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,
 60			    repo_get_commit_tree(the_repository, lookup_commit_reference(the_repository, &oid)),
 61			    "", 0, 0, &paths, walk_tree, &walk_tree_ctx);
 62
 63done:
 64	free(path_items.match);
 65	return walk_tree_ctx.found_path;
 66}
 67
 68int cgit_print_file(char *path, const char *head, int file_only)
 69{
 70	struct object_id oid;
 71	enum object_type type;
 72	char *buf;
 73	unsigned long size;
 74	struct commit *commit;
 75	struct pathspec_item path_items = {
 76		.match = path,
 77		.len = strlen(path)
 78	};
 79	struct pathspec paths = {
 80		.nr = 1,
 81		.items = &path_items
 82	};
 83	struct walk_tree_context walk_tree_ctx = {
 84		.match_path = path,
 85		.matched_oid = &oid,
 86		.found_path = 0,
 87		.file_only = file_only
 88	};
 89
 90	if (get_oid(head, &oid))
 91		return -1;
 92	type = oid_object_info(the_repository, &oid, &size);
 93	if (type == OBJ_COMMIT) {
 94		commit = lookup_commit_reference(the_repository, &oid);
 95		read_tree_recursive(the_repository,
 96				    repo_get_commit_tree(the_repository, commit),
 97				    "", 0, 0, &paths, walk_tree,
 98				    &walk_tree_ctx);
 99		if (!walk_tree_ctx.found_path)
100			return -1;
101		type = oid_object_info(the_repository, &oid, &size);
102	}
103	if (type == OBJ_BAD)
104		return -1;
105	buf = read_object_file(&oid, &type, &size);
106	if (!buf)
107		return -1;
108	buf[size] = '\0';
109	html_raw(buf, size);
110	free(buf);
111	return 0;
112}
113
114void cgit_print_blob(const char *hex, char *path, const char *head, int file_only)
115{
116	struct object_id oid;
117	enum object_type type;
118	char *buf;
119	unsigned long size;
120	struct commit *commit;
121	struct pathspec_item path_items = {
122		.match = path,
123		.len = path ? strlen(path) : 0
124	};
125	struct pathspec paths = {
126		.nr = 1,
127		.items = &path_items
128	};
129	struct walk_tree_context walk_tree_ctx = {
130		.match_path = path,
131		.matched_oid = &oid,
132		.found_path = 0,
133		.file_only = file_only
134	};
135
136	if (hex) {
137		if (get_oid_hex(hex, &oid)) {
138			cgit_print_error_page(400, "Bad request",
139					"Bad hex value: %s", hex);
140			return;
141		}
142	} else {
143		if (get_oid(head, &oid)) {
144			cgit_print_error_page(404, "Not found",
145					"Bad ref: %s", head);
146			return;
147		}
148	}
149
150	type = oid_object_info(the_repository, &oid, &size);
151
152	if ((!hex) && type == OBJ_COMMIT && path) {
153		commit = lookup_commit_reference(the_repository, &oid);
154		read_tree_recursive(the_repository,
155				    repo_get_commit_tree(the_repository, commit),
156				    "", 0, 0, &paths, walk_tree,
157				    &walk_tree_ctx);
158		type = oid_object_info(the_repository, &oid, &size);
159	}
160
161	if (type == OBJ_BAD) {
162		cgit_print_error_page(404, "Not found",
163				"Bad object name: %s", hex);
164		return;
165	}
166
167	buf = read_object_file(&oid, &type, &size);
168	if (!buf) {
169		cgit_print_error_page(500, "Internal server error",
170				"Error reading object %s", hex);
171		return;
172	}
173
174	buf[size] = '\0';
175	if (buffer_is_binary(buf, size))
176		ctx.page.mimetype = "application/octet-stream";
177	else
178		ctx.page.mimetype = "text/plain";
179	ctx.page.filename = path;
180
181	html("X-Content-Type-Options: nosniff\n");
182	html("Content-Security-Policy: default-src 'none'\n");
183	cgit_print_http_headers();
184	html_raw(buf, size);
185	free(buf);
186}