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108 lines
3 KiB
Go
108 lines
3 KiB
Go
// (c) Copyright 2016 Hewlett Packard Enterprise Development LP
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package gas
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import (
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"encoding/json"
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"fmt"
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"go/ast"
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"os"
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)
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// Score type used by severity and confidence values
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type Score int
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const (
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Low Score = iota // Low value
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Medium // Medium value
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High // High value
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)
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// An Issue is returnd by a GAS rule if it discovers an issue with the scanned code.
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type Issue struct {
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Severity Score `json:"severity"` // issue severity (how problematic it is)
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Confidence Score `json:"confidence"` // issue confidence (how sure we are we found it)
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What string `json:"details"` // Human readable explanation
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File string `json:"file"` // File name we found it in
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Code string `json:"code"` // Impacted code line
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Line int `json:"line"` // Line number in file
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}
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// MetaData is embedded in all GAS rules. The Severity, Confidence and What message
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// will be passed tbhrough to reported issues.
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type MetaData struct {
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Severity Score
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Confidence Score
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What string
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}
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// MarshalJSON is used convert a Score object into a JSON representation
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func (c Score) MarshalJSON() ([]byte, error) {
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return json.Marshal(c.String())
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}
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// String converts a Score into a string
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func (c Score) String() string {
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switch c {
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case High:
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return "HIGH"
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case Medium:
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return "MEDIUM"
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case Low:
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return "LOW"
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}
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return "UNDEFINED"
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}
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func codeSnippet(file *os.File, start int64, end int64, n ast.Node) (string, error) {
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if n == nil {
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return "", fmt.Errorf("Invalid AST node provided")
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}
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size := (int)(end - start) // Go bug, os.File.Read should return int64 ...
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file.Seek(start, 0)
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buf := make([]byte, size)
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if nread, err := file.Read(buf); err != nil || nread != size {
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return "", fmt.Errorf("Unable to read code")
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}
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return string(buf), nil
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}
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// NewIssue creates a new Issue
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func NewIssue(ctx *Context, node ast.Node, desc string, severity Score, confidence Score) *Issue {
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var code string
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fobj := ctx.FileSet.File(node.Pos())
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name := fobj.Name()
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line := fobj.Line(node.Pos())
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if file, err := os.Open(fobj.Name()); err == nil {
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defer file.Close()
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s := (int64)(fobj.Position(node.Pos()).Offset) // Go bug, should be int64
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e := (int64)(fobj.Position(node.End()).Offset) // Go bug, should be int64
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code, err = codeSnippet(file, s, e, node)
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if err != nil {
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code = err.Error()
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}
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}
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return &Issue{
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File: name,
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Line: line,
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What: desc,
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Confidence: confidence,
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Severity: severity,
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Code: code,
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}
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}
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