1/* ui-blob.c: show blob content
  2 *
  3 * Copyright (C) 2008 Lars Hjemli
  4 * Copyright (C) 2010 Jason A. Donenfeld <Jason@zx2c4.com>
  5 *
  6 * Licensed under GNU General Public License v2
  7 *   (see COPYING for full license text)
  8 */
  9
 10#include "cgit.h"
 11#include "ui-blob.h"
 12#include "html.h"
 13#include "ui-shared.h"
 14
 15struct walk_tree_context {
 16	const char *match_path;
 17	unsigned char *matched_sha1;
 18	int found_path;
 19};
 20
 21static int walk_tree(const unsigned char *sha1, const char *base, int baselen,
 22	const char *pathname, unsigned mode, int stage, void *cbdata)
 23{
 24	struct walk_tree_context *walk_tree_ctx = cbdata;
 25
 26	if (strncmp(base, walk_tree_ctx->match_path, baselen)
 27		|| strcmp(walk_tree_ctx->match_path + baselen, pathname))
 28		return READ_TREE_RECURSIVE;
 29	memmove(walk_tree_ctx->matched_sha1, sha1, 20);
 30	walk_tree_ctx->found_path = 1;
 31	return 0;
 32}
 33
 34int cgit_ref_path_exists(const char *path, const char *ref)
 35{
 36        unsigned char sha1[20];
 37        unsigned long size;
 38        struct pathspec_item path_items = {
 39                .match = path,
 40                .len = strlen(path)
 41        };
 42        struct pathspec paths = {
 43                .nr = 1,
 44                .items = &path_items
 45        };
 46        struct walk_tree_context walk_tree_ctx = {
 47                .match_path = path,
 48                .matched_sha1 = sha1,
 49                .found_path = 0
 50        };
 51
 52        if (get_sha1(ref, sha1))
 53                return 0;
 54        if (sha1_object_info(sha1, &size) != OBJ_COMMIT) 
 55                return 0;
 56        read_tree_recursive(lookup_commit_reference(sha1)->tree, "", 0, 0, &paths, walk_tree, &walk_tree_ctx);
 57        return walk_tree_ctx.found_path;
 58}
 59
 60int cgit_print_file(char *path, const char *head)
 61{
 62	unsigned char sha1[20];
 63	enum object_type type;
 64	char *buf;
 65	unsigned long size;
 66	struct commit *commit;
 67	struct pathspec_item path_items = {
 68		.match = path,
 69		.len = strlen(path)
 70	};
 71	struct pathspec paths = {
 72		.nr = 1,
 73		.items = &path_items
 74	};
 75	struct walk_tree_context walk_tree_ctx = {
 76		.match_path = path,
 77		.matched_sha1 = sha1,
 78		.found_path = 0
 79	};
 80
 81	if (get_sha1(head, sha1))
 82		return -1;
 83	type = sha1_object_info(sha1, &size);
 84	if (type == OBJ_COMMIT && path) {
 85		commit = lookup_commit_reference(sha1);
 86		read_tree_recursive(commit->tree, "", 0, 0, &paths, walk_tree, &walk_tree_ctx);
 87		if (!walk_tree_ctx.found_path)
 88			return -1;
 89		type = sha1_object_info(sha1, &size);
 90	}
 91	if (type == OBJ_BAD)
 92		return -1;
 93	buf = read_sha1_file(sha1, &type, &size);
 94	if (!buf)
 95		return -1;
 96	buf[size] = '\0';
 97	html_raw(buf, size);
 98	return 0;
 99}
100
101void cgit_print_blob(const char *hex, char *path, const char *head)
102{
103	unsigned char sha1[20];
104	enum object_type type;
105	char *buf;
106	unsigned long size;
107	struct commit *commit;
108	struct pathspec_item path_items = {
109		.match = path,
110		.len = path ? strlen(path) : 0
111	};
112	struct pathspec paths = {
113		.nr = 1,
114		.items = &path_items
115	};
116	struct walk_tree_context walk_tree_ctx = {
117		.match_path = path,
118		.matched_sha1 = sha1,
119	};
120
121	if (hex) {
122		if (get_sha1_hex(hex, sha1)) {
123			cgit_print_error("Bad hex value: %s", hex);
124			return;
125		}
126	} else {
127		if (get_sha1(head, sha1)) {
128			cgit_print_error("Bad ref: %s", head);
129			return;
130		}
131	}
132
133	type = sha1_object_info(sha1, &size);
134
135	if ((!hex) && type == OBJ_COMMIT && path) {
136		commit = lookup_commit_reference(sha1);
137		read_tree_recursive(commit->tree, "", 0, 0, &paths, walk_tree, &walk_tree_ctx);
138		type = sha1_object_info(sha1,&size);
139	}
140
141	if (type == OBJ_BAD) {
142		cgit_print_error("Bad object name: %s", hex);
143		return;
144	}
145
146	buf = read_sha1_file(sha1, &type, &size);
147	if (!buf) {
148		cgit_print_error("Error reading object %s", hex);
149		return;
150	}
151
152	buf[size] = '\0';
153	ctx.page.mimetype = ctx.qry.mimetype;
154	if (!ctx.page.mimetype) {
155		if (buffer_is_binary(buf, size))
156			ctx.page.mimetype = "application/octet-stream";
157		else
158			ctx.page.mimetype = "text/plain";
159	}
160	ctx.page.filename = path;
161	cgit_print_http_headers(&ctx);
162	html_raw(buf, size);
163}