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	struct object_id *matched_oid;
 17	unsigned int found_path:1;
 18	unsigned int file_only:1;
 19};
 20
 21static int walk_tree(const struct object_id *oid, 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	oidcpy(walk_tree_ctx->matched_oid, oid);
 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	struct object_id oid;
 39	unsigned long size;
 40	struct pathspec_item path_items = {
 41		.match = xstrdup(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_oid = &oid,
 51		.found_path = 0,
 52		.file_only = file_only
 53	};
 54
 55	if (get_oid(ref, &oid))
 56		goto done;
 57	if (oid_object_info(the_repository, &oid, &size) != OBJ_COMMIT)
 58		goto done;
 59	read_tree_recursive(the_repository, lookup_commit_reference(the_repository, &oid)->maybe_tree,
 60		"", 0, 0, &paths, walk_tree, &walk_tree_ctx);
 61
 62done:
 63	free(path_items.match);
 64	return walk_tree_ctx.found_path;
 65}
 66
 67int cgit_print_file(char *path, const char *head, int file_only)
 68{
 69	struct object_id oid;
 70	enum object_type type;
 71	char *buf;
 72	unsigned long size;
 73	struct commit *commit;
 74	struct pathspec_item path_items = {
 75		.match = path,
 76		.len = strlen(path)
 77	};
 78	struct pathspec paths = {
 79		.nr = 1,
 80		.items = &path_items
 81	};
 82	struct walk_tree_context walk_tree_ctx = {
 83		.match_path = path,
 84		.matched_oid = &oid,
 85		.found_path = 0,
 86		.file_only = file_only
 87	};
 88
 89	if (get_oid(head, &oid))
 90		return -1;
 91	type = oid_object_info(the_repository, &oid, &size);
 92	if (type == OBJ_COMMIT) {
 93		commit = lookup_commit_reference(the_repository, &oid);
 94		read_tree_recursive(the_repository, commit->maybe_tree,
 95			"", 0, 0, &paths, walk_tree, &walk_tree_ctx);
 96		if (!walk_tree_ctx.found_path)
 97			return -1;
 98		type = oid_object_info(the_repository, &oid, &size);
 99	}
100	if (type == OBJ_BAD)
101		return -1;
102	buf = read_object_file(&oid, &type, &size);
103	if (!buf)
104		return -1;
105	buf[size] = '\0';
106	html_raw(buf, size);
107	free(buf);
108	return 0;
109}
110
111void cgit_print_blob(const char *hex, char *path, const char *head, int file_only)
112{
113	struct object_id oid;
114	enum object_type type;
115	char *buf;
116	unsigned long size;
117	struct commit *commit;
118	struct pathspec_item path_items = {
119		.match = path,
120		.len = path ? strlen(path) : 0
121	};
122	struct pathspec paths = {
123		.nr = 1,
124		.items = &path_items
125	};
126	struct walk_tree_context walk_tree_ctx = {
127		.match_path = path,
128		.matched_oid = &oid,
129		.found_path = 0,
130		.file_only = file_only
131	};
132
133	if (hex) {
134		if (get_oid_hex(hex, &oid)) {
135			cgit_print_error_page(400, "Bad request",
136					"Bad hex value: %s", hex);
137			return;
138		}
139	} else {
140		if (get_oid(head, &oid)) {
141			cgit_print_error_page(404, "Not found",
142					"Bad ref: %s", head);
143			return;
144		}
145	}
146
147	type = oid_object_info(the_repository, &oid, &size);
148
149	if ((!hex) && type == OBJ_COMMIT && path) {
150		commit = lookup_commit_reference(the_repository, &oid);
151		read_tree_recursive(the_repository, commit->maybe_tree,
152			"", 0, 0, &paths, walk_tree, &walk_tree_ctx);
153		type = oid_object_info(the_repository, &oid, &size);
154	}
155
156	if (type == OBJ_BAD) {
157		cgit_print_error_page(404, "Not found",
158				"Bad object name: %s", hex);
159		return;
160	}
161
162	buf = read_object_file(&oid, &type, &size);
163	if (!buf) {
164		cgit_print_error_page(500, "Internal server error",
165				"Error reading object %s", hex);
166		return;
167	}
168
169	buf[size] = '\0';
170	if (buffer_is_binary(buf, size))
171		ctx.page.mimetype = "application/octet-stream";
172	else
173		ctx.page.mimetype = "text/plain";
174	ctx.page.filename = path;
175
176	html("X-Content-Type-Options: nosniff\n");
177	html("Content-Security-Policy: default-src 'none'\n");
178	cgit_print_http_headers();
179	html_raw(buf, size);
180	free(buf);
181}