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