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// (c) Copyright 2016 Hewlett Packard Enterprise Development LP
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package gosec
import "go/ast"
func resolveIdent(n *ast.Ident, c *Context) bool {
if n.Obj == nil || n.Obj.Kind != ast.Var {
return true
}
if node, ok := n.Obj.Decl.(ast.Node); ok {
return TryResolve(node, c)
}
return false
}
func resolveAssign(n *ast.AssignStmt, c *Context) bool {
for _, arg := range n.Rhs {
if !TryResolve(arg, c) {
return false
}
}
return true
}
func resolveCompLit(n *ast.CompositeLit, c *Context) bool {
for _, arg := range n.Elts {
if !TryResolve(arg, c) {
return false
}
}
return true
}
func resolveBinExpr(n *ast.BinaryExpr, c *Context) bool {
return (TryResolve(n.X, c) && TryResolve(n.Y, c))
}
func resolveCallExpr(n *ast.CallExpr, c *Context) bool {
// TODO(tkelsey): next step, full function resolution
return false
}
// TryResolve will attempt, given a subtree starting at some ATS node, to resolve
// all values contained within to a known constant. It is used to check for any
// unknown values in compound expressions.
func TryResolve(n ast.Node, c *Context) bool {
switch node := n.(type) {
case *ast.BasicLit:
return true
case *ast.CompositeLit:
return resolveCompLit(node, c)
case *ast.Ident:
return resolveIdent(node, c)
case *ast.AssignStmt:
return resolveAssign(node, c)
case *ast.CallExpr:
return resolveCallExpr(node, c)
case *ast.BinaryExpr:
return resolveBinExpr(node, c)
}
return false
}
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