merge(third_party/cgit): Import at master of 2020-01-11

Imported commit '723dc8fbcb' as
'third_party/cgit'.

third_party/cgit/ui-blob.c

@@ -0,0 +1,181 @@
+/* ui-blob.c: show blob content
+ *
+ * Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com>
+ *
+ * Licensed under GNU General Public License v2
+ *   (see COPYING for full license text)
+ */
+
+#include "cgit.h"
+#include "ui-blob.h"
+#include "html.h"
+#include "ui-shared.h"
+
+struct walk_tree_context {
+	const char *match_path;
+	struct object_id *matched_oid;
+	unsigned int found_path:1;
+	unsigned int file_only:1;
+};
+
+static int walk_tree(const struct object_id *oid, struct strbuf *base,
+		const char *pathname, unsigned mode, int stage, void *cbdata)
+{
+	struct walk_tree_context *walk_tree_ctx = cbdata;
+
+	if (walk_tree_ctx->file_only && !S_ISREG(mode))
+		return READ_TREE_RECURSIVE;
+	if (strncmp(base->buf, walk_tree_ctx->match_path, base->len)
+		|| strcmp(walk_tree_ctx->match_path + base->len, pathname))
+		return READ_TREE_RECURSIVE;
+	oidcpy(walk_tree_ctx->matched_oid, oid);
+	walk_tree_ctx->found_path = 1;
+	return 0;
+}
+
+int cgit_ref_path_exists(const char *path, const char *ref, int file_only)
+{
+	struct object_id oid;
+	unsigned long size;
+	struct pathspec_item path_items = {
+		.match = xstrdup(path),
+		.len = strlen(path)
+	};
+	struct pathspec paths = {
+		.nr = 1,
+		.items = &path_items
+	};
+	struct walk_tree_context walk_tree_ctx = {
+		.match_path = path,
+		.matched_oid = &oid,
+		.found_path = 0,
+		.file_only = file_only
+	};
+
+	if (get_oid(ref, &oid))
+		goto done;
+	if (oid_object_info(the_repository, &oid, &size) != OBJ_COMMIT)
+		goto done;
+	read_tree_recursive(the_repository, lookup_commit_reference(the_repository, &oid)->maybe_tree,
+		"", 0, 0, &paths, walk_tree, &walk_tree_ctx);
+
+done:
+	free(path_items.match);
+	return walk_tree_ctx.found_path;
+}
+
+int cgit_print_file(char *path, const char *head, int file_only)
+{
+	struct object_id oid;
+	enum object_type type;
+	char *buf;
+	unsigned long size;
+	struct commit *commit;
+	struct pathspec_item path_items = {
+		.match = path,
+		.len = strlen(path)
+	};
+	struct pathspec paths = {
+		.nr = 1,
+		.items = &path_items
+	};
+	struct walk_tree_context walk_tree_ctx = {
+		.match_path = path,
+		.matched_oid = &oid,
+		.found_path = 0,
+		.file_only = file_only
+	};
+
+	if (get_oid(head, &oid))
+		return -1;
+	type = oid_object_info(the_repository, &oid, &size);
+	if (type == OBJ_COMMIT) {
+		commit = lookup_commit_reference(the_repository, &oid);
+		read_tree_recursive(the_repository, commit->maybe_tree,
+			"", 0, 0, &paths, walk_tree, &walk_tree_ctx);
+		if (!walk_tree_ctx.found_path)
+			return -1;
+		type = oid_object_info(the_repository, &oid, &size);
+	}
+	if (type == OBJ_BAD)
+		return -1;
+	buf = read_object_file(&oid, &type, &size);
+	if (!buf)
+		return -1;
+	buf[size] = '\0';
+	html_raw(buf, size);
+	free(buf);
+	return 0;
+}
+
+void cgit_print_blob(const char *hex, char *path, const char *head, int file_only)
+{
+	struct object_id oid;
+	enum object_type type;
+	char *buf;
+	unsigned long size;
+	struct commit *commit;
+	struct pathspec_item path_items = {
+		.match = path,
+		.len = path ? strlen(path) : 0
+	};
+	struct pathspec paths = {
+		.nr = 1,
+		.items = &path_items
+	};
+	struct walk_tree_context walk_tree_ctx = {
+		.match_path = path,
+		.matched_oid = &oid,
+		.found_path = 0,
+		.file_only = file_only
+	};
+
+	if (hex) {
+		if (get_oid_hex(hex, &oid)) {
+			cgit_print_error_page(400, "Bad request",
+					"Bad hex value: %s", hex);
+			return;
+		}
+	} else {
+		if (get_oid(head, &oid)) {
+			cgit_print_error_page(404, "Not found",
+					"Bad ref: %s", head);
+			return;
+		}
+	}
+
+	type = oid_object_info(the_repository, &oid, &size);
+
+	if ((!hex) && type == OBJ_COMMIT && path) {
+		commit = lookup_commit_reference(the_repository, &oid);
+		read_tree_recursive(the_repository, commit->maybe_tree,
+			"", 0, 0, &paths, walk_tree, &walk_tree_ctx);
+		type = oid_object_info(the_repository, &oid, &size);
+	}
+
+	if (type == OBJ_BAD) {
+		cgit_print_error_page(404, "Not found",
+				"Bad object name: %s", hex);
+		return;
+	}
+
+	buf = read_object_file(&oid, &type, &size);
+	if (!buf) {
+		cgit_print_error_page(500, "Internal server error",
+				"Error reading object %s", hex);
+		return;
+	}
+
+	buf[size] = '\0';
+	if (buffer_is_binary(buf, size))
+		ctx.page.mimetype = "application/octet-stream";
+	else
+		ctx.page.mimetype = "text/plain";
+	ctx.page.filename = path;
+
+	html("X-Content-Type-Options: nosniff\n");
+	html("Content-Security-Policy: default-src 'none'\n");
+	cgit_print_http_headers();
+	html_raw(buf, size);
+	free(buf);
+}