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 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	hashcpy(walk_tree_ctx->matched_oid->hash, sha1);
 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 (sha1_object_info(oid.hash, &size) != OBJ_COMMIT)
 58		goto done;
 59	read_tree_recursive(lookup_commit_reference(&oid)->tree, "", 0, 0, &paths, walk_tree, &walk_tree_ctx);
 60
 61done:
 62	free(path_items.match);
 63	return walk_tree_ctx.found_path;
 64}
 65
 66int cgit_print_file(char *path, const char *head, int file_only)
 67{
 68	struct object_id oid;
 69	enum object_type type;
 70	char *buf;
 71	unsigned long size;
 72	struct commit *commit;
 73	struct pathspec_item path_items = {
 74		.match = path,
 75		.len = strlen(path)
 76	};
 77	struct pathspec paths = {
 78		.nr = 1,
 79		.items = &path_items
 80	};
 81	struct walk_tree_context walk_tree_ctx = {
 82		.match_path = path,
 83		.matched_oid = &oid,
 84		.found_path = 0,
 85		.file_only = file_only
 86	};
 87
 88	if (get_oid(head, &oid))
 89		return -1;
 90	type = sha1_object_info(oid.hash, &size);
 91	if (type == OBJ_COMMIT) {
 92		commit = lookup_commit_reference(&oid);
 93		read_tree_recursive(commit->tree, "", 0, 0, &paths, walk_tree, &walk_tree_ctx);
 94		if (!walk_tree_ctx.found_path)
 95			return -1;
 96		type = sha1_object_info(oid.hash, &size);
 97	}
 98	if (type == OBJ_BAD)
 99		return -1;
100	buf = read_sha1_file(oid.hash, &type, &size);
101	if (!buf)
102		return -1;
103	buf[size] = '\0';
104	html_raw(buf, size);
105	free(buf);
106	return 0;
107}
108
109void cgit_print_blob(const char *hex, char *path, const char *head, int file_only)
110{
111	struct object_id oid;
112	enum object_type type;
113	char *buf;
114	unsigned long size;
115	struct commit *commit;
116	struct pathspec_item path_items = {
117		.match = path,
118		.len = path ? strlen(path) : 0
119	};
120	struct pathspec paths = {
121		.nr = 1,
122		.items = &path_items
123	};
124	struct walk_tree_context walk_tree_ctx = {
125		.match_path = path,
126		.matched_oid = &oid,
127		.found_path = 0,
128		.file_only = file_only
129	};
130
131	if (hex) {
132		if (get_oid_hex(hex, &oid)) {
133			cgit_print_error_page(400, "Bad request",
134					"Bad hex value: %s", hex);
135			return;
136		}
137	} else {
138		if (get_oid(head, &oid)) {
139			cgit_print_error_page(404, "Not found",
140					"Bad ref: %s", head);
141			return;
142		}
143	}
144
145	type = sha1_object_info(oid.hash, &size);
146
147	if ((!hex) && type == OBJ_COMMIT && path) {
148		commit = lookup_commit_reference(&oid);
149		read_tree_recursive(commit->tree, "", 0, 0, &paths, walk_tree, &walk_tree_ctx);
150		type = sha1_object_info(oid.hash, &size);
151	}
152
153	if (type == OBJ_BAD) {
154		cgit_print_error_page(404, "Not found",
155				"Bad object name: %s", hex);
156		return;
157	}
158
159	buf = read_sha1_file(oid.hash, &type, &size);
160	if (!buf) {
161		cgit_print_error_page(500, "Internal server error",
162				"Error reading object %s", hex);
163		return;
164	}
165
166	buf[size] = '\0';
167	if (buffer_is_binary(buf, size))
168		ctx.page.mimetype = "application/octet-stream";
169	else
170		ctx.page.mimetype = "text/plain";
171	ctx.page.filename = path;
172
173	html("X-Content-Type-Options: nosniff\n");
174	html("Content-Security-Policy: default-src 'none'\n");
175	cgit_print_http_headers();
176	html_raw(buf, size);
177	free(buf);
178}