@ -50,6 +83,8 @@ static void print_object(const unsigned char *sha1, const char *path)
 	cgit_print_http_headers(&ctx);
 	html_raw(buf, size);
 	match = 1;
+	if (freemime)
+		free(ctx.page.mimetype);
 }
 
 static char *buildpath(const char *base, int baselen, const char *path)
-- 
1.7.5.4