1/* ui-blob.c: show blob content
  2 *
  3 * Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com>
  4 *
  5 * Licensed under GNU General Public License v2
  6 *   (see COPYING for full license text)
  7 */
  8
  9#include "cgit.h"
 10#include "ui-blob.h"
 11#include "html.h"
 12#include "ui-shared.h"
 13
 14struct walk_tree_context {
 15	const char *match_path;
 16	unsigned char *matched_sha1;
 17	unsigned int found_path:1;
 18	unsigned int file_only:1;
 19};
 20
 21static int walk_tree(const unsigned char *sha1, struct strbuf *base,
 22		const char *pathname, unsigned mode, int stage, void *cbdata)
 23{
 24	struct walk_tree_context *walk_tree_ctx = cbdata;
 25
 26	if (walk_tree_ctx->file_only && !S_ISREG(mode))
 27		return READ_TREE_RECURSIVE;
 28	if (strncmp(base->buf, walk_tree_ctx->match_path, base->len)
 29		|| strcmp(walk_tree_ctx->match_path + base->len, pathname))
 30		return READ_TREE_RECURSIVE;
 31	memmove(walk_tree_ctx->matched_sha1, sha1, 20);
 32	walk_tree_ctx->found_path = 1;
 33	return 0;
 34}
 35
 36int cgit_ref_path_exists(const char *path, const char *ref, int file_only)
 37{
 38	unsigned char sha1[20];
 39	unsigned long size;
 40	struct pathspec_item path_items = {
 41		.match = path,
 42		.len = strlen(path)
 43	};
 44	struct pathspec paths = {
 45		.nr = 1,
 46		.items = &path_items
 47	};
 48	struct walk_tree_context walk_tree_ctx = {
 49		.match_path = path,
 50		.matched_sha1 = sha1,
 51		.found_path = 0,
 52		.file_only = file_only
 53	};
 54
 55	if (get_sha1(ref, sha1))
 56		return 0;
 57	if (sha1_object_info(sha1, &size) != OBJ_COMMIT)
 58		return 0;
 59	read_tree_recursive(lookup_commit_reference(sha1)->tree, "", 0, 0, &paths, walk_tree, &walk_tree_ctx);
 60	return walk_tree_ctx.found_path;
 61}
 62
 63int cgit_print_file(char *path, const char *head, int file_only)
 64{
 65	unsigned char sha1[20];
 66	enum object_type type;
 67	char *buf;
 68	unsigned long size;
 69	struct commit *commit;
 70	struct pathspec_item path_items = {
 71		.match = path,
 72		.len = strlen(path)
 73	};
 74	struct pathspec paths = {
 75		.nr = 1,
 76		.items = &path_items
 77	};
 78	struct walk_tree_context walk_tree_ctx = {
 79		.match_path = path,
 80		.matched_sha1 = sha1,
 81		.found_path = 0,
 82		.file_only = file_only
 83	};
 84
 85	if (get_sha1(head, sha1))
 86		return -1;
 87	type = sha1_object_info(sha1, &size);
 88	if (type == OBJ_COMMIT) {
 89		commit = lookup_commit_reference(sha1);
 90		read_tree_recursive(commit->tree, "", 0, 0, &paths, walk_tree, &walk_tree_ctx);
 91		if (!walk_tree_ctx.found_path)
 92			return -1;
 93		type = sha1_object_info(sha1, &size);
 94	}
 95	if (type == OBJ_BAD)
 96		return -1;
 97	buf = read_sha1_file(sha1, &type, &size);
 98	if (!buf)
 99		return -1;
100	buf[size] = '\0';
101	html_raw(buf, size);
102	free(buf);
103	return 0;
104}
105
106void cgit_print_blob(const char *hex, char *path, const char *head, int file_only)
107{
108	unsigned char sha1[20];
109	enum object_type type;
110	char *buf;
111	unsigned long size;
112	struct commit *commit;
113	struct pathspec_item path_items = {
114		.match = path,
115		.len = path ? strlen(path) : 0
116	};
117	struct pathspec paths = {
118		.nr = 1,
119		.items = &path_items
120	};
121	struct walk_tree_context walk_tree_ctx = {
122		.match_path = path,
123		.matched_sha1 = sha1,
124		.found_path = 0,
125		.file_only = file_only
126	};
127
128	if (hex) {
129		if (get_sha1_hex(hex, sha1)) {
130			cgit_print_error_page(400, "Bad request",
131					"Bad hex value: %s", hex);
132			return;
133		}
134	} else {
135		if (get_sha1(head, sha1)) {
136			cgit_print_error_page(404, "Not found",
137					"Bad ref: %s", head);
138			return;
139		}
140	}
141
142	type = sha1_object_info(sha1, &size);
143
144	if ((!hex) && type == OBJ_COMMIT && path) {
145		commit = lookup_commit_reference(sha1);
146		read_tree_recursive(commit->tree, "", 0, 0, &paths, walk_tree, &walk_tree_ctx);
147		type = sha1_object_info(sha1,&size);
148	}
149
150	if (type == OBJ_BAD) {
151		cgit_print_error_page(404, "Not found",
152				"Bad object name: %s", hex);
153		return;
154	}
155
156	buf = read_sha1_file(sha1, &type, &size);
157	if (!buf) {
158		cgit_print_error_page(500, "Internal server error",
159				"Error reading object %s", hex);
160		return;
161	}
162
163	buf[size] = '\0';
164	if (buffer_is_binary(buf, size))
165		ctx.page.mimetype = "application/octet-stream";
166	else
167		ctx.page.mimetype = "text/plain";
168	ctx.page.filename = path;
169
170	html("X-Content-Type-Options: nosniff\n");
171	html("Content-Security-Policy: default-src 'none'\n");
172	cgit_print_http_headers();
173	html_raw(buf, size);
174	free(buf);
175}